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이상일(Sang-Il Lee),이상득(Sang-Deuk Lee),이영호(Young-Ho Lee),남청도(Chung-Do Nam),조권회(kwon-Hae Cho),김유택(You-Taek Kim) 한국마린엔지니어링학회 2006 한국마린엔지니어링학회 학술대회 논문집 Vol.2006 No.-
Pumps have been widely used for transporting fluid in most of the merchant ships. However, the present status of using pumps for marine vessels has not been studied. This paper is to classify and analyze pumps installed in many ships(LNGC, Oil Tanker, Bulk, Container, Training ship). Finally, Pumps installed in the training ships are compared with merchant ships about the present status of using pumps.
Jung-Whan Park(박정환),Yoon Kim(김윤),Woo-Jin Kim(김우진),Seung-Joo Nam(남승주) 한국컴퓨터정보학회 2021 韓國컴퓨터情報學會論文誌 Vol.26 No.3
위내시경 촬영은 조기에 위 병변을 진단하기 위해서 주로 사용한다. 하지만 위내시경을 했음에도 불구하고 위 내부를 자세히 관찰하지 못해서 10~20% 위 병변을 놓치는 경우가 생기는 것으로 보고되고 있다. 미국, 영국, 일본 등의 일부 국가와 세계내시경협회(Wold Endoscopy Organization)에서는 위내시경 시에 맹점 없는 관찰을 위해서 반드시 촬영해야 할 부위에 대한 촬영지침을 제안한 바 있다. 이에 본 논문에서는 수련의가 내시경을 하는 데 있어 위 내부를 자동으로 맹점 없이 관찰하는데 필요한 딥러닝 기술인 해부학적 분류모델을 제안한다. 제안한 모델은 위내시경 이미지에 적합한 전처리 모듈과 데이터 증강 기술들을 사용한다. 실험결과를 통해 최대 F1 점수 99.6% 분류 성능을 확인하였다. 또한, 실제 데이터를 통한 실험결과에서도 에러율이 4% 미만을 보였다. 이러한 성능을 바탕으로 설명 가능한 모델임을 보여 임상에서의 사용 가능성을 확인하였다. Esophagogastroduodenoscopy is a method commonly used for early diagnosis of upper gastrointestinal lesions. However, 10-20 percent of the gastric lesions are reported to be missed, due to human error. And countries including the US, the UK, and Japan, the World Endoscopy Organization (WEO) suggested guidelines about essential gastrointestinal parts to take pictures of so that all gastric lesions are observed. In this paper, we propose deep learning techniques for classification of anatomical sites, aiming for the system that informs practitioners whether they successfully did the gastroscopy without blind spots. The proposed model uses pre-processing modules and data augmentation techniques suitable for gastroscopy images. Not only does the experiment result with a maximum F1 score of 99.6%, but it also shows a error rate of less than 4% based on the actual data. Given the performance results, we found the model to be explainable with the potential to be utilized in the clinical area.
도파민 길항제에 치료 불응성인 기능성 소화불량증 환자에서 시사프리드의 효과
이상인(Sang In Lee),서원태(Won Tae Seo),박인서(In Suh Park),이용찬(Yong Chan Lee),이동기(Dong Gi Lee),이광재(Kwang Jae Lee),김도영(Do Young Kim),신용운(Yong Woon Shin),김영수(Young Soo Kijm),김범수(Pum Soo Kim),김동기(Dong Kee Kim) 대한소화기기능성질환·운동학회 2000 Journal of Neurogastroenterology and Motility (JNM Vol.6 No.2
N/A Background/Aims : Prokinetics are commonly used for the treatment of functional dyspesia, but their methods of action are different. First, we compared the efficacy and safety of the dopamine receptor antagonists, which were domperidone maleate and levosulpiride, in a 2 week treatment in functional dyspepsia, then investigated the efficacy and safety of cisapride tartrate in a 2 week treatment in those who were resistant to domperidone maleate or levosulpiride. Methods : One hundred Forty-nine patients, who were diagnosed with functional dyspepsia, were selected. The subjects were randomly divided into two groups, domperidone maleate (75) and levosupiride (74). Daily they took 30mg of domperidone maleate (DOM) or 75mg of levosulpiride (LEV) for 2 weeks. Then the subjects who didn't respond to these treatments took 30mg of cisapride tartrate for the following 2 weeks. Results : At week 0, the total symptom scores of the DOM group and LEV group were 8.01±2.57 and 8.14±2.65 respectively, which were not statistically different. At week 2, the total symptom scores of the DOM and LEV groups were significantly reduced to 4.28±3.30 and 4.85±3.53(p=0.0001). The efficacy rates of the DOM and LEV groups at week 2 were 50.8% vs. 44.1%. The rate of adverse events in the LEV groups was much higher than in the DOM group(17.7% vs. 8.0%). In addition the rate of change from normal to abnomal in prolactin level was markedly higher in the LEV than that of the DOM group(80.0% vs. 8.3%). After 2 weeks of treatment with cisapride tartrate, the total symptom score was significantly reduced to 3.77±2.49(p=0.0001), and the efficacy rate was 75.0%. The satisfaction of the resistant subjects in efficacy of cisapride compared with the previous treatment was 73.3%. The rate of adverse events of cisapride tartrate was 5.0%. Conclusions: Considering efficacy and safety of domperidone maleate and levosulpiride, domperidone maleate was the safer drug for the treatment of functional dyspepsia, and cisapride tartrate can be a useful drug in those patients who are resistant to dopamine antagonists like domperidone maleate and levosulpiride.
영어 학습 능력 증진을 위한 심리구조모형 개발 및 적용연구
이상도(Lee, Sang Do) 팬코리아영어교육학회(구 영남영어교육학회) 2015 영어교육연구 Vol.27 No.3
The purpose of this study is to develop the psychological structural modeling for the improvement of the English learning proficiency of university students. In order to achieve this aim, the learning models based on learning cognitive, learning procedure and learning result are made. Data were obtained from the questionnaires of 289 university students. This study shows that the learning procedure(learning flow, learning motivation, cognitive strategies) has a significant influence on the academic achievement. The result of this survey is as follows. First, there is the high positive correlation between learning cognitive and learning procedure. Second, learning result is the predictor of the subordinate factors of learning procedure such as learning flow, learning motivation, and cognitive strategies. This result can help us make a positive psychological structural modeling for university students.
공기역학자료를 이용한 한국어와 영어 비음에 대한 음성학적 연구
이상도(Lee Sang-Do),김수정(Kim Soo-Jung) 새한영어영문학회 2007 새한영어영문학 Vol. No.
This study examines phonetic realizations of nasals in English and mainly in Korean by using nasal airflow data. Though processes related to nasal sounds are the most common phenomena in Korean, such as consonant nasalization, n-insertion, lateralization, initial denasalization, most of the previous research on nasals were conducted in terms of phonological approaches. Even in phonetic studies, data were mostly analyzed using spectrogram. Given the fact that nasals display vowel-like formants and those in themselves are coupled with vowels, this study takes an aerodynamic approach based on nasal flow trace data. Nasals in different environments and their influences on neighboring vowel sounds were investigated. First, in Korean nasal lengths in three different positions were compared. The experimental results show that word-final nasals are the longest and, among the nasals in onset positions, word initial nasals were shorter than word-medial ones. In comparing nasals in Korean with those in English, an astonishing fact was revealed. The vowel nasalization rates of anticipatory and carryover nasalization in English were opposite to those in Korean. Specifically, the vowel nasalization rates of anticipatory and carryover nasalization in English were 77% and 47%, respectively; 46% and 92% in Korean. Moreover, the vowel nasalization rate affected by word-initial nasals was reduced. In another word, vowels preceeded by nasals gets nasalized less word-initially.
이상도(Sang Do Lee),유철규(Chul Gyu Yoo),한성구(Sung Koo Han),심영수(Young Soo Shim),김건열(Keun Youl Kim),한용철(Yong Chol Han),김영환(Young Whan Kim),조승열(Seung Yull Cho) 대한내과학회 1989 대한내과학회지 Vol.37 No.1
N/A Pulmonary paragonimiasis is a chronic lung disease caused by trematodes of the genus Paragonimus. It was highly endemic in Korea until the late 1960s; thereafter the prevalence has been markedly decreased. However, human paragonimiasis is still occurring and is one of the lung disease which needs differential diagnosis. This study was undertaken to renew our knowledge of the recent characteristics of pulmonary paragonimiasis in Korea by reviewing 76 patients diagnosed during the past 10 years (1979-1988) at Seoul National University Hospital (SNUH). The final diagnosis was based on either egg detection or positive serologic test by ELISA for Paragonimus-specific antibody (IgG) in serum. Chronic cough, blood-tinged sputum, dyspnea and chest pain are major presenting symptoms. In 6 patients, however, no subjective respiratory symptoms were shown; they were found during a routine chest X-ray examination. In half of all patients it took more than 6 months to obtain the correct diagnosis. The majority of previous misdiagnosis was pulmonary tuberculosis, but lung cancer, acute bronchitis, eosinophilic granuloma, etc were also suspected. When the results of egg detection and ELISA were compared, the sensitivity of the serologic test was 92%. The antibody titer by ELISA tended to return to its normal range in 6 months to 1 year after praziquantel treatment. This result warrants the differentiation of old cured paragonimiasis from the active disease which is frequently impossible by the intradermal test. Probably because we adopted ELISA results in the final diagnosis, pleural involvement constitutes a higher percentage (71%) in our series than in previous reports. It was found that paragonimiasis should be ruled out in patients with simultaneous bilateral hydropneumothorax. By praziquantel treatment, immediate improvement of the presenting symptoms was obtained in all but 4 patients in whom relapse reguired retreatment. Improvement in the findings on chest X-ray was delayed. The above results show that suspicion of paragonimiasis is very important for correct etiologic diagnosis as with other uncommon infectious diaeases which need specific chemotherapy.
이상도 ( Sang Do Lee ),정우섭 ( Woo Seop Jung ) 글로벌영어교육학회 2001 Studies in English education Vol.6 No.2
The growth of the Internet is bringing many changes to English education. There are many beneficial factors in teaching English through the Internet. The Internet allows students to use lots of information and resources with multiple sites networked. It can stimulate students` learning motivation and interest, and improve their problem solving ability. So, the Internet provides students and teachers with lots of opportunities in the field of English education. In using the Internet, there are also several disadvantages. First, students with a lack of computer skills might have technical problems. Second, English has become the main language of the Internet, so students with low reading and writing proficiency in English might find it difficult to be motivated in a class. Many researchers have proved that as we move into the 21st century, using the Internet is indispensable and become increasingly important in English education. Therefore, it is necessary that English teachers change their roles and attitudes in teaching English through the use of the Internet.
고진공 화학증착법으로 증착된 비정질 실리콘 박막의 저온 고상결정화에 관한 연구
이상도(Sang-Do Lee),김형준(Hyoung-June Kim) 한국진공학회(ASCT) 1995 Applied Science and Convergence Technology Vol.4 No.1
LCD용 다결정 실리콘 TFT의 제조에 요구되는 고품위의 다결정 실리콘 박막을 600℃ 미만의 저온 공정으로 제조하는 기술로 비정질 박막의 고상 결정화(solid phase crystallization)가 유망하다. 본 연구에서는 고진공 화학증착기를 이용하여 증착된 비정질 실리콘 막의 고상 결정화 거동에 대해 연구하였다. 고상 결정화 속도 및 결정화 후의 결정성(결정립 크기 및 결함 밀도)은 화학증착시의 증착가스의 종류(SiH₄ 혹은 Si₂H_6), 공정 압력, 증착 온도 등에 민감한 영향을 받으며, Si₂H_6 가스의 사용, 증착 압력의 증가 증착 온도의 감소는 최종 결정립의 크기를 현저히 증가시킨다. 또한 증착전의 기초 진공도를 높임으로써 반응기 잔류 가스에 의한 산소나 탄소 등의 막내 유입이 감소되어 결정화 속도가 증가하고 결정성이 향상되었다. Soid Phase Crystallization(SPC) of amorphous silicon films is important as a technology for obtaining device-quality polycrystalline silicon films required for LCD poly-Si TFTs through low temperature processes (<600℃). In this study, characteristics of SPC of silicon films deposited by high-vacuum CVD system were investigated. The rates of SPC and resulting crystallinity(grain size or defect density) after SPC were affected by gas species(SiH₄ vs Si₂H_6), deposition pressure, deposition temperature. Use of Si₂H_6 gas, increase of pressure, lowering of deposition temperature greatly increase the final grain size after SPC. Also, lowered base pressure before deposition increases the SPC rates as well as crystallinity, probably through lowering the incorporation of residual impurities(O, C) into silicon films.