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On-chip silicon photonic signaling and processing: a review

Science Bulletin 2018年第19期63卷 1267-1310页

作者： Jian Wang yun Long Wuhan National Laboratory for Optoelectronics School of Optical and Electronic Information Huazhong University of Science and Technology

The arrival of the big data era has driven the rapid development of high-speed optical signaling and processing, ranging from long-haul optical communication links to short-reach data centers and highperformance computing, and even micro-/nano-scale inter-chip and intra-chip optical ***-chip photonic signaling is essential for optical data transmission, especially for chip-scale optical interconnects, while on-chip photonic processing is a critical technology for optical data manipulation or processing, especially at the network nodes to facilitate ultracompact data management with low power consumption. In this paper, we review recent research progress in on-chip photonic signaling and processing on silicon photonics platforms. Firstly, basic key devices (lasers, modulators, detectors)are introduced. Secondly, for on-chip photonic signaling, we present recent works on on-chip data transmission of advanced multi-level modulation signals using various silicon photonic integrated devices(microring, slot waveguide, hybrid plasmonic waveguide, subwavelength grating slot waveguide).Thirdly, for on-chip photonic processing, we summarize recent works on on-chip data processing of advanced multi-level modulation signals exploiting linear and nonlinear effects in different kinds of silicon photonic integrated devices (strip waveguide, directional coupler, 2D grating coupler, microring,silicon-organic hybrid slot waveguide). Various photonic processing functions are demonstrated, such as photonic switch, filtering, polarization/wavelength/mode (de)multiplexing, wavelength conversion,signal regeneration, optical logic and computing. Additionally, we also introduce extended silicon+photonics and show recent works on on-chip graphene-silicon photonic signal processing. The advances in on-chip silicon photonic signaling and processing with favorable performance pave the way to integrate complete optical communication systems on a monolithic chip and integrate silicon

关键词： Photonic integration Silicon photonics Photonic signaling Photonic processing Optical communications Optical interconnects

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Gravity-based heuristic for set covering problems and its application in fault diagnosis

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Journal of Systems Engineering and Electronics 2012年第3期23卷 391-398页

作者： yun Li Zhiming Cai Naval University of Engineering Wuhan 430033 E R. China Troops 54645 of the PLA Zhanjiang 524022 P. R. China

A novel algorithm named randomized binary gravita- tional search （RBGS） algorithm is proposed for the set covering problem （SCP）. It differs from previous SCP approaches because it does not work directly on the SCP matrix. In the proposed algo- rithm, the solution of SCP is viewed as multi-dimension position of objects in the binary search space. All objects in the space attract each other by the gravity force, and this force causes a global movement of all objects towards the objects with heavier masses which correspond to good solutions. Computation results show that the proposed algorithm is very competitive. In addition, the proposed aigodthm is extended for SCP to solve the fault diagno- sis problem in graph-based systems.

关键词： set covering problem (SCP) gravity force binary search space fault diagnosis.

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Perfect solar absorber based on nanocone structured surface for high-efficiency solar thermoelectric generators

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Science China(Technological Sciences) 2015年第1期58卷 19-28页

作者： DA yun XUAN YiMin School of Energy and Power Engineering Nanjing University of Science and Technology School of Energy and Power Engineering Nanjing University of Aeronautics and Astronautics

Nanostructured surface is a promising photon management strategy to tune spectrum in design of the selective solar *** this paper,we propose a nanocone structured surface as a perfect solar absorber in application of the solar thermoelectric generators(STEGs).The trade-off between the solar absorption and the mid-infrared emission is obtained to maximize the STEG *** effects of the geometric parameters,thermal concentration,incident angle and polarized state as well as the lattice arrangement are systematically *** results show that the STEGs equipped with our proposed selective solar absorber can achieve a peak efficiency of 6.53%under AM1.5G condition(no optical concentration).Furthermore,the selective solar absorber exhibits insensitive behavior to the incident angle and polarization angle as *** means that the proposed selective solar absorber can utilize solar energy as much as possible and be generally suitable in equipping the STEGs without optical concentration.

关键词： solar thermoelectric generators selective solar absorber photon management nanocone structured surface

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The Mexican hat effect on the delamination buckling of a compressed thin film

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Acta Mechanica Sinica 2014年第6期30卷 927-932页

作者： Yin Zhang yun Liu State Key Laboratory of Nonlinear Mechanics (LNM) Institute of Mechanics Chinese Academy of Sciences Faculty of Information and Automation Kunming University of Science and Technology

Because of the interaction between film and substrate,the film buckling stress can vary significantly,depending on the delamination geometry,the film and substrate mechanical *** Mexican hat effect indicates such *** analytical method is presented,and related dimensional analysis shows that a single dimensionless parameter can effectively evaluate the effect.

关键词： Buckling Delamination Elastic foundation Thin film Compliant substrate

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Stability Analysis of Systems With Time-varying Delay via a Novel Lyapunov Functional

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IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 1068-1073页

作者： yun Chen Gang Chen the School of Electrical and Information Engineering Hunan University of TechnologyZhuzhou 412007 the Key Laboratory for Electric Drive Control and Intelligent Equipment of Hunan Province Zhuzhou 412007China

This paper investigates the stability problem for time-varying delay *** obtain a larger delay bound,this paper uses the second-order canonical Bessel-Legendre(BL)***,using four couples of integral terms in the augmented Lyapunov-Krasovskii function(LKF)to enhance the relationship between integral functionals and other ***,unlike the construction of the traditional LKF,a novel augmented LKF is constructed with two new delayproduct-type terms,which adds more state information and leads to less conservative ***,two numerical examples are provided to demonstrate the effectiveness and the significant improvement of the proposed stability criteria.

关键词： Integral inequality Lyapunov theorem stability time-delay systems

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China's participation in and contribution to IPCC

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Science Bulletin 2019年第4期64卷 213-215页

作者： yun Gao Department of Science & Technology and Climate Change China Meteorological Administration

In 1988, the World Meteorological Organization (WMO) and the United Nations Environment Program (UNEP) jointly launched the In tergovern me ntal Panel on Climate Change (IPCC) to bring together scientists recommended by governments to assess the impacts of global climate change based on published literature. Five assessment reports have been released so far. In 2018, it marks the 30th anniversary of IPCC. Its previous reports, which are a collection of the up-to-date findings in climate change science at global level, have undergone rigorous expert and government reviews, hence recognized as an important source of scientific input to the international community in its understanding the climate change issue and devising a mechanism in response to it.

关键词： World WMO UNEP

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Practical Type Checking of Functions Defined on Context-Free Languages

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Journal of Computer Science & Technology 2004年第6期19卷 840-847页

作者： Hai-MingChen yun-MeiDong LaboratoryofComputerScience InstituteofSoftwareTheChineseAcademyofSciencesBeijing100080P.R.China

A type checking method for the functional language LFC is presented. A distinct feature of LFC is that it uses Context-Free (CF) languages as data types to represent compound data structures. This makes LFC a dynamically typed language. To improve efficiency, a practical type checking method is presented, which consists of both static and dynamic type checking. Although the inclusion relation of CF languages is not decidable, a special subset of the relation is decidable, i.e., the sentential form relation, which can be statically checked. Moreover, most of the expressions in actual LFC programs appear to satisfy this relation according to the statistic data of experiments. So, despite that the static type checking is not complete, it undertakes most of the type checking task. Consequently the run-time efficiency is effectively improved. Another feature of the type checking is that it converts the expressions with implicit structures to structured representation. Structure reconstruction technique is presented.

关键词： type checking context-free language algorithm

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Performance-Centric Optimization for Racetrack Memory Based Register File on GPUs

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Journal of Computer Science & Technology 2016年第1期31卷 36-49页

作者： yun Liang Shuo Wang Center for Energy-Efficient Computing and Applications ( CECA) School of Electrical Engineering and Computer Sciences Peking University Beijing 100871 China

The key to high performance for GPU architecture lies in its massive threading capability to drive a large number of cores and enable execution overlapping among threads. However, in reality, the number of threads that can simultaneously execute is often limited by the size of the register file on GPUs. The traditional SRAM-based register file takes up so large amount of chip area that it cannot scale to meet the increasing demand of GPU applications. Racetrack memory （RM） is a promising technology for designing large capacity register file on GPUs due to its high data storage density. However, without careful deployment of RM-based register file, the lengthy shift operations of RM may hurt the performance. In this paper, we explore RM for designing high-performance register file for GPU architecture. High storage density RM helps to improve the thread level parallelism （TLP）, but if the bits of the registers are not aligned to the ports, shift operations are required to move the bits to the access ports before they are accessed, and thus the read/write operations are delayed. We develop an optimization framework for RM-based register file on GPUs, which employs three different optimization techniques at the application, compilation, and architecture level, respectively. More clearly, we optimize the TLP at the application level, design a register mapping algorithm at the compilation level, and design a preshifting mechanism at the architecture level. Collectively, these optimizations help to determine the TLP without causing cache and register file resource contention and reduce the shift operation overhead. Experimental results using a variety of representative workloads demonstrate that our optimization framework achieves up to 29% （21% on average） performance improvement.

关键词： register file racetrack memory GPU

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Comparison of biochemical characteristics between PAO and DPAO sludges

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Journal of Environmental Sciences 2014年第6期26卷 1340-1347页

作者： Hansaem Lee Zuwhan yun Research Institute for Environmental Technology and Sustainable Development Korea University Department of Environmental Engineering Korea University

A successful enhanced biological phosphorus removal （EBPR） was observed in both anaerobic- aerobic sequencing batch reactor （An-Ox SBR） to induce growth of phosphorus accumulating organism （PAO） and anaerobic-anoxic （An-Ax） SBR to induce growth of denitrifying PAO （DPAO）. Although the EBPR performance of An-Ox SBR was higher by 11.3% than that of An-Ax SBR, specific phosphorus release rates in the An-Ax SBR （22.8 ± 3.5 mg P/（g ***）） and the An-Ox SBR （22.4 ± 4.8 mg P/（g ***）） were similar. Specific phosphorus uptake rates under anoxic and aerobic conditions were 26.3 ± 4.8 mg P/（g ***）（An-Ax SBR） and 25.6 ± 2.8 mg P/（g ***）（An-Ox SBR）, respectively, which were also similar. In addition, an analysis of relationship of poly-β-hydroxyalkanoates （PHA） synthesized under anaerobic conditions with phosphorous release （Preleased/PHAsynthesized） and of PHA utilized under anoxic and aerobic conditions with phosphorous uptake （Puptaked/PHAutilized） verified that biological activities of EBPR per unit biomass between DPAO and PAO were similar. An analysis of the specific denitrification rate of DPAO showed that NO3-N can be denitrified at a rate that does not substantially differ from that of an ordinary denitrifier without additional consumption of organic carbon when the PHA stored inside the cell under anaerobic conditions is sufficiently secured.

关键词： denitrifying EBPR poly-β-hydroxyalkanoates specific phosphorus release rate specific phosphorus uptake rate

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THE LOWER APPROXIMATION OF EIGENVALUE BY LUMPED MASS FINITE ELEMENT METHOD

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Journal of Computational Mathematics 2004年第4期22卷 545-556页

作者： JunHu yun-qingHuang HongmeiShen DepartmentofMathematics XiangtanUniversityXiangtanJ11105China

In the present paper, we investigate properties of lumped mass finite element method (LFEM hereinafter) eigenvalues of elliptic problems. We propose an equivalent formulation of LFEM and prove that LFEM eigenvalues are smaller than the standard finite element method (SFEM hereinafter) eigenvalues. It is shown, for model eigenvalue problems with uniform meshes, that LFEM eigenvalues are not greater than exact solutions and that they are increasing functions of the number of elements of the triangulation, and numerical examples show that this result equally holds for general problems.

关键词： Eigenvalue Finite element Lumped mass Min-max principle

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