Design optimization of innovative electrical machines topologies based on Pyleecan open-source object-oriented software

Offshore wind power generation has broad application prospects. The current single-unit capacity of offshore wind generators exceeds 20 MW. Superconducting (SC) armature permanent magnet (PM) generators have high current-carrying characteristics and can overcome the bottlenecks of the copper armature PM synchronous generator in terms of volume and weight. However, existing SC armature windings usually use an integrated dewar, which is difficult and costly to design and is not conducive to maintenance. In addition, SC armature windings are mostly three-phase windings, and the fault-tolerant operational capability of SC armature electrical machines is poor. In response to the above problems, this paper proposes a dual three-phase PM vernier SC armature electrical machine (DTVSM), which adopts an SC magnet with a static seal of the cooling medium. Each SC magnet used a modular dewar and contained two sets of SC coils. The SC magnets are connected externally to form a dual three-phase SC armature winding, which improves the fault-tolerant operational capability of the SC armature PM electrical machine. Compared with the 20 MW copper armature PM synchronous electrical machine, the unit volume torque density of the proposed DTVSM is about 108.22 kN• m/m3, which represents an improvement of about 60%, indicating significant application potential. This study designs and tests a 10 kW prototype, focusing on the electrical machine topology, working principle, and manufacture of SC magnets and prototype, and the related experimental tests verify the feasibility of the DTVSM technology route.

The Move to the Middle: Convergence of the Open-Source and Proprietary Software Industries

Over the past decade, numerous computer-assisted retrosynthesis reaction prediction methods have been reported in the chemical literature, several of which are also shared as open-source code. Reports of integrating these modern open-source retrosynthetic prediction techniques into the chemical education classroom, however, is largely absent. This article describes our efforts to teach a computer-assisted retrosynthesis workshop series using open-source reaction prediction software and methods. In addition to three workshops on selected open-source reaction prediction methods, the series included workshops on Python programming and introductory cheminformatics using the RDKit cheminformatics toolkit. A pre and post survey was distributed to better understand participant familiarity and workshop outcomes. Participants indicated that they had minimal experience with cheminformatics, and open-source retrosynthesis software, however after the workshop series they indicated increased familiarity, interest, and desire to pursue additional training related to open-source retrosynthesis software and methods. We conclude this article with our experiences and ideas for future improvements. The workshop materials and code are available with an open source license, and educators are encouraged to adapt and improve the lessons (https://github.com/UA-Libraries-Research-Data-Services/retrosynthesis).

Open-source software abbreviated as OSS is computer software that is available with source code and is provided under a software license that permits users to study, change, and improve the software. For the commercial software the source code and certain other rights are normally reserved for copyright holders,i.e. the company who developes the software. A group of people in a collaborative manner often developes the Open source software, not under the roof of a large organization. This strategy makes open source software cheap, reliable and modifiable if needed. In this context we shall discuss mainly the features of Open Source Software, differences of open source and free software and open source software movement in Indian perspective.

Open source software is becoming increasingly prominent, and the economic structure of open-source development is changing. In recent years, firms motivated by revenues from software services markets have become the primary contributors to open-source development. In this paper we study the role of services in open source software development and explore the choice between open source and proprietary software. Specifically, our economic model jointly analyzes the investment and pricing decisions of the originators of software and of subsequent open-source contributors. We find that if a contributor is efficient in software development, the originator should adopt an open-source strategy, allowing the contributor to offer higher total quality and capture the higher end of the market while the originator focuses on providing software services to lower end consumers. Conversely, if the contributor is not efficient in development, the originator should adopt a proprietary software development strategy, gaining revenue from software sales and squeezing the contributor out of the services market. In certain cases an increase in originator development efficiency can result in increased contributor profits. Finally, we find that, somewhat counterintuitively, an increase in contributor development efficiency can reduce overall social welfare.

A lot misinformation and mystery surrounds the topic of Open Source software. The conceptual misunderstanding of software is fostered, in some respects, by a lack of understanding within the professional ranks of the computer field. There are many different views of Open Source software today, based upon ones perspective. After about 20 years of evolution, the position of Open Source in our economy still has not coalesced. Few seems to understand whether Open Source is free software for running a computer (i.e., Linux) or just a way to obtain some software products without giving Microsoft ones money. “There is one thing stronger than all the armies in the world and that is an idea whose time has come” - Victor Hugo any view Open Source (OS) software as just a free alternative to proprietary software. The term does not mean that there is no cost associated with its procurement, although some vendors do provide free versions. The word “free” usually means the freedom to copy, modify, or distribute the software. One must be very careful when applying this broad, general meaning to Open Source software. There are many different Open Source licenses in use and it is imperative that users acquaint themselves with the legal ramifications of dealing with intellectual property rights. ` Open Source software should be viewed as a viable alternative in many software selection processes. Recently, the news has portrayed the report of India's Kerala state moving to Linux and OpenOffice for its 2,724 high schools. Likewise, OpenOffice is replacing Microsoft Office in many schools districts around the US. With tight school budgets, school superintendents are realizing significant cost savings by using the OpenOffice products for their campuses. Products such as OpenOffice may not be 100% compatible with their current proprietary counterpart, but for many applications, compatibility is not the issue. The price and the software license management of proprietary packages may be overwhelming.

Open Source vs. Proprietary Software: Competition and Compatibility

This paper presents an analysis of three different electrical machine topologies for a turbo circulator application. The electrical machines are designed to operate with 6 kW output power at 120 000 r/min. This paper demonstrates the design aspects of one solid rotor squirrel cage induction motor and two permanent magnet synchronous machines. The machines are compared using electromagnetic, thermal, and mechanical analyses. The benefits and disadvantages of each topology under study are discussed. For other high-speed applications presented, a comparative approach helps in selecting the suitable electrical machine topology by analyzing the performance criteria discussed. The prototype construction of one of the topologies is analyzed.

In this paper, we study oligopolistic competition between closed and open source softwares. By intersecting existing economic contributions on open source, we propose a two stage game with perfect information and product di¤eretiation in which producers firstly set softwares quality, then they determine prices (constrained at zero for open source programs). In doing this, we explicitly model lock-in e¤ects, network externality components of software quality as well as knowledge accumulation in software use and implementation. With respect to a monopolistic benchmark case, we argue that in duopoly a pro- prietary sofware producer facing an open source software will reduce its selling price whether: (i) its network of users is larger than open sources one and its consumers are largely experienced on its program, (ii) it has a small network of un-skilled consumers. In opposition, after open source softwares emergence, proprietary software price does augment if proprietary software users form a large, but poorly skilled network. Fur- thermore, we show that, in all above cases, proprietary software quality increases because of the existence of a open source alternative to a previouisly monopolistic program. Finally, by modeling knowledge accumulation processes through di¤erence equations, we show that the ratio between closed and open source programs opportunity costs of software learning and deployment plays a crucial role in shaping market outcomes. Until an open source software remains too complex and technical for unskilled or time-scarse users, a shared market solution in which both softwares are adopted is predicted. In contrast, if opportunity costs in learning and understanding open source programs are remarkably low, or at least equal to opportunity costs of a closed source software, then a open source dominance outcome (i.e. all software are open ones) phases out.

This Special Section on "Optimization of Electrical Machine Designs" summarizes the state-of-the-art on the latest researches carried out on the topic, both in the academic and industrial environments. Basically, all the electrical machine topologies and optimization techniques have been discussed in this Section, suggesting to the readers interesting solutions of several optimization problems related with modern applications. The second part of the special section (the first one has been published in the December 2017 issue of the IEEE Transactions on Industrial Electronics) includes 20 papers from a total of 44 accepted contributions. The studies included in the Part II are categorized in a table and are outlined to some extent in order to help the readers to quickly compare the main peculiarities of the mathematical approaches and the practical implementations. The Part II paper categorization of this Special Section presents a second set of four papers focused on the permanent magnet synchronous machines

Open source software (OSS) is computer software that has its underlying source code made available under a licence. This can allow developers and users to adapt and improve it (Raymond, 2001). Computer software can be broadly split into two development models: • Proprietary, or closed software, owned by a company or individual. Copies of the binary are made public; the source code is not usually made public. • Open-source software (OSS), where the source code is released with the binary. Users and developers can be licenced to use and modify the code, and to distribute any improvements they make. Both OSS and proprietary approaches allow companies to make a profit. Companies developing proprietary software make money by developing software and then selling licences to use the software. For example, Microsoft receives a payment for every copy of Windows sold with a personal computer. OSS companies make their money by providing services, such as advising clients on the GPL licence. The licencee can either charge a fee for this service or work free of charge. In practice, software companies often develop both types of software. OSS is developed by an ongoing, iterative process where people share the ideas expressed in the source code. The aim is that a large community of developers and users can contribute to the development of the code, check it for errors and bugs, and make the improved version available to others. Project management software is used to allow developers to keep track of the various versions. There are two main types of open-source licences (although there are many variants and subtypes developed by other companies): • Berkeley Software Distribution (BSD) Licence: This permits a licencee to “close” a version (by withholding the most recent modifications to the source code) and sell it as a proprietary product; • GNU General Public Licence (GNU, GPL, or GPL): Under this licence, licencees may not “close” versions. The licencee may modify, copy, and redistribute any derivative version, under the same GPL licence. The licencee can either charge a fee for this service or work free of charge. Free software first evolved during the 1970s but in the 1990s forked into two movements, namely free software and open source (Berry, 2004). Richard Stallman, an American software developer who believes that sharing source code and ideas is fundamental to freedom of speech, developed a free version of the widely used Unix operating system. The resulting GNU program was released under a specially created General Public Licence (GNU, GPL). This was designed to ensure that the source code would remain openly available to all. It was not intended to prevent commercial usage or distribution (Stallman, 2002). This approach was christened free software. In this context, free meant that anyone could modify the software. However, the term “free” was often misunderstood to mean no cost. Hence, during the 1990s, Eric Raymond and others proposed that open-source software was coined as a less contentious and more business-friendly term. This has become widely accepted within the software and business communities; however there are still arguments about the most appropriate term to use (Moody, 2002). The OSMs are usually organised into a network of individuals who work collaboratively on the Internet, developing major software projects that sometimes rival commercial software but are always committed to the production of quality alternatives to those produced by commercial companies (Raymond, 2001; Williams, 2002). Groups and individuals develop software to meet their own and others’ needs in a highly decentralised way, likened to a Bazaar (Raymond, 2001). These groups often make substantive value claims to support their projects and foster an ethic of community, collaboration, deliberation, and intellectual freedom. In addition, it is argued by Lessig (1999) that the FLOSS community can offer an inspiration in their commitment to transparency in their products and their ability to open up governmental regulation and control through free/libre and open source code.

Is Open Source About Innovation? How Interactions with the Open Source Community Impact on the Innovative Performances of Entrepreneurial Ventures

Social network analysis of open source software: A review and categorisation

Open has defined my professional career in every way imaginable: for almost ten years now it has been the motivating force in my career, the mode in which I work, and the subject that I research. As a result, today I live and breathe open—but it has not always been this way. What follows is the story of how open proved itself to me. It is a story that demonstrates how participating in open projects and processes can lead to unexpected opportunities. In my case, these opportunities have taken me on a journey from an itinerant software developer, to a workshop instructor in over a dozen countries, to a PhD at Stanford University, and finally to an academic career. These opportunities have lead to my contributing thousands of lines of code, over a dozen research articles, two edited books, countless workshops for journal editors, and the teaching of undergraduate and graduate students. More importantly, they have allowed me to contribute back to the region of the world from which I emigrated as a child by helping to amplify the voices of Latin American scholars worldwide. This unexpected journey started in January 2006 when I took a job at the open access Journal of Medical Internet Research (JMIR), where I was responsible, among other things, for upgrading the journal to the latest version of the Public Knowledge Project's (PKP) open source software Open Journal Systems (OJS). JMIR has been a pioneer in open access, and it was doing so using open source software as its foundation. Unbeknownst to me at the time, this convergence of open source with open access would become the defining trait of my career. As a software developer by training, I knew the benefits of open source software from a practical level. The existence of OJS made my job at JMIR easier (plus, it came at a convenient price!). But it was not until I was ready to leave that job (I wanted to move back to my native Argentina) that I realized how contributing to an open source project could also lead to new and unexpected opportunities. I had been contributing code back to PKP—this is what you do when you develop open source—and so when I emailed PKP's director (John Willinsky) asking for short contract to finalize a few contributions, he already knew who I was and readily agreed. What was surprising to me, was that he also asked me to lead a series of workshops on open access and OJS in Latin America. It is a testament to John Willinsky that he hired me to represent PKP without ever asking for a CV—my code contributions had spoken for themselves. This work set off a chain of events that is still unfolding to this date. My open source code contributions lead to regular work with PKP: writing software, running workshops, conducting surveys, and studying the results. The work kept me off the streets of Argentina, but more importantly, it allowed me to engage with Latin Americans and reconnect with a region I had emigrated from fifteen years prior. As I engaged, I learned about the plight of Latin American scholars, and of the incredible interest from the region in open access. I quickly realized that my technical expertise in OJS could serve the interests of these scholars, and supporting them has become a driving motivation in all my professional activities. I have always felt proud of my contributions OJS, and in how this open source software supports open access, but over time I felt the need to better understand the role of open access itself. This curiosity led me to a PhD program at Stanford University, where I was able to devote my attention to studying the Public Impact of Latin America's Approach to Open Access and other aspects of scholarly publishing. Along the way, I have ensured that all my research outputs are openly available. Contrary to researcher's concerns, this has not prevented me from getting a faculty position in a market where these are increasingly rare. My hope is to use this position to continue to further our understanding of open access and of Latin America's scholarly communication, with the belief that this will lead to positive outcomes for the region. Whatever contributions I make—through research, software, or in my life in general—were enabled by contributing to open source and open access. I owe this debt to openness, and I intend to pay it back for the rest of my career by being open about my work, and by contributing to projects and organizations that support openness. This is, after all, what you do in an open ecosystem. It is the secret sauce of openness, and I invite you to benefit from it as much as I have.

Open Source Software (OSS) is software products available to the public, with its source code to study, change, and improves its design. Open Source Software Development (OSSD) is the process by which open source software is developed within the confines of software engineering life-cycle methods. However when open source used for commercial purpose, then an open source license is required. Open source software is very often developed in a public and collaborative manner. The quality assurance principle under open source software development is an approach to improve software product quality against traditional methods and techniques. Despite the fact that the open source developments have seen remarkable successful in recent years, there are a number of product quality issues and challenges facing the open source development model. Many industries and business sectors are following or using OSSD, since they realize the benefits, but they do have some reservations concerning quality assurance in the form of program code quality, maintenance of the code and its quality, over the life-cycle of the product and third party usage. This paper reviews the literature of the process of the latest quality assurance, under open source software development methods and techniques. The result from this review is to show the process of quality assurance of open source software and that how it can affect the overall quality assurance principal.