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제주도 연안 갈치 채낚기 어구의 생력화 : 1. 연속식 채낚기어구의 모형 실험
서두옥,정용진,김석종,이창헌,김고환,박용석 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-
The authors carried out a model experiment of continuous hairtail hand line on the rooftop in order to obtain the fundamental data on elimination of labor with hairtail hand line in the coast of Jeju The results are as follow : 1. The continuous main line was rotated smoothly by driving roller. 2. The branch lines and hooks on a main line which was rotated by rotary machine were entangled slightly. 3. The branch lines attached to rubbered model of hairtails to hooks were rotated continuously by the rotary machine.
제주도 연안 갈치 채낚기 어구의 생력화 : 1.연속식 채낚기어구의 모형 실험
서두옥,정용진,김석종,이창헌,김고환,박용석 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-
The authors carried out a model experiment of continuoius hairtail hand line on the rooftop in order to obtain the fundamental data on elimination of labor with haritail hand line in the coast of Jeju. The results are as follow ; 1.The continuous main line was rotated smoothly by driving roller. 2.The branch lines and hooks on a main line which was rotated by rotary machine were entangled slightly. 3. The branch lines attached to rubbered model of hairtails to hooks were rotated continuously by the rotary machine.
이창헌,김고환,서두옥 제주대학교 해양연구소 2000 해양자원연구소연구보고 Vol.24 No.-
In order to obtain the fundamental data on behavioral hearing capabilities. the hearing indices of coralfish chromis notatus and black rockfish sebastes inerms which were caught around Cheju island was calculated by their auditory thresholds. The hearing indices of coralfish and black rockfish were 29.1 and 81 on the condition of ambient noise. 10.0 and 19.3 on the condition of white noise respectively.
이창헌,김고환,서두옥 제주대학교 해양연구소 2000 해양과환경연구소 연구논문집 Vol.24 No.-
In order to obtain the fundamental data on behavioral hearing capabilities, the hearing indices of coralfish chromis notatus and black rockfish sebastes inermis which were caught around Cheju island was calculated by their auditory thresholds. The hearing indices of coralfish and black rockfish were 29.1 and 81 on the condition of ambient noise, 10.0 and 19.3 on the condition of white noise respectively.
수중 가청음에 의한 쏨벵이의 청각능력 : 2. 청각 임계비
이창헌,박용석,문종욱,강창익,김고환,서두옥 제주대학교 해양연구소 1999 해양자원연구소연구보고 Vol.23 No.-
수중 가청음은 어군의 행동 제어와 해양목장화에서 음향 순치에 많이 이용되고 있다. 수중 가청음에 의한 어류반응 해석을 하기 위해서는 물고기의 청각능력을 정확히 파악할 필요가 있으며,오래전부터 여러물고기의 청각능력을 관련된 연구가 수행되었다.
Numerical and Experimental Investigation on the Tube Forming in the Radial-Forward Extrusion
Ko Beong-Du,Jang Dong-Hwan,Choi Ho-Joon,Hwang Beong-Bok Korean Society for Precision Engineering 2005 International Journal of Precision Engineering and Vol.6 No.2
In this paper, the tube forming by radial-forward extrusion is analyzed by numerical simulation and experiments. The paper discusses the effect of process variables such as gap height, relative gap width and die comer radius on tube forming. The influence of deformation patterns of flange in radial extrusion on forward extrusion for tube forming is investigated and summarized in terms of the maximum forming force and hardness variations along the extrusion path. Furthermore the external defects are shown experimentally during the forming operation. Based on finite element analysis in conjunction with experimental test in Al alloy, analysis is performed for important parameter combination in order to reduce forming defects. Eventually, the process parameters for safe forming are suggested in order to reduce the forming defects.
Subjective Experience on Virtual Reality-Assisted Mental Health Promotion Program
Hyebin Ko,Hyun Ju Lim,Jeonghyun Park,Kyungwon Kim,Hwagyu Suh,Byung Dae Lee,Young Min Lee,Eunsoo Moon,Du-Ri Kim,Jong-Hwan Park,Myung-Jun Shin,Yean-Hwa Lee 대한신경정신의학회 2024 PSYCHIATRY INVESTIGATION Vol.21 No.4
Objective Mental health promotion programs using virtual reality (VR) technology have been developed in various forms. This study aimed to investigate the subjective experience of a VR-assisted mental health promotion program for the community population, which was provided in the form of VR experience on a bus to increase accessibility.Methods Ninety-six people participated in this study. The relationship between the subjective experience and mental health states such as depression, anxiety, perceived stress, and quality of life was explored. The subjective experience on depression and stress before and after VR program treatment was compared using the Wilcoxon signed-rank test. The satisfaction with the VR-assisted mental health promotion program was examined after using the VR program.Results The VR-assisted mental health promotion program on a bus significantly improved subjective symptoms such as depression (p=0.036) and perceived stress (p=0.010) among all the participants. Among the high-risk group, this VR program significantly relieved subjective depressive feeling score (p=0.033), and subjective stressful feeling score (p=0.035). In contrast, there were no significant changes in subjective depressive feelings (p=0.182) and subjective stressful feelings (p=0.058) among the healthy group. Seventy-two percent of the participants reported a high level of satisfaction, scoring 80 points or more.Conclusion The findings of this study suggest that the VR-assisted mental health promotion program may effectively improve the subjective depressive and stressful feelings. The use of VR programs on buses to increase of accessibility for the community could be a useful approach for promoting mental health among the population.