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무변압기형 태양광 인버터의 출력 전류 DC offset 제거 방법
홍기남,최익,최주엽,이상철,이동하,Hong, Ki-Nam,Choy, Ick,Choi, Ju-Yeop,Lee, Sang-Chul,Lee, Dong-Ha 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.suppl3
Since PV PCS uses output current sensor for ac output current control, the sensor's sensing value includes unnecessary offset inevitably. If PV inverter is controlled by the included offset value, it's output current will generate DC offset. The DC offset of output current for trans-less PV inverter is fatal to grid, which results in saturating grid side transformer. Usually DSP controller of PV inverter reads several times sensing value during initial operation and, finally, it's average value is used for offset calibration. However, if temperature changes, the offset changes, too. And also, the switch device is not ideal, both each switching element of the voltage drop difference and on & off time delay difference generate DC offset. Thus, to compensate for deadtime and the switch voltage drop, feedback control by output current DC offset should be provided to compensate additional distortion of the output current. The validity of the proposed method is confirmed through PSIM simulation.
홍기남 ( Ki Nam Hong ),한상훈 ( Sang Hun Han ),박재규 ( Jae Kyu Park ),정규산 ( Kyu San Jung ),김성보 ( Sung Bo Kim ) 충북대학교 건설기술연구소 2014 建設技術論文集 Vol.33 No.1
본 논문은 개발된 케미컬 앵커 기초 시스템(CAFS)의 인발 성능을 제시한다. CAFS의 내력을 조사하기 위하여 10개의 케미컬 앵커 실험체들에 대해 인발실험들이 수행되어졌다. 실험변수로서 케미컬 앵커의 직경과 매립깊이가 선택되어졌다. 추가적으로 콘크리트 기초의 내력이 CAFS의 내력과 비교하기 위하여 마찬가지로 조사되었다. 콘크리트 기초와 CAFS의 최대인발하중은 각각 3.5 kN과 5.6에서 47.1 kN까지 이었다. CAFS의 내력은 콘크리트 기초의 내력보다 적어도 1.7배 이었다. 실험결과로부터 CAFS가 콘크리트 기초보다 높은 인발내력을 가질 수 있음을 확인할 수 있었다. This paper presents pullout performance of chemical anchor foundation system (CAFS) which was invented in this study. In order to investigate the capacity of CAFS, pullout tests were performed 10 CAFS specimens. As test variable, diameter and embedment length of chemical anchor were selected. In addition, the capacity of concrete foundation was also investigated to compare with that of CAFS. The maximum pullout loads of concrete foundation and CAFS were a 32 kN and from 5.6 to 47.1 kN, respectively. The capacity of CAFS was at least 1.7 times of that of concrete foundation. From the test results, it should be mentioned that CAFS have higher pullout capacity than concrete foundation.\
조직이론의 관점에서 본 오피스 공간 계획유형에 관한 기초연구
홍기남(Hong Ki-nam),이승조(Lee Seung-jo),최왕돈(Choi Wang-don) 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2
This study aimed to understand changing of work organization on variation of social organization and research typological classification of office layout based on preceded understanding. Buildings result from social needs and accommodate a variety of functions-economic, social, political, religious and cultural. Therefore, We can explain historical development of the constructing a building we understand the society and studying. After The modem age, it select a three buildings that there is an historical value of office Layouts planning and comprehend that make use sampling type of office work structure, studies a felicitous Typological classification of office Layouts. They find the development direction of a hereafter office of the task organization out according to it. And we suggest that Typological classification of Office Layouts based on Organization Theories.
석분 슬러지를 시멘트 치환재료 활용한 콘크리트의 역학적 특성
홍기남 ( Ki Nam Hong ),이재호 ( Jea Ho Lee ),이재호 ( Jea Ho Lee ),한상훈 ( Sang Hoon Han ),박재규 ( Jae Kyu Park ) 충북대학교 건설기술연구소 2012 建設技術論文集 Vol.31 No.2
본 연구의 목적은 시멘트 석분슬러지를 사용하여 콘크리트의 역학적 특성을 파악하고 시멘트 치환재로서의 활용가능성을 평가했다. 이러한 목적을 달성하기 위해, 압축강도 시험, 휨강도 시험, 탄성계수 측정, 길이변화 측정을 석분치환율을 0%, 10%, 20%, 30%로 달리하여 130개의 시험체에 대해 수행하였다. 석분슬러지의 대체 비율은 공기량에 영향을 미치지만, 미소한 차이를 보였다. 또한, 치환율 10% 시험체의 압축강도, 압축강도, 탄성계수, 휨강도, 길이변화는 일반 시험체와 유시한 결과를 보였으나, 치환율 10% 이상의 시헙체는 일반 시험체보다 역학적 특성이 저하되는 것을 확인하였다. 본 연구의 결과 화강암 석분슬러지 치환율 10%미만의 경우에서는 기존 콘크리트와 동일한 설계 및 현장적용이 가능하다고 판단되며, 치환율 10%이상의 경우에 있어서도 배합설계시에 적당한 안전계수를 적용하면 설계 및 현장적용이 가능하다고 판단된다. Purposes of this study were to define mechanical properties of concrete using crushed stone sludge as the cement substitute and to evaluate the possibility of its application as the cement substitutes. In order to achieve these purposes, the compressive test, test flexural test, and length change test were performed for 130 specimens manufactured by varied substitute ratio such as 0 %, 10 %, 20 %, and 30 %. From the tests, results was drawn as following. The substitute ratio of crushed stone sludge did not have the effect on air content but have the effect on slump value. In addition, it was conformed that the compressive strength and modulus of elasticity of specimen with substitute ratio by 10 % were almost similar to normal specimen, but the compressive strength and modulus of elasticity of specimens with substitute ratio of crushed stone sludge, all specimens with stone sludge developed the flexural strength require by the Korea Concrete Institute code. Because shrinkage amount of concrete with crushed stone sludge increased with the increase of substitute ratio, the decreasing method of shrinkage during mixing design should be considered. From this study, it was proved that concrete with substitute ratio by 10% have the same mechanical properties with concrete without the crushed stone sludge and concrete with substitute ratio over 10% have the lower mechanical properties than normal concrete, therefore other alternative such as admixture input should be considered during the mixing design.
알칼리 활성 슬래그 콘크리트의 내구성: 콘크리트의 염소이온 확산
홍기남 ( Ki Nam Hong ),박재규 ( Jae Kyu Park ),정규산 ( Kyu San Jung ),한상훈 ( Sang Hun Han ),김재현 ( Jae Hyun Kim ) 한국안전학회(구 한국산업안전학회) 2015 한국안전학회지 Vol.30 No.4
The aim of the present study is to investigate some characteristics of concrete according to addition of blast furnace slag and alkali-activator dosages. Blast furnace slag was used at 30%, 50% replacement by weight of cement, and liquid sulfur having NaOH additives was chosen as the alkaline activator. In order to evaluate characteristics of blast furnace slag concrete with sulfur alkali activators, compressive strength test, total porosity, chloride ions diffusion coefficient test were performed. The early-compressive strength characteristics of blast furnace slag concrete using a sulufr-alkali activators was compared with those of reference concrete and added 30, 50% blast furnace slag concrete. Also, Blast furnace slag concrete using sulfur-alkali activators enhanced the total porosity, chloride ions diffusion coefficient than two standard concrete. Alkali-activated blast furnace slag concrete was related to total porosity, compressive strength and chloride ions diffusion coefficient each others. As a result, it should be noted that the sulfur-alkali activators can not only solve the demerit of blast furnace slag concrete but also offer the chloride resistance of blast furnace slag concrete using sulfur alkali activators to normal concrete.
홍기남 ( Ki Nam Hong ),박재규 ( Jae Kyu Park ) 한국안전학회(구 한국산업안전학회) 2012 한국안전학회지 Vol.27 No.6
In this study, ambient temperature curing artificial aggregate were developed by using crushed-stone sludge, In order to evaluate the mechanical properties, the artificial aggregate was tested on 7 items. Test results showed that the artificial aggregate mostly satisfied the basic requirements f normal aggregate. The concrete with the artificial aggregate made by weathered rock and granite sludge was tested on the compressive test and flexural test. From the test results, It is confirmed that the concrete with the granite artificial aggregate develope the higher compressive strength than the crushed rock aggregate and the concrete with artificial aggregate concrete have the lower elastic modulus and flexural strength than the concrete with crushed rock aggregate.