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A translation of an analogue of Wiener space with its applications on their product spaces
조동현 대한수학회 2022 대한수학회논문집 Vol.37 No.3
Let $C[0,T]$ denote an analogue of Weiner space, the space of real-valued continuous on $[0,T]$. In this paper, we investigate the translation of time interval $[0,T]$ defining the analogue of Winer space $C[0,T]$. As applications of the result, we derive various relationships between the analogue of Wiener space and its product spaces. Finally, we express the analogue of Wiener measures on $C[0,T]$ as the analogue of Wiener measures on $C[0,s]$ and $C[s,T]$ with $0<s<T$.
조동현,이종선,Cho, Dong-Hyun,Lee, Jong-Sun The Korean Society of Manufacturing Process Engine 2017 한국기계가공학회지 Vol.16 No.4
In the present study, we used a loop thermosyphon heat exchanger consisting of condensers with internal fins and external plate fins which are 480 mm wide, 68 mm long, and 1,000 mm high. The heat transfer pipes in the heat exchanger were 15 mm in diameter and 1,000 mm in length, and 98 heat transfer pipes were installed in the heat exchanger. According to the experimental results, as the spaces between the internal discontinuous pins decreased, the frequency of pressure drops increased and changes in temperature at the outlet of the condenser were shown to be a little smaller. Therefore, we can see that as the spaces between internal discontinuous pins decreased, the heat transfer performance increased. For the loop heat pipe heat exchanger consisting of a condenser with internal and plate fins, as the temperature of the air flowing into the condenser increased, the condensation heat transfer rate also increased, and as the condenser refrigerant inflow temperature increased, the condensation heat transfer rate increased as well.
요구조건 기준의 개발 수행을 위한 우주발사체 개발사업의 실제적인 요구조건-검증 관리 체계
조동현,장준혁,유일상 한국시스템엔지니어링학회 2023 시스템엔지니어링학술지 Vol.19 No.1
For the success of system development, it is necessary to systematically manage the requirements that are the basis of system development and its verification results. In order to follow the principles of SE(Systems Engineering)-based V&V(Verification&Validation) process, requirements can be managed by securing the requirements and their establishments, design compliances, and verification compliances according to the system development lifecycle. Especially, in a large-complex system research and development project, such as a space launch vehicle development project, many participants establish, verify, and validate numerous requirements together during the project. Therefore, logical and systematic requirements management, including guarantee of data integrity, change history, and traceability, is very important for multiple participants to utilize numerous requirements together without errors. This paper introduces the practical requirements and verification management for the requirements-based development process in the space launch vehicle development project.
조동현,방효충 한국항공우주학회 2011 한국항공우주학회 학술발표회 논문집 Vol.2011 No.4
달 착륙선의 연료소모를 최소화하기 위한 최적의 달착륙 궤적 설계에 대한 연구가 많이 이루어졌다. 하지만 이러한 연구들은 대부분 최종 착륙단계에서 착륙선의 착륙각도를 고려하지 않고, 이러한 착륙선의 착륙각도를 위한 별도의 하위 임무단계를 설정하고 있다. 이러한 문제를 해결하기 위해 최종착륙시점의 착륙선의 자세각을 고려하고자 하는 노력들이 있어왔지만, 대부분 자세 운동방정식을 이용함으로 인해 최적화를 위한 성능함수를 서로 다른 물리량을 이용해서 표현하고 있다. 따라서 이러한 두 물리량 사이의 척도인자의 설정에 따라 다양한 최적궤적이 생성된다. 따라서 본 논문에서는 자세 물리량의 도입없이 최종시점에서의 제어입력에 대한 구속조건을 이용함으로써 최적 착륙궤적을 생성하고자 한다. Recently, researches for the optimal lunar landing trajectory have been pursed in many researchers to reduce the total mass of propellant of the lunar lander. However, in these researches did not consider the vertical landing conditions at the final landing stage. And in the some researches, the equations of angular motion are adopted to find the solution of this vertical lunar landing trajectory. However, using these approaches the optimal solution is depend on the scale factor of cost function because it is consisted of two different mechanical parameters such as a final mass and torque. Therefore, in this paper, we will discuss the optimal solution using the final control constraint for vertical lunar landing instead of the equations of angular motion.
조동현 대진대학교 생산기술연구소 1998 생산기술연구소 논문집 Vol.1 No.-
Low integral-fins tubes and finned tubes with caves are tested. In case of condensation CFC-11 condensates at saturation state of 32℃ on the outside surface cooled by inside cooling water flows. And in case of boiling the refrigerant evaporates at a saturation state of 1 bar on the outside tube surface and heat is supplied by hot water which circulates inside of the tube. The tube having fin density of 1299fpm and 30grooves has the best boiling overall heat transfer coefficient. However, as far as boiling heat transfer coefficient concerns, fin tubes with cave show higher value than low fin tube having fin density of 1299fpm and 30 grooves.
조동현,김진형,김규원,서영거,김정훈 대한약학회 2014 Archives of Pharmacal Research Vol.37 No.3
Angiogenesis-related blindness (ARB) includesage-related macular degeneration, diabetic retinopathy, andretinopathy of prematurity, all of which are based onpathologic angiogenesis. Current treatment options such assurgery, laser photocoagulation, and steroid have shownlimitations because they do not directly resolve the pathologicevents in the retina. Furthermore, recently approvedand developed therapeutic drugs only focus on directinhibition of growth factors and suppression of downstreamsignaling molecules of activated receptor proteins byorthosteric ligands. In this regard, allosteric regulation ofreceptors and ligands can be a valuable mechanism in thedevelopment of novel drugs for ARB. In this review, webriefly address the clinical significance of ARB for furtherdiscussion on allosteric regulation of pathologic angiogenesisfor ARB. Interestingly, key molecules in thepathogenesis of ARB can be targets for allosteric regulation,sharing characteristics as allosteric proteins. Withinvestigation of allostery by introducing well-established models for allosteric proteins and currently published novelallosteric modulators, we discuss the potential of allostericregulation for ARB. In conclusion, we hope that allostericregulation of pathologic angiogenesis in ARB can opennew opportunities for drug development.
담수 이매패의 진주층 형성 - ( Ⅱ. Extrapallial fluid 의 SDS 전기 영동 ) -
조동현,권오길,박성빈 ( Dong Hyun Cho,Oh Kil Kwon,Sung Bin Park ) 한국하천호수학회 1985 생태와 환경 Vol.18 No.3·4
The extrapallial fluid of two species of freshwater bivalves is studied for protein fractions. SDS-slab gel electrophoresis reveals the presence of at least 27 protein components. The insoluble matrices from the shells of Corbicula fluminea and Lanceolaria acrorhyncha are not solubilized by the method for solubilization of the avian feather keratin.
액체산소/등유 사용 우주발사체 월별 발사 현황 (2009년 ~ 2013년)
조동현,유일상,김근택 한국항공우주학회 2014 한국항공우주학회 학술발표회 논문집 Vol.2014 No.11
1957년 (구)소련의 스푸트닉 위성을 시초로 인류는 계속해서 우주발사체를 이용해 인공위성을 우주로 쏘아 올리고 있다. 오늘날 세계 각지에서는 연평균 70회 이상의 우주발사체 발사가 이루어지고 있다. 본 연구는 세계 우주발사체의 월별 발사 현황에 대해 조사하였으며, 특히 최근 5년간(2009년~2013년) 발사 이력을 토대로 계절(기온)이 한국형발사체와 같은 액체산소/등유를 사용하는 우주발사체의 발사에 미치는 영향성을 분석하였다. Today, humankind launches the satellites to space by using space launch vehicles since the Sputnik of the Soviet Union in 1957. Annually, more than 70 space launches are accomplished in the world. This paper investigates the monthly world space launch status: especially for analysing the seasonal(temperature) influence on the space launch vehicles using RP-1/LOX fuel(like KSLV-II) based on the recent 5 years(2009y~2013y) data.