• Proceedings of the Korea Information Processing Society Conference
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• 2003.11b
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• pp.1081-1084
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• 2003

국내외 라우터 시장은 급속한 성장추세에 있으며, 이와 같은 추세를 볼때 2004년 국내 라우터 시장은 2조원 정도의 규모가 될것으로 예상되어지고 있다. 하지만 라우터의 핵심 부품이라 칭할수 있는 라우팅 프로토콜은 현재 외국의 와인드리버사나 라우터웨어사에서 상용 라우팅 S/W를 수입하고 있는 실정이며, 고가의 라이센스 비용을 지불하고 있는 실정이다. 본 논문에서 다루고 있는 OSPF의 경우 AREA 간의 라우팅을 위하여 쓰이고 있으며 RFC 2328에 그 스펙이 정의되어져 있다. 여기서는 라우팅 프로토콜을 개발할 경우, 개발한 후에 기능 시험을 해야 하며 이들 기능 시험을 위한 시험 시나리오의 생성, 시험 환경의 구축. 적합성 시험 기술 등에 대한 연구 및 개발이 필요하다. 라우팅 프로토콜 시험 환경의 개발은 OSPF 프로토콜을 구현할 경우 프로토콜 기능을 시험할 수 있는 환경을 구축한다. 본 논문의 주요 내용은 라우팅 프로토콜인 OSPF 라우팅 프로토콜에 대한 시험 시나리오 생성 기술 연구, 시험 환경 구축, 시험 시나리오에 따른 프로토콜 적합성 시험, 망 적응 시험 수행이다. 이러한 기능들을 수행하기 위해 OSPF을 위한 시험 환경을 개발하고 단위 기능들에 대한 시험을 수행 한다.

• The Science & Technology
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• v.4 no.3 s.15
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• pp.35-39
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• 1971

1.서론 2.생체실험과 관여인자 3.종족차와 대사경로 4.약효평가 5.실험방법의 개발 6.결론

• Geotechnical Engineering
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• v.10 no.3
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• pp.41-54
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• 1994

This study aims at investigating the mechanism and operation of cubical triaxial test developed by Lade in order to obtain analysis on the clayey foundation deformation. A comparison on deviator stress, pore water pressure and stress path is made between test results of clay using the cubical consolidated undrained test as well as plane strain test.

• Journal of The Korean Society of Agricultural Engineers
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• v.54 no.3
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• pp.159-168
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• 2012

본 연구에서는 해성 점성토에 대하여 반복 삼축시험을 실시하고 응력-변형률 관계 및 유효응력경로 특성 분석을 통해 동적 변형 및 강도 특성을 조사하였다. 시험에 사용된 시료는 일본 도쿠시마현의 코마츠시마 항 인근에서 채취된 점성토이며, 반복 삼축시험으로 동적 비배수 삼축시험, 동적 비배수 삼축시험 후 동적 삼축변형시험, 다단계 동적 비배수 삼축시험, 동적 삼축 변형시험 등 4종류의 시험을 수행하고, 시험 주파수로서 0.1 및 0.01 Hz을 적용하였다. 본 연구 결과 0.01 Hz로 수행된 동적 삼축시험 결과는 0.1 Hz로 수행된 삼축시험 결과보다 평균유효응력의 감소량이 크며, 반복 하중은 해성 점성토의 구조적 약화를 초래하고 초기 거동시 발생하는 간극수압과 밀접하게 관련이 있는 것으로 나타났다. 또한 미소변형률 영역에서 등가 탄성계수는 시험 횟수가 증가함에 따라 점차 감소하며, 감쇠비는 점차 증가하는 것으로 보아 변형계수는 반복 하중으로 인한 전단변형률의 축척에 따른 변형률 의존 거동에 관련하는 것으로 판단된다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.5
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• pp.179-187
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• 2014

As an Accident data recorder (ADR) is a system to record a vehicle's status and dynamics information on the before and after of accident, Traffic accident investigation agencies and parts developers have a lot of interest to analyze an accident objectively and develop automotive safety devices by using real accident data, This study is to analyze an accident objectively and scientifically on the basis of traffic accident reconstruction with the use of output data of an event data recorder. This study is conducted double lane change test six times and slalom test one time as a field driving test and simulation. Based on the vehicle speed, the longitudinal and transverse acceleration, steering angle, driving path, and other kinds of information obtained from the field driving test, this study performed a simulation with PC-Crash program of reenacting and analyzing a traffic accident. The simulation was performed twice in the acceleration-steering angle input method and in the acceleration-driving path input method. By comparing the result of the field driving test with the results of the two simulations, we drew an analysis method with the optimal path reconstruction.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.24 no.8A
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• pp.1245-1251
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• 1999

A 1.25Gb/s path control switch chip has been designed and implemented with COMPASS tool and 0.8${\mu}{\textrm}{m}$ CMOS gate-array of LG semiconductor. This device controls the path of digital singnals in SDH-based transmission system. The proposed switch chip is suitable for self-healing operations both in a linear network and an unidirectonal ring, The self-healing operation of the switch is effectively done by the configuration information stored in the resisters of the switch. The test device adapted to SDH-based transmission system, show immediate restoration and a 10-11~10-12 bit error raito. And 2.5Gb/s or more high throughput can be realized by combining rwo identical or more switches with the parallel architecture.

• Journal of KIISE:Software and Applications
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• v.31 no.10
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• pp.1304-1319
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• 2004

We can significantly reduce the cost o# program testing by automating the process of test data generation. Test data generation usually concerns identifying input values on which a selected path is executed. Although lots of research has been done so far, there still remains a lot of issues to be addressed. One of the issues is the shape problem. The shape problem refers to the problem of figuring out a shape of the input data structure required to cause the traversal of a given path. In this paper, we introduce a new method for the shape problem. The method converts the selected path into static single assignment (SSA) form without pointer dereferences. This allows us to consider each statement in the selected path as a constraint involving equality or inequality. We solve the constraints to get a solution which will be represented in terms of the points-to relations for each input variable. Simple, but illustrative examples are given to explain the proposed method.

• Journal of the Korean Wood Science and Technology
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• v.31 no.2
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• pp.31-37
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• 2003

Among the nondestructive evaluation (NDE) methods for wood defect detection, ultrasonic wave has been considered as competitive technique in terms of economics and workability. Until now, researches on application of NDE methods for wood have focused mainly on standing tree and logs. Recently, some attempts have been conducted with NDE technique, for evaluation of wooden structural members. However, wooden structural members are different from others (standing tree or log) in various aspects. Expecially when some parts or whole member are covered with other materials, they can't be evaluated appropriately on general NDE methods. For the purpose of development of proper NDE technique for the wooden structural members, the ultrasonic wave transmission process investigated on artificial defect in wood. First, various types of transmission process were assumed, and then the transmission times were predicted respectively. Predicted times were compared with the measured time of ultrasonic wave and then a suitable type of transmission process is determined. In case of the ultrasonic wave doesn't transmit directly due to defect, it is reflected once only at the opposite surface of member, and the path is accord with the line of shortest length.

• Geotechnical Engineering
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• v.13 no.4
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• pp.149-162
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• 1997

A series of torsion shear tests were performed to study the strength characteristics of sand under various stress paths during rotation of principal stress. These results can be classified into two groups of 25cm and 40cm according to the height of specimen, and toy que was applied only in the clockwise direction. In this study, strength characteristics of sand for the principal stress ratio in torsion sheartests were investigated and their results were compared with Lade's failure criterion. And the effect for specimen was considered. From the results of tests, friction angle of sand was affected by the deviatoric principal stress ratio $b:(\sigma_2 -\sigma_s)/(\sigma_2, -\sigma_3)$Failure strength of sand was determined not by the stress paths but by the current stress state. From comparison of specimens on 25cm and 40cm height, effect of end restraint could not be found. In the test where b is over 0.5 due to extension force, necking phenomenon by the strain localization was found.

• Broadcasting and Media Magazine
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• v.7 no.1
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• pp.94-106
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• 2002

미국 지상파방송방식 ATSC의 전송방식(8-VSB)과 유럽지상파방송방식 DVB-T의 전송방식(COFDM)에 대한 현장비교시험이 서울을 비롯한 수도권 일원에서 2001년 9월 18일부터 2001년 11월 28일까지 약 3개월에 걸쳐 실시되었다. 이 시험에서는 도심지, 방사선, 원거리, 계층변조, 실내수신, 이동수신 등 6가지 유형에 대해 측정이 수행되었다. 측정결과, 유럽식이 미국식에 비해 모든 측정유형에서 우수한 성능을 보였다. 산악이 많고 도시에 건물이 밀집되어 다중경로간섭의 영향이 큰 한국의 환경에서는 유럽식이 더 적합한 방식임이 이 시험을 통해 입증되었고, 특히 이동수신의 경우 미국식은 거의 수신이 불가능한데 비해 유럽식은 표준화질에서 95%이상, 상당히 높은 고화질에서 70%이상의 수신율을 보여 미래의 새로운 서비스에 대한 적응성에서도 유럽식이 우수한 것으로 평가되었다.