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분산 파일 시스템에서의 Sharing Semantics 구현
김경애(Kyungae Kim),윤귀석(Gwisuk Yoon),김성규(Seonggyu Kim) 한국정보과학회 1998 한국정보과학회 학술발표논문집 Vol.25 No.1B
분산 파일 시스템은 다수의 사용자들이 물리적으로 여러 사이트에 산재해 있는 파일의 공유를 지원하는 것을 목적으로 한다. 본 논문에서는 분산 파일 시스템에서의 다수의 사용자들이 파일과 기억 장치 자원들을 공유하도록 허용하는 여러 sharing semantics를 비교 분석하고, 지연이 적게 일어나는 Session semantics를 기반으로 여러 사용자들의 한 파일에 대한 접근에 있어서 가장 최근의 쓰기 연산으로 갱신된 내용과 동일한 내용을 제공하는 일관성(consistency)에 중점을 둔 Sharing Semantics를 제시하고자 한다.
Ahn Tae Ran,Yoon Young Cheol,Kim Hyun Su,Kim Kyunga,Lee Ji Hyun 대한영상의학회 2023 Korean Journal of Radiology Vol.24 No.5
Objective: To investigate the association between pelvic bone computed tomography (CT)-derived body composition and patient outcomes in older adult patients who underwent surgery for proximal femur fractures. Materials and Methods: We retrospectively identified consecutive patients aged ≥ 65 years who underwent pelvic bone CT and subsequent surgery for proximal femur fractures between July 2018 and September 2021. Eight CT metrics were calculated from the cross-sectional area and attenuation of the subcutaneous fat and muscle, including the thigh subcutaneous fat (TSF) index, TSF attenuation, thigh muscle (TM) index, TM attenuation, gluteus maximus (GM) index, GM attenuation, gluteus medius and minimus (Gmm) index, and Gmm attenuation. The patients were dichotomized using the median value of each metric. Multivariable Cox regression and logistic regression models were used to determine the association between CT metrics with overall survival (OS) and postsurgical intensive care unit (ICU) admission, respectively. Results: A total of 372 patients (median age, 80.5 years; interquartile range, 76.0–85.0 years; 285 females) were included. TSF attenuation above the median (adjusted hazard ratio [HR], 2.39; 95% confidence interval [CI], 1.41–4.05), GM index below the median (adjusted HR, 2.63; 95% CI, 1.33–5.26), and Gmm index below the median (adjusted HR, 2.33; 95% CI, 1.12–4.55) were independently associated with shorter OS. TSF index (adjusted odds ratio [OR], 6.67; 95% CI, 3.13–14.29), GM index (adjusted OR, 3.45; 95% CI, 1.49–7.69), GM attenuation (adjusted OR, 2.33; 95% CI, 1.02–5.56), Gmm index (adjusted OR, 2.70; 95% CI, 1.22–5.88), and Gmm attenuation (adjusted OR, 2.22; 95% CI, 1.01–5.00) below the median were independently associated with ICU admission. Conclusion: In older adult patients who underwent surgery for proximal femur fracture, low muscle indices of the GM and gluteus medius/minimus obtained from their cross-sectional areas on preoperative pelvic bone CT were significant prognostic markers for predicting high mortality and postsurgical ICU admission.
최보람,김태림,Sun Young Yoon,유준상,Ho-Jeong Won,Kyunga Kim,강은진,윤희,황승연,신태건,심민섭,차원철 대한의료정보학회 2019 Healthcare Informatics Research Vol.25 No.4
Objectives: The aim of this study was to test the applicability of haptic feedback using a smartwatch to the delivery of cardiac compression (CC) by professional healthcare providers. Methods: A prospective, randomized, controlled, case-crossover, standardized simulation study of 20 medical professionals was conducted. The participants were randomly assigned into haptic-first and non-haptic-first groups. The primary outcome was an adequate rate of 100–120/min of CC. The secondary outcome was a comparison of CC rate and adequate duration between the good and bad performance groups. Results: The mean interval between CCs and the number of haptic and non-haptic feedback-assisted CCs with an adequate duration were insignificant. In the subgroup analysis, both the good and bad performance groups showed a significant difference in the mean CC interval between the haptic and non-haptic feedback-assisted CC groups—good: haptic feedback-assisted (0.57–0.06) vs. non-haptic feedback-assisted (0.54–0.03), p < 0.001; bad: haptic feedback-assisted (0.57–0.07) vs. non-haptic feedback-assisted (0.58–0.18), p = 0.005—and the adequate chest compression number showed significant differences— good: haptic feedback-assisted (1,597/75.1%) vs. non-haptic feedback-assisted (1,951/92.2%), p < 0.001; bad: haptic feedbackassisted (1,341/63.5%) vs. non-haptic feedback-assisted (523/25.4%), p < 0.001. Conclusions: A smartwatch cardiopulmonary resuscitation feedback system could not improve rescuers' CC rate. According to our subgroup analysis, participants might be aided by the device to increase the percentage of adequate compressions after one minute.
( Dong Hyun Sinn ),( Jeong-hoon Lee ),( Kyunga Kim ),( Joong Hyun Ahn ),( Ji Hyeon Lee ),( Jung Hee Kim ),( Dong Hyeon Lee ),( Jung-hwan Yoon ),( Wonseok Kang ),( Geum-youn Gwak ),( Yong-han Paik ),( 대한간학회 2017 Gut and Liver Vol.11 No.4
Background/Aims: Hepatocellular carcinoma (HCC) can develop in chronic hepatitis B (CHB) patients with normal alanine aminotransferase (ALT) levels. Therefore, methods that can stratify an individual`s HCC risk are needed. Methods: A simple HCC risk score was developed from 971 patients with CHB who had elevated hepatitis B virus DNA levels (>2,000 IU/mL) with normal or mildly elevated ALT levels (<80 U/L). The score was validated from an independent cohort of 507 patients. Results: A 4-point risk scale was developed, with HCC risk ranging from 0% to 17.8% at 5 years for the lowest and highest risk scores. The D2AS score had high area under the receiver operating curves (AUROCs) for predicting development of HCC at 3/5 years (0.895/0.884). The calculated AUROCs to predict the development of HCC at 3/5 years were 0.889/0.876 in the validation cohort, with 5-year HCC incidence rates ranging from 0% to 13.8% at 5 years for the lowest and highest risk scores. Conclusions: The D2AS risk score can play a valuable role in risk stratification and may be useful for guiding clinical decisions for enhanced surveillance or treatment to reduce the HCC risk in CHB patients with normal or mildly elevated ALT levels. (Gut Liver 2017;11:528-534)
( Dong Hyun Sinn ),( Jeong-hoon Lee ),( Kyunga Kim ),( Joong Hyun Ahn ),( Ji Hyeon Lee ),( Jung Hee Kim ),( Dong Hyeon Lee ),( Jung-hwan Yoon ),( Wonseok Kang ),( Geum-youn Gwak ),( Yong-han Paik ),( 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: As antiviral therapy for chronic hepatitis B (CHB) reduces therisk of hepatocellular carcinoma (HCC), ideally, no HCC should developin those who are not recommended for therapy. Yet, HCC developmentwho were outside of current treatment recommendation hasbeen reported.Methods: A simple HCC risk score was developed from 971 patientswith CHB with elevated HBV DNA levels who were outside the currenttreatment criteria due to having normal or mildly elevated alanineaminotransferase (ALT) levels (of whom 26 patients developed HCCduring follow-up). Variables included in the risk score were serumHBV DNA level (used twice), age, and sex (D 2AS score). The scorewas validated from an independent cohort of 507 patients (of whom15 patients developed HCC).Results: A 4-point risk scale was developed, with HCC risk rangingfrom 0-29.1% at 5 years for the lowest and highest D 2AS score.The D 2AS score had the highest area under receiver operating curves(AUROCs) for predicting development of HCC at 3/5 years(0.895/0.884), compared with that of risk estimation for hepatocellularcarcinoma in chronic hepatitis B (REACH-B) (0.814/0.812)and Fibrosis-4 (FIB-4) (0.759/0.702) scores, age (0.739/0.718), andALT (0.666/0.766) and HBV DNA (0.559/0.556) levels. The calculatedAUROCs to predict development of HCC at 3/5 years were 0.889(95% confidence interval [CI〕 0.796-0.983)/0.876 (95% CI,0.789-0.963) in the validation cohort, with 5-year HCC incidencerates of 0%, 0.6%, 6.3%, and 19.2% for very low, low, high, andvery high D 2AS scores, respectively.Conclusions: HCC developed in patients with elevated HBV DNAlevels and normal or mildly increased ALT levels. The D2AS riskscore can play a valuable role in risk stratification, and may beuseful to guide clinical decisions for enhanced surveillance or treatmentto reduce HCC risk in this population.