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김양한(Yang-Hann Kim),최정우(Joung-Woo Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
In this paper, we aim to control the sound field spatially, so that a desired or target acoustic variable is enhanced within a zone where the listener is located. This is somewhat analogous to have manipulators that can draw sound picture in any place we want. In order to manipulate sound field over a finite area in space, it is essential to control multiple sound sources. With all these regards, we propose a unified approach that can manipulate selected acoustic variables using multiple sources. However, the shape or color of the sound picture fully depends on the acoustic variable we want to enhance. Among the many possible choices, we focus on three acoustic variables that have to do with the magnitude and direction of sound: acoustic potential energy, sound intensity, and direction of wavefront. Various numerical and experimental results of the proposed methods certainly validate that we can draw our own sound picture in space and time.
과도 안정도를 고려한 가용송전용량(ATC) 계산에 관한 연구
김양일(Yang-il Kim),정성원(Sungwon Jeong),김재현(Jaehyeon Gim) 대한전기학회 2009 전기학회논문지 Vol.58 No.3
In recent years, electric power systems have been experiencing a rapid change due to the increasing electricity market. For the effective use of power system under the deregulated environment, it is important to make a fast and accurate calculation of the maximum available transfer capability(ATC) from a supply point to a demand point. In this paper, the purpose of this research is to calculate ATC fast and accurately for securing the stability of system and raising the efficiency as a result of anticipating transmission congestion according to transmission open access progressed in the future under the regulated environment of electricity market. In this paper, a study utilized a relation of the potential energy and energy function by which calculated CCT and then utilized a relation of PEBS for transient stability ATC calculation. In this paper, ATC was calculated as RPF and Energy Function method and calculation results of each method was compared. Contingence ranking method decided the weak bus by the Eigenvalues of Jacobian matrix and overloading branches by PI-index. As a result, a study proved the fast and accurate ATC calculation method considering transient stability suggested in this paper. Through the case study using New England 39 bus system, it is confirmed that the proposed method can be used for real time operation and the planning of electric market.
제올라이트와 구리 분말을 혼입한 모르타르의 기초 물성 평가
김일순 ( Kim¸ Il-sun ),이재욱 ( Lee¸ Jae-wok ),김우현 ( Kim¸ Woo-hyun ),최소영 ( Choi¸ So-yeong ),양은익 ( Yang¸ Eun-ik ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
본 연구에서는 제올라이트와 구리 분말이 동시에 혼입된 모르타르의 플로, 휨 강도, 압축 강도 및 염화물 침투 저항성을 평가하였다. 실험결과, 모르타르의 플로 값은 모든 배합에서 기준 배합보다 약 9% 이내로 감소하는 경향을 나타내었다. 모르타르의 휨 및 압축 강도는 재령 91일에 기준 배합보다 증가하는 경향을 나타내었다. 염화물 침투 저항성은 기준 배합보다 확산계수가 감소하는 경향을 나타냈다. 제올라이트의 포졸란 반응과 유효 물-결합재비 감소가 강도와 염화물 침투 저항성에 영향을 준 것으로 판단된다.
실천신학적 접근에 의한 한국교회 설교 현장 분석과 윤리적 설교 실행에 관한 연구
김양일(Yang-Il Kim) 영남신학대학교 2016 신학과 목회 Vol.46 No.-
Today is not only the age of changing but also of crisis. The incredible development of civilization has led to remarkable changes but appropriate responding to them lacks, causing various problem in the entire society. In addition, the church facing these situations are not free from it, and the real problems arising from those jeopardize the status of the church. Rather, people’s lives are abundant, and things which were considered as impossible in the past become now easily available ones in daly lives. However, our spirits seem not to experience these bodily abundance at the same time. People’s souls become poorer and devastated than before and news about lots of accidents from them are delivered to us via mass media. The church"s responsibility for this reality is heavier. And in the middle of this responsibility, the role of mission of preaching is located. This article tries to analyze these situations of the time based on four core tasks of the famous Christian educationalist and practical theologian, Richard R. Osmer"s Practical Theology. According to four tasks of the descriptive-empirical task, the interpretive task, the normative task, and the pragmatic task suggested by Osmer, today’s situations are analyzed and understood. Then, based on theology of ethical preaching by Charles L. Campbell, solutions for the age of crisis are sought according to discussions of theology of preaching. And specific solutions for today’s the age of crisis are made according to suggestions from Campbell’s theology of preaching. In this age of crisis, the church has faced complex and difficult crises which cannot be solved by simply one or two suggestions. However, the recovery of mission of preaching, one of the most important ones in the church will be a meaningful step for overcoming these crises. In the time of the broken ethics and norms and needs of recovery of perfect order, attempt for preaching to recover evangelical ethics will be surely one of meaningful efforts.
구리 분말과 피톤치드를 혼입한 모르타르의 기초 물성 평가
김일순 ( Kim¸ Il-sun ),김우현 ( Kim¸ Woo-hyun ),이재욱 ( Lee¸ Jae-wok ),최소영 ( Choi¸ So-yeong ),양은익 ( Yang¸ Eun-ik ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
본 연구에서는 구리 분말과 피톤치드가 동시에 혼입된 모르타르의 플로, 휨 강도, 압축 강도 및 염화물 침투 저항성을 평가하였다. 실험결과, 플로 값은 기준 배합 대비 약 2% 내외로 감소하거나 증가하는 경향을 나타내었다. 모르타르의 휨 및 압축 강도는 기준 배합과 유사한 경향을 나타내었다. 염화물 침투 저항성에서는 확산계수가 기준 배합보다 감소하는 경향을 나타내었고, 구리 분말의 혼입율이 증가할수록 확산계수가 증가하는 경향을 나타내었다. 중금속인 구리 분말이 전도체 역할을 하여 염화물 침투 저항성에 영향을 준 것으로 판단된다.