한국인에서 일광 노출의 유해성에 대한 인지도와 일광 차단제의 이용 행태에 대한 연구

김상태,김기호,오선진,이승철,강세훈,윤재일,김진준,박석범,김홍용 대한피부과학회 1999 大韓皮膚科學會誌 Vol.37 No.6

Background: Although deleterious effects of sunlight have been increased recently, the surveillance of the attitudes toward sun-exposure and the behavioral aspect of using sunscreens in Koreans has hot been carried out. Objective: Our purpose was to evaluate the attitude toward the harmfulness of sun-exposure and behaviors of using sunscreens in Korea. Method: Five hundred and fifty-two subjects were surveyed to assess the attitude toward sun-exposure, as well as the subjects knowledge about, and the use of sunscreens. Underlying data including demographic data, skin colors, skin types, occupation, and sun-exposure, were obtained. Results: Fifty-four percent of subjects believed that sun-exposure is bad for their skins, but, on the contrary, 12.5% believed it to be beneficial. Fifty-two percent of subjects used sunscreens. Almost all subjects(93.8%) knew why to use sunscreens but 62.7% of subjects did not know the meaning of sun protective factors(SPF). Women, indoor workers, subjects less than 40 years old, with less sun-exposed, fair colored skin, or with skin type I, II, III tended to know the deleterious effects of sunlight and the meaning of SPF and used more sunscreen. Conclusion: High risk population-men, outdoor workers, subjects oider than 40 years old, with more sun-exposed, dark colored skin, or skin type VI, V could be targeted with campaigns that promote attitudinal and behavioral changes.

GC-ECD를 이용한 유기염소계 및 Pyrethroid계 농약 동시 분석법

김우성,이선화,김재이,정지윤,이명자,박영채,이영자,정성욱,이봉헌,박흥재 한국환경과학회 2003 한국환경과학회지 Vol.12 No.4

Pesticides were extracted from samples with 70% acetone and methylene chloride in order, and then cleaned up via open-column chromatography apparatus packed with florisil, and finally analyzed simultaneously the organochlorine and pyrethroid pesticides using GC(ECD). An ultra-2 fused silica capillary column was used to separate and identify the products. The resolution between the last isomeric peak of cypermethrin(59.987min) and the first isomeric peak of flucythrinate(60.043min) was not satisfactory. The last isomeric peak of fenvalerate(62.344min) and the first isomeric peak of fluvalinate(62.397min) were overlapped. Recoveries of soybean sample for the most pesticides were 73.3% to 102.4%. Detection limits were between 0.004 and 0.063 ㎍/㎎ when this method was used.

마우스에서 조합시험법에 의한 고려홍삼의 생식발생독성 평가

김미라, 박동선, 장자영, 신선희, 이예은, 백인정, 연정민, 이세라 , 남상섭, 황방연, 노재섭, 김순선, 조대현, 남상윤, 이범준, 김윤배, 윤영원 충북대학교 동물의학연구소 2006 Journal of Biomedical and Translational Research Vol.7 No.1

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發破에 있어서의 岩盤內의 應力分布와 破壞에 對하여

李在善 淸州大學校 1983 論文集 Vol.16 No.2

Explosives perforatingly charged on the rock bed in free face were blasted under the sufficient sealing detonation pressure and gas pressure transmitted to the rock bed developed shock wave and stress wave and thus caused the cemplicated stress distribution in the rock bed. particularly in the neighborhood of free face, breaking was occured by the tensile stress wave reflecting from the free face. By the action of such the tensile stress wave, funnel hole-shaped breaking was developed from the free face to the blasting center. Funnel hole-shaped fissure originated in σ₂_(max) and radial rupture centering around burden of crater originated in σ₃_(max).

복숭아심식나방(Carposina niponesis Walsingham)의 發育에 미치는 溫度의 影響에 關한 硏究

李昌喜,玄在善,金基滉 서울大學校 農科大學 1982 서울대농학연구지 Vol.7 No.2

The peach fruit moth, Carposina niponensis Walsingham, was reared under verious temperatures; 20℃, 25℃, 30℃, and room condition. The effect of the rearing temperatures on the development were examined. The results obtained are as follows: 1. The seasonal change of the damaged fruits of apple was examined. The damaged fruits increased greatly in August, when the number of apple fruits had stabllized. It seemed to have two generations in an year in Suweon area according to the seasonal change of the damaged fruits. 2. The adult longevity of peach fruit moth decreased at high temperatures, and ovipositional periods were shorter at 30℃ compared with the lower temperatures tested, suggesting that such a high temperature hasten the sexual maturity of the adult. The longevity of the female was longer than that of the male. 3. No significant effects of the temperatures on the number of eggs laid by a female were observed in the temperature range from 20℃ to 30℃, and they were ranged 85∼170 eggs. 4. The median of days required for the completion of the various life stages were 6.9∼12.1 days for eggs, 15.8∼26.0 days for larvae, and 11.3∼20.0 daus for pupae, depending on the rearing temperatures. The velocity of development in eggs and larvae increased linearly at temperature range from 20℃ to 30℃, while there seemed to be slight retardation of development for the pupae at 20℃. The velocity of development was greater with higher temperatures. 5. The calculated developmental threshold temperatures were 6.6℃ for eggs, 5.4℃ for larvae, and 6.4℃ for pupae, and overall developmental threshold temperature was estimated as 60℃. 6. The estimated values of the total effective temperatures were 150∼170 day degrees for pupae, and overall total effective temperature would be 790∼850 day degrees based on the overall threshold temperature of 6℃. 7. A predietion formula was suggested as Y=-2.419X+105.257, where Y: Number of days required to complete a life cycle. X: Temperature treated, based on the total effective temperature.

近代小說과 父子關係의 問題

李在銑 동국대학교 한국문학연구소 1990 한국문학연구 Vol.0 No.13

사과를 加害하는 응애類 個體群 動態에 關한 硏究

玄在善,李順遠 서울大學校 農科大學 1985 서울대농학연구지 Vol.10 No.1

1982∼1984年 걸쳐 殺蟲劑와 殺비劑의 處理 및 地面雜草 管理를 달리 하면서, 食植性 응애類의 發生 및 密度變動과 이들의 主要天敵인 捕食性 응애類의 種類 및 活動狀況을 調査하여 다음과 같이 結果를 얻었다. 1. 사과응애는 5月부터 出現하여 7∼8月에 最高 密度에 達하고 以後 10月까지도 發生하였으나, 殺비劑撒布下에서는 대체로 年中 密度가 낮게 維推되었다. 2. 점박이응에는 前年度 越冬密度가 높을 경우에는 5月부터 樹上에 出現하고, 越冬密度가 거의 없을 경우에는 7月 以後에 近接한 棲息處에서 分散·移動하였고, 7∼8月에 급격히 密度가 增加되며, 9∼10月에도 繼續높은 密度를 維持하였다. 또한 殺비劑 處理後 密度回復이 일어나서 處理前보다 휠씬 높은 密度로 增加하는 傾向이 있었다. 3. 殺비劑를 地面撒布하거나 淸耕栽培를 하는 것이 本 試驗區 狀況下에서는 점박이응애의 樹上密度 抑制에 큰 影響을 주지 못하였으며, 捕食性 응애類에 대해서는 오히려 減少시키는 影響이 있었다. 4. 捕食性 응애로 Amblyseius longispinosus(Evans)와 Agistemus terminalis(Quayle) 두種이 發見되었으며 前者는 韓國에서 새로이 發見되었으며, A. longispinosus는 점박이응애에 좀더 效果的인 捕食응애였으나 環境條作에 따라 發生量에 큰 差異가 있었고, A. terminalis는 捕食效果는 낮은 반면에 比較的 安定된 發生相을 나타내어 今後 이들에 대한 評價가 要求된다. The purpose of this study was to examine the seasonal population dynamics of the two phytophagous mites ; two-spotted spider mite. Tetranychus urticae Koch, and European red mite, Panonychus ulmi (Koch), and to evaluate their predaceous mites in the apple orchard. The European red mite seemed to be minor pest, and it seemed to be effectively controlled by the acaricide application. But, the two-spotted spider mite seemed to be the most serious pest. Its density became high enough to require some control measures by middle or late July. There seemed to be common phenomenon of resurgence to the acaricide application in this mite, therefore its density gets the position of economic injury level in short time after treatment. The two-spotted spider mite also feeds on various broad leaf weeds growing under the apple tree in the spring, and later moves to apple tree when the nutritional conditions of the host and other cultural environments become unfavorable. Therefore, the population dynamics not only in the tree but also on the ground cover were important for effective control of the two-spotted spider mites. Two predaceous mites were found ; Amblyseius longispinosus (Evans), and Agistemus terminalis(Quayle). A. longispinosus was effective biological control agent to the two-spotted spider mite, but its density was highly variable with the management system from one plot to another, and from year to year. The density of A. terminalis was considerably high except on the pesticides treated plots, and seemed to be effective predator for the phytophagous mites after August.

回轉圓板의 應力擴大係數에 관한 硏究 : Stress Freezing Method of Photoelastic Experiment

최선호,이충섭,권재도,황재석 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.2

It is well known fact that the stress distributions in the vicinity of crack tip and fracture problems are governed by stress intensity factor which is presented as a function of the crack shape, boundary condition and loading mode etc. In. the determination of the stress intensity factor, there are many theoritical and experimental methods. Among them the stress freezing method of photoelastic experiment has been considered to be one of the most accurate experimental methods which have been used for stress analysis. In this paper, this method was applied to the rotating disk with inner arbitrary crack. The results of photoelastic experiment for disk with various straight cracks, radial and others which are oblique to the radical direction were as follows. In case of radial crack, in comparison with the results of photoelastic experiment obtained by stress freezing method and the theoritical solutions of Blauel, stress freezing method is fully available for analysis of uniform dynamic status.

랫드에서 단일시험법을 이용한 반하 물추출물의 생식독성시험

이기남,유욱준,백인정,연정민,남상섭,이범준,남상윤,김윤배,강현규,안병우,김대중,황방연,노재섭,홍정섭,성하정,김순선,조대현,윤영원 충북대학교 동물의학연구소 2006 Journal of Biomedical and Translational Research Vol.7 No.1

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수평 비원형 환상공간에서의 자연대류에 관한 실험적 연구

배대석,이재신,권순석 동아대학교 공과대학 부설 한국자원개발연구소 1990 硏究報告 Vol.14 No.2

An experimental study has been carried out on natural convection in the annulus between horizontal non-circular cylinders. A Mach-Zehnder interferometer was used to determine temperature distributions and local heat-transfer coefficients. Results were obtained using air at atmospheric pressure with a diameter ratio D_(o)/D_(i)=2.6, and aspect ratio H/D_(i)=0.6 in range of Rayleigh number from 0.45×10⁴ to 1.98×10⁴, Comparisons between the existing numerical and present experimental results show good agreement.