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Pseudocercospora dendrobii에 의한 덴드로비움 검은잎마름병
권진혁,박창석 한국균학회 2002 韓國菌學會誌 Vol.30 No.2
2001년 경상남도 창녕군 남지읍 덴드로비움 재배포장에서 잎에 검은 잎마름 증상이 심하게 발생하였다. 병징은 아래 잎에 원형 또는 부정형의 점무늬가 생기며 표면은 옅은 갈색의 작은 함몰된 병반이 차차 증가하여 검게 변하면서 썩고 나중에 회색을 띤 검은색으로 말라죽으면서 낙엽이 된다. 조사한 포장에서 발생율은 64.8%이었다. 균사의 색깔은 짙은 올리브색이고, 분생자병은 옅은 회갈색을 띠며 5∼10개의 격벽을 가지고 분지하며 끝 부분이 가늘고 둔하다. 크기는 63∼164×3.2∼4.9㎛이었다. 분생포자는 옅은 올리브색이며 가늘고 긴 곤봉모양이며 곧거나 약간 굽으로 1∼5개 격벽을 가지며, 크기는 46∼98×3.2∼3.9㎛이었다. 균사 생육적온은 20℃이었다. 이 병원균의 병징 및 균학적 특징, 병원성을 검정한 결과, P. dendrobii에 의한 덴드로비움 검은잎마름병으로 명명하고자 제안한다. Sooty leaf blight was found on Dendrobium sp. in several farmers' fields located in Namji-eup, Changnyeong-gun, Gyeongnam province Korea in 2001. Symptoms of the disease appeared on leaves. Sooty leaf spots were started with amphigenous, subcircular to irregular spots, with light grayish brown to black color with definite margin lines on the upper surface of leaves. Infected leaves became defoliated and whole plants eventually were died. The infection rates of the disease in the surveyed area reached up to 64.8% in the early September. Conidiophores of the causal fungus were dark grayish brown in color, densely fasciculate, straight, curved to sinuous, branched, 5∼10 septate and 63∼164×3.2∼4.9 ㎛ in size. Conidia were pale to olivaceous in color, obclavatecylindric, straight to slightly curved in shape, 1∼5 septate and 46∼98×3.2∼3.9 ㎛ in size. The optimum temperature for mycelial growth of the fungus was 25℃. The fungus was identified as Pseudocercospora dendrobii on the basis of its mycological characteristics. This is the first report on sooty leaf light of Dendrobium sp. caused by Pseudocercospora dendrobii in Korea.
고등학생 및 대학생의 AIDS에 관한 지식 및 태도 비교조사
최길명,선우섭,이혁,조진우,이한 경희대학교 사회체육연구소 1996 體育科學論叢 Vol.- No.9
The present research is to provide basic data for establishing an effective educational program for preventing AIDS. The following are the results of data collected from 2,123 high-school third grade students (1,051 male and 1,072 female) and 2,109 college freshman students (1,483 male and 626 female) and analyzed in terms of their status, sex, and region: 1. As for the corrects answers to the questions concerning knowledge of AIDS, high-school and college male students tend to show higher grades, especially in theepidemic and non-epidemic aspects of AIDS. 2. As for the correct answers to the questions concerning attitudes to AIDS, high-school female students tend to show higher grades. 3. As for the corrects answers to the questions on knowledge of AIDS, college students received higher grades (p<.001), especially in the epidemic and non-epidemic aspects (16 questions) of AIDS. 4. As for the correct answers to the questions concerning attitudes to AIDS, college students received higher points (p<.05), especially in preventive attitudes (10 questions). 5. The regional order of correct answers to the questions concerning knowledge of AIDS in high-school students is Kyungsang, Choongchung, Kangwon, Chunla, Cheju, Seoul, and Kyunggee. But, the order of correct answers in college students is Chunla, Seoul, Kyungsang, Kangwon, Choongchung, Kyunggee, and Cheju. 6. The regional order of correct answers to the questions concerning attitudes to AIDS in high-school students is Choongchung, Cheju, Kyungsang, Seoul, Kangwon, Chunla, and Kyunggee. However, the order of correct answers in college students is Kangwon, Kyungsang, Choongchung, Chunla, Seoul, Kyunggee, and Cheju. The research result shows that the educational program for preventing AIDS must take into consideration knowledge on epidemic and non-epidemic aspects of AIDs and preventive attitudes toward AIDS. And, it also proves that it is necessary to devise an AIDS educational program for high-school and college students.
Effect of a Series Connection of a Bi-Electrolyte Hydrogen Sensor in a Leak Detector
( Hyeuk Jin Han ),( Chong Ook Park ),( Young Kyu Hong ),( Jong Suk Kim ),( Jeong Woo Yang ),( Yoon Seo Kim ) 한국센서학회 2015 센서학회지 Vol.24 No.1
Conventional leak detectors are widely based on helium gas sensors. However, the usage of hydrogen sensors in leak detectors has increased because of the high prices of helium leak detectors and the dearth in the supply of helium gas. In this study, a hydrogen leak detector was developed using solid-state hydrogen sensors. The hydrogen sensors are based on Park.Rapp probes with heterojunctions made by oxygen-ion conducting Yttria-stabilized zirconia and proton-conducting In-doped CaZrO3. The hydrogen sensors were used for determining the potential difference between air and air balanced 5 ppm of H2. Even though the Park.Rapp probe shows an excellent selectivity for hydrogen, the sensitivity of the sensor was low because of the low concentration of hydrogen, and the oxygen on the surface of the sensor. In order to increase the sensitivity of the sensor, the sensors were connected in series by Pt wires to increase the potential difference. The sensors were tested at temperatures ranging from 500.600oC.