하안검에 발생한 원발성 점액샘암종의 치험례

홍승은,강소라 이화여자대학교 의과학연구소 2008 EMJ (Ewha medical journal) Vol.31 No.1

Background: Primary cutaneous mucinous carcinoma of the eyelid is an adenocarcinoma of the eccrine glands. These tumor is a rare ocular adnexal neoplasm that has a predilection for the periorbital and scalp region. It is more common in men and occur primarily in 50-70 year-old age range. We present the occurrence, clinical and histological features, and management of this tumour in a old male, who could exclude the presence of primary mucinous carcinoma elsewhere by extensive systemic evaluation. Methods : A 67-year-old male presented with a small nodular erythematous nontender left lower lid lesion, which had increased in size and pigmentation over four years. Pneumoconiosis was noted on preoperative chest CT, but it was correlated with his occupational history. Lymphatic involvement was not noted on physical examination. So he underwent wide local excision with frozen section control of the margins. Clear margin were achieved and the defect was repaired with a local rotation flap. Results : Histologic examination showed mucinous carcinoma of the eccrine glands. A whole body screening test(PET) was performed to excluded the presence of primary mucinous carcinoma elsewhere metastating to the eyelid, or any distant spread from the eyelid lesion. PET demonstrated mildly increased hypermetabolism in both lungs and hypermetabolic lymph nodes at both supraclavicular areas and mediastinum. But extensive systemic workup, including abdominal ultrasonography, upper and lower gastrointestinal endoscope, neck CT, and lung biopsyrevealed no other abnormal lesion. Immunohistochemical markers including CEA, S-100, CK-PAN, CK7, CK-20, TTF-l were also helpful in establishing the diagnosis of the primary cutaneous mucinous carcinoma of the skin. There has been no recurrence of tumor 2 months following excision.

Rice Body Tenosynovitis without Tuberculosis Infection after Multiple Acupuncture Procedures in a Hand

홍승은,박지현,서현석,강소라,박보영 대한성형외과학회 2015 Archives of Plastic Surgery Vol.42 No.4

후경골 동맥 천공지 지방 근막 섬피판을 이용한 전경골부의 재건

홍승은,변재경 대한성형외과학회 2007 Archives of Plastic Surgery Vol.34 No.3

Purpose: The coverage of distal soft tissue defects and bony exposure of the lower extremity has long been recognized to be difficult clinical problem. Covering with a local skin flap is usually impractical because of the extensive and deep crush, hence free flap has been used commonly for the coverage of the wound. Although it can provide good results, it has many disadvantages. Designing an adipofascial flap raised on perforating vessels of the posterior tibia artery is a reliable and simple method to perform, and it can solve these problems.Methods: From May 2005 to May 2006, 8 patients underwent reconstruction of lower leg defects utilizing various type of the posterior tibial artery perforator adipofascial flaps. The flap provided a durable and thin coverage for the defect, as well as a well vascularized bed for skin grafting.Results: The flap size ranged 15-80cm2, and skin graft was done for the recipient site. The flap were successfully used for the lower extremity reconstruction in most cases. Minor complications occurred in 4 cases. There was no functional disability of the donor site with esthetically pleasing results. Furthermore, these flaps were both easy to raise and insured sufficient arterial blood supply.Conclusion: We believe there are many advantages to this posterior tibial artery perforator adipofascial flap and that it can be highly competitive to the free flaps in the lower extremity reconstruction.

멜라토닌이 백서의 임의형 등피판 생존에 미치는 영향

홍승은,김양우,범진식,강소라 대한성형외과학회 2008 Archives of Plastic Surgery Vol.35 No.6

Purpose: In skin flap surgery, surgeons often encounter distal ischemia of the flap. If a powerful free radical scavenger is used, it may reduce the formation of free radical and improves the survival of flap. Thus, the present study purposed to examine whether the survival of flap can be enhanced by administering melatonin, which is known to be a powerful free radical scavenger a antioxidant molecule. Received July 22, 2008 Revised August 26, 2008 Accepted September 8, 2008 Address Correspondence: Yang Woo Kim, M.D., Department of Plastic and Reconstructive Surgery, Ewha Womans University Mokdong Hospital, 911-1 Mok-dong, Yangcheon- gu, Seoul 158-710, Korea. Tel: 02)2650-5149/Fax: 02)2651- 9821/E-mail: ywkim@ewha.ac.kr Methods: We divided 40 Sprague-Dawley rats into 4 groups, 10 in each group. For the control group(n=10), we intraperitoneally injected only carrier solution once 30 minutes before the operation, and once a day for 7 days from the day of operation. Among the experimental groups, a group(n=10) was administered with dimethyl sulfoxide(DMSO), in another group(n=10), melatonin was intraperitoneally injected, and in the other(n=10) melatonin was intraperitoneally injected and applied topically(2cc of 1% melatonin) to the operation site. Caudally based skin flaps measuring 3×10cm2 were elevated on the mid-dorsum of the rats. and then repositioned. On the seventh postoperative day, the survival area of the flap was measured and tissues were examined under the light microscope. Results: The control group, the DMSO group, the melatonin administration group and the melatonin administration and application group showed the mean survival rates of 55.26±9.2%, 70.29±7.47%, 81.45± 4.14% and 86.1±1.52%, respectively, for 30cm2 of flap. Compared to the control group, the experimental groups showed a significantly high increase in survival area at significance level of 95%. Conclusion: In this study, the survival rate of flap was enhanced through the administration of melatonin after flap surgery. This suggests that melatonin not only functions as a powerful free radical scavenger and oxygen radical scavenger but also stabilizes and protects cells, and by doing so, enhances the survival of moderately injured ischemic sites in the distal end of flap.

백서에서 측측 미세문합된 혈관의 개존율

홍승은,변재경 이화여자대학교 의과학연구소 2007 EMJ (Ewha medical journal) Vol.30 No.1

Purpose : Microvascular anastomosis has become an essential technique m reconstructive surgery. A patent microvascular anastomosis is required for the success of a free tissue transfer. As the application of microsurgery grows, the desirability of performing an end to end and end to side anastomosis continues to be debated. This experimental study presents the comparison of patency rate of two types of microvascular anastomosis techniques : side to side anastomosis and end to end anastomosis. Methods : A comparative study was undertaken to evaluate side to side micro anastomosis technique using intraluminal catheter. In this study, two clinical metods of microvascular anastomosis were compared. We compared the patency rate and time required for anastomosis. Histological changes (postoperative 1 weeks) were also invsetigated. Results : Postoperative patency rate was 90% by side to side technique compared to 100% by end to end technique at immediate postoperative and postoperative two weeks. This study revealed that there was no significant difference in patency rate among end to end suture method group and side to side suture method group. Microscopically, we found the relatively smooth surface of the anastomosis site with endothelial regeneration and partial hyaline degeneration in the group using side to side anastomotic method. Conclusion : We believe there are many advantages in this side to side technique by using intraluminal catheter in perforater flap field and can be highly competitive to the other microvascular anastomisis techniques.

둔부재건을 위한 천공지피판의 다양한 도안

홍승은,변재경 대한성형외과학회 2007 Archives of Plastic Surgery Vol.34 No.2

Purpose: The gluteal artery perforator flaps earned its popularity in buttock reconstruction due to the lower morbidity of the donor site and the flexibility in the design. Speedy and safe reconstruction is important for the success of buttock reconstruction. If a proper design is selected, satisfactory results can be obtained with more simple method of surgery. Methods: Between April 2005 and April 2006, buttock reconstruction by using gluteal artery perforator flaps were performed on sacral sores(6 cases), ischial sores(2 cases) and malignant melanoma on buttock(1 case). Various designs depending on the location and the size of the defect was made. In those designs, perforator was used as an axis for the minimal dissection of the vessel. Donor site from which sufficient amount of soft tissue can be transferred was selected, and also not causing high tension against the recipient site during the donor site closure. In addition, postoperative aesthetics, and the possibility of another design of a second operation which can be necessary in the future, was considered.Results: Patient follow up was for a mean period of 10.8 months. All flaps survived except for one that had undergone partial necrosis. Wound dehiscence was observed in one patient treated by secondary closure. Most patients presented with cosmetically and functionally satisfying resultsConclusion: By designing the flap using the perforator as an axis, depending on the defect size and degree, reconstruction can be performed with only a small tension to the donor and the recipient site. And the minimal perforator dissection allowed easier and faster reconstruction. Selection of a proper design is the key procedure which greatly affects operation time and result success.

표준 기술동향 - 60GHz 주파수 대역 기반 밀리미터파 무선전송기술 표준화 동향

홍승은,이우용,정현규,Hong, Seung-Eun,Lee, U-Yong,Jeong, Hyeon-Gyu 한국정보통신기술협회 2010 TTA저널 Vol.130 No.-

밀리미터파 활용 5세대 이동통신 기술 개발 동향

홍승은,김일규,방승찬,Hong, S.E.,Kim, I.K.,Bang, S.C. 한국전자통신연구원 2013 전자통신동향분석 Vol.28 No.6

최근 모바일 스마트 기가 및 서비스의 새로운 패러다임 진화에 따른 초연결(Hyper connection) 사회로의 진입과 빅데이터 출현으로 인해, 모바일 트래픽은 해마다 2배씩 증가하여 10년 뒤 1,000배 이상 증가할 것으로 예상하고 있으며, 이처럼 급격히 증가하는 모바일 트래픽 증가로 인해 모바일 망 사업자의 부담이 가중되고 있다. 추가 주파수 확보가 제한된 기존의 4G 이동통신으로는 이러한 모바일 트래픽 폭증에 따른 1,000배 용량 증대를 수용할 수 없고, 따라서 광대역폭 확보가 가능한 밀리미터파 기반의 5세대 이동통신 기술 개발이 전 세계적으로 시작되고 있다. 본고에서는 비/저활용 되어 왔던 밀리미터파를 개척하여 5세대 이동통신 기술로 활용하는 기술 개발 동향을 살펴본다. 특히, 한국전자통신연구원에서 진행하고 있는 '중추 네트워크 원전기술 개발 과제' 내용을 중점적으로 소개하고자 한다.

TDD MAC 프로토콜 설계 기술

홍승은 대한전자공학회 2002 대한전자공학회 워크샵 Vol.2002 No.10

ATM 상에서 실시간 가변비트율 MPEG-2 동영상 서비스를 위한 고속 자원 재할당 프로토콜

홍승은,장경훈,김덕진,고성제 한국통신학회 1999 韓國通信學會論文誌 Vol.24 No.8

ATM과 같은 고속 패킷교환 망의 도입은 일정한 화질을 갖는 동안 동영상 서비스를 가능하게 하였다. 망 자원 사용의 효율성과 화질 사이의 타협이 절실히 요구되는 현 상황에서, ATM Forum과 ITU-T에서 정한 고정된 트래픽 기술자(Traffic Descriptor)로는 이를 만족시킬 수 없다. 따라서 본 논문에서는 동영상 세션을 발생된 트래픽에 따라 시간적으로 분할하여 각 구간에서 발생되는 트래픽을 효율적으로 기술할 수 있는 트래픽 기술자를 설정한 후, 망과의 협상을 통해 망 자원을 재할당하고 재할당된 자원에 트래픽을 적응시키는 고속 자원 재할당 프로토콜(Fast Resource Reallocation Protocol: FRRP)을 제안한다. 또한 FRRP가 효율적으로 운용될 수 있는, MPEG 부호화 알고리즘과 망 제어가 통합된 시스템 모델을 제안하고 실제 동영상 트래픽(Star Wars)을 사용한 시뮬레이션에 의해 셀 손실율 관점에서 FRRP의 성능 평가를 수행한다. 실험 결과는 고정된 트래픽 기술자 사용 시 발생하는 셀 손실율의 5∼35% 정도만을 나타내었다. The introduction of fast packet switching networks such as the ATM leads to the possibility of video services with constant quality. However, the fixed traffic descriptor(TD), which is defined by ATM Forum and ITU-T, can not simultaneously satisfy network efficiency and video quality. This paper presents fast resource reallocation protocol (FRRP) which can provide an effective compromise between network efficiency and video quality. This protocol reallocates the network resources and then adapts the traffic to the reallocated resources. In the proposed method, a video session is divided into several time-intervals according to its generated traffic and TD is calculated which well characterizes the traffic during the specific subdivided interval. In addition, a system model, where MPEG coding algorithm and network control are unified, is proposal and the performance of the FRRP in terms of cell loss rate(CLR) is evaluated though the simulation using real video traffic(Star Wars). Simulation results show that the FRRP has only 5 ~35% CLR of the fixed TD.