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하이브리드 추진 시스템의 예비 설계 및 성능 예측에 관한 연구
윤창진,송나영,유우준,김진곤,성홍계,문희장,Yoon, Chang-Jin,Song, Na-Young,Yoo, Woo-Jun,Kim, Jin-Kon,Sung, Hong-Gye,Moon, Hee-Jang 한국항공운항학회 2006 한국항공운항학회지 Vol.14 No.4
This paper describes the preliminary design procedure for the hybrid propulsion system. For a given mission defined by velocity increment, the design of a polyethylene/LOX hybrid rocket was implemented. In addition, Seven-cluster multi-port fuel-grain was considered. After determining the system size including the combustion chamber, the performance parameters such as specific impulse, thrust, characteristic velocity, and thrust coefficient can be predicted by using empirical regression rate correlation, though most of preliminary design code assume constant regression rate. The results of the performance prediction indicated that besides the widely used HTPB/LOX, polyethylene/LOX hybrid motor can be a viable alternative to the more widely used SRMs.
스마트시티 챌린지 프로젝트 사례 연구: 수원 스마트시티 New 1794 Project 기반으로
윤창진 ( Yoon Chang Jin ),서응교 ( Seo Eung Kyo ),김태형 ( Kim Tae Hyung ) 한국정보시스템학회 2021 情報시스템硏究 Vol.30 No.2
Purpose The beginning of innovation and creation, Haenggung-dong, Paldal-gu, Suwon-si: Suwon Hwaseong Fortress, which began in 1794 by King Jeongjo in accordance with the spirit of Beopgochangsin, mobilized the abilities of traditional techniques, new science and technology, and artists New starting point for urban innovation in Suwon: Based on 5G technology possessed by leading companies in the global ICT industry in Hwaseong (Haenggung-dong), a product of cutting-edge evidence, solve various urban problems through public, private, industrial and academic governance, and a new business model It aims to reorganize into the space where this is created. Design/methodology/approach The New 1794 Project is a 2019 demonstration project requested by the Ministry of Land, Infrastructure and Transport for “Suwon Smart City Challenge Project: Haenggung-dong, Paldal-gu, Suwon-si,” developed by the Dankook University SW Design Convergence Center, and the main project from 2020 to 2022. The smart city project strategy should be implemented based on partnerships with multiple stakeholders, and the bottom-up approach and the traditional top-down must be able to coexist. Therefore, the smart city solution applied a horizontal governance method. Findings In this study, the definition of the New 1794 Project, which is the key to defining smart cities in relation to all analyzed aspects, was developed.
윤창진 ( Chang Jin Yoon ) 대한간학회 2012 Postgraduate Courses (PG) Vol.2012 No.-
During recent decades, many image-guided procedures for portal hypertension have been developed, and today, interventional radiology has evolved to become an integral part of therapy. Various procedures are currently available, the choice depending on the etiology and location of disease, the pathoanatomy, and the symptomatology. Those procedures can be categorized into two groups. 1) Interventions to reduce the portal pressure by either direct or indirect methods. This can be achieved with transjugular intrahepatic portosystemic shunt (TIPS), recanalization of the hepatic vein outflow, recanalization of the portal vein and its tributaries, partial splenic embolization, and embolization of arterioportal shunts. 2) Interventions to embolize bleeding varices without altering portal pressure. This can be performed percutaneously or transvenously. This article briefly describes the procedures, their results, and their current status in the treatment of portal hypertension.
에르고미터 운동 시 근활성도와 생리학적 피로도 비교 분석
윤창진 ( Chang Jin Yoon ),채원식 ( Woen Sik Chae ),강년주 ( Nyeon Ju Kang ) 한국운동역학회 2010 한국운동역학회지 Vol.20 No.3
The purpose of this study was (a)to compare electromyographic (EMG) activities and physiological variables on the development of fatigue induced by ergometer test, (b)to determine investigate the differences in the stage of fatigue between the electromyographic characteristics and physiological variables. Nine male university students who have no musculoskeletal disorder were recruited as the subjects. The electromyographic characteristics(peak IEMG, average IEMG, median frequency, mean edge frequency) and physiological variables(HR, RPE, blood lactate) were determined for each stage(15, 30, 45, 60 minutes, all out). For each dependent variable, one-way analysis of variance(ANOVA) with repeated measures and correlation analysis were performed to test if significant difference existed(p<.05). The results showed that peak IEMG, average IEMG from low extremity and physiological variables were significantly increased during the all-out stage. EMG parameters in VL, VM show significantly correlation with physiological variables during whole stages. This indicated that IEMG values may be proper parameters to determine muscle fatigue rather than physiological variables.
강병윤(Byung-Yoon Kang),김기년(Ki-Nyun Kim),윤창진(Chang-Jin Yoon) 한국토목섬유학회 2009 한국지반신소재학회 학술발표회 Vol.2009 No.4
In this study is the tide Saemangeum embankment management and sea side slope behavior analysis, and surveillance and management of the numbers 1 and 3 tide embankments installed in each of the previous years was conducted. Results of the numbers 1 and 3 devices showed that sideways movement by the clinometers were slight, and in the case of the subsidence meter, efflux of find wire dredging caused by damage to the filter mats resulted in serious subsidence at the STA. No. 20+30 row 1 EL+3.0m, EL-6.0m, row 2 EL-2.0m points of device number 1. Results of the piezometer showed that changes in the tide levels at low and high tide caused changes in water pressure at regular intervals. Therefore, it is established that tide embankments are stable in all areas save the STA. No. 20+30 point of device number 1.
2011 대구 세계육상선수권 대회에 참가한 한국 남자 창던지기 선수와 입상자들의 3차원 운동학적 비교 분석
채원식 ( Woen Sik Chae ),윤창진 ( Chang Jin Yoon ),임영태 ( Young Tae Kim ),이행섭 ( Haeng Seob Lee ),김동수 ( Dong Soo Kim ) 한국운동역학회 2011 한국운동역학회지 Vol.21 No.5
The purpose of this study was to compare selected kinematic variables between male medalists and a Korean male javelin thrower at the IAAF World Championships, Daegu 2011. The three medalists and one Korean javelin thrower that participated in the Championships were videotaped using three high-speed cameras (300 frames/s, EX-F1 Exilim, Casio, Japan), The results showed that the release and attitude angles of the Korean male javelin thrower (KMJT) were greater than that of the medalists, whereas the attack angle of the KMJT was smaller than that of the medalists. This study also found that the KMJT clearly had a lower release height than the medalists. As a possible adaptation of his physique to the skill, the KMJT used a small trunk inclination angle and produced greater inclination angles at his upper extremities. These results may be linked to an increase in the release angle of the KMJT. There were some difference between the KMJT and the medalists in terms of the length and duration of the delivery phase. In harmony with the shorter length of the delivery phase, its duration was shorter for the KMJT in comparison to the medalists. Because the delivery stride is considered to be a primary generator of endpoint speed, this decrease in the delivery phase time would decrease the javelin velocity at release. The amount of time taken in the delivery phase may be a critical factor to enhance a javelin thrower`s performance. Thus, rhythmic movement training specifically designed for the KMJT will help him attain an optimal throwing position.
Multi-port 하이브리드 로켓 연소기에서 고온 산화제 유동에 의한 고체연료의 구조적 안전성에 대한 연구
도규성 ( Gyu Sung Do ),윤창진 ( Chang Jin Yoon ),문희장 ( Hee Jang Moon ),김진곤 ( Jin Kon Kim ) 한국항공운항학회 2007 한국항공운항학회지 Vol.15 No.4
This paper describes the structural safety of solid fuel in the Hybrid Rocket Motor (HRM). Hybrid rocket combustion has the distinct regression characteristics which include the process of thermal pyrolysis and fuel vaporization. Most of all, this regression characteristics would structurally affect the strength of the fuel having a multi-port configuration, and even may cause the breaking from the fuel grain. This problem would probably influence the performance and operating safety of HRM. Therefore, for the safe operation of HRM, the critical port radius which determines the structurally safe region was discussed from the heat analysis of the solid fuel.