检索结果-南通市图书馆

Dynamic Analysis of the Biped Ice-skater Robot of Passive Wheel Type

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2008年第1期13卷 122-128页

作者：徐子力吕恬生田华徐振华宋立博 School of Mechanical Engineering Shanghai Jiaotong University hewlett-packard Technology Shanghai Co.Ltd.

A new passive wheel type of biped ice-skater robot (BISR) subjected to nonholonomic constraints was presented on the basis of ice-skating principle. Its motion principle and construction were discussed. After the model was simplified and the coordinate systems were established, the motion differential equations of the robot were obtained with the generalized Lagrange-Maggi equation when the nonholonomic constraints existed. Actual examples were given and the result was simulated on computer.

关键词：动态分析法机器人自动化技术计算机技术

A new method of complicated folded fabric modeling

在线全文

学校读者我要写书评

暂无评论

Journal of Harbin Institute of Technology(New Series) 2012年第2期19卷 43-46页

作者：程涵余莉殷柱伟 College of Aerospace Engineering Nanjing University of Aeronautics and Astronautics Test Center of Expertise Hewlett-Packard Company

In order to resolve the complicated folded fabric modeling problem and establish the high quality finite element model for fabric working simulation in aviation or aerospace area,the Fluid Structure Interaction(FSI) method based on Arbitrary Lagrangian Eulerian(ALE) coupling theory was applied for modeling in this *** expanded three-dimensional fabric model(a special airbag) was divided into several *** the folded state of each was calculated based on this numerical *** last,the completely folded finite element model was *** method can effectively simulate the complicated and natural folds,and the quality of model is very high which can greatly improve the success rate of fabric working process *** method also can be guidance for other kinds of folded fabric modeling.

关键词： fabric fold ALE FSI inflatable structure

Reflections on the security proofs of Boneh-Franklin identity-based encryption scheme

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2013年第7期56卷 1385-1401页

作者： CHEN Yu CHEN LiQun LIN DongDai State Key Laboratory of Information Security (SKLOIS) Institute of Information Engineering Chinese Academy of Sciences hewlett packard labs Long Down Avenue Stoke Gifford Bristol BS34 8QZ UK

In this paper, we first review the existing proofs of the Boneh-Franklin identity-based encryption scheme (BF-IBE for short), and show how to admit a new proof by slightly modifying the specifications of the hash functions of the original BF-IBE. Compared with prior proofs, our new proof provides a tighter security reduction and minimizes the use of random oracles, thus indicates BF-IBE has better provable security with our new choices of hash functions. The techniques developed in our proof can also be applied to improving security analysis of some other IBE schemes. As an independent technical contribution, we also give a rigorous proof of the Fujisaki-Okamoto (FO) transformation in the case of CPA-to-CCA, which demonstrates the efficiency of the FO-transformation (CPA-to-CCA), in terms of the tightness of security reduction, has long been underestimated. This result can remarkably benefit the security proofs of encryption schemes using the FO-transformation for CPA-to-CCA enhancement.

关键词：可证明安全性加密方案富兰克林安全性分析散列函数哈希函数松紧程度 IBE

Study and Development of the Biped Ice Skating Robot with Passive Wheels

在线全文

学校读者我要写书评

暂无评论

Journal of Shanghai Jiaotong university(Science) 2007年第6期12卷 780-786页

作者：徐子力吕恬生田华徐振华宋立博 School of Mechanical Eng. Shanghai Jiaotong Univ. hewlett-packard Tech. Shanghai Co.Ltd.

A new passive wheel type of biped ice-skating robot(BISR)which was able to imitate human skating motion was developed. Firstly, the characteristics of two types of human skating gait were introduced; secondly, after simplifying the kinematical model, the BISR's motion principle was presented; then the construction and control system of BISR were proposed; at last, the skating experiment of the BISR in a symmetric gait mode was conducted and some conclusions were drawn.

关键词： biped ice-skating robot(BISR) gait plan kinematics mapping control system

A Semantic Searching Scheme in Heterogeneous Unstructured P2P Networks

在线全文

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2011年第6期26卷 925-941页

作者：黄俊成李秀琦吴杰 ACM IEEE Shanghai hewlett-packard Co. Ltd. Department of Computer Science and Mathematics University of North Carolina at Pembroke Department of Computer and Information Sciences Temple University

Semantic-based searching in peer-to-peer （P2P） networks has drawn significant attention recently. A number of semantic searching schemes, such as GES proposed by Zhu Y et al., employ search models in Information Retrieval （IR）. All these IR-based schemes use one vector to summarize semantic contents of all documents on a single node. For example, GES derives a node vector based on the IR model： VSM （Vector Space Model）. A topology adaptation algorithm and a search protocol are then designed according to the similarity between node vectors of different nodes. Although the single semantic vector is suitable when the distribution of documents in each node is uniform, it may not be efficient when the distribution is diverse. When there are many categories of documents at each node, the node vector representation may be inaccurate. We extend the idea of GES and present a new class-based semantic searching scheme （CSS） specifically designed for unstructured P2P networks with heterogeneous single-node document collection. It makes use of a state-of-the-art data clustering algorithm, online spherical k-means clustering （OSKM）, to cluster all documents on a node into several classes. Each class can be viewed as a virtual node. Virtual nodes are connected through virtual links. As a result, the class vector replaces the node vector and plays an important role in the class-based topology adaptation and search process. This makes CSS very efficient. Our simulation using the IR benchmark TREC collection demonstrates that CSS outperforms GES in terms of higher recall, higher precision, and lower search cost.

关键词： class-based search GES semantic clustering topology adaptation P2P networks

Recent Progress in Heterogeneous Ⅲ-Ⅴ-on-Silicon Photonic Integration

在线全文

学校读者我要写书评

暂无评论

Light(Advanced Manufacturing) 2021年第1期2卷 51-75页

作者： Di Liang John E.Bowers hewlett packard labs Hewlett Packard Enterprise6280 American Center DriveSan JoseCA 94088USA Department of Electrical and Computer Engineering University of CaliforniaSanta BarbaraCA 93106USA

Silicon(Si)photonics is a disruptive technology on the fast track to revolutionise integrated *** indispensable branch thereof,heterogeneous Si integration,has also evolved from a science project 15 years ago to a growing business and compelling research field *** focus on the scope of Ⅲ-Ⅴ compound semiconductors heterogeneously integrated on Si *** commercial success of massively produced integrated optical transceivers based on first-generation innovation is ***,we review a number of technological breakthroughs at the component and platform *** addition to the numerous new device performance records,our emphasis is on the rationale behind and the design principles underlying specific examples of materials and device ***,we offer perspectives on development trends catering to the increasing demand in many existing and emerging applications.

关键词： Silicon breakthrough Integration

Design and Implementation of an Extended Collectives Library for Unified Parallel C

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2013年第1期28卷 72-89页

作者： Carlos Teijeiro Guillermo L.Taboada Juan Tourio Ramón Doallo Jos C.Mourio Damivn A.Mallón Brian Wibecan Computer Architecture Group University of A Corua Galicia Supercomputing Center Jlich Supercomputing Centre Institute for Advanced SimulationForschungszentrum Jlich Industry Standard Servers Group Hewlett-Packard Company

Unified Parallel C （UPC） is a parallel extension of ANSI C based on the Partitioned Global Address Space （PGAS） programming model, which provides a shared memory view that simplifies code development while it can take advantage of the scalability of distributed memory architectures. Therefore, UPC allows programmers to write parallel applications on hybrid shared/distributed memory architectures, such as multi-core clusters, in a more productive way, accessing remote memory by means of different high-level language constructs, such as assignments to shared variables or collective primitives. However, the standard UPC collectives library includes a reduced set of eight basic primitives with quite limited functionality. This work presents the design and implementation of extended UPC collective functions that overcome the limitations of the standard collectives library, allowing, for example, the use of a specific source and destination thread or defining the amount of data transferred by each particular thread. This library fulfills the demands made by the UPC developers community and implements portable algorithms, independent of the specific UPC compiler/runtime being used. The use of a representative set of these extended collectives has been evaluated using two applications and four kernels as case studies. The results obtained confirm the suitability of the new library to provide easier programming without trading off performance, thus achieving high productivity in parallel programming to harness the performance of hybrid shared/distributed memory architectures in high performance computing.

关键词： Unified Parallel C collective operation programmability partitioned global address space high performance computing

Memory that never forgets:emerging nonvolatile memory and the implication for architecture design

在线全文

学校读者我要写书评

暂无评论

National Science Review 2018年第4期5卷 577-592页

作者： Guangyu Sun Jishen Zhao Matt Poremba Cong Xu Yuan Xie Center for Energy-Efficient Computing and Applications School of Electronics Engineering and Computer Science Peking University Department of Computer Engineering University of California at Santa Cruz Advanced Micro Devices Inc. hewlett packard Lab Department of Electrical and Computer Engineering University of California at Santa Barbara

In order to mitigate the problem of the ‘memory wall’, various emerging nonvolatile memory(NVM)technologies have been proposed to replace the traditional ones. These emerging NVMs include spin torque transfer random access memory, PCRAM, resistive random access memory, racetrack memory, *** to traditional memory technologies, they have the advantages of near-zero standby power, high storage density and nonvolatility, which make them competitive for future memory hierarchy ***, it is inefficient to directly apply these NVMs in existing memory architectures. On the one hand,these NVMs have their own limitations, such as long write latency, high write energy, limited write numbers, etc. Thus, proper architecture modification is required to adopt them into the traditional memory hierarchy. On the other hand, the unique features of these NVMs allow new memory architectures in memory subsystems and also introduce new challenges to be solved at the same time. In this paper, we not only review various emerging NVMs but also study typical related work on these topics to investigate their implications for memory architecture design.

关键词： non-volatile memory cache main memory energy efficiency

New Value Chain through Service Platform

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

New Value Chain through Service Platform