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윤진한(Jin-Han Yoon),차형우(Hyeong-Woo Cha),이만섭(Man-Seop Lee),조영창(Young-Chang Cho) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
A novel AC-DC switching technology is suggested without inductors for one-chip semiconductor. The suggested converter consists of a rectifier diodes, AC source level detector, switching control, detector of over-current and voltage, feedback controller and switching block, The key technology of the proposed AC-DC converting methode is detecting of the low level voltage for AC voltage, power control transistor and rectifying of DC level. The measurement results with commercial devices show that the converter has power efficiency of 66.5% for DC 12V 0.24A and the standby power is 49.58㎽ at AC 110V.
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.