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강봉수 ( Bong-su Kang ),오승근 ( Seung-geun Oh ),박승진 ( Seung-jin Park ),박대희 ( Daihee Park ) 한국정보처리학회 2010 한국정보처리학회 학술대회논문집 Vol.17 No.1
본 논문에서는 대용량의 데이터베이스에서 실시간 얼굴 인식이 가능하며 동시에 높은 인식 정확률을 보장해야만 하는 얼굴 인식 기반 출입 관리 시스템의 요구 사항을 반영하여, 새로운 형태의 다중 클래스 SVM인 혼합 계층형 SVM을 제안한다. 제안된 시스템은 대용량의 데이터베이스에 적합한 이진트리 구조를 갖는 계층형 다중 클래스 SVM과 단일 클래스 SVM을 결합한 구조로써, 실제 출입 관리 시스템을 모의 구축하여 실험한 결과, 실시간 처리가 가능한 빠른 성능과 높은 인식률을 확인하였다.
강봉수(Bong Su Kang),김종우(Jong Woo Kim) 대한외과학회 2009 Annals of Surgical Treatment and Research(ASRT) Vol.76 No.1
Purpose: The aim of this study is to analyze various clinical characteristics of gastrointestinal carcinoid tumors including their symptoms, diagnoses and treatment strategies. Methods: Medical records of 36 cases of gastrointestinal carcinoid tumors diagnosed at Bundang CHA Hospital from March 2000 to February 2008 were reviewed and analyzed retrospectively. Results: The mean age of patients at diagnosis was 50 years old. Frequent location of the tumors was as followsrectum, duodenum, appendix, stomach, colon, and small bowel. The size of tumor varied and the mean size was measured 9.0 mm. Any specific symptoms did not arise nor were they detected among most of the patients at the time of diagnosis. Endoscopic resection of gastrointestinal carcinoid tumor was undergone in 27 cases, while 13 cases were resected with surgical procedures. Surgical procedures performed were appendectomy in 4 cases, transanal resection in 3 cases, low anterior resection in 3 cases, pancreaticoduodenectomy in 1 case, duodenotomy with mass excision in 1 case, ileotomy with mass excision in 1 case. One case of recurrence was reported during the follow-up period. Conclusion: Gastrointestinal carcinoid tumors have various clinical presentations and the results are highly variable and also individualized according to the site of the primary tumor. It leads to a multiplicity of treatment options for the patients. The expertise of surgeons and endoscopic physicians should be combined for proper management strategies and effective results of carcinoid tumors of gastrointestinal tract treatment.
곡률반경의 변화와 마찰계수의 영향이 슬라이딩 코어의 접촉압력과 응력에 미치는 영향
강봉수(Bong-Su Kang),김철웅(Cheol-Woong Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The goal of total disc replacement is to restore pain-free mobility to a diseased functional spinal unit, by replacing the degenerated disc with a mobile bearing prosthesis. SB Charite Ⅲ is named commercial product as the artificial intervertebral disc. SB Charite Ⅲ consists of sliding core and top & bottom endplates made by Ultra-high Molecular Weight Polyethylene (UHMWPE) and cobalt chrome alloy, respectively. To evaluate the effect of von-Mises stress and contact pressure due to the various radius of curvatures, and 3-D finite element model such as Model Ⅰ, Ⅱ and Ⅲ is preformed by coefficient of friction (μ) and radius curvature (ρ) of sliding core. Consequently, von-Mises stress of Model Ⅲ is more 1.5 times higher than that of SB Charite Ⅲ. In spite of contact pressure of Model Ⅲ is 1.3 times more higher than that of SB Charite Ⅲ, it is can be consider that Model Ⅲ is superior to transverse crack propagation behavior.
소셜미디어 마케팅을 통한 다차원적 고객 인게이지먼트 증진: 게시물 내용과 표현 유형을 중심으로
강봉수 ( Bong Su Kang ),이규현 ( Kyu Hyun Lee ),김희웅 ( Hee-woong Kim ) 한국정보시스템학회 2015 情報시스템硏究 Vol.24 No.4
Purpose One of the main characteristics of Social Network Service(SNS) is that users in an open space makes posts through voluntary participation and sharing among them. This makes SNS a very attractive channel to companies that need to send their messages to consumers. As a matter of fact, there are many companies doing marketing activities through a platform of Fan Page as a space for corporations and consumers to act together. This study defines the values and types of companies’ advertising posts on Facebook, empirically analyzes the results of them, and investigates factors that could enhance the customer engagement. Design/methodology/approach A research model was built to demonstrate which values and types of posts were combined by corporations’ posts on Facebook and create their messages and which of those combinations would lead to high results of customer engagement. Findings The results show differences in the values of posts between the group of high customer engagement and the other group on Facebook. This study makes its contribution by conducting elaborate analysis of posts on Facebook and thus proposing marketing strategies that companies, which had difficulties with systematic marketing activities due to cost limitations, could use on Facebook.
국소형 췌소도세포증(Nesidioblastosis) 1예
강봉수(Bong Su Kang),강성일(Sung Il Kang),구혜영(Hye Young Koo),이성배(Sung Bae Lee),강혜윤(Hye Yun Kang),박석원(Seok-Won Park),정철운(Chul-Woon Chung) 한국간담췌외과학회 2008 한국간담췌외과학회지 Vol.12 No.4
Nesidioblastosis is a rare disorder, and it usually considered as a cause of neonatal hyperinsulinemic hypoglycemia. A 35 year-old-woman with hyperinsulinemic hypoglycemia was admitted in an unconscious condition. Abdominal CT, pancreas MRI and celiac angiography with an intra-arterial calcium stimulation test revealed a suspicious insulin-producing tumorous lesion in the head of pancreas. The patient underwent enucleation of the pancreas head tumor under the initial diagnosis of insulinoma. However, the tumor was confirmed histologically as nesidioblastosis that showed ductoendocrine proliferations and numerous small endocrine cell groups. Nesidioblastosis is classified into a focal type and a diffuse type, which are characterized by different clinical outcomes. The patient in our case showed a normal blood glucose level after operation, which is often the case for the focal type. Herein, we report this very rare case of adult nesiodioblastosis that was successfully treated by surgical resection.
인공추간판 슬라이딩 코어의 형상과 하중모드에 따른 응력 재분포
강봉수(Bong-Su Kang),김철웅(Cheol-Woong Kim) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
The goal of total disc replacement is to restore pain-free mobility to a diseased functional spinal unit, by replacing the degenerated disc with a mobile bearing prosthesis. SB Charite Ⅲ is named commercial product as the Artificial Intervertebral Disc (AID). SB Charite Ⅲ consists of sliding core and endplate made by Ultra-high Molecular Weight Polyethylene (UHMWPE) and cobalt chrome alloy, respectively. To evaluate the effect of von-Mises stress in AID, and three-dimensional finite element model of AID analysis was preformed for four different loading types of sliding core. Consequently, endplate was compared with a compressive preload at 400N and flexion moment at 3~9Nm. Therefore, this research has obtained result that von-Mises stress of sliding core in AID disc by radius curvature.
직접구동 평면 다관절 로봇의 동역학적 모델에 따른 피드포워드 제어의 실험적 평가
홍윤식,강봉수,김수현,박기환,곽윤근,Hong, Yun-Sik,Kang, Bong-Su,Kim, Su-Hyeon,Park, Gi-Hwan,Kwak, Yun-Geun 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.1
A SCARA type direct drive robot which can be used in the assembly operation was designed and manufactured. Graphite fiber epoxy composite material was used in the fabrication of the robot arm structure in order to improve the speed of the robot arm with a high damping effect. For model-based control and sensitivity analysis of system parameters, the dynamic model of robot arm and drive servo amplifier parameters such as equivalent gains of PWM driver and velocity gains of servo system were estimated from frequency response tests. The complete dynamic model for overall robot system was used in the simulation of the open-loop control. The simulation results agreed reasonably well to the experimental results. The feedforward control using the dynamic models improved the trajectory tracking performance, decreasing the tracking error by factor of three compared with PID control. This study found that the inverse dynamic model of the robot arm including the drive servo system showed better performances than the case of arm dynamic model only.
조주현,전학훈,강봉수,김승기,Ju Hyun Cho,Hak Hoon Jun,Bong Su Kang,Seung Ki Kim 대한갑상선-내분비외과학회 2014 The Koreran journal of Endocrine Surgery Vol.14 No.4
Purpose: Thyroglossal duct cyst (TGDC) is known to be the most common midline neck mass in children, but the adult population still has this abnormality. The most common symptom of TGDC is a simple neck mass, and differential diagnosis among other abnormalities is important. The aim of this study is to perform a retrospective view of TGDC in order to describe any differences in clinical features, diagnostic tools, treatment, and outcomes in children and adults who underwent surgery in a single institution, and to determine its clinical implications. Methods: We performed a retrospective chart review on 75 pathologically diagnosed TGDC patients from 1995 to 2013 who were divided into two groups: children (≤18 years) and adults. Comparison analysis was performed for age, sex, site and location of cyst, size, diagnostic tool, surgical method, and postoperative outcome. Results: Our study showed frequent occurrence of TGDC in adults. There was no significant sex, site, or location difference in the occurrence of TGDC in children and adults, however, the size of cyst in adults was larger than that in children (mean, 2.80 cm vs 2.15 cm) (P< 0.001). Four patients (5.3%) had postoperative recurrence of TGDC, and Sistrunk operation showed lower recurrence rate than excision (3.1% vs 18.2%) (P<0.040). Two malignancy cases were identified postoperatively in adults. Conclusion: Particularly in adults, the possibility of carcinoma would make it important to perform fine-needle aspiration for differential diagnosis. Sistrunk procedure will remain the treatment of choice for most TGDC patients considering recurrence risk.