분산 데이터베이스 환경에서의 빠른 트랜잭션 처리를 위한 분산 확장형 이타적 잠금 기법을 이용한 스케쥴러의 설계

류봉수,김응모 成均館大學校 科學技術硏究所 2002 論文集 Vol.53 No.1

분산 데이터베이스에서 장기 트랜잭션 발생시 과도한 장기간 데이터 점유로 인한 트랜잭션 처리 성능의 저하를 초래하게 된다. 따라서 단기 트랜잭션은 장기 트랜잭션으로 인한 지연이 없이 데이터베이스를 빨리 접근하여야 한다. 본 논문에서는 분산데이터베이스 환경에서 동시성 제어를 위한 향상된 트랜잭션 스케쥴링 프로토콜을 제안한다. 좀 더 확장된 직렬성(Selializability) 표기를 가진 이타적 잠금기법(Altruistic Locking)을 사용하여 분산 데이터베이스 시스템에서 적용하였다. 이타적 잠금기법은 기부를 통하여 트랜잭션이 더 이상 그 객체를 요구하지 않을 때 다른 트랜잭션들이 객체를 로크할 수 있도록 미리 객체에 대한 로크를 해제함으로써 트랜잭션들의 대기시간을 줄이기 위해서 제안된 것이다. 확장형 이타적 잠금기법은 처음에 기부되지 않는 객체까지도 처리하는 좀 더 완화된 기법이다. 본 논문에서 제안한 새로운 트랜잭션 스케쥴링 기법은 확장형 잠금 기법을 기초로 분산 데이터베이스 내에서 트랜잭션 처리 전에 분산 데이터베이스 시스템의 외부에 별도의 트랜잭션 스케쥴러(External Scheduler for Distributed Database System(EsDDS))를 두어 단기 트랜잭션과 장기 트랜잭션을 구분하여 각각의 특성에 맞게 다른 데이터베이스 접속을 허가하게 되어 직렬성과 동시성 제어를 동시에 만족한다. 그리고 분산 데이터 시스템 장기 트랙잭션에 인해 유발 가능한 단기 트랜젝션의 장기적 대기현상을 최소화하도록 줄임으로써 동시성 제어의 정도를 높일 수 있는 새로운 확장형 이타적 잠금기법을 이용한 외부 스케쥴링 기법을 연구한다. We propose an advanced transaction scheduling protocol for concurrency control of Distributed databases in Distributed. Performance declension has arise to long-time possession of Long-lived Transaction. So short-lived transaction must quickly access database without any delay by long-lived one. We adapted Altruistic protocol, namely more extended syntax-oriented serializability notions, to Distributed Databases in Distributed Network Environment. Altruistic locking, as an advanced protocol, has attempted to reduce delay effect associated with lock release moment by use of the idea of donation. An improved form of altruism has also been deployed for extended altruistic locking. This is in a way that scope of data to be early released is enlarged to include even data initially not intended to be donated. Our protocol is based on extended altruistic locking, but a new Scheduling method, namely External Scheduler for Distributed Database System(EsDDS), is additionally used in order to satisfy serializability requirements and concurrency. With we research external scheduling method of extention with regard to XAL in a way that short-lived transaction are not also vulnerable to tolerate long-duration waiting

多指症의 臨床的 硏究

류봉수,곽승호,김환익,이삼용,조백현 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.4

多指症의 臨床的 考察

류봉수,곽승호,김환익,이삼용,조백현 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.4

하구순 편평상피암의 절제후 재건 치험례

류봉수(Bong Su Ryu) 대한두경부종양학회 1996 대한두경부 종양학회지 Vol.12 No.1

Since the upper lip does not receive direct actinic radiation, only 5% of lip tumors develop in the upper lip, while the lower lip is the site of the remainder. Among the lower lip cancer, squamous cell carcinoma is the most common tumor, especially the vermillion border of lower lip is the most common site. The aims of reconstruction of the lip are both aesthetic effect and functional restoration and the ideal procedure must produce a aesthetically normal, not-tao-tight lip and a good sensation and muscle tone of the lip. We have a satisfactory reconstruction of a subtotal loss of lower lip after squamous cell carcinoma extirpation using Gillies fan flap and the case is presented with reviewing a many published reports.

경부 구축성 화상 반흔 환자에 관한 임상적 고찰

류봉수,이삼용,김광석,조백현,김대영 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.6

The looseness of the cervical skin, as well as the range of mobility of the neck may facor wound contracture during trauma and burn wound healing. The deformity may range from a thin tight web to a massive dense fibrosis, with contracture pulling the chin downward and fixing it near the sternum. The excessive scar contracture of the neck following burn may be accompanied by functional or cosmetic disability. Replacement of scared skin pon the anterior neck has presented a most difficult problem to the plastic surgeon. A retrograde study was performed in order to analyse and evaluate the operation results of the 48 cases of the cervical burn scar contracture patients, who were treated in our hospital over last 10 years, in various view points. The amount of contracture occurring in a full-thickness burn of the neck usually depends on several circumstances. Early splinting help to minimize the contracture of the burned neck. Comparison between the results obtained by tissue expansion technique and scapular free flap and those by previous techniques, thick split thickness and full thickness skin graft have found almost universal acceptance as a mean s of skin replacement in the correction of the scar contractures. Skin graft on the neck has been something less satisfactory than tissue expansion and fre flap. And the author applies an adjustable splint which was to be worn for about 6 months to keep the neck extended and pressure on the neck.

내시경을 이용한 눈썹-전두부 거상술

류봉수,이명주,양정열 大韓成形外科學會 1997 Archives of Plastic Surgery Vol.24 No.2

Aging process of the forehead in human reflects imbalance of the forehead muscles, forehead ptosis including eyebrow, and winkles of the forehead and glabella. Forehead lifting through bicoronal incision was adopted as an universal method to correct these problems of the aging process. In a view of the aesthetic surgery, however, there are several problems such as large scar. alopecia, and numbers beyond the incision line in the scalp for the correction of the forehead aging stigma. During the part few decades, minimally invasive technology forced many surgical specialities to undergo dramatic changes. In plastic & reconstructive surgery also minimally invasive technology using endoscope gave many advantages. Therefore it has reduced morbidity rates and got greater patient acceptances for the forehead lifting. When we perform endoscopic brow-forehead lift to get a good results in oriental people, 1. it needs a extended periorbital dissection. 2. We have to concern lift in the lateral part of forehead rather than in medial forehead. 3. it needs more aggressive tissue modifications (e. g. myotomies, neurotomy) 4. int needs more strong fixation such as permanent microscrew fixation or cortical bone drill hole technique. We performed 13 cases of the eyebrow-forehead lifting by using endoscope from August 95 to September 96, followed up them from 3 to 12 months and obtained satisfactory result. We would like to report our experience with literature review.

이하선에 발생한 유육종증의 치험례 : 증례보고

양정열,오형근,류봉수 大韓成形外科學會 1996 Archives of Plastic Surgery Vol.23 No.1

Sarcoidosis is a granulomatous disease of the undetermined etiology. It appears worldwide and is common in the Western Conturies. The prevalence is from 10 to 40 per 100,00 in the United States and in Europe. Sarcoikosis is rare in the Orient except for Japan. Recently, there has been a sharp increase in the number of case reports on sarcoidosis in korea as reported in the korean journal of Dermatology and Korean Journal of Medicine. Therefore, we studied a case of sarcoidosis involving parotid gland in a 45 years-old female. Clinical review and laboratory relationships have confirmed the findings of characteristic noncaseating epitheloid granulomas in biopsied parotid gland and increased serum angiotensin-converting enzyme. In Korea, sarcoidosis was a rare disease, first reported by Koe at all in 1968, however, today it has shown an increasing trend similar to that of Japan. The number of sarcoidosis reported in korea were 33 cases up to 1991, and about 40 cases up to 1994. The patient presented in this paper was the first proved case of sarcoidosis involving parotid gland in Korea. She was treated with superficial parotidectomy and lymph node removal.

흰쥐 적출대동맥의 자외선 유발 기계적 반응시 cAMP 및 cGMP의 농도변화

류봉수,안호범,김대영,이삼용,조백현,백영홍 大韓成形外科學會 1994 Archives of Plastic Surgery Vol.21 No.4

When the isolated thoracic aortae of rats were contracted with 1 or 10 μM phenylephrine (PE), ultraviolet(UV) light irradiaion produced the contractile and relaxant and relaxant responses in preparations with and without endothelium, respectively, 1μM ACh relaxed PE-induced contraction in the intact endothelial preparation, but did not in the denuded one. On the other hand, nitroprusside (NP) and isoproterenol(ISP) produced relaxing resposes irrespective of the presence of the endothelium. In the Endothelium - intact preparation, ACh potentiated the UV light-induced contraction, but ISP did not. Both agents did not affect the UV light-induced relaxation in the denuded preparation. The cGMP level in tissue was decreased by removal of the endothelium, but the cAMP level was not. In both preparations with and without the endothelium combined treatment with NP 1μM after PE 10μM markeldly increased the cGMP level. However, combined treatment with PE 10μM + ACh 1μM increased cGMP level in the intact preparation only, and UV light irradiation for 3 min reduced the increment. Single treatment with PE 10μM and combined treatment with PE+ISP for 5min or PX+UV irradiation did not affect the cGMP level. And cAMP level of the intact endothelial preparation was increased in combined treatment with PE 10μM+ISP 1μM but not altered in any of the other conditions. These resluts suggest followings : ① UV light produces contraction of the rat thoracic aorta in endothelium-dependent fashoion, ② cAMP is not a factor to this response, ③ the UV light-induced relaxation is not related to the cGMP and the cAMP level in the tissue.

體育의 認識과 關心에 관한 硏究 : of the high school students 高校生을 中心으로

柳鳳秀 건국대학교 1983 論文集 Vol.17 No.1

The purpose of this study is to provide the useful data for theoretical grounds to improve the current system of physical education and extracurricular activities. This study has been conducted with 242 students of Kun Kuk High school, using a questionaire for each of them. The results are fellows 1.Most of the students were not concerned with physical education but only with the subjects related with the college entrance examination. 2.Of all areas of physical education, both male and female students showed interest in ball games. 3.The greater part of students are all concerned for increasing class hours of physical education. 4.Both male and female students want more sports equipment. 5.Most students generally think that physical trianing test marks were far from fair. 6.Most male and female students think physical activities is good for their health. They are dissatisfied with the marks of the physical strength measurement and so they want the method of giving grades to be changed.

과민성 장증후군 환자의 위장관 증상과 우울, 불안과의 상관관계 연구

허봉수,최서형,류영수 대한한방내과학회 2019 大韓韓方內科學會誌 Vol.40 No.4

Objective: This study was designed to assess the correlation between gastrointestinal symptoms, depression, and anxiety in patients with irritable bowel syndrome (IBS). Method: New patients who visited the ⃝⃝ Oriental Hospital completed standardized questionnaires. These consisted of questionnaires for IBS based on Rome Ⅲ criteria, the Gastrointestinal Symptom Rating Scale (GSRS), the Beck Depression Inventory (BDI), and the Beck Anxiety Inventory (BAI). Results: A total of 103 patients participated. Among them, IBS was observed in 42 patients. There was a weak correlation between GSRS and BDI, but it was not statistically significant. There was a statistically significant weak correlation between GSRS and BAI. The main symptom factors affecting BAI were borborygmus, increased flatus, sucking sensations in the epigastrium, and abdominal distension. Conclusion: There was a statistically significant correlation between gastrointestinal symptoms and anxiety in patients with irritable bowel syndrome.