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靑少年非行의 豫防管理方案 : Focused on Socio-Environmental Factors
안동규,곽희범 동국대학교 대학원 1997 大學院硏究論集-東國大學校 大學院 Vol.27 No.-
Possibly one of the most serious problem that has emerged from the social issues in korea can be found in the juvenile delinquency and penomena.. Generally, the socio-environmental factors said to be most important to prevent our juvenile from offending. And according to the recent statistics, we can find that the juvenile delinquency are much more frequently caused by socio-environmental factors. This factors be made up of unsound environment, negative effect of mass media, and lackness of regional community activity. The findings of this study is as follows. First, it is necessary that we urgently make network among policy stakeholders -public officers, public interst organizations, and mass media. Second, on one hand reducing the disfunction of commercial oriented mass media, on thr other hand promoting the educational function of it. Specially, legal restrictions must be enforced to serve juvenile delinquency prevention. Third, for our juvenile to be grow soundly, regional community's activities must be increased immediately. In conclusion, it is very urgent for us to be conscious of the fact that the effective prevention and management of juvenile deliquency is very importent thing in this time. If we persist in ignoring the seriousness of juvenile delinquency, our society will be made to do our contrition.
고출력 CW Nd:YAG 레이저를 이용한 CSP 1N 박판재 절단시 공정변수의 절단표면특성에 미치는 영향
안동규,김민수,이상훈,유영태,박형준 한국공작기계학회 2004 한국공작기계학회 추계학술대회논문집 Vol.2004 No.-
The objective of this research work is to investigate the influence of process parameters, such as power of laser, travel speed of laser and material thickness, on roughness and striation of the cut surface for the case of cutting of CSP IN sheet using high power Nd:YAG laser with continuous wave (CW). In order to find the practical cutting region and the relationship between process parameters on the roughness and the striation, several laser cutting experiments are carried out. From the results of experiments, the allowable cutting region and an optimal cutting speed for each cutting condition have been obtained to improve the quality of the cut surface. In addition, it has been shown that the surface roughness is related to the number of striation and depth of valley of the cut surface.
딤플형 내부구조체를 가진 Isb 판넬의 정적 굽힘 특성
안동규,문경제,한길영 朝鮮大學校 機械技術硏究所 2006 機械技術硏究 Vol.9 No.1
본 연구에서는 덤플형 내부 구조제를 가진 ISB 판넬의 굽힘 및 파손 특성을 분석/고찰하고자 한다. 딩플형 내부 구조체를 가진 ISB 판넬의 설계조건에 따른 변형 형상, 최대하중 및 최대하중에서의 변위와 같은 특성치 및 파손 형태를 분석하기 위하여 정적 3접 굽힘 시 험을 통한 하중-변위 곡선과 파손 형상을 얻었다. 또한, 본 실험 결과를 이용하여 ISB 판 넬 설계 변수의 굽힘 특성 및 파손 모드 영향성을 분석하였다. 본 연구 결과 딩플형 내부 구조체를 가진 ISB 판넬의 굽힘 및 파손 특성은 덤플형 내부구조체의 반경비와 ISB 판넬 의 재료 방향에 따라 제어 가능함을 알 수 있었다. The objective of this pater is to investigate into bending and failure characteristics of ISB panel with dimple shapes as inner structures. Through three-points bending test, the force-displacement curve and the failure shape are obtained to examine the deformation pattern, characteristic data including maximum load and displacement at the maximum load and failure pattern for the ISB panel. In addition, the influence of design parameters for ISB panel on the bending stiffness and failure mode has been found. From the results of the experiments, it has been shown that bending and failure characteristics of the ISB panel can be controlled by the ratio of radius and the direction of the material.
VLM-ST 공정과 삼단역전 쾌속 툴링 공정을 이용한 3차원 제품 정형가공에 관한 연구
안동규,이상호,양동열 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-
The technical combination of RP and RT has a potential for rapid manufacturing of three-dimensional parts. In the present work, a new RP system, VLM-ST, is proposed to manufacture net shapes of 3D prototypes. ㅁ human head shape and a knob shape are manufactured by the VLM-ST apparatus. In addition, a new RT technology, which utilizes a RTV molding technique and a triple reverse process technique, is proposed to manufacture net shapes of 3D plastic parts using prototypes of VLM-ST. A plastic part of the knob shape is produced by the proposed RT technology. The combination of the proposed RP and RT enables the manufacture of a plastic knob within two days.
선형 열선절단기를 이용한 발포폴리스티렌 폼 판재 절단시 일반 절단경사각이 제품 정밀도에 미치는 영향에 관한 연구
안동규,양동열,한길영 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.2
본 연구에서는 EPS 폼의 일반 경사 열선절단시 절단경사각이 제품 정밀도에 미치는 영향에 대하여 연구하였다. EPS 폼의 일반 경사 열선절단시 EPS 폼 내부 온도분포가 제품정밀도에 매우 큰 영향을 미침으로 일반 경사 열원 모델과 완전 경사 적응형 유한요소격자를 이용한 비정상상태 3차원 열전달해석을 수행하였다. 해석 결과 열선절단기 운영조건내에서 EPS 폼의 일반 경사 열선절단시 x 축 절단경사각, 즉 회전축이 열선 절단 방향과 일치하는 경사각, 이 절단폭과 모서리 용융길이 미치는 영향은 각각 0.03 ㎜ 와 0.01 ㎜ 이하였다. EPS 폼의 일반 경사 열선절단시 절단 경사각이 제품 정밀도에 미치는 영향을 실험적으로 분석/고찰하기 위하여 일반경사 절단 실험을 수행하였다. 실험 결과는 해석결과와 매우 잘 일치 하였으며, x축 절단경사각이 제품정밀도에 미치는 영향은 매우 작았다. 이 결과로부터 제안된 유한요소해석 모델의 타당성을 입증하였다. 또한, EPS 폼의 일반 경사 열선절단시 y축 절단경사각에 비하여 x축 절단경사각이 제품 정밀도에 미치는 영향이 매우 미미함을 알 수 있었다. In the present study, the influence of cutting angle on the dimensional accuracy, such as kerfwidth and the part quality. in hotwire cutting of EPS foam for the case of generally-sloped cutting with two cutting angles is investigated. Transient heat transfer analysis using a generally-sloped heat faux model arid a fully conformed mesh structure is carried out to estimate an accurate temperature field in the EPS foam. From the results of the analysis. it has heen shown that the influence of cutting angle about the x-axis in which the rotational axis is normal to hotwire cutting direction on kerfwidth and the melted length in the edge is less than 0.03 rnm and 0.01 mm in the operating range of the hotwire cutter, respectively. In order t o experimentally investigate the influence of cutting angle for generally-sloped cutting on the kerfwidth and the part quality of the cut part, inclined cutting tests with two cutting angles are carried out. Through a comparison of the computed results with the experimental results. the proposed numerical method of analysis is verified. Based on these results, it has been shown that the influence of cutting angle about the y-axis in which the rotational axis is normal with hotwire cutting direction is appreciably negligible in comparison with that of cutting angle about the x-axis.