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자전연소합성법에 의한 ZrB<sub>2</sub> 세라믹분말합성 및 NaCl의 영향
김진성,원창환,Kim, Jinsung,Nersisyan, Hayk,Won, Changwhan 한국재료학회 2014 한국재료학회지 Vol.24 No.5
Zirconium boride is an artificial or which is rarely found in the nature. $ZrB_2$ is popular in the hard material industry because it has a high melting point, excellent mechanical properties and chemical stability. There are two known methods to synthesize $ZrB_2$. The first involves direct reaction between Zr and B, and the second is by reduction of the metal halogen. However, these two methods are known to be unsuitable for mass production. SHS(Self-propagating High-temperature Synthesis) is an efficient and economic method for synthesizing hard materials because it uses exothermic reactions. In this study, $ZrB_2$ was successfully synthesized by subjecting $ZrO_2$, Mg and $B_2O_3$ to SHS. Because of the high combustion temperature and rapid combustion, in conjunction with the stoichiometric ratio of $ZrO_2$, Mg and $B_2O_3$; single phase $ZrB_2$ was not synthesized. In order to solve the temperature problem, Mg and NaCl additives were investigated as diluents. From the experiments it was found that both diluents effectively stabilized the reaction and combustion regime. The final product, made under optimum conditions, was single-phase $ZrB_2$ of $0.1-0.9{\mu}m$ particle size.
김진성(Jinsung Kim),허훈(Hoon Huh),이강욱(Kangwook Kang),하대율(Daeyul Ha),여태정(Taejung Yeo),박순조(Soonjo Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper deals with dynamic tensile characteristics for the polypropylene composite used in an IP(lnstrument Panel). This polypropylene composite is adopted in the dash board of a car, especially PAB(Passenger Air Bag) module. The dynamic tensile characteristics are important because the PAB module undergoes high speed deformation during the airbag expansion. The operating temperature of a car varies from -30캜 to 110캜 according to the specification. The dynamic tensile tests are performed at the low temperature(-30캜), room temperature(21캜) and high temperature(85캜). The tensile tests are carried out at strain rates of nine intervals ranged from 0.001/sec to 200/sec. The flow stress increases as the strain rate becomes higher. The flow stress decreases at the high temperature while the strain rate sensitivity increases. Finite element analysis of the tensile test with the special specimen was carried out with unmodified stress-strain curve obtained from the ASTM IV specimen directly. The analysis result shows that the load response is almost same with the experimental result but the strain is rather larger than the experimental result. The stress-strain curves were modified on the basis of the gage length change rate, that is the change of gage length divided by the crosshead stroke. The analysis result with the modified stress-strain curves showed good agreement with the experimental result. The material properties obtained from this research will be useful to estimate the airbag expansion accurately in engineering sense.
비대칭 모자형 단면 사각관의 정적 붕괴 실험 및 결과의 임의성
김진성(Jinsung Kim),임지호(Jiho Lim),허훈(Hoon Huh),이문용(Munyoung Lee),정병훈(Byunghun Jung) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, we discuss the result of the static collapse test of the asymmetric top hatted rectangular tube. The result includes collapse mode, maximum load, and absorbed energy. Five types of asymmetric top hatted rectangular tube were used. Two types of tube with laser welded are different in their flange length. Three types of tube with spot welded have different distances between the spot welding points. From the experimental results, we investigate the characteristics of energy absorption and collapse mode of each specimen type. And we discuss the uncertainty of energy absorption following the irregular collapse mode. Finally, in designing the asymmetric top hatted rectangular tube, we discuss how to consider the uncertainties of the collapse modes and absorbed energy during the Static collapse.
김진성 ( Jinsung Kim ),장세운 ( Seun Jang ),김정준 ( Jungjun Kim ),김다솜 ( Dasom Kim ),조중휘 ( Joongwhee Cho ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
본 연구는 뷔페형 카페테리아 식당에서 근무하는 직원들이 계산 업무를 덜고 조리 업무에 집중하여 업무 성과, 직무만족도를 높일 수 있도록 돕는 카페테리아 무인계산시스템을 제안한다. 무인 계산시스템의 작동과정은 크게 두 가지이다. 첫째, 식판을 가져오면 그 위의 음식들을 촬영하여 음식 부분의 ROI(Region of Interest,ROI) 이미지를 추출해낸다. 둘째, 미리 학습된 모델에 앞서 추출한 ROI 이미지를 입력하여 식판 위에 어떤 이미지들이 있는지 분석한다. 그 후 해당 음식과 가격을 GUI 로 출력하여 사용자가 확인 후 결제할 수 있도록 한다.
개인정보 제공에 대한 인터넷 사용자의 경제적 행동에 관한 연구: Privacy Calculus, CPM 이론을 중심으로
김진성 ( Jinsung Kim ),김종기 ( Jongki Kim ) 한국정보시스템학회 2017 情報시스템硏究 Vol.26 No.1
Purpose The purpose of this study is to deduct the factors for explaining the economic behavior of an Internet user who provides personal information notwithstanding the concern about an invasion of privacy based on the Information Privacy Calculus Theory and Communication Privacy Management Theory. Design/methodology/approach This study made a design of the research model by integrating the factors deducted from the computation theory of information privacy with the factors deducted from the management theory of communication privacy on the basis of the Dual-Process Theory. In addition, this study, did empirical analysis of the path difference between groups by dividing Internet users into a group having experience in personal information spill and another group having no experience. Findings According to the empirical analysis result, this study confirmed that the Privacy Concern about forms through the Perceived Privacy Risk derived from the Disposition to value Privacy. In addition, this study confirmed that the behavior of an Internet user involved in personal information offering occurs due to the Perceived Benefits contradicting the Privacy Concern.
임진-한탄강 유역 출토 다각면원구의 시공간 비교 연구 : 연천 전곡리와 포천 용정리 구석기유적을 중심으로
김진성(Jinsung Kim) 한국구석기학회 2020 한국구석기학보 Vol.- No.42
This study analyzed the measurement and statistical index based on the external characteristics of the polyhedral excavated from the paleolithic industries of the Imjin-Hantan river basin due to the inherent characteristics of the relics. Based on this, I tried to establish the tradition of paleolithic industry on the Imjin-Hantan river basin, which represents the paleolithic of the Korean peninsula, by comparing time and space in the water system. The spatial scope of study is Imjin-Hantan river basin, mid-western part of the Korean peninsula where realistically research is possible. The temporal scope of the study is the polyhedral found in the paleolithic industries of the Imjin-Hantan river basin. The analysis is 59 polyhedrals excavated from Jeongok-ri and Yongjeong-ri. First, the time comparison analysis was conducted based on the formation process each site, absolute dating, and soil layer level, and as a result, the size and weight of the polyhedral decreased as the paleolithic period moved from the early to the late period. In addition, it was confirmed that the sphericity is gradually lowering. Also, the comparison result between the mainstream and tributaries showed that the mainstream polyhedral was larger and heavier than the tributaries polyhedral. And the tendency of the mainstream to appear more spherical than the tributary was revealed. The traditional paleolithic industry of the Imjin-Hantan river basin, which directly strikes pebble stones, continued to be complemented until the upper paleolithic industry replaced by blade became popular. Therefore, it was confirmed that the technical and cultural characteristics of stone-tools technology were consistent with this study. Also, in order to understand more, it is necessary to discuss the efficiency of the process of making polyhedral from the evolutionary point of view of mankind and the effectiveness of using the polyhedral. 본 연구는 유물의 정의 또는 고유한 특성에 기인하여 임진-한탄강 유역 구석기유적에서 출토된 다각면원구의 외형적 특징을 기반으로 측정 및 통계 지수를 분석하였다. 이를 바탕으로 수계 내에서의 시공간 비교 연구를 통해 한반도의 구석기시대를 대표하는 해당 유역이 내포한 구석기 석기 공작의 전통을 정립해보고자 하였다. 연구의 공간적 범위는 수계상 임진-한탄강 유역으로 한정하고 연구의 실질적 가능 범위인 한반도 중서부지역으로 설정하였다. 시간적 범위는 해당 수계 내에서 다각면원구가 출토된 구석기시대 유적이다. 세부적으로 연천 전곡리와 포천 용정리의 다각면원구 59점이 이에 해당한다. 다각면원구에 대한 분석을 바탕으로 시공간적 비교 연구 결과, 일정한 패턴이 인지되는 유의미한 결과를 도출할 수 있었다. 우선 각 유적의 형성 과정과 절대 연대, 층위에 기반한 시간 비교 연구 결과 구석기시대의 전기에서 후기로 이동하면서 다각면원구의 크기는 작아지고, 무게는 줄어들었다. 이와 함께 석기의 보편적 정의인 구형을 이루는 정도가 시간의 흐름에 따라 변화하고 있음도 확인하였다. 본류역과 지류역으로의 공간 구분을 통해서 진행한 대하천과 지천 간의 비교 연구에서는 본류의 다각면원구가 지류의 다각면원구에 비해 크고 무거운 것으로 나타났다. 그리고 석기의 구형 정도는 본류가 지류보다 외형적으로 구형에 더 근접한 형태를 띠는 경향이 드러났다. 임진-한탄강 유역의 전통적인 석기 공작은 하안의 자갈돌을 원석으로 하여 직접타격을 통해 제작한 전기 구석기시대의 문화가 석인 석기로 대체되는 후기의 양상이 유행하기 이전까지 보완·유지되는 성격을 가진다. 이러한 석기 제작의 기술문화적 특성이 본 연구와 맥을 같이 하고 있음을 확인하였다. 이에 대한 이해를 위해서는 도구가 가진 본래의 특성인 적정한 수준의 구형 유지 과정을 살펴야 한다. 인류의 진화적 관점에서 제작의 효율성과 완성된 석기의 사용에 대한 효용성에서의 접근이 필요할 것으로 판단한다.