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- 저자 : Young-Rak Choi (검색결과 393 건)
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4*(M/M/1)시스템에서 로컬 및 글로벌 실시간 처리를 위한 스케줄링 알고리즘의 시뮬레이션 분석
최용락,윤희환 대전대학교 기초과학연구소 1990 自然科學 Vol.1 No.-
본 논문은 동종의 프로세서로 구성된 분산처리 시스템에서 엄격한 실시간 처리제한을 갖는 정기적 프로세스의 로컬 스케줄링 및 비정기적 실시간 처리 프로세스와 일반 프로세스의 글로벌 스케줄링 알고리즘에 대한 시뮬레이션 성능 분석을 하였다. 시뮬레이션 결과 로컬의 정기적 실시간 프로세스에 대한 deadline이전 처리를 100% 보장하면서 글로벌 스케줄링을 수행함으로써, 비정기적 실시산 프로세스이 deadline miss ratio가 명백히 감소하였고, 시스템 전체에 대한 load imbalance 및 response time이 개선됨을 보였다. This paper presents a scheduling algorithm for processes with hard real-time constraints which works dynamically in loosely-coupled distributed systems. It includes scheduling problems to guarantee periodic and non-periodic processes with execution deadlines, and it also takes account into preemption, overhead due to scheduling, and the effect of normal processes without strict time constraints. The results of simulation show that this algorithm reduce deadline miss ratio, average response time, and root mean square difference in work load substantially.
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공업고등학교에서 전자의 기초 이론 학습을 위한 WBI 개발 및 그 학습효과에 관한 연구
최완식,박락영 충남대학교 공업교육연구소 1999 論文集 Vol.22 No.1
The major purposes of this study were: (a) to develop a WBI on the basic teaming of 'electron', (b) to determine if learning effect with the WBI is better than the learning effect with the traditional instruction, (c) to identify whether there is different learning effect between the WBI group with left-menu and the group with right-menu, and (d) to identify whether the students who had learned the lesson(electron subject in the technical high school) with the WBI show better learning attitude on the lesson than the students with the traditional instruction do. Followings were the major findings of this study. (1) The students who had teamed the lesson with WBI showed statistically higher learning abilities of the lesson than the students teamed through the traditional method did. (2) In the WBI experimental groups, the scores obtained just after the lesson had no difference between the WBI group with right-menu and the WBI group with left-menu, but the scores obtained after one week were statistically higher in the WBI group with right-menu than the group with left-meun. (3) In a sense of an average score of the attitude, the students who had learned the lesson with WBI had higher attitude scores than the students learned through the traditional method had. (4) In the WBI experimental groups, there was no difference in the learning attitudes between left-menu group and the right-menu group.
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( Young Rak Choi ),( Joung Ho Han ),( Mi Jin Kim ),( Hee Bok Chae ),( Seon Mee Park ),( Sei Jin Youn ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Cholelithiasis is the most common of the biliary tract diseases and often manifested as cholecystitis or cholangitis. The symptoms vary from symptomless, typical right upper abdominal pain, jaundice, fever, and vomiting. As old age quite often combined with underlying diseases and atypical symptoms, it is diffi cult to make an exact early diagnosis. Especially when gallstone is passed out or small in size, in other words, if diffi cult to be identifi ed by radiology, it is also diffi cult to fi nd causes of pain despite repeated testing. A 66-year-old man was rushed to the emergency room due to severe chest pain with labored respiration and treated with medication under the diagnosis as cardiomyopathy with unclear causative factors. Abdominal ultrasound and liver function test observed no clear abnormal findings. After then, he repeated being hospitalized and discharged from the hospital for the same symptoms and when he visited the emergency room the third time, cholelithiasis was identifi ed as cause of recurrent stress induced cardiomyopathy. All of his symptoms improved after removing common bile duct stone with endoscopic retrograde cholangiopancreatography and later did not recur. Thus, when diagnosing elderly patients for chest pain, careful approach is required in various ways and if symptoms are repeated, it is necessary to take appropriate examinations of accurate cause even after treatment and suspect continuously. In particular, considering that progression of cholelithiasis might be the causative factor of recurrent stress induced cardiomyopathy will be of great help for exact differential diagnosis.
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( Young Rak Choi ),( Mi Jin Kim ) 대한결핵 및 호흡기학회 2014 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.118 No.-
Endobronchial tuberculosis is known as a specific form or complication of pulmonary tuberculosis. It is often initially confused with diseases such as bronchial asthma or lung cancer. Among the subtypes of endobronchial tuberculosis, a tumorous type is often difficult to differentiate from lung cancer in some cases. Therefore, a biopsy should be needed to confirm and differentiate the diagnosis. But, fatal adverse events can be occurred during biopsy. Here, we report two cases of the massive hemoptysis after bronchoscopic biopsy in patients of endobronchial tuberculosis which had been suspected of lung cancer. A 81-year-old female patient was admitted to the emergency room due to about 200cc of hemoptysis had occurred the day of admission. A flexible bronchoscopy was performed, and about 1 x 1cm sized polypoid mass was observed at entrance of upper division of the left upper lobe. Immediately after the biopsy, massive bleeding occurred. The patient was treated for hypoxic brain damage and hospital acquired pneumonia, but expired. The biopsy results were compatible with EBTB. ; A 72-year-old female patient visited the emergency room due to about 100cc of hemoptysis that had occurred the day of admission. A flexible bronchoscopy was performed and revealed about 1 x 1cm sized polypoid mass at the entrance of upper division in the left upper lobe. A biopsy was performed, and immediately massive hemorrhage occurred. Even though CPCR was performed, she expired due to hypovolemic shock. Subsequent biopsy results confirmed EBTB. The differential diagnosis of tumorous type of endobronchial tuberculosis and lung cancer is commonly encountered and is very important in clinical practice. Physicians should be keep in mind procedure related complications and prepare management for the control of unpredicted complications including massive hemoptysis.
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( Young Rak Choi ),( Jeong Tae Kim ),( Jeong Eun Kim ),( Heo Won Jung ),( Kang Hyeon Choe ),( Ki Man Lee ),( Jin Young An ) 대한결핵 및 호흡기학회 2012 Tuberculosis and Respiratory Diseases Vol.72 No.5
Invasive pulmonary aspergillosis (IPA) has emerged as a severe infection in patients with immunocompromised hosts. However, recently, several IPA cases, without an apparent predisposition to immunodeficiency, has been reported. A 72-year-old woman was admitted for evaluation of general weakness and poor oral intake. She reported no medical history, except for intraarticular injection of a corticosteroid for joint pain for the duration of two months. A chest radiography revealed multiple cavitary nodules in both lungs. Examination of specimens, obtained by percutaneous needle biopsy, led to a diagnosis of invasive aspergillosis. Brain magnetic resonance imagining revealed numerous peripheral thin enhancing cystic nodules in both cerebral hemispheres. We initiated intravenous administration of amphotercin B. However, the patient died after nine days. Here, we report an invasive aspergillosis case, which involves the lungs and brain after a short period of steroid injection.
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( Young Rak Choi ),( Mi Jin Kim ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Endobronchial tuberculosis is known as a specifi c form or complication of pulmonary tuberculosis. It is often initially confused with diseases such as bronchial asthma or lung cancer. Among the subtypes of endobronchial tuberculosis, a tumorous type is often diffi cult to differentiate from lung cancer in some cases. Therefore, a biopsy should be needed to confi rm and differentiate the diagnosis. But, fatal adverse events can be occurred during biopsy. Here, we report two cases of the massive hemoptysis after bronchoscopic biopsy in patients of endobronchial tuberculosis which had been suspected of lung cancer. A 81-year-old female patient was admitted to the emergency room due to about 200cc of hemoptysis had occurred the day of admission. A fi exible bronchoscopy was performed, and about 1 x 1cm sized polypoid mass was observed at entrance of upper division of the left upper lobe. Immediately after the biopsy, massive bleeding occurred. The patient was treated for hypoxic brain damage and hospital acquired pneumonia, but expired. The biopsy results were compatible with EBTB. ; A 72-year-old female patient visited the emergency room due to about 100cc of hemoptysis that had occurred the day of admission. A fi exible bronchoscopy was performed and revealed about 1 x 1cm sized polypoid mass at the entrance of upper division in the left upper lobe. A biopsy was performed, and immediately massive hemorrhageoccurred. Even though CPCR was performed, she expired due to hypovolemic shock. Subsequent biopsy results confirmed EBTB. The differential diagnosis of tumorous type of endobronchial tuberculosis and lung cancer is commonly encountered and is very important in clinical practice. Physicians should be keep in mind procedure related complications and prepare management for the control of unpredicted complications including massive hemoptysis.
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Choi, Young-Rak,Kim, Jeong-Tae,Kim, Jeong-Eun,Jung, Heo-Won,Choe, Kang-Hyeon,Lee, Ki-Man,An, Jin-Young The Korean Academy of Tuberculosis and Respiratory 2012 Tuberculosis and Respiratory Diseases Vol.72 No.5
Invasive pulmonary aspergillosis (IPA) has emerged as a severe infection in patients with immunocompromised hosts. However, recently, several IPA cases, without an apparent predisposition to immunodeficiency, has been reported. A 72-year-old woman was admitted for evaluation of general weakness and poor oral intake. She reported no medical history, except for intraarticular injection of a corticosteroid for joint pain for the duration of two months. A chest radiography revealed multiple cavitary nodules in both lungs. Examination of specimens, obtained by percutaneous needle biopsy, led to a diagnosis of invasive aspergillosis. Brain magnetic resonance imagining revealed numerous peripheral thin enhancing cystic nodules in both cerebral hemispheres. We initiated intravenous administration of amphotercin B. However, the patient died after nine days. Here, we report an invasive aspergillosis case, which involves the lungs and brain after a short period of steroid injection.
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( Young Rak Choi ),( Jin Young An ),( Mi Kyeong Kim ),( Hye Suk Han ),( Ki Hyeong Lee ),( Si Wook Kim ),( Ki Man Lee ),( Kang Hyeon Choe ) 대한내과학회 2013 The Korean Journal of Internal Medicine Vol.28 No.6
Background/Aims: Real-time, convex probe endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is used for the staging of malignant mediastinal lymph nodes. We evaluated the diagnostic effi cacy and safety of EBUS-TBNA when used as an initial diagnostic tool. Methods: We retrospectively studied 56 patients who underwent EBUS-TBNA as an initial diagnostic tool between August 2010 and December 2011. Procedure purpose were classified into four categories: 1) intrathoracic masses adjacent to the central airway; 2) enlarged lymph nodes for concurrent diagnosis and staging in suspected malignancy; 3) enlarged lymph nodes in suspected malignancy cases with inability to perform percutaneous core needle biopsy (PCNB); and 4) solely mediastinal masses/lymph nodes in lieu of mediastinoscopy. Results: The diagnostic accuracy of EBUS-TBNA regardless of procedure purpose was calculated to be 83.9%. Furthermore, the diagnostic accuracy of malignant disease was significantly higher than benign disease (93.9% vs. 70.6%, p < 0.001). The diagnostic accuracy of EBUS-TBNA for each disease is as follows: tuberculosis, 50%; sarcoidosis, 60%; aspergillosis, 100%; lung abscess, 100%; lung cancer, 93%; and lymphoma, 100%. There were minor complications in seven patients during the EBUS-TBNA procedure. The complications included mild hypoxia and bleeding. Conclusions: In conclusion, EBUS-TBNA is a useful initial diagnostic tool for both benign and malignant diseases. EBUS-TBAN is also a very safe procedure and less invasive compared to mediastinoscopy or PCNB.
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