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基于硬件签名的循环式内存竞争记录算法

计算机研究与发展 2014年第5期51卷 1149-1157页

作者：朱素霞季振洲李东张浩哈尔滨理工大学计算机科学与技术学院哈尔滨150080 哈尔滨工业大学计算机科学与技术学院哈尔滨150001 中国科学院计算技术研究所北京100190

多核程序的执行存在不确定性,内存竞争记录是实现多核程序确定性重演的关键技术.针对现有内存竞争记录机制记录日志较大、重演速度受限等问题,提出了一种新型的循环式点到点内存竞争记录算法.该算法用当前发生序表示内存冲突,用硬件签... 详细信息

多核程序的执行存在不确定性,内存竞争记录是实现多核程序确定性重演的关键技术.针对现有内存竞争记录机制记录日志较大、重演速度受限等问题,提出了一种新型的循环式点到点内存竞争记录算法.该算法用当前发生序表示内存冲突,用硬件签名实现冲突检测,无需修改原有的cache结构;引入冲突方向检测机制,约减连续同向的当前发生序,记录循环发生序到内存竞争日志.该算法中,内存竞争日志中所记录的任意两线程间的内存竞争呈循环状,大大减少了冗余,并用增量计数器优化循环发生序,更大程度上减小了内存竞争日志.仿真结果表明该算法能够在引入较少硬件资源的前提下有效地减小内存竞争日志.同时,内存竞争日志也具有较好的可扩展性.

关键词：片上多核处理器多核程序确定性重演内存竞争记录冲突检测硬件签名

Surface-enhanced Raman spectroscopy chips based on two-dimensional materials beyond graphene

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Journal of Semiconductors 2021年第5期42卷 38-47页

作者： Enqing zhang Zhengkun Xing Dian Wan Haoran Gao Yingdong Han Yisheng Gao Haofeng Hu zhenzhou Cheng Tiegen Liu1 21School of Precision Instruments and Opto-electronics EngineeringTianjin UniversityTianjin 300072China Key Laboratory of Opto-electronics Information Technology Ministry of EducationTianjin 300072China Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Chemistry The University of TokyoTokyo 113-0033Japan

Surface-enhanced Raman spectroscopy(SERS) based on two-dimensional(2 D) materials has attracted great attention over the past decade. Compared with metallic materials, which enhance Raman signals via the surface plasmon effect, 2 D materials integrated on silicon substrates are ideal for use in the fabrication of plasmon-free SERS chips, with the advantages of outstanding fluorescence quenching capability, excellent biomolecular compatibility, tunable Fermi levels, and potentially lowcost material preparation. Moreover, recent studies have shown that the limits of detection of 2 D-material-based SERS may be comparable with those of metallic substrates, which has aroused significant research interest. In this review, we comprehensively summarize the advances in SERS chips based on 2 D materials. As several excellent reviews of graphene-enhanced Raman spectroscopy have been published in the past decade, here, we focus only on 2 D materials beyond graphene, i.e., transition metal dichalcogenides, black phosphorus, hexagonal boron nitride, 2 D titanium carbide or nitride, and their heterostructures. We hope that this paper can serve as a useful reference for researchers specializing in 2 D materials, spectroscopy, and diverse applications related to chemical and biological sensing.

关键词： Raman spectroscopy surface-enhanced Raman spectroscopy two-dimensional materials

Blazed subwavelength grating coupler

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Photonics Research 2023年第2期11卷 189-195页

作者： RONGXIANG GUO SHUJIAO zhang HAORAN GAO GANAPATHY SENTHIL MURUGAN TIEGEN LIU zhenzhou CHENG School of Precision Instruments and Optoelectronics Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Optoelectronics Information Technology Ministry of EducationTianjin 300072China Optoelectronics Research Centre University of SouthamptonSouthampton SO171BJUK Georgia Tech-Shenzhen Institute Tianjin UniversityShenzhen 518055China Department of Chemistry The University of TokyoTokyo 113-0033Japan

Short-wavelength mid-infrared(2–2.5 μm wave band) silicon photonics has been a growing area to boost the applications of integrated optoelectronics in free-space optical communications, laser ranging, and biochemical sensing. In this spectral region, multi-project wafer foundry services developed for the telecommunication band are easily adaptable with the low intrinsic optical absorption from silicon and silicon dioxide materials. However,light coupling techniques at 2–2.5 μm wavelengths, namely, grating couplers, still suffer from low efficiencies,mainly due to the moderated directionality and poor diffraction-field tailoring capability. Here, we demonstrate a foundry-processed blazed subwavelength coupler for high-efficiency, wide-bandwidth, and large-tolerance light coupling. We subtly design multi-step-etched hybrid subwavelength grating structures to significantly improve directionality, as well as an apodized structure to tailor the coupling strength for improving the optical mode overlap and backreflection. Experimental results show that the grating coupler has a recorded coupling efficiency of-4.53 dB at a wavelength of 2336 nm with a 3-dB bandwidth of ~107 nm. The study opens an avenue to developing state-of-the-art light coupling techniques for short-wavelength mid-infrared silicon photonics.

关键词： coupling directional grating

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真实感天空的实时渲染

高技术通讯 2012年第8期22卷 791-796页

作者：王纲季振洲张泽旭哈尔滨工业大学计算机科学与技术学院哈尔滨150001 哈尔滨工业大学深空探测基础研究中心哈尔滨150008

提出一种实现真实感天空实时渲染的高效方法。首先利用基于分析的天空模型实现天空的光照计算，该模型充分考虑了天空的昼夜变化，并对夜空中特有的各类光源如月球、星体、黄道光和气辉等进行分析；其次通过色调重现实现天空的真实感渲... 详细信息

提出一种实现真实感天空实时渲染的高效方法。首先利用基于分析的天空模型实现天空的光照计算，该模型充分考虑了天空的昼夜变化，并对夜空中特有的各类光源如月球、星体、黄道光和气辉等进行分析；其次通过色调重现实现天空的真实感渲染，通过对暗视效果的模拟进一步提高夜空渲染的真实感；最后给出基于观察窗口的天空几何模型和银河系、星体的渲染方法，并通过图形处理器（GPU）实现上述算法的实时渲染。该方法适用于室外场景的渲染，并已成功应用于某直升机飞行模拟器中。

关键词：天空模型色调重现几何模型实时渲染

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高压束阵式自动清洗系统

清洗世界 2010年第5期26卷 20-23页

作者：马洪发曾艳丽刘光恒孙震张振洲韩乃波杨松山唐贵富刘峰周勇彭继业董兆一沈阳仪表科学研究院辽宁沈阳110043 北京龙源冷却技术有限公司北京100176

介绍了火电厂直接空冷机组新清洗方式及其自动清洗系统。这种高压束阵式自动清洗系统比方阵扫描式提高清洗效率6～7倍。

关键词：电站直接空气冷却器高压水射流清洗清洗机

Suspended nanomembrane silicon photonic integrated circuits

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Chip 2024年第3期3卷 29-35页

作者： Rongxiang Guo Qiyue Lang Zunyue zhang Haofeng Hu Tiegen Liu Jiaqi Wang zhenzhou Cheng School of Precision Instrument and Opto-electronics Engineering Tianjin UniversityTianjin 300072China Key Laboratory of Opto-electronic Information Technology Ministry of EducationTianjin 300072China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Georgia Tech-Shenzhen Institute Tianjin UniversityShenzhen 518055China Department of Chemistry The University of TokyoTokyo 113-0033Japan School of Physics and Electronic Engineering Xinjiang Normal UniversityUrumqi 830054China

Leveraging the low linear and nonlinear absorption loss of silicon at mid-infrared(mid-IR)wavelengths,silicon photonic integrated circuits(PICs)have attracted significant attention for mid-IR applications including optical sensing,spectroscopy,and nonlinear ***,mid-IR silicon PICs typically show moderate performance compared to state-of-the-art silicon photonic devices operating in the telecommunication ***,we proposed and demonstrated suspended nanomembrane silicon(SNS)PICs with light-guiding within deep-subwavelength waveguide thickness for operation in the short-wavelength mid-IR *** demonstrated key building components,namely,grating couplers,waveguide arrays,micro-resonators,etc.,which exhibit excellent performances in bandwidths,back reflections,quality factors,and fabrication ***,the results show that the proposed SNS PICs have high compatibility with the multi-project wafer foundry *** study provides an unprecedented platform for mid-IR integrated photonics and applications.

关键词： Silicon photonics Suspended waveguide Mid-infrared Photonic integrated circuits Subwavelength grating

Research on influence factors of rock-soil thermal properties by laboratory test

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Global Geology 2014年第1期17卷 34-37页

作者： YIN Renchao zhang Yanjun WU Fan GAO Ping MEI zhenzhou College of Construction Engineering Jilin University

In order to discover the relation between rock-soil thermal properties and strata during the process of engineering investigation,the authors studied the measuring principle of Thermal Conductivity Scanner( TCS)and measured the thermal properties of 45 drilling samples from Qinghai with TCS in the laboratory. The results show that the specific heat capacity( SHC) decreases while the thermal conductivity( TC) increases with the increase of the depth. With the lithological change,the specific heat capacity and thermal conductivity have the opposite trend. The depth and lithology have a greater influence on the thermal conductivity than the specific heat capacity.

关键词： TCS rock-soil thermal properties thermal conductivity specific heat capacity

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涡轮盘疲劳寿命可靠性设计仿真及优化策略

国防科技大学学报 2023年第1期45卷 117-128页

作者：张文鑫吕震宙西北工业大学航空学院陕西西安710072

涡轮盘是航空发动机主要部件之一,一旦发生破坏性故障将导致严重的后果。在充分考虑影响涡轮盘高低周复合疲劳寿命因素不确定性基础上,以MATLAB为平台,设计了涡轮盘高低周复合疲劳寿命可靠性优化设计的联合仿真平台。利用寿命函数和寿... 详细信息

涡轮盘是航空发动机主要部件之一,一旦发生破坏性故障将导致严重的后果。在充分考虑影响涡轮盘高低周复合疲劳寿命因素不确定性基础上,以MATLAB为平台,设计了涡轮盘高低周复合疲劳寿命可靠性优化设计的联合仿真平台。利用寿命函数和寿命可靠性分析极限状态函数中的共性需求,提出了在优化迭代的过程中自适应构建寿命函数Kriging模型和寿命可靠性极限状态面Kriging模型时共用训练样本点的策略。同时,提出了一种构建寿命函数Kriging模型的学习函数。使用所搭建的疲劳寿命可靠性优化设计平台,完成了某型涡轮盘盘心、榫槽以及涡轮盘系统高低周复合疲劳寿命的可靠性优化设计。结果表明,最优设计方案的局部最大应力显著降低,均值寿命大幅提高,并满足可靠性约束。

关键词：涡轮盘高低周复合疲劳寿命可靠性优化设计代理模型全局学习函数

MOOC construction of major core course and reform of Hybrid Teaching Mode Taking "principle of embedded system" as an example

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计算机教育 2020年第12期 169-175页

作者： Ce zhang Weigong Lv Sheng Sheng Jianiong LiDianhui Chu zhenzhou Ji Weihua Guo Academic Affairs Office of Harbin Institute of Technology(Weihai) School of computer science Harbin Institute of Technology(Weihai)

The development of MOOC directly promotes the reform of physical classroom teaching,and leads to the reform of teaching mode and teaching method in the direction of improving teachers’teaching quality and students’learning effect and innovation *** order to meet the needs of MOOC teaching reform,based on the MOOC built by ourselves and running on the MOOC platform,this paper puts forward the hybrid teaching mode reform of the core courses of an computer specialty,which combines online and offline in *** out the knowledge system of an embedded system,build MOOC and put it online on domestic well-known MOOC platform,compile supporting teaching materials,and form an organic combination of online and offline teaching resources;proposing a hybrid teaching mode of online and offline combination,which focuses on interactive classroom teaching *** the basis of organizing students to carry out online autonomous learning,online and offline entity classroom carries out interactive classroom teaching reform;Using intelligent teaching tools to promote students to use mobile phones to participate in classroom learning,improve the universality of interactive teaching,carry out flipped classroom teaching,and improve the depth of interactive *** on the independent construction of MOOC,the hybrid teaching is carried out,which improves the pertinence of online teaching *** information-based teaching and flipped classroom teaching in the physical classroom improve the students’ability to solve problems,and lay a solid foundation for the improvement of teaching quality and learning effect.

关键词： MOOC embedded system principle professional core course hybrid teaching mode flipped classroom