• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.432-437
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• 2002

DSPA311(Analog Subscriber Line Board Assembly) is offer the interface of between analog subscriber and TDX-100 exchange system. DSPA311 is belong ASI block, accommodate dial and MFC telephone subscriber of 32 channel, and voice signal designed for interface with TSW, and 2 and 4 wire loop impedance is 600 (ohm). DSPA311 is consist 4 channel daughter beard QSLM-10(Quad Subscriber Line Module-10) and perform BORSCHT and be possible A/U-law select and GAIN value control by data control of DSPA171(Device controller I). In this Paper, We described the function test program for the DSPA311 Board by using the HP3070CT combinational test system, and an unmanned automatic test system.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.880-882
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• 2002

최근 사용자 정보의 안전한 정보 전송 및 네트워크 시스템의 안전성을 보장하기 위한 방법으로 각종보안 인증 프로토콜에 대한 연구가 진행 중에 있다. 그 중에서 AAA 는 다중 네트워크와 플랫폼에서 인증(Authentication), 권한 부여(Authorization), 자원 체크(Accounting)의 기능들을 제공하는 모든 프로토콜을 말한다. 이 논문에서는 AAA 프로토콜의 대표적인 예인 RADIUS(Remote Authentication Dial-in User Service)를 보안 프로토콜 디자인 및 분석 도구인 SPEAR(Security Protocol Engineering & Analysis Resource)를 이용해 SSL 상에서 동작하는 RADIUS 보안 프로토콜의 문제점 및 성능을 디자인 단계에서부터 분석하여 보안 프로토콜의 안정성을 보다 향상시키고자 하였다

• Proceedings of the Korea Concrete Institute Conference
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• 2002.05a
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• pp.151-156
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• 2002

Drying shrinkage cracking which may be caused by the relatively large specific surface is a matter of grave concern for latex modified concrete(LMC) overlay and rapid-setting cement latex modified concrete(RSLMC) overlay. LMC and RSLMC were studied for field applications very actively in terms of strength and durability in Korea. However, there were no considerations in drying shrinkage. Therefore, the purpose of this study was to investigate the drying shrinkage properties of LMC and RSLMC with the main experimental variables such as cement types(ordinary portland cement, rapid setting cement), latex contents(0, 5, 10, 15, 20%), W-C ratios, and curing days at a controlled environment of 60% of relative humidity and 2$0^{\circ}C$ of temperature. The drying shrinkage for specimens was measured with a digital dial gauge of Demec. The test results showed that the drying shrinkage of LMC and RSLMC were considerably lower than that of OPC and RSC, respectively. This might be attributed to the interlocking of hydrated cement and aggregates by a film of latex particles, water retention due to hydrophobic, and colloidal properties of the latexes resulting in reduced water evaporation.

• 제어로봇시스템학회:학술대회논문집
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• 2005.06a
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• pp.773-777
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• 2005

This article is about using information technology to apply with water loss inspection system in District Metering Area (DMA). Inspector can check Flow rate and Minimum Night Flow; NMF via Smart Phone or PDA include sending SMS Alert in case the Pressure, Flow rate and NMF is over the range of controlling. This will be used as equipment to implement water loss in international proactive and can keep on water loss reduction more efficiency. The system consists of Data Logger which collects data of Flow rate from DMA Master Meter. PC is Wap Server which dial via modem in order to get data through FTP Protocal that will convert text file to Microsoft Access Database. Wappage will use xhtml language to show database on Wapbrowser and can show the result on Smart Phone or PDA by graph and table for system analysis.

• The Journal of the Acoustical Society of Korea
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• v.12 no.3
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• pp.13-25
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• 1993

본 논문은 음성 다이얼링 시스템을 구현하기 위한 연결어 인식에 관한 연구이다. 적용된 인식 알고리즘은 기준패턴을 생성할 때 DMS 모델을 이용한 One-stage DMS/DP 알고리즘이고, 인식 대상어는 광운대학교 부서명 150 단어이다. 연결어 인식을 실시간으로 처리하기 위한 방법으로써 본 논문에서는 음절과 단어 단위의 DMS 템플리트를 구성하여 실험하였고 이 실험결과로부터 실시간과 인식률을 고려한 최적의 인식은 단어단위 템플리트에서 20 구간의 DMS 템플리트를 구성하여 실험하였고 이 실험결과로부터 실시간과 인식률을 고려한 최적의 인식은 단어단위 템플리트에서 20구간의 DMS 모델을 적용하였을 때 수행되었고, 이때 다중화자종속과 화자독립의 인식률은 각각 97.2%, 86.8%이다. 실험된 결과를 이용하여 음성 다이얼링 모델 시스템을 DSP 전용칩인 TMS320C30 프로세서를 내장한 DSP 보오드, 486 PC와 DIAL 모뎀을 이용해서 구현하였고, 전체 다이얼링 시간은 약 7~14초가 소요되었다.

• Proceedings of the Korea Concrete Institute Conference
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• 2000.10a
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• pp.517-522
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• 2000

In the past few years, the nondestructive inspection technology has greatly developed due to the increased necessity to gain a complete understanding of the bridge behavior. Especially, the deformations of bridges contain a lot of informations about its health state. By measuring these deformations it is possible to analyze the loading and aging behavior of the structure. However, the current methods (such as LVDT, dial gage, optical displacement tranceducer, etc) are often of changeable application on site and have the limitations of installation. In this paper, the classical beam theory was reviewed and the deflections of structure are estimated using measured strain which is easy to acquire. The applicability of this algorithm is verified by a preliminary steel beam test and two types of concrete beam tests. Also fiber optic sensors as well as resistive strain gages were installed in the concrete beams to establish the applicability of fiber optic sensors in the field of civil engineering.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.37 no.11
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• pp.826-833
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• 1988

In this paper we studied the control of overload which could bring the degradation of performance and threaten the stability of the electronic switching system. In order to get the essential requirement for overload control algorithm, we tried to extract the characteristics of commonly used algorithms by means of simulating overload control alogrithms in numerical stored program control switching model. As the result, we could find that the overload control algorithm which monitored the CPU occupancy had the best call complete rate and good response characteristecs and the algorithm using the offered load as a system state variable had a good grade of service which was represented by a short dial tone delay and 3rd quartile of deal tone delay. however, these control algorithms have no generality and need to get the control parameters by the trial-and-error method. We suggested the guidelines on the design of the overload control algorithm.

• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.450-452
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• 2001

In this paper, we proposed the automatic postal drop-off system based on the microprocessor board or PC. The weight of the small postal package is transmitted from the electronic scale and user-entered addresses and delivery rate are processed by the controller to calculate the fee. For 24 hour out-door operation and maintenance, non-cash payment methods such as credit card payment is used. The post stamp and receipt are printed by the thermal printer. For the electronic processing of the parcel, serial code is also printed on the stamp and receipts in bar code format. The parcel information obtained by the automatic postal drop-off system is transferred to remote central system by dial-up modem shared by the on site office. The proposed system and its control software are built for prototype model operation and the result met the design requirements. For real time processing, data reception through three serial ports is handled by interrupt routine. The proposed system is expected to be applied for commercial logistics system and pc automation system.

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.190-192
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• 2002

The industrial power distribution system is a radial system and therefore usually protected with time delayed over current relays (OCR's). Proper time dial settings are provided at the OCR's. Meanwhile, the systems, where synchronous generator, or synchronous motors, or large induction motors are operating, can not be protected with only OCR's with time grading. This paper presents a technical limit and a suitable range of time delay in applying OCR's to clearing faults in the industrial power systems for maintaining stability. Dynamic simulations are made to show them employing a real power systems of a large petro-chemical complex.

• The Journal of the Korean dental association
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• v.11 no.11
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• pp.735-737
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• 1973

This study is to determine the exact position of tipping rotation center of root. The method of measurement is to record by means of dial gauge. The different shapes of root of lower second premolar are named as smooth type, tapered type, and curved type. The followings are the result ; 1. The tipping rotation center of the teeth varies with he shape of roots. 2. The rotation center of the root is placed apical one third portion upon roots in the smooth shape of roots, one half portion of roots in the taper shape of roots and below the apical one-third of root in curve shape.