THz辐射的研究和应用新进展

THz频段是一个非常具有科学价值但尚未开发的电磁辐射区域,它的研究涉及物理学、光电子学及材料科学等,它在成像、医学诊断、环境科学、信息通信及基础物理研究领域有着广阔的应用前景和应用价值。当今,获得THz波的方法及THz波的探测研究是THz研究领域的前沿,更是重点。本文综述了THz波的特点、应用领域及发展状况,阐述了THz波的产生方法其探测方法。     

THz射线产生技术及应用最新进展

THz电磁脉冲是由超短激光脉冲选通半导体光导开关后产生的超宽频带电磁辐射,在很多基础研究领域、工业应用领域以及军事领域中有相当重要的应用。作者就THz电磁脉冲的产生技术、探测技术作了较全面的评述。对其若干重要应用研究成果包括THz时域光谱技术(TDS)、THz二维成像技术等也进行了分析。     

THz波微结构器件特性的研究

在电磁波谱中所处的特殊位置使得THz波在在物理、化学、生物医学、电子科学、材料科学、环境监测等领域有着广泛的应用前景。综述了THz波微结构器件特性方面的研究工作。亚波长金属周期微结构器件的THz波谱选择增强透射现象,亚波长环形槽金属线上的THz等效表面等离子体激元,以及THz光子晶体光纤。     

巡航段热层目标的天基THz探测技术研究

巡航段热层目标的探测是未来空间目标探测系统的重要目标。首先对巡航段热层目标自身的THz谱段辐射特性进行了理论分析,然后对可探测THz谱段的大气透过特性进行了仿真,通过理论计算排除了宇宙背景THz谱段辐射对天基探测的影响;最后结合目前THz探测器的发展水平,重点对天基THz技术探测巡航段热层目标的工程可行性进行了初步分析,并提出了可行的技术实现途径。     

THz时域频谱技术中若干效应的研究

在电磁波谱中所处的特殊位置使得THz波在物理、化学、生物医学、电子科学、材料科学、环境监测等领域有着广泛的应用前景。讨论了THz时域频谱技术的若干关键问题：THz发射晶体的双光子吸收、衍射效应和非线性效应（Kerr效应和类Kerr效应）等对THz产生效率的影响,THz辐射脉冲的载波包络相位差,THz小波变换频谱技术,以及利用光子晶体光纤飞秒激光作为激发源对THz时域频谱系统进行小型化和提高能量的方案。     

聚乙烯材料的THz吸收特性实验

THz辐射能够穿透很多对可见光不透明的非金属、非极性材料,而用x辐射对这些材料成像的对比度又相对低,因此,THz成像在军事和安全领域日益受到重视.对成像材料的THz特性的实际测量是THz成像技术的重要组成部分.文中利用CO2泵浦THz激光对聚乙烯材料的THz吸收特性进行了实验研究.根据实验数据拟合得出所用聚乙烯材料在70.51、96.5、118.83、122.4、158.51、184.31、214.58 μm波长的吸收系数.     

THz焦平面探测器及其成像技术发展综述

THz探测器作为THz成像系统的核心器件,一定程度上制约着THz成像技术的发展,鉴于单元/多元探测器的光机扫描成像模式存在的问题,THz焦平面探测器成像成为THz探测技术发展的方向。介绍了近年来国内外在THz焦平面探测器,特别是基于VOx的THz焦平面探测器及其成像技术的研究进展,分析了THz焦平面探测器及其成像模式的发展前景。本文对于研究THz成像技术及应用的发展具有重要的参考意义。     

THz辐射大气传输研究和展望

THz辐射在大气中的传输特性是THz波空间通信、大气科学及遥感检测等空间应用的基础,掌握不同温度、高度、湿度和压力等条件下THz频段大气透过率窗口的位置和宽度对于促进该频段的应用具有重要意义。本文分析了THz辐射大气传输的研究概况,包括大气传输的基本原理,辐射传输方程的推导以及对各类THz辐射大气传输模型的比较,并指出尚待解决的问题,最后对THz辐射大气传输研究给出若干建议和展望。     

氧化钒薄膜的制备及其在光激励下对太赫兹波的调制

采用磁控溅射法在蓝宝石基底上制备金属钒薄膜,然后在O2中快速热处理获得具有相变特性的VOx薄膜。实验对比了不同的热处理温度和热处理时间对薄膜性能的影响,薄膜的结晶状况用X射线衍射(XRD)进行分析;利用THz时域频谱系统,观测薄膜在不同激励光功率下的相变特性及其对THz波的调制作用。结果表明,在570℃条件下快速热处理60s所制得的VOx薄膜性能最佳,薄膜对THz波透过性最好,光激励后对THz波的调制作用最大,调制幅度达到83.9%,且引发相变的功率阈值低。     

THz技术及其在军事中的应用研究

为探索THz技术在军事中潜在的应用方向,本文研究了产生及检测THz辐射源的方法,针对THz波的特点,分析了THz技术在隐身飞机、探测弹道导弹及安全检测方面的应用。     

Alternative Schemes for Dynamic Secure VPN Deployment in UMTS

Three alternative schemes for secure Virtual Private Network (VPN) deployment over the Universal Mobile Telecommunication System (UMTS) are proposed and analyzed. The proposed schemes enable a mobile node to voluntarily establish an IPsec-based secure channel to a private network. The alternative schemes differ in the location where the IPsec functionality is placed within the UMTS network architecture (mobile node, access network, and UMTS network border), depending on the employed security model, and whether data in transit are ever in clear-text, or available to be tapped by outsiders. The provided levels of privacy in the deployed VPN schemes, as well as the employed authentication models are examined. An analysis in terms of cost, complexity, and performance overhead that each method imposes to the underlying network architecture, as well as to the mobile devices is presented. The level of system reliability and scalability in granting security services is presented. The VPN management, usability, and trusted relations, as well as their behavior when a mobile user moves are analyzed. The use of special applications that require access to encapsulated data traffic is explored. Finally, an overall comparison of the proposed schemes from the security and operation point of view summarizes their relative performance. Christos Xenakis received his B.Sc. degree in computer science in 1993 and his M.Sc. degree in telecommunication and computer networks in 1996, both from the Department of Informatics and Telecommunications, University of Athens, Greece. In 2004 he received his Ph.D. from the University of Athens (Department of Informatics and Telecommunications). From 1998–2000 was with the Greek telecoms system development firm Teletel S.A., where was involved in the design and development of advanced telecommunications subsystems for ISDN, ATM, GSM, and GPRS. Since 1996 he has been a member of the Communication Networks Laboratory of the University of Athens. He has participated in numerous projects realized in the context of EU Programs (ACTS, ESPRIT, IST). His research interests are in the field of mobile/wireless networks, security and distributed network management. He is the author of over 15 papers in the above areas. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of Electrical Engineering and Computer Science at the University of Connecticut, Storrs. From 1986 to 1994 he was on the faculty of the Electrical and Computer Engineering Department at Northeastern University, Boston, MA. During the period 1993–1994 he served as Director of the Communications and Digital Processing Research Center at Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. His research interests are in the design and performance analysis of broadband networks, and wireless/mobile communication systems and services. He has authored more than 150 papers in the above areas. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies & Services (ACTS) and Information Society Technologies (IST) programmes funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE). He is chairman of the board of the Greek Universities Network, the Greek Schools Network, and member of the board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

Metadata Design for Reconfigurable Protocol Stacks in Systems Beyond 3G

Global consensus on the next generation of wireless mobile communications, broadly termed “beyond 3G”, sketches a heterogeneous infrastructure comprising different wireless systems in a complementary manner and vested with reconfiguration capabilities, which support a flexible and dynamic adaptation of the wireless network and its spectrum resources to meet the ever-changing service requirements. For ubiquitous reconfiguration to become a practical capability of mobile communication systems, it is necessary to establish a global architecture for modeling, expressing, and circulating essential metadata related to reconfiguration, including reconfigurable device capabilities and semantic properties of protocol stacks. We outline the relevant standardization initiatives in the mobile domain, summarize existing work in reconfiguration-supporting architectures, and identify key shortcomings that may hinder the advent of ubiquitously reconfigurable systems. Further on, we point out some major limitations of current metadata standards in the mobile domain for the representation of capability information pertaining to reconfigurable protocol stacks. Next, we identify essential metadata classes in support of reconfigurable communication systems, introducing an associated object-oriented UML model. We elaborate on the design rationale of the UML model, presenting and discussing the alternative metadata representation standards and suitable encoding formats. Finally, we demonstrate the suitability of our UML model by applying our reconfiguration-supporting vocabulary in the cases of a standardized protocol stack of 3G mobile devices and stationary 3G cellular network elements. Vangelis Gazis received his B.Sc. and M.Sc. (Communication Networking) degrees from the Department of Informatics & Telecommunications of the University of Athens, Greece, in 1995, and 1998, respectively. He also received an M.B.A. degree from the Athens University of Economics and Business in 2001. Since 1996 until, he has been with the research staff of the Communication Networks Laboratory (CNL) of the University of Athens. He has participated in national and European research projects (MOBIVAS, ANWIRE) of the IST framework programme. He specializes in reconfigurable mobile systems and networks for beyond 3G, metadata and ontology languages, reflective and component middleware, adaptable services and open API frameworks for telecommunications. He is currently a Ph.D. candidate in the Department of Informatics & Telecommunications of the University of Athens. Nancy Alonistioti holds a B.Sc. degree and a Ph.D. degree in informatics and telecommunications from the University of Athens. Presently, she is a senior researcher in the Department of Informatics and Telecommunications of the University of Athens. In the past, she has held a research position with the Institute of Informatics and Telecommunications of NCSR “Demokritos” in the areas of protocol and service design and testing, mobile systems (UMTS), open architectures, and software defined radio systems and networks. Her current research interests are in reconfigurable mobile systems and networks beyond 3G, and adaptable services, pervasive computing and context awareness. She has participated in several national and European R&D projects, and has been the technical manager of the IST-MOBIVAS and IST-ANWIRE projects, which have had a focus on reconfigurable mobile systems, networks an respective service provision. She is currently a member of the management team and workpackage leader in the FP6 IST-E2R project on reconfigurability; she also serves as technical manager for the University of Athens in the FP6 IST-LIAISON project, which focuses on location based services in working environments. Dr Alonistioti is co-editor and co-author of the book entitled “Software defined radio, Architectures, Systems and Functions”, published by John Wiley in May 2003. She has authored over 55 publications in the area of mobile communications and reconfigurable systems and networks. Lazaros Merakos received the Diploma in electrical and mechanical engineering from the National Technical University of Athens, Athens, Greece, in 1978, and the M.S. and Ph.D. degrees in electrical engineering from the State University of New York, Buffalo, in 1981 and 1984, respectively. From 1983 to 1986, he was on the faculty of the Electrical Engineering and Computer Science Department, University of Connecticut, Storrs. From 1986 to 1994, he was on the faculty of the Electrical and Computer Engineering Department, Northeastern University, Boston, MA. During the period 1993D1994, he served as Director of the Communications and Digital Processing Research Center, Northeastern University. During the summers of 1990 and 1991, he was a Visiting Scientist at the IBM T. J. Watson Research Center, Yorktown Heights, NY. In 1994, he joined the faculty of the University of Athens, Athens, Greece, where he is presently a Professor in the Department of Informatics and Telecommunications, and Director of the Communication Networks Laboratory (UoA-CNL) and the Networks Operations and Management Center. Since 1995, he is leading the research activities of UoA-CNL in the area of mobile communications, in the framework of the Advanced Communication Technologies and Services (ACTS) and Information Society Technologies (IST) programs funded by the European Union (projects RAINBOW, Magic WAND, WINE, MOBIVAS, POLOS, ANWIRE, E2R, LIAISON). His research interests are in the design and performance analysis of communication networks, and wireless/mobile communication systems and services. He has authored more than 190 papers in the above areas. Dr. Merakos is Chairman of the Board of the Greek Universities Network, the Greek Schools Network, and Member of the Board of the Greek Research Network. In 1994, he received the Guanella Award for the Best Paper presented at the International Zurich Seminar on Mobile Communications.     

单目图像序列光流三维重建技术研究综述

由单目图像序列光流重建物体或场景的三维运动与结构是计算机视觉、图像处理与模式识别等领域的重要研究内容,在机器人视觉、无人机导航、车辆辅助驾驶以及医学影像分析等方面具有重要的应用。本文首先从精度与鲁棒性等方面对单目图像序列光流计算及三维重建技术近年来取得的进展进行综述与分析。然后采用Middlebury测试图像序列对HS、LDOF、CLG-TV、SOF、AOFSCNN 和 Classic ＋NL 等典型光流算法以及 Adiv、RMROF、Sekkati 和DMDPOF等基于光流的间接与直接重建方法进行实验对比分析,指出各对比方法的优点与不足,归纳各类方法的性能特点与适用范围。最后对利用分数阶微分模型、非局部约束、立体视觉以及深度线索解决亮度突变、非刚性运动、运动遮挡与模糊情况下光流计算及重建模型的局限性与鲁棒性问题进行总结与展望。     

高效双光子引发剂及水相中制备水凝胶微结构的研究进展

对双光子引发剂的设计合成和飞秒激光双光子聚合技术的基本原理进行了简单介绍。着重介绍了用于水凝胶双光子聚合的引发剂的研究进展,主要包括通过扩大共轭链长度、引入强供/吸电子基团、加入共引发体系等来增大双光子吸收截面,引入自由基淬灭基团以降低荧光量子产率,增加引发剂的水溶性来降低微结构细胞毒性等方面。这些研究为生物相容性三维水凝胶微纳结构的制备及应用提供了科学基础,是更好地模拟体内细胞生长微环境的必要条件。接着,介绍双光子聚合制备的水凝胶微纳结构及其在组织工程领域中的应用。最后,对生物相容性水凝胶微结构在应用中存在的问题与未来发展趋势进行总结和展望。     

Analysis and VLSI Realization of a Blind Beamforming Algorithm

We present the fixed-point analysis and VLSI realization of a maximum-power blind beamforming algorithm. This algorithm consists of the computation of a correlation matrix and its dominant eigenvector, and we propose that the latter be accomplished by the power method. After analyzing the numerical stability of the power method, we derive a division-free form of the algorithm. Based on a block-Toeplitz assumption, we design an FIR filter based system to realize both the correlation computation and the power method. Our ring processor, which is optimized to implement digital filters, is used as the core of the architecture. A special technique for dynamically switching filter inputs is shown to double the system throughput. VLSI design is discussed in detail and chip fabrication results are presented.Fan Xu received the B.S. and M.S. degrees in electronics engineering from Tsinghua University, Beijing, China, in 1993 and 1996, respectively, and the Ph.D. degree in electrical engineering from the University of California, Los Angeles, in 2001. His Ph.D. research focused on algorithm design and analysis for digital signal processors and eigenvector estimation architectures.In 1997, he held an internship at Bell Labs, Lucent Technologies, Holmdel, NJ, where he worked on equalization algorithms for cellular systems. He joined Broadcom Co., Irvine, CA, in 2001. His research interests include VLSI signal processing, customized digital signal processor, efficient hardware architectures for adaptive signal processing and high-performance VLSI design.Guichang Zhong received the B.S. degree from Xi an Jiaotong University, China, in 1996 and the M.S. degree from the Institute of Microelectronics of Chinese Academy of Sciences, Beijing, China, in 2000, both in electrical engineering. He is currently working toward the Ph.D. degree in integrated circuits and systems at the University of California, Los Angeles.His present research interests are in high-performance VLSI digital signal processors design, with an emphasis on reconfigurable and energy-efficient architecture.Alan N. Willson, Jr. received the B.E.E. degree from the Georgia Institute of Technology, Atlanta, in 1961, and the M.S. and Ph.D. degrees from Syracuse University, Syracuse, NY, in 1965 and 1967 respectively.From 1961 to 1964 he was with IBM, Poughkeepsie, NY. He was an Instructor in electrical engineering at Syracuse University from 1965 to 1967. From 1967 to 1973 he was a Member of the Technical Staff at Bell Laboratories, Murray Hill, NJ. Since 1973, he has been on the faculty of the University of California, Los Angeles (UCLA), where he is Professor of Engineering and Applied Science in the Electrical Engineering Department. In addition, he served the UCLA School of Engineering and Applied Science as Assistant Dean for Graduate Studies from 1977 through 1981 and as Associate Dean of Engineering from 1987 through 2001. He has been engaged in research concerning computer-aided circuit analysis and design, the stability of distributed circuits, properties of nonlinear networks, theory of active circuits, digital signal processing, analog circuit fault diagnosis, and integrated circuits for signal processing. He is editor of Nonlinear Networks: Theory and Analysis (New York: IEEE Press, 1974). In 1991 he founded Pentomics, Inc.Dr. Willson is a member of Eta Kappa Nu, Sigma Xi, Tau Beta Pi, the Society for Industrial and Applied Mathematics, and the American Society for Engineering Education. From 1977 to 1979, he served as Editor of the IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS. In 1980, he was General Chairman of the 14th Asilomar Conference on Circuits, Systems, and Computers. During 1984, he served as President of the IEEE Circuits and Systems Society. He was the recipient of the 1978 and 1994 Guillemin-Cauer Awards of the IEEE Circuits and Systems Society, the 1982 GeorgeWestinghouse Award of the American Society for Engineering Education, the 1982 Distinguished Faculty Award of the UCLA Engineering Alumni Association, the 1984 Myril B. Reed Best Paper Award of the Midwest Symposium on Circuits and Systems, the 1985 and 1994 W.R.G. Baker Awards of the IEEE, the 2000 Technical Achievement Award and the 2003 Mac Van Valkenburg Award of the IEEE Circuits and Systems Society.     

5G传输网络承载方案分析

5G时代3类典型场景的业务需求对承载网络在容量、时延和组网灵活性方面提出了更高的要求,同时针对无线网和核心网架构的变化提出了网络切片、增强路由转发功能等要求。首先分析5G的承载需求,重点考虑5G的3类典型业务场景、无线和核心网的架构变化;然后结合现网100GE PTN的实际应用情况,重点围绕容量、时延等维度完成需求与网络现状的对标;最后提出了网络回传、机房配套的演进方案。     

全球应急专网通信频谱研究概述

建设应急专网是为了满足重特大灾害事故救援、应急处突、重大活动保障等统一指挥调度通信的需要，是维护社会公共安全的重要通信手段。随着无线电技术的快速发展，传统的窄带应急通信技术体制难以满足新形势下多媒体数据通信、互联互通、安全抗干扰等需求，数字化、宽带化、泛在化成为应急专网发展的必然趋势。首先，概述了应急专网通信的技术体制及发展趋势，介绍了全球应急专网通信研究框架，重点分析了美国、欧洲、亚太等国家和地区应急专网频谱规划及使用现状，最后结合我国应急专网频谱规划情况，从技术趋势、产业发展、频段选择、建设模式等方面提出了我国应急专网建设的建议。     

基于结构照明的超分辨荧光显微成像重建算法

由于具有低光毒性、高速宽视场以及多通道三维超分辨成像能力,超分辨结构照明显微术(SR-SIM)特别适合用于活细胞中动态精细结构的实时检测研究。超分辨结构照明显微图像重建算法(SIM-RA)对SR-SIM的成像质量具有决定性影响。本文首先简要介绍了超分辨显微术的发展现状,阐述了研究SR-SIM图像重建算法的必要性;然后介绍了SR-SIM的成像原理,并重点介绍了SR-SIM图像重建算法,包括SR-SIM中频繁使用的去卷积重建算法、SR-SIM校准与重建过程中参数值获取的算法,以及目前发展的超分辨结构照明显微图像重建算法,并介绍了SR-SIM工具箱;最后总结了当前发展超分辨结构照明显微图像重建算法需解决的5个问题。     

卫星遥感温室气体的大气观测技术进展

全球、区域及城市的碳浓度、碳源汇信息是应对气候变化、达成双碳目标、完善国际谈判、支持治理政策制定与执行的重要依据。国际认可的“自上而下” 方法将卫星观测作为基础的通量计算技术, 是验证温室气体排放清单的重要手段。系统介绍了温室气体的卫星探测载荷原理、类别和发展, 以及反演、估算CO2、CH4 和N2O 的浓度和排放通量的方法, 还有探测缺失和误差存在的影响因素等; 分析了对卫星探测温室气体能力提高的迫切需求, 浓度反演和排放量估算精度不足, 以及N2O、氟化物等其他温室气体遥感研究缺乏、地基遥感验证能力薄弱等问题; 最后总结了我国温室气体卫星遥感技术的发展趋势, 主要是面向主被动高时空分辨率卫星的研制应用、高精度多尺度排放量估算(特别针对城市、小区域和点源尺度)、氟化物遥感评估等主题, 以加强对碳排放的量化观测, 并增强对碳循环的理解, 提高感知和应对气候变化的能力。     

A bang-bang PLL employing dynamic gain control for low jitter and fast lock times

Bang-bang phase detector based PLLs are simple to design, suffer no systematic phase error, and can run at the highest speed a process can make a working flip-flop. For these reasons designers are employing them in the design of very high speed Clock Data Recovery (CDR) architectures. The major drawback of this class of PLL is the inherent jitter due to quantized phase and frequency corrections. Reducing loop gain can proportionally improve jitter performance, but also reduces locking time and pull-in range. This paper presents a novel PLL design that dynamically scales its gain in order to achieve fast lock times while improving jitter performance in lock. Under certain circumstances the design also demonstrates improved capture range. This paper also analyses the behaviour of a bang-bang type PLL when far from lock, and demonstrates that the pull-in range is proportional to the square root of the PLL loop gain. Michael Chan received his bachelor degrees in Electrical Engineering and Computer Science from the University of Queensland in 2003. He is currently working towards his PhD at the same institution. His research interests include the design of high-speed clock and data recovery systems, and high speed phase locked loops. Adam Postula received the M.S. degree in electrical engineering from the Warsaw University of Technology, Poland, in 1974 and the Ph.D. degree in signal processing from the Poznan University of Technology, Poland, in 1981. He was an Electronic System Designer with ABB Sweden and a Researcher with the Royal Institute of Technology, Stockholm, Sweden, from 1983 to 1992. He led the development of high-level synthesis tools at the Swedish Institute of Microelectronics and was engaged in VHDL standardization in Europe. Since 1995, he has been a Senior Lecturer in the Department of Computer Science and Electrical Engineering, University of Queensland, Brisbane, Australia. His research interests include digital system design methodology, synthesis of digital systems, specialized processor architectures, and VLSI signal processing. Ding Yong received his PhD from University of London in electrical engineering in 1991. He was with National University of Singapore as a research scientist working in industrial research projects on data channel and servo-system for CD technology. In 1995, he joined VLSI design group of Western Digital as a principle engineer, where he was engaged in the IC design of Hard Disk Controller and CD-ROM Decoder and Controller. From 2000, he has been leading a mixed-signal design group as design manager and chief architect with Nano Silicon responsible for development of high-speed serial data transmission IPs. Lech Jóźwiak is an Associate Professor, Head of the Section of Digital Circuits and Formal Methods, at the Faculty of Electrical Engineering, Eindhoven University of Technology, The Netherlands. He received his M.Sc. and Ph.D. degrees in Electronics from the Warsaw University of Technology, Warsaw, Poland, in 1976 and 1982, respectively. From 1979 to 1986, he was a chief of two R&D teams in the Research Institute of Computers in Warsaw, and consultant to the United Nations Industrial Development Organization and industry. From 1986, he works mainly in the Netherlands, but also from time to time in USA, Canada, Australia, Belgium and Poland, combining advanced theoretical research with professional engineering practice and collaborating with industry, academia and governments. He is an author of a new information-driven approach to digital circuit synthesis, and new theories and methodologies of information relationships and measures, general decomposition and quality-driven design that have a considerable practical importance. He is also a creator of a number of practical products in the fields of application-specific (embedded) systems and EDA tools. His research interests include system, circuit, information and design theories and technologies, decision and optimization methodology, artificial intelligence, circuit and system design and EDA, re-configurable and massively parallel high-performance systems, embedded systems, and system dependability, analysis and validation. He is an author of more than 130 journal and conference papers and of some book chapters. He is a Director of EUROMICRO, co-founder and Steering Committee Chair of the EUROMICRO Symposium on Digital System Design, VIP in the IEEE International Symposium on Quality Electronic Design, program committee member of many other conferences, member of IEEE, EDAA, and of the Advisory Committee of the IEE Professional Network Embedded and Real-Time System Engineering. He is an advisor to the industry, Ministry of Economy and Commission of the European Communities in the fields of microelectronics, information technology, technology development and transfer, and SMEs.