강재 원형기둥-상자형보 접합부의 다이아프램 설계법

김영필,황원섭,박문수,Kim, Young Pil,Hwang, Won Sup,Park, Moon Su 한국강구조학회 2006 韓國鋼構造學會 論文集 Vol.18 No.2

이 연구에서는 원형기둥-상자형보 접합부의 다이아프램 형상에 따른 거동특성과 다이아프램 설계방법에 관한 것이다. 강재 원형기둥-상자형보 접합부의 다이아프램은 상자형보 하부플랜지로부터 전달되는 집중력을 지지하게 되며, 보와 기둥의 강도 뿐만아니라 접합부의 거동에 큰 영향을 미치게 된다. 기존의 연구에서는 부정정 곡선보 모델로부터 유도된 다이아프램의 응력계산식이 제시되어 있으나, 설계식으로 활용되기에는 계산과정이 난해하고 유도과정이 비합리적이다. 또한 접합부 강도에 대한 다이 아프램의 역할을 고려하지 않음으로써 다이아프램의 합리적인 설계가 이루어 지지 못하고 있다. 따라서 이 연구에서는 접합부 다이아프램의 설계변수에 대한 비선형 유한요소 해석을 수행하여, 다이아프램의 형상에 따른 강도특성을 검토하였다. 또한 원형기둥-상자형보, 접합부 다이아프램의 이론식이 접합부의 실제 거동과 큰 차이를 나타냄을 확인하였고, 보와 기둥 및 다이아프램 강성을 고려한 강재 원형기둥 접합부 다이아프램의 설계방법을 제안하였다. This paper investigates the design equations and the strength behavior of the diaphragm for steel box beams and circular-column connections. The strength of the connection is decided by the strength of the diaphragm and the strength of the beam and the column, because the connection diaphragm supports the concentration forces from the box beam's lower flange. In previous researches, however, the calculation procedure of the diaphragm stress from the indeterminate curved-beam model is to complicated to apply in process of the equation. Moreover, no reasonable design has yet ben made because the diaphragm's effect on the strength of the connection has not ben considered. Therefore, through nonlinear FEM analysis of the connection diaphragm, this study examines the strength behavior of a connection with diaphragm details. In addition, a great difference is confirmed between the theoretical and analytic behaviors. Fi naly, considering the strength of the connection and the rigidity capacity of the diaphragm, the diaphragm design method is proposed.

영암읍성(靈巖邑城) 소고(小考)

김영필,Kim, Young-Pil 한국건축역사학회 2011 건축역사연구 Vol.20 No.5

This study examined the background and change of building Yeongam eupseong and characteristics and construction method of its spatial structure. The results of this study can be summarized as follows. First, Yeongam eupseong was built for the same purpose of national border defense against the invasion of Japanese army as other Eupseongs were built and it was found first in the literature in the era of King Munjong of Joseon Dynasty with the scale of three gates and 4,369 cheok of castle wall. Such a scale was continued and in particular, according to flat structure, road network and gate position shown in the map, the form and road system of Yeongam eupseong before the 19th century were mostly identical with the current ones. Second, castle wall was built over foundation by using talcum after leveling the foundation soil and castle wall can be divided into outer wall, filling part and inner wall from the section. Outer wall was constructed by inserting and layering pebbles with big irregular stone, filling part was made with talcum and riprap and inner wall with soil in several layers by keeping gradient. This building method showed common features in inserting and layering pebbles for outer wall, use of protruded base and section form compared to Jeollado Eupseong.

보길도(甫吉島) 윤선도(尹善道) 유적(遺蹟)에 관한 건축적(建築的) 고찰(考察)

김영필,Kim, Young-Pil 한국건축역사학회 2010 건축역사연구 Vol.19 No.1

This study is on Yun Seon Do's site located at Bogildo, Wando-gun, Jeonnam, compares the relics found through excavation to literature records and examines the character of relics and architectural features of the site. The results of this study are summarized as follows. First, bridge and pond including Goksudang and Seojae mentioned in related literatures were found around Goksudang. In the spatial composition, the area was divided into three using the stream from the valley and pond including buildings was built at each area. Each area was connected through Honggyo, Yueuigyo, and Ilsamgyo bridges and intentionally lengthened movement was considered as the space production technique to see the valley, and upper and lower pond. Second, 11 building relics, pond and fence were confirmed around Nakseojae. The transformative process of these relics could be divided into three periods. The 1st of these period was when Yun Seon Do lived there and Mumindang, pond and waterway were arranged as straight axis. Third, Dongcheonseoksil consisted of building relics (1) for preparing for and drinking tea and pavilion (building relics(2)) and pond, and these were static with nature and used as contemplative space for viewing.

통일신라시대(統一新羅時代) 건물지(建物址)에 적용(適用)된 척도(尺度)에 관한 고찰(考察)

김영필,박강철,Kim, Young-Pil,Park, Kang-Chul 한국건축역사학회 2008 건축역사연구 Vol.17 No.4

This study is examine the scales applied to buildings in the age of Unified Silla through construction sites excavated and its results are as follows; First, scales used in the age of Unified Silla were varied like Jucheok, Dangcheok and Hancheok, but it was generally accepted that Dangcheok was used in Yeongjocheok Since it was found that the scales applied to Dabotap at the Bulguksa temple and main building of the Gameunsa temple belonged to Goguryeo, Yeongjocheok scale used early in the age of Unified Silla was transitional and it was thought that Goguryeocheok and Dangcheok were used togethar. Second, according to actual rulers in Korea, china and Japan, the length of Dangcheok(ruler used in Chinese Tang era) mostly belonged to the extent of $29.25cm\;{\sim}\;30.5cm$(central value: 29,71cm). Third, plane features of main building of temple are assumed that it had five rooms in front compartment until the 7th century and then it was diversified to three, five and seven compartment. The size of compartment was same in the scale of front Eokan and Hyeopkan until late 7th century, but since then the dimension of Eokan tended to be wider than Hyeopkan. It was judged that the front Eokan used triple scales like 9, 12, 15, 18 cheok. Fourth, the length of residential structures was 17.5cheok${\sim}$36cheok and Bcheok was commonly used for front side of structure, The length of official structures was 8.4cheok${\sim}$36.3cheok which is similar to residential structures. However it has been confirmed that each of 9cheok, 12cheok, and 15cheok has been used for Eokan and Hyeopkan which gave presumption that triple scales was used for the measure.

실내용 전동휠체어 구동 시나리오에 따른 배터리 성능 비교 분석

김영필(Young-Pil Kim),함헌주(Hun-Ju Ham),홍성희(Sung-Hee Hong),고석철(Seok-Cheol Ko) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.2

Electric wheelchairs are known as devices for outdoor use as mobility aids that are used when people cannot walk or cannot use their own manual wheelchairs. However, in recent years, as the desire for improving the quality of life of the disabled and elderly people with poor mobility has been increasing, the development of indoor electric wheelchairs is required. In the case of the indoor electric wheelchair, the short-time driving is repeatedly performed, so it is necessary to analyze the performance change of the electric wheelchair battery. In this study, we confirmed the battery performance according to the motor driving for a long time and compared and analyzed the battery performance according to the short time driving repetition of the electric wheelchair. As a result, it was confirmed that the use time is shortened by 18.7% compared to continuous driving when the short-term driving repetition is performed.

이중철심 병렬연결형 초전도한류기의 자속경로에 따른 피크전류 제한특성

김영필(Young-Pil Kim),고석철(Seok-Cheol Ko) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1

본 논문에서 초기 고장전류의 크기에 따라 피크전류제한 기능을 갖도록 하나의 철심에 기존 1차 코일과 2차 코일이 병렬로 연결된 초전도 소자1과 추가적인 철심을 사용하여 3차 권선에 초전도 소자2가 연결된 이중철심 구조의 초전도한류기를 제안하였다. 사고 초기 피크전류를 분담하기 위한 두개의 초전도 소자의 최적의 동작전류에 대한 분석을 등가모델을 통해 자속경로를 해석하였다. 또한, 감극결선과 가극결선의 권선방향에 따른 피크전류제한 기능을 상호 비교분석하였다.

이중 철심을 활용한 두 개의 자기결합형 초전도한류기의 회복특성 해석

김영필(Young-Pil Kim),고석철(Seok-Choel Ko) 대한전기학회 2014 대한전기학회 학술대회 논문집 Vol.2014 No.11

실리콘 서브 마운틴 기반의 LED 패키지 재료평가 및 신뢰성 시험

김영필(Young-Pil Kim),고석철(Seok-Cheol Ko) 한국조명·전기설비학회 2015 조명·전기설비학회논문지 Vol.29 No.4

The light emitting diodes(LED) package of new structure is proposed to promote the reliability and lifespan by maximize heat dissipation occurred on the chip. We designed and fabricated the LED packages mixing the advantages of chip on board(COB) based on conventional metal printed circuit board(PCB) and the merits of Si sub-mount using base as a substrate. The proposed LED package samples were selected for the superior efficiency of the material through the sealant properties, chip characteristics, and phosphor properties evaluations. Reliability test was conducted the thermal shock test and flux rate according to the usage time at room temperature, high-temperature operation, high-temperature operation, high-temperature storage, low-temperature storage, high-temperature and high-humidity storage. Reliability test result, the average flux rate was maintained at 97.04% for each items. Thus, the Si sub-mount based LED package is expected to be applicable to high power down-light type LED light sources.

일본의 재ㆍ보궐선거와 한국에서의 시사점

김영필(Young-Pil Kim) 한국정당학회 2005 한국정당학회보 Vol.4 No.2

2005년 4월30일 실시된 국회의원 재선거의 결과는 한국의 정치지형에 커다란 변화를 예고한 선거였다. 본고에서는 한국과 국회의원 선거제도뿐만 아니라, 재ㆍ보궐제도 또한 유사한 일본의 국회의원 보궐선거 결과에 대한 분석을 통하여 한국의 재ㆍ보궐선거에 던져주는 시사점을 도출해내고자 한다. 2000년 10월 이후 23개 선거구에서 일본의 국회의원 보궐선거 결과를 입체적으로 분석한 결과 다음과 같은 특징을 발견하였다. 첫째, 일본에서는 국회의원 재ㆍ보궐선거가 모두 보궐선거였다는 사실인데, 이는 국회의원의 사망에 의하여 실시하는 보궐선거와 국회의원들의 부정과 비리관련 사직에 의하여 실시하는 보궐선거가 있었다. 선거법 위반 등에 의한 경우도 있었지만, 재판결과를 기다리지 않고 의원직을 사퇴함으로서 재선거가 아닌 보궐선거가 실시된 것이었다. 이는 벌금형을 적게 받아 국회의원직을 유지하려는 한국정치가들의 형태와는 다른 것이었다. 둘째, 보궐선거임에도 불구하고 평균40% 이상의 투표율을 유지함으로써 어느 정도 의미 있는 선거를 가능하게 하고 있다. 지난 4월 30일에 실시된 한국의 국회의원 재선거 투표율이 경북 영천선거구를 제외하고 모두 40% 이하였던 것을 감안하면, 한국의 재ㆍ보궐선거제도에 대한 포괄적인 개혁이 필요하다고 할 것이다. 셋째, 일본은 국회의원 보궐선거 신인들의 정치입문 통로로 이용되고 있는 사실이다. 이에 반해 한국의 국회의원 재ㆍ보궐선거는 중량급정치가들의 재기의 발판으로 이용되고 있는 것이 현실인데, 국회의원 재ㆍ보궐선거를 통하여 신인들에게 정치권의 문호를 개방하는 인재 발굴노력이 필요한 시점에 와 있다고 할 것이다. 넷째, 일본의 유권자들은 의원의 사직에 의하여 실시되는 보궐선거에 대해서는 보궐선거의 원인을 제공한 정당에 대하여 후보자와 연대하여 책임을 묻는 투표행동을 보이고 있다. 한국에서도 4월 30일 실시된 국회의원 재선거에서 이러한 투표행태가 일부 보이고 있는 것은 고무적인 현상이다. 국회의원 재ㆍ보궐선거가 정당과 정치가뿐만 아니라 유권자들에게도 유용한 정치행사가 될 수 있도록 정계 전반에 걸친 자정노력이 필요하다고 할 것이다. The result of the reelection of members of the National Assembly on 30th April, 2005 shows the possibility of a big change in the map of Korean politics. This paper explores the results of by-elections in Japan which are analogous not only to the general election system but also to the re/by-election system in Korea, which would present some suggestions for the re/by-election in Korea. By analyzing the results of by-elections in 23 constituencies in Japan from October of 2000 in various ways, several characteristics below could be argued. First, it can be pointed out that every re/by-elections in Japan has been byelections which were held because either of the Diet member's death or of the resignation caused by their injustice or unfairness. There also have been the violations of the election law. They, however, resigned before the judgment, which resulted in the by-elections not in the reelections. These cases in Japan are different from those in Korea where the politicians try to maintain there status with less monetary penalty. Secondly, over 40% of turnouts in almost every by-election in Japan are noteworthy since it guarantees the efficiency. Considering that the only one constituency, Gyeongbuk Yeongcheon, showed under 40% of turnouts at the reelection of 30th April, the general reformation should be carried out of the re/by-election system in Korea. Thirdly, by-elections in Japan have been the entrance to the politics for the new comers. In Korea, however, the re/by-election is the stepping stone for the medium standing politicians. Now we are facing the time that we should try to open the gate of political circles and unearth new comers through it. Lastly, in case of the by-election by resignation, Japanese voters charge the political parties and candidates with the responsibility and it is directly connected to the result of by-election. This attitude of voting can be also found in the result of 30th April reelection partly in Korea, which is very stimulating. The effort for the self-purification through out the general political circles is required to make the re/by-election useful not only for the politicians and parties but also for the voters.

일본시민사회의 동북아 비핵지대화 구상

김영필 ( Young Pil Kim ) 한양대학교 제3섹터연구소 2003 시민사회와 NGO Vol.1 No.1