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Advanced Structural Monitoring System Using Fiber Optic Sensors (광섬유 센서를 이용한 첨단 구조계측)

  • 김기수;김종우
    • Proceedings of the Korea Concrete Institute Conference
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    • 2002.10a
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    • pp.717-723
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    • 2002
  • Recently, the interest in safety assessment of civil infrastructures is increasing in Korea. Especially, as bridge structures become large-scale, it is necessary to monitor and maintain the safety state of bridges, which requires the monitoring system that can make a long-term measurement during the service time of bridge. In this paper, advanced fiber optic sensors for long-term measurement, setup techniques of bridge monitoring system and the assessment of measured data are introduced. Attached or embedded optical fiber sensors to structural members of small and big structures including Sung San Bridge are surveyed. For the Sung San Bridge, the responses of the fiber optic sensors by 30 ton weigh truck loads with various speeds ate measured. Monitoring system is also applied to the mock-up of bridges. The monitoring capability of the advanced fiber optic sensor system was confirmed.

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A Study on the Phonemic Analysis for Korean Speech Segmentation (한국어 음소분리에 관한 연구)

  • Lee, Sou-Kil;Song, Jeong-Young
    • The Journal of the Acoustical Society of Korea
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    • v.23 no.4E
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    • pp.134-139
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    • 2004
  • It is generally known that accurate segmentation is very necessary for both an individual word and continuous utterances in speech recognition. It is also commonly known that techniques are now being developed to classify the voiced and the unvoiced, also classifying the plosives and the fricatives. The method for accurate recognition of the phonemes isn't yet scientifically established. Therefore, in this study we analyze the Korean language, using the classification of 'Hunminjeongeum' and contemporary phonetics, with the frequency band, Mel band and Mel Cepstrum, we extract notable features of the phonemes from Korean speech and segment speech by the unit of the phonemes to normalize them. Finally, through the analysis and verification, we intend to set up Phonemic Segmentation System that will make us able to adapt it to both an individual word and continuous utterances.

A Study on the Stability of Explicit FE Analysis in the Sheet Metal Forming Analysis (박판 성형에서의 외연적 유한요소법의 안정성과 내연적 해석법과의 비교)

  • 심현보;전성문;손기찬
    • Transactions of Materials Processing
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    • v.9 no.3
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    • pp.293-303
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    • 2000
  • Recent developments of Fe technology make it possible to apply CAD/CAE/CAM techniques successfully to the stamping die design among the automotive parts industries. Those successful applications are greatly attributable to the development of commercial S/W. Up to now most commercial S/W for the analysis of sheet metal forming is based on the dynamic explicit algorithm. The main characteristics of dynamic explicit algorithm is that there is no convergence problem if the time increment is taken less than the stability limit. The stability of the analysis is guaranteed in the commercial code, since the adequate time increment is computed from the so called "Courant Condition". However excess computing time is often pointed out in the dynamic explicit analysis according to the characteristics of process parameters taken. In the study, various parameters that may affect the stability and the method how to improve computational efficiency of analysis have been investigated.estigated.

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Production of Contents Embodiment for Cyber Underwater Using Environment Fish Schooling Behavior Simulator

  • Kim, Jong-Chan;Cho, Seung-Il;Kim, Chee-Yong;Kim, Eung-Kon
    • Journal of Korea Multimedia Society
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    • v.10 no.6
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    • pp.770-778
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    • 2007
  • Fish schooling or group moving in cyber underwater is a part of beautiful and familiar ecosystem. It is not so easy to present the behavior of fish crowd naturally as a computer animation. Thanks to development of computer graphics in entertainment industry, the numbers of digital films and animations is increased and the scenes of numerous crowd are shown to us. Though there are many studies on the techniques to process the behavior of crowd effectively and the developments of crowd behavioral systems, there is not enough study on the development for an efficient crowd behavioral simulator. In this' paper, we smartly present the types offish behavior in cyber underwater and make up for the weak points of time and cost. We develop the fish schooling behavior simulator for the contents of cyber underwater, automating fish behavioral types realistically and efficiently.

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Design and investigation of a shape memory alloy actuated gripper

  • Krishna Chaitanya, S.;Dhanalakshmi, K.
    • Smart Structures and Systems
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    • v.14 no.4
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    • pp.541-558
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    • 2014
  • This paper proposes a new design of shape memory alloy (SMA) wire actuated gripper for open mode operation. SMA can generate smooth muscle movements during actuation which make them potentially good contenders in designing grippers. The principle of the shape memory alloy gripper is to convert the linear displacement of the SMA wire actuator into the angular displacement of the gripping jaw. Steady state analysis is performed to design the wire diameter of the bias spring for a known SMA wire. The gripper is designed to open about an angle of $22.5^{\circ}$ when actuated using pulsating electric current from a constant current source. The safe operating power range of the gripper is determined and verified theoretically. Experimental evaluation for the uncontrolled gripper showed a rotation of $19.97^{\circ}$. Forced cooling techniques were employed to speed up the cooling process. The gripper is simple and robust in design (single movable jaw), easy to fabricate, low cost, and exhibits wide handling capabilities like longer object handling time and handling wide sizes of objects with minimum utilization of power since power is required only to grasp and release operations.

ATM cell transmission performance evaluation for co-channel interference in the next generation satellite B-ISDN/ATM networks (차세대 위성 B-ISDN/ATM 망에서 공동채널간섭에 대한 ATM 셀 전송 성능평가)

  • 김병균;김신재;최형진
    • Journal of the Korean Institute of Telematics and Electronics S
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    • v.35S no.3
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    • pp.9-18
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    • 1998
  • For constructionof the next generation satellite B-ISDN/ATM networks considering integration with terrestrial information infrastructure networks, various high speed and wideband satellites with be launched and they will make used of frequency reue techniques for efficient management of limited frequency resource. Therefore, CCI(Co-Channel Interference) inherent in frequency reuse will be a dominant factor in performance degradation of satellite networks. This paper alanyzes the ATM cell transmission performance degradation caused by CCI. The satellite link, including up-link and down-link thermal noise, CCI, and nonlinear satellite transponder, is modeled and interleaving technique is used for compensating the ATM cell transmission performance degradation caused by burst error of satellite link. First, each satellite link subsystem is analyzed in detail and then end-to-end ATM cell transmission performance is evaluated with BER and CLR. Specifically, ATMcell transmission performance degradation caused by CCI is evaluated in detail.

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Computerized Golf Course Design Techniques Considering Environmental Impacts (환경영향을 고려한 골프코스 전산설계기법)

  • 주영규;전수복
    • Asian Journal of Turfgrass Science
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    • v.8 no.3
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    • pp.179-192
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    • 1994
  • Much attention has been paid recently to environmental destruction by golf course constructions in Koera. An efficiency and up-to-date technology on the planning and design practices has been requested to minimize the environmental impacts. Computerized systems for golf course design in the point of physical conservation of environment were discussed here. Geograpic Information System were applied on the process of geograpical data input and analysis through the final outputs, Simulation works by the total database management make enable to pre-investigate of the design in view of an assessment of environment impacts. It is also possible to evaluate plans easily and propose the alternatives properly. Precise quantity caculation of en-gineering works by computer system should be guarantee scientific, economic, and environme-ntally sound golf course design.

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Development of MMI Techniques of the Power Distribution Control Systems for Multimedia Environment (멀티미디어 배전감시 제어시스템의 MMI 기술개발)

  • Lee, Byung-Chul;Chung, Chin-Hyun
    • Proceedings of the KIEE Conference
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    • 1998.07c
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    • pp.1185-1187
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    • 1998
  • The object of this study shows a program for supervisory control of the electric power distribution, approach to the more easy manipulations and hangulization that could be easily familiar to the domestic operators whereas the program, up to now, displayed only in English. This program is consist of a skeleton-diagram designer and a state-displayer of the electric power distribution To make skeleton-diagram data available in state-displayer, the designer must be performed with the proposed format in the program manual. States display executes downloading S/Ws-state-data externally and display the S/W informations at that times, and also power distribution simulation of voluntary S/W manipulations performed by the internal operators is possible.

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Real-Time Precision Vehicle Localization Using Numerical Maps

  • Han, Seung-Jun;Choi, Jeongdan
    • ETRI Journal
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    • v.36 no.6
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    • pp.968-978
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    • 2014
  • Autonomous vehicle technology based on information technology and software will lead the automotive industry in the near future. Vehicle localization technology is a core expertise geared toward developing autonomous vehicles and will provide location information for control and decision. This paper proposes an effective vision-based localization technology to be applied to autonomous vehicles. In particular, the proposed technology makes use of numerical maps that are widely used in the field of geographic information systems and that have already been built in advance. Optimum vehicle ego-motion estimation and road marking feature extraction techniques are adopted and then combined by an extended Kalman filter and particle filter to make up the localization technology. The implementation results of this paper show remarkable results; namely, an 18 ms mean processing time and 10 cm location error. In addition, autonomous driving and parking are successfully completed with an unmanned vehicle within a $300m{\times}500m$ space.

The Morphology of Equatorial Plasma Bubbles - a review

  • Kil, Hyosub
    • Journal of Astronomy and Space Sciences
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    • v.32 no.1
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    • pp.13-19
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    • 2015
  • Plasma bubbles that occur in the equatorial F-region make up one of the most distinguishing phenomena in the ionosphere. Bubbles represent plasma depletions with respect to the background ionosphere, and are the major source of electron density irregularities in the equatorial F-region. Such bubbles are seen as plasma depletion holes (in situ satellite observations), vertical plumes (radar observations), and emission-depletion bands elongated in the north-south direction (optical observations). However, no technique can observe the whole three-dimensional structure of a bubble. Various aspects of bubbles identified using different techniques indicate that a bubble has a "shell" structure. This paper reviews the development of the concepts of "bubble" and "shell" in this context.