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A Study on Electrical Characteristics of Outdoor Termination with Viscosity of Insulating Oil
Jin‑Wook Choe,Seok‑Hyun Nam,Jin‑Gyu Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3
Outdoor terminations connecting overhead transmission lines and power cables comprise a stress relief cone, which is made of silicone rubber, and insulating oil in a composite or porcelain insulator. The lower the insulating oil viscosity, the greater is its ease of injection. However, the swelling and the degree of change in the electrical properties of the silicone rubber increase with a decrease in the insulating oil viscosity. Therefore, the efect of the expected change in the electrical proper‑ ties of the silicone rubber on the outdoor termination quality should be examined before choosing the insulating oil. In this study, specimens made of insulating and semiconducting silicone rubber were made to swell by impregnating them with three types of insulating oils with diferent viscosities. The AC breakdown strength of the swollen insulating specimens and the volume resistivity and relative permittivity of the semiconducting specimens were measured. The Weibull statistical analysis showed that the lower the insulating oil viscosity, the lower was the AC breakdown strength in overlapping con‑ fdence intervals. The volume resistivity and relative permittivity of the semiconducting specimens changed considerably with a change in the viscosity of the insulating oil. In particular, the volume resistivity of the specimen impregnated with the lowest viscosity insulating oil was 1.57×106 Ω m, indicating loss of semiconducting properties. Furthermore, the efect of changes in the electrical characteristics of the specimens on the outdoor termination quality was examined by performing an electric feld analysis. Compared with the other oils, impregnation with the lowest viscosity insulating oil resulted in the electric feld strength at the edge of the outer semiconducting layer increasing by 15.7%.
남범우,서정석,정헌종,최진영 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.13 No.-
Bipolar disorder, like epilepsy and migraine, is episodic in nature and psychiatric illness requiring lifelong treatment. So, it should not be surprising that anticonvulsants such as carbamazepine and valproate have proven efficacy as mood stabilizers. The newer anticonvulsants such as lamotrigine, gabapentin, topiramate, oxcarbazepine, tiagabine, and zonisamide may also be effective treatments for bipolar disorder. Identifying an anticonvulsant for use in bipolar disorder should take into account not only the pathophysiology of bipolar disorder but also the mechanism of action of the anticonvulsant. Evidence for effectiveness of these novel antiepileptic drugs in treating acute mania and depression as well as in preventing the recurrence of mania and depression is reviewed. In conclusion, although the novel anticonvulsants appear to be clinically useful, more controlled trials are needed to assess the effectiveness in bipolar disorder.
문석우,서정석,남범우,최진영 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-
In recent years, depression is most commonly reported psychiatric condition after stroke, poststroke depression(PSD) has attracted world-wide interest. This review focuses on the major research themes that have emerged. Pooled data from studies, have wide variation in results is due to different criteria for patient selection, different evaluation methods, diagnostic criteria and poststroke intervals, conducted throughout the world have found prevalence rates for from 18% to 65%. The diagnosis of PSD is most appropriately based on a structured mental state exam and DSM-N criteria for depression due to stroke with major depressive-like episode or depressive features. Rarely, poststroke patients may also develop bipolar mood disorder. The treatment of PSD, single antidepressant showing efficacy and electroconvulsive theraphy(ECT) and behavioral therapies have also effective. The progression of recovery following stroke can be altered by treating depression, which has been shown to improve recovery in activities of daily living(ADL) and cognitive impairment and to decreased mortality. The mechanisms underlying the association of stroke and mood disorder are important areas for future investigation.
위에 발생한 유암종 (Carcinoid Tumor) : 1예 보고
김남재,김진희,이경태,서광식,정현용,이승민,김석현,이병석,이헌영 대한소화기내시경학회 1999 Clinical Endoscopy Vol.19 No.3
A carcinoid tumor of the stomach is uncommon, has no clinical symptoms, and is regarded as a benign. It is also incidentally found in most cases. 48-year-old woman with gastric carcinoid tumor was admitted. She had suffered from a anorexia and a dry mouth for 4-months. A gastroscopy revealed a polypoid mass on the greater curvature of the mid-body of the stomach which was subsequently thought to be an adenocarcinoma. An endoscopic mucosectomy revealed however, that it was a carcinoid tumor. A case of carcinoid tumor of the stomach is here by presented with a brief literature review.
김석필,황인남,조진형,황현식 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.2
본 연구는 교정용 브라켓 부착을 위한 레진 접착부위 및 그 인접부위 즉, primer만 도포된 부위의 색변화를 알아보기 위하여 시행되었다. 교정치료를 위해 발치된 60개의 건전한 소구치를 재료로 사용하여 분광측정기로 색을 측정한 후 CIE L*a*b* 색표계로 기록하였다. 20개의 소구치에 광중합형 접착레진으로 브라켓을 부착한 후 부착 전과 제거 후의 색을 측정하였으며 다른 20개의 소구치에는 primer만 도포하고 도포 전과 도포 후의 색을 측정한 후, L* 값을 이용하여 명암 변화를 살펴본 결과 브라켓 부착 및 primer 도포 모두의 경우 명도가 감소하는 경향을 보였으며, a* 값과 b* 값을 이용하여 색상 변화를 살펴본 결과 황색이 증가하는 양상을 나타내었다. 또한 측정된 L*a*b* 값을 이용하여 색변화를 산출하고 임상적으로 인지할 수 있는 색변화 값 3.7을 기준치로 하여 비교 및 분석을 시행한 결과 브라켓 부착 전과 제거 후의 색변화는 기준치보다 큰 것으로 나타났으며 primer 도포에 따른 색변화는 기준치보다 크지 않은 것으로 나타났다. 한편 primer만 도포한 경우 칫솔질에 따른 색변화를 알아보고자 나머지 20개의 소구치를 대조로 하여 칫솔질을 시행한 결과 칫솔질 시행 후 색변화는 기준치보다 큰 것으로 나타났다. 브라켓 제거 후 자연광 노출의 영향을 알아보기 위하여 모든 경우에 추가적으로 photoaging을 시행한 결과 부기적인 색변화는 기준치보다 작은 것으로 나타났다. 이상의 결과는 교정치료를 위한 브라켓 부착으로 인해 브라켓 부착 및 인접부위의 치아색 변화가 있음을 의미하며 임상과정에서 이에 대한 고려가 필요함을 시사하였다. The purpose of this study was to evaluate the tooth color changes of resin bonding sites and their adjacent sites on orthodontic bracket bonding. Sixty extracted sound premolars were used and the tooth color was recorded according to the CIE L*a*b* color system using a spectrophotometer. The tooth colors of the twenty premolars were measured and compared before bracket bonding and after removal. On a further twenty premolars, the tooth color was measured before and after only primer application. In the change of L* values, according to the bracket bonding and primer application, the lightness was decreased, and in the change of a* and b* values, the color was changed into a more yellowish color. The color differences (ΔE*) were calculated from the L*a*b* values and compared with the standard value of clinical detection (ΔE*=3.7). The color differences between before the bracket bonding and after removal noted exceeded the standard value and those of between before and after the primer application were not larger than the standard value. Tooth brushing was performed after application of the primer to evaluate the color changes according to the primer abrasion. As a control, toothbrushing was performed on the last twenty premolars. The color differences noted were larger than the standard value after toothbrushing. Also, to evaluate the color changes of the tooth which is exposed to sun irradiation after bracket removal, additional photoaging was performed and the color was measured for all teeth. The additional color differences after photoaging were smaller than the standard value. The above results suggest that the tooth color changes after fixed orthodontic treatment.