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Al-10.5wt%Si-2wt%Cu 다이 캐스팅용 2차 지금의 기계적 특성과 전기전도도에 미치는 Sr 양과 유지시간의 영향 2
신상수 ( Sang Soo Shin ),김명용 ( Myung Yong Kim ),염길용 ( Gil Yong Yeom ) 한국주조공학회 2010 한국주조공학회지 Vol.30 No.6
This study evaluates the influence of strontium addition and holding time on mechanical properties for Al-10.5wt%Si-2wt%Cu secondary die-casting alloy and the measured electrical conductivity of modified alloys. A general improvement in the mechanical properties of the alloy was observed after adding the strontium. Ultimate tensile strength, elongation and electrical conductivity of modified alloys were improved by increasing strontium content and holding time. From these results, the optimal strontium content and holding time were identified on the mechanical properties of Al-10.5wt%Si-2wt%Cu secondary die-casting alloys.
고강도 Al-Zn기 다이캐스팅 합금개발에 관한 연구 1
신상수 ( Sang Soo Shin ),염길용 ( Gil Yong Yeom ),김억수 ( Eok Soo Kim ),임경묵 ( Kyung Mook Lim ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.10
Al-Zn based alloys are the most common types of wrought Al alloys. Although Al-Zn alloys have high strength, they cannot be applied to a conventional casting process. In this study, Al-Zn-based alloys applicable to a die casting process were developed successfully. The developed Al-45 wt% Zn-based alloys showed a fine equiaxed grain structure and high strength. A fine equiaxed grain having an average size of 25 μm was obtained by the die casting process. The UTS and elongation of the new alloy are 475 MPa and ~3.5%, respectively. In addition, we elucidate the effect of a Zn addition on variations in different mechanical properties and the microstructure characteristics of (Al96.3-xZnxCu3Si0.4Fe0.3) x=20, 30, 40, and 45 wt% alloys fabricated by a die casting process.
고강도 Al-Zn기 다이캐스팅 합금개발에 관한 연구 3
신상수 ( Sang Soo Shin ),염길용 ( Gil Young Yeom ),손현진 ( Hyun Jin Son ),임경묵 ( Kyoung Mook Lim ),박익민 ( Ik Min Park ) 대한금속재료학회(구 대한금속학회) 2015 대한금속·재료학회지 Vol.53 No.9
In this study, the microstructural evolution and various characteristics of Al-20~45wt%Zn alloys were investigated. In terms of microstructure, as the amount of Zn addition to the alloys increased, the α-phase size decreased and the α+η non-equilibrium solidification phase fraction increased. Also, increasing Zn content improved the wear resistance of the alloys, but reduced the damping capacity and toughness of the alloys. Their physical properties of the Al-Zn alloy with high Zn content, specifically the wear resistance and toughness, were superior to those of commercial ALDC12 alloys for die-casting. Based on these results, we considered the possibility of application of the developed Al-Zn alloy as a structural material.
고강도 Al-Zn기 다이캐스팅 합금개발에 관한 연구 2: 중력주조, 유동성평가
신상수 ( Sang Soo Shin ),임영훈 ( Young Hoon Lim ),김억수 ( Eok Soo Kim ),임경묵 ( Kyung Mook Lim ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.7
In this study, we evaluated the fluidity of the Al-Zn based alloys which exhibit excellent mechanical properties. We conducted computer simulations of fluid flow using the results of DSC, DTA analysis and Javabased Materials Properties software (J. Mat. Pro). Such computer simulations were then compared with the results obtained from experimental observations. The computer simulation results and the experimental results were very similar in fluidity length. It was found that the fluidity length of Al-Zn alloys is improved by increasing the Zn content while decreasing the solidus temperature of an alloy. In addition, we elucidate the effect of Zn addition on variations in different mechanical properties and the microstructure characteristics of (Al-xZn3Cu0.4Si0.3Fe) x=20, 30, 40, and 45 wt% alloys fabricated by gravity casting.
신상수 ( Sang Soo Shin ),임경묵 ( Kyung Mook Lim ),김억수 ( Eok Soo Kim ),이재철 ( Jae Chul Lee ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.4
Ultrafine-grained or nanostructured alloys usually lack the strain hardening capability needed to sustain uniform tensile deformation under high stresses. To circumvent this problem, we fabricated the Cubased composite reinforced with the 3-dimensionally interconnected Cu5Zr phase using the combined technique of rapid quenching and subsequent hot-rolling. The alloy exhibited a tensile ductility of ~2.5% together with a strength of 1.57 GPa, which exceeds the values of most commercially available Cu-Be alloys. In this study, we elucidated the structural origin of the high strength and tensile ductility of the developed alloy by examining the thermal stability of the Cu5Zr reinforcing phase and the energy (work) absorption capability of the Cu matrix.
신상수(Shin, Sang-Soo),신영전(Shin, Young-Jeon) 비판과 대안을 위한 사회복지학회 2014 비판사회정책 Vol.- No.45
자살의 예측요인으로 알려진 자살생각에 대한 사회적 관심이 증가하면서 자살생각의 기전을 설명하고자 하는 다양한 시도가 등장하고 있다. 개인을 둘러싼 환경이 개인의 건강에 영향을 준다는 근거가 속속 등장하고 있는 가운데, 이번 연구에서는 2009년 지역사회건강조사 자료를 이용하여 다수준 로지스틱 회귀분석을 이용하여 자살생각에 미치는 개인 요인과 지역 요인을 동시에 고려하여 살펴보았다. 분석 결과, 개인 수준에서는 연령이 증가할수록, 학력이 낮을수록, 이혼·사별·별거 및 미혼이 기혼에 비해, 소득이 감소할수록, 스트레스가 많을 때, 우울할 때, 주관적 건강감이 나쁠 때 자살생각 오즈비가 통계적으로 유의하게 높은 것으로 나타났다. 지역 수준에서는 지역박탈지수와 기초생활보장수급자비율, 재정자주도를 각각 대입하여 분석하였는데, 지역박탈지수와 기초생활수급자 비율이 증가할수록 자살생각의 오즈비가 낮아지는 것으로 나타났으나 지역규모를 구분하여 분석한 결과에서는 군 지역에서만 유의하였다. 이러한 분석 결과를 바탕으로 자살생각 가능성을 완화하고 방지할 수 있는 실천적 함의를 제시하였다. As social interest in suicidal ideation known as a predicting factor of suicide is rising, various attempts are made to explain the mechanism of suicidal ideation. With grounds published for the effects of an environment surrounding an individual on his or her health, this study set out to take into account both personal and neighborhood factors influencing suicidal ideation through multi-level logistic regression analysis based on the Community Health Survey data of 2009. The analysis results show that the odds ratio of suicidal ideation was statistically significantly high at the personal level when they were older, had lower educational backgrounds, were divorced, bereaved, or separated and a single rather than being married, had lower family income, suffered more stress, felt depressed and had a bad subjective sense of health. At the neighborhood level, analysis was conducted by introducing the regional deprivation index, the rate of National Fundamental Livelihood Security recipients, and financial autonomy rate. As a result, the odds ratio of suicidal ideation dropped as the regional deprivation index and rate of National Fundamental Livelihood Security recipients rose. When the local scale was taken into account during analysis, it turned out that only rural areas generated significant results. Suggestions addressed the strategies to pacify and prevent suicidal ideation among community residence.
보건의료분야 다수준 분석 연구의 체계적 문헌 고찰: 국내 연구동향과 비뚤림 위험 평가를 중심으로
신상수 ( Shin Sang Soo ),우경숙 ( Woo Kyung Sook ),신영전 ( Shin Young-jeon ) 한국보건사회연구원 2015 保健社會硏究 Vol.35 No.4
이 연구는 체계적 문헌고찰을 통해 국내 보건의료분야 다수준 분석의 동향을 파악하고 논문의 질적 평가를 목적으로 비뚤림 위험 평가를 시행하여 향후 보건의료 분야 다수준분석기법의 유용성을 높이는 목적으로 연구를 수행하였다. 2000년 1월 1일부터 2014년 12월 31일까지 국내외 웹 기반 학술 데이터베이스에 출판된 59편의 논문을 분석한 결과는 다음과 같다. 첫째, 통계적 유의성을 보인 지역 변인은 전체의 20.9%로 다소 낮았다. 둘째, 가장 많이 사용된 지역 변인은 사회문화적 특성이었으며, 지역에 대한 평판 관련변인 중 40.7%가 통계적 유의성을 보였다. 셋째, 건강행태·지식·신념 관련 요인 연구가 전체의 34.4%로 다수를 차지하였다. 넷째, 4편의 연구가 개인변인에 의한 연구 결과의 비뚤림 위험 가능성이 나타났다. 지역변인 측면에서는 급내 상관계수 관련정보 미제공(28편, 47.4%), 30개 이하 지역표본 사용(29편, 49.2%), 지역변인 간 상관관계분석 미실시(36편, 69.2%), 지역변인 기초 정보 제공 미흡(15편, 25.4%)으로 인하여 비뚤림위험 가능성이 확인되었다. 신뢰성 높은 자료의 이용, 다양한 지역변수의 활용, 변인간 상관관계를 포함한 비뚤림 위험 방지를 위한 사전 점검, 지역 특성이 건강에 영향을 미치는 기전의 구체화 등의 작업이 이루어진다면 다수준 분석은 질병에 대한 이해와 효과적인 개입수단을 발견하는데 보다 유용한 수단으로 활용될 수 있을 것이다. This study was conducted to identify the status of studies on multilevel analysis concerning Koreans` health, validate the assessment of risk of bias to assess the quality of journals, and provide a basis for practicing multilevel analysis for future public health. We analyzed a total of 59 studies published from January 1, 2000 to December 31, 2014 in domestic and international journal databases. The findings include the following. First, only 20.9% of total had statistical significance. Second, the regional reputation was the most frequently used variable with a statistical significance on health. Third, 34.4% were on health behaviour, knowledge or attitude. Fourth, 4 studies (6.7%) were identified with a potential risk of bias caused by individual variables. There were journals with missing in ICC (28, 47.4%), the use of regional sample under 30 (29, 49.2%), missing in a correlation analysis between regional variables (36, 69.2%), and missing in basic information on region data (15, 25.4%). These would cause the risk of bias. It will be a useful analytical tool to understand the causes of health when executing reliable data, using diverse regional variables, doing pretest to prevent risk of bias such as correlation analysis between regional variables and specifying mechanisms of health affected by regional characteristics.