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CO/HC 가스 인식을 위한 소형 전자코 시스템의 제작 및 특성
홍형기,권철한,윤동현,김승렬,이규정,김인수,성영권 ( Hyung Ki Hong,Chul Han Kwon,Dong Hyun Yun,Seung Ryeol Kim,Kyu Chung Lee,In Soo Kim,Yung Kwon Sung ) 한국센서학회 1997 센서학회지 Vol.6 No.6
system has been fabricated and characterized using an oxide semiconductor gas sensor array and pattern recognition techniques such as principal component analysis and back-propagation artificial neural network. The sensor array consists of six thick-film gas sensors whose sensing layers are Pd-doped WO₃, Pt-doped SnO₂, TiO₂-Sb₂O_5$gt;-Pd-doped SnO₂, TiO₂-Sb₂O_5-Pd-doped SnO₂ Pd coated layer, Al₂O₃-doped ZnO and PdCl₂-doped SnO₂. The portable electronic nose system consists of an l6bit Intel 80c196kc as CPU, an EPROM for storing system main program, an EEPROM for containing optimized connection weights of artificial neural network, an LCD for displaying gas concentrations. As an application the system has been used to identify 26 carbon monoxide/hydrocarbon (CO/HC) car exhausting gases in the concentration range of CO 0%/HC 0 ppm to CO 7.6%/HC 400 ppm and the identification has been successfully demonstrated.
Zonisamide 혹은 Topiramate를 사용한 뇌전증 환자에서 항뇌전증제 투약 전후 삶의 질 비교
홍형기,김지언,이장준,이세진,박성파,이상도 대한신경과학회 2011 대한신경과학회지 Vol.29 No.3
Background: Patients with epilepsy experience impairments in their quality of life (QOL). The objective of this study was to determine the influences of clinical factors on QOL and to compare QOL before and after antiepileptic drug (AED) treatment. Methods: A cohort of 79 patients with epilepsy (43 male and 36 female) was recruited for this prospective study. The Quality of Life in Epilepsy (QOLIE)-31 survey was applied to evaluate QOL. The QOLIE-31 questionnaire was completed by the subjects before and 24 weeks after AED monotherapy (zonisamide or topiramate). The relationships of demographic, social, and clinical factors with QOL were evaluated. Results: There was a negative correlation between seizure frequency and QOL in patients with epilepsy (p<0.05). The scores of patients without adverse effect were significantly higher for the seizure worry item of the QOLIE-31 questionnaire at 24 weeks compared to baseline (p<0.05). No other significant differences were found for any of the other QOLIE-31 items. Conclusions: Age, sex, seizure frequency, AED treatment, and AED adverse effects were significant clinical factors affecting QOL in patients with epilepsy. It is suggested that the physician should recognize these factors and manage them appropriately to improve the QOL of patients with epilepsy. Background: Patients with epilepsy experience impairments in their quality of life (QOL). The objective of this study was to determine the influences of clinical factors on QOL and to compare QOL before and after antiepileptic drug (AED) treatment. Methods: A cohort of 79 patients with epilepsy (43 male and 36 female) was recruited for this prospective study. The Quality of Life in Epilepsy (QOLIE)-31 survey was applied to evaluate QOL. The QOLIE-31 questionnaire was completed by the subjects before and 24 weeks after AED monotherapy (zonisamide or topiramate). The relationships of demographic, social, and clinical factors with QOL were evaluated. Results: There was a negative correlation between seizure frequency and QOL in patients with epilepsy (p<0.05). The scores of patients without adverse effect were significantly higher for the seizure worry item of the QOLIE-31 questionnaire at 24 weeks compared to baseline (p<0.05). No other significant differences were found for any of the other QOLIE-31 items. Conclusions: Age, sex, seizure frequency, AED treatment, and AED adverse effects were significant clinical factors affecting QOL in patients with epilepsy. It is suggested that the physician should recognize these factors and manage them appropriately to improve the QOL of patients with epilepsy.
산화물 반도체 가스센서 어레이와 패턴인식 기술을 이용한 전자코 시스템의 제작과 특성
홍형기,신현우,박현수,윤동현,권철한,이규정 경북대학교 센서기술연구소 1995 센서技術學術大會論文集 Vol.6 No.1
An electronic nose system using gas sensor arrays and neural-network pattern recognition has been fabricated. The sensor arrays consist of such thin or thick film oxide semiconductor sensing materials as SnO_(2), ZnO and WO_(3) containing a small amount of dopants. The principal component analysis and the neural-network pattern recognition analysis were used for the discrimination of such 6 flavor samples as vegetables(carrot and green onion), perfumes(men's and women's perfume) and alcohols(soju and passport). Good separation among flavor samples was obtained using the principal component analysis. The recognition probability of the neural-network for 6 flovor samples was 93 % for thin film and 98% for thick film type sensor array.
산화물 반도체 가스 센서 어레이와 패턴 인식기술을 이용한 가스 인식
홍형기,윤동현,권철한,박현수,신현우,이규정 경북대학교 센서기술연구소 1994 센서技術學術大會論文集 Vol.5 No.1
In order to identify C_(2)H_(5)OH, (CH_(3))_(3)N and CH_(3)SH gases, a gas recognition system using gas sensor array and pattern recognition technique has been fabricated. The sensor array consists of four thick film oxide semiconductor gas sensors whose sensing layers are Pt-doped SnO_(2), Pd-doped SnO_(2), Pd-doped ZnO and Pd-doped WO_(3). Three kinds of pattern recognition techniques such as principal component analysis (PCA), discrimination analysis (DA) and back propagation (BP) were used for the discrimination of gas species. The identification of C_(2)H_(5)OH, (CH_(3))_(3)N and CH_(3)SH gases has been successfully demonstrated.
제조업 사무직 종사자의 직무 스트레스가 알코올 조절실패에 미치는 영향: 대처 음주동기를 통한 고통감내력의 조절된 매개효과
홍형기,김현진 한국산업및조직심리학회 2021 한국심리학회지 산업 및 조직 Vol.34 No.2
본 연구는 제조업 사무직 종사자의 직무 스트레스와 알코올 조절실패 간의 관계에서 대처 음주동기를 통한 고통감내력의 조절된 매개효과를 검증하는데 그 목적이 있다. 이를 위해 경기도 및 전북 소재 제조업체 L사의 제조업 사무직 직원을 대상으로 온라인 설문을 실시하여 총 233명(남 212명, 여 21명)의 자료를 분석에 사용하였다. SPSS 22.0과 SPSS Macro PROCESS를 활용하여 매개효과, 조절효과, 조절된 매개효과를 검증하였다. 연구결과, 첫째, 직무 스트레스와 알코올 조절실패의 관계에서 대처 음주동기가 완전 매개효과를 갖는 것으로 나타났다. 둘째, 대처 음주동기와 알코올 조절실패의 관계에서 고통감내력이 조절효과를 갖는 것으로 나타났다. 셋째, 직무 스트레스가 대처 음주동기를 매개하여 알코올 조절실패로 이어지는 경로에서 고통감내력의 조절된 매개효과가 나타났다. 연구 결과를 토대로 제조업 사무직 종사자 집단의 직무 스트레스에 따른 알코올 조절 관리에 주는 본 연구의 의의와 제한점을 논의하였다.