al Pursuing A Professional Certification In Scrum By feedproxy.google.com Published On :: Wed, 22 Apr 2020 08:00:00 -0400 Professional certifications have become increasingly popular in this age of career switchers and the freelance gig economy. A certification can be a useful way to advance your skill set quickly or make your resume stand out, which can be especially important for those trying to break into a new industry or attract business while self-employed. Whatever your reason may be for pursuing a professional certificate, there is one question only you can answer for yourself: is it worth it? Finding first-hand experiences from professionals with similar career goals and passions was the most helpful research I used to answer that question for myself. So, here’s mine; why I decided to get Scrum certified, how I evaluated my options, and if it was really worth it. A shift in mindset My background originates in brand strategy where it’s typical for work to follow a predictable order, each step informing the next. This made linear techniques like water-fall timelines, completing one phase of work in its entirety before moving onto the next, and documenting granular tasks weeks in advance helpful and easy to implement. When I made the move to more digitally focused work, tasks followed a much looser set of ‘typical’ milestones. While the general outline remained the same (strategy, design, development, launch) there was a lot more overlap with how tasks informed each other, and would keep informing and re-informing as an iterative workflow would encourage. Trying to fit a very fluid process into my very stiff linear approach to project planning didn’t work so well. I didn’t have the right strategies to manage risks in a productive way without feeling like the whole project was off track; with the habit of account for granular details all the time, I struggled to lean on others to help define what we should work on and when, and being okay if that changed once, or twice, or three times. Everything I learned about the process of product development came from learning on the job and making a ton of mistakes—and I knew I wanted to get better. Photo by Christin Hume on Unsplash I was fortunate enough to work with a group of developers who were looking to make a change, too. Being ‘agile’-enthusiasts, this group of developers were desperately looking for ways to infuse our approach to product work with agile-minded principles (the broad definition of ‘agile’ comes from ‘The Agile Manifesto’, which has influenced frameworks for organizing people and information, often applied in product development). This not only applied to how I worked with them, but how they worked with each other, and the way we all onboarded clients to these new expectations. This was a huge eye opener to me. Soon enough, I started applying these agile strategies to my day-to-day— running stand-ups, setting up backlogs, and reorganizing the way I thought about work output. It’s from this experience that I decided it may be worth learning these principles more formally. The choice to get certified There is a lot of literature out there about agile methodologies and a lot to be learned from casual research. This benefitted me for a while until I started to work on more complicated projects, or projects with more ambitious feature requests. My decision to ultimately pursue a formal agile certification really came down to three things: An increased use of agile methods across my team. Within my day-to-day I would encounter more team members who were familiar with these tactics and wanted to use them to structure the projects they worked on.The need for a clear definition of what processes to follow. I needed to grasp a real understanding of how to implement agile processes and stay consistent with using them to be an effective champion of these principles.Being able to diversify my experience. Finding ways to differentiate my resume from others with similar experience would be an added benefit to getting a certification. If nothing else, it would demonstrate that I’m curious-minded and proactive about my career. To achieve these things, I gravitated towards a more foundational education in a specific agile-methodology. This made Scrum the most logical choice given it’s the basis for many of the agile strategies out there and its dominance in the field. Evaluating all the options For Scrum education and certification, there are really two major players to consider. Scrum Alliance - Probably the most well known Scrum organization is Scrum Alliance. They are a highly recognizable organization that does a lot to further the broader understanding of Scrum as a practice.Scrum.org - Led by the original co-founder of Scrum, Ken Schwaber, Scrum.org is well-respected and touted for its authority in the industry. Each has their own approach to teaching and awarding certifications as well as differences in price point and course style that are important to be aware of. SCRUM ALLIANCE Pros Strong name recognition and leaders in the Scrum fieldOffers both in-person and online coursesHosts in-person events, webinars, and global conferencesProvides robust amounts of educational resources for its membersHas specialization tracks for folks looking to apply Scrum to their specific disciplineMembers are required to keep their skills up to date by earning educational credits throughout the year to retain their certificationConsistent information across all course administrators ensuring you'll be set up to succeed when taking your certification test. Cons High cost creates a significant barrier to entry (we’re talking in the thousands of dollars here)Courses are required to take the certification testCertification expires after two years, requiring additional investment in time and/or money to retain credentialsDifficult to find sample course material ahead of committing to a courseCourses are several days long which may mean taking time away from a day job to complete them SCRUM.ORG Pros Strong clout due to its founder, Ken Schwaber, who is the originator of ScrumOffers in-person classes and self-paced optionsHosts in-person events and meetups around the worldProvides free resources and materials to the public, including practice testsHas specialization tracks for folks looking to apply Scrum to their specific disciplineMinimum score on certification test required to pass; certification lasts for lifeLower cost for certification when compared to peers Cons Much lesser known to the general public, as compared to its counterpartLess sophisticated educational resources (mostly confined to PDFs or online forums) making digesting the material challengingPractice tests are slightly out of date making them less effective as a study toolSelf-paced education is not structured and therefore can’t ensure you’re learning everything you need to know for the testLack of active and engaging community will leave something to be desired Before coming to a decision, it was helpful to me to weigh these pros and cons against a set of criteria. Here’s a helpful scorecard I used to compare the two institutions. Scrum Alliance Scrum.org Affordability ⚪⚪⚪⚪ Rigor⚪⚪⚪⚪⚪ Reputation⚪⚪⚪⚪⚪ Recognition⚪⚪⚪⚪ Community⚪⚪⚪⚪ Access⚪⚪⚪⚪⚪ Flexibility⚪⚪⚪⚪ Specialization⚪⚪⚪⚪⚪⚪ Requirements⚪⚪⚪⚪ Longevity⚪⚪⚪⚪ For me, the four areas that were most important to me were: Affordability - I’d be self-funding this certificate so the investment of cost would need to be manageable.Self-paced - Not having a lot of time to devote in one sitting, the ability to chip away at coursework was appealing to me.Reputation - Having a certificate backed by a well-respected institution was important to me if I was going to put in the time to achieve this credential.Access - Because I wanted to be a champion for this framework for others in my organization, having access to resources and materials would help me do that more effectively. Ultimately, I decided upon a Professional Scrum Master certification from Scrum.org! The price and flexibility of learning course content were most important to me. I found a ton of free materials on Scrum.org that I could study myself and their practice tests gave me a good idea of how well I was progressing before I committed to the cost of actually taking the test. And, the pedigree of certification felt comparable to that of Scrum Alliance, especially considering that the founder of Scrum himself ran the organization. Putting a certificate to good use I don’t work in a formal Agile company, and not everyone I work with knows the ins and outs of Scrum. I didn’t use my certification to leverage a career change or new job title. So after all that time, money, and energy, was it worth it?I think so. I feel like I use my certification every day and employ many of the principles of Scrum in my day-to-day management of projects and people. Self-organizing teams is really important when fostering trust and collaboration among project members. This means leaning on each other’s past experiences and lessons learned to inform our own approach to work. It also means taking a step back as a project manager to recognize the strengths on your team and trust their lead.Approaching things in bite size pieces is also a best practice I use every day. Even when there isn't a mandated sprint rhythm, breaking things down into effort level, goals, and requirements is an excellent way to approach work confidently and avoid getting too overwhelmed.Retrospectives and stand ups are also absolute musts for Scrum practices, and these can be modified to work for companies and project teams of all shapes and sizes. Keeping a practice of collective communication and reflection will keep a team humming and provides a safe space to vent and improve. Photo by Gautam Lakum on Unsplash Parting advice I think furthering your understanding of industry standards and keeping yourself open to new ways of working will always benefit you as a professional. Professional certifications are readily available and may be more relevant than ever. If you’re on this path, good luck! And here are some things to consider: Do your research – With so many educational institutions out there, you can definitely find the right one for you, with the level of rigor you’re looking for.Look for company credits or incentives – some companies cover part or all of the cost for continuing education.Get started ASAP – You don’t need a full certification to start implementing small tactics to your workflows. Implementing learnings gradually will help you determine if it’s really something you want to pursue more formally. Full Article News & Culture Project Management
al A Parent’s Guide to Working From Home, During a Global Pandemic, Without Going Insane By feedproxy.google.com Published On :: Thu, 30 Apr 2020 15:06:00 -0400 Though I usually enjoy working from Viget’s lovely Boulder office, during quarantine I am now working from home while simultaneously parenting my 3-year-old daughter Audrey. My husband works in healthcare and though he is not on the front lines battling COVID-19, he is still an essential worker and as such leaves our home to work every day. Some working/parenting days are great! I somehow get my tasks accomplished, my kid is happy, and we spend some quality time together. And some days are awful. I have to ignore my daughter having a meltdown and try to focus on meetings, and I wish I wasn’t in this situation at all. Most days are somewhere in the middle; I’m just doing my best to get by. I’ve seen enough working parent memes and cries for help on social media to know that I’m not alone. There are many parents out there who now get to experience the stress and anxiety of living through a global pandemic while simultaneously navigating ways to stay productive while working from home and being an effective parent. Fun isn’t it? I’m not an expert on the matter, but I have found a few small things that are making me feel a bit more sane. I hope sharing them will make someone else’s life easier too. Truths to Accept First, let’s acknowledge some truths about this new situation we find ourselves in: Truth 1: We’ve lost something. Parents have lost more than daycare and schools during this epidemic. We’ve lost any time that we had for ourselves, and that was really valuable. We no longer have small moments in the day to catch up on our personal lives. I no longer have a commute to separate my work duties from my mom duties, or catch up with my friends, or just be quiet. Truth 2: We’re human. The reason you can’t be a great employee and a great parent and a great friend and a great partner or spouse all day every day isn’t because you’re doing a bad job, it’s because being constantly wonderful in all aspects of your life is impossible. Pick one or two of those things a day to focus on. Truth 3: We’re all doing our best. This is the most important part of this article. Be kind to yourselves. This isn’t easy, and putting so much pressure on yourself that you break isn’t going to make it any easier. Work from Home Goals Now that we’ve accepted some truths about our current situation, let’s set some goals. Goal 1: Do Good Work At Viget, and wherever you work, with kids or without we all want to make sure that the quality of our work stays up throughout the pandemic and that we can continue to be reliable team members and employees to the best of our abilities. Goal 2: Stay Sane We need to figure out ways to do this without sacrificing ourselves entirely. For me, this means fitting my work into normal work hours as much as possible so that I can still have some downtime in the evenings. Goal 3: Make This Sustainable None of us knows how long this will last but we may as well begin mentally preparing for a long haul. Work from Home Rules Now, there are some great Work from Home Rules that apply to everyone with or without kids. My coworker Paul Koch shared these with the Viget team a Jeremy Bearimy ago and I agree this is also the foundation for working from home with kids. When you’re in a remote meeting, minimize other windows to stay focusedSet a schedule and avoid chores*Take breaks away from the screenPlan your workday on the calendar+Be mindful of Slack and social media as a distractionUse timers+Keep your work area separate from where you relaxPretend that you’re still WFWExperiment and figure out what works for you In the improv spirit I say “Yes, AND….” to these tips. And so, here are my adjusted rules for WFH while kiddos around: These have both been really solid tools for me, so let’s dig in. Daily flexible schedule for kids Day Planning: Calendars and Timers A few small tweaks and adjustments make this even more doable for me and my 3-year-old. First- I don’t avoid chores entirely. If I’m going up and down the stairs all day anyway I might as well throw in a load of laundry while I’m at it. The more I can get done during the day means a greater chance of some down time in the evening. Each morning I plan my day and Audrey’s day: My Work Day:Audrey's DayIdentify times of day you are more likely to be focus and protect them. For me, I know I have a block of time from 5-7a before Audrey wakes up and again during “nap time” from 1-3p.I built a construction paper “schedule” that we update and reorganize daily. We make the schedule together each day. She feels ownership over it and she gets to be the one who tells me what we do next.Look at your calendar first thing and make adjustments either in your plans or move meetings if you have to.I’m strategic about screen time- I try to schedule it when I have meetings. It also helps to schedule a physical activity before screen time as she is less likely to get bored.Make goals for your day: Tackle time sensitive tasks first. Take care of things that either your co-workers or clients are waiting on from you first, this will help your day be a lot less stressful. Non-time sensitive tasks come next- these can be done at any time of day.We always include “nap time” even though she rarely naps anymore. This is mostly a time for us both to be alone. When we make the schedule together it also helps me understand her favorite parts of the day and reminds me to include them. Once our days are planned, I also use timers to help keep the structure of the day. (I bought a great alarm clock for kids on Amazon that turns colors to signal bedtime and quiet time. It’s been hugely worth it for me.) Timers for Me:Timers for Audrey:More than ever, I rely on a time tracking timer. At Viget we use Harvest to track time, and it has a handy built in timer, but there are many apps or online tools that could help you keep track of your time as well.Audrey knows what time she can come out of her room in the morning. If she wakes up before the light is green she plays quietly in her room.I need a timer because the days and hours are bleeding together- without tracking as I go it would be really hard for me to remember when I worked on certain projects or know for certain if I gave Viget enough time for the day.She knows how long “nap time” is in the afternoon.Starting and stopping the timer helps me turn on and off “work mode”, which is a helpful sanity bonus.Perhaps best of all I am not the bad guy! “Sorry honey, the light isn’t green yet and there really isn’t anything mommy can do about it” is my new favorite way to ensure we both get some quiet time. Work from Home Rules: Updated for Parents Finally, I have a few more Work from Home Rules for parents to add to the list: Minimize other windows in remote meetingsSet a schedule and fit in some chores if time allowsTake breaks away from the screenSchedule both your and your kids’ daysBe mindful of Slack and social media as a distractionUse timers to track your own time and help your kids understand the dayKeep your work area separate from where you relaxPretend that you’re still WFWExperiment and figure out what works for youBe prepared with a few activitiesEach morning, have just ONE thing ready to go. This can be a worksheet you printed out, a coloring station setup, a new bag of kinetic sand you just got delivered from Amazon, a kids dance video on YouTube or an iPad game. Recently I started enlisting my mom to read stories on Facetime. The activity doesn’t have to be new each day but (especially for young kids) it has to be handy for you to start up quickly if your schedule changesClearly communicate your availability with your team and project PMsLife happens. Some days are going to be hard. Whatever you do, don’t burn yourself out or leave your team hanging. If you need to move a meeting or take a day off, communicate that as early and as clearly as you can.Take PTO if you canNone of us are superheroes. If you’re feeling overwhelmed- take a look at the next few days and figure out which one makes the most sense for you to take a break.Take breaks to be alone without doing a taskWork and family responsibilities have blended together, there’s almost no room for being alone. If you can find some precious alone time don’t use it to fold laundry or clean the bathroom. Just zone out. I think we all really need this. Last but not least, enjoy your time at home if you can. This is an unusual circumstance and even though it’s really hard, there are parts that are really great too. If you have some great WFH tips we’d love to hear about them in the comments! Full Article Process News & Culture
al Global Gitignore Files Are Cool and So Are You By feedproxy.google.com Published On :: Wed, 06 May 2020 08:00:00 -0400 Setting it up First, here's the config setup you need to even allow for such a radical concept. Define the global gitignore file as a global Git configuration: git config --global core.excludesfile ~/.gitignore If you're on OSX, this command will add the following config lines in your ~/.gitconfig file. [core] excludesfile = /Users/triplegirldad/.gitignore Load that ~/.gitignore file up with whatever you want. It probably doesn't exist as a file yet so you might have to create it first. Harnessing its incredible power There are only two lines in my global gitignore file and they are both fairly useful pretty much all the time. $ cat ~/.gitignore TODO.md playground This 2 line file means that no matter where I am, what project I'm working on, where in the project I'm doing so, I have an easy space to stash notes, thoughts, in progress ideas, spikes, etc. TODO.md More often than not, I'm fiddling around with a TODO.md file. Something about writing markdown in your familiar text editor speaks to my soul. It's quick, it's easy, you have all the text editing tricks available to you, and it never does anything you wouldn't expect (looking at you auto-markdown-formatting editors). I use one or two # for headings, I use nested lists, and I ask for nothing more. Nothing more than more TODO.md files that is! In practice I tend to just have one TODO.md file per project, right at the top, ready to pull up in a few keystrokes. Which I do often. I pull this doc up if: I'm in a meeting and I just said "oh yeah that's a small thing, I'll knock it out this afternoon". I'm halfway through some feature development and realize I want to make a sweeping refactor elsewhere. Toss some thoughts in the doc, and then get back to the task at hand. It's the end of the day and I have to switch my brain into "feed small children" mode, thus obliterating everything work-related from my short term memory. When I open things up the next day and know exactly what the next thing to dive into was. I'm preparing for a big enough refactor and I can't hold it all in my brain at once. What I'd give to have an interactive 3D playground for brain thoughts, but in the meantime a 2D text file isn't a terrible way to plan out dev work. playground Sometimes you need more than some human words in a markdown file to move an idea along. This is where my playground directory comes in. I can load this directory up with code that's related to a given project and keep it out of the git history. Because who doesn't like a place to play around. I find that this directory is more useful for long running maintenance projects over fast moving greenfield ones. On the maintenance projects, I tend to find myself assembling a pile of scripts and experiments for various situations: The client requests a one-time obscure data export. Whip up some CSV generation code and save that code in the playground directory. The client requests a different obscure data export. Pull up the last time you did something vaguely similar and save yourself the startup time. A batch of data needs to be imported just once. Might as well stash that in the chance that "just once" is actually "just a few times". Kicking the tires on an integration with a third party service. Some of these playground files end up being useful more times than I can count (eg: the ever-changing user_export.rb script). Some items get promoted into application code, which is always fun. But most files here serve their purpose and then wither away. And that's fine. It's a playground, anything goes. Wrapping up Having a personal space for project-specific notes and code has been helpful to me over the years as a developer on multiple projects. If you have your own organizational trick, or just want to brag about how you memorize everything without any markdown files, let me know in the comments below! Full Article Code
al 10 Cool & Free Mobile Wallpapers By feedproxy.google.com Published On :: Wed, 26 Jul 2017 11:03:04 +0000 Guys, great news! Our friends at Freepik has released exclusively for s2o readers 10 Cool & Free Mobile Wallpapers in several awesome styles. They come in AI, EPS and jpg files. The wallpapers are easily resizable for any kind of mobile —or any other project ;)— so you can adapt them in a no time … 10 Cool & Free Mobile Wallpapers Read More » Full Article Freebies
al Building Your Website All Alone By feedproxy.google.com Published On :: Sun, 31 Dec 2017 18:22:23 +0000 Whether you have created a brand new company, or you’ve been around for a long time, if you do not already have a website, you are going to have to put one up as soon as humanly possible. According to the website Mashable, online shopping accounted for $231 billion in sales in 2012. This means … Building Your Website All Alone Read More » Full Article Reference
al New Gallery: Winterlichter Palmengarten Jan 2016 By feedproxy.google.com Published On :: Tue, 19 Jan 2016 20:44:39 +0000 Winterlichter Palmengarten Jan 2016 Full Article Uncategorized Changing Perspectives IFTTT
al Winterlichter Palmengarten Dec. 2019 By feedproxy.google.com Published On :: Sat, 28 Dec 2019 12:27:57 +0000 Full Article
al Exploring Node.js Internals By feedproxy.google.com Published On :: Thu, 23 Apr 2020 10:30:00 +0000 Since the introduction of Node.js by Ryan Dahl at the European JSConf on 8 November 2009, it has seen wide usage across the tech industry. Companies such as Netflix, Uber, and LinkedIn give credibility to the claim that Node.js can withstand a high amount of traffic and concurrency. Armed with basic knowledge, beginner and intermediate developers of Node.js struggle with many things: “It’s just a runtime!” “It has event loops! Full Article
al Brighten Up Someone’s May (2020 Wallpapers Edition) By feedproxy.google.com Published On :: Thu, 30 Apr 2020 07:20:00 +0000 May is here! And even though the current situation makes this a different kind of May, with a new routine and different things on our minds as in the years before, luckily some things never change. Like the fact that we start into the new month with some fresh inspiration. Since more than nine years already, we challenge you, the design community, to get creative and produce wallpaper designs for our monthly posts. Full Article
al Readability Algorithms Should Be Tools, Not Targets By feedproxy.google.com Published On :: Fri, 01 May 2020 11:30:00 +0000 The web is awash with words. They’re everywhere. On websites, in emails, advertisements, tweets, pop-ups, you name it. More people are publishing more copy than at any point in history. That means a lot of information, and a lot of competition. In recent years a slew of ‘readability’ programs have appeared to help us tidy up the things we write. (Grammarly, Readable, and Yoast are just a handful that come to mind. Full Article
al A Complete Guide To Mechanical Keyboards By feedproxy.google.com Published On :: Wed, 06 May 2020 10:30:00 +0000 About six years ago, a colleague I’ll call Tom, because that’s his name, forwarded me a link to the ‘WASD CODE’; a keyboard focused on the needs of programmers, designed with the help of Stack Overflow’s Jeff Atwood. I had no idea at the time that there were people actually dedicating themselves to creating keyboards beyond the stock fare shipping with computers. As I read and re-read the blurb, I was smitten. Full Article
al Photography Life makes all their paid premium courses free By feedproxy.google.com Published On :: Fri, 08 May 2020 09:10:59 +0000 Photography Life has just contributed to the selection of online courses that you can take for free. While their premim courses are normally paid $150 per course, you can now access them free of charge. The founders have released them on YouTube, available for everyone to watch. The Photography Life team came to the decision […] The post Photography Life makes all their paid premium courses free appeared first on DIY Photography. Full Article news Course free class online courses Photography Life
al Watch YouTube’s most informed sock puppet teach you how to shoot with manual exposure By feedproxy.google.com Published On :: Fri, 08 May 2020 17:29:41 +0000 For those who’ve never seen TheCrafsMan SteadyCraftin on YouTube, you’re in for a treat – even if you already understand everything contained within this 25-minute video. For those who have, you know exactly what to expect. I’ve been following this rather unconventional channel for a while now. It covers a lot of handy DIY and […] The post Watch YouTube’s most informed sock puppet teach you how to shoot with manual exposure appeared first on DIY Photography. Full Article Tutorials exposure Exposure Triangle photography basics SteadyCraftin TheCraftsMan
al C’était le calme avant la tempête… By feedproxy.google.com Published On :: Fri, 13 Mar 2020 20:44:36 +0000 St-Donat, Bas-St-Laurent, Québec Full Article aérienne Hiver Paysage St-Donat hiver rural village
al Ça va bien aller! By feedproxy.google.com Published On :: Tue, 24 Mar 2020 23:40:30 +0000 St-Donat, Bas-St-Laurent, Québec Full Article aérienne Paysage Printemps St-Donat printemps rural village
al Matin calme à St-Donat By feedproxy.google.com Published On :: Tue, 31 Mar 2020 22:36:52 +0000 St-Donat, Bas-St-Laurent, Québec Full Article aérienne Paysage Printemps St-Donat neige printemps village
al La vallée de la Neigette By feedproxy.google.com Published On :: Mon, 27 Apr 2020 22:00:06 +0000 St-Donat, Bas-St-Laurent, Québec Full Article aérienne Paysage Printemps St-Donat calme printemps vallée
al eagereyesTV Episode 2: Unit Charts, Dot Plots, ISOTYPE, and What Makes Them Special By eagereyes.org Published On :: Wed, 09 Oct 2019 07:17:21 +0000 Charts usually show values as visual properties, like the length in a bar chart, the location in a scatterplot, the area in a bubble chart, etc. Unit charts show values as multiples instead. One famous example of these charts is called ISOTYPE, and you may have seen them in information graphics as well. They’re an […] Full Article Blog 2019 eagereyesTV
al Paper: Evidence for Area as the Primary Visual Cue in Pie Charts By eagereyes.org Published On :: Thu, 17 Oct 2019 15:52:12 +0000 How we read pie charts is still an open question: is it angle? Is it area? Is it arc length? In a study I'm presenting as a short paper at the IEEE VIS conference in Vancouver next week, I tried to tease the visual cues apart – using modeling and 3D pie charts. The big […] Full Article Blog 2019 paper pie charts
al Prolific, the (Much Better) Mechnical Turk Alternative By eagereyes.org Published On :: Tue, 05 Nov 2019 07:17:08 +0000 Prolific is a crowd-sourcing platform for running studies. In contrast to the widely-used Mechanical Turk, it’s specific to studies, has a much better interface, pricing that’s fair to participants, and useful filters to find the right people for your study. Amazon's Mechanical Turk is used for many empirical studies published in the visualization literature, but […] Full Article Blog 2019
al Review: Alberto Cairo, How Charts Lie By eagereyes.org Published On :: Tue, 12 Nov 2019 05:07:05 +0000 Alberto Cairo’s new book, How Charts Lie, takes readers on a tour of how charts are used and misused, and teaches them how to not be misled. It’s a useful book for both makers and consumers of charts, in the news, business, and pretty much anywhere else. When Alberto started talking about the title on […] Full Article Blog 2019 Book Reviews
al ISOTYPE Book: Young, Prager, There’s Work for All By eagereyes.org Published On :: Mon, 02 Dec 2019 01:54:26 +0000 This book from 1945 contains a very interesting mix of different charts made by the ISOTYPE Institute, some classic and some quite unusual. As a book about labor and unemployment, it also makes extensive use of Gerd Arntz’s famous unemployed man icon. Michael Young and Theodor Prager’s There’s Work for All is part of a […] Full Article ISOTYPE Books isotype
al The Visual Evolution of the “Flattening the Curve” Information Graphic By eagereyes.org Published On :: Mon, 16 Mar 2020 04:10:24 +0000 Communication has been quite a challenge during the COVID-19 pandemic, and data visualization hasn't been the most helpful given the low quality of the data – see Amanda Makulec's plea to think harder about making another coronavirus chart. A great example of how to do things right is the widely-circulated Flatten the Curve information graphic/cartoon. […] Full Article Blog 2020 COVID-19 Visual Communication
al In Praise of the Diagonal Reference Line By eagereyes.org Published On :: Tue, 24 Mar 2020 05:51:19 +0000 Annotations are what set visual communication and journalism apart from just visualization. They often consist of text, but some of the most useful annotations are graphical elements, and many of them are very simple. One type I have a particular fondness for is the diagonal reference line, which has been used to provide powerful context […] Full Article Blog 2020 COVID-19 Visual Communication
al Half Time Picks *** Sunday *** 17 September 2017 By dataviz.tumblr.com Published On :: Sat, 16 Sep 2017 19:14:31 -0400 We have a new preview on https://www.007soccerpicks.com/sunday-matches/half-time-picks-sunday-17-september-2017/Half Time Picks *** Sunday *** 17 September 2017 HALF TIME PICKS To return: ??? USD Odds: 7.43 Stake: 100 USD Starting in Teams Half Time Our Pick Odds Alaves - Villarreal Soccer: Spain - LaLiga HALF TIME X 2.01 Zenit Petersburg - Ufa Soccer: Russia -… Full Article halftime picks and tips halftime predictions HALF TIME RESULT Sunday Matches
al Goals Scored Picks *** Sunday *** 17 September 2017 By dataviz.tumblr.com Published On :: Sat, 16 Sep 2017 19:14:54 -0400 We have a new preview on https://www.007soccerpicks.com/sunday-matches/goals-scored-picks-sunday-17-september-2017/Goals Scored Picks *** Sunday *** 17 September 2017 MATCH GOALS PICKS To return: ??? USD Odds: 6.44 Stake: 100 USD Starting in Teams Our Prediction Odds Amiens - Marseille Soccer: France - Ligue 1 UNDER 2.5 1.85 AC Milan - Udinese Soccer: Italy - Serie A… Full Article over 2.5 goals tips under 2.5 goals tips MATCH GOALS Sunday Matches
al Goals Scored Picks *** Monday *** 18 September 2017 By dataviz.tumblr.com Published On :: Sun, 17 Sep 2017 19:06:27 -0400 We have a new preview on https://www.007soccerpicks.com/monday-matches/goals-scored-picks-monday-18-september-2017/Goals Scored Picks *** Monday *** 18 September 2017 MATCH GOALS PICKS To return: ??? USD Odds: 4.56 Stake: 100 USD Starting in Teams Our Prediction Odds Astra - FC Viitorul Soccer: Romania - Liga 1 UNDER 2.5 1.60 Espanyol - Celta Vigo Soccer: Spain - LaLiga… Full Article over 2.5 goals tips under 2.5 goals tips MATCH GOALS Monday Matches
al Half Time Picks *** Monday *** 18 September 2017 By dataviz.tumblr.com Published On :: Sun, 17 Sep 2017 19:07:40 -0400 We have a new preview on https://www.007soccerpicks.com/monday-matches/half-time-picks-monday-18-september-2017/Half Time Picks *** Monday *** 18 September 2017 HALF TIME PICKS To return: ??? USD Odds: 8.39 Stake: 100 USD Starting in Teams Half Time Our Pick Odds Espanyol - Celta Vigo Soccer: Spain - LaLiga HALF TIME X 2.07 Lokomotiv Moscow - Amkar Soccer: Russia… Full Article halftime picks and tips halftime predictions HALF TIME RESULT Monday Matches
al Goals Scored Picks *** Tuesday *** 19 September 2017 By dataviz.tumblr.com Published On :: Mon, 18 Sep 2017 16:05:01 -0400 We have a new preview on https://www.007soccerpicks.com/tuesday-matches/goals-scored-picks-tuesday-19-september-2017/Goals Scored Picks *** Tuesday *** 19 September 2017 MATCH GOALS PICKS To return: ??? USD Odds: 6.27 Stake: 100 USD Starting in Teams Our Prediction Odds Burnley - Leeds Soccer: England - Carabao Cup OVER 2.5 2.00 Schalke - Bayern Munich Soccer: Germany -… Full Article over 2.5 goals tips under 2.5 goals predictions MATCH GOALS Tuesday Matches
al Half Time Picks *** Tuesday *** 19 September 2017 By dataviz.tumblr.com Published On :: Mon, 18 Sep 2017 16:05:21 -0400 We have a new preview on https://www.007soccerpicks.com/tuesday-matches/half-time-picks-tuesday-19-september-2017/Half Time Picks *** Tuesday *** 19 September 2017 HALF TIME PICKS To return: ??? USD Odds: 6.93 Stake: 100 USD Starting in Teams Half Time Our Pick Odds Crystal Palace - Huddersfield Soccer: England - Carabao Cup HALF TIME X 2.10 FC Augsburg - RB… Full Article halftime picks halftime predictions and tips HALF TIME RESULT Tuesday Matches
al Non-associative Frobenius algebras for simply laced Chevalley groups. (arXiv:2005.02625v1 [math.RA] CROSS LISTED) By arxiv.org Published On :: We provide an explicit construction for a class of commutative, non-associative algebras for each of the simple Chevalley groups of simply laced type. Moreover, we equip these algebras with an associating bilinear form, which turns them into Frobenius algebras. This class includes a 3876-dimensional algebra on which the Chevalley group of type E8 acts by automorphisms. We also prove that these algebras admit the structure of (axial) decomposition algebras. Full Article
al The entropy of holomorphic correspondences: exact computations and rational semigroups. (arXiv:2004.13691v1 [math.DS] CROSS LISTED) By arxiv.org Published On :: We study two notions of topological entropy of correspondences introduced by Friedland and Dinh-Sibony. Upper bounds are known for both. We identify a class of holomorphic correspondences whose entropy in the sense of Dinh-Sibony equals the known upper bound. This provides an exact computation of the entropy for rational semigroups. We also explore a connection between these two notions of entropy. Full Article
al Solutions for nonlinear Fokker-Planck equations with measures as initial data and McKean-Vlasov equations. (arXiv:2005.02311v2 [math.AP] UPDATED) By arxiv.org Published On :: One proves the existence and uniqueness of a generalized (mild) solution for the nonlinear Fokker--Planck equation (FPE) egin{align*} &u_t-Delta (eta(u))+{mathrm{ div}}(D(x)b(u)u)=0, quad tgeq0, xinmathbb{R}^d, d e2, \ &u(0,cdot)=u_0,mbox{in }mathbb{R}^d, end{align*} where $u_0in L^1(mathbb{R}^d)$, $etain C^2(mathbb{R})$ is a nondecreasing function, $bin C^1$, bounded, $bgeq 0$, $Din(L^2cap L^infty)(mathbb{R}^d;mathbb{R}^d)$ with ${ m div}, Din L^infty(mathbb{R}^d)$, and ${ m div},Dgeq0$, $eta$ strictly increasing, if $b$ is not constant. Moreover, $t o u(t,u_0)$ is a semigroup of contractions in $L^1(mathbb{R}^d)$, which leaves invariant the set of probability density functions in $mathbb{R}^d$. If ${ m div},Dgeq0$, $eta'(r)geq a|r|^{alpha-1}$, and $|eta(r)|leq C r^alpha$, $alphageq1,$ $alpha>frac{d-2}d$, $dgeq3$, then $|u(t)|_{L^infty}le Ct^{-frac d{d+(alpha-1)d}} |u_0|^{frac2{2+(m-1)d}},$ $t>0$, and the existence extends to initial data $u_0$ in the space $mathcal{M}_b$ of bounded measures in $mathbb{R}^d$. The solution map $mumapsto S(t)mu$, $tgeq0$, is a Lipschitz contractions on $mathcal{M}_b$ and weakly continuous in $tin[0,infty)$. As a consequence for arbitrary initial laws, we obtain weak solutions to a class of McKean-Vlasov SDEs with coefficients which have singular dependence on the time marginal laws. Full Article
al Almost invariant subspaces of the shift operator on vector-valued Hardy spaces. (arXiv:2005.02243v2 [math.FA] UPDATED) By arxiv.org Published On :: In this article, we characterize nearly invariant subspaces of finite defect for the backward shift operator acting on the vector-valued Hardy space which is a vectorial generalization of a result of Chalendar-Gallardo-Partington (C-G-P). Using this characterization of nearly invariant subspace under the backward shift we completely describe the almost invariant subspaces for the shift and its adjoint acting on the vector valued Hardy space. Full Article
al Nonlinear singular problems with indefinite potential term. (arXiv:2005.01789v3 [math.AP] UPDATED) By arxiv.org Published On :: We consider a nonlinear Dirichlet problem driven by a nonhomogeneous differential operator plus an indefinite potential. In the reaction we have the competing effects of a singular term and of concave and convex nonlinearities. In this paper the concave term is parametric. We prove a bifurcation-type theorem describing the changes in the set of positive solutions as the positive parameter $lambda$ varies. This work continues our research published in arXiv:2004.12583, where $xi equiv 0 $ and in the reaction the parametric term is the singular one. Full Article
al Entropy and Emergence of Topological Dynamical Systems. (arXiv:2005.01548v2 [math.DS] UPDATED) By arxiv.org Published On :: A topological dynamical system $(X,f)$ induces two natural systems, one is on the probability measure spaces and other one is on the hyperspace. We introduce a concept for these two spaces, which is called entropy order, and prove that it coincides with topological entropy of $(X,f)$. We also consider the entropy order of an invariant measure and a variational principle is established. Full Article
al Resonances as Viscosity Limits for Exponentially Decaying Potentials. (arXiv:2005.01257v2 [math.SP] UPDATED) By arxiv.org Published On :: We show that the complex absorbing potential (CAP) method for computing scattering resonances applies to the case of exponentially decaying potentials. That means that the eigenvalues of $-Delta + V - iepsilon x^2$, $|V(x)|leq e^{-2gamma |x|}$ converge, as $ epsilon o 0+ $, to the poles of the meromorphic continuation of $ ( -Delta + V -lambda^2 )^{-1} $ uniformly on compact subsets of $ extrm{Re},lambda>0$, $ extrm{Im},lambda>-gamma$, $arglambda > pi/8$. Full Article
al Approximate Two-Sphere One-Cylinder Inequality in Parabolic Periodic Homogenization. (arXiv:2005.00989v2 [math.AP] UPDATED) By arxiv.org Published On :: In this paper, for a family of second-order parabolic equation with rapidly oscillating and time-dependent periodic coefficients, we are interested in an approximate two-sphere one-cylinder inequality for these solutions in parabolic periodic homogenization, which implies an approximate quantitative propagation of smallness. The proof relies on the asymptotic behavior of fundamental solutions and the Lagrange interpolation technique. Full Article
al Solving an inverse problem for the Sturm-Liouville operator with a singular potential by Yurko's method. (arXiv:2004.14721v2 [math.SP] UPDATED) By arxiv.org Published On :: An inverse spectral problem for the Sturm-Liouville operator with a singular potential from the class $W_2^{-1}$ is solved by the method of spectral mappings. We prove the uniqueness theorem, develop a constructive algorithm for solution, and obtain necessary and sufficient conditions of solvability for the inverse problem in the self-adjoint and the non-self-adjoint cases Full Article
al Convergent normal forms for five dimensional totally nondegenerate CR manifolds in C^4. (arXiv:2004.11251v2 [math.CV] UPDATED) By arxiv.org Published On :: Applying the equivariant moving frames method, we construct convergent normal forms for real-analytic 5-dimensional totally nondegenerate CR submanifolds of C^4. These CR manifolds are divided into several biholomorphically inequivalent subclasses, each of which has its own complete normal form. Moreover it is shown that, biholomorphically, Beloshapka's cubic model is the unique member of this class with the maximum possible dimension seven of the corresponding algebra of infinitesimal CR automorphisms. Our results are also useful in the study of biholomorphic equivalence problem between CR manifolds, in question. Full Article
al Finite dimensional simple modules of $(q, mathbf{Q})$-current algebras. (arXiv:2004.11069v2 [math.RT] UPDATED) By arxiv.org Published On :: The $(q, mathbf{Q})$-current algebra associated with the general linear Lie algebra was introduced by the second author in the study of representation theory of cyclotomic $q$-Schur algebras. In this paper, we study the $(q, mathbf{Q})$-current algebra $U_q(mathfrak{sl}_n^{langle mathbf{Q} angle}[x])$ associated with the special linear Lie algebra $mathfrak{sl}_n$. In particular, we classify finite dimensional simple $U_q(mathfrak{sl}_n^{langle mathbf{Q} angle}[x])$-modules. Full Article
al Equivalence of classical and quantum completeness for real principal type operators on the circle. (arXiv:2004.07547v3 [math.AP] UPDATED) By arxiv.org Published On :: In this article, we prove that the completeness of the Hamilton flow and essential self-dajointness are equivalent for real principal type operators on the circle. Moreover, we study spectral properties of these operators. Full Article
al Set-Theoretical Problems in Asymptology. (arXiv:2004.01979v3 [math.GN] UPDATED) By arxiv.org Published On :: In this paper we collect some open set-theoretic problems that appear in the large-scale topology (called also Asymptology). In particular we ask problems about critical cardinalities of some special (large, indiscrete, inseparated) coarse structures on $omega$, about the interplay between properties of a coarse space and its Higson corona, about some special ultrafilters ($T$-points and cellular $T$-points) related to finitary coarse structures on $omega$, about partitions of coarse spaces into thin pieces, and also about coarse groups having some extremal properties. Full Article
al Tori Can't Collapse to an Interval. (arXiv:2004.01505v3 [math.DG] UPDATED) By arxiv.org Published On :: Here we prove that under a lower sectional curvature bound, a sequence of manifolds diffeomorphic to the standard $m$-dimensional torus cannot converge in the Gromov-Hausdorff sense to a closed interval. Full Article
al The $kappa$-Newtonian and $kappa$-Carrollian algebras and their noncommutative spacetimes. (arXiv:2003.03921v2 [hep-th] UPDATED) By arxiv.org Published On :: We derive the non-relativistic $c oinfty$ and ultra-relativistic $c o 0$ limits of the $kappa$-deformed symmetries and corresponding spacetime in (3+1) dimensions, with and without a cosmological constant. We apply the theory of Lie bialgebra contractions to the Poisson version of the $kappa$-(A)dS quantum algebra, and quantize the resulting contracted Poisson-Hopf algebras, thus giving rise to the $kappa$-deformation of the Newtonian (Newton-Hooke and Galilei) and Carrollian (Para-Poincar'e, Para-Euclidean and Carroll) quantum symmetries, including their deformed quadratic Casimir operators. The corresponding $kappa$-Newtonian and $kappa$-Carrollian noncommutative spacetimes are also obtained as the non-relativistic and ultra-relativistic limits of the $kappa$-(A)dS noncommutative spacetime. These constructions allow us to analyze the non-trivial interplay between the quantum deformation parameter $kappa$, the curvature parameter $eta$ and the speed of light parameter $c$. Full Article
al Solitary wave solutions and global well-posedness for a coupled system of gKdV equations. (arXiv:2002.09531v2 [math.AP] UPDATED) By arxiv.org Published On :: In this work we consider the initial-value problem associated with a coupled system of generalized Korteweg-de Vries equations. We present a relationship between the best constant for a Gagliardo-Nirenberg type inequality and a criterion for the existence of global solutions in the energy space. We prove that such a constant is directly related to the existence problem of solitary-wave solutions with minimal mass, the so called ground state solutions. To guarantee the existence of ground states we use a variational method. Full Article
al Three-point Functions in $mathcal{N}=4$ SYM at Finite $N_c$ and Background Independence. (arXiv:2002.07216v2 [hep-th] UPDATED) By arxiv.org Published On :: We compute non-extremal three-point functions of scalar operators in $mathcal{N}=4$ super Yang-Mills at tree-level in $g_{YM}$ and at finite $N_c$, using the operator basis of the restricted Schur characters. We make use of the diagrammatic methods called quiver calculus to simplify the three-point functions. The results involve an invariant product of the generalized Racah-Wigner tensors ($6j$ symbols). Assuming that the invariant product is written by the Littlewood-Richardson coefficients, we show that the non-extremal three-point functions satisfy the large $N_c$ background independence; correspondence between the string excitations on $AdS_5 imes S^5$ and those in the LLM geometry. Full Article
al Willems' Fundamental Lemma for State-space Systems and its Extension to Multiple Datasets. (arXiv:2002.01023v2 [math.OC] UPDATED) By arxiv.org Published On :: Willems et al.'s fundamental lemma asserts that all trajectories of a linear system can be obtained from a single given one, assuming that a persistency of excitation condition holds. This result has profound implications for system identification and data-driven control, and has seen a revival over the last few years. The purpose of this paper is to extend Willems' lemma to the situation where multiple (possibly short) system trajectories are given instead of a single long one. To this end, we introduce a notion of collective persistency of excitation. We will then show that all trajectories of a linear system can be obtained from a given finite number of trajectories, as long as these are collectively persistently exciting. We will demonstrate that this result enables the identification of linear systems from data sets with missing data samples. Additionally, we show that the result is of practical significance in data-driven control of unstable systems. Full Article
al EMSx: A Numerical Benchmark for Energy Management Systems. (arXiv:2001.00450v2 [math.OC] UPDATED) By arxiv.org Published On :: Inserting renewable energy in the electric grid in a decentralized manneris a key challenge of the energy transition. However, at local scale, both production and demand display erratic behavior, which makes it delicate to match them. It is the goal of Energy Management Systems (EMS) to achieve such balance at least cost. We present EMSx, a numerical benchmark for testing control algorithms for the management of electric microgrids equipped with a photovoltaic unit and an energy storage system. EMSx is made of three key components: the EMSx dataset, provided by Schneider Electric, contains a diverse pool of realistic microgrids with a rich collection of historical observations and forecasts; the EMSx mathematical framework is an explicit description of the assessment of electric microgrid control techniques and algorithms; the EMSx software EMSx.jl is a package, implemented in the Julia language, which enables to easily implement a microgrid controller and to test it. All components of the benchmark are publicly available, so that other researchers willing to test controllers on EMSx may reproduce experiments easily. Eventually, we showcase the results of standard microgrid control methods, including Model Predictive Control, Open Loop Feedback Control and Stochastic Dynamic Programming. Full Article
al Linear Convergence of First- and Zeroth-Order Primal-Dual Algorithms for Distributed Nonconvex Optimization. (arXiv:1912.12110v2 [math.OC] UPDATED) By arxiv.org Published On :: This paper considers the distributed nonconvex optimization problem of minimizing a global cost function formed by a sum of local cost functions by using local information exchange. We first propose a distributed first-order primal-dual algorithm. We show that it converges sublinearly to the stationary point if each local cost function is smooth and linearly to the global optimum under an additional condition that the global cost function satisfies the Polyak-{L}ojasiewicz condition. This condition is weaker than strong convexity, which is a standard condition for proving the linear convergence of distributed optimization algorithms, and the global minimizer is not necessarily unique or finite. Motivated by the situations where the gradients are unavailable, we then propose a distributed zeroth-order algorithm, derived from the proposed distributed first-order algorithm by using a deterministic gradient estimator, and show that it has the same convergence properties as the proposed first-order algorithm under the same conditions. The theoretical results are illustrated by numerical simulations. Full Article