近視性 屈折異常의 疫學的 硏究

劉世煥,廉容泰 고려대학교 의과대학 1984 고려대 의대 잡지 Vol.21 No.1

The distribution of ametropia whether refractive or axial in communities is variable according to factors such as ethnicon, age, living environment, and working begavior among others. Among young adults in Korea whose eves are fully matured most ametropia results form myopic refractive errors. It is well known that the prevalence of myopia among college students in Korea is very high, more than 60%. Nevertheless, community based epidemiological research on the causalities of myopia has: not been adequately performed to provide preventive or control measures for myopia for the young in Korea. In view of this, the author attempted an epidemiological study on myopia using the distribution of personal characteristics, and analyzing these factors on a total of 8,555(4,006 in 1981 and 4,549 in 1982) newly enrolled college students of Korea University The summarized results were as follows: 1. A total sample of 115 among 3,337 ametropic cases discovered during screening by visual acuity examination were selected for confirmation by objective refraction tests. One hundred percent of these were discovered to be of the myopic type. Statistical analysis of visual acuity and refraction revealed: R=-3.172+3.407V, r=-0.781, p<0.001 V=0.748+0.179R, r=-0.781, p<0.001 Using simple linear regression; and log(-R)=0.543-1.050V, R^(2)=0.673, F=419.478, p<0.001 logV=-0.042+0.629R, R^(2)=0.760, f=588.559, P<0.001 using logarithmic transformation of exponential curve linear regression, where V= visual acuity, and R=refraction in diopter. 2. The prevalence of ametropia was 65% in 1981 and 73% in 1982. Most of the ametropic cases were predicted to be the myopic type of refractive errors. No significant difference in prevalence by sex was found. However, the rates among males raised in urban areas, and among high economic females found to be significantly higher than other groups. 3. Factors related to causalities of myopia were analysed in terms of work credit, reading behavior, heredity, and food habits as shown in the followings; (1) The correlation between the variables of visual acuity and score on college entrance examinations was V=-0.01S+1.52, r=-0.14, p<0.001(where S=score) Showing a low interpretation capacity but very high reliability. (2) Average distance between the eyes and a book while reading was significantly shorter in myopia than the emetropia group. Distance in the majority of myopia cases were less than 25cm. (3) Attack rate of myopia of siblings born from myopic parents(one or both eyes) was found to be significantly higher(doubled) than that from emetropic parents. This provides substantial evidence that heredity plays an important role in revealing myopia. (4) There were more vegetarians and persons with seriously unbalanced diets in the myopia group. However, rates by visual acuity were too low to be tested for significance. 4. Clinical findings included the relationship between the site of major eye and myopic eye, data on the correction of visual acuity, and onset on visual disturbances. (1) In the majority of the emetropic group the major eye was the right eye, while in persons whose right eyes were myopic the majority had left eyes as the major ones. Similarly, in case where the left eye was myopic the right eye tended to be the major eye. In cases where both eyes were myopic, the pattern followed the emetropic group in that the majority had the right eyes as the major eye. (2) The more severe the myopic status was, the higher the rate of wearing glasses was. About 50% of glasses wearers got their glasses from opticians without an ophthalmologist’s prescription. (3) The onset of visual disturbance in the majority(47%) of myopic cases was during highschool.

管理會計의 未來

曺廷煥,柳世杰 경북대학교 경제경영연구소 1992 經商論集 Vol.20 No.3

선천성 Long QT 증후군 환자의 경흉부 교감신경절제술을 위한 마취관리

김두식,김승수,이석우,김세환,장태호,박세훈,류시정,김경한 대한마취과학회 2000 Korean Journal of Anesthesiology Vol.39 No.3

A 23-year-old female patient was diagnosed with congenital long QT syndrome, discovered when she visited our cardiac department due to chest discomfort, because she had a prolonged QTc interval on ECG, history of syncopal attacks and seizures several times every year, and ingestion of anticonvulsants for several yeam. It is well known that the long QT syndrome is associated with sudden death secondary to ventricular tachyarrhythmia or fibrillation at a young age. Moreover cardiac artests during induction, maintenance, and awakening of anesthesia of these patients have been reported, and may be due to asymmetrical adrenergic stimuli in the heart, especially in the unrecognised case. This case report describes the anesthetic management of a patient with congenital long QT syndrome, who presented for cervicothoracic sympathectomy for a more permanent control of life-threatening ventricular arrhytbmias, and reviews the related literature.

Correlation between content of major components and α-glucosidase inhibitory activity according to the cultivation stage of Hericium erinaceus

Se Hwan Ryu,Ayman Turk,Sang Won Yeon,Solip Lee,Beom Seok Kim,Sung Min Ko,Bang Yeon Hwang,Mi Kyeong Lee 한국버섯학회 2023 버섯 Vol.27 No.1

Hericium erinaceus (lion’s mane mushroom) is an edible and medicinal mushroom that belongs to the family Hericiaceae. It has been traditionally used for the treatment of memory impairment and gastrointestinal diseases. We previously reported hericene A as an anti-diabetic constituent of H. erinaceus and investigated the effect of cultivation substrates on its content. As the continuation, the contents of five major compounds, including hericenes A-D, which exhibit α-glucosidase inhibitory activity together with ergosterol, were investigated according to the cultivation stage. H. erinaceus was cultured for 5 stages to induce fruiting bodies, and the contents of the compounds at each stage were quantified through HPLC analysis. Among the major compounds the content of hericene A was the highest, followed by hericene C and the content of hericenes B and D was relatively low. The contents of four hericene derivatives are the highest at stage 4 whereas the content of ergosterol was highest at stage 5. The highest α-glucosidase inhibitory activity of H. erinaceus was at stage 4, which correlates with the contents of hericene derivatives. Conclusively, H. erinaceus with better efficacy and high content of active constituents can be secured by the optimization of cultivation conditions.

The Optimal Management of Pleural Effusion in Liver Abscess?

( Se Ri Ryu ),( Jae Young Jang ),( Tom Ryu ),( Soung Won Jeong ),( Youngyun Cho ),( Jeeyeon Kim ),( Jeong-ju Yoo ),( Sae Hwan Lee ),( Sang Gyune Kim ),( Sang-woo Cha ),( Young Seok Kim ),( Young Deok 대한간학회 2018 춘·추계 학술대회 (KASL) Vol.2018 No.1

Aims: We investigated the characteristics and clinical features of pleural effusion in patients with liver abscess. Methods: This is a retrospective study conducted in a single center to evaluate the characteristics and management of pleural effusion in patients with liver abscess hospitalized between January 2006 and February 2018 at Soonchunhyang University Seoul Hospital. A total of 526 patients were collected. Of these, 156 patients diagnosed as eosinophilic abscess or later cholangiocarcinoma or liver metastasis were excluded from the analysis. Finally, the clinical, radiological, and laboratory findings were analyzed in total of 370 patients in liver abscess. Results: Of the patients with liver abscess, 110 (29.7%) patients had pleural effusion. Among of these, 56.4% occurred in right, 5.5% in left and 35.5% in both. When pleural effusion was present, age (older age, P=0.046), liver abscess size (43.01 vs. 59.48mm, P=0.000) and location (right superior segment, P=0.000) were significantly different from those without. Most of patients (96 patients) were treated with only antibiotics and 14 patients underwent intervention with antibiotics for pleural effusion. Of the 13 patients who were able to perform fluid analysis, 11 (84.6%) were exudate and 2 (15.4%) were transudate. Duration of pleural effusion showed no significant difference between the groups that performed intervention and those who were treated with antibiotics only (17.79 vs. 12.35 days, P= 0.112). Conclusions: The pleural effusion was more frequent in older patients, larger size and right superior segment. There was no statistically significant difference in duration of pleural effusion between intervention and non-intervention group. Therefore, treatment of pleural effusion is thought to be sufficient for antibiotics without special intervention in patients with liver abscess.

Molecular Analysis of the 3'-Terminal Region of Lily Latent Carlavirus from Lilium lancitoium

Ryu, Ji-Hwan,Park, Hye-Won,Park, Won-Mok,Lee, Se-Yong,Ryu, Ki-Hyun The Korean Society of Plant Pathology 2000 Plant Pathology Journal Vol.16 No.4

The 3,000 nucleotides of 3'-terminal region of the genomic RNA of a new isolate of carlavirus from a Korean native lily (Lilum lancitoium) was cloned and its nucleotide sequences were determined. The coat protein (CP) gene of the virus showed 72.0% to 72.8% nucleotide sequence identities and 86.9% to 88.0% amino acid sequence identities with those of the four strains (two Korean, one Dutch, and one Japanese isolates) of lily symptomless virus (LSV). Interestingly, different amino acid sequences between the new isolate and LSV strains were located at the N-terminal region of the CP. Pairwise amino acid sequence comparison of the CP gene revealed sequence identities of 22.0% to 71.1% between the virus and other 9 carlavirus species. The 25 kDa and 12 kDa proteins genes of the virus share 30.7% to 76.3% and 31.1% to 85.8% amino acid sequence identities, respectively, with those of 8 other carlaviruses. The 16 kDa protein gene of the virus shares 16.7% to 72.9% amino acid sequence identities with that of 9 other carlaviruses. These data indicate that the virus, designated as lily latent virus (LiLV), is a distinct of the Carlavirus genus and distinguished from the known strains of LSV.

A Study on the Characteristics of the Heavy Rainfall Events in Honam District along the Border of mT Airmass

Se-Hwan Yang, Chan-Su Ryu 조선대학교 기초과학연구원 2012 조선자연과학논문집 Vol.5 No.4

District of Korea affected by westerly wind and heavy rainfall is predominantly distributed in the west and south of Honam district. So, this study is becoming a necessity. In this study, it is investigated that the characteristics of heavy rainfall occurred frequently in Honam district along the border of mT airmass after the end of rainy season due to atmospheric instability, lower (850 hPa) convergence and topographic effect. Our results show that heavy rainfall occurred in Honam district along the border of mT airmass results from the appropriate mechanism of the unstable vertical structure and moisture flux in the expansion and contraction of the border of mT airmass. All things considered, the improvement of the predictability of heavy rainfall occurred in Honam district along the border of mT airmass could be possible by the generalization of the results of this study.

댐 안전 모니터링 고도화 기술

류세환(Ryu, Se Hwan),박지민(Park, Ji Min),윤진섭(Yoon, Jin Seob) 대한토목학회 2022 대한토목학회 학술대회 Vol.2022 No.10

EMCAS 모형을 이용한 전력수급분석 사례연구

장세환(Se-Hwan Jang),박종배(Jong-Bae Park),신중린(Joong-Rin Shin),류성호(Sung-Ho Ryu),김은환(Eun-Hwan kim) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7

전력시스템의 운영에 있어, 신뢰성 있는 전력수급계획을 수립하는 것은 매우 중요한 일이다. 본 연구에서는 다양한 전력수급 분석 모형 중 EMCAS 모형을 소개하고, EMCAS 모형에 의해 분석된 단기/장기 시뮬레이션 결과를 나타내고 있다.

Molecular Analysis of the 3`-Terminal Region of Lily Latent Carlavirus from Lilium Lancitoium

Ji Hwan Ryu,Hye Won Park,Won Mok Park,Se Yong Lee,Ki Hyun Ryu 한국식물병리학회 2000 Plant Pathology Journal Vol.16 No.4