전국적 경지정리사업과 타이어공업의 전망

신대식,Sin, Dae-Sik 대한타이어공업협회 1969 타이어 고무 Vol.23 No.-

분지관 혼합기의 난류 혼합에 대한 유동 가시화 연구(I)

김경천,신대식,이부환,Kim, Gyeong-Cheon,Sin, Dae-Sik,Lee, Bu-Hwan 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.1

An experimental study has been carried out to obtain optimal conditions for turbulent mixing of two fluid streams at various angle branches by a flow visualization method. The main purpose of this study is the utilization of flow visualization method as a fast and efficient way to find the optimal mixing conditions when several flow control parameters are superimposed. It is verified that the optimal conditions estimated by flow visualization method have good agreement with the concentration field measurements. The results demonstrate that the diameter ratio is mainly attributed to the mixing phenomena than the branch pipe angle and the Reynolds number. The most striking fact is that there exists the best diameter ratio, d/D.ident. O.17, which requires the minimum momentum ratio in the range of the present experiment. The velocity ratio for the optimal mixing condition has a value within 2 to 16 according to the different flow parameters.

분지관 혼합기의 난류혼합에 대한 유동가시화 연구 (II)

김경천,신대식,Kim, Gyeong-Cheon,Sin, Dae-Sik 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.7

Various vortical structures are investigated by using three kinds of flow visualization methods in branch pipe flows. There are two typical flow patterns when a jet from the branch pipe with various angles is injected to the main pipe cross flow. The velocity range of cross flow of the main pipe is 0.2 m/s ~ 1.2 m/s and the corresponding Reynolds number, R$_{p}$ is of the range 1.5 * 10$^{3}$ ~ 9.02 * 10$^{3}$. The velocity ratio(R), jet velocity/cross flow velocity, is chosen from 1.3 to 4. The subsequent behavior and development of the ring vortices which are created at the jet boundary mainly depend on the velocity ratio. An empirical relation for the shedding frequency of the ring vortices is derived. It is also found that there are two different vortex shedding mechanism in the mixing of two fluid streams.s.

파이프유동장에 분사되는 제트의 유동특성 연구

김경천,신대식,Kim, Gyeong-Cheon,Sin, Dae-Sik 대한기계학회 1998 大韓機械學會論文集B Vol.22 No.7

In the fully developed pipe flow, when jet is injected in cross to the flow there are complex transition flows caused by interaction of the cross flow and jet. These interactions are studied by means of the flow visualization methods and frequency analysis using a hot-wire anemometer. The velocity range of cross flow of the pipe is 0.3 m/s ~ 1.2 m/s and the corresponding Reynolds number, R$\sub$p/, based on the pipe diameter is 2.25 * 10$\^$3/ ~ 9.02 * 10$\^$3/. The velocity ratio (R), jet velocity/cross flow velocity, is chosen from 2 to 10. A circular cylinder is placed in the pipe instead of jet to observe the vortex shedding from the solid body. To compare the jet and circular cylinder flow, the vortical structure is analyzed in both cases and the structure of vortices and the origin of its formation are investigated, especially. The vortex shedding of the dominant coherent structure is compared between the jet flow and the circular cylinder flow. In the case of the jet flow, the Strouhal numbers are different depending on the existence of the upright vortex as well as the velocity ratio (R).

열전도성 플라스틱을 이용한 김치냉장고용 열교환기에 관한 연구

강태호,백정용,권용하,김인관,김영수,신대식,박재홍,Kang Tae-Ho,Baek Jong-Yong,Kwon Yong-Ha,Kim In-Kwan,Kim Young-Soo,Sin Dae-Sik,Park Jae-Hong 한국마린엔지니어링학회 2005 한국마린엔지니어링학회지 Vol.29 No.4

The kimchi refrigerator is the electric home appliance which is used for the maturing and preserving of the kimchi in domestic and foreign market. The kimchi refrigerator is composed in 3 main parts as insulation. kimchi container, machinery room. The heat exchanger of kimchi refrigerator is made of aluminum and the other parts are made of steel and polymer. Also, kimchi refrigerator is expensive and heavy as compared with same class of refrigerator until now. In the present study, the possibility to replace heat exchanger from aluminum to thermal conductive plastic was analyzed and experimented. The thermal conductive plastic has $10{\sim}100$ times heat conductivity than that of normal plastic. It is known that heat transfer process is dependent not only conduction but convection or radiation. Thermal conductivity of the applied material in this research is over than 2 W/mK, thermal conductivity doesn't play a vital role on heat transfer. In this study, temperature is the most important parameter on the kimchi refrigerator and the temperature of kimchi refrigerator's heat exchanger was measured and compared with the temperature calibrated by CFD analysis on the inside wall of the kimchi refrigerator. It is important to keep constantly the inside temperature of the Kimchi refrigerator. Besides numerical analyses for the new thermal conductive plastic for heat exchanger were executed with the various height of evaporation tube. A series of experiments were conducted to compare the performance of the two heat exchanger made of aluminum and thermal conductive plastic at the same condition and certified the possibility of the thermal conductive plastic. According to these results, it was confirmed that the conventional aluminium heat exchanger can be replaced by thermal conductive plastic successfully.

예술활동의 사회적 인식변화를 위한 의미 탐색

서상규(Sang-Gyu Seo),오광석(Kwang-Suk Oh),신대식(Dae-Sik Sin),홍세희(Sea-Hee Hong),성건제(Gun-Jae Sung),정하니(Ha-Ni Jung) 한국엔터테인먼트산업학회 2019 한국엔터테인먼트산업학회논문지 Vol.13 No.5

이 연구는 연기와 예술에 대한 사회적 의미와 시대적 변화에 따른 인식의 변화를 지적하고자 하였다. 연구방법은 문헌조사를 통한 질적 연구로 이루어졌다. 이 연구에서 검토한 내용들을 토대로 다음과 같은 내용으로 결론을 대신하고자 한다. 연기란 개인의 삶과 직접적으로 연결된 예술이다. 따라서 개인의 생활은 연기를 통해 살아가면서 자신의 삶을 예술로 승화시키는 활동이다. 우리기 일상생활에서 행하는 모든 활동이 곧 연기이며, 이는 자신의 재능과 직결되어 있다. 즉, 재능 있는 사람은 훌륭한 배우로 인정받고, 재능이 부족한 사람은 엑스트라의 역할을 하는 것과 마찬가지이다. 그러나 재능은 노력에 의해 영향을 받고, 주어진 환경에 의해서도 영향을 받는다. 즉, 개인의 재능은 고정된 것이 아니라 상황에 따라 변화될 수 있다는 것이다. 이러한 개인의 재능에 대한 변화가능성을 다루는 영역이 교육이다. 교육은 다양한 방식으로 운영되고 있으나 연기와 관련해서는 오랜 기간 동안 도제교육 중심으로 이루어져 온 경향이 있었다. 그러나 20세기 접어들면서 서서히 시스템이 갖추어지기 시작하였으며, 최근에는 나라마다 다른 교육시스템을 갖추는 상황으로까지 발전하고 있다. 따라서 일상적인 교육의 과정에서도 연기와 예술이 자연스럽게 적용되어 생활 속에서 접목할 수 있도록 다양한 교육프로그램의 개발과 운영에 대한 실천이 요구된다고 하겠다. This study aimed to point out the social meaning of acting and art and the change of perception according to the time change. The research method was based on qualitative research through literature review. Based on the findings of this study, the following conclusions should be made. Acting is an art directly linked to the life of an individual. Therefore, the life of an individual is an activity that sublimates his or her life into art through acting. Every activity that we do in our daily life is acting, which is directly related to our talents. In other words, a talented person is recognized as a good actor, and a person with a lack of talent plays the role of an extra person. However, talent is influenced by effort and is also influenced by a given environment. That is, an individual"s talent is not fixed but can be changed according to the situation. Education is the area that deals with the possibility of changing these talents. Education has been operating in a variety of ways, but with regard to acting, it has long been centered on apprenticeship education. However, as the 20th century began, systems gradually began to emerge, and in recent years, countries have developed into different educational systems. Therefore, it is necessary to practice the development and operation of various education programs so that the acting and the art are naturally applied in everyday education process and can be applied in daily life.

家兎及人體寄生肝吸蟲 各種抗原에 依한 皮膚反應과 沈降反應의 比較實驗

崔東翊,申大植,金正浣,金正萬 慶北大學校 醫科大學 1963 慶北醫大誌 Vol.4 No.1

The alkali & acid soluble protein fractions and Polysaccharide fractions from the adult Clonorchis sinensis of rabbit and man were employing the identical method, and further study was carried out in the skin and precipitin reaction in order to determine the best antigen among the fraction. The results observed are summarized as follow: Ⅰ.Skin reaction 1)There is no significant difference in positive rate and reactivity between man and experimental rabbit's alkali soluble protein fraction and acid soluble protein fraction. 2)In the polysaccharide fraction, the positive rate of antigen fractionated from man's Clonorchis sinensis is higher than antigen from rabbit. 3)The positive rate of antigen fractionated from man's Clonorchis sinensis is 47.5%(38 cases among 80), whereas from antigen of rabbit, it is 6.1%(5 cases among 82) in the polysaccharide fraction remained acid media. Ⅱ.Precipitin reaction 1)No apparent differences are observed in the titres of precipitin reactons fractionated from the alkali soluble protein & polysaccharide fraction, and also from the acid soluble protein and polysaccharide fraction of man and rabbit Clonorchis sinensis. 2)The titre of precipitin reaction is higher in the polysaccharide fraction in the case of serum of human patient, while it is higher in the protein fraction in the cases of rabbit serum.

家兎及人體寄生肝吸蟲 各種抗源에 依한 皮膚反應과 沈降反應의 比較實驗

崔東翊,申大植,金正浣,金正萬 慶北大學校 醫科大學 1963 慶北醫大雜誌 Vol.4 No.1