냉각 Cycle Matching을 위한 핀-관 열교환기의 설계 Program 개발

김재열,마상동,최충현 조선대학교 에너지.자원신기술연구소 1997 에너지·자원신기술연구소 논문지 Vol.19 No.2

The purpose of this study is to develop the optimum design program of air cooled fin-tube heat exchanger. Logarithmic mean temperature difference(LMTD) method which is generally acceptable is used to design the air cooled fin-tube heat exchanger. In the coventional heat exchanger design by LMTD method, heat transfer, overall heat exchanger coefficient, and heat exchanger area are calculated by using the inlet and outlet temperature of heat exchanger. The design for the two phase flow in the tube of heat exchanger can be applied to the design of considers by LMTD method. A performance comparison according to the different refrigerants is provided using R-134a and R-12. As the result of this study, total heat transfer rate of heat exchanger using R-134a were found higher than that of using R-12 for the same operating conditions.

고층아파트 수퍼그래픽의 조형성에 관한 연구 : 성서아파트 단지를 중심으로

高在烈 영남이공대학 1999 論文集 Vol.28 No.-

The rapid industrial development has led to the construction of numerous skyscrapers in the different cities leading to traffic congestion and the concentration of the population in urban areas. The concentration of the population in urban areas and its continued expansion is typical characteristic of contemporary society yet it is a serious problem. The modernization and industrialization of Korean society based on the Economic Development Plan in the 1960s to 1970s brought about the rapid concentration of the population in urban areas. The collective housing which is a high-density residential housing style similar to an apartment appered to have helped in easing the severe housing shortage problem caused by the toward nuclear families. In particular, the idea of Housing Complex become a primary factor in the conceptualization of the Multi-story Apartment Plan which led to an increase in the number of apartment complexes and also contributed to the New-City Development that started in 1990. Although collective housing plays a good role as a new residential space providing economy and convenience to modem urban living, the current trend in the construction of apartments only focuses on the commercial aspect and this has led to several serious problem such as monotonous uniform modeling and arrangement as a result of mass supply, unplanned painting, lack of color sense and lack of understanding among regidents and local people about the features of plastic art based on supergraphic design. For the above-mentioned problem, various methods and efforts to improve the urban environment have led to gloomy, disorganized and confusing problem. I request that the supergraphic design of multi-story apartment buildings be recognized as a factor for restructuring the urban environment to make it more pleasant. Therefore, the purposes of this study are the provide basic data which can be used as a guideline for planning supergraphic design, for preparing the genera: ideas and the basis required primarily to improve the visual environmental of apartment complexes which are getting bigger and higher, to analyze the supergraphic modeling of the side walls of apartment buildings starting from the Seongsoe multi-story apartment district: to overcome the uniform image of multi-story apartment complexes and to create variety in the visual environment of apartment complexes.

디지털시대의 시각디자인 환경 변화에 관한 소고

高在烈 영남이공대학 2002 論文集 Vol.31 No.-

The world is changing into the digital era. Digitalization technology is leading the times thus changing the world. After the industrial revolution, the society underwent the era of machine-based production, knowledge and informationbased era, and has developed and changed through digitalization technology. In this changing paradigm of the times, design should likewise reflect new society paradigms. The change in visual communication design environment and industrial structure that have been maintained in the analogue age should be readjusted to the new digital social structure. The frame of design industry structure is changing to the system of design industries with Professionalism and technologies on software, media and vidual industry. The visual design environment in this digital age promotes the change in design and processes, calls for changes in social, cultural and corporate environment, and eventually changes the entire design industry. This digital design environment can be created by nmrpting the operation and change of tools handling digital media, and calls for the understanding on the information system of simultaneously integrating all elements. and for understanding and Imowledge on the design system of simultaneously communicating with all elements with network contents. Thus, this study sought to realistically reestablish the position of visual design in the new digital environment, present its development model, and form new paradigms in the digital age.

진행성파괴를 고려한 보강모래지반의 지지력에 관한 연구

임종철,이재열,홍석우 釜山大學校生産技術硏究所 1998 生産技術硏究所論文集 Vol.55 No.-

지지력에 관한 이론들이 조밀한 모래지반에서 동시파괴(전반전단파괴)가 발생한다고 가정하고 있다. 그러나, 본 논문에서 실시한 모형실험의 결과 조밀한 모래지반이라도 진행성파괴가 발생한다는 것을 알 수 있으므로, 지지력산정시 동시파괴에 의한 지지력계수가 아닌 진행성이 고려된 지지력계수를 사용하는 것이 중요하다. 본 연구결과에 의하면, 매트로 보강된 모래지반의 경우 근입깊이의 증가로 인해 지지력이 증가되는 요인과 흙과 매트의 마찰저항에 의해 지지력이 증가되는 효과 또한 지지력산정시 고려되어져야 한다. 그리고, 제안된 방법에 의해 계산된 값과 모형실험에 의한 결과를 비교하였다. In most of the theories about bearing capacit of footing, it is assumed that the general shear failure occurs in dense sandy ground. But, according to the test results of this study, progressive failure occurs in dense sandy ground also. So, in order to calculate bearing capacity, it is important to sue bearing capacity factor in which progressive failure is considered. By the results of this study, it is known that the effects of bedding depth and friction between soil and mat should be considered to get a bearing capacity of footing on the sandy ground reinforced by mat. And bearing capacity calculated by proposed method and test results are compared.

위장관 향도잡이 세포

최석,전제열 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1

The interstitial cells of Cajal (ICC) have functions of pacemaker cells in gastrointestinal (GI) tract and neuromediator cells in the tunica musculahs of the GI tract. The ICC generate the rhythmic oscillations in membrane potential known as slow wave potentials and this generation of slow wave potentials is due to spontaneous inward currents called pacemaker currents. Although the exact mechanisms about these events still unclear, many reports suggested that the activation of non-selective K^(+) channels, Cl^(-) channel, and spontaneous intracellular Ca^(2+) activities in ICC involve the producing of pacemaker activity. Also, it is well known that many endogenous agents such as neurotransmitters, hormones, and paracrine substances modulate GI tract motility by influencing ICC.

햄스터에서 camostat mesilate와 proglumide가 담즙구성 성분에 미치는 영양

송영진,김성열,이상전,윤효영,장이찬,최재운 충북대학교 의과대학 충북대학교 의학연구소 1995 忠北醫大學術誌 Vol.5 No.1

콜레스테롤 담석 생성 기전을 보면 콜레스테롤이 담즙산이나 인지질에 비해 과포화되어 담석이 형성되는 것으로 알려져 있다. 색소성 담석도 CCK의 분비저하와 연관이 있는 것으로 생각되고 있으나 담즙 구성 성분의 농축과 연관이 있는 지는 알려져 있지는 않다. Kim등의 실험에서 콜레시스토기닌이 항진되어 담즙 구성 성분이 희석되었다. 만약 콜레시스토키닌 분비를 감소시킨다면 담즙 구성 성분이 농축될지는 알려져 있지 않다. 콜레시스토키닌 분비의 증감에 따라 담즙 구성 성분이 희석, 농축된다면 콜레시스토키닌과 담즙 구성 성분은 유기적으로 작용한다고 생각되어 질 수 있다 이에 저자들은 콜레시스토키닌 분비를 억제하고, 항진시키면 담즙의 구성 성분이 농축되고, 희석될 것이라는 가설을 설정하였고, 콜레시스토키닌 분비 길항제로 알려진 proglumide와 콜레시스토키닌 항진제인 camostat mesilate를 햄스터에서 투여하여 담즙구성 성분의 변화를 살펴보고자 하였다. 햄스터 80마리를 크게 4군으로 나누어 비슷한 체중을 보이는 햄스터를 짝을 지어 쥐장 1개에 4마리씩 넣어 키웠다. I군(n=20)에서는 고탄수화물식을 Ⅱ군(n=20)은 1% proglumide를 함유한 고탄수화물식이를 Ⅲ군(n=20)은 0.2% camost mesilate를 함유한 고탄수화물식이를 Ⅳ군(n=20)은 1% proglumide와 0.2% camostat mesilate를 함유한 고탄수화물식이를 2주간 투여하였다. 실험시작 2주후 24시간 금식을 시킨후 동물을 희생시켰다. 담당에서 담즙을 채취하여 구성성분을 분석하였다. 사료소모량과 체중 증가는 Ⅱ군에서 가장 높았고 Ⅲ군에서 가장 낮았다(p value=0.003). 담즙 구성 성분중 총빌리루빈, 인지질은 Ⅱ군에서 가장 높았고 Ⅲ군에서 가장 낮았다(p value=0.02, 0.03). 콜레스테롤은 Ⅱ군에서 가장 높았고 Ⅲ군에서 가장 낮았지만 통계적 유의성은 없었다(p value=0.1). 담즙산은 대조군에서 가장 높았고, Ⅲ군에서 가장 낮았다(p value=0.06). 콜레시스토키닌분비 항진제와 길항제의 투여에 따라 담즙구성 성분중 총빌리루빈치와 인지질, 콜레스테롤은 희석되고 농축되었다. 이는 콜레시스토키닌의 분비 증감에 기인하는 것으로 추정되며 처음에 설정된 가설이 일부분 증명된 것이라고 생각된다. 담즙산이 proglumide를 투여한 군에서 대조군에 비해 낮은 것은 이 약제의 용량이 적었기 때문인 것으로 추정된다. Comostat mesilate를 투여한 Ⅲ군에서 사료소모량이 감소한 것은 콜레시스토키닌의 혈중농도가 상승했기 때문인 것으로 생각된다. It has been suggested that pigment stone formation is associated with decreased secretion of cholecystokinin. It has not defined yet for decreased secretion of cholecystokinin to concentrate bile composition will be diluted if cholecystokinin increase by camostat mesilate and if bile composition will be concentrated if cholecystokinin decrease by proglumide. The present study was undertaken to define the effect in dile composition after ingestion of proglumide and camostat mesilate in hamsters. Eighty hamsters were divided into 4 groups : Group I Fed high carbohydrate diet and libitum, Group Ⅱ fed high carbohydrate diet and 1% proglumide. Group Ⅲ fed high carbohydrate and 0.2% camostat mesilate diet for 2 weeks. Hamsters was sacrificed at 3rd week. GB bile was aspirated and gallbladdder bile was analysed by kits. The level of total bilirubin and phospholipid was highest in group Ⅱ and lowest in group Ⅲ(P value=0.02, 0.003). The level of cholesterol has similar trend but it was not statistically significant(p value=0.1). The level of bile acid was lower in Group Ⅱ, Ⅲ, Ⅳ than I, but not statistically significant(p value=0.06) In conclusion, Increased secretion of CCK by camostat mesilate dilute and decreased secretion of CCK by proglumide concentrated some bile composition, this effect may be derived from gallbladder contractility and bile flow. The reason why bile acid was not in similar pattern may come from inadequate dosage of drugs.

신성고혈압 흰쥐에서 측뇌실내 Captopril이 Bradykinin의 중추승압효과에 미치는 영향

정태호,양민준,오승호,전제열,염철호,윤평진 조선대학교 1994 The Medical Journal of Chosun University Vol.19 No.2

Effects of intracerebroventricular captopril on the central pressor response to bradykinin were examined in normotensive and 2-kidney, 1 clip (2KIC) Goldblatt hypertensive rats. The experiment was done under pentobarbital (50 ㎎/㎏. IP) anesthesia. Captopril (1 ㎎)and bradykinin (5 nmol) were administered into the right lateral cerebral ventricle, while arterial blood perssure and heart rate were continuously monitored throughout the experiment. Intracerebroventricular captopril did not affect the blood pressure within 10 minutes in both normotensive and 2KIC hypertensive rats, while it significantly augmented the central pressor response to bradykinin in the hypertensive rats. These observations suggest that an elevation in endogenous kinin levels is without effect on arterial pressure in normotensive and 2KIC hypertensive rats. However, the kallikreinkinin system in the central nervous system plays a role in the regulation of blood pressure, possibly maintaining the hypertension, in 2KIC hypertensive rats.

신성고혈압쥐에서 혈관내피층이 Phorbol Ester에 의한 수축에 미치는 영향

정수아,김형,차경훈,전제열,윤평진,염철호,박진,조남수,홍순표 대한순환기학회 2003 Korean Circulation Journal Vol.33 No.11

Reynolds Number 변화에 따른 방전형식의 제어와 Ozone 생성

이동인,이광식,오재열 嶺南大學校 工業技術硏究所 1993 工業技術硏究所論文集 Vol.21 No.1

This paper shows the characteristics of sparkover discharge in flowing air ranging from 0[m/s] to 30[m/s] under the non-uniform fields gap. The quantities of ozone generation are measured for various electrodes forms (needle-needle electrode, needle-rod electrode, rod-rod electrode) on the constant Reynolds Number(Re). Some principal results of this study are as follows. The discharge pattern can be controlled by adjusting the Reynolds number. The quantities of ozone generation at each corona forms are described as follows glow corona(g.c)<brush corona(b.c)<streamer corona(s.c). The quantities of ozone generation rapidly increases to 2[cm] and decreased over 2.5[cm] in case of various electrode gaps 1, 1.5, 2 and 2.5[cm] with constant Re.

Substance P의 기니피그 위 유문동 윤상근에 대한 수축 및 전기적 효과

서종옥,이승곤,김종승,전제열,여철호,윤평진 조선의대 1995 The Medical Journal of Chosun University Vol.20 No.2