检索结果-内蒙古大学图书馆

41st International Conference on Parallel Processing Workshops, ICPPW 2012

作者： Rinke, Sebastian Becker, Daniel Lippert, Thomas Prabhakaran, Suraj Westphal, Lidia Wolf, Felix Laboratory for Parallel Programming German Research School for Simulation Sciences 52062 Aachen Germany Department of Computer Science RWTH Aachen University 52062 Aachen Germany Corporate Technology Siemens AG 81739 München Germany Jülich Supercomputing Centre 52428 Jülich Germany MAGMA Giessereitechnologie GmbH 52072 Aachen Germany

ISBN: (纸本)9780769547954

Accelerators such as graphics processing units (GPUs) provide an inexpensive way of improving the performance of cluster systems. In such an arrangement, the individual nodes of the cluster are directly connected to one or more accelerator devices via PCI Express. This results in a static mapping of accelerators onto compute nodes, where each accelerator can only be accessed from exactly one compute node. While this static mapping enables efficient data transfers between a given accelerator and the compute node it belongs to, differing computational demands across jobs may, however, produce either underutilized accelerators or nodes whose computational demands cannot be satisfied with the number of accelerators available to them. In particular, smaller numbers of GPUs available per node may enforce explicit MPI parallelism across compute nodes where it is not necessary. To address this limitation, we propose a novel accelerator-cluster architecture in which network-attached accelerators are dynamically assigned to compute nodes. This allows not only their optimal utilization but also a more precise match between application requirements and accelerator hardware. We outline the general concept of our dynamic architecture and show that it can offer substantial benefits to certain classes of applications without significantly harming the performance of others. © 2012 IEEE.

关键词： Memory architecture

来源：评论

学校读者我要写书评

暂无评论

Security goals assurance based on software active monitoring

Security goals assurance based on software active monitoring

引用

International Conference on Secure Software Integration and Reliability Improvement

作者： Zhao, Changzhi Dong, Wei Leucker, Martin Qi, Zhichang Department of Computer Science National University of Defense Technology Changsha 410073 China Institute of Software Technology and Programming Languages University of Lubeck Germany

ISBN: (纸本)9780769544533

Access control is a vital security mechanism in today's operating systems and the security policies dictating the security relevant behaviors is lengthy and complex for example in Security-Enhanced Linux (SELinux). It is extremely difficult to verify the consistency between the security policies and the security goals desired by applications. In this paper we present how to predict whether the information flow security goal is violated or not during runtime how to generate the corresponding control actions on-line when divergence is detected and how to apply these actions in time based on software active monitoring technique. The symbolic security information flow model of SElinux is generated from a formalization of the access control mechanism which can be used to generate the N-step ahead projection of the future behavior. Information flow security goals are expressed in linear temporal logic (LTL) which provides clear description of the objectives desired by applications. Anticipatory monitor is generated from LTL formula automatically. We consider an on-line scheme where after the occurrence of an event, the next control action is determined on the basis of the N-step ahead projection of the future behavior. This procedure is repeated after the occurrence of next security relevant event. Thus a closed-loop system is generated that all behavior sequences will satisfy the security goals. © 2011 IEEE.

关键词： Access control

来源：评论

学校读者我要写书评

暂无评论

Resource-aware programming and simulation of MPSoC architectures through extension of X10 11

Resource-aware programming and simulation of MPSoC architect...

引用

Proceedings of the 14th International Workshop on Software and Compilers for Embedded Systems

作者： Hannig, Frank Roloff, Sascha Snelting, Gregor Teich, Jürgen Zwinkau, Andreas Hardware/Software Co-Design Department of Computer Science University of Erlangen Nuremberg Germany Programming Paradigms Group Karlsruhe Institute of Technology - KIT Germany

ISBN: (纸本)9781450307635

The efficient use of future MPSoCs with f 000 or more processor cores requires new means of resource-aware programming to deal with increasing imperfections such as process variation, fault rates, aging effects, and power as well as thermal problems. In this paper, we apply a new approach called invasive computing that enables an application programmer to spread computations to processors deliberately and on purpose at certain points of the program. Such decisions can be made depending on the degree of application parallelism and the state of the underlying resources such as utilization, load, and temperature. The introduced programming constructs for resource-aware programming are embedded into the parallel computing language X10 as developed by IBM using a library-based approach. Moreover, we show how individual heterogeneous MPSoC architectures may be modeled for subsequent functional simulation by defining compute resources such as processors themselves by lightweight threads that are executed in parallel together with the application threads by the X10 run-time system. Thus, the state changes of each hardware resource may be simulated including temperature, aging, and other useful monitor functionality to provide a first high-level programming test-bed for invasive computing. Copyright © 2011 ACM.

关键词： Parallel processing systems

来源：评论

学校读者我要写书评

暂无评论

Information System for Administrative Services of Educational Process

引用

computer technology and Application 2011年第5期2卷 354-357页

作者： Lyudmilla Yordanova Stoyanova Department of Programming and Computer Technology Faculty of Computer Systems and Control Technical University of SofiaSofia 1000 Bulgaria

The goal of this paper is to analyze and propose a reconstruction of functional possibilities and database requirements of a Web based Educational Information system. For the research the Information system of the technology School ＂electronic Systems＂（TUES） associated with the Technical University of Sofia is on focus. The modules for admission of students, specialty classification, and graduation of students, management of the student＇s work in computer classrooms and lecturers＇ data management have been analyzed, developed and implemented. The additionally developed modules concern mainly the management of educational process and do not affect the e-learning or the official part modules. That led to the idea that the functionality for managing educational process has to be organized in a separate module defined as module for administrative services of educational process. Such restructuring of the system will bring flexibility in further growth of the system--for example students＇ admission or selection for different purposes.

关键词： Information systems functional structure database education.

来源：评论

学校读者我要写书评

暂无评论

Security Goals Assurance Based on Software Active Monitoring

Security Goals Assurance Based on Software Active Monitoring

引用

International Conference on Secure System Integration and Reliability Improvement, SSIRI

作者： Changzhi Zhao Wei Dong Martin Leucker Zhichang Qi Department of Computer Science National University of Defense Technology Changsha China Institute of Software Technology and Programming Languages University of Lübeck Germany

Access control is a vital security mechanism in today's operating systems, and the security policies dictating the security relevant behaviors is lengthy and complex, for example in Security-Enhanced Linux (SELinux). It is extremely difficult to verify the consistency between the security policies and the security goals desired by applications. In this paper, we present how to predict whether the information flow security goal is violated or not during runtime, how to generate the corresponding control actions on-line when divergence is detected and how to apply these actions in time based on software active monitoring technique. The symbolic security information flow model of SElinux is generated from a formalization of the access control mechanism which can be used to generate the N-step ahead projection of the future behavior. Information flow security goals are expressed in linear temporal logic (LTL) which provides clear description of the objectives desired by applications. Anticipatory monitor is generated from LTL formula automatically. We consider an on-line scheme where after the occurrence of an event, the next control action is determined on the basis of the N-step ahead projection of the future behavior. This procedure is repeated after the occurrence of next security relevant event. Thus, a closed-loop system is generated that all behavior sequences will satisfy the security goals.

关键词： Context Monitoring Semantics Access control Cost accounting Syntactics

来源：评论

学校读者我要写书评

暂无评论

Fast RNA structure alignment for crossing input structures

Fast RNA structure alignment for crossing input structures

引用

作者： Backofen, Rolf Landau, Gad M. Möhl, Mathias Tsur, Dekel Weimann, Oren Bioinformatics Institute of Computer Science Albert-Ludwigs-Universität Freiburg Germany Department of Computer Science University of Haifa Haifa 31905 Israel Department of Computer Science and Engineering NYU-Poly Six MetroTech Center Brooklyn NY 11201-3840 United States Programming Systems Lab Saarland University Saarbrücken Germany Ben-Gurion University Beer-Sheva Israel Massachusetts Institute of Technology Cambridge MA 02139 United States

The complexity of pairwise RNA structure alignment depends on the structural restrictions assumed for both the input structures and the computed consensus structure. For arbitrarily crossing input and consensus structures, the problem is NP-hard. For non-crossing consensus structures, Jiang et al.'s (2002) [9] algorithm computes the alignment in O(n2m2) time where n and m denote the lengths of the two input sequences. If the input structures are also non-crossing, the problem corresponds to tree editing which can be solved in O(m2n(1+lognm)) time (Demaine et al., 2007) [3]. We present a new algorithm that solves the problem for d-crossing structures in O(dm2nlogn) time, where d is a parameter that is one for non-crossing structures, bounded by n for crossing structures, and much smaller than n on many practical examples. Crossing input structures allow for applications where the input is not a fixed structure but is given as base-pair probability matrices. © 2010 Elsevier B.V. All rights reserved.

关键词： RNA

来源：评论

学校读者我要写书评

暂无评论

Extraction of human mandible bones from multi-slice computed tomographic data

Extraction of human mandible bones from multi-slice computed...

引用

Middle East Conference on Biomedical Engineering (MECBME)

作者： Tamer M. Nassef Nahed H. Solouma Mohamed Alkhodary Mona K. Marei Yasser M. Kadah Computer and Programming Engineering Department Misr University for Science and Technology Six of October City Egypt Tissue Engineering Laboratory Alexandria University Alexandria Egypt National Institute of Laser Science Cairo University Giza Egypt Biomedical Engineering Department Cairo University Giza Egypt

A new approach for segmenting different anatomical regions in dental Computed Tomography (CT) studies is presented in this paper. It is expected that the proposed approach will help automate different tissues regions by providing initial boundary points for deformable models or seed points for split and merge segmentation algorithms. Preliminary results obtained for dental CT studies of dentate and edentulous human-mandible are presented with finite element models divided by tetrahedral elements, which built based on actual CT data combined with triangulation equations. Identification of different anatomical regions set for mandible cortical and cancellous bones by generated 3D models by marching cubes technique.

关键词： Finite element methods Computed tomography Implants Image segmentation Three dimensional displays Dentistry Solid modeling

来源：评论

学校读者我要写书评

暂无评论

computer assisted determination of mandibular cystic lesion volume from computed tomographic data

Computer assisted determination of mandibular cystic lesion ...

引用

Middle East Conference on Biomedical Engineering (MECBME)

作者： Tamer M. Nassef Reham M. Fliefel Mona K. Marei Nahed H. Solouma Yasser M. Kadah Computer and Programming Engineering Department Misr University for Science and Technology Six of October City Egypt Tissue Engineering Lab Alexandria University Alexandria Egypt National Institute of Laser Science Cairo University Giza Egypt Biomedical Engineering Department Cairo University Giza Egypt

In this paper, a new approach for computing different anatomical regions in dental Computed Tomography (CT) is presented. The approach consists of two steps. First, a HU threshold window sets to separate between different regions upon their gray-level values; second, a set of objects are generated and texture descriptors are calculated for selected windows from the image data sample. Finally, identification of different anatomical regions set for mandible bones to determine the cystic lesion volume based on numerical methods. Preliminary results obtained for dental CT of female patient aged 14 years old complaining of bilateral swelling in her mandible are presented.

关键词： Bones Lesions Computed tomography Three dimensional displays Pixel Surgery Solid modeling

来源：评论

学校读者我要写书评

暂无评论

A filtered tuning method for a GPC controller

A filtered tuning method for a GPC controller

引用

IET Irish Signals and Systems Conference, ISSC 2010

作者： Schwarz, M.H. Cox, C.S. Börcsök, J. Department of Computer Architecture and System Programming Safety Computer Technology University of Kassel Kassel Germany Control Systems Centre University of Sunderland Sunderland United Kingdom Department of Computer Architecture and System Programming University of Kassel Kassel Germany

ISBN: (纸本)9781849192521

This paper presents a new tuning method based on model parameters identified in closed-loop. For classical controllers such as PI(D) controllers a large number of simple tuning methods for various application areas exist. However, when it comes to designing a generalised predictive controller (GPC) four parameters have to be specified. To choose those parameters is not a trivial task since they are not directly related to control or regulation performance. The presented tuning method exploits model-parameters to select suitable controller parameters. Additionally, a Rhinehart filter is incorporated in the design to decrease the impact of noise, therefore, a fifth parameter has to be optimised. The proposed method has been tested in simulation and on a real system.

关键词： Controllers

来源：评论

学校读者我要写书评

暂无评论

Boolean differential calculus

Boolean differential calculus

引用

作者： Steinbach, Bernd Posthoff, Christian Department of Computer Science Software Engineering and Programming Freiberg University of Mining and Technology Germany

ISBN: (纸本)9781608451821

Boolean Differential Calculus (BDC) extends Boolean *** Boolean algebra is focused on values of logic functions,BDC allows the evaluation of changes of the function values. Such changes can be investigated between certain pairs of function values as well as regarding whole subspaces. Due to the same basic data structures, BDC can be applied to any task described by logic functions and equations together with the Boolean *** used is BDC in analysis, synthesis, and testing of digital circuits. In this chapter, we introduce basic definitions of BDC together with some typical applications.

关键词： Differentiation (calculus)

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：