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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.
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.
김진용(Jinyong Kim),권태하(Taeha Kwon),이원복(Wonbok Lee),조원만(Wonman Cho),이방업(Bangeop Lee),정규동(Gyoodong Jung),이영우(Youngwoo Rhee) 한국추진공학회 2014 한국추진공학회 학술대회논문집 Vol.2014 No.12
이중펄스 로켓모타는 두 개의 펄스모타 사이에 격벽 또는 격막을 통하여 1단 펄스모타 연소 후 2단 펄스모타가 연소하는 방식으로 일회성 추력 방식이 아닌 효율적으로 이중추력을 조절한다. 이러한 추력 배분을 통하여 사거리와 종말속도를 증가시켜 미사일의 기동성 및 사거리를 향상시킨다. 본 연구에서는 격막 펄스분리장치를 full scale 이중펄스모타에 설계하였으며 지상연소시험을 통하여 분석하였고, 결과적으로 펄스분리장치의 파열 특성을 파악할 수 있었다. Dual pulse rocket motor(DPRM) has a rocket motor with different pulse grains divided by a pulse separation device(PSD) such as a fragile bulkhead or a thermal barrier type. It distributes thrust energy very effectively via pulse separation device to improve range and terminal velocity of a missile. This paper contains the thermal barrier design and experimental analysis through ground firing tests of full scale DPRM. The results showed good understanding of the characteristics of the PSD.
김진용(Jinyong Kim),권태하(Taeha Kwon),이원복(Wonbok Lee),조원만(Wonman Cho),이방업(Bangeop Lee),정규동(Gyoodong Jung),이영우(Youngwoo Rhee) 한국추진공학회 2013 한국추진공학회 학술대회논문집 Vol.2013 No.12
이중펄스 로켓모타는 두 개의 펄스모타 사이에 격벽 또는 격막을 통하여 1단 펄스모타 연소 후 2단 펄스모타가 연소하는 방식으로 일회성 추력 방식이 아닌 효율적으로 이중추력을 조절한다. 이러한 추력 배분을 통하여 사거리와 종말속도를 증가시켜 미사일의 기동성 및 사거리를 향상시킨다. 본 연구에서는 격막 펄스분리장치를 직경 000mm급 이중펄스모타에 설계하였으며 지상연소시험을 통하여 분석하였다. Dual pulse rocket motor has a rocket motor with different pulse grains divided by a pulse separation device such as a fragile bulkhead or a thermal barrier type. It distributes thrust energy very effectively via pulse separation device to improve range and terminal velocity of a missile. This paper contains the thermal barrier design and experimental analysis through ground firing tests of 000 mm diameter dual pulse motors.
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),권태하(Taeha Kwon),이원복(Wonbok Lee),윤남균(Namgyun Yun),이영우(Youngwoo Rhee) 한국추진공학회 2012 한국추진공학회 학술대회논문집 Vol.2012 No.11
연구에서는 높은 강도의 가스흐름으로부터 추진기관 연소실 내부를 보호하기 위하여 유리직물을 삽입한 EPDM계 내열재를 제작하였으며 성능시험을 수행하였다. 내열재는 제작하는 과정 중에 유리직물과 EPDM의 층간 접착력을 향상시키기 위하여 Chemlok<SUP>ⓡ</SUP>을 도포하였다. 내열재의 성능을 시험하기 위하여 6-inch 시험모타에 extension tube를 연결하였고, 모타와 extension tube 사이에 유동구멍이 있는 FRP를 삽입하여 추진제 연소시 높은 강도의 가스흐름을 유도하였다. 결과적으로 접착제를 도포한 유리직물/EPDM 내열재의 삭마량은 다른 내열재에 비해 감소되는 것으로 분석되었다. This paper presents manufacturing process and performance test of the glass fabric/EPDM insulation to protect motor case from high volumetric gas flow. Chemlok<SUP>ⓡ</SUP> used to improve adhesion between the glass fabric and EPDM. Six-inch simulation motor connected with extension tube was designed to test of insulation materials. High volumetric gas flow was induced by FRP disc with hole between motor and extension tube. As a results, ablation rate of glass fabric/EPDM insulation applied adhesive was decreased compared to another insulations after ground static test.