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선체 구조강성 변화에 따른 컨테이너선의 파랑하중 연구 2 : 수직 전단력 및 굽힘모멘트
김영식(KIM YoungShik),김진하(KIM JinHa),김병완(KIM ByoungWan) 한국항해항만학회 2008 한국항해항만학회 학술대회논문집 Vol.2008 No.추계
최근, 대형 및 고속 컨테이너선의 설계 단계에서 엄밀한 구조해석의 필요성이 강조되고 있다. 선박의 신뢰성 있는 구조 및 운동 해석을 위해서는 운항선박에 작용하는 선형 및 비선형 파랑하중의 초기 추정이 매우 중요하다. 따라서 본 논문에서는 9분할 모형에 상이한 강성을 갖는 백본센서를 장착하여 2가지 구조 강성을 갖는 선박 모형을 제작하였다. 제작된 분할모형을 사용하여 규칙 및 불규칙 파랑 조건에서 운항하는 컨테이너선의 시나리오를 모형시험을 수행하였다. 시험으로부터 운항하는 컨테이너 선박에 발생하는 수직 전단력, 수직 굽힘 및 비틀림 모멘트 등의 파랑하중 응답을 비교분석하였고 이를 구조해석을 위한 초기자료를 활용하고자 한다. In the design process of shipbuilding for very large and high speed vessel, exact structural analysis is getting emphasized. To have resonable results of structural analysis, the estimation of initial wave loads is very important. In this paper, a experimental method which use backbone sensor and divided ship model is introduced to estimate the wave loads on a going containership. A experiment following the proposed method was conducted, and vertical shear force, vertical bending moment and torsional moment are estimated.
Kim, Jeongah,Jang, Sangwon,Choi, Mijung,Chung, Sooyoung,Choe, Youngshik,Choe, Han Kyoung,Son, Gi Hoon,Rhee, Kunsoo,Kim, Kyungjin Korean Society for Molecular and Cellular Biology 2018 Molecules and cells Vol.41 No.8
Parkinson's disease (PD) is a neurodegenerative disease characterized by progressive degeneration of dopaminergic (DAergic) neurons, particularly in the substantia nigra (SN). Although circadian dysfunction has been suggested as one of the pathophysiological risk factors for PD, the exact molecular link between the circadian clock and PD remains largely unclear. We have recently demonstrated that $REV-ERB{\alpha}$, a circadian nuclear receptor, serves as a key molecular link between the circadian and DAergic systems. It competitively cooperates with NURR1, another nuclear receptor required for the optimal development and function of DA neurons, to control DAergic gene transcription. Considering our previous findings, we hypothesize that $REV-ERB{\alpha}$ may have a role in the onset and/or progression of PD. In the present study, we therefore aimed to elucidate whether genetic abrogation of $REV-ERB{\alpha}$ affects PD-related phenotypes in a mouse model of PD produced by a unilateral injection of 6-hydroxydopamine (6-OHDA) into the dorsal striatum. $REV-ERB{\alpha}$ deficiency significantly exacerbated 6-OHDA-induced motor deficits as well as DAergic neuronal loss in the vertebral midbrain including the SN and the ventral tegmental area. The exacerbated DAergic degeneration likely involves neuroinflammation-mediated neurotoxicity. The $REV-erb{\alpha}$ knockout mice showed prolonged microglial activation in the SN along with the over-production of interleukin $1{\beta}$, a pro-inflammatory cytokine, in response to 6-OHDA. In conclusion, the present study demonstrates for the first time that genetic abrogation of $REV-ERB{\alpha}$ can increase vulnerability of DAergic neurons to neurotoxic insults, such as 6-OHDA, thereby implying that its normal function may be beneficial for maintaining DAergic neuron populations during PD progression.
Design of Linked 2-DOF IPMC Actuator Moudule
Youngshik Kim(김영식),Bong-Jo Ryu(유봉조),Kyoung-Wan Koo(구경완),Buhyun Shin(신부현) 대한전기학회 2019 전기학회논문지 Vol.68 No.7
The 2-DOF IPMC module is introduced in this research. Each rotation axis of 2-DOF IPMC module is perpendicular each other. A second segment of IPMC is attached across to end tap of the first segment of IPMC directly without any frame. The link method with 2 IPMC actuator is assemble using a slot simply and conductive epoxy adhesive is used for wiring. The single IPMC strips are connected to rigid links, the open-loop control of the IPMC manipulator. The inverse kinematics of the linked 2-DOF IPMC was established. The experimental results show 2-DOF motion of the IPMC actuator module. This 2-DOF IPMC actuator module can be improved or modified for example by adding more links to even more increase the workspace by adding an extra soft link to the tip of the manipulator for extra soft manipulation.
Isolation and identification of mosquito-borne zoonotic diseases in slaughterhouse in Daejeon
Youngju Kim,Gyurae Kim,Sunkyong Song,Youngshik Jung,Seojin Park,Sang-Joon Lee,Ho-Seong Cho,Yeonsu Oh 한국동물위생학회 2023 한국동물위생학회지 (KOJVS) Vol.46 No.2
This study was performed to investigate the distribution of mosquito vectors related to the zoonotic disease in Daejeon. Samples were taken using a blacklight trap once a month from March to November 2021 at the slaughterhouse in Daejeon. A total of 820 mosquitoes were captured and classified into 5 genera and 8 species. Among the collected mosquitoes, 319 (38.9%) and 295 (35.93%) were Aedes vexans nipponii and Culex pipiens pallens , respectively, making them the dominant species. The overall number of mosquitoes collected started to increase from May and reached the largest value of 329 (40.12%) in June. Trapped mosquitoes are created 72 pools by environmental condition and by species. The pools were tested by PCR methods for 7 zoonotic pathogens. Flaviviruspositive products were confirmed by DNA sequencing. Japanese encephalitis viruses were detected in 3 pools collected from cow lairage (Culex pipiens pallens ) in May, cow by-product processing room (Aedes vexans nipponii ) in June and cow lairage (Mansonia uniformis ) in June. Culex flavivirus were detected in 4 pools. Based on the results of this study, it is considered that continous surveillence of mosquitoes in livestock assembly facilities (slaughterhouse) should be performed for controlling mosquito populations and mediating disease spread by mosquitoes.
김영식(Youngshik Kim),심현호(Hyun-Ho Shim),이경민(Kyung-min Lee),신부현(Buhyun Shin) 제어로봇시스템학회 2017 제어·로봇·시스템학회 논문지 Vol.23 No.7
The proposed two degree-of-freedom electromagnetic oscillatory actuator has a novel structure to combine two electromagnetic actuators of the moving-coil type. In order to rotate the actuator, the coil is attached to the moving frame, acting as the moving-coil type. There is three magnets, in the middle and inside each moving frame. The direction of the magnetism is perpendicular to the coil in order to change the direction of current induced to the coil and oscillate the moving frame. There are two types of forces applied to the 2-DoF electromagnetic oscillatory actuator. The magnetic force between the magnets holds the moving frame on the left or right side. That magnetic force is called as a holding force. The electromagnetic force generates the oscillatory motion when the current is applied to the coil. The overall size is 15 mm (W) × 15 mm (D) × 50 mm (H). All frames are made of ABS plastic using a rapid prototyping process to reduce inertia. The magnet material is ND35. The dynamic modeling and electromagnetic simulations and experiments are conducted. Resonance frequency is 18.5 Hz with only moving parts and 15.5 Hz including middle magnet. The laser beam profile shows 2-D motion for swing motion for various applications.