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나기상,이석호,임동우,김병국,박찬일 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.2
Nasal patency may be considered to have two aspects: the resistance to airflow and the sensation of airflow. Although the sensation of nasal airflow has received little attention from clinicians, it is likely that it is of great importance in clinical practice. However, there are no study that assess the sensation of nasal airflow in patients complaining of nasal obstruction. The aim of this study is to assess the airflow sensitivity of the nose in patients with chronic paranasal sinusitis. To assess the airflow sensitivity, we designed an apparatus delivering a pulsing jet of air at varying velocities. We measured threshold velocities at six different sites of each nasal cavity in fifteen patients and compared with the values in normal subjects. All patients had bilateral chronic sinusitis with polyp. The threshold velocities at all but site 5 were higher in sinusitis patients than in normal subjects. The difference at site 1, 3, 4 and 6 was statistically significant. Since a high threshold velocity indicates low sensitivity, our results suggest that airflow sensitivity is lowered in patients with chronic sinusitis. Disturbance of airflow sensation may contribute to the sensation of nasal obstruction in patients with chronic paranasal sinusitis.
2차측 능동크램프 방식의 영전압 영전류 스위칭 풀브리지 DC-DC 컨버터
송찬일,이상일,김병철 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.2
The zero voltage switching(ZVS) full-bridge(FB) PWM dc-dc converter is characterized by high efficiency, low switching stress and simple topology. But because of primary current in the circulating period, conducting loss of the lagging leg device occur. In this paper, a novel zero voltage and zero current switching(ZVZCS) FB Phase-Shift(PS) PWM dc-dc converter was proposed. The converter has secondary auxiliary circuit using R, L, D. The proposed secondary auxiliary circuit is simple and lossless but removes the primary current for circulating period effectively. The 50kHz, 300W prototype converter was experimented for verification of the converter characteristics. The proposed converter has good characteristics of ZVZCS and high efficiency of 91%.
김병수,장성종,부귀범,조운택,박찬국,김만우,변주남,김정용,전호종 조선대학교 2001 The Medical Journal of Chosun University Vol.26 No.1
Small bowel leiomyoma is a rare tumor which may occur wherever smooth muscle is present. The small bowel is the most common site and it makes up 20~30% of all benign small intestinal neoplasms. A spectrum of symptoms are common ranging from nausea, vomiting, abdominal pain, to massive intestinal bleeding. Bleeding is the most common symptom and is usually gross and recurrent. Occasionally it may be life threatening. But, the most serious problem is both the absence of specific clinical symptoms, and the difficulties shown in radiological diagnostics of the small bowel. If conventional diagnostic methods fail to reveal any positive findings for gastrointestinal bleeding, the diagnosis of intestinal leiomyoma should be suspected and an SMA angiography shoud be performed. The angiographic criteria of small bowel leiomyoma is very characteristic. We present a case of leiomyoma with considerable and prolonged gastrointestinal bleeding, which was diagnosed by angiography. A 61-year old woman was admitted with a history of melena over the last 10 days. An SMA angiography showed a hypervascular mass with a diameter of 3×3cm. A segmental resection was performed under the impression of the gastrointestinal bleeding due to leiomyoma of the small bowel. Microscopic examination of the lesion shows interlacing or whorl bundles of spindle shaped ces and no mitosis.
도시형한옥의 주거공간 변화에 관한 연구 : 전주시 풍납동을 중심으로
정성일,황병찬,진정 全北大學校 附設 都市및環境硏究所 2000 都市 및 環境硏究 Vol.15 No.1
This study is on the transition of residential space. The Urban Traditional Housing is a housing that had been built from 1950's in the Jeonju City. It was supplied by private housing developers organized with traditional craftsmen and its form was based on the traditional housing The cause of transition Housing in space are growth of family, rental income, and change of living style. The restriction and socio-cultural changing In this respect this thesis aimes at one of the ways which help dwellers to express themselves more easily and to make them more satisfactory in their houses. For this purpose, the concept of personalization of housing is introduced and its meaning in physical environment is discussed.
朴相瓚,趙炳烈 충주대학교 1997 한국교통대학교 논문집 Vol.32 No.2
The objective of this study is keeping up radiation safty control from uranium material contamination. Accordingly, the check and radiation monitoring of the lagoon has been perfomed periodically. The liquid waste in lagoon will be vaporized mostly into the atomosphere by spontaneity of natural pheonmeunm after about four years.The uranium concentration in the liquid waste of lagoon reduced considerably to about 40 ppm from 2 g/l quantities of this early year due to uranium precipitation.
李晟熙,韓秀贊,韓秉基,具秉俊 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
Recently, composite materials have widely become available to engineers. This paper briefly explains the applications of these materials and shows how these materials can be used to repair structures with damages such as crack, notch, etc. Before the fatigue test, notched and repaired specimens with thin laminate composite are prepared. Also, test apparatus is designed to perform four point fatigue test of specimens. From the experimental result, it was found that present repair technique could be used to enhance the life of damaged structures.