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- 저자 : 홍준희(Jun-Hee Hong) (검색결과 181 건)
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홍준희,장탁순,송창빈,김병인,Hong, Jun-Hee,Jang, Tak-Soon,Song, Chang-Bin,Kim, Byung-In 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.2
This paper focuses on possibility to design and fabrication new combination of bullet core to substitute current toxic material of heavy metal such as lead by environment-friendly ones. The core is designed as dual structure to manipulate the core center of gravity easily by combining materials, which of basis is tungsten of low cost and easily acquired. Those combinations are W-M series such as W-Cu, W-Sn, W-Cu-Sn, and W-Cu-Ni to target the density of lead, $11.34g/cm^3$ through powder-metallurgy. Out of four, combination of W-Cu-Ni shows the highest compression density of 96% and is confirmed as the most suitable substitution for lead due to the excellent property of matter and sintering. All combination samples is simulated on the PRODAS software for designing and structure analysis by adjusting the center of gravity of dual core samples forward and backward. The simulations confirm the similarity of current bullet core with respect to properties of mass, aero dynamics, and flying stability.
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2중 코어 구조의 소화기용 친환경 탄자 제조 및 특성 분석
홍준희,장탁순,송창빈,강대화,Hong, Jun-Hee,Jang, Tak-Soon,Song, Chang-Bin,Kang, Dae-Wha 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.3
This paper focuses on the properties analysis of 9mm bullet dual structure core to substitute current lead core by environment-friendly combination of W-Cu-Ni system high density composite materials. So the four combination samples were made of dual core with the different center of gravity location backward or forward compare to that of lead type bullet, and we experimented about the performance of 9mm bullet dual structure core. In the experimental results, the outer shape of core of four environment friendly samples on the target maintain marginally, while the current lead core bullets are completely crushed after hitting the target. The penetration depth of environment friendly samples excel seven times to lead type bullet and the three out of four samples with forward adjusted center of gravity penetrate deep as twice as ones backward. The impact tolerance of all four samples satisfies military specification, however, more firing tests are required to improve reliability of scattering distribution.
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웹 기반 면대면 교육시스템 HALS - HALS 활용에 대한 평가 및 분석 -
홍준희,손원기,최중인,Hong Jun-Hee,Son Won-Gi,Choi Jung-In 한국공학교육학회 2000 공학교육연구 Vol.3 No.1
HALS (Hypermidia Aided Learning System) is very useful computer networking educational system in knowledge-driven society, and has been developed by Kyungwon University. This system has three characteristics; 1) face-to-face learning, 2) ultra high-speed information networking, 3) web-based hypermedia courseware. So, the purpose of this paper is to introduce the application to engineering educational program (electrical engineering: electric power system, control system). For this purpose it is described the definition and characteristics of HALS. Next, it is represented the model of electrical engineering educational program applied to HALS and the developed courseware.
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강덕수 ( Duck Soo Kang ),김지선 ( Jee Sun Kim ),홍준희 ( Jun Hee Hong ) 한국외국어대학교 언어연구소 2007 언어와 언어학 Vol.0 No.39
Duck-soo Kang.Jee-sun Kim.Jun-hee Hong. 2007. A Study of Obstruents in Yakut through Analysis of Borrowed Words from Russian. Language and Linguistics 39, 1-16. One of the most important constraints in Yakut is connected with syllabic structure. Its syllabic structure is based on CV. So the constraint of "NoGeminates" is strictly applied. And the harmony between features is also considered important. Yakut has the strict constraint on the phonotactical relations. In Yakut a feature [constricted glottis] works more vigorously than [voiced]. This feature is combined with a feature [+back] or [+lab], making new constraints on the initial place: *#[+back, -CG], *# [+lab,+CG]. Finally, consonantal assimilation in obstruents of Yakut is dominated by 2 lows of constraints. VowelHarmony >> Ident-CV[pl] >> NCP >> *[+palatal]# >> Ident-IO; *#[+back, -cont][+back,-high] >> *#[+back,-CG], *# [+lab,+CG] >> [+cont] >> NoGem >> Ident-IO >> *[+voiced]#
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중학생의 체육수업 동기, 운동정서, 수업태도 차이 및 관계분석
홍준희 ( Jun Hee Hong ),차민정 ( Min Jung Cha ),이현영 ( Hyun Young Lee ) 한국스포츠심리학회 2010 한국스포츠심리학회지 Vol.21 No.4
The purpose of this study is to provide the fundamentals that will contribute to developing an ideal physical education class and efficient teaching methods by analyzing the students` motivation affects and attitudes in physical education classes. In order to accomplish the purpose of this study a survey was conducted with 548 boys and girls attending middle school student in Seoul. The collected data was analyzed with SPSSWIN VERSION 12.0 program, such Cronbach`s α, exploratory factor analysis, t-test, one-way ANOVA and standard multiple regression. The finding of this study were as follows: First, there was statistically significant according to the different sex of middle school students` motivation, affects and attitude in physical education classes. Second, there was statistically significant according to the different grade of middle school students` motivation, affects and attitude in physical education classes. Third, there was statistically significant relationship between middle school students` motivation, affects and attitude in physical education classes. Forth, middle school students` intrinsic motivation and positive affect have a lot of effect on attitude in physical education classes.
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다자 간 환경에서 수직 분할된 데이터에서 프라이버시 보존 k번째 항목의 score 계산
홍준희(Jun Hee Hong),정재열(Jay Yeol Jung),정익래(Ik Rae Jeong) 한국정보보호학회 2014 정보보호학회논문지 Vol.24 No.6
데이터 마이닝은 보유한 데이터를 가공하여 패턴 분석이나 마케팅 등에 활용할 수 있는 유용한 정보를 얻어내는 기술이다. 그러나 이러한 데이터 마이닝 기술을 사용 시 데이터의 제공자의 개인정보가 의도치 않게 유출 될 가능성이 존재하게 된다. 이러한 정보의 유출을 막기 위하여 여러 가지 프라이버시를 보호하는 기법이 연구되고 있다. 수직 분할 데이터는 같은 집단에 관한 데이터가 복수의 소유자에게 나누어 제공되어 있는 상태를 말한다. 이러한 수직 분할된 데이터에서 프라이버시를 보호하면서 k번째 항목과 (k+1)번째 항목을 score값을 이용하여 구분하는 방법이 개발되었다. 그러나 기존의 연구에서는 양자간의 환경에서만 사용이 가능하였기 때문에 본 논문에서는 Paillier 암호화 기법을 사용하여, 기존의 연구를 다자간 환경으로 확장한 기법을 제안한다. Data mining is a technique to get the useful information that can be utilized for marketing and pattern analysis by processing the data that we have. However, when we use this technique, data provider’s personal data can be leaked by accident. To protect these data from leakage, there were several techniques have been studied to preserve privacy. Vertically partitioned data is a state called that the data is separately provided to various number of user. On these vertically partitioned data, there was some methods developed to distinguishing k th element and (k+1) th element by using score. However, in previous method, we can only use on two-party case, so in this paper, we propose the extended technique by using paillier cryptosystem which can use on multi-party case.
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