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30th IEEE Intelligent Vehicles Symposium (IV)

作者： Hellwig, Alexander David Kriebel, Stefan Kusmenko, Evgeny Rumpe, Bernhard Rhein Westfal TH Aachen Fac Comp Sci Dept Software Engn Ahornstr 55 D-52074 Aachen Germany BMW Grp Munich Germany

ISBN: (纸本)9781728105604

Mapping the logical software architecture of a vehicle to a technical solution is not a straightforward task. A particular challenge is communication: software components developed by different teams and deployed across the E/E architecture need to be able to exchange data. Middleware solutions have been developed to enable low coupling of distributed logical software components. Building a distributed architecture on a middleware solution is mostly accomplished by encapsulating logical components into middleware wrappers. This is not only time-consuming, but also requires platform specific understanding, and results in a multitude of architectural variants tailored for particular set-ups. For instance, lengthy validation processes ensuring functional correctness and safety require simulations of intelligent vehicle systems in different simulators, environments, and on different abstraction levels. This leads to the necessity of individual integration schemes for both simulation and deployment. We propose a component-based modeling approach separating platform agnostic logical models from middleware aspects. Therefore, the model compiler is instrumented with middleware tags related to the elements of the logical model. Generating the required middleware code automatically, we aim at better component re-usability minimizing the need for hand-crafted glue-code for interprocess and simulator integration.

关键词： control engineering computing embedded systems formal specification middleware object-oriented programming software architecture traffic engineering computing Middleware control engineering computing Software architecture object oriented programming Embedded systems engineering computing logical Formal specifications ARCHITECTURE vehicle

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object-oriented time-domain simulation framework for Remotely Operated Vehicles 4

Object-oriented time-domain simulation framework for Remotel...

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IEEE 4th Colombian Conference on Automatic Control (CCAC) - Automatic Control as Key Support of Industrial Productivity

作者： Ramirez-Macias, Juan A. Vasquez, Rafael E. Saevik, Svein Sorensen, Asgeir J. Univ Pontificia Bolivariana Automat & Design Grp A D Dept Mech Engn Medellin Colombia Norwegian Univ Sci & Technol Ctr Autonomous Marine Operat & Syst Dept Marine Technol Trondheim Norway

ISBN: (纸本)9781538669624

This work addresses the development of an object oriented time-domain simulation framework for Remotely Operated Vehicles (ROVs). Kinematics, dynamics, and control for ROVs are first presented using Newtonian mechanics' equations which account for rigid-body motion, hydrodynamics, actuator, control, and cable effects;thrust allocation and control algorithms are presented as important components of the feedback control schemes. Then, time domain-simulation is conceptualized under the idea of object-oriented programming and the proposed framework is presented as a useful tool to organize and configure different simulation scenarios in which the future behavior of the vehicle's state is predicted from known initial conditions. We later describe the simulation model of visOR3, an experimental, observation-class ROV developed in Colombia during the late 2000's. Results are shown for an open-loop with thrust allocation scenario, and show that the tailor-made simulation framework is useful for gaining insight into the ROV's maneuvering attributes. This constitutes a contribution for design and operation phases of underwater technologies such as ROV systems.

关键词： Unmanned underwater vehicles Robot motion analysis object-oriented programming

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Factors Affecting Students' Performance in Distributed Pair programming

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JOURNAL OF EDUCATIONAL COMPUTING RESEARCH 2019年第2期57卷 513-544页

作者： Xinogalos, Stelios Satratzemi, Maya Chatzigeorgiou, Alexander Tsompanoudi, Despina Univ Macedonia Dept Appl Informat Sch Informat Sci Egnatia 156 St GR-54636 Thessaloniki Greece

Pair programming has been shown to increase productivity and code quality not only in professional software development but also in the context of programming education. The provision of broadband Internet access gave rise to Distributed Pair programming (DPP) enabling two programmers to collaborate remotely. To gain insight into the benefits of DPP, we performed an empirical study on an object-oriented programming course where 62 students carried out assignments through a DPP platform. The goal of the study is to investigate, in the context of DPP, whether prior programming skills (assessed at the level of student, his or her partner and pair) and pair compatibility are related to student performance. To further examine the effect of DPP on learning outcomes, we have studied whether a pair's performance on DPP assignments is related to the students' grade. The findings indicate that the student's actual skill and the pair's actual skill affect his or her performance in an object-oriented programming course. The results also suggested that there is no association between pair compatibility and his or her own performance. Finally, pair performance on DPP assignments is related to the individual student performance in the final exams. Such evidence can be used to guide instructors when planning DPP assignments and especially when forming student pairs.

关键词： distributed pair programming collaborative learning tools object-oriented programming computer science education

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A program for Victory Boogie Woogie

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JOURNAL OF MATHEMATICS AND THE ARTS 2019年第3期13卷 261-285页

作者： Feijs, Loe M. G. Eindhoven Univ Technol Dept Ind Design POB 513Laplacebldg 1-78 NL-5600 MB Eindhoven Netherlands

The paintings of Piet Mondrian have been attractive for programmers and researchers writing programs that produce compositions resembling the originals. In earlier work published in Leonardo, a generic framework was proposed, which turned out flexible and could be adapted to generate many different Mondrian types. Until recently, there were hardly any attempts to target Mondrian's Victory Boogie Woogie, which is more difficult than most of the earlier Mondrian types. This article describes an extension of the Leonardo approach by including Victory Boogie Woogie. This work poses different challenges because of its uniqueness, its complexity and the fact that it is unfinished. In the extension, three principles for modelling and programming are used: (1) working with cells, (2) nesting, and (3) object-orientation. The program entered and won a Dutch national competition on programming Victory Boogie Woogie in 2013.

关键词： Mondrian Victory Boogie Woogie algorithmic art generative art composite pattern De Stijl object-oriented programming

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OO-VR: NUMA Friendly object-oriented VR Rendering Framework For Future NUMA-Based Multi-GPU Systems 19

OO-VR: NUMA Friendly Object-Oriented VR Rendering Framework ...

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46th International Symposium on Computer Architecture (ISCA)

作者： Xie, Chenhao Xin, Fu Chen, Mingsong Song, Shuaiwen Leon Pacific Northwest Natl Lab Richland WA 99352 USA Univ Houston Houston TX 77004 USA Univ Houston ECE Dept ECMOS Lab Houston TX 77004 USA East China Normal Univ Sch Comp Sci & Software Engn Shanghai Peoples R China Univ Sydney Sydney NSW Australia

ISBN: (纸本)9781450366694

With the strong computation capability, NUMA-based multi-GPU system is a promising candidate to provide sustainable and scalable performance for Virtual Reality (VR) applications and deliver the excellent user experience. However, the entire multi-GPU system is viewed as a single GPU under the single programming model which greatly ignores the data locality among VR rendering tasks during the workload distribution, leading to tremendous remote memory accesses among GPU models (GPMs). The limited inter- GPM link bandwidth (e.g., 64GB/s for NVlink) becomes the major obstacle when executing VR applications in the multi-GPU system. By conducting comprehensive characterizations on different kinds of parallel rendering frameworks, we observe that distributing the rendering object along with its required data per GPM can reduce the inter-GPM memory accesses. However, this object-level rendering still faces two major challenges in NUMA-based multi- GPU system: (1) the large data locality between the left and right views of the same object and the data sharing among different objects and (2) the unbalanced workloads induced by the software- level distribution and composition mechanisms. To tackle these challenges, we propose object-oriented VR rendering framework (OO-VR) that conducts the software and hardware co-optimization to provide a NUMA friendly solution for VR multi-view rendering in NUMA-based multi-GPU systems. We first propose an object-oriented VR programming model to exploit the data sharing between two views of the same object and group objects into batches based on their texture sharing levels. Then, we design an object aware runtime batch distribution engine and distributed hardware composition unit to achieve the balanced workloads among GPMs and further improve the performance of VR rendering. Finally, evaluations on our VR featured simulator show that OO-VR provides 1.58x overall performance improvement and 76% inter-GPM memory traffic reduction over the s

关键词： graphics processing units multiprocessing systems object-oriented programming parallel processing rendering (computer graphics) virtual reality Variable reluctance Multiprocessing systems object oriented programming Rendering Graphics Processing Unit locality data virtual reality PARALLEL PROCESSING (COMPUTERS) Rendering (computer graphics) Nonunified memory architecture Remote Memory object orientation

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object-oriented programming paradigm for damage tolerant evaluation of engineering structural components

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ADVANCES IN ENGINEERING SOFTWARE 2011年第1-2期42卷 12-24页

作者： Murthy, A. Rama Chandra Palani, G. S. Iyer, Nagesh R. CSIR Struct Engn Res Ctr Madras 600113 Tamil Nadu India

This paper proposes a new fracture mechanics based OOP tool for damage tolerant evaluation of cracked structural components including tubular joints subjected to constant and variable amplitude loading. To meet requirements of damage tolerant evaluation of structural components, interactive and user-friendly software, has been developed by using OOP concepts. Application of OOP concepts with class and sequence diagrams generated using unified modified language (UML) design tool has been explained with reference to the software. Graphical user interface (GUI) has been developed using VC++, which acts as a client at the front end, while the database developed using MS-ACCESS-XP acts as the server at the back-end. Database design for typical structural components with different crack configurations has been shown in the form of tables. The details of various program modules and structure of GUI have been outlined. Number of benchmark problems has been solved through GUI for verification and validation. The efficacy of the software has been illustrated through an example problem. (C) 2010 Elsevier Ltd. All rights reserved.

关键词： Damage tolerant evaluation Fracture mechanics object-oriented programming Crack growth Remaining life Residual strength

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Assessing students' understanding of object structures 19

Assessing students' understanding of object structures

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19th Koli Calling Conference on Computing Education Research (Koli Calling)

作者： Muehling, Andreas Schulte, Carsten Bennedsen, Jens Budde, Lea Grosse-Boelting, Gregor Univ Kiel Kiel Germany Univ Paderborn Paderborn Germany Aarhus Univ Aarhus Denmark

ISBN: (纸本)9781450377157

We present a theoretically derived and empirically tested competence model related to the concepts of "object state" and "references" that both form an important part of object-oriented programming. Our model characterizes different levels of programming capability with a focus on possible learning stages of beginning learners. It is based on the notion of understanding objects and their interaction with each other during the runtime of a program. Based on a hierarchical description of our theory, we derive a two-dimensional structure that separates the hierarchy into two facets "structure" (how are objects structured/stored) and "behaviour" (how do objects interact and access each other). Based on this, we have developed a set of items and collected data in a CS1 course (N = 195) to validate the item-set. We analyzed the data using a Rasch model to check item difficulty and the presence of different difficulty levels, and factor analysis to check the dimensions of the model. Furthermore, we argue for the validity of the items with the help of additional data collected from the students. The results indicate that our theoretical assumptions are correct and that the items will be usable with some minor modifications.

关键词： introductory programming object-oriented programming objecorientation assessment competence model latent-trait

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Which of My Transient Type Checks Are Not (Almost) Free? 11

Which of My Transient Type Checks Are Not (Almost) Free?

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11th ACM SIGPLAN International Workshop on Virtual Machines and Intermediate Languages (VMIL)

作者： Gariano, Isaac Oscar Roberts, Richard Marr, Stefan Homer, Michael Noble, James Victoria Univ Wellington Engn & Comp Sci Wellington New Zealand Victoria Univ Wellington Computat Media Innovat Ctr Wellington New Zealand Univ Kent Sch Comp Canterbury Kent England

ISBN: (纸本)9781450369879

One form of type checking used in gradually typed language is transient type checking: whenever an object 'flows' through code with a type annotation, the object is dynamically checked to ensure it has the methods required by the annotation. Just-in-time compilation and optimisation in virtual machines can eliminate much of the overhead of runtime transient type checks. Unfortunately this optimisation is not uniform: some type checks will significantly decrease, or even increase, a program's performance. In this paper, we refine the so called "Takikawa" protocol, and use it to identify which type annotations have the greatest effects on performance. In particular, we show how graphing the performance of such benchmarks when varying which type annotations are present in the source code can be used to discern potential patterns in performance. We demonstrate our approach by testing the Moth virtual machine: for many of the benchmarks where Moth's transient type checking impacts performance, we have been able to identify one or two specific type annotations that are the likely cause. Without these type annotations, the performance impact of transient type checking becomes negligible. Using our technique programmers can optimise programs by removing expensive type checks, and VM engineers can identify new opportunities for compiler optimisation.

关键词： dynamic type checking gradual types optional types Grace performance evaluation benchmarking object-oriented programming

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An educational tool for visualising actor programs 42

An educational tool for visualising actor programs

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42nd International Convention on Information and Communication Technology, Electronics and Microelectronics (MIPRO)

作者： Colak, Andela Cuvic, Marin Aglic Univ Split Fac Sci Split Croatia

ISBN: (纸本)9789532330984

object-oriented programming (OOP) is probably the most popular programming paradigm today. Because of this, it is often taught at faculties associated with computer science. The general idea of OOP is to break a complex problem into abstractions called objects which interact with each other via method invocation. On the other hand, the actor model provides a computation model based on agents that are called actors. Actors in the actor model are similar to objects in OOP, but unlike objects are concurrent and communicate by message passing. At our faculty, a game-based approach is used to teach students about OOP. The actors in a game can be taught as agents that interact with an environment. Furthermore, students program agent behaviour in our artificial intelligence course. Therefore, students have experience with both objects and agents. However, students still find it difficult to understand the actor model and build applications with it. In order to help students, we have developed a visualisation system for actor-based applications. We collected responses on the system after presenting it to students that were taught the model. In this paper, we i) present the developed visualisations system and ii) report the results on the responses collected.

关键词： actor model message-passing notional machine object-oriented programming program visualisation

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From Numerical Modeling to Didactic Simulation in Electromagnetism 7

From Numerical Modeling to Didactic Simulation in Electromag...

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7th Mediterranean Congress of Telecommunications (CMT)

作者： Salmi, Khalid Magrez, Hamid Taybi, Chakib Derkaoui, Abdechafik Ziyyat, Abdelhak Univ Mohammed Premier Fac Sci Elect & Syst Lab Oujda Morocco CRMEF Oriental Oujda Morocco

ISBN: (纸本)9781728144207

Supported by new technologies in education, didactic simulation has become an important research issue. It constitutes a genuine educational innovation for all training platforms. In particular, in electromagnetism and electronics, real didactic progress should be concretized by the interactive simulation of certain experiences that are often inaccessible in reality by the animated visualization of different abstract concepts. However, their design is constrained by technological choices, learning theories and numerical models which will ensure both minimal execution time, better stability and acceptable accuracy. Based on a topological approach to electromagnetism, a key to a successful numerical object-oriented method, we present a new "Element oriented Model" (EOM). This method allows to generalize the FDTD method and the non-standard NS-FDTD method and to develop two new and faster algorithms. It is thus proposed as a foundation to carry out interactive simulations that can be described as "simulated experiments" via object-oriented numerical methods.

关键词： didactic simulation numerical modeling object-oriented programming electromagnetism simulated experience

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