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Steiner F.,TU Munich | Dempfle S.,TU Munich | Dempfle S.,Bain and Company | Ingber A.,Stanford University | And 2 more authors.
IEEE Transactions on Information Theory | Year: 2016

We study the problem of compression for the purpose of similarity identification, where similarity is measured by the mean square Euclidean distance between vectors. While the asymptotical fundamental limits of the problem-the minimal compression rate and the error exponent-were found in a previous work, in this paper, we focus on the nonasymptotic domain and on practical, implementable schemes. We first present a finite blocklength achievability bound based on shape-gain quantization: the gain (amplitude) of the vector is compressed via scalar quantization, and the shape (the projection on the unit sphere) is quantized using a spherical code. The results are numerically evaluated, and they converge to the asymptotic values, as predicted by the error exponent. We then give a nonasymptotic lower bound on the performance of any compression scheme, and compare to the upper (achievability) bound. For a practical implementation of such a scheme, we use wrapped spherical codes, studied by Hamkins and Zeger, and use the Leech lattice as an example for an underlying lattice. As a side result, we obtain a bound on the covering angle of any wrapped spherical code, as a function of the covering radius of the underlying lattice. © 2016 IEEE. Source


Sojer M.,TU Munich | Sojer M.,Bain and Company | Henkel J.,TU Munich
Journal of the Association of Information Systems | Year: 2010

The focus of existing open source software (OSS) research has been on how and why individuals and firms add to the commons of public OSS code-that is, on the "giving" side of this open innovation process. In contrast, research on the corresponding "receiving" side of the innovation process is scarce. We address this gap, studying how existing OSS code is reused and serves as an input to further OSS development. Our findings are based on a survey with 686 responses from OSS developers. As the most interesting results, our multivariate analyses of developers' code reuse behavior point out that developers with larger personal networks within the OSS community and those who have experience in a greater number of OSS projects reuse more, presumably because both network size and a broad project experience facilitate local search for reusable artifacts. Moreover, we find that a development paradigm that calls for releasing an initial functioning version of the software early-as the "credible promise" in OSS-leads to increased reuse. Finally, we identify developers' interest in tackling difficult technical challenges as detrimental to efficient reuse-based innovation. Beyond OSS, we discuss the relevance of our findings for companies developing software and for the receiving side of open innovation processes, in general. Source


Irvin K.,Washington University in St. Louis | Hiteshue E.,Bain and Company | Lanzerotti M.,Augsburg College | Langley D.,Stevens Institute of Technology | And 5 more authors.
ISEC 2016 - Proceedings of the 6th IEEE Integrated STEM Education Conference | Year: 2016

This paper describes components and outcomes of an interdisciplinary undergraduate research program intended to motivate female students to graduate with STEM degrees. This year, the program graduated the first student, who is the first STEM graduate in her family. The program is intended to inspire underrepresented undergraduate students to graduate with STEM bachelor's degrees by providing participating students with unique mentorship from distinguished leaders in STEM fields while the students simultaneously pursue technical research. The mentorship is provided to the students when they identify and interview leaders whose careers align with the desired career fields of the students. The interviews are conducted in collaboration with the IEEE History Center and American Institute of Physics. Research results produced by the students are presented at national conferences and published in conference proceedings. Transcripts of the interviews are published in perpetuity on the IEEE Engineering Technology and History Wiki. The project will continue within the STEM environment. © 2016 IEEE. Source


Sojer M.,Bain and Company | Henkel J.,TU Munich
Communications of the ACM | Year: 2011

Reusing existing software artifacts when developing new software is an attractive way to reduce development costs and time to market while improving software quality.4 Code is the artifact most commonly reused in software development.16 Researchers have identified such reuse in commercial software development as a new facet of software reuse.13,22 Here, "Internet code" means code in the form of components (such as a library encapsulating required functionality) and snippets (such as containing a synchronization block) that can be downloaded from the Internet for free and without individual agreement with the originator; an important instance of such code is publicly available open source software (OSS). Internet code generally © 2011 ACM. Source


Guille C.,Bain and Company | Gross G.,University of Illinois at Urbana - Champaign
2010 IREP Symposium - Bulk Power System Dynamics and Control - VIII, IREP2010 | Year: 2010

The rising energy independence and environmental concerns are key drivers in the growing popularity of plug-in hybrid cars (PHEVs). Studies indicate that for 90 % of the Americans who use their cars to get to work every day, the daily commute distance is less than 50 km - or 30 miles - and, on the average, the commuter car remains parked is about 22 hours per day. All the PHEVs have in common the batteries, which provide storage capability that can be effectively harnessed when the vehicles are integrated into the grid. Such storage capability can be used to effectively integrate wind power into the grid. By nature, wind power is intermittent which raises many challenges for the grid operator. The utilization of the storage from the PHEVs enables the power system operator to smooth out the output of the wind farms by storing energy when the wind power output is too high and releasing such energy when the power output is too low. We develop a probabilistic model to take into account the effect of the variability in the PHEV owner behavior and the fact that the PHEVs are not always plugged into the grid. The numerical studies show the positive levelization impact PHEVs can have on wind power operations when grouped in aggregations of large size. ©2010 IEEE. Source

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