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컴퓨터에 의한 임의의 線型 디지탈回路網의 極點과 零點의 結定에 관한 硏究
김환용,황형수,양해권 원광대학교 공업기술개발연구소 1984 工業技術開發硏究誌 Vol.4 No.-
A New method for poles and zeros determination between any two nodes of a linear time-invariant single-input single-output/multi-input multi-output one dimensional arbitrary digital network is proposed in this paper. It could be used for frequency domain analysis. Computational results show that this is more computationally accurate efficient, and requires less computer execution time and storage than the direct Computation method and the simplified eigenvalue method.
김환용,박철희,김민지,김여은,이동훈,이영경,황호경 대한초음파의학회 2013 ULTRASONOGRAPHY Vol.32 No.4
Herniation of the appendix into an inguinal canal is known as an Amyand hernia. Due to its nonspecific symptoms, clinical diagnosis is extremely difficult, and an accuratepreoperative diagnosis of Amyand hernia with ultrasound (US) and CT is rarelyreported. Herein, we reported a typical case of Amyand hernia in a 74-year-old malein which the correct diagnosis was made using inguinal US and contrast-enhancedabdominopelvic CT. US and CT findings of Amyand hernia showed a target-like tubularstructure within the inguinal canal. 충수돌기가 서혜관(inguinal canal)내부로 탈장을 일으키는 경우 Amyand 탈장이라고 한다. Amyand 탈장은 비특이적인 증상으로 인해 임상적으로 진단이 매우 어렵고, 초음파와 전산화단층촬영(Computed tomography, 이하CT)으로 진단되었던 예는 매우 드물다. 이에 저자들은 초음파와 CT를 통해 진단된 74세 남성의 Amyand 탈장 1예를 경험하여 이를 보고하고자 한다. Amyand 탈장은 초음파와 CT에서 서혜관 내에 위치하는 맹관 형태의 가는관상 구조물로 보였다.
농촌마을종합개발사업에서 상하수도시설의 합리적 계획방향에 관한 기초적 연구
김환용 한국농촌건축학회 2006 농촌건축 : 한국농촌건축학회논문집 Vol.8 No.23
This study on the rational planning of water supply and sewage system for rural village development projects. Present, when establishment and standard about maintenance of water supply and sewage system were not presented in rural village synthesis development projects, it is real condition that service industry is depending on presenting simple plan in basis planning phase and business enforcement step. This study wishes to present basic data so that can be planned more rationally and enforce and contribute in rural village synthesis development projects water supply and sewage system that is enforced as part of rural village synthesis development projects.
철도인프라 BIM 적용에 따른 비용편익 효과 분석- 오송 철도종합시험선로 사례를 중심으로 -
김환용,신민호,한상천,최영우,김창호 한국BIM학회 2018 KIBIM Magazine Vol.8 No.4
Recent technological improvements have made abundant changes in construction industry. In specific, some technical applications, such as Building Information Modeling (BIM) opens up many possibilities. Some studies have articulated the use of BIM and its advantages in construction, but most of them are theoretical, not practical. This study is to provide an insight to such obstacles in BIM research. By investigating a real project that could utilize BIM in planning and construction phases, the authors try to investigate a possible outline of advantages in BIM implementation. The study area was set to a railway construction site in South Korea. The site covers a multiple railway tracks, stations, telecommunication facilities, infrastructure facilities, railway structures, and so numerous. In the site, the authors have identified 12 errors in 7 projects that could be prevented if BIM was utilized before the construction.
ATM 망의 비연결형 서버를 위한 신경망 연상 메모리 설계
김환용,임순자 원광대학교 공업기술개발연구소 1997 工業技術開發硏究誌 Vol.17 No.-
Streaming mode connectionless server for wide area ATM networks which must be performed transmission, reception and lookup with time restriction during the transmission time of a single cell has the demerit of much cell loss in case that burst traffic occurs. Therefore, in this paper to decrease cell loss and precess the large amount of data of streaming mode connectionless server at high speed, content addressable memory(CAM) using neural network algorithm is proposed. To overcome problems of area and power dissipation in forwarding table using conventional CAM, the proposed neural network CAM is designed to increase linearly address storage bit about increase of address input bit. Its design and simulation is performed by using Verilog-HDL and Compass Tool.
A Study on Winter Season Measurement Results to cope with Dynamic Pricing for the VRF System
김환용,김민석,이제헌,송영학 대한건축학회 2015 Architectural research Vol.17 No.3
The dynamic pricing of electricity, where the electricity rate increases in a time zone with a high demand for electricity is typically applied to a building whose power reception capacity is greater than a certain size. This includes the time of use(TOU) electricity pricing in Korea which can induce the effect of reducing the power demand of a building. Meanwhile, a VRF (Variable Refrigerant Flow) system that uses electricity is regarded as one of the typical heating and cooling systems along with central air conditioning (central HVAC) for its easy operation and application to the building. Thus, to reduce power energy and operating costs of a building in which the TOU and VRF systems are applied simultaneously, we suggested a control for changing the indoor temperature setting within the thermal comfort range or limiting the rotational speed of an inverter compressor. In this study, to describe the features of the above-mentioned control and verify its effects, we evaluated the results obtained from the analysis of its operation data. Through the actual measurements in winter operations for 73 days since mid- December 2014, we confirmed a reduction of 10.9% in power energy consumption and 12.2% in operating costs by the new control. Also, a reduction of 13.3% in power energy consumption was identified through a regression analysis.
공동주택 거실의 설계변수에 따른 통기륜도 변화의 민감도에 관한 연구
김환용 대한건축학회지회연합회 2014 대한건축학회연합논문집 Vol.16 No.4
공동주택에서 자연통풍을 적극적으로 활용하기 위해 실내로 유입되는 기류는 건물의 높이, 방위, 개구부의 크기, 형태 및 배치, 실내 공간 구획 등에 의해 변화한다. 본 연구에서는 공동주택의 거실을 대상으로 실내기류에 영향을 미치는 설계변수를 변화시켜 통기륜도의 민감도 변화를 분석하여 실내 공간 계획 시 효과적으로 통풍을 적용할 수 있는 대안을 제시하는 것을 목적으로 하였으며, 결론은 유입구의 위치에 따라 발코니 창 개폐방향에 따른 통기륜도는 대체적으로 발코니 왼쪽 창을 오픈하였을 때 실 전체로 기류가 유입되고 있으나 유입구가 유입면의 오른쪽에 위치할 경우에는 유입구와 발코니 창이 엇갈리게 배치하는 것이 통기륜도 형성에 유리하다. When designing the apartment house, natural ventilation has been accepted for comfortable environment and saving energy for cooling load. The generation of indoor air is entering direction, the height and opening the size and layout, interior space and the compartment by the changes. Therefore, in this study and the direction of the apartment floors indoor thermal environment based on the measurement, ventilation, and a comparative analysis of performance, ESP-r CFD using indoor air affects the design parameters by changing the effective purpose of the way of cross ventilation to form shall be. The conclusion follows. Design parameters due to changes in the analysis of the way of cross ventilation are as follows. In addition to the open balcony windows to the left the entire room air distribution is considered to be effective.
농촌마을종합개발사업에서 상하수도시설의 합리적 계획방향에 관한 기초적 연구
김환용 한국농촌건축학회 2006 농촌건축 : 한국농촌건축학회논문집 Vol.8 No.2
This study on the rational planning of water supply and sewage system for rural village development projects. Present, when establishment and standard about maintenance of water supply and sewage system were not presented in rural village synthesis development projects, it is real condition that service industry is depending on presenting simple plan in basis planning phase and business enforcement step. This study wishes to present basic data so that can be planned more rationally and enforce and contribute in rural village synthesis development projects water supply and sewage system that is enforced as part of rural village synthesis development projects.