Organic Solar Cells: Solution‐Processable Reduced Graphene Oxide as a Novel Alternative to PEDOT:PSS Hole Transport Layers for Highly Efficient and Stable Polymer Solar Cells (Adv. Mater. 42/2011)

Yun, Jin‐,Mun,Yeo, Jun‐,Seok,Kim, Juhwan,Jeong, Hyung‐,Gu,Kim, Dong‐,Yu,Noh, Yong‐,Jin,Kim, Seok‐,Soon,Ku, Bon‐,Cheol,Na, Seok‐,In WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.42

<P>Solution‐processable reduced graphene oxide as a hole‐transporting layer for highly efficient and stable organic solar cells is reported on page 4923 by Dong‐Yu Kim, Seok‐In Na, and co‐workers. Introduction of a newly reduced graphene oxide by simple solution processing into solar cells dramatically raises the cell efficiency and cell life‐time. The results will allow full use of chemically reduced graphene and will advance the realization of carbon‐based printable optoelectronic devices. </P>

공 컨테이너를 고려한 컨테이너 내륙수송에서의 차량배치문제

윤원영,안창근,최용석 한국경영과학회 1999 한국경영과학회지 Vol.24 No.4

In the container transportation of inland depots the empty container is an important issue. The truck dispatching problem in this paper is considered under restriction about empty containers. When a full container arrives in a depot by truck, after unloading operation the full container is changed to an empty container. After loading operation an empty container is changed to a full container. We suggest an integrated approach to the problem of simultaneously managing empty truck and container movements. We would like to find the truck dispatching method minimizing empty truck movements and empty container movements. In this paper, a mixed integer programming model is developed to obtain the optimal truck dispatching in container transportation and heuristic is developed to give a good solution in much shorter time. The numerical examples are studied and the proposed heuristic is also compared with the result of numerical examples.

고려대장경 인터넷 검색 및 열람

윤용석 동국대학교 전자불전연구소 1999 전자불전 Vol.1 No.-

순천향대학교 천안병원에 입원한 로타바이러스 감염 위장관염 환자의 임상양상

최석주,전세윤,김승수,박경배,김용배,박준수 순천향의학연구소 2006 Journal of Soonchunhyang Medical Science Vol.12 No.1

..

요석 환자에서 대사 이상의 평가

이석영,서정원,윤석중,이상철,김용태,김원재 충북대학교 의학연구소 2001 忠北醫大學術誌 Vol.11 No.2

연구목적: 요석은 대사적 질환의 일종이라 할 수 있으며 이는 소변의 유체 역학의 장애나 혹은 배설되는 대사 산물의 생화학적 불균형으로 초래하게 된다. 따라서 본 연구에서는 24시간 요검사를 통하여 요석 환자들에서 요중 대사적 이상에 대해 알아보고자 하였다. 대상 및 방법: 연속적으로 내원한 재발성 요석 환자 151명(남자 114명, 여자 37명)을 대상으로 하였으며, 요석이 완전 치유된 후 최소 3개월이 지나고 24시간 소변을 채취하여 요량, 나트륨, 인, 요산, 칼슘, 마그네슘, 수산 및 구연산에 대하여 분석하였으며 대사 이상의 종류 및 빈도를 조사하였다. 결과: 요석 환자들에서 가장 호발하는 대사적 이상은 저구연산뇨증(47.1%)이었으며 다음으로 고나트륨뇨증(43.2%), 저소변량(30.5%), 고칼슘뇨증(23.5%), 고요산뇨증(22.1%), 고수산뇨증(10.7%), 그리고 저마그네슘뇨증(9.4%) 순이었다. 151명의 환자 중 적어도 한가지 이상의 대사 이상이 136명에서 관찰되었다. 결론: 요석 환자들에서 요중 대사 이상은 90.1%에서 관찰되었으며 저구연산뇨증과 고나트륨뇨증이 요석의 생성과 재발에 중요한 역할을 하는 것으로 조사되었다. 이러한 요중대사적 평가는 요석 환자의 진단 및 예방에 유용하게 이용될 수 있을 것으로 사료된다. Purpose: Urolithiasis is a metabolic disease which arises from disturbances of the physico-chemical balance or the hydrodynamic system of the urine. This study was to determine the metabolic abnormalities through the 24-hour urine examination in patients with urolithiasis. Materials and Methods: The 24-hour urine specimens of 151 RSF (114 men, 37 women) were analyzed for volume, sodium, phosphorus, uric acid, calcium, magnesium, oxalate, and citrate. The incidence and frequency of metabolic abnomalities in RSF were determined. Results : The most frequent metabolic abnormality in RSF was hypocitraturia (47.1% ), followed by hypernatriuria (43.2%), low urine volume (30.5% ), hypercalciuria (23.5%), hperuricosuria (22.1%), hyperoxaluria (10.7%), and hypomagnesiuria (9.4%). At least one metabolic abnormality was found in 136 out of 151 RSF. Conclusion : Our results showed that RSF had metabolic abnormalities were found up to 90.1% of them. Hypocitraturla and hypernatriuria could play an important role in the development and recurrence of urolithiasis. This data suggested that metabolic evaluation might be the useful tools for urolithiasis detection and prevention.

진성 복압성 요실금 환자에서 복강경하 방광경부현수술의 유용성: 타술식과의 비교 연구

김용태,엄민식,이석영,신관희,서정원,윤석중,이상철,김원재 충북대학교 의학연구소 2001 忠北醫大學術誌 Vol.11 No.2

연구목적: 진성 복압성 요실금의 치료법으로서 복강경을 이용한 Burch 수술을 타수술법과 비교하여 그 유용성을 알아보고자 하였다. 대상 및 방법: 진성 복압성 요실금을 주소로 본원 비뇨기과에서 수술을 시행받은 44명의 환자를 수술법별로 분류하여 수술법에 따른 성공률, 수술 시간, 입원 기간 및 합병증의 빈도를 비교 분석 하였다. 결과: 전체 환자에서 수술 성공률은 86.4% 였으며 이들 중 복강경을 이용한 Burch 수술군에서는 성공률이 100% 이었다. 복강경을 이용한 Burch 수술군은 타수술군에 비하여 입원 기간이 짧았다. 복강경을 이용한 Burch 수술군은 합병증이 매우 경미하였으며 전체 환자의 31.8%에서 단기간의 배뇨곤란을 호소하였으나 장기간의 배뇨곤란은 없었으며 슬링 수술군에서는 3례(16.7%)에서 심한 절박성 요실금을 호소하였다. 결론: 복강경을 이용한 Burch 수술은 높은 치료 성공률과 낮은 합병증의 빈도를 나타내어 진성 복압성 요실금의 치료에서 매우 우수한 수술법으로 사료된다. Purpose: We performed this study to investigate the usefulness of laparoscopic Burch colposuspension as a treatment of genuine stress incontinence compare to other anti-incontinence operation. Materials and Methods : We analyzed success rate, operation time, admission day, and complication rate of various anti-incontinence operations in 44 genuine stress incontinence patients who have been received operation in our hospital. Results : Overall success rate was 86.4%, but laparoscopic Burch coposuspension showed 100% success rate. Laparoscopic Burch colposuspension required shorter admission day compared to other anti-incontinence oparations. Complication rate was lower in laparoscopic Burch colposuspension group. Short-term voiding problems were identified in 31.8% of total patients but 3 patients(16.7%) who have received sling operation complained severe urge incontinence. Conclusion : Laparoscopic Burch colposuspension is considered as an effective surgical method for genuine stress incontinence due to high success rate and low complication rate.

폴리스타이렌 아이오노머와 액정중합체 블렌드의 기계적 성질

김희석,김준섭,최재곤,박기주,윤용국,진정일 조선대학교 생산기술연구소 1997 生産技術硏究 Vol.19 No.1

The dynamic mechanical properties of thermotropic liquid crystalline polyester (LCP) blends with polystyrene (PS) and Li sulfonated polystyrene (PSSLi) were investigated. It was found that PS forms an immiscible blend with LCP. However, above the matrix T_(g) of the PS, the addition of the LCP increases the modulus of the blend significantly because the LCP acts as filler below its T_(g). In PSSLi/LCP blend system, it was also found that, in the temperature range between two T_(g)s of the ionomer, the LCP acts as filler and thus increases the modulus of the blend. However, the filler effect of the LCP on the modulus decreases rapidly with increasing temperature and disappears above the T_(g) of the LCP. Finally, it was suggested that the PSSLi may be partially miscible with the LCP via ion-dipole interactions between a Li^(+) cation of the PSSLi and a carbonyl group of the LCP.

J-R 곡선에 대한 시편크기의 영향에 관한 연구

조연제,석창성,김영진,양원호,최용식 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.1

The objective of this paper is to investigate the constraint effect on fracture resistance curves. A series of fracture toughness tests with different specimen sizes taken from nuclear piping materials(SA312 TP347 SA516 Gr. 70) were performed. Test results show that fracture toughness is increased with increase in specimen size, probably due to the relaxation crack tip constraint. Elastic-plastic finite element analyses were also performed to investigate the constraint effect. Numerical results show that the stress triaxiality at the crack tip is the governing factor for fracture toughness.

하악 이부에 생긴 Angiolymphoid hyperplasia with eosinophilia(Kimura's disease)의 치험례

양윤석,조용석 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.3

Angiolymphoid hyperplasia with eosinophilia(ALHE) is an uncommon, benign vascular proliferation with the background of a stroma which is heavily infiltrated by lymphocytes and eosinophils and includes lymphatic follicles with prominent germinal centers. ALHE primarily involves the skin and subcutis in head and neck as various forms of nodules. There has been considerable controversy about the relationship between ALHE and Kimura's disease. Kimura's disease, originally reported by Kimura et el., is an unusual granulation with proliferation of lymphoid tissue. Wells and Whimster published the first report describing a condition that resembled Kimura's disease and designated it as ALHE. For a time being two lesios are thought to be same lesion, but recently they are considered as two different entities, histopathologically. The cause of this disease remains unknown, and physicians have used a variety of treatment modalities including cryosurgery, steriod therapy, electrodesiccation, curettage, radiotherapy, laser therapy and surgical excision. But any treatment modality leaves problem of recurrence because the lesion is not well encapsulated. Being poorly encapsulated, the lesion's remnants are apt to be left and this markes some problems : recurrence and possible adjacent organ injury. In this case we misdiagnosed the lesion as well encapsulated benign mass. We performed excisional biopsy and experienced prolonged operation time and unwanted mentalis muscle injury. We think that the importance of poor encapsulation of ALHE should be stressed. So we report our experience with literature review.

석청(Mad-honey) 복용 후 유발된 부정맥 1예

김용철,김남호,김승환,최준호,박은미,이상재,이은미,유남진,윤경호,오석규,정진원 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2

석청에 포함된 grayanotoxin에 의해 독성 작용이 나올 수 있으며, 이러한 독성 작용은 일반적으로 24시간 이내 저절로 회복된다. 최근에 본 저자들은 석청 복용 후 발생한 심실빈맥을 경험하였기에 보고하는 바이다. 49세 남자가 호흡곤란으로 내원하였으며, 내원당시 분당 40회 정도의 동성 서맥이 관찰되었고, 수액을 투여하던 중 심실 빈맥이 발생하였다. 항부정맥제를 투여 후 정상 동율동으로 전환되었으며, 특별한 이상 없이 4일 후 퇴원하였다. Mad-honey intoxication caused by the consumption of honey producted from the nectar of rhododendrons. The grayanotoxins cause the intoxication. The toxic effects of mad-honey poisoning are rarely fatal and generally last for no more than 24 hours. We experienced one case, a 49 years-old man who presented with dyspnea after ingestion of mad-honey. He showed marked sinus bradycardia with < 40 beats per minute on admission. The cardiac rhythm was changed to ventricular tachycardia immediately. These features resolved completely in 24 hours with continuous infusion of amiodarone(600 mg per day) and fluids. We report the case of intoxication of mad-honey as a presentation of fatal cardiac arrhythmia.