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.

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.

Phage Display 기법을 이용한 B형 간염 바이러스 Polymerase의 Rnase H 활성을 억제하는 인간 단세포군 항체의개발

이성락,송은경,정영주,이영이,김익중,최인학,박세광 Official Journal of the Korean society for immunol 2004 Immune Network Vol.4 No.1

Clinical and radiological findings in community-acquired pneumonia: A comparison between viral and bacterial infection

Jin Young An, Young Rak Choi, Heo Won Jung, Young-Ki Choi, Si-wook kim, Ki Man Lee, Kang Hyeon Choe 충북대학교 동물의학연구소 2013 Journal of Biomedical and Translational Research Vol.14 No.3

Effective treatment for community-acquired pneumonia (CAP) requires administration of appropriate empirical therapy based on etiologic, clinical, and radiological features. However, in Korea, CAP is poorly characterized, and data on viral CAP are particularly sparse. Therefore, improper use of antibiotics is common, and is detrimental the potential for development of bacterial. Thus, we investigated clinical and radiological findings for discrimination of viral CAP from bacterial CAP. Etiologic, clinical, and radiological data from 467 patients with CAP at Chungbuk National University Hospital from October 2010 to September 2011 were analyzed retrospectively. Viruses were identified in 23 cases (11.4%); the influenza virus A was the most common virus detected (N=18, 25.4%), followed by the respiratory syncytial virus A (N=14, 17.9%). Bacteria were identified in 48 cases (23.8%); Streptococcus-pneumonia was the most common (N=24, 25.5%), followed by Staphylococcus aureus (N=20, 21.3%). Depending on hospitalization time, the following significant differences were observed between viral and bacterial CAP: on admission, (1) high fever (≥ 38.5°C), (2) purulent sputum, (3) white blood cell count, (4) Creactive protein levels, (5) and bilateral lung involvement on chest X-ray were higher in bacterial CAP; and at discharge, (1) duration of high fever and (2) radiologic improvement within three days were higher in viral CAP. Regarding seasonal patterns, both viruses and bacteria have been identified with relative frequency in the winter season. This study described the etiological, clinical, and radiological findings of viral and bacterial CAP. Conduct of additional largescale, prospective investigations will be required in order to improve the appropriate treatment of CAP.

Poster Session:PS 0250 ; Gastroenterology : The Progression of Cholelithiasis Presenting in Recurrent Stress Induced Cardiomyopathy : A Case Report

( 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.

Invasive Aspergillosis Involving the Lungs and Brain after Short Period of Steroid Injection: A Case Report

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.

Metastatic Renal Cell Carcinoma in a Supraclavicular Lymph Node with No Known Primary: A Case Report

Young-Rak Choi,한혜숙,이옥준,Sung-Nam Lim,Mi-Jin Kim,Myeong-Ho Yeon,전현정,이기형,김승택,지미정 대한암학회 2012 Cancer Research and Treatment Vol.44 No.3

Although metastasis is relatively frequent in cases of renal cell carcinoma (RCC), metastasis in the cervical or supraclavicular lymph node (LN) is relatively rare. Moreover, cases of metastatic RCC with a non-identifiable kidney mass are extremely rare. Here, the authors report a case of metastatic RCC in a supraclavicular LN without a primary kidney lesion. A 69-year-old man presented with a progressively enlarging right supraclavicular mass. Incisional biopsy of the affected supraclavicular LN was performed, and histological examination revealed metastatic RCC. However,no tumor was found in either kidney, despite various examinations. The patient was treated with radiotherapy followed by sunitinib. After three months on sunitinib, a follow-up computed tomography scan revealed that the supraclavicular LN had markedly decreased, and after 20months, the disease had not progressed. This case suggests that, even when there is no primary kidney lesion, clinicians must consider the possibility of metastatic RCC when evaluating patients with clear cell carcinoma with an unknown primary site.

Identification of Non-Muscle Nebulin Isoform in Human Brain Library

Young Mi Joo,Min-A Lee,Pyung-Rak Choi,Jae-Kyoung Choi,Yeong-Mi Lee,Su-Il Choi,Myong-Shin Kim,Eun-Hee Jeon,So-Young Kim,Chong-Rak Kim 대한의생명과학회 2004 Biomedical Science Letters Vol.10 No.1

Nebulin is a (Mr 600~900 kDa) large actin-binding protein specific to skeletal muscle and thought to act as a molecular template that regulates the length of thin filaments. Cardiac muscles of higher vertebrates have been shown earlier to lack nebulin. Recently, full-length nebulin mRNA transcripts have been detected in heart muscle, but at lower levels than in skeletal muscle. Nebulin expression also was detected in the kidney, eye, and otic canal, suggesting that nebulin isoforms may also be expressed in these organs. We have searched for nebulin isoforms in brain of human using PCR and Northern blot. Here, we provide evidence that nebulin mRNA transcripts are expressed in brain. Seven nebulin isoforms (B, C, D, E, F, G and H form) are obtained in human skeletal muscle and four isoforms (B, C, G and H form) in human brain cDNA library. We cloned the 1.3 kb of nebulin fragment from human adult brain library by PCR. The identity of the PCR product was confirmed by sequence analysis. The partial brain nebulin sequence was 99% identical to the skeletal muscle cDNA as determined by Blast alignment. It contains two simple-repeats HR1, HR2 and linker-repeats exon 135~143 except exon 140. It was different from skeletal muscle B form, which contain HR1 and HR8. These data suggest that nebulin isoform diversity occurs even more extensively than previously known, likely contributing to the distinct thin filament architecture of different striated muscles.

Metastatic renal cell carcinoma in a supraclavicular Lymph node without an identifiable primary tumor

Young Rak Choi,Hye Suk Han,Ok Jun Lee,Ki Hyeong Lee,Seung Taik Kim 대한내과학회 2009 대한내과학회 추계학술대회 Vol.2009 No.-

Poster Session : PS 1578 ; Bronchoscopy : Massive Hemoptysis After Bronchoscopic Biopsy in Endobronchial Tuberculosis Patients: Two Cases Reports

( 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.