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Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA)

作者： Fu-Song Hsu Wei-Yang Lin Tzu-Wei Tsai Department of Computer Science and Information Engineering National Chung Cheng University Chiayi Taiwan R.O.C Department of Multimedia Design National Taichung University of Science and Technology Taichung Taiwan R.O.C

In the recent years, the video-based approach is a popular choice for modeling and classifying facial expressions. However, this kind of methods require to segment different facial expressions prior to recognition, which might be a challenging task given real world videos. Thus, in this paper, we propose a novel facial expression recognition method based on extracting discriminative features from a still image. Our method first combines holistic and local distance-based features so that facial expressions could be characterized in more detail. The combined distance-based features are subsequently quantized to form mid-level features using the bag of words approach. The synergistic effect of these steps leads to much improved class separability and thus we can use a typical method, e.g., Support Vector Machine (SVM), to perform classification. We have performed the experiment on the Extended Cohn-Kanade (CK+) dataset. The experiment results show that the proposed scheme is efficient and accurate in facial expression recognition.

关键词： Face recognition Feature extraction Image recognition Face Support vector machines Active appearance model Emotion recognition

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Performance of a multimode LTE/WiMAX transceiver including the Nonlinear Interference Suppressor

Performance of a multimode LTE/WiMAX transceiver including t...

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2013 IEEE Aerospace Conference, AERO 2013

作者： Suarez, Martha Habibi, Hooman Zlydareva, Olga Ling E, Pooh Department of Integrated Circuits and Systems Instytut Technologii Elektronowej Al. Lotnikow 32/42 02-668 Warsaw Poland Electrical Engineering Department Eindhoven University of Technology Den Dolec 2 5612 AZ Eindhoven Netherlands School of Computer Science and Informatics University College Dublin Belfield Dublin Ireland Catena Radio Design Bv Science Park Eindhoven Ekkersrijt 6040 5692 GA Son en Breugel Netherlands

ISBN: (纸本)9781467318112

This paper deals with the implementation of a Nonlinear Interference Suppressor (NIS) into a wireless LTE transceiver. This within the context of high energy efficient multi-standard transceivers controlled by a cognitive radio platform. In multimode transceivers, the transmitter for one communication standard may induce a large interferer in the receiver for another standard. To linearly suppress this interferer, which can be several orders of magnitude larger than the desired received signal, the receiver should have a very large linear dynamic range, resulting in excessive power consumption. For this reason, we consider the NIS, a closed-loop tuning method that exploits the locally available interference as side information. The wireless LTE transceiver model, includes all the baseband signal treatment blocks and the RF front-end of a low IF direct conversion receiver architecture. A mobile WiMAX signal is considered as the interference signal at the receiver. The obtained symbol error rate (SER) is observed for different system configurations. Matlab simulation results in this practical scenario show that the NIS can strongly suppress the interferer while a symbol error rate performance close to that of an exactly linear receiver is achieved. This results permit to identify perspective directions for the better multi-standard and high energy efficient transceivers implementation. © 2013 IEEE.

关键词： Cognitive radio

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Multivariate statistical analysis of factors related to mean annual indoor radon concentrations of Greek dwellings

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Physica Medica 2014年 30卷 e90-e91页

作者： Dimitrios Nikolopoulos Sofia Kottou Ermioni Petraki Efstratios Vogiannis Christos Michail Anna Louizi Yiannis Chaldeos Panayiotis H. Yannakopoulos TEI of Piraeus Department of Electronic Computer Systems Engineering Petrou Ralli & Thivon 250 12244 Aigaleo Greece University of Athens Medical School Department of Medical Physics Mikras Asias 75 11527 Athens Greece Brunel University Department of Engineering and Design Kingston Lane Uxbridge Middlesex UB8 3PH London UK Evangeliki Model School of Smyrna Lesvou 4 17123 Nea Smyrni Greece TEI of Athens Department of Biomedical Engineering A.Spyridonos 12210 Aigaleo Greece

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Conceptualizing enterprise dynamic systems control for run-time business transactions

Conceptualizing enterprise dynamic systems control for run-t...

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21st European Conference on Information Systems, ECIS 2013

作者： Sérgio, Guerreiro José, Tribolet Universidade Lusófona de Humanidades e Tecnologias Escola de Comunicação Artes Arquitetura e Tecnologias da Informação Campo Grande 376 1749-024 Lisbon Portugal CODE Center for Organizational Design and Engineering INOV Rua Alves Redol 9 Lisbon Portugal Department of Information Systems and Computer Science Instituto Superior Técnico Technical University of Lisbon Portugal

Business transaction models prescribe the design freedom restrictions of a process-based organization and are useful to share a common understanding between the stakeholders that have a diverse interpretation of it. However, business transaction models do not guarantee that the business actors perform them accordingly. Business actors, individually and/or collectively, operate the organization and also administrate and control (steer and transform) it, by means of observing the state of the world and then acting with purpose to change its state. Therefore, a business actor is simultaneous a controller agent and a controlled agent within an enterprise. Classical dynamic system control theories alone are not applicable in a straightforward way to an enterprise because of the prohibitive complexity needed for the comprehensive definition of the business transactions' dynamics. This paper conceptualizes the alignment of business transactions models with operations performed at run-time by the business actors, grounded on the emerging field of Enterprise engineering and well-known Dynamic Systems Control theory, to elicit purposeful design requirements for a full enterprise dynamic systems control solution. A preliminary Markov chain simulation aids in clarifying the design requirements intent for the observation concept. In this simulation, the business transactions are observed considering three distinct variables: state space, transition space and actor roles.

关键词： Markov processes

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Advanced computational technique for the optimization of spiral mandrel dies

Advanced computational technique for the optimization of spi...

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70th Annual Technical Conference of the Society of Plastics Engineers 2012, ANTEC 2012

作者： Saul, K. Wortberg, J. University of Duisburg-Essen Institute of Product Engineering Engineering Design and Plastics Machinery Germany University of Duisburg-Essen Institute of Product Engineering Computer Aided Engineering Germany

ISBN: (纸本)9781622760831

The extrusion-die is one of the main components in an extrusion line and influences the product quality as well as the whole process efficiency. The requirements on extrusion-dies are versatile and the design of extrusion-dies is a very complex process with the necessity for huge know-how. Therefore the whole design process of a spiral-mandrel-die (SMD) based on a parametric 3D-CAD-mastermodel has been coupled with a 3D-CFD-simulation and implemented into a fully automized process. The flexibility of the extrusion dies to reach a high product quality for different materials is one of six criteria for the automatic interpretation of the extrusion die quality.

关键词： Dies

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Subspace-based SNR estimator for OFDM system under different channel conditions

Subspace-based SNR estimator for OFDM system under different...

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IEEE International Symposium on Broadband Multimedia Systems and Broadcasting (BMSB)

作者： Wei Li Yue Zhang Yuan Zhang Li-ke Huang John Cosmas Carsten Maple Institute for Research in Applicable Computing University of Bedfordshire Luton UK Department of Computer Science and Technology Univeristy of Bedfordshrie UK Aeroflex UK School of Engineering Design Brunel University London UK University Bedfordshire Luton UK

Signal-to-noise ratio (SNR) estimation plays an important role to adaptive modulation in Evolved Multimedia Broadcast Multicast Services (eMBMS). Based on the knowledge that the received signal space consists of signal subspace and noise subspace, we propose a subspace-based SNR estimation solution to cope with the time-varying channel with frequency selective effect and different OFDM pilot structure situations in eMBMS. The simulation is carried out on both PC and Aeroflex PXI platform. Simulation results show this proposed method gives good performance with different eMBMS pilot length and time-varying channels.

关键词： Signal to noise ratio Estimation Channel estimation OFDM Eigenvalues and eigenfunctions Vectors

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Temporally variable multi-aspect N-way morphing based on interference-free speech representations

Temporally variable multi-aspect N-way morphing based on int...

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Asia-Pacific Signal and Information Processing Association Annual Summit and Conference (APSIPA)

作者： Hideki Kawahara Masanori Morise Hideki Banno Verena G. Skuk Department of Design Information Sciences Wakayama University Wakayama Japan Faculty of Engineering Computer Science and Engineering University of Yamanashi Kofu Japan Graduate School of Science and Technology Meijo University Nagoya Japan Institute of Psychology Friedrich Schiller University of Jena Jena Germany

Voice morphing is a powerful tool for exploratory research and various applications. A temporally variable multi-aspect morphing is extended to enable morphing of arbitrarily many voices in a single step procedure. The proposed method is implemented based on interference-free representations of periodic signals and found to yield highly-naturally sounding manipulated voices which are useful for investigating human perception of voice. The formulation of the proposed method is general enough to be applicable to other representations and easily modified depending on application needs.

关键词： Abstracts Time-frequency analysis Educational institutions Mathematical model Equations Speech Vectors

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For what it is worth Anticipated eXperience Evaluation

For what it is worth Anticipated eXperience Evaluation

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8th International Conference on design and Emotion: Out of Control

作者： Gegner, Lutz Runonen, Mikael Department of Design School of Arts Design and Architecture Aalto University Finland Department of Computer Science and Engineering School of Science Aalto University Finland

ISBN: (纸本)9780957071926

Methods for evaluating concepts on an experiential level are either scarce or very limited in their focus. In this paper we present the Anticipated eXperience Evaluation (AXE) approach for evaluating early product concepts with users. The approach utilizes opposed images as interview stimuli to facilitate the metaphorical thinking and reflection of participants. AXE is a qualitative method that has been designed to provide development teams insights on how future users might experience and value a product or service concept. Furthermore AXE aims at eliciting suggestions from participants that can serve as inspiration for refining concepts. In this paper we provide a detailed description of the AXE approach and its development in three pilot studies.

关键词： Ergonomics

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Economic Analysis of 4G Network Upgrade

Economic Analysis of 4G Network Upgrade

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IEEE INFOCOM

作者： Lingjie Duan Jianwei Huang Jean Walrand Engineering Systems and Design Pillar Singapore University of Technology and Design Network Communications and Economics Lab Department of Information Engineering The Chinese University of Hong Kong Department of Electrical Engineering and Computer Sciences University of California at Berkeley California- 94720

ISBN: (纸本)9781467359443

As the successor to the 3G standard, 4G provides much higher data rates to address cellular users' ever-increasing demands for high-speed multimedia communications. This paper analyzes the cellular operators' timing of network upgrades and models that users can switch operators and services. Being the first to upgrade 3G to 4G service, an operator increases his market share but takes more risk or upgrade cost because 4G technology matures over time. This paper first studies a 4G monopoly market with one dominant operator and some small operators, where the monopolist decides his upgrade time by trading off increased market share and upgrade cost. The paper also considers a 4G competition market and develops a game theoretic model for studying operators' interactions. The analysis shows that operators select different upgrade times to avoid severe competition. One operator takes the lead to upgrade, using the benefit of a larger market share to compensate for the larger cost of an early upgrade. This result matches well with many industry observations of asymmetric 4G upgrades. The paper further shows that the availability of 4G upgrade may decrease both operators' profits due to increased competition. Perhaps surprisingly, the profits can increase with the upgrade cost.

关键词： 4G mobile communication economic analysis third generation Data transfer rates

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Secure authorization for controlling access via key management scheme

Secure authorization for controlling access via key manageme...

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IEEE Region 10 International Conference TENCON

作者： Tsung-Chih Hsiao Tzer-Long Chen Chih-Sheng Chen Fu-Sheng Xu Starlition Tsui Yu-Fang Chung Tzer-Shyong Chen College of Computer Science and Technology Huaqiao University Xiamen Fujian China Department of Technological Product Design Lingtung University Taichung Taiwan Department of Statistics Tunghai University Taichung Taiwan Department of Electrical Engineering Tunghai University Taichung Taiwan Department of Information Management Tunghai University Taichung Taiwan

With the rapid development of the Internet, many users start to take action putting personal or company information on it, and share with everyone. The Internet is public as it were, if we do not control its limit of authority to assure security, it's possible that those attackers do illegal access of important information and destroy them. Not only personal privacy is invaded, but the mass property damage. Therefore, effective access control system has been more and more emphasized these days. To fight against these network attacks, it is necessary to establish an effective and safe access control system; here we proposed a scheme, a key management which called Lagrange interpolation mainly takes access control model as framework, and use Elliptic Curve Cryptography system to enhance security. The fact we choose Lagrange interpolation is the key we use is randomized, no relationship between each key, so is relatively hard. As Elliptic Curve Cryptography system, we want attackers to encounter Elliptic Curve Discrete Logarithm Problem. Once the prime number is big enough, attackers will have trouble deciphering the key. Access control is so comprehensive, such as electronic documents, online television system sand wireless networks and so on, from previous literature; mobile agent technology applied in access control and key management would waste space and do exist some flaws in security, also we still have a lot of works to do on medical application. Hence, we propose these schemes in mobile agent in order to reach improvement, and then analyze of security and try to simulate what attackers will do. We conclude four common attacks: External Collective Attack, Internal Attack, Collusion Attacks and Equation Breaking Attack. As results, attackers are hard to decipher the key because of no relationship between each key and will face Elliptic Curve Discrete Logarithm Problem. We confirm that the proposed schemes can be more efficiently and safety to protect mobile agen

关键词： Access control Mobile agents Interpolation Polynomials Medical services Educational institutions

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