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ACM SIGCSE-SIGCUE Technical Symposium on Computer Science and Education

作者： Sally Fincher Raymond Lister Arnold Pears Judy Sheard Josh Tenenberg Alison Young Computing Laboratory University of Kent United Kingdom Faculty of Information Technology University of Technology Sydney Australia Dept of Information Technology Uppsala University Sweden School of Computer Science and Software Engineering Monash University Australia Computing and Software Systems Institute of Technology University of Washington United States of America Computing and Information Technology Unitec Auckland New Zealand

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What types of events provide the strongest evidence that the stock market is affected by company specific news?

Conferences in Research and Practice in Information Technolo...

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Conferences in Research and Practice in information technology Series 2006年 61卷 145-153页

作者： Robertson, Calum Geva, Shlomo Wolff, Rodney School of Software Engineering and Data Communications Faculty of Information Technology Queensland University of Technology Level 7 S Block 2 George Street Brisbane QLD 4000 Australia School of Economics and Finance Faculty of Business Queensland University of Technology Brisbane QLD 4000 Australia

The efficient market hypothesis states that an efficient market immediately incorporates all available information into the price of the traded entity. It is well established that the stock market is not an efficient market as it consists of numerous traders with differing strategies and interpretations of information. However there is substantial evidence to suggest that the stock market does incorporate new information into prices. Unfortunately little research has focussed on the high frequency effect of real time news, across a broad base of assets. This paper investigates how the US, UK, and Australian markets incorporate all real time news, not just Press Announcements, Annual Reports, etc. We find that there is strong evidence to suggest that the markets do incorporate news quickly.

关键词： Financial markets

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Design and analysis of a self-tuning proportional and integral controller for active queue management routers to support TCP flows

Design and analysis of a self-tuning proportional and integr...

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INFOCOM 2006: 25th IEEE International Conference on Computer Communications

作者： Xiong, Naixue Défago, Xavier Jia, Xiaohua Yan, G. He, Yanxiang School of Information Science Japan Advanced Institute of Science and Technology State Key Lab. of Software Engineering Computer School Wuhan University School of Information Science Japan Advanced Institute of Science and Technology 1-1 Asahidai Nomi Ishikawa 923-1292 Japan Kowloon Hong Kong IEEE IEEE Communication Society Department of Computer Science Wuhan University City University of Hong Kong Kowloon Hong Kong School of Computer Science and Technology Wuhan University of Science and Technology China SMIEEE

ISBN: (纸本)1424402212

Active Queue Management (AQM) is an effective method used in Internet routers for congestion control, and to achieve a tradeoff between link utilization and delay. The de facto standard, the Random Early Detection (RED) AQM scheme, and most of its variants use average queue length as a congestion indicator to trigger packet dropping. This paper proposes a novel AQM algorithm, called Self-tuning Proportional and Integral RED (SPI-RED), as an extension of RED. SPI-RED is based on a Self-tuning Proportional and Integral controller, which not only considers the average queue length at the current time point, but also takes into consideration the past average queue lengths during a round-trip time. Furthermore, we give theoretical analysis of the system stability and give guidelines for the selection of feedback gains for the TCP/RED system to stabilize the average queue length at a desirable level. Extensive simulations have been conducted with ns2. The simulation results have demonstrated that the proposed SPI-RED algorithm outperforms the existing AQM schemes in terms of drop probability and stability.

关键词： Queueing networks

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Modeling Cognitive Structure of Emotion for Developing a Pedagogical Agent Based Interactive Game

Modeling Cognitive Structure of Emotion for Developing a Ped...

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IEEE International Conference on Systems, Man and Cybernetics

作者： P. Ravindra De Silva Chandrajith Ashuboda Marasinghe Ajith P. Madurapperuma Stephen G. Lambacher Minetada Osano Software Engineering Laboratory University of Aizu Aizu-Wakamatsu Japan Faculty of Information Technology University of Moratuwa Colombo Sri Lanka Center for Language Research Aizu-Wakamatsu Japan

The paradigm of animated pedagogical agent has been developed in recent years. These lifelike autonomous characters inhabit leaning environments and make rich, face-to-face learning interactions possible. Children seem to develop an immediate and deep affinity to such characters: the agents abilities open up new possibilities, e.g. agents can demonstrate complex tasks, employ locomotion and gestures, focus children's attention on the most important aspects of a task at hand, and convey emotional responses to the game. This create a comfortable environment with the ability to both engage and motivate children. The pedagogical agent uses emotion, intensity of emotion, and game states in order to create rules for adapting the system according to child behavior. Results showed that an affective gesture recognition model was able to recognize a child's emotion with a considerably high rate of over 82.5%, and the social agent (estimate intensity of emotion) had a strong relationship with observers' feedback, except in low intensity levels.

关键词： Humans Adaptation model Computer errors Animation Emotion recognition Feedback Electronic learning Context modeling Biosensors Cybernetics

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RPINA- Network Forensics Protocol Embedding Privacy Enhancing Technologies

RPINA- Network Forensics Protocol Embedding Privacy Enhancin...

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International Symposium on Communications and information Technologies (ISCIT)

作者： Giannakis Antoniou Stefanos Gritzalis Faculty of Information Technology Monash University VIC Australia Lnfo-Sec-Lab Laboratory of Information and Communication Systems Security Department of Information and Communication Systems Engineering University of Aegean Samos Greece

Although privacy is considered to be the ultimate right for every user to enjoy intercommunications with security and anonymity, the provision for such a service could easily be adapted as a hiding cover by malicious users. Privacy enhancing technologies (PETs) should not only hide the identity of legitimate users but also provide means by which evidence of malicious activity can be gathered and revealed when necessary. This paper proposes a network forensics protocol called RPINA (respect private information, not abuser) which may operate over PETs, without violating the privacy of innocent users, but only the privacy of abusers. This approach introduces a new dimension in the relation between these two opposite-goal technologies, which enhances their viability in the global network environment

关键词： Forensics Protocols Privacy Positron emission tomography Network servers Electronic mail Communication system security Protection information technology laboratories

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Towards DEVS-based simulations of geoagent-based models with decentralised dynamic properties

Towards DEVS-based simulations of geoagent-based models with...

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2nd DEVS Integrative M and S Symposium, DEVS 2006, Part of the 2006 Spring Simulation Multiconference, SpringSim 2006

作者： Gonçalves, António Correia, Luís Rodrigues, Armanda Santos, Maria Alzira Hydraulics and Environment Dept. National Lab. of Civil Engineering Information Technology Div. Av. do Brasil 101 1700-066 Lisboa Portugal Dep. Informatics Faculty of Science University of Lisbon Campo Grande 1749- 016 Lisboa Portugal Dep. Informatics Faculty of Science and Technology New University of Lisbon Quinta da Torre 2829-516 Caparica Portugal

This paper is based on work in progress for integrating simulations of agent-based models with geographic information systems using a DEVS-based approach. Work on multi-agent systems (agents-centric view) and geographic information systems (resource-centric view) reveals that actual platforms do not provide truly integrative modelling and simulation of both views. We argue that actual DEVS-based simulators facilitates that integration, providing a process of composing behaviours depending of time passage, however other mechanisms are needed to enable decentralised dynamic interactions of agents in spatio-temporal contexts.

关键词： Multi agent systems

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On the quality of service of failure detectors based on control theory

On the quality of service of failure detectors based on cont...

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International Conference on Advanced information Networking and Applications (AINA)

作者： N. Xiong Yan Yang Jianxun Chen Yanxiang He The State Key Lab of Software Engineering Computer School of Wuhan University China Japan Advanced Institute of Science and Technology School of Information Science Japan Computer Science and Technology School Wuhan University of Science and Technology China

The detection of failures is a fundamental issue for fault tolerance in distributed systems. Recently, many people have come to realize that failure detection ought to be provided as some form of generic service, similar to IP address lookup. However, this has not been successful so far; one of the reasons being the fact that classical failure detectors were not designed to satisfy several application requirements simultaneously. More specifically, traditional implementations of failure detectors are often tuned for running over local networks and fail to address some important problems found in wide-area distributed systems with a large number of monitored components. In this paper, we study the quality of service (QoS) of failure detectors. We first present a novel failure detector scheme combined with control theory that can help in solving or optimizing some problems. Furthermore, this paper discusses the design and analysis of implementing a scalable failure detection service for such large wide-area distributed systems considering dynamically adjusting the heartbeat streams, so that it satisfies the bottleneck router requirements. We further show how the online failure detector control algorithm can be used to design a controller, analyze the theoretical aspects of the proposed algorithm and verify its agreement. Simulation results show the efficiency of our scheme in terms of high utilization of the bottleneck link, fast response and good stability of the bottleneck router buffer occupancy as well as of the controlled sending rates. In conclusion, the new failure detector algorithm provides a better QoS.

关键词： Quality of service Detectors Control theory Failure analysis Algorithm design and analysis Fault detection Fault tolerant systems Condition monitoring Heart beat Stability

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Educational Virtual Instrumentation Application for System Identification

Educational Virtual Instrumentation Application for System I...

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IEEE Instrumentation and Measurement technology Conference

作者： Mircea Popa Raul Ionel Voicu Groza Marius Marcu Computer and Software Engineering Department Faculty of Automation and Computers University E2809CPolitehnicaE2809DTimisoara Romania Measurement and Optical Electronics Department Faculty of Electronics and Telecommunication Engineering UniversityE2809CPolitehnicaE2809DTimisoara Romania School of Information Technology and Engineering University of Ottawa Ottawa Canada

The PC based virtual instrumentation is a dynamic and attractive alternative to the classic instrumentation. Its main advantages are: flexibility and adaptability, low cost, wide development of extension PC boards with measurements features, attractive representation of measurement results, in different forms, on the PC's monitor. The paper presents a system identification application with PC based (virtual) instrumentation. The virtual system is made of an external board, connected to the PC via the USB interface and a software tool, Agilent VEE (Visual engineering Environment). The presented virtual system can work as a voltmeter, ammeter, signal generator, digital oscilloscope and power supply. The main contribution of the paper is the extension of the application domain of the virtual instrumentation system to system identification. The identification method consists of applying to the system input a binary pseudorandom signal (BPRS) and determining the impulse response of the system as being well approximated by the cross-correlation function between the input signal and the answer of the system. The application is intended for educational purposes but can be used in other areas too

关键词： Instruments System identification Application software Signal processing Costs Universal Serial Bus software tools Power engineering and energy Voltmeters Ammeters

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Access Control Model for P2P File-Sharing Systems Based on Trust and Recommendation

Access Control Model for P2P File-Sharing Systems Based on T...

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International Conference on Semantics, Knowledge and Grid (SKG)

作者： Guang-xue Yue Guang-xue Yue Fei Yu Fei Yu Yi-jun Chen Yi-jun Chen Rong-hui Wu Rong-hui Wu Ji-yao An Ji-yao An Ren-fa Li Ren-fa Li College of Information Engineering JiaXing University JiaXing China State Key Lab. for Novel Software Technology Nanjing University Nanjing China School of Computer & Communication Hunan University Changsha China

The decentralized and anonymous characteristics of P2P environments make the task of controlling access to sharing information more difficult, which cannot be done by traditional access control methods. In this paper, the access control requirements in such environments were identified, and an access control model for P2P file-sharing systems based on trust and recommendation was proposed. The model integrates aspects of trust and recommendation, fairness based participation schemes and access control schemes.

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Cross-Language Similarity between Perceptual and Semantic Structures of Color Tones

Cross-Language Similarity between Perceptual and Semantic St...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Charith N.W. Giragama Chandrajith A. Marasinghe Ajith P. Madurapperuma Dishna R. Wanasinghe Susantha Herath Osano Minetada Valista International Lanka (Private) Limited Sri Lanka Department of Software Engineering University of Aizu Japan Faculty of Information Technology University of Moratuwa Sri Lanka Saint Cloud State University Saint Cloud MN USA

The paper describes a study of how Japanese and Sinhala naive viewers use modifiers to describe differences in color tones. Three sequences of color tone stimuli were created for three hues, red, green and blue by varying just two parameters, saturation and value. Two methods were employed to study how naive viewers use modifiers to describe differences in their perceptions and modifiers of color tones. A preliminary elicitation employed the methods of selection description, in which Japanese and Sinhala modifiers meaning - pale, bright, vivid, strong, dull, dark - constituted a high proportion of responses. These modifiers were employed in a triadic comparison. Dissimilarities of all pair wise comparisons of stimuli were submitted to MDS analysis in order to derive a multidimensional perceptual structure for the stimuli. A semantic differential structure was derived applying PCA for modifier responses provided for the same set of stimuli. The results revealed that Japanese and Sinhala native speakers perceptually discriminate the six color tone stimulus into six categories. Furthermore, the semantic structures for each hue were different from one a another. And it was observed that the semantic structures related differently to the dimensions of the perceptual structures.

关键词： information retrieval Humans Multidimensional systems software engineering information analysis Computational modeling Cybernetics Principal component analysis Image color analysis Internet

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