비정질 인듐갈룸ᅳ아연-산화물 박막트랜지스터 기반의 AMOLED 화소 회로

이재표(Jae-Pyo Lee),유경민(Kyeong-Min Yu),장진녕(JinNyoung Jang),홍문표(MunPyo Hong),배병성(Byung Seong Bae) 호서대학교 공업기술연구소 2013 공업기술연구 논문집 Vol.32 No.2

본 논문은 비정질 인둠ᅳ갈f ᅳ아연-산화물 박막트랜지스터 (a-IGZO TFT)를 이용하여 능동형 유기발광다이오드 (AMOLED)용 문턱전압(Vth )을 보상하는 화소 회로를 제안하였다. 산화물 TFT는 n-채널 TFT로써, 우리는 n-채널 TFT 특성으로 회로를 최적화하였다. 제안된 화소 회로는 회로 시뮬레이션 뿐만 아니라 회로 분석을 이용하여 확인되었다. 제안된 화소 회로는 AMOLED에서 구동 TFT의 문턱전압 변화를 보상할 수 있다. 제안된 화소 회로를 이용함으로써, 문턱전압 보상은 달성되었다. rhis paper proposes a tnresnold voltage compensation pixel circuit for active-matrix organic light-emitting diode (AM OLED) using amorphous indium-gaUiimi-zinc-oxide thin-film transistors (a-IGZO TFTs), Oxide TFT is an n-channel TFT; therefore, we optimized the circuit for the n-channel TFT characteristics. The proposed pixel circuit was verified using circuit analysis as well as circuit simulations. The proposed circuit could compensate for the threshold voltage variations o f drive TFT in AM OLED. Using the proposed pixel circuit, threshold voltage compensation was achieved.

중증 만성정신질환자 수의 추산 : Through Two Community Surveys 두 지역사회 조사를 중심으로

홍진표,김윤,배재남,정유진,강영호,양병국,김용익,김병후,이철,조맹제 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.2

국내 중증 만성정신질환자 수를 추정하기 위하여 일 농촌 및 대도시 지역의 지역의료보험 및 의료보호 대상자 중 1993년 1년간 의료기관에서 정신증 상병(ICD-9 code 상 290-299) 및 알콜 남용/중독, 성격장애 및 정신박약 진단하에 치료를 받은 적이 있는 사람에 대해 설문조사를 실시하였다. 연구자들이 개발한 진단도구를 이용하여 진단을 평가하고, Strauss-Carpenter scale 등을 이용하여 기능 장애를 평가하고 유병기간 등을 조사하였다. 결과를 요약하면 다음과 같다. 1) 진단평가상 정신분열병군(61.1%)이 가장 많았으며, 정동장애군(23.7%), 알콜장애군(11.2%), 기질성 정신장애군(4.0%)의 순서이었다. 2) 직업활동정도는 진단군별로 차이가 많았다. 지난 1년간 직업활동이 6개월 미만이거나 전혀 없는 환자 비율이 정신분열병군은 67.2%, 알콜장애군 52.0%, 정동장애20.8%의 순으로 정신분열병군이 가장 불량하였다. 3) 사회활동도 진단군별로 차이가 많아서 지난 1년간 의도적, 사회활동이 없는 비율이 정신분열병군이 가장 높았고(72.3%), 알콜장애군(32.0%), 정동장애군(20.7%)의 순이었다. 4) 국내 의료보험 및 사회복지시설 이용 자료 등을 토대로 본 조사 결과를 적용한 결과 국내중증 만성 정신질환자의 수는 약 8만 7천명으로 추산되었다. Objectives: The purpose of this study was to estimate the number of serious and persistent mentally ill patients in Korea. Methods : Study populations were recruited from medical insurance data of two district areas ; one rural and the other urban areas. Subject were all mentally ill who had ever visited any hospital in 1993 and were diagnosed as having psychosis, personality disorder and drug abuse. We conducted a home visiting survey applying semi-structured diagnostic interview, assessing the level of social adjustment with Strauss-Carpenter Scale, and past psychiatric history by the trained researchers, in October and November,1994. Results : According to diagnostic assessment schizophrenic patients constituted the major portion(61.1%) of study subjects. The distribution of occupational functions and social contacts was variable according to diagnosis. Most schizophrenic patients were unemployed or worked less than 6 months in the previous year(67.2%), and showed poor social contact(72.3%). But affective disorder patients were relatively independent in job maintenance and social relationship. Alcoholic patients lay between those of schizophrenic and affective disorder groups. It was estimated that about 87,000 adult Koreans were suffering from chronic mental disorders which seriously interfere with their daily life. Conclusions : Serious and persistent mentally ill patients were common in Korea. Community support program should be provided for them.

豆乳 및 Cheese Whey를 利用한 乳酸醱酵

洪在訓,金永培,劉太鍾 建陽大學校 1992 建陽論叢 Vol.- No.1

豆乳를 이용한 乳酸醱酵時 cheese whey를 첨가함으로써 乳酸菌의 醱酵能 및 風味에 미치는 영향을 조사, 醱酵乳로서의 타당성을 검토하였다. 발효용 균주로는 L.bulgaicus와 S.thermophilus의 1:1 혼합 starter를 이용하였으며 얻어진 결과는 다음과 같았다. 유산균의 생육과 산생성, cure 형성에 있어서 가장 적당한 soy milk와 whey의 혼합비율은 9:1이었고 soy milk-whey-mixture (SWM)에 lactose 첨가에 의한 균생육 및 산생성능이 향상되었다. 본 실험조건에서 SWM, soy milk, skim milk 에서 검출된 carbonyl compounds는 acetaldehyde, aceton, tehanol, hexanal, diacetyl등 이었으며 그 중 acetaldehyde가 가장 많았다. 또한 SWM의 amino acid 含量은 glutamic acid, aspartic acid, arginine etc. 順으로 나타났으며 그 영양적 가치는 skim milk나 soy milk에 뒤지지 않았다. 官能檢査의 결과는 色에 있어서 SWM, skim milk, soy milk 사이에 유의차가 없었으며 냄새에서는 skim milk와 다른 두 시료간에 1% 유의차가 있었고 맛에서는 skim milk와 soy milk 사이에 5% 유의차가 있었다. Cheese whey was added to soy milk for lactic acid fermentation by L. bularicus + S.thermophilus and its effects on cell growth, acid production and flavor were investigated. Bacterial growth, acid production and acid formation were best in soy milk concluding 10% of whey. Acid production and bacterial growth were improved by adding of lactose to soy milk-whey mixture (SWM). As volatile carbonyl compounds of SWM< acetaldehyde, acetone, ethanol, hexanal and diacetyl were detected by gas chromatography. AMong them, the amont of acetaldehyde are the largest. The result of sensory test showed no significant difference in taste between fermented skim milk and SWM, and SWM, and SWM and soy milk.

소아의 상부 위장관 이물질에 대한 임상적 고찰

유재홍 충남대학교 의과대학 지역사회의학연구소 1995 충남의대잡지 Vol.22 No.2

All patients (135 cases) of ingested foreign bodies in the upper GI tract at emergency and pediatric department Chungnam National University Hospital from January 1993 through October 1995 were reviewed for the age and sex distribution of patients, the type of foreign body, its location, the duration of its ingestion, removal methods, endoscopic finding and complication. The results were as follows : 1) The ages ranged from 3 months to 15 years with 111 cases less than 5 years of age, 20 cases between 5 to 10 years of age, and 4 cases greater than 10 years of age. 2) The male to female ratio was 2.0 : 1 with 90 male ad 45 female patients. 3) The types of ingested foreign bodies were coins in 93 cases (68.9%), pin in 8 cases (5.9%), key-holder in 7 cases (5.2%), paduk stone in 7 cases (5.2%), finger ring in 4 cases (3.0%), and others. 4) Presenting symptoms were variable with dysphagia in 34 cases (25.2%), odynophagia in 12 cases (8.9%), vomiting in 10 cases (7.4%), poor oral intake in 5 cases (3.7%), and others. 5) Ingested foreign bodies were located in the esophagus in 105 cases (77.8%), stomach in 30 cases (22.2%). 6) Methods for the removal of ingested foreign bodies included 97 cases of endoscopic removal (71.9%), 23 spontaneous removals (17.0%). Endoscopic removals were underwent in 91 cases of 99 esophageal cases (91.9%) without serious complication, but 15 out of 21 stomach cases were removed spontaneously (71.4%). 7) Duration from ingestion to removal of foreign bodies ranged from 2hrs to 14days. Foreign bodies in all 23 cases of spontaneous removal were extracted within 2 weeks after its ingestion. 8) Endoscopic findings of patients with esophageal foreign bodies included 35 normal cases (38.5%) and 56 abnormal cases (61.5%) and those patients with gastric foreign bodies included 3 normal cases (42.9%) and 4 mucosal lesion cases (57.1%).

데스크탑 마이크로 성형시스템의 가진성형에 따른 동특성 연구

홍동표,고유곤,홍용,김현식,이재완 한국공작기계학회 2009 한국공작기계학회 춘계학술대회논문집 Vol.2009 No.-

In this study, a desktop forming system which enables hydro dynamic bearing forming was developed. It consists of power train system, frequency forming system, manufactured Die-set, and controller of desktop forming system. The desktop micro forming system is focused on a higher load capacity and a shorter forming time than conventional system. Therefore it was designed for power train capability and load condition of Ball Screw. Moreover, a Piezo actuator was installed to make accurate machining possible, however, the Piezo actuator generate noise and vibration. Thus we performed the analysis of dynamic characteristics through the experiment about developed system in order to reduce such problems and discuss the alternative methods.

소아 Graves병의 임상적 고찰

유재홍 충남대학교 의과대학 지역사회의학연구소 1996 충남의대잡지 Vol.23 No.2

The author reviewed 18 children with Graves' disease who were diagnosed at the Pediatric Department, Chungnam National University Hospital from September 1991 to August 1996 and analyzed the clinical manifestations, laboratory results, and relationship between the presence of antithyroid autoantibodies and response of short-term antithyroid medication. The results were as follows : 1) Among 18 cases, 16 cases were female and the ratio of male and female was 8:1. 2) The age distribution of patients ranged from 7 year to 14 year (mean : 11.9±2.2 year) and 15 of 18 patients(83.3%) of patients were more than 10 yeas of age. 3) The most common clinical manifestation at first visit was goiter, followed by palpitation, nervousness, exophthalmos, tremor, excessive sweeting, easy fatigability, weight loss, heat intolerance, cardic murmur, chest discomfort, excercise intolerance, increased appetite, facial flushing and insomnia in the descending order. 4) In the thyroid function test before antithyroid medication mean serum T3 level(5.5±1.9ng/ml). T4(19.7±4.2ug/dl) and Free T4(6.2±2.7ng/dl) were above normal range and TSH (0.06±0.04ulU/ml) was below normal range. 5) All cases of 18 patients (100.0%) were antimicrosomal antibody positive and 16 of 18 patients(88.9%) were antithyrogobulin antibody positive. 11 of 13 patients(84.6%) were TSH receptor antibody positive. 6) The results of thyroid function test were normalized in 12 of 18 patients(66.7%) after antithyroid medication for 3 months and in 14 of 18 patients(77.9%) after antithyroid medication for 6 months.

소아에서 인슐린의존성 당뇨병의 임상적 고찰

유재홍 충남대학교 의과대학 지역사회의학연구소 1996 충남의대잡지 Vol.23 No.2

Insulin dependent diabetes(IDDM) is a rare disease in children, but it will progress rapidly and falls into a diabetic ketoacidosis or coma. Unfortunately, the characteristics and prevalence rate of children with IDDM are not well known in Korea, and also its in cidence is rising rescently. From January 1987 to October 1996, 22 children with IDDM who were were diagnosed at the Pediatric Department, Chungnam National University Hospital were analyzed retrospectively. The results were as follows : 1) The highest age incidence was in the age group of 11-15 years, and male to female ratio was 1:1.75, and seasonal distribution showed two peak in Feburary and July. 2) Diabetic ketoacidosis was noted in 31.8% of IDDM patients on admission. 3) Ketoacidosis was noted in 7 patients, and the cardinal symptoms were polydipsia, polyuria, and altered consciousness. 4) Laboratory findings at the ketoacidosis showed hyperglycemia, hemoconcentration, severe metabolic acidosis, and higher level of HbAlc and lower level of C-peptide in ketoacidosis than in nonketoacidosis. 5) Complication in IDDM follow-up for 3 month to 9 years was diabetic ketoacidosis(7 cases). Many IDDM patients have suffered from ketoacidosis and they will have chronic complications such as cataract, nephropathy. Therefore we need of the further studies of IDDM on a national scales.

신생아에서 경유문 영양관 삽입 및 위치 확인에 초음파 촬영술의 유용성에 대한 연구

유재홍 충남대학교 의과대학 지역사회의학연구소 1994 충남의대잡지 Vol.21 No.2

Thirty-eight studies were performed on 30 patients to assess the use of ultrasonography in determining the placement of the tip of the feeding tube at nursery department of Chungnam National University Hospital from Mar 1994 to Nov 1994. In 35 studies(92%) allowed to localize tube tips in these cases by visualizing microbubbles and tubes. In 3 studies, sonogram were unable to determine the location of the tip because it was twisted in antrum of stomach. In 28 studies showed microbubbles or tubes in a location beyond the pylorus. Ultrasound-guided placement was performed eight times on 5 patients. Five tubes(62.5%) were successfully passed to a transpyloric location. The use of ultrasonography in determing and guiding the placement of transpyloric tube feeding is feasible and offers certain advantages over conventional radiography. These include beside placement, enhanced ability to locate the tube relative to the pylorus, no exposure to ionizing radiation. This technique can be easily applied in neonatal and pediatric intensive care units in which an ultrasound machine is readily available.

暗渠排水에서 Grove의 公式에 關한 考察

周載洪,李裕根 진주산업대학교 1979 論文集 Vol.17 No.-

Grover's formula had played an important role to develop the theory for descent of the undergroundwater level in the underdrainage. Fall velocity of the underground water level gives a big effect to the cultivation of crops in the wet land. As a result of Grover's theory into pratice, Dr Yamazaki Hujio had found that was a big error. As applicating in experiment plots to Grover's fomula, obtained results are as follows. 1. As you see in the table(1), the result of experiment of Dr Yamazaki Hujio was existent higher value of v than the result of Grover's fomula. The result of fomula(Yc=127e-0.0496t) which resolved to apply a big value of v is existent a calculation mistake. it has been found a phenomenon that the water go not down into the underground, conversely going up. 2. As you see in the table(1),(2),(3) compared with Grover's fomula(1),(2) the value of y_c is a big error in regard to the value of t. 3. As you see in the table(3), (4) the result of applicating in my experiment plots, Grover's fomula is approximate with regard to the actual value.

Polaron Hopping in the K_(2)O · B_(2)O_(3) · V_(2)O_(5) Glasses

차유정,강재필,홍성덕,김복수,김영훈,서용문,송승기 명지대학교 자연과학연구소 2005 자연과학논문집 Vol.24 No.-

K_(2)O · B_(2)O_(3) · V_(2)O_(5) 계 유리의 조성비에 따른 밀도, 굴절율, 전이온도, 천이금속이온비율 등과 직류 전기 성질을 100~450K 온도영역에서 연구하였다. 실험결과를 비정질 반도체에 관한 전기전도에 대한 이론 모델을 이용하여 분석하였다. 고온 영역에서는 직류전도도의 온도 의존성을 Mott의 포논-도움껑충뛰기 전도모델로 분석할 수 있었다. 활성화에너지는 0.28~0.33 eV로 시료내 V_(2)O_(5) 의 양이 증가할수록 감소하는 경향을 보인다. 저온 영역에서 직류 전기전도도는 Mott의 가변거리 껑충뛰기(variable-range hopping)전기전도도와 잘 일치하며, N(E_(F))값은 국지화 상태에서와 같다. The dc conductivity of K_(2)O-B_(2)O_(3)-V_(2)O_(5) glasses has been investigated in the temperature range 100~450K and physical parameters such as density, refractive indices, glass transition temperature and fraction of reduced transition-metal ion, were observed for various compositions. The experimental results are analyzed with reference to theoretical models proposed for electrical conduction in amorphous semiconductors. The analysis shows that at high temperature region the temperature dependence of the dc conductivity is consistent with Mott's model of phonon-assisted hopping of small polarons. The values of activation energy are 0.28~0.33 eV and decrease with increasing V_(2)O_(5) content in the sample. The lowtemperature dc conductivity data can be well fitted to Mott's variable-range hopping conductivity and the values of N(E_(F)) are also reasonable for localized states.