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양상범,박한규 대한건축학회 2000 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.20 No.2
The purpose of this study is to suggest the considerations of the planning of the space through finding out the problems of current conditions of exterior space of church buildings within urban areas with questionnaires and practical investigations. The exterior spaces of most of the churches within urban areas are primarily used for parking or entrances, which means that they are used ineffectively. However the exterior spaces of churches should be used for the purpose and function of church, and they should have regional and situational characteristics and requirements of users. In this study, building churches in urban areas are studied according to the division of central commercial area, general commercial area, high and low crowded dwelling area, and the ways for planning churches are shown with the analysis of individual using pattern. Complexity, flexibility and openness should be reflected to building churches for different uses of exterior spaces and regional characteristics should have effect on building churches.
철도교대 뒤채움재료의 시멘트 혼합 비율에 따른 강도 및 침하특성 분석
최찬용,양상범,김낙경,김태균 한국지반공학회 2016 한국지반공학회논문집 Vol.32 No.9
Backfill materials of rail abutment were commonly composed with cement treated aggregate, general aggregate andsoil. The friction angle of cement treated aggregate increased up to 40° or more due to strength enhancement. However,30°~35° of friction angle was typically applied for in-situ condition. This phenomenon could cause over-designing,therefore, it is essential to determine reasonable material properties of cemented treated aggregate. In this study, a seriesof CBR tests and circular model tests have been conducted for cement treated aggregate, while changing cement mixingratio. Based on test results, characteristics of settlement and strength have been analyzed quantitatively. The settlementof cement treated aggregate decreased with the number of cyclic loading and aging period. In addition, The strengthincrement ratio in CBR test increased up to 13~16 times at 28 days aging.
딥 러닝에 의한 전동기 기계적 고장 수준 결정을 위한 전동기 진동/전류 데이터 특성 분석 연구
한지훈(Ji-Hoon Han),박상욱(Sang-Uk Park),홍선기(Sun-Ki Hong) 대한전기학회 2021 전기학회논문지 Vol.70 No.10
In the classic motor fault diagnosis system, a method of analyzing the differences between the normal and collected state signals of the motor to be diagnosed was used and the method can diagnose only the limited situations because the diagnosis is based on the frequency of the mechanical failure. In order to compensate for this, some studies on a system that performs more specialized fault diagnosis through deep learning algorithms were carried out. However, the level of failure cannot be determined because these studies consider only the signals that have a great influence on motor operation. To solve this problem, the characteristics of vibration and current signals are analyzed to develop a deep learning algorithm suitable for fault level determination. The characterized signals are used for fault diagnosis and prediction. Fault diagnosis based on vibration signal is carried out through DT-CNN (Decision Tree Convolutional Neural Network). In addition, it is checked whether the current signal in the initial failure state, which is relatively insensitive to failure, can be classified through a deep learning algorithm. The proposed data utilization performance was evaluated through an induction motor and the analyzed signal-based fault diagnosis system is expected to enable a more precise diagnosis compared to the existing system.
김응석 ( Eung Seok Kim ),심규범 ( Kuy Bum Sim ),양상용 ( Sang Yong Yang ),윤조희 ( Jo Hee Yoon ),갈병석 ( Byung Seok Kal ),손인욱 ( In Ook Son ),최현일 ( Hyun Il Choi ) 한국물환경학회 2012 한국물환경학회지 Vol.28 No.6
This study has evaluated the trophic state in Daecheong Lake by Carlson (1977) method, Aizaki (1981) method, Yang and dickman (1993) method, and Korean trophic state index method. For estimating the trophic state index from each analysis method we use water quality factors such as COD, TN, TP, Chl-a, and SD provided by the water information system and the ministry of environment. The seasonal lake trophic state results denote the mesotrophic state lake from Carlson (1977) method, Aizaki (1981) method, and Korean trophic state index method and the high relation between Carlson (1977) method and Aizaki (1981) method with the coefficient of determination R2 greater than 0.9 for all the seasons. Although Korean trophic index method has relatively weak relation to other methods with the coefficient of determination R2 ranging from 0.419 to 0.701, we propose that Korean trophic index method is suitable for use in domestic lakes since Korean trophic index results show the similar periodicity and tendency with other method results. Hence, Korean trophic index method incorporating domestic lake characteristics is expected to can contribute to seasonal water quality management measures in lakes.
최찬용,김현기,정근영,양상범 한국지반공학회 2015 한국지반공학회논문집 Vol.31 No.9
In this study, track dynamic interaction characteristics caused by the vehicle running through transitional section such as bridge abutments were studied using the finite element analysis program. The geometric condition of track was generatedby trigonometric function and allowable maximum track irregularity is determined by KORAIL track maintenance criteria.The sub-infrastructure under rail fastener system was modelled by 3D solid elements. To reduce computational costonly half track line is numerically considered and the roller boundary condition was applied to each side of model.In this study, the vehicle-track dynamic interaction analysis was carried out for standard Korean transition section ofconcrete track and the dynamic behaviors were investigated. The dynamic characteristics considered are wheel load variation, vertical acceleration at body, and maximum Mises stress at each part of transitional section.
최찬용(Chanyong Choi),김현기(Hunki Kim),양상범(Sangbeom Yang),엄기영(KiYoung Eum) 한국지반신소재학회 2015 한국지반신소재학회 논문집 Vol.14 No.4
원형모형실험을 통해 철도노반재료로 사용되는 흙을 대상으로 함수비 변화에 따른 침하관계를 평가하였다. 초기 함수비에서 침하량비(Re)는 2.08이었으나, 초기함수비보다 2배 이상으로 함수비가 증가되었을 때 침하량비(Re)는 4.06으로 4배 이상의 침하가 발생하였다. 또한 실제 공용중인 콘크리트궤도에서 계측된 강우데이타를 기반으로 약 1년여간 현장에 매설된 함수비 측정장비를 통해 장기 함수비 변화추이를 관찰하였다. 콘크리트궤도의 직하부에 위치한 함수비는 강우강도에 따라 변화가 거의 없는 수준이며, 사면부에서는 최대 강우강도 20mm/hr가 초과되는 경우 약 4% 정도의 함수비 변화가 생기는 것을 볼 수 있다. 이러한 변화정도를 볼 때 콘크리트 궤도의 경우 배수성능이 적절히 유지된다면 노반 내부의 함수비 변화는 강우에 대하여 영향이 매우 미비할 것으로 판단된다. In this study, it was performed in characteristics of settlement of roadbed materials with variation of water content using cylinder model device. The ratio of settlement (Re) of subgrade soils in the initial water content were about 2.08, whereas it was increased about 4.06 which resulted in increase two times in the initial water content. Also, it was monitoring long-term to measure variation of the field water contents at concrete track using rainfall measuring sensors. The water content at directly underneath of concrete track rarely seems to affect the variation of water content, but it was increased by about 4% than intial water content with 20 mm/hr rainfall index at slope section. As for the result from the field date, it was determined that the water content of the inner subgrade layer was rarely affect caused by more than 20 mm/h rainfall index during if good drainage system at concrete track properly maintained.