• 한국통신학회논문지
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• 제17권8호
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• pp.796-804
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• 1992

본 논문은 레지스터 인서션 링 구조를 사용한 Backbone 네트워크의 디자인에 관하여 연구하였다. 고속의 레지스터 인서션 Backbone 링 네트워크는 적은 비용으로 간단한 모듈라 구조와 Concurrent Communication을 통하여 네트워크간의 빠른 속도의 데이타 통신을 가능케하여 준다. 큰 네트워크를 형성하기 위하여 국부 지역 통신망(근거리 통신망, Local Area Network:LAN)들과 접속되어 있는 브릿지 노드들이 Pint-to-Point로 연결되어 레지스터 인서선 Backbone링을 형성한다. 본 논문에서 제안된 브릿지 노드는 불필요하게 데이타 메시지가 링으로 유입되는 것을 막기 위하여 Local Address Filtering을 하여 Backbone링의 통신량을 현저하게 줄이며, Remote Adress Filtering을 하여 LAN 세그먼트내의 통신량을 감소시키므로 그 성능 특성을 극대화 시킨다. 또한 본 논ㅁ누에서는 네트워크의 Reconfiguration을 쉽게 하기 위하여 자동 학습 기능이 고안되었다. 그리고 Throushput 분석에 의해서 Backbone 링에 사용되는 전송매체의 Bandwidth를 예측하여 설계하는 방법이 연구되었다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.69-74
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• 2011

In the curving detection method by using an accelerometer, the ride comfort in the first car is worse than one in the others due to spend the time to calculate the tilting command and drive the tilting mechanism after entering in the curve. In order to enhance the ride comfort in the first car, the preditive curve detection method which predicts the distance from a train to the starting point of curve by using the GPS, Tachometer, Ground balise and position DB for track. In this study, we predicted and evaluated the ride comfort for predictive curve detection method in transient curves according to the shape and dimension of transient curve and the various driving speed. Also, we predicted the improvement of the ride comfort for predictive curve detection method by comparing with the result of the ride comfort for predictive curve detection method and for curve detection method using an accelerometer in the short transient curve.

• 통상정보연구
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• 제12권3호
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• pp.197-221
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• 2010

China has experienced repid economic growth since it opened its economic market. Apparently, China tends to follow the worldwide trends and it plans to play a leading role in the world. As China has become a global manufacturing center as well as a manufacturing powerhouse with its high economic growth rate, China's logistics industry has entered a stage of fast growth and the demand of logistics infrastructure and third party logistics service are increasing rapidly. This study is to present some efficient entering strategies of Korean logistics firms in China by examining the current situations of logistics industry in China and some business strategies of international logistics firms in China. From the research which sees consequently investigated a various policy, a system and a law about chinese logistics industry and present condition of the Chinese goods enterprise and instance analysis of the large Chinese corporation that branch out to undeveloped markets led and a Chinese logistics industry and problem point escape hereafter the heightening of competitiveness plan which is rational under presenting boil.

• 한국환경과학회지
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• 제5권6호
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• pp.785-799
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• 1996

The incineration tests of mixed industrial wastes using the stoker type incinerator are carried out to investigate the partitioning characteristics of heavy metals during incineration. The results obtained from this study are as follow. The partitioning characteristics of heavy metals throughout this incinerator are found that, at given condition of $700^{\circ}C$, the elements with the relatively high boiling point such as Cr, Cu and Pb are partitioned into a bottom ash, a fry ash captured tv cyclone, and a flue gas stream, 67~88%, 2~19% and 6~16% of initial amount entering the incinerator, respectively, but the Cd and Hg of 75~81% is vaporized into the flue gas. It appears that the partitioning characteristics according to the particle size of ash is different between the bottom ash and the fly ash. For bottom ash, the fraction of partitioning into 75${\mu}{\textrm}{m}$ oversized particles is reatively high. For fly ash, the characteristics of distributions with the particle size can not be clearly shown.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 C
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• pp.1745-1747
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• 2002

This paper describes the effect of secondary surges entering low voltage side on the primary winding of pole transformers. After having connected the secondary winding by 4 different methods, surge voltages were applied to the low voltage side, and voltage waveforms were measured at a surge applied point and a high voltage bushing terminal. The measured voltages were compared by the waveform, magnitude and damping characteristics with each connection. As a result, the voltage waveforms induced by the secondary surges were different one another with each connection, especially, the conventional connecting method for 2 voltage sources was far different from the present method supplying only 1 voltage source in shape of the voltage waveform.

• 해양환경안전학회지
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• 제3권S1호
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• pp.55-73
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• 1997

It is well known that simulation study in the preliminary design stage of harbors or berths is of great use, since it can provide helpful informations to the designer from the view point of ship navigations. In this paper, a brief review is made in the safety assessment of ship navigation for a 320,000 DWT VLCC entering Yecocheon harbor area, which is carried out by shiphandling simulator system. The geographic data base for the harbor as well as the mathematical models of the ship and environmental effects are designed and developed. Based in the on-site inspections and interviews with pilots in Yeocheon area, basic maneuvering plans and consistence with real operation conditions. Berthing and deberthing maneuvering simulations as well as approaching and departing simulations are carried out by 3 experienced navigators according to the maneuvering plans and environmental scenarios. The simulation results are analysed in various ways to evaluate the quantitative and qualitative maneuvering difficulties and thereby to assess the safety of ship navigation in that area.

• 산업경영시스템학회지
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• 제26권1호
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• pp.61-73
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• 2003

With the chance of entering WTO, China is promoting the rebuilding of conformity assessment system in order to conform to WTO/TBT requirement and international conformity assessment system. Firstly, this research make it clear that the importance of conformity assessment activity, and the international movement of conformity assessment activity. Secondly, this paper surveyed the development course of conformity assessment activity and it's present operating system in China. Finally, this paper concludes the problems of present conformity assessment activity and implies the improving scheme. In the meantime, it also point out the later possible research topic in this field.

• 음성과학
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• 제7권4호
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• pp.83-90
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• 2000

The purpose of this study was to examine some acoustic characteristics in the ear canal. It was assumed that a sound outside the external auditory canal could be different from the sound inside the external auditory canal. The acoustic signals were captured by a probe microphone placed at a distance within 1 cm from the tympanic membrane, and a reference microphone was placed over the upper pinna. Three vowels /a/, /i/, /u/ were recorded from a normal adult male speaker. The parameters such as the formant frequency ($Fl\simF5$) and the peak intensity were measured using a speech analyser, PCquirer. It was found that the entering part of the external auditory canal functions as a narrowing point as to the speech that passes through the free field. Results show that acoustic characteristics were changed for speech discrimination rather than speech perception.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제9권2호
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• pp.153-173
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• 2005

Recently Bianshi problems, math isomorphic problems by changing the conditions, conclusions or deduction process of the three components of the example problem, are consistently identified as an important element in Chinese math education, characteristics in Chinese math education culture and form a hot point in China, 5 main factors related to reasons why is regarded as CULTURE characteristics in Chinese math education are discussed: (a) Exam goal (b) the curriculum objectives (c) traditional mode and conception, (d) Chinese situation, (e) Chinese math tradition.

• 대한전기학회논문지:전력기술부문A
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• 제50권8호
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• pp.351-358
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• 2001

This paper deals with the PSS modeling of Ulchin N/P #1 as well as the generator and excitation system modeling by utilizing the recorded data from AVR step test, which has been performed by entering small voltage signal into the AVR summing point. In addition to it. two recorded results obtained from the AVR step test with PSS sunning and without PSS running have not only been compared each other on the time domain, but also they heve been analyzed with FFT analysis on the frequency domain; thus, the desirable effects of running PSS in Ulchin N/P #1 on power system have been explicitly confirmed. Finally, the derived PSS model parameters lead to good matches between simulation results and recorded data.