신뢰성을 제공하는 효율적인 분산 파일 시스템

元裕憲,金鐘勳,安柔貞 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.2

Current network file system protocols rely heavily on a central server to coordinate file activity among client workstations. This central server can become a bottleneck that limits scalability for environments with large numbers of clients. In central server systems such as NFS and AFS, all client writes, cache misses, and coherence messages are handled by the server. To keep up with this workload, expensive server machines are needed, configured with high-performance CPUs, memory systems, and I/O channels. Since the server stores all data, it must be physically capable of connecting to many disks. This reliance on a central server also makes current systems inappropriate for wide area network use where the network bandwidth to the server may be limited. In this paper, we investigate the software RAID file system, writing data redundantly across an array of disks in each of the workstations on the network. By striping across enough disks, each workstation can appear to have disk bandwidth limited only by the network link bandwidth. Availability of a software RAID file system could be better than in other distributed file systems, because there is no central host to be a single point of failure. If one workstation crashes, any other can take its place in controlling the RAID. We present results from a trace-driven simulation study of the network file system protocol. We find that the software RAID file system improves the performance in the aspect of the av, age response time when compared with NFS protocol.

림프질 전이가 있는 하인두암과 하부식도암의 진단에 활용된 내시경초음파 유도하 Trucut 생검 1예

광명옥,이정환,문정섭,김유선,류수형,총배천,김형훈,김현태 仁濟大學校 白病院 2010 仁濟醫學 Vol.31 No.-

The incidence of double primary cancer is about 10% in all kinds of cancers. Double primary cancer is usually accompanied by gastrointestinal cancer. Esophageal cancer is supposed to be frequently accompanied by squamous cell carcinoma of the head and neck or the upper respiratory tract, because of such common carcinogens as smoking and alcohol ingestion. Esophageal cancer and hypopharyngeal cancer are usually diagnosed by esophagogastric endoscopy with biopsy. We performed endoscopic ultrasound-guided Trucut biopsy(EUS-TCB) to diagnose a mediastinal mass in a 49 year-old patient, who visited our hospital because of voice change. During procedure, we accidently found enlarged celiac lymph node, and obtained tissue from the mediastinal lymph node and the celiac lymph node. We confirmed double primary cancer of squamous cell carcinoma in the esophagus and the hypopharynx via esophagogastric endoscopy.

신경회로망에 의한 용접 결함 종류의 정량적인 자동인식 시스템 개발에 관한 연구

김재열,김영석,김병현,유신,김훈조,정진홍 한국공작기계학회 1997 한국생산제조학회지 Vol.6 No.1

A neural network approach has been developed to determine the depth of a surface breaking crack in a steel plate from ultrasonic backscattering data. The network is trained by the use of feedforward three-layered network together with a back-scattering algorithm for error correction. The signal used for crack insonification is a mode converted 70˚ transverse wave. A numerical analysis of back scattered field is carried out based on elastic wave theory, by the use of the boundary element method. The numerical data are calibrated by comparison with experimental data. The numerical analysis provides synthetic data for the training of the network. The training data have been calculated for cracks with specified increments of the crack depth. The performance of the network has been tested on other synthetic data and experimental data which are different form the training data.

Dimecron 중독증 환자 6예

류하근,박봉안,류주성,유재등,김정수,김치훈,송종오 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

The authors experienced 6 cases of Dimecron intoxication, an organophosphate, that required mechanical ventilator treatment. Among 6 cases, 4 cases were intoxication due to suicidal attempt and 2 cases were due to accidental exposure. Among 4 cases of intoxication due to suicidal attempt, only one patient recovered even after aggressive treatments using gastric lavage, mechanical ventilation, atropine and PAM(pralidoxime). Two cases of intoxications due to accidental exposure, 1 case needed mechanical ventilation. Both cases were recovered without any sequele, however. Organophosphate, especially Dimecron, showed high rates of resfiratory muscle paralysis and mechanical ventilator support. The mortality rate of organophosphate agents can be decreased by education, wearing protectors, and aggressive mechanical ventilator treatment when respiratory failure develops.

석면관련 폐질환의 진단에 있어서 흉부고해상도전산화단층촬영검사(HRCT)의 유용성

이현재,손지언,,홍영습,,이영일,예병진,유창훈,정갑열,김상훈,임형준,장은철,김정만,김준연 大韓産業醫學會 2006 대한직업환경의학회지 Vol.18 No.2

목적: 석면에 노출된 근로자에서 석면관련 폐질환의 양상을 분석하고 진단에 있어 HRCT의 유용성을 연구하여 석면에 대한 의학적 감시프로그램의 개발에 기여하고자 하였다. 방법: 석면에 직접 노출되는 작업자 68명과 간접 노출되는 작업자 94명 등 총 162명에 대해 OSHA 석면 표준, 의학적 감시 프로그램에 따라 단순 흉부방사선검사, 폐활량검사 및 우리나라 실정에 맞게 일부 수정한 의학적 설문지를 통해 면접조사의 방식으로 환자에 관한 정보를 수집하였으며, 자료의 신뢰성을 확보하기 위하여 면접조사는 1달 이상의 기간을 두고 2차례에 걸쳐 실시된 후 확인, 수정하였다. 또한, 석면관련 폐질환을 확진하기 위하여 HRCT를 추가적으로 실시하였다. 결과: HRCT결과 석면관련 폐질환의 유병율은 162명의 근로자중 17명으로 10.5%였는데, 직접 노출군에서 10명 (14.7%), 간접 노출군에서 7명 (7.4%)이었다. HRCT와 비교할 때 단순 흉부방사선검사의 민감도와 특이도는 각각 70.6%와 98.6%이었고, 양성 예측도와 음성 예측도는 각각 85.7%와 96.6%으로, HRCT는 단순흉부방사선검사에 비해 민감도가 높아 초기 석면관련 폐질환을 진단하는데 효과적이었다. 석면관련 폐질환의 진단에 있어 HRCT와 폐활량검사 사이에 유의한 관련성이 관찰되었다. HRCT 결과 석면관련 폐질환의 유무와 의학적 설문조사 결과의 빈도분석을 실시한 결과, 유의한 변수는 작업기간, 흡연량, 호흡기질환의 과거력, 기침, 호흡곤란이었다. 결론: HRCT는 석면관련 폐질환의 진단에 있어 단순 흉부방사선검사와 비교하여 민감도가 높아 초기 진단에 유용하므로 단순 흉부방사선선검사 결과 석면관련 폐질환소견을 보일 때뿐만 아니라, 정상소견을 보이더라도 폐활량 검사결과와 근무력, 흡연력, 호흡기질환의 과거력, 기침, 호흡곤란 등의 호흡기 증상을 참고하여 HRCT검사를 고려해야 한다. 또한, 본 연구에서 관련성이 없었던 요인들에 대해서도 향후 연관성을 규명하는 광범위한 전향적 연구가 필요하다. Objectives: This study was carried out to improve the medical surveillance program of workers exposed to asbestos by examining the usefulness of High Resolution Computed Tomography (HRCT) in the diagnosis of asbestos-related lung disease. Methods: The study subjects comprised 162 workers in a ship-repairing yard, 68 of whom had been directly exposed to asbestos and 94 indirectly exposed. The 'Occupational Safety & Health Administration (OSHA) asbestos standard, medical surveilance program' and HRCT were conducted to analyze the aspects of the asbestos-related lung disease. The OSHA asbestos standard, medical surveilance program consists of simple chest x-ray, spirometry and medical questionnarie. Results: Seventeen (10.5%) of the 162 subjects, 10 (14.7%) directly exposed and 7 (7.4%) indirectly exposed, revealed asbestos-related lung disease on HRCT. The sensitivity and specificity of simple chest x-ray for asbestos-related lung disease were 70.6% and 98.6%, and the positive and negative predictive values were 85.7% and 96.6% respectively, as compared with HRCT, HRCT was an effective diagnostic tool especially to detect early asbestos-related lung disease. The study results indicated a relative significant association between the results of spirometry and HRCT. The variables significantly associated with asbestos-related lung disease on HRCT were work duration, smoking history (pack-years), past history of respiratory disease, cough and dyspnea. Conclusions: In the diagnosis of asbestos-related lung disease, HRCT should be considered not only for workers with positive findings on simple chest x-ray, but also workers with specific findings on spirometry, occupational history, smoking history, and past history of respiratory disease, or with respiratory symptoms such as cough and dyspnea.

특발성 좌심실빈맥(Idiopathic Left Ventricular Tachycardia)의 성공적인 전극도자절제술을 위해 단극전기도(Unipolar Electrogram)가 유용한가?

최기준,남기병,강덕현,홍명기,송재관,김재중,박성욱,박승정,박종훈,김유호 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.4

Effect of narrow-band ultraviolet B phototherapy on the risk of skin cancer in patients with vitiligo: A nationwide population-based retrospective cohort study

( Jung Min Bae ),( Ro Woo Lee ),( Sang Ho Oh ),( Jeong Hyun Shin ),( Hee Young Kang ),( Ji Hun Park ),( Hee Jung Kim ),( Ki-heon Jeong ),( Hee Jung Lee ),( Sang Hoon Lee ),( Dong Hyun Kim ),( Dong-you 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2

Background: There have been concerns for photocarcinogenesis following long-term UV exposure. Evidence about association between the risk of skin cancer and long-term narrow-band ultraviolet B (NBUVB) phototherapy in patients with vitiligo is limited. Objectives: To investigate the risks of skin cancer and premalignant skin lesions, based on the sessions of NBUVB phototherapy in patients with vitiligo and to assess the risks in patients undergone extremely long-term phototherapeutic care (over 500 NBUVB sessions). Methods: This is a retrospective cohort study based on the Korean National Health Insurance Claims database. A total of 60,321 patients with vitiligo aged over 20 were enrolled between 2007 to 2017. Primary outcomes were the development of actinic keratosis, Bowen’s disease, nonmelanoma skin cancer, and melanoma occurred after enrollment. Results: Among the 60,321 patients with vitiligo, the risks of Bowen’s disease, nonmelanoma skin cancer, and melanoma did not increase after phototherapy; the risk of actinic keratosis increased significantly in those who had undergone ≥200 NBUVB sessions (hazard ratio, 2.280; 95% confidence interval 1.537 - 3.383). We then identified 717 patients with vitiligo who had undergone at least 500 sessions; their risks of nonmelanoma skin cancer and melanoma were no greater than those of the controls. Conclusion: Our results imply that long-term NBUVB phototherapy does not increase the risk of skin cancer in patients with vitiligo.

자외선 조사에 의한 고춧가루 중 잔류농약 제거효과 연구

정유정(You-Jung Jung),엄미나(Mi-Na Eom),정일형(Il-Hyung Jeong),손종성(Jong-Sung Son),김경아(Kyung-A Kim),신상운(Sang-Woon Shin),오상헌(Sang-Hun Oh),김봉렬(Bong-Real Kim),채경석(Kyeng-Suk Chae),윤미혜(Mi-Hye Yoon) 한국농약과학회 2012 농약과학회지 Vol.16 No.2

A survey on disease awareness, treatment behavior, and treatment satisfaction in patients with atopic dermatitis: a multicenter study

( Hye Jung Jung ),( Joo Youn Bae ),( Jung Eun Kim ),( Chan Ho Na ),( Gyeong Hun Park ),( You In Bae ),( Min Kyung Shin ),( Young Bok Lee ),( Un Ha Lee ),( Yong Hyun Jang ),( Tae Young Han ),( Ji Young 대한피부과학회 2018 대한피부과학회 학술발표대회집 Vol.70 No.2

Background: In Korea, there is a high dependency on oriental medicine and folk remedies1. And inaccurate information available through the internet is increasing2. So, there is always a possibility that patients may have difficulty obtaining accurate information about atopic dermatitis(AD). Objectives: To determine the awareness, treatment behavior, and treatment satisfaction of patients with AD and their caregivers. Methods: In October 2017, Patients diagnosed with AD at nine hospitals were enrolled in this study. A questionnaire was completed by each patient. Results: A total of 371 subjects were surveyed. In response to the question asking knowledge about AD, the correct answer rate was 55.4%. Bath, use of soap, use of exfoliant, and use of moisturizer showed favorable outcomes. A total of 54.9% patients responded that they were reluctant to steroid ointment usage. When asked about their previous treatment, 39.6% reported using oriental medicine and 26.5% had tried folk remedies. Hospital treatment satisfaction score was 6.6. Conclusion: Patients usually applied their knowledge in their daily lives. However, there is a lot of inaccurate knowledge. Therefore, it is important for patients to understand the characteristics of this disease and obtain correct information.

Case Report : Fatal Neutropenic Enterocolitis during Pegylated Interferon and Ribavirin Combination Therapy for Chronic Hepatitis C Virus Infection

( Ji Hun Kim ),( Jeong Won Jang ),( Chan Ran You ),( Si Young You ),( Mun Kyung Jung ),( Jin Hwan Jung ) The Editorial Office of Gut and Liver 2009 Gut and Liver Vol.3 No.3

It is known that neutropenia caused by combination pegylated interferon plus ribavirin therapy for hepatitis C virus (HCV) infection is well tolerated and carries a negligible risk of infection. Neutropenic enterocolitis is encountered most frequently in patients with hemato- oncologic diseases who are undergoing intensive chemotherapy. However, little information exists regarding this life-threatening event in the setting of HCV therapy. We present here an unusual case of fatal neutropenic enterocolitis in a cirrhotic patient receiving combination therapy for HCV infection. This is the first report of a death from neutropenic enterocolitis associated with treatment for chronic HCV infection. The present case suggests that caution should be exercised when continuing HCV therapy in neutropenic patients with advanced fibrosis, and the decision to maintain such therapy should be balanced against the potential for serious adverse events. (Gut and Liver 2009;3:218-221)