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마이크로 복합가공기의 동특성 및 강성 측정에 관한 연구
장성현(Sung-Hyun Jang),이창조(Chang-Jo Lee),홍정표(Jung-Pyo Hong),최영휴(Young-Hyu Choi) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Recently, there were many researches for utilizing the technology of microfactory in Korea. With one among the research results, the micro multi-tasking machine tool (MMMT) which has the milling and EDM machining functions was developed for BT or IT factory applications. This machine tool is desktop size machine tool which has a dimension of 338×450×450 ㎣. Since high machining accuracy is necessary for MMMT, in the design phase, it was designed to have a high stiffness and the light weight by using FEA and the structural optimization method. In this paper, we also measured the frequency response functions (FRFs) and compliance functions to evaluate the dynamic characteristics of the prototype MMMT by using impulse hammer test. Moreover, we compared those experimental results with the computed FRFs and compliance functions. Consequently, the comparison of natural frequencies and compliance of MMMT reveals almost similar dynamic characteristics.
이창조(Chang Jo Lee),장성현(Sung Hyun Jang),최영휴(Young Hyu Choi) 한국생산제조학회 2010 한국공작기계학회 추계학술대회논문집 Vol.2010 No.-
For developing various forms of wave power generator to do the electricity generation, in this paper, we have a study on the design of the wave power generator woth wave and resonance. By using the wave and resonance, the mass of the wave power generator which stands on the wave can move. And then by using the geared transmission system, the wave power generator can do the electricity generation.
이창조(Chang-Jo Lee),장성현(Sung Hyun Jang),정우영(Woo-Young Jung),김성수(Sung-Soo Kim),최용규(Yong-Gyu Choi),최영휴(Young-Hyu Choi) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
PHC (pretentioned spun high strength concrete) pile is widely used in construction site for foundation works as an essential step of work process to increase bearing capacity. But the several construction methods to hammer pile in the ground caused vibration and noise to generate. However, PHC screw pile which has the half circle type thread of screw is the noiseless and vibrationless pile because of inserting it into the ground by rotation of auger. The shear stresses or maximum stress for pile were occurred by pressure of soil layer during the constructing a PHC screw pile. So, we carried out theoretical calculation and FE analysis to calculate safety factor of PHC screw pile.
중·고령 북한이탈주민의 남한 사회적응을 통해 바라본 사회통합
김명희(Myeong Hee Kim),신은서(Eun Suh Shin),임정수(Jeong Su Lim),김지민(Ji Min Kim),장성현(Sung Hyun Chang) 한국노년학회 2022 한국노년학 Vol.42 No.2
본 논문은 중·고령 북한이탈주민의 남한 사회적응 경험을 심층적으로 파악하여 사회통합의 의미를 찾아보고자 하였다. 이를위해 남한 사회 입국 당시 50세 이상인 중·고령 북한이탈주민 12명을 대상으로 인터뷰를 시행하였고 수집된 자료를 Colaizzi의 현상학적접근방법을 활용하여 분석하였다. 연구결과 3개의 범주와 7개의 주제 묶음, 23개의 주제가 도출되었으며, 1범주 <적응 초기 단계>, 2범주 <적응과 통합>, 3범주 <노년기 삶의 의미와 바람>이다. 중·고령 북한이탈주민은 처음에 남한사회에 대해 긍정적인 인상도받지만, 낯선 남한 땅에서 경제적, 심리적, 사회문화적 어려움과 특히, 중·고령이며 북한이탈주민이라는 이중적 고충을 경험하고 있었다. 그러나, 이들은 정착 기간이 지남에 따라 가족과 지인, 공적인 자원의 도움과 피나는 노력으로 남한사회에 적응해 나갔으며 나아가봉사와 기부로 사회 한 구성원으로서 사회에 이바지해 나가며 남한사회와 통합되어 감을 알 수 있었다. 이들에게 노년기는 안정적정착을 넘어 자녀들의 성공적 미래를 기대하며 나아가 건강하게 가족을 만날 그날을 고대하는 것이었다. 연구 결과를 토대로 중·고령북한이탈주민의 남한 사회적응과 주체적 사회구성원으로서의 사회통합을 위한 정책 마련과 사회 복지적 함의를 제시하였다. This study aims to figure out the meaning of social integration by understanding the social adaptation experiences of middle and old aged North Korean refugees residing in South Korea. We conducted in-depth interviews with 12 North Korean refugees who entered the South Korea at least 50-year-old, and analyzed the collected data using Colaizzi’s phenomenological approach. The results were derived with 3 categories, which are <the Early Stages of Adaptation>, <the Adaptation and Integration>, and <the Meaning and Wishes of the Old Life>. Seven top-topics, and twenty-three sub-topics were also derived. Participants had a positive first impression of the South Korean society, whereas they faced double trouble as an old refugee, alongside economical, psychological, and socio-cultural difficulties. As time goes by, they started to adapt to South Korean society with their desperate effort and supports from their family, acquaintances, and public resources. Furthermore, they contributed to South Korean society by volunteering and donating being integrated into their new home. Beyond a settlement in South Korea, they are greatly looking forward to reunification of their families in the near future as well as praying for successful life of their children. Based on study results, social services and policies were suggested for enhancing their adaptations.
장성현,이정준,이정호 대구대학교 환경기술연구소 2004 미래환경기술 Vol.1 No.1
성덕댐의 식물플랑크톤 군집의 동태를 조사하기 위해 2002년 4월부터 12월까지 5개의 정점을 선정하여 계절별로 실시하였다. 본 조사에서 출현한 식물플랑크톤은 8강 14목 27과 52속의 총 117 taxa였다. 이 중 규조강이 가장 많은 66 taxa로 전체 출현종의 56.5%를 차지하였다. 녹조강과 남조강은 각각 34 taxa (29.2%)와 5 taxa (4.4%)가 출현하였으며, 와편모조강과 황갈조강, 유글레나강은 각각 4 taxa (3.6%), 4 taxa (3.6%), 3 taxa (2.7%) 순으로 나타났다. 식물플랑크톤 군집의 종다양도지수는 10월이 가장 낮은 0.617 이었으며, 12월이 가장 높은 0.757로 나타났다. 우점종은 12월 조사의 정점 4를 제외한 모든 시기와 정점에서 규조류가 우점하였다. Dynamics of phytoplankton communities were investigated at five sampling stations in Sungdug Reservoir from April to December 2002. Total 117 phytoplankton taxa identified from the study were classified into 92 species, 11 varieties and 14 unidentified species belonging to 52 genera, 27 families, 14 orders and 8 classes. There were 66 taxa (56.5%) of Bacillariophyceae, 34 taxa (29.2%) of Chlorophyceae, and the other taxa were Cyanophyceae (4.4%), Chrysophyceae (3.6%), Eugpenophyceae (3.6%) and Dinophyceae (2.7%). The species diversity index of phytoplankton community showed the minimum in October as 0.617 and the maximum in December as 0.757. The taxa of Bacillariophyceae were dominated at all the sampling stations in every sampling times except St. 4.