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김한준,황갑주 울산대학교 2002 공학연구논문집 Vol.33 No.1
전력계통의 조류계산과 고장계산은 전력계통의 운용과 해석 및 계획의 기반이 되는 산법으로 계속 연구 개선되어 오고 있으며, 최근에는 컴퓨터 분야의 발달에 따라 소형 컴퓨터 레벨에서도 대규모 계통을 해석할 수 있는 소프트웨어들이 개발되고 있다. 본 연구를 통하여 퍼스널 컴퓨터 레벨에서 대규모의 실계통을 해석할 수 있는 소프트웨어를 개발하였으며, 산법은 어드미턴스 행렬을 기반으로 하였고 스퍼스 프로그래밍 기법을 도입함으로서 대규모 실계통의 해석을 가능하게 하였다 개발된 소프트웨어는 이미 전력회사에서 성능을 검증받은 PTI사의 소프트웨어인 PSS/E와의 입력자료 호환성을 갖도록 하였고, 사용자의 접근을 쉽게 할 수 있는 그래픽사용자 인터페이스 환경을 구현하였다. 개발된 산법의 성능을 검증하기 위하여 PSS/E 20 모선 샘플계통, IEEE 샘플계통 및 한국전력 실계통에 적용하였다. There have been many studies of load flow calculations and fault calculations of power system in the area of software applications. These studies provide a basis for planning and operation for power systems. This paper describes the fault calculation software which was developed and implemented for large scaled power system. Proposed software also benefits small system-level computers and are based on the sparse admittance matrix. This software can exchange input data of PSS/E which is well known in the field of practical utility. A comparison of proposed method with PSS/E method is also presented for sample systems and KEPCO system.
이준희,이용주,한승태 大韓應急醫學會 1998 대한응급의학회지 Vol.9 No.3
Background. Dizziness is a common complaint in patients presenting to the emergency room and that has various pathologic causes. This study investigate the clinical differences in dizziness between the central origin and the peripheral origin and to provides the clues for diagnosis and proper treatment. Methods. We analyzed 290 patients with dizziness during 12months period prospectively, who visited in ED, Inha University Hospital from Jan. 1997 to Dec 1997. We analysized sec ratio, characteristics of the dizziness, associated past illness associated symptoms, severity, results of the special radiologic study, nystagmus type, and causes of central origin and peripheral origin dizziness. Results. Male to female ratio was 1:1.4 in central origin(n=165) and 1:20 in peripheral origin(n=125). Most common age group was fifth decade in both groups. According to the characteristics of the dizziness, rotation sense was the main complaint of the peripheral origin dizziness. Most common past illness was hypertension in both groups. MRI has diagnostic priority than CT scan in central origin dizziness. Types of nystagmus has some significant differences between two groups. Conclusion. Dizziness may represented as a sign of significant pathological neurologic status especially in central origin. So we must precisely evaluate the patient history, neurologic examination of the inner ear and CNS, and special radiologic study incliding MRI.
노인 인구에서 신경인지기능저하와 혈청 지질농도와의 상관성
유영선,최석주,정성수,김지은,윤성욱,전동욱,백준형,박성우,이정구,추일한,김영훈 大韓神經精神醫學會 2008 신경정신의학 Vol.47 No.6
Objectives : In this study, the authors evaluated the correlation between eurocognitive impairments and serum lipids levels among Korean elderly over the age of 65. Methods : A total of 609 elderly individuals participated in this study. Screening for cognitive impairments were carried out using the Mini-Mental Status Examination-Korean version (MMSE-KC). There were 197 subjects above 1.5SD Of MMSE- KC and they were evaluated using the Korean versions of the Consortium to Establish a Registry for Alzheimer's Disease (AD) (CERAD-KC) and Geriatric Depression Scale (GDS-K). Results : There was a correlation between old age/low levels of education and AD (p<0.05, P<0.01). There was an inverse correlation between the serum level of total cholesterol and the word list recognition test scores. The serum levels of LDL cholesterol were inversely correlated with the scores on the constructional praxis test, word list recall test and word list recognition test. Inverse correlations between the serum level of triglyceride and scores on the word list recall test and word list recognition test were also observed. Conclusion : There were inverse correlations between the serum levels of lipids and language/memory function in subjects with AD.
장기간 댄스스포츠가 호흡순환 기능 및 심폐지구력에 미치는 효과
조현철,김준희,한주희 龍仁大學校 體育科學硏究所 1998 體育科學硏究論叢 Vol.8 No.1
The purpose of this study was to evaluate the effects in respire-circulatory function and cadio-pulmonary endurance capacity. Twelve females(trained 6, untrained 6) participated in dancesport program that is 90min/day, 2day/week for 20weeks. The results were obtained as follow : 1. No significant difference was found in heart rate, ventilation and respiration rate among pretest, after 10 weeks and 20 weeks of dance program and between trained and untrained group. 2. Significant differenced was found in VCO₂between pretest and 20Weeks later in untrained group. 3. There was significantly increased VO₂max in 20 weeks dance program later compared with pretest and significant difference between groups. 4. There was no significant difference in ventilatory threshold and exercise time was not significant difference among trials and between groups. Conclusively, respiro-circulatory function and cardio-pulmonary endurance capacity were not changed at submaximal stage of excise test but those were significantly increased at maximal of exercise test during 20 weeks. Therefore, it is suggested that long term dancesport exercise program is expected more effective on the repiro-circulation function and cardio-pulmonary endurance capacity.
( Jun-ho Lee ),( Soo-bong Choi ),( Dong-jun Sung ),( Mingli Jin ),( Ju-han Lee ),( Ji-young Mun ),( Tae-sook Hwang ),( Sang-don Han ),( Young-tae Ro ),( Sung-young Kim ),( Jueng-soo You ),( Inja Lim ) 생화학분자생물학회(구 한국생화학분자생물학회) 2020 BMB Reports Vol.53 No.2
While liver histopathology is heterogeneous in diabetes, the underlying mechanisms remain unclear. We investigated whether glycemic variation resulting from differential diets can induce heterogeneity in diabetic liver and the underlying molecular mechanisms. We generated end-stage non-obese diabetic model rats by subtotal-pancreatectomy in male Sprague- Dawley rats and ad libitum diet for 7 weeks (n = 33). The rats were then divided into three groups, and fed a standard- or a low-protein diet (18 or 6 kcal%, respectively), for another 7 weeks: to maintain hyperglycemia, 11 rats were fed ad libitum (18AL group); to achieve euglycemia, 11 were calorierestricted (18R group), and 11 were both calorie- and proteinrestricted with the low-protein diet (6R group). Overnightfasted liver samples were collected after the differential diets together with sham-control (18S group), and histology and molecular changes were compared. Hyperglycemic-18AL showed glycogenic hepatopathy (GH) without steatosis, with the highest GSK-3β inactivation because of Akt activation during hyperglycemia; mitochondrial function was not impaired, compared to the 18S group. Euglycemic-18R showed neither GH nor steatosis, with intermediate GSK-3β activation and mitochondrial dysfunction. However, euglycemic-6R showed both GH and steatosis despite the highest GSK-3β activity and no molecular evidence of increased lipogenesis or decreased ApoB expression, where mitochondrial dysfunction was highest among the groups. In conclusion, heterogeneous liver histopathology developed in end-stage non-obese diabetic rats as the glycemic levels varied with differential diets, in which protein content in the diets as well as glycemic levels differentially influenced GSK-3β activity and mitochondrial function in insulin-deficient state. [BMB Reports 2020; 53(2): 100-105]
( Ju Hee Han ),( Jae Woong Yoon ),( Jin Woo Park ),( Jae Yeon Ryu ),( Chul Hwan Bang ),( Jun Young Lee ),( Young Min Park ),( Suk Jun Lee ),( Ji Hyun Lee ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Atopic dermatitis (AD) is a common, chronic inflammatory skin disorder which is known to be related with epidermal barrier function impairment and abnormal skin immune response. According to previous studies, increased risk of infectious disorder in AD is related with impaired epidermal function, abnormal systemic immune function and lower anti-microbial peptides. Objectives: The aim of our study was to identify the relationship between AD and infectious skin disorders in the reality through a population-based study using sequential pattern mining (SPM). Methods: We obtained population-based data recorded from 2011 to 2013 by the Health Insurance Research and Assessment Agency. SPM was used to identify the comorbidities and to measure the time onset of the comorbidities. Results: Patients with AD had a higher comorbidity of dermatophytosis, molluscum contagiosum, impetigo. AD patients were at higher risk for molluscum contagiosum (adjusted odds ratio (aOR) 5.273), impetigo (aOR 2.852), chicken pox (aOR 2.251), otitis media (aOR 1.748), eczema herpeticum (aOR 1.292) and viral wart (aOR 1.105). Conclusion: Our study demonstrates that AD could increase the risk of infectious disorders and that it might be meaningful for early diagnosis and also for management. In particular, care should be taken because of its high relevance with impetigo, molluscum contagiosum and otitis media which may help AD patients from worsening by preventing and managing them appropriately.
The risk of psoriasis in patients with allergic diseases: a nationwide population-based cohort study
( Ju Hee Han ),( Chul Hwan Bang ),( Joon Ho Son ),( Hwa Jung Yook ),( Kyungdo Han ),( Jae Yeon Ryu ),( Jun Young Lee ),( Young Min Park ),( Ji Hyun Lee ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1
Background: The spectrum of allergic diseases includes atopic dermatitis (AD), allergic rhinitis (AR), and asthma. To date, the association between allergic diseases and psoriasis has not been evaluated. Objectives: This study was conducted to determine the risk of psoriasis in patients with allergic diseases. Methods: This was a nationwide population-based cohort study in which data of 9,718,722 subjects ≥20 years of age were analyzed. Results: The incidence of psoriasis per 1,000 person-years was 9.57, 3.78, and 4.28 in the AD, AR, and asthma groups, respectively. The AD group exhibited a significantly increased risk of developing psoriasis (hazard ratio [HR], 3.18; 95% confidence interval [95% CI], 3.05-3.31) (P<0.001) after adjustment for confounding factors. The risk of psoriasis was significantly increased in the AR group (HR, 1.32; 95% CI, 1.31-1.34) (P<0.001) and asthma group (HR, 1.30; 95% CI, 1.27-1.33) (P<0.001). The risk of developing psoriasis tended to increase with the number of accompanying allergic diseases. In the presence of all three allergic diseases, the HR of psoriasis was 3.16 (95% CI, 2.70-3.69) (P<0.001). Conclusion: Allergic diseases, particularly AD, may be a risk factor for psoriasis.