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선택적 레이저 용융방식 고분자 적층제조공정 시 적층조건에 따른 용융 풀 및 형상 재현성 변화에 관한 연구
심은정(Eun Jung Shim) 한국생산제조학회 2021 한국생산제조학회지 Vol.30 No.6
This study aims at securing the shape reproducibility of the final product manufactured using additive manufacturing. Accordingly, the width and depth of the melt pool were quantified by energy density according to the laser power and scan speed using scanning electron microscope analysis. The laser power and scan speed ranges were 5-50 W and 800-5800 mm/s, respectively. The minimum energy density and laser power for the output were 0.06 J/㎣ and 5 W, respectively. The optimal process condition within the tolerance range of the specimen was confirmed to be the energy density range of 0.24-0.35 J/㎣. For an energy density of 1.0 J/㎣ or higher, the melting point of the material is higher, and thermal flow convection occurs, resulting in a large expansion of the final product. This study confirmed the effect of the melt pool on the final product in a selective laser melting system.
심은정(Eun-Jung Shim),김위근(Wi-Geun Kim) 한국언론정보학회 2016 한국언론정보학보 Vol.76 No.2
이 연구는 후쿠시마 원전 사고 이전과 이후를 비교해 우리나라 원전 보도의 일반적 특성과 보도 프레임 차이를 확인하기 위한 것이다. 이를 위해 중앙 일간신문과 원전 소재 지역 일간신문을 선정해 이들 신문이 게재한 원전 관련 기사에 대한 내용 분석을 실시했다. 연구 결과, 후쿠시마 원전 사고 이후 우리나라 원전에 대한 보도는 크게 늘어난 것으로 나타났다. 또한 이전에 주로 경제적 측면이 강조됐던 우리나라 원전 보도는 후쿠시마 원전 사고 이후 사회적 차원이 강조되기 시작했다. 그리고 우리나라 원전 보도 기사가 주요 기사로 다뤄지는 계기가 됐다. 한편 후쿠시마 원전 사고 이후 우리나라 원전 보도의 프레임 역시 크게 변화했다. 당연하게도 환경 안전 프레임이 크게 증가한 것으로 나타났다. 이는 후쿠시마 원전사고를 계기로 우리나라 원전의 안정성과 관련된 보도가 대폭 늘어났기 때문으로 보인다. 특히 원전 소재 지역의 일간신문에서 환경 안전 프레임은 후쿠시마 원전 사고 이전에도 다른 프레임과 비교해 가장 많은 29.3%였는데, 그 이후에는 77.6%로까지 증가한 것으로 확인됐다. The aim of this study is to see the change of the general characteristics and frame of nuclear power plant news in Korea from comparing the before Fukushima nuclear accident in Japan on March 11, 2011 with the after. To this aim, the national daily newspapers and the local daily newspapers in Busan located nuclear power plants were selected, and the content analysis of the newspaper stories about nuclear power plants was done. In research results, the stories about nuclear power plants in Korean newspapers increased greatly after Fukushima nuclear accident. Before the accident the nuclear power plant stories about economy held a large majority, while after the accident the stories about society held. Fukushima nuclear accident served as the momentum that the nuclear power plant stories in Korea became main news. Meanwhile, the frame of nuclear power plant stories in Korean newspapers changed greatly after the accident. Justly the environmental security frame increased greatly, because of increasing greatly the stories about security of nuclear power plants with Fukushima nuclear accident. Particularly in the local daily newspapers in Busan before the accident the environmental security frame was 29.3% of stories about nuclear power plants, and after the accident the frame was 77.6%.
심은정(Shim, Eun-jung) 역사학연구소 2014 역사연구 Vol.- No.26
This is a study on the national leisure project in the period of the Fifth Republic. A state had life itself as the subject of ‘government’ with having expanded an interest in nation"s life sphere. The state"s ‘governmentality’, which intervenes in nation"s life, reached the expansion of leisure, which is time except nation"s labor, into organization. The purpose of this study was to grasp the professional baseball, which was launched in this period, from the context of the state"s interest in leisure, with seeing that the Fifth Republic considered leisure in the sphere of state policy. What examines relationship between a country and professional baseball implies to examine the character of the state project, which is indicated in professional baseball, the nation"s operation behavior, or the state"s strategy for intervening in life. This study focused on clarifying the state"s role, which was revealed in the process of the launch and in the professional baseball. And, the attempt was made for defining professional baseball as ‘national leisure’ in a sense of leisure that the state provided targeting nation. The Fifth Republic launched professional baseball as part of the national leisure project and positively intervened so that the professional baseball can be settled in nation"s leisure life. Professional baseball, which was provided by a country, was opened daily and has proceeded with being settled quickly as people"s daily culture. In other words, the professional baseball, which was launched in the Fifth Republic, is the attempt that the state aimed to positively organize national leisure. This is the period and a case that needs to be examined significantly in examining a change of stateness.
광전류 향상을 위한 유기 전해질 활용 양극산화 된 TiO<sub>2</sub> 전극의 광활성 연구
심은정(Shim, Eun-Jung),허아영(Heo, Ah-Young),박민성(Park, Min-Sung),윤재경(Yoon, Jae-Kyung),주현규(Joo, Hyun-Ku) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
In this paper, TiO₂ nanotube is prepared and the preparation is influenced by electrochemical etching rate and chemical dissolution rate. Especially, the chemical dissolution rate is lowered as the length TiO₂ nanotube increases. Titanium foil were anodized at various bias or current such as 20V, 55V and 0.1A (bath temperature 25?C) in organic electrolytes (ethylene glycol, glycerol) and then annealed at 450?C and 650?C to obtain the crystallized tubular TiO₂ on the Ti foil. Higher efficiency (89.1%) for the Cr(VI) reduction was obtained with the prepared sample compared to that (20.9%) with the sample in 0.5% HF electrolyte earlier studied.
심은정(Shim, Eun-Jung),박민성(Park, Min-Sung),허아영(Her, A-Young),주현규(Joo, Hyun-Ku),윤재경(Yoon, Jae-Kyung) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
The present works were performed that titanium foil was anodized in various dilution ratios of seawater and distilled water with 10V external voltage applied, then annealed at 450?C to obtain TiO₂ on the Ti substrate. The prepared samples were characterized by instruments (XRD, SEM, and photocurrent) and used to investigate rate of hydrogen production in photoelectrochemical cell as well as Cr(VI) reduction. As the results of experiments, the anodized TiO₂ in seawater electrolytes, which are ranged from 15 to 50 times dilution of seawater, was showed a relatively higher hydrogen production (ca. 97~110 umol/hr-cm²) and Cr(VI) reduction (ca. 95% reduction).
유방암 환자에서의 디스트레스의 유병률 및 디스트레스가 삶의 질에 미치는 영향
전수연,심은정,황준원,함봉진,Chun, Soo-Yeon,Shim, Eun-Jung,Hwang, Jun-Won,Hahm, Bong-Jin 한국정신신체의학회 2010 정신신체의학 Vol.18 No.2
연구목적 디스트레스를 조기에 발견하여 치료하는 것이 효율적인 암 환자의 관리에 필수적이라는 인식이 확대되고 있다. 본 연구에서는 유방암 환자들의 디스트레스의 유병률을 조사하고, 그 디스트레스가 삶의 질에 미치는 영향을 알아보았다. 방 법 서울의 한 대학병원 유방암 환우회 환자 95명을 대상으로 병원우울불안척도, 불면증심각도척도, 사건충격척도 개정판, Functional assessment of cancer therapy-Breast(FACT-B)를 시행하였다. 결 과 디스트레스의 유병률은 우울 26.3%, 불안 26.3%, 불면 13.7%, 외상후스트레스장애 증상 24.3%였다. 한가지 이상의 디스트레스를 겪고 있는 환자는 전체의 47.4%였으며, 이들은 정상군에 비해 FACT-B 총점으로 측정한 삶의 질 평균점수가 유의하게 낮았다(82.91 vs. 107.20, p<0.001). 정상범위의 환자들에서도 디스트레스와 삶의 질은 유의한 관계를 보였다. 결 론 유방암 환자의 디스트레스를 조기에 발견하기 위한 주기적인 선별검사와 적절한 치료가 필요하다. Objectives : Early detection and proper management of distress are known to be important for efficient care in cancer patients. The aim of this study was to investigate the prevalence of distress and to evaluate its influence on quality of life in subjects with breast cancer. Methods : A total of 95 patients were recruited from a breast cancer patient community of a general hospital in Seoul. The Hospital Anxiety and Depression Scale(HADS), the Insomnia Severity Index(ISI), the Impact of Event Scale-Revised(IES-R) and the Functional Assessment of Cancer Therapy-Breast(FACT-B) were measured. Results : The prevalence of anxiety, depression, insomnia and posttraumatic stress disorder symptom among breast cancer patients was 26.3%, 26.3%, 13.7%, 24.3%, respectively. Nearly half(47.4%) of total subjects were under one or more significant distress, and they showed significantly lower mean FACT-B total score than patients without distress(82.91 vs. 107.20, p<0.001). Distress was negatively correlated with the quality of life to a significant level even in patients who were in normal range of distress scale scores. Conclusion : These results support the importance of regular screening and proper management of distress for breast cancer patients.