2 차원 필터에 대한 빠른 패킷 분류 기법

정상훈(Sang-Hun Chung),윤현수(Hyunsoo Yoon),조정완(Jung-Wan Cho) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1C

패킷 분류는 품질보장(QoS), VPN(Virtual Private Network), 고성능 방화벽(high speed firewall), 인터넷 사용료 부과(pricing)를 제공하는 차세대 라우터에 반드시 필요한 기능이다. 라우터는 송신 주소, 수신 주소, 프로토콜 타입, 혹은 포트 번호와 같은 패킷 헤더의 여러 필드를 주어진 필터 리스트와 비교하여 패킷을 분류한다. 기존에 제시된 하드웨어 기반의 패킷 분류 기법은 빠른 검색 시간을 제공하지만 확장성과 테이블 갱신 면에서 문제점이 있다. 본 논문에서는 하드웨어 기반의 빠르고 확장성있고 갱신이 가능한 2차원 필드 검색 기법을 제시한다. 차후 연구에서는 본 기법을 보다 면밀히 분석하고 다차원 필터 검색이 가능하도록 확장한 기법을 제시하겠다.

5 축 고속가공기용 공구고정장치를 이용한 공구통합관리시스템에 관한 연구

정상훈(Sang Hun Chung) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.5

근막-변성근이식이 흰쥐의 좌골신경재생에 미치는 영향 : 근막도관의 효과

정경설,이종건,임풍,정상훈 大韓成形外科會 1994 Archives of Plastic Surgery Vol.21 No.1

Recently, it has been observed that the layer of basal lamina surrounding each skeletal muscle fiber enhances regeneration of the axons. Keynes introduced degenerated muscle graft, as an alternate strategy of nerve graft for the peripheral nerve gap in 1984, and then extensive studies by Glasby and his coworkers showed that coaxially aligned, degenerated muscle graft was as effective as nerve graft. But the muscle segments tend to be fragmentary and fragile in process of degeneration, and so degenerated muscle graft is technically difficulty and the grafted segment can be disrupted during healing process. The aim of this study is to solve these problems and promote the effect of regeneration by grafting the degenerated muscle entubulated with its fascia on the peripheral nerve defect. Forty-five Sprague-Dawley adult rats were divided into three groups : The nerve grafted group(n = 15), in which a 10mm length segment of autogenous nerve was grafted to the 10mm length nerve defect on the left sciatic nerve, the degenerated muscle grafted group(n = 15), in which a 10mm length segment of degenerated muscle treated with freezing and thawing was grafted coaxially to the nerve defect, and the degenerated muscle and fascia grafted group(n = 15). in which a 10mm length segment of degenerated muscle entubulated with its fascia was grafted to the nerve defect. The effects of fascial entubulation of the degenerated muscle were observed andevaluated by gross findings electrophysiologic examination, and histological examinations at the 60th postoperative day. The result obtained were as follows. 1. Sensory and motor function were recovered for 80% in the degenerated muscle and fascia grafted group, 86.7% in the nerve grafted group and 69.2% in the degenerated muscle grafted group. 2. Disruption of the grafts and neuroma formation were developed in 2 cases among the degenerated muscle grafted group. 3. Nerve conduction velocity of the regenerated sciatic nerves in the degenerated muscle and fascia grafted group was 9.91 ±2.17 m/s and was faster than that of the degenerated muscle grafted group(8.17 ± 1.10m/s) (P <0.05), but similar to that of the nerve grafted group(10.8 ±4.14m/s). 4. Total number of the myelinated axons infiltrated into the grafts in the degenerated muscle and fascia grafted group was 3734.7 ± 320.1 and this number was larger than that of the degenerated muscle grafted group(3026.5 ±343.1) (P<0.01), but similar to that of the nerve grafted group(3680.4 ±280.8). Total number of the myelinated axons in the distal segments was 1821.7 ± 177.3 for the nerve grafted group and 1635.9 ± 191.7 for the degenerated muscle grafted group. The results from this experiment suggest that degenerated muscle graft entubulated with its fascia would promote axonal regeneration more than degenerated muscle graft only. And this method is easier to maintain the graft during and after the operation. We concluded that this improved method of degenerated muscle graft could be of use in the repair of human peripheral nerve injuries.

결막에 발생한 악성 흑색종의 치험례

정경설,김영진,임 풍,정상훈 大韓成形外科學會 1992 Archives of Plastic Surgery Vol.19 No.6

The melanoma is a malignant tumor that may arise from any cell of the body capable of forming melanin ; it is most common on the skin and less so in the eye. Moreover, the malignant melanomas of the conjunctiva are really rare. Two cases of malignant melanoma of the bulbar conjunctiva are presented. In clinical observation, dark brownish, strawberry-like peduncleated mass was noted in bulbar conjunctiva. The first case of 67 years old woman was treated with wide resection and orbital exenteration, and the ocular defect was covered with temporalis muscle transfer and skin graft. The second case of 44 years old woman was treated with wide excision of full layer of the lower eyelid and the eyelid defect was reconstructed with cheek rotation flap and septal cartilage graft. The prognostic and therapeutic problems are discussed in the light of the present opinion and a brief review of the literature was described.

완전 구순구개열 환자에서 구순접합술과 구개보조기를 이용한 동시치료의 치험례

이종건,정상훈 大韓成形外科學會 1996 Archives of Plastic Surgery Vol.23 No.5

The methods of management of cleft lip and palate have been developed for several centuries. But there were great debates upon the protocol of management schedule, such as operation time, operative techniques and orthopedic controls. In the recent year, early normalization of the congenital defect has become the focus of contemporary cleft lip and palate care. In the wide unilateral clefts and in bilateral clefts, a preliminary lip adhesion has been advocated as a mean of narrowing the cleft at an early phase and of easing and improving the result of a definitive lip repair. In combination with an orthopedic appliance, the lip adhesion has the added advantage of acting as a dynamic force in aligning the upper alveolar arch. Authors carried out a combination therapy of lip adhesion with presurgical orthopedic appliance in 32 complete cleft lip and palate patients since 1990. Sequential maxillary alginate impression were obtained at 4 weeks of age during lip adhesion, at 6 months of age during definitive lip repair and at 12 to 15 months of age during palatoplasty. All maxillary impressions were taken under general endotracheal anesthesia just prior to the each surgical procedures. Dental study models were made from negative alginate impressions as permanent records. The appliances were constructed from the working study models with soft and hard autopolymerized acrylic monomer and powder. The alveolar molding appliance was discontinued at the time of palatoplasty. The results were as follows; 1. A total 32 patients, 23 patients were male and 20 patients were unilateral clefts. 2. A combination therapy of lip adhesion and presurgical orthopedic appliance was started at four weeks of age in most cases. 3. The success rates of appliance placement was 82% in unilateral cases and 86% in bilateral cases, and 70% of first and second trials totally. 4. The appliance proved alo to act as a modified excellent feeding tool by questionnaire from mothers. The weight change revealed underweight percetile by 50 at pre-appliance mostly but over the 50 percentile at 6 months of post-appliance. 5. The author's management made of rapid and dramatic forward growth of diminutive maxilla and quickly into apposition in the alveolar area. In conclusion, author's protocol is more agreeable than conventional approach of primary lip repair without presurgical orthopedic appliance in the esthetic and functional aspect. But the serial maxillary dental study models will be analyzed for assessing three-dimensional change. The longitudinal study needs for functional evaluation of maxillary and mandibular growth pattern.

탈아세틸화된 키틴이 백서 창상치유능에 미치는 영향

정상훈,조용남,조용우,고석원,위성신,유걸 大韓成形外科學會 1999 Archives of Plastic Surgery Vol.26 No.5

Chitin and chitosan, polysaccharides made up of polymeric N-acetly glucosamine and D-glucosamine, are widely found in nature, forming the skeletons of crustaceans and insects, as well as the components of bacteria cell walls. Chitin and chitosan have been known to have many useful biological properties such as biocompatibility, biodegradability, antimicrobial activity, and wound healing. There properties have been known to be different depending on the degree of deacetylation of chitin, but it has not yet been fully evaluated. The purpose of this study was to evaluate the wound healing effect by the degree of deacetylation. Full-thickness skin incision was made on the backs of Sprague-Dawley rats. Three concentrations of powder, comprising 90% chitin, 50% chitin and 10% chitin, were separately embedded in the wounds of 3 rat groups. The wound-breaking strength and the collagen-hydroxyproline content of the skin at the wound sites were measured and histological examination was performed at postoperative 3, 7, and 10 days. The 50% chitin group had the highest tensile strenght of all groups. But the 50% chitin and 90% chitin groups had the lowest collagen hydroxyproline levels among all groups. The wounds treated with 50% chitin powder were completely reepithelialized and granulation tissue in the wound was observed 7 days after initial wounding. The arrangement of collagen fibers in the skin was ordered and similar to normal skin The 50% chitin powder is considered to be the most efficient wound healing accelerator among different concentrations of chitin powder.

건의 치유

정상훈,임풍 大韓成形外科學會 1993 Archives of Plastic Surgery Vol.20 No.1

All hand surgeons recognize that peripheral adhesions are frequently associated with the tendon healing process. Although these adhesions have been considered an essential_coures of tendon healing, the frequent incidence of poor digital function follwing tendon repair has been more perplexing and frustrating to the hand surgeon. But it has stimulated a new interest in determining the factors associated with the formation of tendon adhesion, and so a tremendous amount of research has been carried out in the areas of tendon healing, nutrition, biomechanics, and the pathophysiology of tendon adhesions. Recent studies on the intrinsic, healing capacity of the tendon suggest that adhesions may constitute a nonessential inflammatory response at the site of injure and important clinical advancements have been made in suture techniques, sheath preservation or reconstruction, and the postoperative mobilization of repaired tendons. The surgical repair of injured tendons and the attempts by the surgeons to control and alter the formation of adhesions by mechanical, biochemical, and biophysical technique are based on such an understanding of the mechanism of tendon healing. This paper reviews briefly the contributions of prominent researchers in the field of tendon healing in a comprehensive series of essays reporting the current concepts in the management of these difficult injuries.

괴사성 근막염 1예

정상훈,함상희,이종육,박철종 대한피부과학회 1999 대한피부과학회지 Vol.37 No.4

Necrotizing fasciitis, first described by Wilson in 1952, is one of the most dramatic infectious diseases which develops at the level of superficial fascia and involves the overlying dermis. Clinical diagnosis is often initially confused with cellulitis, and delay in the diagnosis and treatment is associated with high mortality in the range from 30% to 70%. Early diagnosis and prompt excision of all devitalized tissue are critical because any remaining necrotic tissue will continue the rapidly progressive infectious process. We, herein, report a 64-year-old man who was presented with a typical clinical course of necrotizing fasciitis.

액취증 수술 후 상지운동 제한으로 인한 척골신경병증

정성노,임지현,권호,정상훈 大韓成形外科學會 2004 Archives of Plastic Surgery Vol.31 No.2

수용성 키틴이 백서 창상치유에 미치는 영향

강장석,조용남,정상훈,유 결,임진수,권 호,조용우,고석원 大韓成形外科學會 2001 Archives of Plastic Surgery Vol.28 No.1