Macrobenthos Community in Keum-Mankyung-Dongjin Estuaries and its Adjacent Coastal Region, Korea

최진우,고철환,CHOI, JIN-WOO,KOH, CHUL-HWAN The Korean Society of Oceanography 1994 韓國海洋學會誌 Vol.29 No.3

Macrobenthic fauna in three Keum-Mankyung-Dongjin Estuaries and their nieghbouring coastal region in the west coast of Korea were sampled as 39 stations with van Veen grab to describe the distribution patterns of macrobenthos. Total 61 taxa from 10 faunal taxonomic groups and 5,636 individuals were collected. Abundance, species number, and faunal composition varied among three estuaries and coastal region. Dominant species from estuaries were similar to each other, but different from those of coastal region. Dominant species in estuarine regions were Prionospio cirrifera, potamocorbula amurensis. Nephtys californiensis, Glycera chiron and Glycinde sp, those from coastal area were Mactra chinensis. Magelona japonica, Owenia fusiformis. Anaitides Korean and Nephtys polybranchia. Two most dominant species in estuaries, Potamocorbula amanuensis and Prionospio cirrifer were not found elsewhere in Korean waters. The patchy distribution of dominant species and low species richness were reflected in the low species diversity Filter feeders were a major component in estuaries. High proportion of carnivores and low percentage of subsurface deposit feeders seemed to be a typical trophic composition in the study area. the distribution pattern of macrobenthos was related with the salinity and sediment types.

복합신소재를 사용한 송전탑

최진우,윤순종,Choi, Jin-Woo,Yoon, Soon-Jong 한국복합신소재구조학회 2011 복합신소재학회논문집 Vol.2 No.4

복합신소재를 이용한 교량

최진우,윤순종,Choi, Jin-Woo,Yoon, Soon-Jeong 한국복합신소재구조학회 2010 복합신소재학회논문집 Vol.1 No.4

수상 부유식 태양광발전 구조물의 구조적 성능 평가

최진우,서수홍,주형중,윤순종,Choi, Jin Woo,Seo, Su Hong,Joo, Hyung Joong,Yoon, Soon Jong 대한토목학회 2014 대한토목학회논문집 Vol.34 No.5

최근 화석연료의 과도한 소비로 인해 다양한 환경문제가 발생하고 있으며, 이에 대한 대안으로 신재생에너지의 중요성과 그에 대한 시설의 수요가 꾸준히 증가하고 있다. 이러한 수요를 만족하기 위하여, 다수의 태양광발전 구조물들이 건설, 계획되고 있다. 그러나 대부분의 태양광발전 시설들은 육지에 시공되고 있기 때문에 토지 이용에 따른 건설비의 증가와 토지 개간에 의한 추가적인 환경문제 등이 발생하고 있다. 이러한 문제점을 해결하기 위하여 최근 국내에서는 FRP를 활용한 수상 부유식 태양광발전 구조물에 대한 연구를 지속적으로 수행하고 있다. FRP는 높은 강도와 내부식성 및 작은 단위중량 등의 장점을 가지고 있기 때문에 최근 토목분야에서 각광받고 있으며, 이러한 재료적 특성은 자중에 따라 부력체의 크기가 결정되는 수상 구조물에 특히 유용하다. 이 연구에서는 수상 부유식 태양광발전 구조물과 구조물을 구성하는 SMC FRP 수직재의 구조적 성능을 평가하기 위한 해석적, 실험적 연구를 수행하였다. 수상 부유식 태양광발전 구조물은 유한요소해석을 통해 정적거동을 평가하고, 실험을 통해 동적거동을 평가하였다. 또한 SMC FRP 수직재는 유한요소해석을 통해 구조안전성 및 좌굴안정성을 평가하였으며, 실험을 통해 압축 및 인발 하중에 대한 구조적 거동 특성을 검토하였다. 검토 결과 펄트루젼 FRP (pultruded FRP)와 SMC (Sheet Modoling Compound) FRP로 구성된 구조시스템은 외부하중에 대한 안전성을 확보하고 있음을 확인하였다. In recent years, numerous environmental problems associated with the excessive use of fossil fuel are taking place. For an alternative energy resource, the importance of renewable energy and the demands of facilities to generate renewable energy are continuously rising. To satisfy such demands, a large number of photovoltaic energy generation structures are constructed and planned with large scale. However, because these facility zones are mostly constructed on land, some troubles are occurred such as rising of construction cost due to the cost of land use, environmental devastation, etc. To solve such problems, the floating type photovoltaic energy generation system using FRP members have been developed in Korea. FRP members are recently available in civil engineering applications due to many advantages such as high strength, corrosion resistance, light weight, etc. and they are suitable to fabricate the floating structures because of their material properties. In this study, the analytical and experimental investigations to evaluate the structural performance of floating PV generation structure and SMC FRP vertical member which is used to fabricate the structure were conducted. The static and dynamic performances of floating PV generation structure are evaluated through the FE analysis and the experiment, respectively. Moreover, the structural safety evaluation and buckling analysis of SMC FRP vertical compression member are also conducted by the FE analysis, and the structural behavior of SMC FRP member under compression and pullout is investigated by the experiments. From this study, it was found that the structural system composed of pultruded FRP and SMC FRP members are safe enough to resist externally applied loads.

단면 내 응력분포를 고려한 I형 및 Box형 단면의 PFRP 압축재의 설계

최진우,김재욱,주형중,윤순종,Choi, Jin-Woo,Kim, Jae-Wook,Joo, Hyung-Joong,Yoon, Soon-Jong 한국복합신소재구조학회 2011 복합신소재구조학회논문집 Vol.2 No.1

펄트루젼 FRP 구조용 부재는 많은 유용한 역학적, 물리적 성질 때문에 토목분야에서 구조부재의 매력적인 대체부재로 고려될 수 있다. 그러나 펄트루젼 FRP는 탄성계수가 상대적으로 낮고, 부재의 단면이 복부와 플렌지 등의 얇은 판요소로 구성되어 있기 때문에 압축재로 설계할 때 구조적인 안정성은 매우 중요한 고려사항이 된다. 따라서, 압축을 받는 구조용 부재의 설계를 위해, 판요소의 좌굴 및 후좌굴강도를 고려해야 한다. AISC/LRFD의 강구조 설계기준에서는, 후좌굴강도에 추가적인 단면 내 일정하지 않은 응력분포의 영향을 형상계수(form factor)를 사용하여 고려하고 있다. 이 논문에서는 압축력을 받는 펄트루젼 FRP 구조용 부재의 형상계수를 해석적으로 연구하였으며, 형상계수를 설정하는 과정에 대하여 제안하였다. Pultruded fiber reinforced polymeric plastic (PFRP) structural members may be one of attractive alternatives of the structural members in the civil engineering applications because of its many advantageous mechanical properties. However, they have relatively low modulus of elasticity and also cross-sections of structural shapes are composed of thin plate components such as flange and web. Therefore, structural stability is an important issue in the design of pultruded structural compression members. For the design of pultruded structural member under compression, buckling and post-buckling strengths of plate components may be taken into account. In the structural steel design following AISC/LRFD, in addition to the buckling strength, the nonuniform stress distribution in the section is incorporated with a form factor. In this paper, the form factor for the design of PFRP structural member under compression is investigated through the analytical study. Furthermore, the process for the determination of the form factor is suggested.

복합신소재를 사용한 거푸집

최진우,윤순종,Choi, Jin-Woo,Yoon, Soon-Jong 한국복합신소재구조학회 2012 복합신소재학회논문집 Vol.3 No.1

The Polychaete Assemblages on the Continental Shelf off the Southeastern Coast of Korea

최진우,고철환,Choi, Jin Woo,Koh, Chul Hwan The Korean Society of Oceanography 1989 韓國海洋學會誌 Vol.23 No.4

Polychaete assemblages and their responses to habitat conditions were investigated in the southeastern continental shelf of Korea. The result of cluster analysis revealed that the study area could be divided into two regions, one including the shallow coastal region and the other the offshore region. The shallow coastal region sustained 4 polychaete assemblages: Nothria holobranchiata assemblage in the most northern part of fine sediments off Pohang, Magelona-Maldane assemblage off Gampo, Ophelina acuminata assemblage in the middle coastal area off Ulsan, Nothria conchylega assemblage in the south part off Pusan. These coastal polychaete assemblages contained less than 10 species per station and showed very low species diversity (H' = 1.22-1.52). The offshore also contained 4 assemblages: Terebellides-Aglaophamus assemblage in the northern and deep area of very fine sediments, Myriochele oculata and Spiophanes kroyeri assemblages in the central area of sandy bottoms, and Ninoe palmata assemblage in the southern offshore of sandy bottom. The offshore assemblages showed rather more species and higher diversity than coastal assemblages (H' = 1.90-2.26). The offshore region consisting of sandy sediment showed very low population densities. Some dominant species showed specific preference to sediment types and this phenomenon could be detected through their feeding modes. Depth or bottom temperature seems to be related to the distribution of most dominant worms. Thus the polychaete assemblages of the study area are found to be under the control of both a gradient of sedimentary properties and that of bottom temperature.

복합신소재를 사용한 말뚝기초의 개발 및 시공

최진우,윤순종,Choi, Jin-Woo,Yoon, Soon-Jong 한국복합신소재구조학회 2011 복합신소재학회논문집 Vol.2 No.3

The Distribution and Feeding Guilds of the Polychaete Community in the West Coast off Kunsan, Korea

최진우,고철환,CHOI, JIN-WOO,KOH, CHUL-HWAN The Korean Society of Oceanography 1992 韓國海洋學會誌 Vol.27 No.3

The distribution pattern of macrobenthic polychaete worms and their feeding guild structures were investigated along the coastal region off Kunsan (southeastern Yellow Sea) during the winter season. The polychaete worms, the most dominant infauna, comprised 54 species in 30 families and showed their mean density of 300. indir./m$^2$). Dominant species in the study area were Stermaspis scutata, Lumbrineris cruzensis, Notomastus sp., Nephtys polybranchia, Praxillella affinis. Polychaeres were assigned to 12 feeding guilds and BMX (burrowing, motile, muscular pharynx) was the most dominant feeding guild (26%). Muddy sediments sustained more polychaete worms which showed burrowing (65%), motile (72%), and non-tentaculate strategies (92%), while sandy sediments contained more filter feeders (32%) and sessile (63%), and more tentaculate worms (49%). The sediment grain size was suggested to be the prime factor selecting the polychaete feeding guild.

이력 자료를 활용한 GPS 교통정보의 효율적인 필터링 방법

최진우,양영규,Choi, Jin-Woo,Yang, Young-Kyu 한국공간정보학회 2008 한국공간정보시스템학회 논문지 Vol.10 No.3

텔레매틱스 교통정보(해당 도로의 통과 시간이나 속도)를 제공하기 위해 교통자료를 수집하는 다양한 장비들이 존재하지만, 최근 GPS(Global Positioning System) 위성 신호가 민간에 공개된 이후 수신 기술의 발달과 더불어 교통 자료를 수집하는 수단으로써 많은 주목을 받고 있다. GPS를 사용하면 기존의 도로 상에 직접 매설하여 쓰이던 검지기에 비해 투자 유지비용이 낮고 차량 운행 축을 따라 지속적으로 세밀한 자료를 자동적으로 수집할 수 있다는 장점을 가진다. 하지만, 기존의 타 검지기에 의해 수집된 자료에 적용해 온 교통 정보 필터링 기법들을 GPS 자료에 그대로 적용하기에는 여러 가지 제약사항이 존재한다. 본 논문에서는 GPS로부터 수집되는 교통 자료 중 비정상적인 흐름으로 도로를 통과한 자료를 필터링하여 사용자들에게 보다 정확한 교통 정보를 제공할 수 있는 방법을 제시한다. 먼저 가까운 과거의 자료로부터 사분위수(quartile)와 해당 도로의 가중치에 의한 패턴을 구축하고, 이후 이를 실시간 자료에 적용해 비정상적인 자료를 필터링 해냄으로써 더욱 신뢰성 있는 교통정보를 생성할 수 있게 되는 것이다. 또한, 서울 강남대로를 대상으로 실제 GPS 수신기를 장착하고 운행한 차량들이 수집한 통행속도 자료를 바탕으로 이력 자료를 활용해 비정상적인 자료를 필터링한 대표 통행 속도가 기존의 필터링 방법들을 통한 값보다 더욱 정확한 결과를 보임을 증명하였다. For obtaining telematics traffic information(travel time or speed in an individual link), there are many kinds of devices to collect traffic data. Since the GPS satellite signals have been released to civil society, thank to the development of GPS technology, the GPS has become a very useful instrument for collecting traffic data. GPS can reduce the cost of installation and maintenance in contrast with existing traffic detectors which must be stationed on the ground. But. there are Problems when GPS data is applied to the existing filtering techniques used for analyzing the data collected by other detectors. This paper proposes a method to provide users with correct traffic information through filtering abnormal data caused by the unusual driving in collected data based on GPS. We have developed an algorithm that can be applied to real-time GPS data and create more reliable traffic information, by building patterns of past data and filtering abnormal data through selection of filtering areas using Quartile values. in order to verify the proposed algorithm, we experimented with actual traffic data that include probe cars equipped with a built-in GPS receiver which ran through Gangnam Street in Seoul. As a result of these experiments, it is shown that link travel speed data obtained from this algorithm is more accurate than those obtained by existing systems.