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애멸구 發生의 地域的 特性 : -誘蛾燈資料의 統計的 特性-
玄在善 서울大學校 農科大學 1977 서울대농학연구지 Vol.2 No.2
The daily light trap catches of the smaller brown planthoppers from 1965 to 1976 in Korea were analysed in relation to the characteristics of the type of catches in various locations. Years with unreliable data were omitted and only locations with more than 500 annual catches of six or more years used. The results were as follows: 1. The annual catches of the insects and the per cents of the accumulated catches by the end of July were relatively low in the locations north to 37°in latitude, and it is suggested that it might be related with the lower population of the overwintered nymphs and delayed build up in populations. 2. It was noticed that some abnormal catches; unusually great numbers were caught on a day in comparison with those on the previous and on the next days, were observed in Daegu, Jincheon, Boeun, Sangju, which are located in the mountainous areas. 3. The per cents of the corrected data, which were calculated from the data excluding the abnormal catches, and the numbers of the insect on the previous and on the next days, to the actual catches and the per cents of the accumulated catches by the end of July to the annual ones were high in the far southern locations and early populations build up seemed to be fast. 4. The annual catches were smaller in the eastern parts than in the western locations of Taebaek Mountains. 5. The western areas of the Taebaek Mountains south to the 37°in latitude could be divided by Charyung, Noryung and Sobaek mountains, and the locations north to the Charyung Mountains had relatively low catching ratio by the end of July. The locations south to the Sobaek Mountains had greater annual catches and higher per cents of catches comparison to the north by the end of July, specially the per cents of the accmulated catches by the end of June were great. The plains between Charyung and Sobaek Mountains have intermediate types and considerably different in types among the locations. 6. Following types could be recognized in Korea. a. Northern type: North to 37°in latitude. b. Eastern type: Eastern parts of the Taebaek Mountains. c. Western type: Western parts of of the Taebaek Mountains: 1. Seosan type: North to the Charyung Mountains. 2. Honam plain type: Plain areas between the Charyung and Sobaek Mountains. 3. Southern coastal type: Coastal areas of southern sea. 4. Daegu type: Daegu inland areas.
담수지에서의 식물성 Plankton 군집의 계절적 변동에 관한 연구 : Study on Phytoplankton Population Dynamics in Two Reservoirs
현재선,양승원 서울대학교농과대학농업개발연구소 1989 서울대농학연구지 Vol.14 No.2
This study was carried out to examine the seasonal changes of abiotic factors and characteristics of phytoplanktonic community to investigate the probable casual relationship between them at two reservoirs near Suweon City during the period from August 1987 to July 1989. 1. Caracteristics of physical and chemical factors. 1-1. The water temperatures were higher at Ilweol reservior than at Uncheon reservoir throughout the year with exception January and February, 1988. 1-2. The dissolved oxygen concentrations (ppm) and its saturations were higher at Ilweol reservoir than Ucheon reservoir in spring and fall, but low in winter. 1-3. The average concentrations of NH₄-N (ppm) were about 2 times higher at Ilweol reservoir, than at Ucheon reservoir and 15 times at the winter peak. 1-4. The concentrations of PO₄-P (ppm) were so as NH₄-N, but its absolute concentrations and variation were lower than NH₄-N. 1-5. The values of pH were slightly higher at Ilweol reservoir than at Ucheon reservoir, low in winter and increased toward summer. 2. Characteristics of phytoplanktonic community. 2-1. The total species identified were 209 species in 84 genera; 149 species in 48 genera at Ilweol reservoir, and 182 species in 66 genera at Ucheon reservoir. Reservoir-specific species were 29 species in 18 genera at Ilweol reservoir, and 59 species in 36 genera at Ucheon reservoir. 2-2. The average densities of the phytoplankton were greater at Ilweol reservoir than at Ucheon reservoir, and so in vaiations. 2-3. In general, the dominant plankton groups were green algae for Ilweol reservoir and diatom for Ucheon reservoir during the study. 2-4. Dominance indicies were greater at Ilweol reservoir than at Ucheon reservoir. While species diversity indicies (Shannon, Evenness, Richness indicies) were greater at Ucheon reservoir than at Ilweol reservoir throughout the year. 2-5. Cyclotella meneghiniana seems to be the common dominant species throughout the year in two reservoirs. The seasonal dominant species showed considerable difference between the two reservoirs, reflecting the difference in the conditions of mineral nutrients at two reservoirs. The relationship between the dominant species and the two mineral nutrientswas examined and found significant for NH₄-N, indicating to be more important than PO₄-P. 2-6. The dominant plankton genera were Oscillatoria, Anabaena, Microcystis, Merismopedia (blue-green algae), Scenedesmus, Micractinium, Ankistodesmus, Golenkinia (green algae), and Cyclotella (diatom) for Ilweol reservoir, while Synedra, Fragilaria, Tabellaria (diatom), Staurastrum, Characium, Pleurotaenium, Astrococcus, Chlorella(green- algae), and Oscillatoria (blue-green algae) for Ucheon reservoir.
玄在善,黃淳珍 서울大學校 農科大學 1986 서울대농학연구지 Vol.11 No.1
This study was carried out to examine the seasonal changes in the abiotic conditions in two reservoirs on the outskirts of Suweon City. The water temperatures, dissolved oxygen,NH₄-N, PO₄-P, saturation rate of oxygen, and pH values throughout the period from September, 1984, to August, 1985, were measured. Ilweol reservair seems to have characteristics of eutrophic conditions than those of Ucheon reservoir in the examined conditions.
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.
조시현;문상수;김기환;도민균;서재현;김태공 인제대학교 2012 仁濟論叢 Vol.27 No.1
Recently, as the Smart Phone is rapidly disseminated worldwide, it is emerging as an important digital communication media changing the communication types of users. We use the Smart Phone in all aspect of daily life besides communication. The Smart Phone is indispensible tool that has a great ripple effect on our daily life. Therefore, if the Smart Phone users lose or do not bring their phones, they were troubled. In this paper, we make users available to use the Smart Phone, even if they lose or do not bring their phones. To do this end, we develop features that search the phone in case of not knowing where it is, that contact another phone in case of not bringing their phone, that lock the phone in case of losing it. We expect these features promote a expansion and a vitality of the Smart Phone market.
Gerbera(Gerbera hybrida Hort)의 형태적 특징과 유전적 유연관계 분석
김현애,임현희,양원진,이재헌,이병영,이용문,권오창 동아대학교 농업생명과학연구소 2001 農業生命資援硏究 Vol.10 No.1
This study was conducted to analyze the morphological characteristics and genetic relationships among 24 species of Gerbera. Most of flower colors were pink. The numerical order of flower color was pink, orange, red, double-colored, and milk-white. Majority of flower types were single or semidouble flowers. A few species were double flowers. Flower diameters were from 7cm to 12cm, showed significant differences compared to other characteristics. Flower stalks were ranged from 55cm to 65cm. Only one species was the shortest as 55cm. The others were similar size as about 65cm. Main annual production yields were between 190 and 400 blossoms. Fifty seven reproducible polymorphic bands from eighty primers were used for analyses of genetic similarity. The genetic similarity of 24 collected Gerberas was largely classified into five groups. The average similarity coefficient was 0.72 ranged from 0.50 to 0.90. The highest similarity coefficient was shown between 'Sardana' with red/white flower color and double flower type, and 'Tamara' with orange flower color and double flower type as 0.90.
효소 및 추출을 이용한 전분이 함유된 고분자 필름의 생분해도 측정
김재현,박태현,한귀영 성균관대학교 생명과학자원연구소 1994 生命資源科學硏究 Vol.1 No.1
Various methods were proposed for the measurement of biodegradability of polymer materials by American Society for Testing and Materials(ASTM). In those methods, carbon dioxide evolution, oxygen consumption, and the weight loss of polymer are measured for the evaluation of biodegadability when microorganisms grow by using the polymer material as the only carbon source. Since a month or longer time is needed to measure the quantities, a rapid quantitative mathod is required to be developed. We used α-amylase for determining the biodegradability of starch-filled polyethylene film: however, the enzyme reaction was so slow. Further studies on the reaction conditions are necessary for the rapid completion of the reaction. Therefore, starch content in the film was measured for the evaluation of biodegradability on the assumption that starch is a perfect biodegradable material. NaOH solution was used for the extraction of starch from the film and the weight loss of the film was measured.
유방통을 호소하는 한국 여성에서 Gamma Linolenic acid의 임상적인 효과
정재헌,김권천,조현진,민영돈,김성환,김정용,장정환 조선대학교 부설 의학연구소 2000 The Medical Journal of Chosun University Vol.25 No.1
Background and Objectives : Recently, the incidence of breast cancer is gradually increasing in korea. Many patients visit the hospital with a fear of breast cancer, if she had the pain in her breast. But Breast pain is not a cardinal sign of breast cancer. Only 7% of patient in breast cancer has breast pain. Materials and Method : To know the clinical effects of gamma-linolenic acid(GLA), we analyzed the medical records of 55 cases with breast pain, who visited the outpatient clinic of Chosun university hospital, between July of 1999 to December of 1999. Of the 55cases of breast pain, we analyzed 26 cases of patient with breast pain who was treated with GLA for 2 month and we excluded patients of breast pain who had breast mass or were treated with other drug. Results : 2 Patients we are dropped out because nausea and vomiting were developed, 4 Patient with breast pain were treated with GLA for 1 month, and relieved completely from mastalgia and 8 patients with breast pain were treated with GLA for 2 months and breast pain was relieved completelys. 4 patient had treatment for 2 months, were relieved slightly. But 8 patients with breast pain didn't reveal the relief of symptom after the intake of GLA. Conclusion : We conclude that GLA could be considered a first line drug in patients with mastalgia.