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4th Advanced International Conference on Telecommunications (AICT 2008)

作者： Kruawan Wongpanya Keattisak Sripimanwat Kanok Jenjerapongvej Department of Information Engineering Faculty of Engineering King Mongkut''s Institute of Technology Ladkrabang Thailand Optical and Quantum Communications Laboratory National Electronics and Computer Technology Center Thailand

This paper presents the simplified method of random test suite based on the frequency (block) test. The test is used to check the first property of random numbers which is to have the same probabilities of being "1" and "0". Random numbers are used for the secret key generation which is an essential part for cryptographic system. Before encryption, secret keys need to pass the random test in order to make it harder for outsiders to predict the pattern of the secret keys. Basically, the decision making of whether the secret keys are truly random, is based on the test statistics computation. Due to the motivation that the classical method based on the NIST Statistical Test Suite (NIST STS) is complex and redundant, the reduction of this random testing procedure is then proposed. The introduced technique does not need to compute the Incomplete Gamma Function (Igamc) nor the P-value for the decision making of test results unlike that of the classical method. Thus, it results to the reduction in the testing decision time. In this technique, the decision making and conclusion can be determined from the critical value of chi-square (x{sup}2) directly. Its results without having to compute Igamc is compared to that of the classical method. In the test, the significance level (α) is set to be 0.01 or 0.05 in order to obtain the critical values and the critical regions. Resulting to the confidence of 99% or 95% respectively. Next, overall performance is evaluated by computing the percentage difference in order to demonstrate that the proposed value gives the same result as that of the classical method. Therefore, this proposed technique can be applied as that of the conventional based on the frequency (block) test.

关键词： Frequency Random number generation Electronic equipment testing NIST Statistical analysis Cryptography Decision making Quantum computing Probability Laboratories

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Low-voltage, low-power fully differential folded cascode OTA utilized in sample and hold stage of pipelined ADC

Low-voltage, low-power fully differential folded cascode OTA...

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4th International Conference on Cybernetics and Information Technologies, systems and Applications/5th Int Conf on Computing, Communications and Control Technologies

作者： Jamuar, S. S. Meaamar, Ali Alihasan, Wael A. Y. Mahdi, Mohd. Adzir B. Department of Electrical and Electronic Engineering Faculty of Engineering University Putra Malaysia (UPM) Malaysia Department of Computer and Communication System Engineering Faculty of Engineering University Putra Malaysia (UPM) Malaysia

ISBN: (纸本)9781934272244

A fully differential, high gain opamp to be used in a low-voltage low-power high speed pipeline ADC in a 0.18 mu m CMOS process is designed. The opamp architecture is based on folded cascode and "double differential amplifier" technique. This design operates of a 1.8V power supply, achieving a differential output swing of +/-1.65V, a DC gain of > 95 dB with a unity gain at 312MHz and a phase margin of 56 degrees and 0.5mW power dissipation. The opamp can be used to design high-speed ADCs, for local wireless communications. The minimized power dissipation opamp could be used in high resolution, high speed pipelined analog to digital converters, which are needed in applications requiring both high data rate and high speed, such as wireless LANs.

关键词： analog-to-digital converter OTA folded cascode differential amplifier

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Assessment and training of hand dexterity in virtual environment

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Journal Europeen des systemes Automatises 2007年第2期41卷 219-238页

作者： Veber, Mitja Kurillo, Gregorij Bajd, Tadej Munih, Marko University of Ljubljana Faculty of Electrical Engineering Laboratory of Robotics and Biomedical Engineering Slovenia University of California Department of Electrical Engineering and Computer Science Berkeley CA United States

We designed two systems for assessment and training of force coordination and hand dexterity in virtual environment. In the first system subjects aligned a real object with the reference virtual object. Pose of hand segments and object was assessed with motion tracking system. The study revealed repeatability of trajectories of movements and a significant delay in the movements of joints when close to their mechanical constraints. The second device was designed to simultaneously assess isometric forces applied by the fingers. Mathematical model of grasping was applied to achieve multi-fingered interaction with virtual objects. Several tasks were developed with the aim to improve grip force coordination and increase muscle strength of patients after stroke through repetitive exercises. © 2007 Lavoisier.

关键词： Virtual reality

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Evolutionary algorithm for a genetic robot’s personality

Evolutionary algorithm for a genetic robot’s personality

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IEEE International Workshop on Robot and Human Communication (ROMAN)

作者： Kang-Hee Lee Hyun-Sik Shim Woo-Sup Han Kwang-Choon Kim Jong-Hwan Kim Fundamental Technology Team Mechatronics & Manufacturing Technology Center Corporate Technology Operations Samsung Electronics Company Limited South Korea Application Technology Laboratory Telecommunication Research and Development Center Telecommunication Network Business Samsung Electronics Company Limited South Korea Faculty of Department of Electrical Engineering and Computer Science Korea Advanced Institute of Science and Technology South Korea

This paper proposes a new concept of the genetic robot which has its own robot genome, in which each chromosome consists of many genes that contribute to defining the robotpsilas personality. The large number of genes also allows for a highly complex system, however it becomes increasingly difficult and time-consuming to ensure reliability, variability and consistency for the robotpsilas personality while manually initializing values for the individual genes. To overcome this difficulty, this paper proposes an evolutionary algorithm for a genetic robotpsilas personality (EAGRP). EAGRP evolves a gene pool that customizes the robotpsilas genome so that it closely matches a simplified set of features desired by the user. It does this using several new techniques. It acts on a 2 dimensional individual upon which a new masking method, the Eliza-Meme scheme, is used to derive a plausible individual given the restricted preference settings desired by the user. The proposed crossover method allows reproduction for the 2-dimensional genome. Finally, the evaluation procedure for individuals is carried out in a virtual environment using tailored perception scenarios.

关键词： Robots

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Genetic Algorithm Audio Watermarking using Multiple Image-based Watermarks

Genetic Algorithm Audio Watermarking using Multiple Image-ba...

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2007 International Symposium on Communications and Information Technologies (ISCIT 2007), vol.3

作者： Mahasak Ketcham Sartid Vongpraphip Digital System Engineering Laboratory Department of Computer Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand Digital System Engineering Laboratory Department of Computer Engineering Faculty Engineering Chulalongkom University Bangkok Thailand

This article presents the audio watermarking using multiple image-based watermarks based on genetic algorithms (GA) in the discrete wavelet transforms is proposed. Rather than using one watermark into a whole length of audio, we select appropriate watermarks in order to embed it into selected parts. It is robust against watermarking attacks, which are commonly employed in literature. In addition, the watermarked image quality is also considered. We employ GA for the optimal localization of watermark. The watermark detection process can be performed without using the original audio signal. The experimental results demonstrate that watermark is inaudible and robust to many digital signal processing, such as cropping, low pass filter, additive noise.

关键词： Watermarking Genetic algorithms Information technology Multimedia systems Internet Large-scale systems Copyright protection Cryptography Optimization methods Steganography

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Using a patient image archive to diagnose retinopathy

Using a patient image archive to diagnose retinopathy

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Kenneth W. Tobin Michael D. Abramoff Edward Chaum Luca Giancardo V. Priya Govindasamy Thomas P. Karnowski Matthew T.S. Tennant Stephen Swainson Image Science and Machine Vision Group Oak Ridge National Laboratory Oak Ridge TN USA Department of Electrical and Computer Engineering University of Iowa Iowa IA USA Department of Ophthalmology and Visual Sciences University of Iowa Hospitals and Clinics Iowa IA USA Tennessee Health Science Center Hamilton Eye Institute Memphis TN USA Oak Ridge National Laboratory Oak Ridge TN USA Department of Ophthalmology University of Alberta Edmonton Canada Faculty of Medicine University of Alberta AB Canada

Diabetes has become an epidemic that is expected to impact 365 Million people worldwide by 2025. Consequently, diabetic retinopathy is the leading cause of blindness in the industrialized world today. If detected early, treatments can preserve vision and significantly reduce debilitating blindness. Through this research we are developing and testing a method for automating the diagnosis of retinopathy in a screening environment using a patient archive and digital fundus imagery. We present an overview of our content-based image retrieval (CBIR) approach and provide performance results for a dataset of 98 images from a study in Canada when compared to an archive of 1,355 patients from a study in the Netherlands. An aggregate performance of 89% correct diagnosis is achieved, demonstrating the potential of automated, web-based diagnosis for a broad range of imagery collected under different conditions and with different cameras.

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Survival Architecture for Distributed Intrusion Detection system (dIDS) using Mobile Agent.

Survival Architecture for Distributed Intrusion Detection Sy...

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IEEE International Symposium on Network Computing and Applications

作者： Sartid Vongpradhip Wichet Plaimart Department of Computer Engineering Faculty of Engineering Chulalongkom University Thailand Digital System Engineering Laboratory DSEL Department of Computer Engineering Faculty of Engineering Chulalongkom University Thailand

The attacking of the infrastructure of the computer network is seems to be one of the major problems. The increasing number of the Internet user all over the world comes with the risk that occurs from many network threats. One of the major tools for protecting the network attacking is the intrusion detection system (IDS), which make the system being the first target that will be attacked by the intruder. As we cannot avoid them, the problem is when there is an attack, how does the intrusion detection system survived. In this research, we show the restriction of the present intrusion detection system architecture and propose the new architecture that can handle the attack via the network and survive from it, using the mobile agent technology with the network topology design that hides the main resource of the network behind the intrusion detection system which separates network resource into segments and installs the monitored host onto each of network segment for robustness from all pattern of the attacking. The design avoid the single point of failure, shadow agent, together with proxy agent, fast backup and recovery mechanism, multicast group and the encryption of the communication between all the IDS for the network security.

关键词： Intrusion detection Mobile agents computer architecture computer networks IP networks Protection Network topology Condition monitoring Robustness Cryptography

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Signal transition graph based logic synthesis for asynchronous control circuits using template based method

Signal transition graph based logic synthesis for asynchrono...

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IEEE Region 10 International Conference TENCON

作者： Sufian Sudeng Arthit Thongtak Digital System Engineering Laboratory (DSEL) Department of Computer Engineering Faculty of Engineering Chulalongkom University Bangkok Thailand

This paper proposes an approach for reducing additional signals in signal transition graph (STG) based logic synthesis for asynchronous control circuits. The proposed scheme introduces a template based method in state encoding process to insert additional signals to STG with a small number. According to our method, complete state coding (CSC) property can be satisfied without using state graph tracing which is used in classical state based method. Our method is useful for large scale asynchronous controllers, and also it can guarantee the other relevant properties, such as persistency and consistency. Our process begins with an encoding STG using Petri-net level in order to form a template STG. Then the projection to each non-input signals from an original STG is done. After that, we trace the projection to smaller state space. If the small state space shows conflicts, we have to insert balance signals from template STG. Unbalance signals are inserted after in case the space still shows conflicts. Finally, we can get the STG with appropriate insertion points which is used to be projected for CSC support on each non-input signals. Asynchronous DMA controller is an example of our proposed method. The final part of this paper is concluded with a complexity comparison between our template based method with state based method and structural encoding method. It shows that the number of iterative signal removal according to our method is less than others.

关键词： Logic circuits Circuit synthesis Signal synthesis Encoding Control system synthesis Large-scale systems State-space methods Hazards Signal generators digital systems

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Component-based development of radio systems and subsystems: Are we there yet?

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IEEE COMMUNICATIONS MAGAZINE 2007年第6期45卷 44-+页

作者： Pucker, Lee Computer Science Department Technical University of Cluj-Napoca Cluj-Napoca Romania Department of Electronic Engineering State Key Laboratory on Microwave and Digital Communications Tsinghua National Laboratory for Information Science and Technology Tsinghua University Beijing China

The June 2005 "Trends in DSP" column explored the concept of component-based development for radio systems and subsystems. In this model the intermediate frequency (IF) and baseband signal processing associated with each wireless air interface standard on a given radio product are created from encapsulated software, hardware, and firmware intellectual property (IP) that can be reused from product to product.

关键词： digital signal processing Hardware Quadrature phase shift keying Demodulation Field programmable gate arrays Protocols Standards organizations Standardization system-on-a-chip Machine vision

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Isometric finger device for assessment and training of force coordination using virtual reality

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Journal of Medical Devices, Transactions of the ASME 2007年第4期1卷 279-282页

作者： Kurillo, Gregorij Mihelj, Matjaž Munih, Marko Bajd, Tadej Laboratory of Robotics and Biomedical Engineering Faculty of Electrical Engineering University of Ljubljana Tržaška 25 1000 Ljubljana Slovenia Department of Electrical Engineering and Computer Science University of California Berkeley Hearst Memorial Mining Building 475 Berkeley CA 94720 United States

Grasping of stroke patients is often affected by improper coactivation of muscles controlling the fingers. The restoration of hand function therefore represents an important goal in rehabilitation. Quantitative data on coordination between fingers can be helpful for the assessment of therapy effectiveness. We have designed a novel isometric finger device to assess three-dimensional forces applied by the thumb, index, and middle finger. The device was used in connection with a simple virtual reality task where the patient had to open a safe by sequentially rotating a knob using the isometric finger input. The presented virtual reality application was evaluated in a group of healthy subjects and a chronic stroke patient to obtain preliminary performance results. We analyzed the coordination of fingertip forces between the thumb and opposing fingers. Pearson correlation coefficient was determined to assess the coordination of force in each direction. In healthy subjects, the analysis of the fingertip forces showed precise coordination of force between the fingers to control a virtual object. The performance of the stroke patient was considerably lower due to reduced muscle control and presence of strong spasticity. The results showed use of excessive force in both hands and lower coordination of force between the fingers as compared to the healthy subjects. The proposed virtual reality system is considered as a complementary method to the existing methods used in physical and occupational therapy. Specific virtual reality tasks could be designed to train coordination of force between the affected fingers. Copyright © 2007 by ASME.

关键词： Biomechanics

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