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이중펄스 로켓모타의 격막형 펄스분리장치 설계 및 성능평가
김진용,권태하,이원복,조원만,이방업,정규동,이영우,Kim, Jinyong,Kwon, Taeha,Lee, Wonbok,Cho, Wonman,Lee, Bangeop,Jung, Gyoodong,Rhee, Youngwoo 한국군사과학기술학회 2015 한국군사과학기술학회지 Vol.18 No.1
The dual pulse rocket motor(DPRM) distributes the propellant energy effectively via pulse separation device(PSD) to improve the range and terminal velocity of the missile. There are two types of PSD such as bulk head type and thermal barrier type. A subscale thermal barrier type DPRM was designed, manufactured, and tested. The results showed good understanding of the characteristics of the PSD and will be applied to the design of the full scale DPRM.
자산가격모형 평가에 있어서의 효율적 모방 포트폴리오 방법
김진용 ( Jinyong Kim ),김건호 ( Kun Ho Kim ),이정환 ( Jeong Hwan Lee ) 한국경제학회 2021 The Korean Economic Review Vol.37 No.2
횡단면 회귀분석 및 모방 포트폴리오 방법을 이용한 기존의 자산가격모형 성과 평가 과정에서는 모형 요인의 리스크 프리미엄이 테스트 자산만의 포트폴리오로 추정됨에 따라 자유도가 감소되어 통계적 검정이 이루어진다. 모형 요인이 수익률 변수인 경우 리스크 프리미엄이 기대수익률과 같다는 추가적인 제약을 부여할 수 있으나, 요인이 비수익률 변수인 경우에는 이러한 제약을 부여할 수 없어 모형의 성과에 대한 완전한 비교 평가가 어려워진다. 본 논문에서는 평가 대상 모형의 위험 요인을 테스트 자산 및 성과기준 모형의 수익률 요인에 의해 생성되는 확장된 수익률 공간에 투영하는 효율적 모방 포트폴리오 방법을 제안한다. 일반화적률법에 의한 모형의 성과 평가에 있어서 효율적 모방 포트폴리오 방법이 검정력을 높이고 기준 모형과의 비교를 보다 공정하게 수행할 수 있음을 보인다. The classic cross-sectional regression (CSR) and mimicking portfolio (MIM) procedures estimate factor risk premia on a test asset span and the resulting tests of asset pricing models are performed with reduced degrees of freedom. Although we can restrict the risk premia of traded factors to equal expected returns, imposing such restrictions on nontraded factors is difficult, which may prevent full performance evaluation. We suggest testing with efficient MIMs that project factors onto a return space spanned by test assets and benchmark traded factors. The generalized method of moments (GMM) tests show that this approach generates more powerful tests and fair comparison against a benchmark model.
Fabric/EPDM계 고무의 제작 공정에 따른 삭마 특성
김진용(Jinyong Kim),노태호(Taeho Rho),이원복(Wonbok Lee),조원만(Wonman Cho),이영우(Youngwoo Rhee) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.5
격벽형 펄스분리장치를 갖는 이중펄스 로켓모타의 경우 2단 모타 추진제 연소시 1단 모타 연소실 내부에 높은 강도의 가스흐름이 발생하므로 1단 모타 연소관 내열재 설계가 중요한 변수들 중의 하나이다. 본 논문에서는 이러한 높은 강도의 가스흐름으로부터 연소실 내부를 보호하기 위하여 fabric을 삽입한 EPDM계 고무의 제작 공정을 확립하였으며 높은 강도의 가스흐름을 유발하도록 설계된 모사모타에 적용하여 삭마 특성을 분석하였다. The dual pulse rocket motor is a pressure vessel containing two pulse grains separated by a pulse separation device such as a fragile bulkhead. One of the important things in this systems is case insulation design using the excellent materials in the 1st stage pulse motor. We investigated manufacturing process of fabric/EPDM chamber insulations in order to protect the 1st stage pulse motor case with high intensity gas flow. Simulation motor connected with extension tube having FRP disc was designed to study ablation characteristics of insulation.
환경문제의 위해도 인식과 위해도 홍보 프로그램의 효과분석-라돈과 다이옥신을 중심으로-
김진용(Jinyong Kim 외 4명),신동천,박성은,임영욱,황만식 환경독성보건학회 2002 환경독성보건학회지 Vol.17 No.4
Risk communication can be defined as the exchange of information about the nature, magnitude, significance, acceptability, and management of risk. The effect of risk communication on the perception and knowledge towards risk of environmental pollutants and it's related factors were investigated in this study.<br/> To investigate perception and knowledge of students and teachers towards risk of environmental pollutants, we conducted the survey using self-administrated questionnaire. The subjects were 574 for the first survey and 465 for the seconds survey from May to June. 2000. The main methods of transmission used in this study through video tape, visual materials, question and answer, and participation in measuring pollutants-were not a one-way street. But an interactive process where information and opinions were exchanged among individuals, groups. and institutions. Environmental pollutants measured with participation of study subjects was Radon in the class room. The concentration of Radon was measured using E-PERM Device by installing it at each site for about 5 days.<br/> Subjects showed much interest in environmental pollution. Also. more than 98% of total subjects were perceived as Korea is seriously contaminated at present. By risk communication activity, risk perception of all subjects about Radon was increased, on the other hand, risk perception of Dioxin was decreased except for elementary student. Moreover. knowledge of all subjects about environmental risk was significantly increased(p=0.0001) and effort of reducing environmental pollution was more increased (p< 0.05).<br/> There is need to further develop, refine, and integrate these approaches environmental risk communication study. there is an even more pressing need to accelerate the diffusion of environmental risk communication practice into government and organizations.
김진용(Jinyong Kim),김재희(Jaehee Kim),김승권(Sheung-Kown Kim) 한국경영과학회 2015 한국경영과학회지 Vol.40 No.2
The valuation of patents is very important, since technology competitiveness is crucial for firms to maintain global competitiveness. But, the patent valuation is difficult and challenging because of the uncertainty affecting their returns. Hence, we propose a patent valuation method by incorporating game theory into the real option model, which can not only potentially recognizes the effect of uncertainty on patent value, but also consider investment decision in a competitive market, as a game between firms. With the model, we can consider dynamic strategy involving an option of patent leveraging strategies enabling the firm to switch among compete, cooperate, or wait modes under different demand or competitive advantage condition.
고체 추진기관 적용 EPDM/Kevlar 조성의 접착형 내열 튜브 개발
김진용(Jinyong Kim),이원복(Wonbok Lee),서혁(Hyuk Suh),한철희(Cheolhee Han) 한국추진공학회 2008 한국추진공학회 학술대회논문집 Vol.2008 No.5
본 연구는 고체 추진기관에 적용되는 내열재를 autoclave 방식이 아닌 hot press molding으로 제작하여 연소관에 접착 가능한 상태의 내열재로 제작하는데 초점을 두고 있다. EPDM/kevlar를 기본 조성으로 내열재 원료가 구성되고, 미가류 sheet 상태로 공급된다. 전방 내열재는 금형을 사용하여 preform 상태로 1차 제작하고, boots를 구형하기 위해 두개의 preform 사이에 modified nylon film을 사용하여 제작 하였다. 실린더 부위를 포함하고 있는 후방 내열재는 특별히 설계된 하나의 금형으로 제작되었고, boots 부위는 초경합금 칼날을 가지고 있는 장비에 의해 실현되었다. In this study, we focused on development of the adhesive insulator using the case for solid rocket motors. Material of insulator used unvulcanized rubber based on EPDM/kevlar. In case of front insulator, preforms was made by using hot press molding, and then modified nylon film was inserted between two preforms for boots manufacturing. Rear insulator included cylinder part was embodied by only one mold with special designed and manufactured shape in the process. Boots part of rear insulator was obtained by cutting machine with hard-metal cemented carbide.