순환 신경망의 하드웨어 구현

김정욱(Cheong-Wook Kim),오종훈(Jong-Hoon Oh) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.1B

최근에는 순환 신경망의 생성모델이 비교사 학습에 관련하여 활발히 연구되고 있다. 이러한 형태의 신경망은 형태 추출이나 인식에 효과적으로 사용될 수 있는 반면 반복 loop를 사용하므로 대단히 많은 계산이 필요하다. 본 논문에서는 Oh와 Seung에 의해 제안된 상향전파(Up-propagation) network이라는 순환 신경망을 FPGA를 이용해서 구현하였다. 단층 신경망은 9개의 상층 neuron과 256개의 하층 neuron으로 구성되 있으며 4만 게이트의 FPGA 하나로 효과적으로 구현할 수 있다. pipeline된 곱셈기로 계산 속도를 향상시켰고 sigmoid 전달함수는 유한 정밀도의 2차 다항식으로 근사될 수 있다. 구현된 하드웨어는 hand-written 숫자 영상인 USPS data를 재생하는데 사용되었으며 좋은 결과를 얻었다.

비디오 흉강경을 이용한 자연기흉의 수술요법

권오춘,안욱수 대구효성가톨릭 대학교 1997 연구논문집 Vol.54 No.2

Primary spontaneous pneumothorax has an annual incidence of 9 cases per 100,000 populations, especially high incidence in young adults. Thoracoscopic surgery is not new, but its applications to chest surgery have been more increasing with advanced video technology and instrumentation. We performed 15 cases of bullectomy using video-assisted thoracoscopy(VATS) for patients of pneumothorax. The mean age of patients was 25.1±7.6 years old, 105.5±40.1 minutes of mean operation times, and 3.2±1.9 days of postoperative tube indwelling time. Postoperative complications were persistent air leakage in one case, which was converted to open thoracotomy later, and recurrence of pneumothotax in one case. Video-assisted thoracoscopic bullectomy is effective alternative to thoracotomy for treatment of pneumothorax in terms of short hospital stay, less morbidity, low rate of recurrence, less pain, and good cosmetic results. But objective comparison with mini-thoracotomy will be needed in many aspects.

Pinus koraiensis와 Pinus parviflora의 樹高에 따른 氣孔數 變異에 關하여

權五容,辛昌男,吳炅煥,方在旭 충남대학교 자연과학연구소 1980 學術硏究誌 Vol.7 No.2

Stomata1 distribution in relation to the height of Pinus parviflora and Pinus koraiensis was studied 1. Stomata1 bands per needle of P parviflora and P koraiensis were 8.60±0.62 - 11.47±0.74, 14.07±1.03 - 16.60±0.99 and the number of stomata per band were 382.0±8.80 404.27±26.16, 1,326. 67±87.78 - 2,286.58±214.57, respectively 2. The number of stomatal band was significantly different between 3, 4m and 5, 6m in P parviflora and between 5, 6m and 7m in P. koraiensis Consequently, it is suggested that stomatal frequency gradient associated with increasing height above the ground is correlated with the greater degree of exposure to light.

자돈에 있어 게르마늄 용질액의 급여가 성장 및 혈액학적 변화에 미치는 영향

홍종욱,권오석,민병준,조진호,진영걸,손경승,강종옥,김인호 한국국제농업개발학회 2004 韓國國際農業開發學會誌 Vol.16 No.4

본 연구의 목적은 이산화게르마늄을 함유한 게르마늄 용질액을 자돈에 급여하였을 때 성장 및 혈액학적 변화에 미치는 영향을 조사하기 위하여 실시하였다. 3원 교잡종 자돈 60두 (평균체중 11.22±0.10㎏)를 공시하였다. 시험설계는 옥수수-대두박 위주의 대조구(CON)와, 대조구 사료내 게르마늄 용질액을 0.5 ppm 첨가한 구(GC0.5) 및 대조구 사료내 게르마늄 용질액을 1.0 ppm 첨가한 구(GC1.0)로 3개 처리를 하였다. 0-10일간 사양시험기간동안, 일당증체량에 있어서 GC0.5 처리구가 약간 높게 평가되었다(quadratic effect, P<0.02). 그러나 전체 시험기간동안, 일당증체량, 일당사료섭취량 및 사료효율에 있어서 처리구간에 유의적인 차이는 보이지 않았다. 영양소 소화율에 있어서는 GC0.5 처리구가 조회분(linear effect, P<0.01; quadratic effect, P<0.04), 칼슘(linear effect, P<0.01; quadratic effect, P<0.01), 인 (linear effect, P<0.02; quadratic effect, P<0.04) 소화율이 유의적으로 높게 평가되었다. 혈액내 neutrophil 농도에 있어서는 게르마늄 용질액의 첨가 수준이 증가함에 따라 유의적으로 증가하는 경향을 나타내었다(quadratic effect, P<0.02). 결론적으로, 자돈 사료내 게르마늄 용질액의 급여가 성장 및 혈액학적 수치에는 영향을 미치지 못하는 것으로 사료된다. This study was conducted to investigate the effects of dietary germanium colloid on the growth performance and hematological values in nursery pigs. Sixty pigs (11.22(0.10 ㎏ average initial body weight) were used in a 20 d growth assay. Dietary treatments included 1) CON (basal diet), 2) GC0.5 (basal diet+0.5 ppm germanium colloid) and 3) GC1.0 (basal diet+1.0 ppm germanium colloid). For d 0 to 10, pigs fed GC0.5 diet grew faster than pigs fed CON and GC1.0 diets (Quadratic effect, P<0.02). However, through the entire experimental period, no statistical differences were found for aver-age daily gain, average daily feed intake and gain/feed. Apparent digestibilities of crude ash (Linear effect, P<0.01; Quadratic effect, P<0.04), calcium (Linear effect, P<0.01; Quadratic effect, P<0.01) and phosphorus (Linear effect, P<0.02; Quadratic effect, P<0.04) in pigs fed GC0.5 diet were greater than for pigs fed CON and GC1.0. Neutrophil concentration in blood increased as the concentration of germanium colloid in the diets was increased with significant difference (Quadratic effect, P<0.02). In conclusion, growth performance and hematological values were not influenced by dietary germanium colloid.

금호강변 자갈의 종류와 그 주변에 분포하는 암석과의 관계

권오범,김중욱 大邱敎育大學校 科學敎育硏究所 1990 과학·수학교육연구 Vol.14 No.-

This study investigates the external characteristics and the distribution frequency of gravels at the beach of Kumho river. The gravels in external form can be classified to color, hardness, rock texture, feeling and shape with an naked eye according to the each original rocks. These external features of gravels in study area are controlled by the physical property formed by the genesis of each original rock. The distribution frequency of gravel numbers at the beach occurs in volcanic rock>sedimentary rock>contact metarmorphic rock>granitic rock in sequence. It is suggested that this distribution feature can be explained by the distribution area of provenance and the stability of physical weathering to each original rocks.

淸道川 변에 分布하는 자갈에 對한 調査硏究

權五範,金重旭 大邱敎育大學校 科學敎育硏究所 1989 과학·수학교육연구 Vol.13 No.-

An analysis of frequency distribution, indicates that gravels in the Ch'??ongdo stream are mainly consist of andesitic volcanic rocks, granite and quartz porphyry in frequency. This occurrence frequency of rock each is well matched with the distribution area of each rock in the geologic map from the present erosion level. Rock type of gravels can be classified into andesite, andesitic porphyry, breccia bearing andesite, quartz porphyry and tuff. The distribution of gravel size suggests that the occurrence frequency of boulder and cobble is systematically changed toward the downstream, whereas that of pebble is randomly changed. The roundness of gravel is distinctly changed and is higher in the downstream site than in the upperstream site. The occurrence of angular gravel is relatively dominant than that of rounded gravel. This doninant angular gravel is due to either the poor current quantity of stream or the rocks transported from the near provenance of rocks. The geological material discussed here are recommended as the learning material for the observation and classification of gravels in 'rock and soil' unit of science textbook.

첫 입원치료 받은 정신분열병 환자들의 삶의 질 추적 연구

한오수,이철,최지욱,홍진표,김창윤 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.6

울산의대 서울중앙병원 정신과에서 첫 입원 치료를 받고 퇴원하여 2년 혹은 5년이 경과한 정신분열병과 기타 정신병 108명 중 최종 73명(응답을 66%)을 대상으로 Heinrichs등이 고안한 삶의 질 척도(Quality of Life Scale)를 사용하여 현재의 삶의 질을 평가하여 다음과 같은 결과를 얻었다. 첫째, 삶의 질 측면 4가지 측면인 대인관계, 직업적 역할, 정신내적 요소, 및 일상적인 물건 및 행동 모두에서 삶의 질이 전반적으로 저하되어 있음을 관찰할 수 있었다. 대인 관계 영역 중 가족 구성원과의 인적 관계 항목은 다른 항목에 비해 상대적으로 만족도가 높았다. 둘째, 정신분열병군의 삶의 질은 기타 정신병군에 비해 대부분의 삶의 질 항목에서 유의하게 낮은 것으로 나타났다. 셋째, 2년 경과군과 5년 경과군 사이 삶의 질은 유의한 차이를 보이지 않았다. 발병 초기 삶의 질 저하가 상당기간 유지됨을 시사하였다. 넷째. 퇴원 후 삶의 질에 영향을 미치는 변인으로는 첫 입원 치료 기간이 유의한 역상관관계를 보였으며 또한 다변량 회귀 분석에 있어서도 같은 결과를 보였다. 이는 초기 치료에 대한 반응 정도가 부분적으로는 향후 삶의 질을 예측할 수 있음을 시사한다. 기타 첫 입원 당시의 연령, 교육 수준. 사회경제적 수준, 첫 입원하기까지의 이환 기간, 첫 입원 당시 Global Assessment of Functioning 입원 치료시 약물용량 등은 삶의 질과 유의한 상관관계를 보이지 않았다. Objectives : One object of this study is to provide a descriptive level of qua1ity of life(QOL) in a group of the first admired schizophrenic patients through interviews being performed after two or five yeah of fo11ow-up, and comparing them with patients in psychotic disorders other than schizophrenia. Another object is to identify clinical variables on the first admission which correlate to QOL factors, after two or five years of fo11ow up. Methods : A total of 73 subjects of the first admitted patients with schizophrenia(n=57) and psychotic disorders other than schizophrenia(other psychotic disorders group, n= 16) were selected. A Quality of Life Scale(QLS) measuring 21 items of life variables was used. Demographic and psychiatric data were obtained through medical records and psychiatric interviews. Results : Schizophrenia group(n=57) showed moderate decrease(mean 3.7 of 6) in all aspect of quality of life. However, the schizophrenia group displayed a relatively high score in relations with household members(mean=5.2) only among 21 QOL items. Comparison to other psychotic disorders group(n= 16), schizophrenia group showed a significant decrease in almost all aspects of QOL. No significant difference was obtained between the 2 year(n=27) and the 5year(n= 30) group. Duration of the first admission showed a significant correlation with current quality of life in the schizophrenic group. Conclusions : The significantly decreased score of quality of life suggests the need for careful observation and therapeutic concern for the early stage of schizophrenia. The schizophrenic group's relatively high score in relations with household members in this period may provide the importance of rehabilitation to improve their quality of life. Duration of the first admission may be a useful predictor of their subsequent quality of life.

천연두 백신 접종 후 발생된 급성 심근염 1예

박옥성,김종환,이광욱,윤성훈,강동구,이승욱,조상기 朝鮮大學校 附設 醫學硏究所 2006 The Medical Journal of Chosun University Vol.31 No.2

Acute myocarditis complicating coronary vasospasm after smallpox vaccination is very rare complication that can be generally developed within less than 30 days after vaccination. Clinically and biochemically, this disorder is often mimic and highly suggestive of acute myocardial infarction. We report 21 years old man that had a history of a smallpox vaccination 3 weeks ago and prodromal symptoms(fever, malaise etc) a few days ago. hIe visited to our hospital because of abrupt onset of severe substernal chest pain, dyspnea and diaphoresis. At admission, electrocardiography was ST elevation in lead Ⅰ, aVL, V4, V5, and V6. The CK-MB level was 68 U/L, LDH level was 760 U/L, Troponin-Ⅰ was 24.64 ng/㎖, and Troponin-T was positive. 2D-echocardiograpy was normal left ventricular function, Clinically we presumed this disorder as acute myocardial infarction and we promptly performed the coronary angiography and revealed focal spasm in distal left coronary artery territory without critical stenosis in both coronary arteries. We diagnosed this disorder as coronary vasospam complicating acute myocarditis that is different with acute myocardial infarction, and we prescribed nitroglycerin and nifedipine. After discharge, he is now well without any symptoms and has been following up monthly at our outward department for 6 months.

자가면역 췌장염의 동반증상 없이 발생한 IgG4 연관 경화성 담관염

천송욱 ( Song Wook Chun ),최자성 ( Ja Sung Choi ),강버들 ( Beo Deul Kang ),김유진 ( Yu Jin Kim ),한기준 ( Ki Jun Han ),조현근 ( Hyeon Geun Cho ),오화은 ( Hwa Eun Oh1 ),조재희 ( Jae Hee Cho ) 대한소화기학회 2013 대한소화기학회지 Vol.62 No.1

IgG4-related systemic diseases are characterized by a diffuse or mass forming inflammatory reaction rich in lymphocytes and IgG4-positive plasma cells (lymphoplasmacytic infiltration), fibrosclerosis of variable organs and obliterative phlebitis. They usually involve various organs including the pancreas, bile duct, gallbladder, salivary gland, retroperitoneum, kidney, lung, and prostate. However, most of them are accompanied by autoimmune pancreatitis, and good response to steroid treatment is one of the hallmarks of this disease. We report a case of an 67-year-old man with IgG4 associated sclerosing cholangitis, who was diagnosed by endoscopic retrograde cholangiopancreatography and successfully treated with steroid therapy. (Korean J Gastroenterol 2013; 62:69-74)

베이스 구조물 진동을 고려한 스테이지 입력성형기법 적용에 관한 연구

김형기,권오영,배규현,홍성욱 한국공작기계학회 2008 한국공작기계학회 추계학술대회논문집 Vol.2008 No.-

A base structure which mounts positioning stages is often subjected to vibration due to the reaction force against the stage motions. This paper deals with an input shaping method for positioning stage in consideration of vibration base structures along with the stage vibration. A dynamic model is established to investigate the vibration of positioning stage and base structure. Two input shapers, a conventional input shaper and a new input shaper, are applied to eliminate both the residual vibrations in base structure as well as positioning stage. Simulations show that the input shaping methods effectively remove the residual vibrations.