ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
24.81
Showing 51-71 articles out of 71 articles from the selected issue
  • Akihiko SUGIURA, Mitsunobu KAMATA
    Type: Article
    Session ID: BCS2000-171/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The present method extracts the subject from a picture by using partial autocorrelation to estimate blooming and removing portions of the picture that are far outside the focus.
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  • Mayuree Lertwatechakul, Ruttikorn Varakulsiripunth
    Type: Article
    Session ID: BCS2000-172/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposese a new concept of packet transmission method and scheduling scheme which is called "Window based TDM-like Scheduling"(W-TDM). The scheduling scheme is a frame-based with time-slot allocation strategy. The system services a packet only if the packet associates with one of the connections determined by a service-window at that time.(current window)The service-window concept is to introduce decreasing of the complexity of scheduler designing stage, which then increase the packet switching speed. The advantage of frame structure is delay-bound capability while time-slot allocation leads to no delay jitter, cell lost free and isolation property. In addition, the window concept is applied here to minimize the switch designing cost. The proposed system employs all the strategies mentioned above to enhance today broadband integrated services packet network technology.
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  • Awacharin Nachin, Somsak Mitatha
    Type: Article
    Session ID: BCS2000-173/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper presents about microcomputer, microcontroller and data transmission via computer network for application of housing estate security system. This system consists of three parts, the first part is a security system for each house using MCS-51 microcontroller as a central processing unit scanning 32 sensors and control 4 appliances and send alarm with siren and call house-owner or police station automatically, the second part is master/slave network that use microcomputer to display all alarms in graphic format and send control data of all system using serial communication RS-485 standard which can support up to 991 homes at transfer rate of 9600 bps. The third part of this project is Internet connection facility that enables users to examine status of sensors and turn Electrical Equipment ON/OFF via WEB browser.
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  • S. Kamolphiwong, T. Kamolphiwong
    Type: Article
    Session ID: BCS2000-174/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, we investigate the performance of ATM services to carry low bit rate voice traffic. We show some limitations of AAL-1(ATM Adaptation Layer 1)when it is used for carrying low bit rate voice, for example, low number of voice channels, under-utilise network resources. In contrast, when assessing the use of AAL-2 for carrying low bit rate voice, AAL2 offers a number of advantages when compared with AAL-1. However, the original AAL2 introduces a large overhead leading to low system throughput even a system is operated efficiently. We have proposed a new AAL2 scheme which has a lower overhead. We have shown that our proposed AAL-2 scheme can improve throughput performance of ATM networks when carry low bit rate voice traffic. Our proposed scheme offers a lower overhead as well as a higher number of voice channels.
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  • Adit Decharat, Khajitpan Makaratat, Narong Hemmakorn, Natth Junkrob
    Type: Article
    Session ID: BCS2000-175/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper studies on Ionospheric scintillation at 1.5GHz. The observed scintillation data received at Bangkok were taken during this solar maximum cycle and covered two ionospheric scintillation locations, POR and IOR. The study includes the cumulative distribution function of the signal and also signal statistics such as the decibel levels of maximum peak, 5% peak, maximum fade and 95% fade, in addition, compared with scintillation index S_4. This paper also presents empirical relation between fading level and S_4 and the power spectrum of scintillation event.
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  • Khajitpan Makaratat, Adit Decharat, Narong Hemmakorn, Kiyoshi Igarashi ...
    Type: Article
    Session ID: BCS2000-176/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Ionospheric scintillation on S-band satellite signal measurement carried out from February to September 2000 was analyzed statistically in this paper. Three minutes scintillation period and peak-to-peak fluctuation exceeding 0.5dB was considered to be one scintillation occurrence. The percentage occurrence in each month and scintillation events occurred on equinoctial dates were also described. Moreover, the comparison between 1, 3 and 5 minutes time interval of S_4 index was considered. In addition to the morphology, the statistics of scintillation intensity such as the distribution of amplitude deviation from their mean level, the cumulative amplitude distribution function and power spectrum analysis have been used to characterize the amplitude scintillation.
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  • O. sangaroon, J. Chamrasruangrong, C. Benjangkaprasert, K Janchitrapon ...
    Type: Article
    Session ID: BCS2000-177/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper presents the result of measurements studies the temporal spectrum of amplitude scintillation on high-elevation satellite path at Ku-band The shape of "short-term spectrum carried out during concurrent scintillation and rain attenuation are examined and found to be quite variable. The mean power spectrum can be displayed by two asymptotic with a value close to slope of Kolmogorov spectrum. The high frequency spectra roll off is shown display a corner frequency in the region around of 0.04Hz, and around of 0.003Hz in low frequency region. To distinguish between amplitude scintillation and rain attenuation from raw data, the effect on scintillation statistics of choice of f_c and the dependence of this choice on high elevation angle are discussed assess the frequency range of filtering.
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  • Yagasena, Syed Idris Syed Hassan, K. Igarashi, H. Minakoshi
    Type: Article
    Session ID: BCS2000-178/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper presents the results of one-year measurement of rain rate and attenuation at USM, Malaysia. The analysis shows that the attnuation follows a power and linear law for rain rates below and above 90mm/h respectively. A Two-Part model is proposed for use in the tropical region.
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  • Thikumporn Boonchuk, Prakit Tangtisanan, Narong Hemmakorn, Yoshiaki Mo ...
    Type: Article
    Session ID: BCS2000-179/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper discusses scintillation characteristics based on our observed data by THAICOM downlink signal using small-aperture antenna. There is a fairly evident diurnal variation between the occurrence number and time ; scintillation phenomena tend to arise more frequently in the daytime. Seasonal variation is not so clearly. The features of the characteristics of scintillation in Thailand are discussed.
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  • Kitti Paithonwattanakit, Yoothana Suansook
    Type: Article
    Session ID: BCS2000-180/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper we have study simulated annealing algorithm for n-queen problem, the classical puzzle in mathematics. This classical combinatorial search problem has been used as a popular benchmark to explore the new Artificial Intelligence search strategies and algorithms. The n-queens problem is to place n queens on an n×n chessboard so that no two queens attack each other. This problem has found many practicals in scientific and engineering applications including VLSI routing, maximum full range communication. In this paper, we present the solution from simulated annealing algorithm(SA)which is probabilistic method. Investigating an acceptance ratio and stochastic nature of solution from this problem is presented.
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  • Olarn Wongwirat, Chanboon Sathitviriyawong, Shigeyuki Ohara
    Type: Article
    Session ID: BCS2000-181/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper describes a synchronization mechanism for the applications of distributed simulation system in a shared virtual environment. Frequent sampling events and multiple-lock checking mechanism are used to exchange the updated states and control the concurrent events in the synchronization respectively for optimistic approach. By the proposed mechanism, a consistency-throughput tradeoff between dynamic and consistent shared states can be balanced in both optimistic and conservative synchronization algorithms. Serverless peer-to-peer architecture is used for distributed aspect of communications in the mechanism. Simulation results showing the operation concept of the optimistic synchronization mechanism using in the shared virtual environment application are included for discussion.
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  • Michihiro Shibamoto, Apinum Manyanon, Hiroshi Hoshino
    Type: Article
    Session ID: BCS2000-182/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, optimal control of distributed parameter system described in hyperbolic partial differential equation of Neumann boundary condition was discussed using functional analysis. Here, uniqueness and existence of the optimal control input were shown, and the control input was characterized.
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  • Hideki Tanaka, Apinum Manyanon, Hiroshi Hoshino
    Type: Article
    Session ID: BCS2000-183/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this paper, H_∞ control theory is applied to the design of the controller for the purpose of adjusting frequency variation and tidal current electric power deviation in 3-region interconnection LFC of electric power system.
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  • S. Fujimori, Y. yanagida, D. Kishimoto
    Type: Article
    Session ID: BCS2000-184/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    In this work, random walk parameters are applied to a time series of stock prices with rough set theory and its appropriateness of the possibility of application is discussed. As the result, it was obtained that theses methods were very applicable for such time series analysis.
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  • A. Yanagida, S. Fujimori, D. Kishimoto
    Type: Article
    Session ID: BCS2000-185/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    The methods of AI system are applied for the analysis and prediction of time series. And these methods can be combined with some of the methods for improvement in analysis and prediction accuracy. In this report, GA is combined with Rough Set theory for that purpose. The result is obtained that the combination system is suitable for increasing accuracy of analysis and prediction.
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  • Rini Pura KIRANA, Akihiko SUGIURA
    Type: Article
    Session ID: BCS2000-186/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    We try to detect mentally retarded children by analyzing their facial expressions after displaying certain face picture images at the early stage. So the correct treatment could be prescribed earlier and the possibility for the brain recovery is higher.
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  • Seri Pansang, Yingyos Sriboonrueng, Chom Kimpan
    Type: Article
    Session ID: BCS2000-187/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper presents the 3-D human face recognition using the technique of finding the range in 3-D from Stereo camera images while sweep the laser scans line across the face. We calculate the high accuracy distances from the camera to each point on the face's surface and we use these distances to reconstruct the surface of face in the 3-D coordinate system. Then we calculate the contour line, each contour line represent the depth of 0.5mm. After that we calculate the area inside each contour line. The characteristic of the changing size of the area of area each depth can be use as a feature of each face. The reference data of each face will be recorded to the database. In the recognition process, we find the relationship between the unknown's feature and every reference data in the database by using correlation coefficient. Then we can obtain the percentage of relationship of the unknown and each reference. With this presented method the recognition rate is up to 86.5%.
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  • Pisit Phokharatkul, Ukrit Marang, Chom Kimpan
    Type: Article
    Session ID: BCS2000-188/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    A recognition system for printed Thai character is proposed. We employ various methods i.e. Elliptic Fourier descriptors, Genetic Algorithms and Back-propagation Neural Networks to detecting boundary functions of characters, and attempt to normalize these functions by orientation and size variations of the symbols. Here, Genetic Algorithms and Neural Networks used to model the learning between the variables of boundary normalization of the characters. Finally, use of feed forward neural network to learn a boundary normalizes functions. A genetic algorithm is used to adjust the weights of the network interconnection. The experimental result shows the recognition rate are high though only a limited number of features have been involved. The result of this approach indicates that the systems can successfully recognized 3, 204 Thai characters with 94% accuracy.
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  • Watjanapong Kasemsiri, Chom Kimpan
    Type: Article
    Session ID: BCS2000-189/BFO2000-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    This paper proposes the method of using the Rough Sets as a classfier for the recognition of Thai Characters. In our work we divide the classification process into 2 levels, coarse and fine classification. There are 40 coarse groups, some of them not needing to pass through the second level of classification. The accuracy of this system rates as high as 99%
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  • Type: Appendix
    Pages App1-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (88K)
  • Type: Cover
    Pages Cover2-
    Published: December 22, 2000
    Released: June 23, 2017
    CONFERENCE PROCEEDINGS FREE ACCESS
    Download PDF (64K)
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