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N,N,N-trimethylhydrazinium 염을 기반으로 한 고에너지형 이온성액체로 켓추진제의 합성 및 연소특성 평가
손기혁,오민석,최성호 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
고에너지를 함유한 이온성액체 추진제는 기존 고에너지 물질 대비 열안정성이 좋고, 과산화수소와 반응하여 자연발화 추진제로 사용할 수 있으며, 낮은 독성과 비휘발성 액체특성을 가지고 있어 로켓 추진제 적용성이 매우 높다. 최근 고에너지형 이온성 액체로 많은 수의 질소 원자를 포함하는 물질이 주목받고 있다. 이른바 “high-nitrogen” 이라 불리는 이러한 물질들은 매우 높은 생성열을 갖는 고에너지형 물질의 특별한 유형이다. 높은 생성열은 많은 수의 N-N 결합과 C-N 결합으로 발생한다. 본 연구에서 N,N,N-trimethylhydrazinium을 기반으로 한 고에너지형 액체추진제를 합성하였다. 1H-NMR, FT-IR을 통해 구조적 특성을 확인하였고 DSC, TGA, 진동식 점도계를 통해 물리화학적 평가를 하였다. 한편, 자동점화 및 연소지연시간(ID)을 측정하기 위해 초고속 카메라를 이용하여 측정하였다.
손기혁,정성민,이수용,고상훈 한국산업식품공학회 2016 학술대회 및 심포지엄 Vol.2016 No.04
본 연구의 목표는 쌀가루의 물리화학적 특성을 분석하여 쌀면을 제조하는데 있어 최적 품종을 결정하는 것이다. 쌀 면 제조에 사용된 쌀 품종은 아밀로오스 함량이 다른 품종인 밀양 278호, 한아름 2호, 백진주를 사용하였다. 본 연구 에서는 쌀을 건식 제분하여 100-150 mesh 체를 통과한 쌀가루를 쌀면 제조에 이용하였다. 쌀가루의 물리화학적 특성 은 호화특성, thermo-mechanical 방법을 통해 분석하였으며, 쌀가루의 아밀로오스 함량에 따라 호화특성 및 thermomechanical 특성에서 차이를 나타냈다. 품종별 호화 개시 온도는 밀양 278호, 한아름 2호, 백진주 각각 70.0, 62.7, 63.0 ℃이었으며, 고아밀로스 함량을 갖는 쌀가루 품종인 밀양 278호는 높은 호화 온도를 나타내며, 호화 시 점도의 특성 또한 다른 품종과 차이를 보였다. 제조된 쌀면의 특성은 면의 질감분석, 조리손실률, 국물의 탁도, 단면사진을 통해 분 석하였다. 밀양 278호, 한아름, 백진주로 제조한 쌀 건면의 경도는 각각 4.55, 2.24, 1.89 N의 값을 나타내었다. 면을 삶았을 경우에 백진주는 면이 형성되지 않고 잘게 끊어져 면의 질감을 측정을 할 수 없었으며, 밀양 278호와 한아름 2호 쌀면의 Rmax 값은 각각 0.86, 0.46 N을 나타내었다. 밀양 278호 품종의 경우 다른 두 품종에 비해 호화 시 높은 점도를 나타내고, 낮은 조리 손실률 등 제면 가공적성에 적합할 것으로 판단된다.
개인적 특성, 시청빈도, 중계-시청 시간일치도가 스포츠 시청 요인에 미치는 상대적 영향력 분석
손기혁(Sohn, Ki-Hyuk),원영신(Won, Young-Sin),고대선(Ko, Dae-Sun) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.2
This research was to find out which independent variables among personnel characteristic, watching frequency, and broadcasting-watching time coincidence, effect to the dependent factors(media factor, sport external factor, and sport internal factor) of watching sports on TV, and also which dependant factor relatively influences more compared to other factors. The subjects were a total of 1,192 people selected by checking the goodness of fit on this research. The data were collected from June 26th to July 8th in 2010 by KBS(Korean Broadcast System) and were analyzed frequency analysis, exploratory factor analysis, Cronbach’s α, correlation analysis, and hierarchical regression analysis using the SPSS 18.0 program. The result of hierarchical regression analysis were appeared as follows. First, broadcasting-watching time coincidence had an influence on all the dependent factors(media factor, sport external factor, and sport internal factor). Second, gender, income, and watching frequency had an effect on media factor. Third, gender, age, and level of education affected sport external factor. Last, gender and age influenced sport internal factor. In conclusion, broadcasting-watching time coincidence had an influence most rather than others, and it was appeared the different influences relatively depending on the factors.
World Baseball Classic 에서 나타난 뉴스프레임 분석
손기혁(Sohn Ki-Hyuk),조성원(Jo, Sung-Won) 한국웰니스학회 2017 한국웰니스학회지 Vol.12 No.1
본 연구는 지상파 3사 대표 뉴스 프로그램 (KBS 뉴스9, MBC 뉴스데스크, SBS 8시 뉴스)에서 보도된 WBC 뉴스를 분석하여 뉴스프레임을 파악하고자 하였다. 이에 제 1회(2006년), 제 2회(2009년), 제 3회(2013년) WBC 대회의 국가대표팀 출정일부터 해당 WBC 대회의 관련 뉴스가 마지막으로 보도된 날짜까지 지상파 3사 대표 뉴스 프로그램에서 보도된 총 970건의 뉴스를 각 방송사의 뉴스 데이터베이스를 통해 자료를 수집하여 귀납적 분석 방법을 통해 내용 분석을 실시하였다. 그 결과, 총 10개 프레임으로 도출되었고, 도출된 프레임은 첫째, 전달 프레임, 둘째, 반응 프레임, 셋째, 확대 해석/표현 프레임, 넷째, 비교/분석 프레임, 다섯째, 영웅/스타 프레임, 여섯째, 각오/목표 프레임, 일곱째, 준비/전략 프레임, 여덟째, 예측/전망 프레임, 아홉째, 문제인식/개선 프레임, 열 번째, 독려/칭찬 프레임이다. 본 연구를 통해 도출된 10개의 프레임을 토대로 뉴스 제목, 앵커 멘트, 기자 리포트로 분류된 WBC 뉴스를 각각 제목 프레임, 앵커 프레임, 기자 프레임으로 명명하고 프레임 분류 및 양적 특성을 분석하였다. 그 결과, 제목 프레임과 앵커 프레임에서는 전달 프레임, 반응 프레임, 확대 해석/표현 프레임, 비교/분석 프레임이 높은 비율을 보였던 반면, 기자 프레임에서는 각 프레임별로 고른 비율로 분포되었다. The purpose of this study was to find out WBC"s news frame through analyzing the WBC news reported in the three major national terrestrial broadcasters" representative news program. The study was conducted by content analysis using an inductive method on 970 news collected from news database system of each broadcaster. As a result, 10 different frames were drawn from it and those are as follows. The first frame is a delivery frame; the second frame is a response frame; the third frame is a broad interpretation/ expression frame; the fourth frame is a comparison/analysis frame; the fifth frame is a hero/star frame; the sixth frame is a resolution/goal frame; the seventh frame is a preparation/strategy frame; the eighth frame is a prediction/prospect frame; the ninth frame is a problem recognition/betterment frame; the tenth frame is a encouragement/compliment frame. After that, the news classified as news title, anchor"s speech and reporter"s report named as title frame, anchor"s frame and reporter"s frame were analyzed to understand quantitative capabilities based on those frames. Consequently, a delivery frame, a response frame, a broad interpretation/expression frame and a comparison/analysis frame were highly rated on title frame and anchor"s frame. On the other hand, the frames were evenly distributed on reporter"s frame.
손기혁(Kihyuk Son),옥창수(Chang-Soo Ok) 한국산업경영시스템학회 2013 한국산업경영시스템학회지 Vol.36 No.1
In ubiquitous computing, shared environments adjust themselves so that all users in the environments are satisfied as possible. Inevitably, some of users sacrifice their satisfactions while the shared environments maximize the sum of all users ' satisfa ctions. In our previous work, we have proposed social welfare functions to avoid a situation which some users in the system face the worst setting of environments. In this work, we consider a more direct approach which is a preference based clustering to handle this issue. In this approach, first, we categorize all users into several subgroups in which users have similar tastes to environmental parameters based on their preference information. Second, we assign the subgroups into different time or space of the shared environments. Finally, each shared environments can be adjusted to maximize satisfactions of each subgroup and consequently the optimal of overall system can be achieved. We demonstrate the effectiveness of our approach with a numerical analysis.
손기혁(Ki Hyouk Son),김영래(Young Rae Kim),차병호(Byoung Ho Cha),이준수(Jun Su Lee),고창준(Chang Jun Coe) 대한소아신경학회 1995 대한소아신경학회지 Vol.2 No.2
The 50 cases of patients with epilepsy in sibling visited to Department of Pediatrics. College of Midicine, Yonsei University during 7 years from January 1987 March 1994 were reviewed on the basis of clinical charicteristics. The results were summerized as follows : 1) The age distribution were : 1 case(2%) under 1year, 14 cases(28%) from 1 to 5 years, 20 cases(40%) from 5 to 10 years, 15 cases(30%) from 10 to 15 years. Sex distribution revealed males to females to be 1.1:1. 2) The type and incidence of seizure were generalized seizure (52%), partial seizure(48%). 3) The type and incidence of seizure were generalized seizure (52%), partial seizure(48%). 3) The 13 patients had same type of epilepsy in sibling. 4) The 7 patients had the febrile convulsion history. 5) The 15 patients were combined with mental retardation. 6) Associated diseases were : 4 cases with Lennox-Gastaut syndrome, 3 cases with incontinentia pigmenti, 2 cases with DeLange syndrome, 2 cases with tuberous sclerosis, 2 cases with microcephaly, 2 cases with cerebral palsy, 1 cases with cerebromalacia.
손기혁(Ki-Hyuk Son),전영호(Young-Ho Chun),옥창수(Chang-Soo Ok) 한국산업경영시스템학회 2013 한국산업경영시스템학회지 Vol.36 No.4
Estimation approaches for casual relation model with high-order factors have strict restrictions or limits. In the case of ML (Maximum Likelihood), a strong assumption which data must show a normal distribution is required and factors of exponentiation is impossible due to the uncertainty of factors. To overcome this limitation many PLS (Partial Least Squares) approaches are introduced to estimate the structural equation model including high-order factors. However, it is possible to yield biased estimates if there are some differences in the number of measurement variables connected to each latent variable. In addition, any approach does not exist to deal with general cases not having any measurement variable of high-order factors. This study compare several approaches including the repeated measures approach which are used to estimate the casual relation model including high-order factors by using PLS (Partial Least Squares), and suggest the best estimation approach. In other words, the study proposes the best approach through the research on the existing studies related to the casual relation model including high-order factors by using PLS and approach comparison using a virtual model.
무선인터넷 서비스의 CRM 구현을 위한 평가 요소추출에 관한 연구
全永鎬,孫基爀,金明敎 弘益大學校 科學技術硏究所 2004 科學技術硏究論文集 Vol.15 No.-
According to the realization and commercialization of wireless internet, wireless data communication has been recognized as an important client channel and the CRM (Customer Relationship Management) has emerged as the latest issue for the final increase of income by the improvement of customer relationship. Accordingly, this study is to extract the factors of customer satisfaction from the contents properties provided by wireless internet service and investigate how to realize the ultimate CRM and the influences of each property for customer satisfaction by classification of contents quality, information expression, search, sense touch and system quality. As the result of this study, the contents properties provided by the wireless internet service give the influences on customer satisfaction as the influential factors. In conclusion, the data studied in this paper will be used to promote the customer satisfaction of the wireless internet service providers in their product development and enable the statistical application in evaluation of service quality to increase the sales volume and the related income creation as expected.