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Efficient layer activation for switching context-dependent behavior

7th Joint Modular Languages Conference (JMLC 2006)

作者： Costanza, Pascal Hirschfeld, Robert De Meuter, Wolfgang Vrije Univ Brussel VIB Programming Technol Lab B-1050 Brussels Belgium Univ Potsdam Hasso Plattner Inst D-14482 Potsdam Germany

ISBN: (纸本)3540409270

Today's programming platforms do not provide sufficient constructs that allow a program's behavior to depend on the context in which it is executing. This paper presents the design and implementation of programming language extensions that explicitly support our vision of Context-oriented programming. In this model, programs can be partitioned into layers that can be dynamically activated and deactivated depending on their execution context. Layers are sets of partial program definitions that can be composed in any order. Context-oriented programming encourages rich, dynamic modifications of program behavior at runtime, requiring an efficient implementation. We present a dynamic representation of layers that yields competitive performance characteristics for both layer activation/deactivation and overall program execution. We illustrate the performance of our implementation by providing an alternative solution for one of the prominent examples of aspect-oriented programming.

关键词： Context sensitive languages

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Equivalency of nuclear transfer-derived embryonic stem cells to those derived from fertilized mouse blastocysts

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STEM CELLS 2006年第9期24卷 2023-2033页

作者： Wakayama, Sayaka Jakt, Martin L. Suzuki, Masako Araki, Ryoko Hikichi, Takafusa Kishigami, Satoshi Ohta, Hiroshi Van Thuan, Nguyen Mizutani, Eiji Sakaide, Yuko Senda, Sho Tanaka, Satoshi Okada, Mitsuhiro Miyake, Masashi Abe, Masumi Nishikawa, Shin-Ichi Shiota, Kunio Wakayama, Teruhiko RIKEN Ctr Dev Biol Lab Genom Programming Kobe Hyogo Japan Kobe Univ Grad Sch Sci & Technol Dept Life Sci Kobe Hyogo Japan Ctr Dev Biol Lab Stem Cell Biol Kobe Hyogo Japan Univ Tokyo Tokyo Japan Natl Inst Radiol Sci Transcriptone Res Ctr Chiba 260 Japan Tohoku Univ Grad Sch Agr Sci Sendai Miyagi 980 Japan

Therapeutic cloning, whereby nuclear transfer (NT) is used to generate embryonic stem cells (ESCs) from blastocysts, has been demonstrated successfully in mice and cattle. However, if NT-ESCs have abnormalities, such as those associated with the offspring produced by reproductive cloning, their scientific and medical utilities might prove limited. To evaluate the characteristics of NT-ESCs, we established more than 150 NT-ESC lines from adult somatic cells of several mouse strains. Here, we show that these NT-ESCs were able to differentiate into all functional embryonic tissues in vivo. Moreover, they were identical to blastocyst-derived ESCs in terms of their expression of pluripotency markers in the presence of tissue-dependent differentially DNA methylated regions, in DNA microarray profiles, and in high-coverage gene expression profiling. Importantly, the NT procedure did not cause irreversible damage to the nuclei. These similarities of NT-ESCs and ESCs indicate that murine therapeutic cloning by somatic cell NT can provide a reliable model for preclinical stem cell research.

关键词： nuclear transfer cloning embryonic stem reprogramming

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A comparison of parallelization and performance optimizations for two Ray-tracing applications

A comparison of parallelization and performance optimization...

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20th European Conference on Modelling and Simulation

作者： Yang, Chen Chen, Yongjian Fu, Xiong Lim, Chu-Cheow Ju, Roy MTL Programming Syst Lab Intel China Res Ctr 8FRaycom Infotech Pk A2 KeXue Yuan S Rd Beijing 100086 Peoples R China Univ Sci & Technol China Dept Comp Sci & Technol Hefei 230027 Peoples R China Intel SSG Developer Prod Div Santa Clara CA 95052 USA Google Inc Mountain View CA 94043 USA

ISBN: (纸本)0955301807

Ray-tracing is a compute-intensive technique to render three-dimensional graphics and is embarrassingly parallel. There are many examples of ray-tracing applications from both academic and public domain projects. We ask if the parallelization and optimization issues are similar. This paper uses two sequential ray-tracing applications (POV-Ray (Persistence of Vision Raytracer) and PBRT (Physically-based Ray Tracer)) to compare the issues. We describe every step of the process, from parallelization, debugging/verification to optimization of the parallelized codes. We use a performance model of the applications to guide us on the speedups' predicted upper bounds. We also profile the execution characteristics of both applications in their final optimized version. The general experience is that POV-Ray needed more efforts to parallelize and debug than PBRT, but less efforts to optimize.

关键词： Ray-tracing POV-Ray PBRT parallelization performance analysis

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A model curriculum for aspect-oriented software development

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IEEE SOFTWARE 2006年第6期23卷 53-+页

作者： Brichau, Johan Chitchyan, Ruzanna Garcia, Alessandro Rashid, Awais Clarke, Siobhan D'Hondt, Ellie Haupt, Michael Joosen, Wouter Katz, Shmuel Noye, Jacques Suedholt, Mario Univ Sci & Technol Lille LIFL INRIA JACQUARD Project F-59655 Villeneuve Dascq France Vrije Univ Brussel Programming Technol Lab Brussels Belgium Univ Lancaster Dept Comp InfoLab21 Off C54 Lancaster LA1 4WA England Univ Dublin Trinity Coll Dept Comp Sci Dublin 2 Ireland Vrije Univ Brussel Dept Math B-1050 Brussels Belgium Tech Univ Darmstadt Darmstadt Germany Katholieke Univ Leuven Dept Comp Sci B-3000 Louvain Belgium Technion Israel Inst Technol Dept Comp Sci IL-32000 Haifa Israel Ecole Mines Nantes Dept Informat F-44307 Nantes 3 France

A model postgraduate curriculum for aspect-oriented software development has been derived from the practical experience of running postgraduate courses at nine institutions across Europe (part of the European Network of Excellence on AOSD). Several institutions have made concrete instantiations of the curriculum, from a summer school to a university master's degree course. The curriculum also relates to the Software Engineering Body of Knowledge.

关键词： Computer Science Education Object Oriented programming Software Engineering Training Aspect Oriented Software Development Model Curriculum Software Engineering Training Undergraduate Curricula programming Software Engineering Application Software Industrial Training Guidelines Education Computer Industry Mining Industry Curriculum Development Educational Institutions Computer Science Education Aspect Oriented Software Development Curriculum

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Challenges and opportunities on multi-core microprocessor

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10th Asia-Pacific Conference on Advances in Computer Systems Architecture

作者： Fang, J Intel Corp Programming Syst Lab Microprocessor Technol Labs Technol Grp Santa Clara CA 95051 USA

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SelfSync: A dynamic round-trip engineering environment 05

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8th International Conference on Model Driven Engineering Languages and Systems

作者： Van Paesschen, E De Meuter, W D'Hondt, M Free Univ Brussels Programming Technol Lab B-1050 Brussels Belgium Univ Sci & Technol Lille Lab Informat Fondamentale Lille F-59655 Villeneuve Dascq France

ISBN: (纸本)3540290109

Model-Driven Engineering (MDE) advocates the generation of software applications from models, which are views on certain aspects of the software. In this paper, we focus on a particular setup which consists of a graphical data modeling view and a view on an object-oriented implementation, which can be either textual or graphical. A challenge that arizes in the context of MDE is the notion of Round-Trip Engineering (RTE), where elements from both views can be manipulated and thus need to be synchronized. We systematically identify four fundamental RTE scenarios. In this paper, we employ the framework of these scenarios for explaining SelfSync, our approach and tool for providing dynamic support for RTE. In SelfSync, the entities of the data modeling view and the corresponding implementation objects are one and the same. Additionally, we present a comparison with related work accompanied by an extensive discussion.

关键词： Computer software

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KERIS: evolving software with extensible modules

KERIS: evolving software with extensible modules

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ECOOP 2000 Workshop

作者： Zenger, M Swiss Fed Inst Technol Programming Methods Lab Sch Comp & Commun Sci INR Ecublens CH-1015 Lausanne Switzerland

We present the programming language KERIS, an extension of Java with explicit support for software evolution. KERIS introduces extensible modules as the basic building blocks for software. Modules are composed hierarchically, explicitly revealing the architecture of systems. A distinct feature of the module design is that modules do not get linked manually. Instead, the wiring of modules gets inferred. The module assembly and refinement mechanism of KERIS is not restricted to the unanticipated extensibility of atomic modules. It also allows extensions of already linked systems by replacing selected submodules with compatible versions without needing to re-link the full system. Extensibility is type-safe and noninvasive, i.e., the extension of a module preserves the original version and does not require access to source code. Copyright (c) 2005 John Wiley & Sons, Ltd.

关键词： module systems component-oriented programming software reuse extensibility unanticipated software evolution module refinement module specialization

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Towards Abstract Interpretation for Recovering Design Information

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ELECTRONIC NOTES IN THEORETICAL COMPUTER SCIENCE 2005年 131卷 15-25页

作者： De Roover, Coen Gybels, Kris D'Hondt, Theo Vrije Univ Brussel Programming Technol Lab Brussels Belgium

It is a well-known problem that design information of object-oriented programs is often lost or is not kept up-to-date when the program evolves. This design information can be recovered from the program using such techniques as logic meta programming. In this technique logic queries are used to check whether the program is implemented along certain well-known patterns. Currently the technique relies on structural information and patterns are expressed in the queries as conditions over structural elements of the program. Some patterns are however better expressed in dynamic terms which requires behavioural information about the program. Such information can be obtained from execution traces of the program, but these record only one possible input dependent program execution out of many. Abstract interpretation of the object-oriented program could provide a well-founded means for extracting the necessary behavioural information.

关键词： logic meta programming design recovery dynamic analysis abstract interpretation

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On the use of clone detection for identifying crosscutting concern code

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IEEE TRANSACTIONS ON SOFTWARE ENGINEERING 2005年第10期31卷 804-818页

作者： Bruntink, M van Deursen, A van Engelen, R Tourwé, T CWI Dept Software Engn NL-1098 SJ Amsterdam Netherlands Delft Univ Technol Fac Elect Engn Math & Comp Sci NL-2628 CD Delft Netherlands ASML Netherlands BV Software Syst Dev NL-5504 DR Veldhoven Netherlands Vrije Univ Brussels Programming Technol Lab B-1050 Brussels Belgium

In systems developed without aspect-oriented programming, code implementing a crosscutting concern may be spread over many different parts of a system. Identifying such code automatically could be of great help during maintenance of the system. First of all, it allows a developer to more easily find the places in the code that must be changed when the concern changes and, thus, makes such changes less time consuming and less prone to errors. Second, it allows the code to be refactored to an aspect-oriented solution, thereby improving its modularity. In this paper, we evaluate the suitability of clone detection as a technique for the identification of crosscutting concerns. To that end, we manually identify five specific crosscutting concerns in an industrial C system and analyze to what extent clone detection is capable of finding them. We consider our results as a stepping stone toward an automated "aspect miner" based on clone detection.

关键词： clone detection reverse engineering aspect-oriented programming crosscutting concerns aspect mining

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KERIS: evolving software with extensible modules

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JOURNAL OF SOFTWARE MAINTENANCE AND EVOLUTION-RESEARCH AND PRACTICE 2005年第5期17卷 333-362页

作者： Zenger, M Swiss Fed Inst Technol Programming Methods Lab Sch Comp & Commun Sci INR Ecublens CH-1015 Lausanne Switzerland

关键词： module systems component-oriented programming software reuse extensibility unanticipated software evolution module refinement module specialization

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