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Sang‑Wook Kim,Hyeon‑Woo Son,Taek‑Kyun Jung,Young‑Bum Chun,Yi‑Hyun Park,Ji‑Woon Lee,Soong‑Keun Hyun 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
The hot deformation behavior of advanced reduced-activation alloy (ARAA) was investigated using hot torsion tests. Thefl ow stress decreased as deformation temperature increased and as strain rate decreased. The fl ow behavior demonstratedthe typical dynamic recrystallization (DRX). Based on the constitutive analysis of peak stress, the activation energy for hotdeformation was found to be 330.3 kJ mol −1 . Peak stress was analyzed as a function of the Zener–Hollomon parameter, andcalculated and experimental values were in good agreement. A DRX kinetic model for ARAA was derived with deformationconditions based on the Avrami-type model. It was confi rmed that the volume fraction of dynamically recrystallized grainsincreased as deformation temperature increased and as strain rate decreased. The necklace structure and grain boundarybulging were observed in the deformed microstructure of ARAA. The suggested DRX mechanism for ARAA during hotworking is discontinuous DRX.
이지전 ( Jee Jeon Yi ),김석일 ( Suck Il Kim ),유승흠 ( Seung Hum Yu ),이상옥 ( Sang Wook Yi ) 한국병원경영학회 2001 병원경영학회지 Vol.6 No.3
This study is about major symptoms of elderly and medical services for elderly in long-term care facilities. The subject of this study was 298 patients over 60 years old staying two geriatric hospitals and two nursing homes. The symptoms and medical services were level of patient classification from RUG(Resouce Utilization Group)-Ⅲ which is applied for both Medicare and Medicaid for skilled nursing facilities reimbursement system in US and designed for measuring patient characteristics and medical staff time. This classification is explained by each patient resource(staff time) utilization level which is called CMI(Case-Mix Index). In this study, the symptoms and services were compared by facility type and they were categorized by level and compared by CMI. Major findings are as follows; 1. There were more elderly who have cognitive function problems in nursing homes than patients in geriatric hospitals. There were more patients with behavioral problems in geriatric hospitals than residents in nursing homes. These results were both statistically significant. 2. The patients in geriatric hospitals received significantly more nursing rehabilitation services, rehabilitation services and extensive services than residents in nursing homes. Other hands, special care services were provided significantly more to residents in nursing homes than elderly in geriatric hospitals. 3. ADL and depression variables had higher CMI when the syptoms were heavier condition. The CMI were not matched with levels of cognitive function problems and behavioral problems. 4. The CMI matched well significantly with levels of nursing rehabilitation services, special care services, and clinically complex services provided for the patient in geriatric hospitals and only nursing rehabilitation services in nursing homes. The CMI for rehabilitation services level and extensive services had regular trends. From the result of this study, the resource utilization level and services provided for elderly in each long-term care facilities were figured out. For the further study, it needs to have more concern about RUG-Ⅲ which classification variables were just analyzed.
Value of Early Referral for Sperm Cryopreservation in Young Men with Cancer
( Sang Hoon Lee ),( Yong Jin Kim ),( Kyong Wook Yi ),( Hyun Tae Park ),( Jae Yun Song ),( Sun Haeng Kim ),( Tak Kim ) 대한산부인과학회 2012 대한산부인과학회 학술대회 Vol.98 No.-
The purpose of this study was to determine the quality of sperm and to evaluate the value of early referral to reproductive specialists for sperm banking in young men with cancer. Data was included in cancer patients who underwent sperm cryopreservation for fertility preservation at the university hospital from April 1998 to October 2011. Secondary analysis of prospective database was performed to evaluate the sperm quality in cancer patients. Of the 51 patients with 92 freezing cycles, data was available in 45 patients with 85 cycles (mean age 27.1±7.3). Thirty three patients were referred before chemotherapy (PreCTX) and 12 were after chemotherapy (PostCTX). Of the 85 cycles, 95.3% (volume), 77.6% (motility), and 44.7% (count) were lower than the normal values for semen analysis. In the PreCTX, 14 had single sperm collection (SSC) and 14 had multiple collections (MSC). There was significant difference in the mean-time of referral in the SSC vs MSC (3.2±3.6 vs 21.2±26.0, p=0.02), Five out of 33 in the PreCTX had additional sperm collection after chemotherapy due to the lack of sperm quality and quantity. Three out of those were referred on the first day of chemotherapy. Patients who were referred 5 days before chemotherapy enable multiple collections. Early referral for sperm banking before chemotherapy should be considered as an essential factor for fertility preservation since the quality of sperm in cancer patients tends to be lower than normal patients, when appropriate, enables multiple fertility preservation cycles. This is the first study demonstrating the benefit of early referral for sperm banking in cancer patients.
Clinical characteristics of papillary thyroid carcinoma arising from the pyramidal lobe
Sang Gab Yoon,Jin Wook Yi,Chan-Yong Seong,Jong-Kyu Kim,Su-Jin Kim,Young Jun Chai,June Young Choi,Kyu Eun Lee 대한외과학회 2017 Annals of Surgical Treatment and Research(ASRT) Vol.92 No.3
Purpose: Papillary thyroid carcinoma (PTC) arising from the pyramidal lobe is rare; therefore, clinicopathologic evaluation is lacking. In addition, the rate of occult malignancy in the pyramidal lobe after thyroid surgery is unclear. This study is to evaluate the clinical characteristics of PTCs that involve the pyramidal lobe. Methods: The study enrolled 1,107 patients who underwent thyroid surgery for PTC at Seoul National University Hospital from 2006 to 2015. Pyramidal lobe status in pathologic reports was clear in all cases. “Pyramidal lobe-dominant PTC” was defined as single pyramidal lobe cancer or multifocal cancer with larger pyramidal lobe tumor. “Incidental pyramidal lobe PTC” was defined as occult cancer identified after thyroidectomy or as multifocal cancer with smaller pyramidal lobe tumor. Results: Ten patients were included in the pyramidal lobe-dominant PTC group. The mean age was 58 ± 12.5 years, and the mean tumor size was 0.7 ± 0.7 cm. Cervical lymph node metastasis was found in 5 patients (50%). Three patients had microscopic lymphatic invasion, and 7 had advanced American Joint Comitee on Cancer (AJCC) stage disease (5 with stage III and 2 with stage IV). Compared with conventional PTC (n = 1,058), pyramidal lobe-dominant PTC was significantly associated with lymphatic invasion (P = 0.031) and advanced AJCC stage (P = 0.022). The prevalence of incidental pyramidal lobe PTC was 3.56%. Conclusion: Pyramidal lobe PTC is relatively small in size; however, the rate of extrathyroidal extension and lymph node metastasis is high. Preoperative evaluation of nodal status is important, and the extent of surgery should be determined in accordance with the preoperative diagnosis.
The <i>Y</i><sup>2</sup> Isochrones Getting an Extra Dimension
Yi, Sukyoung K.,Kim, Yong-Cheol,Demarque, Pierre,Lee, Young-Wook,Han, Sang-Il,Kim, Do Gyun Cambridge University Press 2008 Proceedings of the International Astronomical Unio Vol.4 No.suppl252
<B>Abstract</B><P>The Yonsei-Yale Isochrones have been widely used since its birth in 2001. We announce a major upgrade mainly making varieties of helium values available. The recent works on the globular clusters with extreme helium abundances have called for such a need. The new version of the <I>Y</I><SUP>2</SUP> Isochrones are available for [α/<I>Fe</I>] = 0 through 0.6, Δ<I>Y</I>/Δ<I>Z</I> = 1.5 through 3.0, and extreme helium abundances (<I>Y</I> = normal 0.05, 0.1, 0.15, 0.2), and for 11 metallicity grids, with full capability of interpolation. The database will be powerful for making population models. Besides, the accuracy of the models on the lower main sequence has been substantially improved. We illustrate the major upgrades and demonstrate the power of the new grids.</P>
Yi, Sang-Wook,Odongua, Nemekhee,Nam, Chung Mo,Sull, Jae Woong,Ohrr, Heechoul Ovid Technologies Wolters Kluwer -American Heart A 2009 Stroke Vol.40 No.11
<P>BACKGROUND AND PURPOSE: The association between body mass index and mortality caused by subtypes of stroke among postmenopausal women in terms of smoking status and age at menopause remains controversial. METHODS: The data were derived from a cohort study of 3321 with 17.8 years of follow-up (1985 to 2002). Hazard ratios (HRs) and 95% CIs for strokes as related to body mass index were estimated by Cox proportional hazard models adjusted for age, hypertension, smoking, drinking, occupation, education, self-reported health, and age at menopause. A stratified analysis was conducted by age at menopause and smoking status. RESULTS: The obese group (body mass index >or=27.5 kg/m(2)) had higher risks of total stroke mortality (HR, 1.59; 95% CI, 1.05 to 2.42) and hemorrhagic stroke mortality (HR, 2.91; 95% CI, 1.37 to 6.19) than the normal weight group (18.5<or= body mass index <23.0). Among ever smokers, the obese group showed significantly increased risks of total stroke mortality (HR, 2.33; 95% CI, 1.00 to 5.43) and ischemic stroke mortality (HR, 7.21; 95% CI, 1.18 to 44.3). Obesity had more effect on stroke mortality among women who experienced menopause at age <50 than women with age >or=50. For the obese group of the former, the HR of total stroke was 2.04 (95% CI, 1.25 to 3.34) and that of hemorrhagic stroke 6.46 (95% CI, 2.42 to 17.25). CONCLUSIONS: In this prospective study, obesity raised the risks of total stroke mortality and hemorrhagic stroke mortality among Korean menopausal women. It was more evident with women who experienced menopause at age <50. The obese group of ever smokers was at an increased risk of ischemic stroke mortality.</P>
Agent Orange Exposure and Prevalence of Self-reported Diseases in Korean Vietnam Veterans
Yi, Sang-Wook,Ohrr, Heechoul,Hong, Jae-Seok,Yi, Jee-Jeon The Korean Society for Preventive Medicine 2013 Journal of Preventive Medicine and Public Health Vol.46 No.5
Objectives: The aim of this study was to evaluate the association between Agent Orange exposure and self-reported diseases in Korean Vietnam veterans. Methods: A postal survey of 114 562 Vietnam veterans was conducted. The perceived exposure to Agent Orange was assessed by a 6-item questionnaire. Two proximity-based Agent Orange exposure indices were constructed using division/brigade-level and battalion/ company-level unit information. Adjusted odds ratios (ORs) for age and other confounders were calculated using a logistic regression model. Results: The prevalence of all self-reported diseases showed monotonically increasing trends as the levels of perceived self-reported exposure increased. The ORs for colon cancer (OR, 1.13), leukemia (OR, 1.56), hypertension (OR, 1.03), peripheral vasculopathy (OR, 1.07), enterocolitis (OR, 1.07), peripheral neuropathy (OR, 1.07), multiple nerve palsy (OR, 1.14), multiple sclerosis (OR, 1.24), skin diseases (OR, 1.05), psychotic diseases (OR, 1.07) and lipidemia (OR, 1.05) were significantly elevated for the high exposure group in the division/brigade-level proximity-based exposure analysis, compared to the low exposure group. The ORs for cerebral infarction (OR, 1.08), chronic bronchitis (OR, 1.05), multiple nerve palsy (OR, 1.07), multiple sclerosis (OR, 1.16), skin diseases (OR, 1.05), and lipidemia (OR, 1.05) were significantly elevated for the high exposure group in the battalion/company-level analysis. Conclusions: Korean Vietnam veterans with high exposure to Agent Orange experienced a higher prevalence of several self-reported chronic diseases compared to those with low exposure by proximity-based exposure assessment. The strong positive associations between perceived self-reported exposure and all self-reported diseases should be evaluated with discretion because the likelihood of reporting diseases was directly related to the perceived intensity of Agent Orange exposure.