直接踞離測量에 依한 登降測의 精度比較

李成泰,安元植 건국대학교 1973 學術誌 Vol.16 No.2

There are two ways in surveying distance, Direct Method and Indirect Method. In our Direct Chaining Surveying, we compared the degrees of accuracy, of chaining up and down Hill shown at various levels of slope 5˚, 10˚, 15˚, 20˚, 25˚ using Eslone tape. 1.Between 5˚ and 25˚ the accuracy of chaining up Hill marks about 1/1,300-1/540, while the accuracy chaining downs Hill marks about 1/340-1/700. and these accuracies change in a straight line. 2.The accuracy of chaining down Hill is higher than that of chaining up Hill. 3.At steep slope above 30˚ the accuracy of chaining up Hill shows almost the same as that of Stadia surveying.

고출력 전자 패키지 기판용 고열전도 h-BN/PVA 복합필름

이성태,김치헌,김효태 한국마이크로전자및패키징학회 2018 마이크로전자 및 패키징학회지 Vol.25 No.4

High thermal conductivity films with electrically insulating properties have a great potential for the effective heat transfer as substrate and thermal interface materials in high density and high power electronic packages. There have been lots of studies to achieve high thermal conductivity composites using high thermal conductivity fillers such alumina, aluminum nitride, boron nitride, CNT and graphene, recently. Among them, hexagonal-boron nitride (h-BN) nano-sheet is a promising candidate for high thermal conductivity with electrically insulating filler material. This work presents an enhanced heat transfer properties of ceramic/polymer composite films using h-BN nano-sheets and PVA polymer resins. The h-BN nano-sheets were prepared by a mechanical exfoliation of h-BN flakes using organic media and subsequent ultrasonic treatment. High thermal conductivities over 2.8 W/m·K for transverse and 10 W/m·K for in-plane direction of the cast films were achieved for casted h-BN/PVA composite films. Further improvement of thermal conductivity up to 13.5 W/m·K at in-plane mode was achieved by applying uniaxial compression at the temperature above glass transition of PVA to enhance the alignment of the h-BN nano-sheets. 최근 고집적 고출력 전자 패키지의 효율적인 열전달을 위한 기판 및 방열소재로서 절연성 고열전도 필름의 수요가 커지고 있어, 알루미나, 질화알루미늄, 질화보론, 탄소나노튜브 및 그래핀 등의 고열전도 필러소재를 사용한 고방열복합소재에 대한 많은 연구가 이루어지고 있다. 그 중에서도 육방정 질화보론(h-BN) 나노시트가 절연성 고열전도 필러소재로서 유력한 후보 물질로 선택되고 있다. 본 연구는 이 h-BN 나노시트와 PVA로 된 세라믹/폴리머 복합체 필름의 방열특성 향상에 관한 것이다. h-BN 나노시트는 h-BN 플레이크 원료 분말을 유기용매를 사용한 볼밀링과 초음파 처리에의한 물리적 박리공정으로 만들었으며, 이를 사용한 h-BN/PVA 복합 필름을 제조한 결과 성형된 복합필름의 면방향과 두께방향 열전도도는 50 vol%의 필러함량에서 각각 2.8 W/m·K 및 10 W/m·K 의 높은 열전도도가 나타났다. 이 복합필름을 PVA의 유리전이온도 이상에서 일축 가압하여 h-BN 판상분말의 얼라인먼트를 향상시킴으로써 면방향 열전도도를 최대 13.5 W/m·K까지 증가시킬 수 있었다.

고속 4-2 compressor

이성태,김정범 강원대학교 정보통신연구소 2010 정보통신논문지 Vol.14 No.-

4-2 compressor는 곱셈기의 부분 곱 합 트리(partial product summation tree)의 기본적인 구성요소이다. 본 논문은 고속 연산이 가능한 4-2 compressor 구조 두 개를 제안한다. 제안한 첫 번째 회로는 최적화된 XOR-XNOR와 MUX로 구성하였고, 지연시간이 32.2% 감소하였다. 제안한 두 번째 회로는 한 개의 전가산기와 MUX로 구성하여, 6.3%의 전력소모가 감소하였다. 이 두개의 회로는 기존의 회로와 비교하였을 때 회로 구성에 필요한 트랜지스터수가 12개 감소하였다. 제안한 회로들은 Samsung 0.18um CMOS 공정을 이용하여 설계하였으며, HSPICE를 통하여 검증하였다.

Automatic Level C3의 測定誤差에 對한 硏究

李成泰 建國大學校附設 農業資源開發硏究所 1975 論文集 Vol.1 No.-

A Study of Measuring Errors of Automatic Level C3 Recently the uses of automatic level is popular because of its handy operation and its comparatively being of better function. This study is to find out the measurement error and the accuracy in the experiment with the automatic level C3. The results are summarized as follows; 1. The air bubble in the circular level has to be within the red circle on glass and at least touched internally to the line. 2. When the same leveling rod is measured and observed considerably long period, the collimation error is approximately of 4" resolving power of the telescope and proportional to the collimation distance. 3. In case of Common leveling once setting error is proportional to the collimation distance and the accuracy of the Automatic level Compensator is 2-9" 4. The error of closure in leveling is getting smaller as the collimation distance is getting shorter. 5. If the collimation distance is within 60m, the error of closure is less than 10 √Lmm, which is the allowable limit of the second order leveling in Korea. 6. The level used in this experiment was belong to 3rd class.

傾斜地에 있어서의 步測에 관한 硏究

李成泰 건국대학교 1972 學術誌 Vol.14 No.1

This experiment was performed in pacing up hill and pacing downhill to carry out the pacing experiment at incline land after establishing seven distriets : O (level), 5˚, 10˚, 15˚, 20˚, 25˚, 30˚. more incliner, more decreaser in step-length. Also the occasion of pacing up hill, in some degree of incline, decrease more than that of pacing down hill. The results of experiment are as follows. 1.The horizontal distance in some district of incline come to that constant which is gained here times constant of the article 3 in table 2 and average step-length. 2.The occasional of pacing up hill of incline in 30 decrease than level land by 1/2 3.The step-length in pacing up hill equal to 80% of that in pacing down hill 4.The accuracy of pacing in level land is roughly 1/200 and 1/100 in 30˚. 5.The selection of pacing downhill is profitable than pacing uphill in possible.

강제진동을 받는 강판 콘크리트 (SC) 벽체에서 스터드의 성능평가를 위한 해석적 연구

이성태 한국구조물진단유지관리공학회 2016 한국구조물진단유지관리공학회 논문집 Vol.20 No.3

이 연구에서는 SC 전단벽의 전단 연결재인 스터드의 배치와 형상이 SC 전단벽의 거동에 미치는 영향을 살펴보기 위해 전단벽체가 강제진동을 받을 때의 거동을 해석적으로 검토하였다. 이를 위해 서로 다른 배치간격과 형상의 스터드가 배열된 SC 전단벽을 대상으로 유한요 소해석을 수행하였다. 그 결과, 시간이력해석으로부터 구한 감쇠비가 파워반감대역폭법이 전반적으로 높게 그리고 적합지수함수법이 가장 낮은 수준으로 산정했으며 설계강도 절반정도에서의 감쇠비는 3.0~4.2%로, 설계강도에서는 4.1~5.2%로 나타남을 알 수 있었다. 또한, 개선된 스터드를 사용할 때, 감쇠비가 약간 감소하였고 DS1과 DS2 간에는 일관된 결과가 나타나지 않았다. 스터드의 간격이 필요이상 증가할 경우, 고유진동수가 감소하고 감쇠비가 증가함을 확인하였다. This study analytically reviewed the behavior of steel plate concrete (SC) walls subjected to forced vibration to investigate the effects of shape and arrangement spacing of studs on the behavior spacing of studs in SC wall were carried out. From the analyses, it was noted that the damping ratio obtained from the time history analyses showed overall high value in Half-power Bandwidth method and the lowest value in Fitted Exponential Curve method. And, in half of the design strength, the damping ratio presented approximately 3.0~4.2% and, in the design strength, it was approximately 4.1~5.2%. When the developed studs were used, the damping ratio was reduced slightly and it did not show consistent results between DS1 and DS2. When the distance between the studs increases more than necessary, it was also confirmed that the natural frequency was reduced and the damping ratio was increased.

척추결핵의 KANEDA기구를 이용한 전방융합술 : Cases Report

이성태,장석정,안태형,도성신,신호 대한신경외과학회 1989 Journal of Korean neurosurgical society Vol.18 No.6

We reported 2 cases of tuberculous spondylitis and its treatment was improved with anterior interbody fusion by a KANEDA instrument. The patients were early ambulation without any complications and sequalaes.

水溶液에서 이온 交換樹脂에 依한 페놀의 除去

李成泰,鄭在灌 成均館大學校 科學技術硏究所 1988 論文集 Vol.39 No.2

The use of ion exchange resins for removing phenol from municipal and industrial wastewaters is increasing because more is becoming known about the capacities of resins that have been available for some time and also because a wider variety of resins are now being manufactured by industry. The liquid-solid type reaction encountered in this study is influenced by the presence of resistance as a result of film diffusion and by the effect of reactor inside diameter. Therefore, these diffusional resistance and effect of reactor inside diameter should be minimized to establish the optimal operating conditions. This investigation was an attempt to eliminate these diffusional influence and effect of reactor inside diameter, and to determine the reaction kinetics of the removal of phenol from aqueous solutions by three kinds of ion exchange resins(DIAION WA30, PA408, and PA412). The results were as follows: 1) Under the conditions of flow rate of 211㎤/min and of reactor inside diameter of 33mm, the diffusional resistance was minimized and the initial rate of phenol removal was maximized. 2) The effect of pH on the removal of phenol was increased between pH 4 and 10 for PA408, between pH 5 and 10 for PA412, and at pH 10 for WA30. 3) The reaction kinetics studied in this experiment for the resins may be summarized as follows: WA30 : r = 0.0245C_e^1.01 - 0.2085q_e^0.76 PA408 : r = 0.0315C_e^1.22 - 0. 0913q_e^0.77 PA412 : r = 0.0424C_e^1.08 - 0.0762q_e^0.94 4) From batch studies empirical Freundlich isotherm could be expressed as follows: WA30 : q_s = 0.254C_s^1.02 PA408 : q_s = 1.774C_s^1.03 PA412 : q_s = 1.871C_s^1.30

A Study on Game Image Element Control Implementation through Emotion Recognition

이성태 (사)한국컴퓨터게임학회 2018 한국컴퓨터게임학회논문지 Vol.31 No.1

Immersion degree for game is one of the key factors in playing game. Immersion in game playing, cut-scene is important factor. Game is made up of many elements. The elements of game that the player directly experiences can be divided into graphic, story, interface, sound and so on. Among these, cut-scenes tell the story of game and it is a important factor in the experience of fun and inspiration. Most games, every player experience same cut-scene. In this paper, we enhance emotion of contents based on the emotion models established in psychology. We experimented to extract the emotion of the player before each cut-scene and apply it to the image control. The emotional extraction interface is based on “Russell's circumplex model of affect”, and representative emotions were extracted and implemented. The color value of the game cut-scene is changed to each player, through the color of the color pattern matched with emotions. We experience the interface that can check the emotion of player in each play times. According to emotion of player, cut-scene is changed. In the meantime, many papers and case the immersion of game has been emphasized. Out research can be applied to a variety of games. This attempt will enhance the player's immersion into the game.

測量用 Eslone Tape의 適正使用法에 관한 硏究

李成泰 건국대학교 1968 學術誌 Vol.9 No.1

In recently Eslone Tape (P.V.C. Coated fiber glass) has been used increasingly in a tool of measuring distance. If we found out fit using method of this tape, we could measure more accurate distance surveying. In order to achieve this purpose, elongation about the same kind of three tape is experimented under the each tension from 1kg to 10 on the 30m Horizontal plane and at the same time sagging is calculated under each tension by selfish load. As a result, considering elongation and sagging to be (+) and (-) error, it is known the right tension as the elongation of the errors.