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      • KCI등재

        인천대교 선박 충돌에너지 분석을 통한 선박의 통항안전 속력에 관한 연구

        이창현,이홍훈,김득봉,김철승,박성현,Lee, Chang-Hyun,Lee, Hong-Hoon,Kim, Deun-Bong,Kim, Chol-Seong,Park, Seong-Hyun 해양환경안전학회 2016 海洋環境安全學會誌 Vol.22 No.6

        인천대교는 인천국제공항과 송도국제도시를 연결하는 길이 13.38 km, 경간 800 m의 대형 교량으로 시간당 73.8(vessel/hour)척의 선박이 통항하고 있다. 본 연구에서는 인천대교 건설 시 설계되었던 인천대교 충돌방지공의 안전기준을 바탕으로 인천대교를 통항하는 선박의 중량에 따른 안전한 통항 속력을 제시하고자 한다. 연구방법은 AASHTO LRFD에서 제시한 선박 충돌에너지와, 선박 충돌 속도, 수리동적질량계수를 고려하여 통항 선박의 안전 속력을 제시하고자 한다. 인천대교의 충돌방지공은 10만DWT급 선박이 10노트로 통항 할 수 있도록 설계되었다. 본 연구에서는 대상선박(30만DWT급)의 선속조건 및 화물 상태의 비교 분석을 통하여 각각의 충돌에너지에 따른 제한 속력을 산정하는 방식으로 통항 선박의 안전 속력을 제시하였다. 또한 해당 수역의 조위에 따른 통항 선박의 안전 속력을 추가적으로 분석하였다. 대상선박(30만DWT급)을 통한 연구 결과 최대 15만DWT급 선박이 평균조위 이상의 수심에서 최대 7노트 속력으로 운항이 가능한 것으로 나타났으며, 경하상태(Ballast condition)에서는 최대 8노트의 속력으로 인천대교를 통항할 수 있는 것으로 분석되었다. Incheon Bridge is 13.38 km long with an 800 m span, connecting Incheon International Airport and Songdo International City, Per hour 73.8 vessels navigate this space. The purpose of this study was to suggest a safe passing speed based on the displacement of a vessel based on the safety criteria of Incheon Bridge's anti-collision fence, which was designed during its initial construction. As AASHTO LRFD suggested, vessel collision energy, vessel collision velocity, and the hydrodynamic mass coefficient were considered to derive a safe vessel traffic speed. Incheon Bridge's anti-collision fence was designed so that 100,000 DWT vessels can navigate at a speed of 10 knot. This research suggests a safe speed for vessel traffic through a comparative analysis of an experimental ship's (300,000 DWT) speed and cargo conditions, regulation speed has been calculated according to the collision energy under each set of conditions. Additionally, safe traffic vessel's safe speed was analyzed with reference to tidal levels. Results from the experimental ship showed that a vessel of maximum 150,000 DWT is able to pass Incheon Bridge at a maximum of 7 knots with an above average water level, and is able to pass the bridge with a maximum of 8 knots under ballast conditions.

      • KCI등재

        마그네트론 스퍼터링 증착법을 사용하여 순수한 질소 플라즈마에 의해 성막된 고경도 TiN<sub>X</sub> 박막의 역학적 특성

        이창현,이병로,배강,박창환,김화민,Lee, Chang-Hyun,Rhee, Byung-Roh,Bae, Kang,Park, Chang-Hwan,Kim, Hwa-Min 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.8

        TiN (titanium nitride) films were prepared using the RF magnetron sputtering technique. The films were deposited by pure $N_2$ plasma sputtering. Their mechanical properties, such as nano-indentation hardness, friction coefficient, and surface wettability, have been investigated. X-ray diffraction (XRD) studies revealed that the orientation of $TiN_X$ films changed towards the (111) orientation with decreasing working pressure due to a strong compressive stress during deposition. The strongest TiN (111) orientation was found when the film was deposited at a working pressure of 1 Pa. This film showed the largest hardness (16 GPa) and smallest friction coefficient (0.17) among the studied samples. Moreover, this film was found to be accompanied by a water-repellent surface with water contact angle more than $100^{\circ}$.

      • KCI등재후보

        嶺東地方 三國時代 住居址 試論

        李昌鉉(Lee Chang Hyun),辛裕梨(Shin Yu Ri) 한국문화사학회 2010 文化史學 Vol.0 No.33

        삼국시대 영동지방에 대한 연구는 부족한 문헌사료로 인하여 주목받지 못하다가 근래들어 활발한 고고학적 성과로 인하여 새로이 관심을 갖게 되었다. 즉 신라고분의 조사와 함께 고분 자체의 형식학적 편년을 바탕으로 신라세력의 강릉지역 진출 등에 관한 연구가 시도되었다. 그러나 삼국시대 이전의 고고학적 성과가 대부분 주거유적을 중심으로 이뤄지고 있는 상황이므로, 이러한 단절적인 고고학적 성과는 삼국시대로의 계기적인 발전 및 전개상황을 설명하는 데에 한계가 되었다. 다행이 최근 들어 점차 삼국시대 주거지에 대한 고고학적 성과가 이뤄지고 있으므로 이러한 성과를 바탕으로 시론적 고찰을 시도하게 되었다. 현재까지 영동지방 삼국시대 주거지는 주로 강릉지역을 중심으로 확인되고 있는데, 입지에 있어서는 대부분이 해안가 사구지대에 위치하는 특징을 보인다. 평면 형태는 이전 시기인 철기시대(원삼국시대)의 주거지가 대부분 凸자 또는 呂자형인 반면, 방형 및 장방형으로의 변화가 간취된다. 규모에 있어서도 중ㆍ대형의 주거지에서 점차 소형화되는 경향을 보인다. 내부시설로는 출입시설, 바닥시설, 노시설, 저장시설, 주혈 등이 있는데, 이중 가장 큰 변화를 반영하는 것은 노시설이다. 철기시대(원삼국시대)의 점토띠식노지 등은 소멸되고, 아궁이식, 부뚜막식, 터널식 노시설이 등장하면서 보편화된다. 이러한 특징을 지닌 영동지방 삼국시대 주거지는 크게 1~4단계의 발전과정을 거친다. 1단계는 土師器 및 고식도질토기 단계에 해당하는 컵형 토기를 근거로 4세기 중반경에 설정할 수 있으며, 2단계는 고배, 고식의 장경호 등으로 5세기 전반경에 해당하며, 적갈색연질토기의 타날기법에 있어 격자타날에 평행타날이 추가로 나타난다. 3단계는 5세기 후반경으로 적갈색연질토기의 타날방법에 있어 격자타날이 거의 사라지고 승문ㆍ평행타날로 대체되며, 유구에 있어서는 부뚜막 시설이 대세를 이루고 있다. 4단계는 盒의 전면에 침선문이 돌려져 있는 것을 특징으로 6세기 전반경으로 설정 가능하다. Studies on Yeongdong district during the Period of the Three Kingdoms had not attracted attention because of insufficient literature, however, these days it came to be newly observed due to active archeological accomplishments. That is, studies on the Silla Dynasty' s advance to Gangneung area were attempted recently on the basis of researches into ancient tombs of the Silla Dynasty and chronological arrangement by shapes of the tombs. However, this discontinuous archeological accomplishments were not enough to explain development to the Period of the Three Kingdoms because most archeological accomplishments before the Period of the Three Kingdoms mainly focuses on residential sites. Fortunately, archeological accomplishments about residential areas during the Period of the Three Kingdoms have been made recently, therefore, this tentative study was possible on the basis of those accomplishments. Up to now, residential areas in Yeongdong district during the Period of the Three Kingdoms have been found around Gangneung area, mostly, in costal sandhills. It was found that plane patterns were square or rectangle while residential areas of the Iron Age/the Proto-Three Kingdoms Period) were mostly 凸 or 呂 patterns. Also size became smaller gradually from medium and large scale. Inside facilities include an entrance, floors, a fire facility, a storage, traces of poles, etc. and among them, fire facility presents the greatest changes. Belt-type clay fireplaces of the Iron Age disappeared, and fuel holes, cooking fireplaces and tunnel style fire facility became common. Residential areas of Yeongdong district during the Period of the Three Kingdoms went through four developmental steps. Step 1 is the middle of the 4th century including cup-style earthen ware including Tosagi(土師器) and traditional style earthen ware(古式陶質土器); Step 2 is the former part of the 5th century including Gobae(高杯) and traditional style Janggyeongho(長頸壺), and also parallel patting was introduced in addition to lattice patting when making reddish brown soft ware(赤葛色軟質土器); Step 3 is the latter part of the 5th century in which lattice patting of reddish brown soft ware(赤葛色軟質土器) nearly disappeared while being replaced with twisted or parallel patting, and cooking fireplace became the general tendency. Step 4 is the former part of th 6th century and its characteristic is traditional clothe sewing pattern placed around a bowl.

      • KCI등재

        초광역경제권(MegaloPolis)으로 본 한국-일본간 경제협력에 관한 연구 -부산-후쿠오카현 초광역경제권 형성을 중심으로-

        이창현 ( Chang Hyun Lee ),김경희 ( Kyoung Hee Kim ) 한국통상정보학회 2009 통상정보연구 Vol.11 No.1

        I wish to examine plan about megalopolis formation with Japan and Busan, possess location condition that can be injured to center hub of North-east Asia. First for this, through competitive analysis of Korea and Japan in industrial structure, I will search competition relation. Second, examine what exports and specialization industry of two area are, through industrial structure of Busan and Kyushu area of Japan. Third, to form megalopolis, wish to present what business belt that can bind two area. Fourth, I wish to present preview point about this study in the conclusion. Examine from 2004 to 2007 through exports, degree of trade join(combination), index of trade specialization degree, index of Revealed comparative advantage, and etc, for analysis of this study how in changed industry competitive between two countries or two area have changed.

      • 운동에너지 탄에 따른 전투시스템 내의 순간화재발생에 대한 해석적 연구

        이승철(Lee Seung-Chul),전우철(Jeon Woo-Chul),이해평(Lee Hae-Pyeong),이헌주(Lee Heon-Joo),이창현(Lee Chang-Hyun) 제어로봇시스템학회 2012 제어로봇시스템학회 합동학술대회 논문집 Vol.2012 No.7

        본 연구는 외부 위협탄에 의한 전투시스템의 취약성을 분석하기 위한 선행연구로써, 운동에너지 탄의 종류에 따른 가상의 전투차량 내부에 적재포탄에서 순간화재발생 여부에 대한 전산해석을 수행하였다. 본 해석은 Autodyn 프로그램을 사용하였으며 순간화재발생을 판단하기 위해 Lee-Tarver ignition and growth model을 이용하였다. 본 계산에서 운동에너지 탄은 type A와 type B 두 가지로 설정하였고, 고폭탄은 COMPB, TNT 및 PBX9404를 설정하였다. 전산해석 결과, 고폭탄의 재질이 TNT와 PBX9404가 COMPB 재질보다 순간화재발생 확률이 상당히 높음을 알 수 있고 type B의 운동에너지 탄이 type A 보다 순간화재발생 확률이 다소 높음을 알 수 있었다.

      • KCI등재

        플라즈마 에칭공정에 따른 산화물 박막의 광촉매 표면 특성

        이창현,서성보,오지용,진익현,손선영,김화민,Lee, Chang-Hyun,Seo, Sung-Bo,Oh, Ji-Yong,Jin, Ik-Hyeon,Sohn, Sun-Young,Kim, Hwa-Min 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.5

        $WO_3$, $SiO_2$, and $TiO_2$ films with hydrophilic property are deposited by rf-magnetron sputtering. Their wettability is strongly depends on the presence or absence of the oxygen plasma etching on the glass substrates. The $TiO_2$ film of 50 nm-thick on the plasma etched glass shows a water contact angle (WCA) below $5^{\circ}$ which means a super-hydrophilic surface. However, WCA values are gradually degraded when the films are exposed under atmosphere, especially $WO_3$. In order to improve hydrophilic property, the degraded films can be again recovered by UV illumination for 10 sec using UV-light and the $TiO_2$ film shows a super-hydrophilic surface about $3^{\circ}$.

      • KCI등재

        Pseudorabies virus를 이용한 신장, 신수 및 경문에서 투사되는 중추신경계내 표지영역에 관한 연구

        이창현,이시섭,육태한,Lee, Chang-Hyun,Lee, Si-Sup,Yook, Tae-Han 대한침구의학회 2001 대한침구의학회지 Vol.18 No.3

        Objective : To investigate the relation to the organs, shu points and mu points. The labeled common locations of the spinal cord and brain were observed following injection of pseudorabies virus(PRV) into the the kidney, UB23 and GB25. Methods : After survival times of 96 hours following injection of PRV, The fifteen rats were perfused, and their spinal cord and brain were frozen sectioned($30{\mu}m$). These sections were stained by PRV immunohistochemical staining method, and observed with light microscope. Results : In spinal cord, PRV labeled neurons projecting to the kidney, BL23 and GB25 were founded in cervical, thoracic, lumbar and sacral spinal segments. Dense labeled areas of cervical segments were overlap in lateral cervical n. and lamina III-V area. Thoracic segments were overlap in lateral spinal n., intermediolateral n. and lamina V-X areas. Lumbar segments were overlap in lamina I-V areas. Sacral segments were overlap in lamina IV, V and X areas. In brain, PRV labeled areas projecting to the kidney, UB23 and GB25 were overlap in the A1 noradrenalin cells/C1 adrenalin cells/caudoventrolateral reticular n./rostroventrolaterai n., raphe obscurus n,, raphe pallidus n., raphe magnus n., gigantocellular reticular n., locus coeruleus, subcoeruleus n., A5 cell group and paraventricular hypothalamic n.. Conclusions : This results suggest that PRV labeled overlap areas of projecting to the kidney may be correlated to shu and mu points related to the kidney. These morphological results provide that organs-shu(transport) and mu(alarm) points interrelationship may be related to the central autonomic pathways.

      • KCI등재

        치매와 관련된 뇌영역에 투사되는 경혈(외관(SJ5), 내관(Pe6), 삼음교(SP6) 및 현종(GB39))의 탐색에 관한 신경해부학적 연구

        이창현,김태헌,이상룡,육태한,Lee, Chang-hyun,Kim, Tae-heon,Lee, Sang-ryong,Yook, Tae-han 대한침구의학회 2003 대한침구의학회지 Vol.20 No.6

        Objective: The neuroanatomical studies on the acupoints(Waiguan(SJ5), Neiguan(Pe6), Sanyinjiao(SP6) and Xuanzhong(GB39)) projecting to the brain area related to dimentia using the pseudorabies virus (PRV-Ba strain) in the mouse was described. Methods: The common locations of the brain projecting to the Waiguan, Neiguan, Sanyinjiao and Xuanzhong following injection of PRV-Ba were histochemically observed. The results were as follows Results : 1. PRV-Ba labeled areas in medulla oblongata, pons and midbrain were similar to 4 acupoints, theses areas were related to autonomic center. 2. PRV-Ba labeled areas in diencephalon and cebrebrum were differently labeled according to the acupoints. 3. CNS labeled areas in Waiguan were dense labeled in CA1-3 area of hippocampus, amygdaloid nucleus, insular cortex, parietal cortex, entorhinal cortex, perirhinal cortex, dorsal endopiriform cortex, piriform cortex, amygdalopiriform transition and bed n. of stria terminalis. 4. CNS labeled areas in Neiguan were dense labeled in insular cortex, amygdaloid nucleus, parietal cortex, entorhinal cortex, perirhinal cortex, dorsal endopiriform cortex, piriform cortex, amygdalopiriform transition and bed n. of stria terminalis. 5. CNS labeled areas in Sanyinjiao were dense labeled in CA1-3 of hippocampus, suprachiasmatic n., dorsal endopiriform cortex, piriform cortex and bed n. of stria terminalis. 6. CNS labeled areas in Xuanzhong were dense labeled in suprachiasmatic n., dorsal endopiriform cortex and piriform cortex. Conclusions : Following these results, labeled acupoints in brain areas related to dimentia are Waiguan and Neiguan. Common labeled areas are amygdaloid n., entorhinal cortex, amygdaopiriform transition, bed n. stria terminalis and perirhinal cortex.

      • KCI등재

        Hydrate Salt법을 이용한 Nano BaTiO<sub>3</sub> 저온합성 메커니즘

        이창현,신효순,여동훈,하국현,남산,Lee, Chang-Hyun,Shin, Hyo-Soon,Yeo, Dong-Hun,Ha, Gook-Hyun,Nahm, Sahn 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.12

        $BaTiO_3$ nano powder can be synthesized by hydrate salt method at $120^{\circ}C$ in air. Decreasing the thickness of thick film, the nano dielectric particle is needed in electronic ceramics. However, the synthesis of $BaTiO_3$ nano particle at low temperature in air and their mechanism were not reported enough. And ultrasonic treatment can be tried because of low temperature process in air. Therefore, in this study, the $BaTiO_3$ nano powder was synthesised with the synthesis time and ultrasonic treatment at $120^{\circ}C$ in air. In the synthesis process, the effects of process were evaluated. From the experimental observation, the synthesis mechanism was proposed. The homogeneous $BaTiO_3$ particle was synthesised by KOH salt solution at $120^{\circ}C$ for 1hour. It was conformed that the ultrasonic treatment effected on the increase of synthesis rate. After cutting the salt powder using FIB, $BaTiO_3$ nano particles observed homogeneously in the cross-section of the salt particle.

      • KCI등재

        A Study on the Introduction Plan of the Places of Refuge in Domestic Areas based on the Analysis of Foreign Cases

        이창현,박성현,정중식,Lee, Chang-Hyun,Park, Sung-Hyeon,Jeong, Jung-Sik The Korean Society of Marine Environment and safet 2012 海洋環境安全學會誌 Vol.18 No.3

        해상에서 발생하는 대형 해양사고는 재산상의 손실뿐만 아니라 심각한 해양환경 오염피해를 유발하고 있다. 국제해사기구(IMO)에서는 해양사고 발생으로 인한 2차적인 해양환경오염 피해를 최소화하기 위하여 "원조를 필요로 하는 선박"에 선박 피난처를 제공하도록 결의서 Res. A.949(23)로 채택하였다. 해상교통 환경 요소 등에 의한 데이터를 바탕으로 종합적인 측면에서 잠재적 위험평가를 실시하여 위험도의 레벨이 일정한 크기를 초과하게 되면 피난처로 지정될 필요가 있고, 선박의 통항안전성, 혼잡도 및 위험도의 정량화/표준화된 기술을 기반으로 선박 피난처 지정 시스템 기술개발이 시급하다. 또한, 선박 피난처를 지정하는 문제는 연안국의 자연환경을 보호하기 위한 국가 정책과 밀접한 관련이 있기 때문에 관련 법안을 마련하는 것이 최우선이다. 본 연구에서는 선박 피난처를 지정 운영하고 있는 외국 사례 분석을 통해 효율적인 국내 선박 피난처 도입방안을 마련하고자 하였다. A huge marine accident causes a loss of valuable lives, property and the serious marine environment pollution. IMO adopted resolution A.949(23) to provide Places of Refuge(PoR) to 'Ship in need of assistance', which is to minimize the secondary environmental pollution caused by marine accidents. If the level of risk exceeds a certain range, it is necessary to be designated as Places of Refuge(PoR) after evaluation of potential risk, which is based on the database of several marine environmental factors. Also, it is necessary to develop skills about quantification/standardization of vessel traffic safety, complexity and risk. Because there is the close relation between the problem of designating Places of Refuge(PoR) and the policy of nation for protecting the natural environment of coastal state, it is important to prepare related legislation. In this paper, introduction of Places of Refuge(PoR) in domestic areas have been suggested based on the analysis of several foreign designating cases.

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