Блог ЛЕДАС
LEDAS' Birthday on Mathematician's Day
Апр 01, 2021Today is April 1 and we are 22 years old! We are proud of our history, but we could not imagine that a whole year of remote work would become a part of it. Fortunately, we are starting to return to the office step by step. Today we will celebrate our birthday with a small group of employees who have already been vaccinated.
However, we hope that we will meet together and continue celebrating in June on the seashore. In fact, this is not a sea, but a reservoir next to the dam. It is so large that at some points the opposite shore is not visible, that is why we call it the Ob Sea. By the way, at the beginning of April the Ob Sea is still ...
Pivot Points In the Story of LEDAS
Мар 30, 2021It’s just before our 22nd anniversary on April 1, and looking back at the history of LEDAS, I see that the first years from each decade were, for our company, the really important ones. Often, these years started new stories and finalized old ones.
Arguably, 2011 was the most pivotal year in LEDAS’ history. Let me list the top five events that happened to our company ten years ago:
- Top management changed completely when co-founder David Levin stepped back as CEO and took on the role of Chairman of the Board. A new generation of young managers, aged around 30 years old, now occupied the CEO, CTO, and COO positions.
- Thanks to advice from an industry mate, LEDAS decided to focus mostly on high-quality software R&D (research and ...
LEDAS Anagrams: Seawater Folds
Мар 01, 2021One aspect of intelligence is the ability to quickly run through a range of options. It is not that people must get through alternatives faster than a computer, but that they move systematically and purposefully from one option (when found to be wrong) to another option, finding the better direction in which to move. We are talking here about the ability to adjust the brain to the specifics of a task, about the rapid training of one’s own neural network.
Today we invite you to come up with anagrams that are meaningful to you and that involve our primary topic of interest, CAD/CAE/CAM/PLM/BIM. When we program computers to work with anagrams, they go through words in a dictionary incredibly quickly, trying the various permutations and analyzing the ...
Meet isicad, the Bigger Brother to Our LEDAS Blog
Дек 30, 2020Some 16 years ago, LEDAS founded isicad.ru, which since has become the leading Russian-language Web portal covering engineering software. Over the years, it has published about 10,000 articles on topics like CAD, CAM, CAE, PLM, BIM, generative design, cloud technology, additive manufacturing, and digital twins.
The portal reports on developments in both the Russian and global markets. It offers readers news articles, interviews on technological advances, trends in innovation, financial results, and described the business development of significant companies. As well, isicad.ru placed promotional materials on the portal, including the home page, for nearly all of the major players in the Russian market – Ansys, Autodesk, ASCON, Dassault Systemes, Hexagon, PTC, Siemens Digital Software, Top Systems, and more.
LEDAS' long-running, actively-maintained isicad.ru portal, along with the CAD conferences held ...
From LEDAS: The Polyomino Contest!
Дек 03, 2020You may have encountered polyominoes at some point in your life, because they are used in puzzles popular for more than 100 years, including ones like Tetris.
A polyomino is a plane geometric figure formed by joining one or more equal squares, edge to edge. The name was devised by Solomon Golomb in 1953 in a now-classic textbook, and then popularized by Martin Gardner in 1960; see the “Mathematical Games” column in Scientific American.
Today we’ll play with our updated LEDAS logo, which we released a year ago. As you can see, it consists of four pentominoes. A pentomino is a polyomino of order 5, i.e. 5 equal-sized squares connected edge-to-edge.
Splitting the LEDAS Logo Into Polyominos
Our question today is this: what is the number ...
Personal Management in Agile Style
Ноя 23, 2020Some people are just naturally efficient. Others (me being one of them) are in a constant search for methods and tools that would make us more productive. There have been dozens of times when I tried this or that productivity technique or time management system and each time, after days or weeks of enthusiastic usage, I found myself dropping them. (I’m not saying, though, that all of that was in vain: enthusiasm means a lot, because it helps a lot!)
I have, however, been using my current productivity tool for more than a year now, which for me is a long period of time. As a result of my experience, I’d like to share in this article some ideas that could be useful to you in maintaining a personal management ...
Our Engine-mounted Table
Окт 29, 2020Due to COVID-19, all of our employees at LEDAS continue to work remotely, but we decided not to waste time by being just at home. We did a minor upgrade to our office interior in anticipation of the day we return to our headquarters.
You probably know that one of the key competencies of LEDAS is a set of tools for computer-aided design, some of which you can see in our CAD Solutions list, and so we used them to decorate our entrance hall with an exclusive, glass-topped table mounted on the cylinder block of an actual Mercedes-Benz engine. You can see the result, made by Alex, in the photo.
Engines, by the way, are produced not only by Mercedes Benz but also by us at LEDAS. You ...
Why we use Visitor pattern in C++ CAD projects
Сен 14, 2020One hierarchy, many algorithms
Geometrical modeling projects often contain some form of central hierarchy of objects. A geometric kernel, for example, has a hierarchy of geometric entities. Another example is a geometric solver which has a hierarchy of objects and constraints. Simplified inheritance diagrams for these hierarchies are shown in the figures below.
Many routines/algorithms of other modules need to process all the entities in a hierarchy in a similar fashion, although with different implementation details. So, polymorphism naturally is used with these kinds of hierarchies.
Assuming we are talking about C++ (and this is usually the programming language of choice for algorithmic libraries in CAD), using virtual functions is the first consideration for implementing polymorphic behaviour.
However, a variety of routines applied to the entire hierarchy, ...
LEDAS Life Contest
Авг 31, 2020Let’s go all the way back to 1970 and to the Game of Life. Also known simply as Life, this program is based on cellular automaton and was devised by British mathematician John Horton Conway.
The rules of Life
The rules of Life are simple: The universe in which Life is played is an infinite, two-dimensional grid of square cells. Each cell has one of two possible states, on or off, filled or empty, live or dead.
Each cell interacts only with its eight neighbours. Neighbour cells are adjacent horizontally, vertically, and diagonally.
Cells stay alive when they have two or three neighbours. Live cells with fewer than two, or more than three, live neighbours die, as if by underpopulation or overpopulation. Dead cells with exactly three live ...
What Statistics Can Tell Us About SARS-CoV-2 Test Results
Antibody testing at LEDAS shows good results. What does it mean?
Июл 20, 2020To better estimate the situation with СOVID-19 within our company LEDAS, we decided to make antibody testing available to our employees who work remotely since March. Fifty-three of our 70+ employees were interested, and so we organized out-of-lab testing thanks to Invitro’s laboratory service. Both IgM (early antibodies) and IgG (late antibodies) were examined, and the results were simple: all had zero positives for IgM, and one employee was positive for IgG.
We were able to congratulate ourselves for the zero result in early antibodies, meaning we are quite safe. But now we needed to focus on the late antibodies, as they provide more interesting information. Since we at LEDAS are now involved in more medical software projects, we considered this an opportunity to apply statistics to our ...