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유인근,이형권 대한전기학회 1986 전기의 세계 Vol.35 No.11
직류송전은 선로의 건설비가 저렴하고 안정도의 문제가 없어 대전력 장거리송전이 가능하며, 비동기 연계를 할 수 있고, 조류제어가 신속.용이할 뿐만 아니라 단락용량을 증가시키지 않고도 계통의 연계강화가 가능한 점등의 잇점이 있으며, 특히 케이블 송전에 매우 유리한 송전방식이다. 그러나 선로의 건설비는 교류송전방식에 비해 저렴한 반면, 교직변환소의 건설비가 고가이므로 소용량 근거리 송전에는 경제성이 없으며, 고조파 및 고주파 장해대책이 필요하고, 전력계통 구성의 자유도가 떨어지는 점등의 문제가 있다. 본고에서는 직류송전의 역사적 배경과 설비의 현황, 운전실적 및 연구추진현황, 금후의 전망등에 관해서 기술하였다.
보의 유효깊이와 전단철근간격에 따른 철근콘크리트보의 전단강도에 관한 연구
유인근,박나정,백승민,김우석,곽윤근 대한건축학회 2020 대한건축학회논문집 Vol.36 No.11
Although many studies have been conducted on some factors (i.e., tensile reinforcement ratio, shear span-to-depth ratio, concrete compressivestrength, and beam width-to-depth ratio) affecting the shear strength of concrete, studies on the effect of the cross-sectional size on the shearstrength have not been achieved. For this reason, the purpose of this study is to conduct a study on the shear strength of reinforced concretebeams according to beam effective depth and shear reinforcement spacing. Based on these experimental results, the authors intend to usethem as basic data for shear design of reinforced concrete beams by comparing and analyzing theoretical values by standard equations suchas KBC 2016 and ACI 318-19 as well as proposed equations. As a result, each series of No.2 specimens (SH1-2, SH2-2 and SH3-2) with max = 0.67d (d/s = 1.5) similar to max= 0.7d by the CSA standard is 1.00 to 1.41. It was found that the current standard for shear bars =d/2 may be somewhat relaxed, but additional studies are needed to reflect this in the Korean Building Code. 본 연구에서는 보의 유효깊이와 전단철근간격에 따른 철근콘크리트보의 전단강도에 관한 영향을 분석하기 위해 인장철근비(ρ=0.025), 폭 대 깊이 비(h/b=1.5)와 전단경간비(a/d=2.5)를 일정하게 하였고, 단면의 크기와 전단철근비를 변수로 하여 전단실험을 하였다. 실험결과를 분석하여 다음과 같은 결론을 도출하였다. KBC2식을 기준으로 전단철근을 배근한 시험체만을 대상으로 한 경우에는, 이론값에 대한 실험값의 비가 0.85 ~ 1.29로 나타났다. 특히, CSA 기준에서 요구하는 = 0.7d와 유사한 S=0.67d (d /s=1.5)인 각 시리즈 2번 시험체(SH1-2, SH2-2, SH3-2)에서는 1.17 ~ 1.29로 나타나 전단철근에 대한 현행기준 = d /2는 다소 완화시켜도 될 것으로 판단되지만, 이를 기준에 반영하기 위해서는 추가적인 연구가 필요하다.
전력계통에서의 전문가 시스템을 도입한 발전기 기동정지 계획 산법에 관한 연구
유인근 國立 昌原大學校 産業技術硏究所 1989 産技硏論文集 Vol.3 No.-
An expert system based algorithm to solve the problem of short-term unit commitment is presented. The general scheme of the algorithm is Hybrid Dynamic Programming which includes a couple of modified techniques in comparison with Dynamic Programming, namely, search-and-selection method based on the priority order of generation units, and state reconciliation approach that consider the secondary states as well as the primary one in the solution procedure by dynamic programing for the purpose of guarantee on the existence of feasible solution all the time and the computational problem is solved using load variation rates of each step, and security function is also introduced to take generation system reliability into account. In addition to the above-mentioned scheme, an expert system approach is applied to assist operators in scheduling the operation of generating units. Especially, for the effective handling of several necessary constraints which must be considered in the solution procedure and have a great influence on the results, that is, start-up and down cost of units, minimum and maximum run time, minimum down time, the number of possible start-up of a generating unit daily, transmission line over-load and crew constraint etc., the knowledge of an experienced power system operator were taken into account through an expert system rule base which provides information in response to questions raised by system operator to improve the results by indicating how to adjust input data and relax the constraints. The effectiveness of the proposed algorithm has been demonstrated by applying it to a model power system.
유인근,윤여완,양극영 원광대학교 2004 論文集 Vol.33 No.-
This study aims to evaluate the feasibility of remodeling business by predicting the future price of apartment house after remodeling using Hedonic Price Model. The data concerning such 8 independent variables as location, unit size, unit plan, landscape, parking, the number of elapsed years after completion, number of units, brand per apartment unit from 25 regions in Seoul metropolitan city were collected and evaluated by established evaluation criteria. The coefficients affecting the price of apartment unit were made by way of linear multi-regression and put into Hedonic Price Model. The feasibility evaluation model for apartment was made and verified by data of remodelled apartment. The predicted results using suggested evaluation model coincide with actual apartment market situations.