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Experimental Scheme of 633 nm and 1359 nm Good-Bad Cavity Dual-Wavelength Active Optical Frequency Standard

Chinese Physics Letters 2015年第8期32卷 57-61页

作者：许志超潘多庄伟陈景标 State Key Laboratory of Advanced Optical Communication System and Network Institute of Quantum Electronics School of Electronics Engineering & Computer Science Peking University Beijing 100871 National Institute of Metrology Beijing 100013

The experimental scheme of 633 nm and 1359 nm good-bad cavity dual-wavelength active optical frequency stan- dard is proposed, where He-Ne 633nm and Cs 1359nm stimulated emissions are working at good-cavity and bad-cavity regimes, respectively. The cavity length is stabilized by locking the 633nm output frequency to a super-cavity with the Pound Drever-Hall （PDH） technique. The frequency stability of 1359 nm bad-cavity stim- ulated emission output is then expected to be further improved by at least 1 order of magnitude than the 633nm PDH system due to the suppressed cavity pulling effect of active optical clock, and the quantum limited linewidth of 1359nm output is estimated to be 72.5 mHz.

关键词： length Experimental Scheme of 633 nm and 1359 nm Good-Bad Cavity Dual-Wavelength Active Optical Frequency Standard

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Locality and parallelism optimization for dynamic programming algorithm in bioinformatics

Locality and parallelism optimization for dynamic programmin...

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2006 ACM/IEEE Conference on Supercomputing, SC'06

作者： Tan, Guangming Feng, Shengzhong Sun, Ninghui Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy of Sciences Graduate School Chinese Academy of Sciences

ISBN: (纸本)0769527000

Dynamic programming has been one of the most efficient approaches to sequence analysis and structure prediction in biology. However, their performance is limited due to the drastic increase in both the number of biological data and variety of the computer architectures. With regard to such predicament, this paper creates excellent algorithms aimed at addressing the challenges of improving memory efficiency and network latency tolerance for nonserial polyadic dynamic programming where the dependences are nonuniform. By relaxing the nonuniform dependences, we proposed a new cache oblivious scheme to enhance its performance on memory hierarchy architectures. Moreover we develop and extend a tiling technique to parallelize this nonserial polyadic dynamic programming using an alternate block-cyclic mapping strategy for balancing the computational and memory load, where an analytical parameterized model is formulated to determine the tile volume size that minimizes the total execution time and an algorithmic transformation is used to schedule the tile to overlap communication with computation to further minimize communication overhead on parallel architectures. The numerical experiments were carried out on several high performance computer systems. The new cache-oblivious dynamic programming algorithm achieve 2-10 speedup and the parallel tiling algorithm with communication-computation overlapping shows a desired potential for fine-grained parallel computing on massively parallel computer systems. © 2006 IEEE.

关键词： Dynamic programming

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High-efficient architecture of Godson-T many-core processor 23

High-efficient architecture of Godson-T many-core processor

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23rd IEEE Hot Chips Symposium, HCS 2011

作者： Fan, Dongrui Zhang, Hao Wang, Da Ye, Xiaochun Song, Fenglong Zhang, Junchao Fan, Lingjun Advanced Micro-System Group National Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences China

This article consists of a collection of slides from the author's conference presentation on the special features, system design, processing capabilities, and targeted markets for AMS's Godson-T microprocessor...

ISBN: (纸本)9781467388771

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Protein structure prediction based on a domain clustering database

Protein structure prediction based on a domain clustering da...

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2007 1st International Conference on Bioinformatics and Biomedical Engineering, ICBBE

作者： Ma, Zhaoyun Zhang, Fa Xu, Lin Feng, Shengzhong Liu, Zhiyong Key Laboratory of Computer System and Architecture Chinese Academy of Sciences Institute of Computing Technology Graduate School Chinese Academy of Sciences

ISBN: (纸本)1424411203

Homology modeling, as a successful protein structure prediction method, has two major deficiencies, i.e., the lack of the templates (known structures), and the accuracy of alignment between the query (unknown structure) and its templates. To solve these problems, we have constructed a conservative domain clustering template database, and proposed a profile-based alignment algorithm based on the profile extracted from each domain clustering in the database. The extracted profile can well represent the information of the sequence and structure as well. Compared with other alignment methods, such as T-coffee and Smith-Water man, our results show that with this method it's possible to obtain a higher hit rate for template searching and a more accurate and reliable query-template alignment. Therefore, the quality of protein structure prediction can be improved. © 2007 Crown Copyright.

关键词： Proteins

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Evaluating memory compression and deduplication

Evaluating memory compression and deduplication

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2013 IEEE 8th International Conference on Networking, architecture and Storage, NAS 2013

作者： Deng, Yuhui Song, Liangshan Huang, Xinyu Computer Science Department Jinan University Guangzhou 510632 China Key Laboratory of Computer System and Architecture Chinese Academy of Sciences Beijing 100190 China

ISBN: (纸本)9780769550343

Many programs require more RAM to hold their data than a typical computer has. Theoretically, both the compression and deduplication can trade the rich computing capacity for more available RAM space. This paper comprehensively evaluates the performance behaviour of memory compression and memory deduplication by using seven real memory traces. The experimental results give two implications: (1) Memory deduplication greatly outperforms memory block compression. (2) Fixed-size partition (FSP) achieves the best performance in contrast to Content-defined Chunking (CDC) and Sliding Block (SB). The optimal chunking size of FSP is equal to the size of a memory page. The analysis results in this paper should be able to provide useful insights for designing or implementing systems that require abundant memory resources to enhance the system performance. © 2013 IEEE.

关键词： Random access storage

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FLAP: An efficient WLAN initial access authentication protocol

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IEEE Transactions on Parallel and Distributed systems 2014年第2期25卷 488-497页

作者： Li, Xinghua Bao, Fenye Li, Shuxin Ma, Jianfeng State Key Laboratory of Integrated Service Networks Key Laboratory of Computer Network and System Security of Shaanxi Province Xidian University 2 South Taibai Road Xi'an Shaanxi 710071 China Shandong Provincial Key Laboratory of Computer Network Jinan 250014 China Department of Computer Science Virginia Polytechnic Institute and State University 7054 Haycock Road Falls Church VA 22043 United States

Nowadays, with the rapid increase of WLAN-enabled mobile devices and the more widespread use of WLAN, it is increasingly important to have a more efficient initial link setup mechanism, and there is a demand for a faster access authentication method faster than the current IEEE 802.11i. In this paper, through experiments we observe that the authentication delay of 802.11i is intolerable under some scenarios, and we point that the main reason resulting in such inefficiency is due to its design from the framework perspective which introduces too many messages. To overcome this drawback, we propose an efficient initial access authentication protocol, FLAP, which realizes the authentications and key distribution through two roundtrip messages. We formally prove that our scheme is more secure than the four-way handshake protocol. Our practical measurement result indicates that FLAP can improve the efficiency of EAP-TLS by 94.7 percent. Extensive simulations are conducted in different scenarios, and the results demonstrate that when a WLAN gets crowded the advantage of FLAP becomes more salient. Furthermore, a simple and practical method is presented to make FLAP compatible with 802.11i. © 1990-2012 IEEE.

关键词： Authentication

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CPicker： Leveraging Performance-Equivalent Configurations to Improve Data Center Energy Efficiency

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Journal of computer Science & Technology 2018年第1期33卷 131-144页

作者： Fa-Qiang Sun Gui-Hai Yan Xin He Hua-Wei Li Yin-He Han State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China National Computer Network Emergency Response Technical Team of China Beijing 100029 China University of Chinese Academy of Sciences Beijing 100049 China

The poor energy proportionality of server is seen as the principal source for low energy efficiency of modern data centers. We find that different resource configurations of an application lead to similar performance, but have distinct energy consumption. We call this phenomenon as ＂performance-equivalent resource configurations （PERC）＂, and its performance range is called equivalent region （ER）. Based on PERC, one basic idea for improving energy efficiency is to select the most efficient configuration from PERC for each application. However, it cannot support every application to obtain optimal solution when thousands of applications are run simultaneously on resource-bounded servers. Here we propose a heuristic scheme, CPicker, based on genetic programming to improve energy efficiency of servers. To speed up convergence, CPicker initializes a high quality population by first choosing configurations from regions that have high energy variation. Experiments show that CPicker obtains above 17% energy efficiency improvement compared with the greedy approach, and less than 4% efficiency loss compared with the oracle case.

关键词： performance equivalence energy efficiency data center power management dynamic voltage and frequencyscaling （DVFS）

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A survey of routing algorithm for mesh Network-on-Chip

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Frontiers of computer Science 2016年第4期10卷 591-601页

作者： Yue WU Chao LU Yunji CHEN State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China School of Computer and Control Engineering University of Chinese Academy of Sciences Beijing 101408 China Loongson Technology Corporation Limited Beijing 100095 China

With the rapid development of semiconductor in- dustry, the number of cores integrated on chip increases quickly, which brings tough challenges such as bandwidth, scalability and power into on-chip interconnection. Under such background, Network-on-Chip （NoC） is proposed and gradually replacing the traditional on-chip interconnections such as sharing bus and crossbar. For the convenience of physical layout, mesh is the most used topology in NoC design. Routing algorithm, which decides the paths of pack- ets, has significant impact on the latency and throughput of network. Thus routing algorithm plays a vital role in a wellperformed network. This study mainly ：focuses on the routing algorithms of mesh NoC. By whether taking network information into consideration in routing decision, routing algorithms of NoC can be roughly classified into oblivious routing and adaptive routing. Oblivious routing costs less without adaptiveness while adaptive routing is on the contrary. To combine the advantages of oblivious and adaptive routing algorithm, half-adaptive algorithms were proposed. In this paper, the concepts, taxonomy and features of routing algorithms of NoC are introduced. Then the importance of routing algorithms in mesh NoC is highlighted, and representative routing algorithms with respective features are reviewed and summarized. Finally, we try to shed light upon the future work of NoC routing algorithms.

关键词： Network-on-Chip mesh topology routing algorithm adaptive routing oblivious routing

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A full-scale integrated-bioreactor with two zones treating odours from sludge thickening tank and dewatering house： performance and microbial characteristics

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Frontiers of Environmental Science & Engineering 2017年第4期11卷 171-178页

作者： Jianwei Liu Kaixiong Yang Lin Li Jingying Zhang Key Laboratory of Urban Stormwater System and Water Environment Beijing University of Civil Engineering and Architecture Ministry of Education Beijing 100044 China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences Beijing 100085 China University of Chinese Academy of Sciences Beijing 100049 China

A full-scale integrated-bioreactor consisting of a suspended zone and an immobilized zone was employed to treat the ordours emitted from a wastewater treatment plant. The inlet concentrations of H,S and NH3 were 1.6-38.6 mg.m-3 and 0.1 6.7 mg.m-3 respectively, while the steady-state outlet concentrations were reduced to 0-2.8mg.m - for H2S and 0-0.5mg.m for NH3. BothH2SandNH3 were eliminated effectively by the integrated-bioreactor. The removal efficiencies of H2S and NH3 differed between the two zones. Four species of microorganisms related to the degradation of H2S and NH3 were isolated. The characteristics and distributions of the microbes in the bioreactor depended on the inlet concentration of substrates and the micro-environmental conditions in the individual zones. Product analysis indicated that most of the H2S was oxidized into sulfate in the immobilized zone but was dissolved into the liquid phase in the suspended zone. A large amount of NH3 was converted into nitrate and nitrite by nitration in the suspended zone, whereas only a small amount of NH3 was transferred to the aqueous phase mainly by absorption or chemical neutralization in the immobilized zone. Different microbial populations dominated the individual zones, and the major biodegradation products varied accordingly.

关键词： Biological deodorization Microbial characteristics Ammonia Hydrogen sulfide Wastewater treatment plant

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Age-of-information-aware PI controller for load frequency control

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Protection and Control of Modern Power systems 2023年第3期8卷 32-46页

作者： Dan Jiao Changzheng Shao Bo Hu Kaigui Xie Chengrong Lin Zhuoxuan Ju State Key Laboratory of Power Transmission Equipment and System Security Chongqing UniversityChongqing 400044China Department of Electrical and Computer Engineering George Washington UniversityDC 20052 WashingtonUSA

Open communication system in modern power systems brings concern about information staleness which may cause power system frequency *** information staleness is often characterized by communication ***,communication delay is a packet-centered metric and cannot reflect the requirement of information freshness for load frequency control(LFC).This paper introduces the age of information(AoI),which is more compre-hensive and informative than the conventional communication delay modeling *** LFC controller and com-munication are integrated into the design for LFC performance *** AoI-aware LFC model is formulated first,and considering each allowable update period of the smart sensor,different AoI-aware PI controllers are then designed according to the exponential decay *** right AoI-aware controller and update period are selected according to the degree of frequency fluctuation of the power *** studies are carried out on one-area and two-area power *** results show the superior performance of the AoI-aware controllers in comparison to the delay-dependent controllers.

关键词： Power system Load frequency control(LFC) Age of information(AoI) PI controller

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