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최정훈(Jung-Hun Choi),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok),송원근(Weon-Keyu Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In case of large steel water pipe, it have been observed that its fracture mostly occurs due to the complicated outside fatigue load on the pipe in the underground. It is also well known that its damage and leakage happen mainly in a weld zone. In this study we evaluated the fatigue characteristics based on size effect and residual stress by comparing the test results on the standard specimen collected from real pipe with those on full scale pipe.
중국 강남 수향진의 수변공간 특성 연구 - 절강성 오진과 남심을 사례로 -
최정권 ( Choi Jung-kwon ),최정민 ( Choi Jung-mean ) 한국전통조경학회(구 한국정원학회) 2016 한국전통조경학회지 Vol.34 No.4
본 연구는 물과 밀접한 관계를 맺으며 형성되고 발전해 온 중국 강남 수향진 외부공간의 특성을 분석하고 정리하고자 하는 것이 목적이다. 중국 절강성에 위치한 수향진인 오진과 남심을 대상으로 한 연구의 결과로서 수변공간의 구조적 특징은 다음과 같다. 첫째, 수향진의 입지와 도시적 골격, 필지 구획과 건축은 수로에 의해서 결정된다. 수로는 십자형(十字形) 또는 정자형(丁字形)과 이들의 조합으로 구성되고, 수로의 교차점과 중심 수로변은 규모와 세력이 큰 상업지가 형성되어 고밀화된다. 둘째, 중심 수로변으로 공적 공간이 형성되고, 이와 시각적, 기능적으로 교호하는 사적인 건축물들이 수로변에 자리 잡아 강남 수향 특유의 경관을 창출하고 있다. 셋째, 주거지는 남향 배치가 유리한 동서 방향의 수로변으로 형성되고, 수변 주택은 중정을 가진 내향적인 공간 구조이지만, 외부공간은 수로공간과 긴밀성을 높여 공간적으로 조화되는 수변 경관을 형성하고 있다. 넷째, 수변공간을 형성하는 다양한 요소들이 공간 환경을 풍부하게 한다. 즉, 수로와 함께 수변로, 낭붕, 기루, 다관, 하부, 광장, 교량, 희대, 수문과 탑 같은 외부공간 요소는 수향진의 커뮤니티를 형성하고 정체성을 부각하는데 매우 중요한 요소이다. 현대도시에서 장소의 고유성과 질이 핵심경쟁력이 되고 있다. 이런 측면에서 역사적, 문화적 집적도가 높은 강남 수향은 의미 있는 시사점을 제공하고 있다. 주요 시사점은 다음과 같다. 첫째, 물과의 긴밀성 증진은 수변공간 계획이 지향해야 할 가장 기본적인 가치이다. 둘째, 용도 복합은 공간의 효율적 이용과 장소 활성화를 위한 필수적이다. 셋째, 지역의 고유성을 장소 자산으로 하는 수변 계획이 요구된다. The purpose of this study is to identify characteristics of spatial structure of Jiangnan water town in China which has been developed along the water channel. Spatial structural characteristics of the water town, Wuzhen and Nanxun in Zhejiang Province are as follows. First, location of town, spatial framework, lot division, and architectural style get determined by the water channel. The water channel is constructed in cross shape, T-shape, or in combination. Secondly, public space of water town is established along main water channel. Visually and functionally alternating private buildings are established on the water channel side and they are creating unique landscape of Jiangnan water town in overall harmony. Thirdly, residential area is established on the east-west water channel side with southward sunny-faced arrangement and waterside residence is in introvert spatial structure with courtyard but the exterior space is connected with water channel intimately. Fourthly, various spatial components along the water channel enrich the sense of place in water town. The components are corridor with roof, tea house, waterside steps, waterside theater and watergate etc. Uniqueness of place is becoming the core competence in modern townscape. In this aspect, Jiangnan water town with historical and cultural accumulation is suggesting a significant implication. Major implications are as follows. First, promotion of proximity to the water is the basic value that the spatial plan of waterfront needs to pursue. Secondly, mixed use is essential for effective land use and revitalization of waterfront. Thirdly, waterfront plan based on the local uniqueness as the place asset is being required.
Ryu, Ha-Jung,Jung, Ho-Youl,Park, Jung-Sun,Ryu, Gil-Mi,Heo, Jee Yeon,Kim, Jae-Jung,Moon, Song-Mean,Kim, Hung-Tae,Lee, Jong-Young,Koh, Insong,Kim, Jun-Woo,Rho, Jae Kyun,Han, Bok-Ghee,Kim, Hyungtae,Park, S.Karger 2006 International archives of allergy and immunology Vol.139 No.3
<P><I>Background and Methods:</I> Numerous genetic studies have mapped asthma susceptibility genes to a region on chromosome 5q31-33 in several populations. This region contains a cluster of cytokines and other immune-related genes important in immune response. In the present study, to determine the genetic variations and patterns of linkage disequilibrium (LD), we resequenced all the exons and promoter regions of the 29 asthma candidate genes in the chromosome 5q31-33 region. <I>Results:</I> We identified a total of 314 genetic variants, including 289 single nucleotide polymorphisms (SNPs), 22 insertion/deletion polymorphisms and 3 microsatellites. Standardized variance data for allele frequency revealed substantial differences in SNP allele frequencies among different ethnic groups. Interestingly, significant ethnic differences were observed mainly in intron SNPs. LD block analysis using 174 common SNPs with a frequency of >10% disclosed strong LD within most candidate genes. No significant LD was observed across genes, except for one LD block (CD14-IK block). Gene-based haplotype analyses showed that 1-5 haplotype-tagging SNPs may be used to define the six or fewer common haplotypes with a frequency of >5%, regardless of the number of SNPs. <I>Conclusion:</I> Overall, our results provide useful information for the identification of immune-mediated disease genes in the chromosome 5q31-33 region, as well as valuable evidence for gene-based haplotype analysis in disease association studies.</P><P>Copyright © 2006 S. Karger AG, Basel</P>
충격손상을 받은 항공기용 복합재료의 잔류강도 변화에 따른 피로수명 특성 평가
최정훈(Jung Hun Choi),강민성(Min Sung Kang),박홍선(Hong Sun Park),구재민(Jae Mean Koo),석창성(Chang Sung Seok) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
섬유강화 복합재료는 비강도, 비강성 등의 우수한 기계적 성질로 인하여 경량화가 요구되는 항공우주분야를 중심으로 그 사용이 급격하게 증가되고 있다. 그러나 이러한 분야에 사용되는 복합재료는 두께방향의 강도가 부족한 구조적 특성 때문에 외부 물체의 충돌로 인한 충격에 의한 영향이 크며 또한 이러한 손상이 발생한 상태에서 계속되는 운항에 의하여 피로하중을 받게 된다. 충격손상을 받은 복합재료에 피로하중이 작용할 경우 잔류강도의 저하에 따라 피로수명은 현저히 감소되지만 피로수명에 미치는 충격손상의 영향과, 이를 고려한 피로수명 예측모델은 그 중요성에도 불구하고 명확하게 제시되지 못하고 있는 실정이다 따라서 본 연구에서는 충격손상을 받은 복합재료의 피로수명을 평가할 수 있는 기존의 수명예측 모델을 검토한 후, 잔류강도변화에 따른 피로수명의 변화를 검토하고자 한다. As fiber strengthening composite material makes aerospace field that light finishing material by excellent mechanical properties of strength to weight ratio, nasal cavity gender etc.. is required the center, the use is increased sharply. But, because of structural special quality that composite material that is used in these field lacks strength of thickness direction, when damage that effect by impact by collision of outside object is big and also is such happens, receive fatigue load by continued service. In case of fatigue load interacts to composite material that receive impact damage, fatigue life is reduced remarkably according to decline of retained strength, but it is real condition that fatigue life estimate model who consider effect of impact damage and this getting in fatigue life is not presented definitely in spite of the importance. Therefore, in this research, 1 wish to verify through fatigue test after examine fatigue life estimate model who can estimate given amplitude load trousers fatigue life to composite material that receive impact damage. Also, I wish to examine change of fatigue life by change of retained strength after impact.
조민재 ( Mean Jea Jho ),쑤양싸이양 ( Saiyang Xouyang ),이진수 ( Jin Su Lee ),안다현 ( Da Hyun Ahn ),정치섭 ( Chi Sup Jung ) 한국센서학회 2019 센서학회지 Vol.28 No.1
A copper tetracumylphenoxy phthalocyanine (CuPccp) thin film was formed on an organic insulator film by Langmuir- Blodgett (LB) deposition for gas sensor fabrication. To increase the reproducibility of film transfer, stearyl alcohol was used as a transfer promoter. The structural properties of the CuPccp layers were optically monitored through attenuated total reflection and polarization-modulated ellipsometry techniques. The average thickness of a single layer of the CuPccp LB film was measured to be 2.5 nm. Despite the role of the transfer promoter, the stability of the layer transfer was not sufficient to ensure homogeneity of the LB film. This was probably due to the presence of aggregates in the molecular structure of the CuPccp LB film. Nevertheless, copper phthalocyanine polymorphism can be greatly suppressed by the LB arrangement, which appears to contribute to the improvement of electrical conductivity. The p-type semiconductor characteristics were confirmed by Hall measurements from the CuPccp LB films.
확률밀도함수를 이용한 상수도 실 배관의 피로수명 특성 평가
최정훈(Jung-Hun Choi),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok),송원근(Weon-Keyu Song) 대한기계학회 2008 大韓機械學會論文集A Vol.32 No.9
The fatigue characteristics of a material or a structure are generally derived from fatigue tests of standard specimens. However, test results of standard specimens are different from those of real structures or components. Therefore, to calculate more accurate fatigue life, the geometrical effect and surface condition must be considered by comparing test results of standard specimens with those of real structures or components. Thus the object of this paper is to evaluate the fatigue characteristics of a real waterwork pipe. Also, to evaluate fatigue characteristic based on life distribution, the statistical fatigue characteristics were analyzed by the normal distribution and related data of P-S-N curve.
평직 CFRP 복합재료의 파손강도 및 파괴저항성 특성 평가
최정훈(Jung-Hun Choi),이우형(Woo-Hyung Lee),박홍선(Hong-Sun Park),강민성(Min-Sung Kang),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
The mechanics of woven fabric-based laminated composites is complex. Then, many researchers have studied woven fabric CFRP materials but fracture resistance behaviors for composites have not been still standardized. Also, it shows the different behavior according to load and fiber direction. Therefore, there is a need to consider fracture resistance behavior in conformity with load, fiber direction at designing structure using woven CFRP materials. In this study, therefore, the fracture strength and resistance for plain-weave CFRP composite materials was investigated under various different angle condition(load to fiber angle: 0°, 15°, 30°, 45°). All of tests of fracture strength and resistance were carried out under mode I transverse crack opening load by using compact tension specimens.
수정된 하중비법을 이용한 배관 시험편의 균열 길이 계산
최정훈(Jung-Hun Choi),구재민(Jae-Mean Koo),석창성(Chang-Sung Seok),허용(Yong Huh),박재실(Jae-Sil Park) 대한기계학회 2009 大韓機械學會論文集A Vol.33 No.12
The objective of this paper is to apply the load ratio method to the measurement of the crack length of the real scale pipe specimen. The load ratio method was modified and finite element analyses were performed to derive the relationship between the normalized compliance and the normalized crack length for the pipe specimen. In order to measure the crack length, the direct current potential drop method and the modified load ratio method were applied to the pipe test. The applicability of the modified load ratio method was confirmed by comparing the calculated crack length with the measured crack length from the pipe experiment.