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한글 및 영어 단어의 시각적 인지 시 N400 사건관련 뇌전위 및 감마대역 활성화
윤진,최정우,김자현,김경환,Yoon, Jin,Choi, Jung-Woo,Kim, Ja-Hyun,Kim, Kyung-Hwan 대한의용생체공학회 2008 의공학회지 Vol.29 No.6
The observations of difference and similarity in brain activities involved in processing different languages have fundamental importance in cognitive neuroscience. The purpose of this study was to investigate the difference and similarity in temporal brain activation patterns due to the language difference during visual perception of Korean and English words under priming. Especially, we tried to find the difference in evoked spectral power in gamma-band, which is known to reflect feature binding. The stimulation was visually presented as word pairs belonging to same or different categories so that N400 event-related potential(ERP) was evoked. Average ERP analysis and spectral analysis of gamma-band activity(GBA) were performed on 12 normal Korean subjects. Several ERP components such as P1, N1, N400, and P600 could be identified consistently, and the differences in N1, N400, and P600 were observed. From the spectral analysis, we found that the evoked GBA(eGBA) was significantly larger for English at ${\sim}100$ ms poststimulus. The latency of the eGBA was also considerably delayed for English. Overall, the results on the ERP components and eGBA analyses seem to be commensurate with subjects' familiarity of each language, and the difficulty of perceiving words of each language. The methods of this study can also be applied for clinical purposes considering that the language-related processing can be greatly altered for the patients with neurological or psychiatric diseases.
위암 조직에서 Helicobacter Pylori 검출에 대한 연구
이진호(Jin Ho Lee),전수영(Su Yung Jeon),함희용(Hee Yong Hahm),윤진일(Jin Il Yoon),황성보(Sung Bo Whang),정운태(Woon Tae Jeong),신원창(Won Chang Shin),김관엽(Kwan Yop Kim) 대한내과학회 1993 대한내과학회지 Vol.45 No.2
N/A Background: Helicobacter pylori infection is closely associated with chronic active gastritis and peptic ulcer. Recently, presence of H. pylori in gastric mucosa could play a role in the pathogenesis of gastric cancer. Method: We compared the positivity of CLO test between 41 cases of gastric cancer group and 54 cases of normal control group according to age and sex. Results: 1) There was no difference between positivity and negativity according to age and sex. 2) Total concordance rate of CLO test on the normal tissue was 73.2% in the gastric cancer group, 83.3% in the normal control group, according to the distribution in the stomach. There was no significant difference between the two groups. 3) Concordance rate between cancer tissue and surrounding normal tissue was 91.6% in upper stomach cancer and 75.8% in lower stomach cancer, total concordance rate was 80.5%. 4) Total concordance rate between cancer tissue and whole stomach was 73.2%. Conclusion: Our results suggest that Helicobacter pylori could play a significant role in the development of gastric cancer.
층류제트 부상화염에서 열손실에 의한 자기진동에 관한 연구
윤성환(Sung Hwan Yoon),박정(Jeong Park),권오붕(Oh Boong Kwon),김정수(Jeong Soo Kim),배대석(Dae Seok Bae),윤진한(Jin Han Yun),길상인(San in Keel) 대한기계학회 2011 大韓機械學會論文集B Vol.35 No.3
질소 희석된 프로판 부상화염에서 열손실에 의한 자기진동을 기초로 화염안정화선도를 도출하기 위하여 노즐직경 0.3 ㎜, 1.0 ㎜에서 실험적 연구를 수행하였다. 예혼합화염에서 확산화염으로의 전도 열손실에 의한 자기진동 및 매연 복사에 의한 자기진동을 관찰하였다. 0.1 ㎐보다 낮은 주파수 성향을 띄는 열손실에 의한 자기진동은 제안된 메커니즘에 의해 잘 묘사되었고 반면 매연복사에 의한 자기진동은 O(0.1 ㎐)의 주파수 범위를 나타내었으며 제안된 메커니즘은 항온항습실 실험을 통해 입증하였다. 질소 희석된 프로판 부상화염에서 관찰된 열손실에 의한 자기진동의 특성화는 관련된 변수 및 스트라훌 수에 의해 잘 묘사되었다. We experimentally investigated lifted propane jet flames diluted with nitrogen to obtain flame-stability maps based on heat-loss-induced self-excitation. We found that heat-loss-induced self-excitations are caused by conductive heat loss from premixed flame branches to trailing diffusion flames as well as soot radiation. The conductive-heat-loss-induced self-excitation at frequencies less than 0.1 ㎐ is explained well by a suggested mechanism, whereas the oscillation of the soot region induces a self-excitation of lift-off height of the order of 0.1 ㎐. The suggested mechanism is also verified from additive experiments in a room at constant temperature and humidity. The heat-loss-induced self-excitation is explained by the Strouhal numbers as a function of the relevant parameters.
김관태(Kwan-Tae Kim),이대훈(Dae Hoon Lee),차민석(Min Suk Cha),길상인(Sang-In Keel),윤진한(Jin-Han Yoon),송영훈(Young-Hoon Song) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
A combined hydrogen generator of plasma and catalytic reformers has been developed, and has been applied to stabilize unstable flame of 200,000 ㎉/hr LPG combustor. The role of the plasma reformer is to generate hydrogen in a short period and to heat-up the catalytic reformer during the start-up time. After the start-up period, the catalytic reformer generates hydrogen through steam reforming with oxygen (SRO) reactions. The maximum capacity of the hydrogen generator is 100 lpm that is sufficient to be used to stabilize the flame of the present combustor. In order to reduce NOx and CO emissions simultaneously, 1) FGR (Flue Gas Recirculation) technique has been adopted and 2) the hydrogen has been added into the fuel supplied to the combustor. Test results shows that 25 % addition of hydrogen and 30 % FGR rate lead to simultaneous decrease of CO and NOx emissions. The technique proposed in the present study shows good potential to replace NH₃ SCR technique, especially in the case of small-scale combustor applications.
직류 전기장을 인가한 층류부착화염에서 물질-열 확산 및 부력에 의한 화염진동 비교에 관한 연구
한종규(Jong Kyu Han),윤성환(Sung Hwan Yoon),박정(Jeong Park),김정수,윤진한(Jin Han Yun),길상인(Sang In Keel),김영주(Young Ju Kim) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
In this paper, we describe the behavior of two self-excitations in laminar attached free-jet flames under the influence of DC electric fields, one of buoyancy-driven and the other of diffusion-thermal instability, established from the horizontal and vertical injections. In the horizontal injection with removed buoyancy effect, oscillating flames with the frequency of 1.3?7.4 ㎐ were observed at flame conditions with Lewis number more than unity. On the other hand, Lewis-number-induced self-excitation as well as buoyancy-driven self-excitation appeared in the vertical upward injection with DC electric fields. The buoyancy-induced self-excitation frequency was in range of 1.6 - 9.4 ㎐. The characteristics of the two self-excitations with similar frequency ranges is discussed.
직류 전기장을 인가한 층류부착화염에서 물질-열 확산 및 부력에 의한 화염진동 비교에 관한 연구
한종규(Jong Kyu Han),윤성환(Sung Hwan Yoon),박정(Jeong Park),윤진한(Jin Han Yun),길상인,서상일(Sang Il Seo),김영주(Young Ju Kim) 한국연소학회 2011 한국연소학회지 Vol.16 No.3
In this paper, we describe the behavior of two self-excitations in laminar attached free-jet flames under the influence of DC electric fields, one of buoyancy-driven and the other of diffusion-thermal instability, establi¬shed from the horizontal and vertical injection. In the horizontal injection with removed buoyancy effect, oscillating flames with the frequency of 1.3 - 7.4 Hz were observed in a certain condition with Lewis number more than unity. On the other hand, it was appeared Lewis number induced self-excitation as well as buoyancy-driven self-excitation in the vertical upward injection with DC electric fields. This behavior had frequency range of 1.6 - 9.4 Hz and was exhibited to attribute the buoyancy effect. Finally, a well-defined division about two self-excitations having similar frequency range is briefly discussed.
연구보문 : 자연과학 ; 올보리 품종의 출수기 및 수량형질의 지역 안정성
성병열 ( Byung Ryeol Sung ),김정곤 ( Jung Gon Kim ),노재환 ( Jae Hwan Roh ),이혜림 ( Hye Rim Lee ),김대준 ( Dae Jun Kim ),윤진일 ( Jin Il Yoon ) 한국국제농업개발학회 2014 韓國國際農業開發學會誌 Vol.26 No.1
우리나라 보리 품종 중, 농가에 40년 이상 보급되고 있는 올보리 품종에 대하여 출수기 및 정곡수량의 안정성을 전·답리작별 5개 지역에서 검정한 결과를 요약하면 아래와 같다. 1. 올보리 품종의 평균출수기는 전작재배에서 진주가 4월 23일로 가장 빠르고, 밀양 4월 25일, 대구, 대전이 각각 4월 28일, 4월 30일이며, 수원이 5월 4일로 늦었다. 답리작재배에서 평균출수기는 밀양이 4월 24일로 빠르고 진주, 익산, 대구는 4월 26 ~ 27일, 대전이 5월 1일로 늦었다. 2. 정곡수량의 총 평균은 10 a당 전작 444 kg, 답리작 363 kg으로서 전작에서 답리작보다 81 kg 증수되었다. 전작재배에서 10 a당 평균수량 이상의 지역은 진주 488 kg, 대구 469 kg이었으며, 가장 적은 지역은 밀양의 385 kg이며, 수원과 대전은 평균정도의 수량을 얻었다. 답리작 재배 역시 진주에서 425 kg으로 수량이 높은 반면, 익산은 307 kg으로 가장 적었다. 3. m2당수수는 지역별로 거의 비슷한 경향이며, 전작에서 평균 567개로 답리작의 529개보다 38개 많았다. 4. 평균 1수립수는 전작에서 48립으로 답리작의 44립보다 4립 정도 많고, 천립중의 평균은 전작 33.9 g으로 답리작 33.2 g과 비슷하였다. 5. Stroike and Johnson(1973)의 모델을 분석한 결과, 올보리 품종의 환경지수는 -60에서 +60으로서 지수의 폭이 매우 작아 전 지역에서 안정적이며, 회귀계수 및 회귀에 기인하는 평균편차 평방화는 지역간에 다소의 차이가 있었다. 진주와 대구는 회귀계수가 1미만이고 표준편차 평방화도 적어 적응력이 높은 지역으로 나타났다. 6. Finlay and Wilkinson(1983)의 모델을 이용하여 안정성을 검정한 결과에서도 진주가 가장 적응력이 높은 지역인 반면, 전작의 밀양과 답리작의 익산은 안정성이 비교적 낮았으며, 다른 지역은 평균 안정성 지역으로 나타났다. 7. 올보리 품종의 5개 지역에서 정곡수량에 미치는 수량구성요소의 기여도는 중북부 지역인 수원, 대전과 답리작의 대구, 익산에서 m2당수수의 기여도가 매우 높았으며, 천립중은 낮았다. 전·답리작 5개 지역의 평균은 m2당수수 > 1수립수 > 천립중 순서로 높았다. Barley cultivar “Olbori” has been cultivated for more than 40 years in Korea. Here, we report heading date, yield stability of “Olbori” that has been evaluated in five locations of both upland and paddy fields. Models were based on the Stroike and Johnson analysis and Finlay and Wilkinson regression to analyse multi-environmental trials. The mean heading date of “Olbori” is earlist at upland in Jinju (April 23) and followed by Milyang (April 25), Daegu (April 28), Daejeon (April 30), and Suwon (May 4) the latest. The total main point quantity averages for cultivation in upland and paddy field were 444 kg/10 a and 363 kg/10 a, respectively. For upland cultivation, Jinju and Daegu showed 488 kg/10 a and 469 kg/10 a, respectively. These numbers are above the average. Milyang recorded the lowest main point quantity average. Suwon and Daejeon showed around the average. For cultivation on paddy field, Jinju recorded the highest, i.e., 425 kg, whereas Iksan showed the lowest, i.e., 312 kg. According to the analysis for Stroike and Johnson model, the environmental index for “Olbori” was between -60 and +60. This means, for all area, “Olbori” is quite stable to cultivate. The average deviation for squared partial correlation due to regression coefficient and regression, it showed some deviation depending on the area. Jinju and Deagu showed the highest adaptability. According to the stability analysis using Finlay and Wilkinson model, Jinju turned out to be most adaptable, whereas Milyang (for upland cultivation) and Iksan (for paddy field cultivation) showed relatively low stability. Other areas showed average stability.