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Vibrational energy flow analysis of penetration beam-plate coupled structures
송지훈,홍석윤,강연식,길현권 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.3
This study concerns the transmission of vibrational energy through beam-plate junctions by energy flow analysis, which is an analytic tool for predicting the frequency averaged vibration response of built-up structures in the medium to high frequency ranges. A semiinfinite beam perpendicularly connected to an infinite plate is studied using the wave transmission approach. To calculate the power transmission and the reflection coefficients of the beam-plate junction, compatibility and equilibrium conditions are applied when each wave component is incident on the beam and plate, respectively. Power coefficients are calculated and plotted against frequencies for different dimensions and the directivity pattern of the scattered waves in the plate show close agreement with that of the rigid inclusion as the frequency increases. The results obtained are applied to the finite beam and the circular plate coupled structure, and the energy densities obtained from energy flow analysis show better agreement with analytic solution results as frequencies are increased.
New Report of Two Species of Genus Pentias (Crustacea: Malacostraca: Isopoda) from South Korea
송지훈,민기식 한국환경생물학회 2015 환경생물 : 환경생물학회지 Vol.33 No.2
Two marine isopods, Pentias hayi Richardson, 1904 and P. thompsoni Collinge, 1916 were verified as unrecorded species in South Korea. The genus Pentias is reported for the first time in South Korea. These two isopods were collected from Heuksan-do Island and Ulleung-do Island from South Korea, respectively. We provide descriptions of the diagnostic characteristics, illustrations of two species and their partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) for molecular characteristics.
New Record of Three Isopod Species (Crustacea: Malacostraca: Isopoda) from South Korea
송지훈,민기식 한국환경생물학회 2015 환경생물 : 환경생물학회지 Vol.33 No.2
Three marine isopods, Symmius yamaguchiensis Shimomura, 2008, Colanthura pigmentata Kensley, 1980 and Synidotea nipponensis Nunomura, 1985 are reported for the first time in South Korea. The family Chaetiliidae, and genera Symmius and Colanthura are new to South Korea. We provide descriptions of the diagnostic characteristics, illustrations of three species and their partial sequences of the mitochondrial cytochrome c oxidase subunit 1 (CO1) for molecular characteristics.
Sensor Network 활용을 위한 To-Be 프로세스 설계 : 자동차, 조선 산업을 중심으로
송지훈,임재환 한국정보기술융합학회 2010 한국정보기술융합학회논문지 Vol.3 No.1
국내 제조 기업들은 완제품 위주의 대량생산 전략 채택에 따른 기업의 내실화 미흡 및 핵심 부품 기술과 노하우 등 지식을 바탕으로 한 선진형 비즈니스 전환이 미숙하다. 일반 제조기업의 생산현장에는 전사적 자원관리 시스템을 도입하고, 기존에 설치된 제조설비에 전자 장치를 결합, 부품 포장 단위 수준으로 바코드등을 부착하여 사용하고 있지만, 기업관리 시스템과 생산 시스템과의 단절 지점이 발생하여 원활한 정보흐름이 발생되지 못하고 있다. 따라서 본 논문에서는 자동차, 조선의 제조업을 중심으로 Sensor Network 를 활용하기 위한 To-Be 프로세스를 설계하고자 한다.
First Record of Cleantioides planicauda (Crustacea: Isopoda: Holognathidae) from South Korea
송지훈,민기식,김민섭 한국동물분류학회 2014 Animal Systematics, Evolution and Diversity Vol.30 No.1
Cleantioides planicauda (Benedict, 1899) has previously been recorded in China and Japan. In the presentstudy, to our knowledge, we report for the first time the occurrence of this species in South Korea. Here, weprovide detailed descriptions and illustrations of the diagnostic characteristics of C. planicauda. Further, forthe first time, we determined the partial sequence of mitochondrial cytochrome c oxidase subunit 1 (CO1)gene of C. planicauda for molecular characteristic. Additionally, we provide a key to the Korean species anddistribution of the genus Cleantioides. As a result of this study, four species of the genus Cleantioides,including C. planicauda, have now been recorded in South Korea.