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서우덕(Woo-Duk Seo),이성신 (Sung-Sin Lee),신원용 (Won-Yong Shin),최상일(Sang-Il Choi) 한국컴퓨터정보학회 2018 韓國컴퓨터情報學會論文誌 Vol.23 No.2
In this paper, we propose a gait type classification method based on pressure sensor which reflects various terrain and velocity variations. In order to obtain stable gait classification performance, we divide the whole gait data into several steps by detecting the swing phase, and normalize each step. Then, we extract robust features for both topographic variation and speed variation by using the Null-LDA(Null-Space Linear Discriminant Analysis) method. The experimental results show that the proposed method gives a good performance of gait type classification even though there is a change in the gait velocity and the terrain.
스마트 깔창을 이용한 보행 형태 분류를 위한 데이터 전처리 기법에 대한 연구
서우덕 ( Woo-duk Seo ),이성신 ( Sung-sin Lee ),최상일 ( Sang-il Choi ) 한국정보처리학회 2017 한국정보처리학회 학술대회논문집 Vol.24 No.2
본 연구에서는 스마트 깔창을 사용한 보행 분석을 위한 데이터 전처리 기법을 제안한다. 이를 위해 본 논문에서는 평지 보행, 오르막 보행, 내리막 보행, 계단 오르기, 계단 내려가기, 달리기, 빠른 보행의 7가지 종류의 보행 데이터를 수집하였다. 수집한 데이터에 대해 제안한 데이터 전처리 기법을 적용한 결과를 실제 걸음 수와 비교하였다. 실험결과 전처리한 결과가 실제 걸음 수에 가까운 결과를 보임을 확인하였다.
ARP Spoofing과 Hijacking 연동공격에 대한 탐지 및 추적
박현민,서우일 명지대학교 산업기술연구소 2001 産業技術硏究所論文集 Vol.20 No.-
This paper reviews Hijacking which is a simple active attack. The Hijacking based on the unguarded characteristics of TCP Protocol makes a TCP stream of an end-to-end connection between two hosts pass through an attacker 's host. In order to avoid TCP ACK Strom that is the side-effect of Hijacking, ARP Spoofing is used along with the Hijacking. We study a detecting solution to the Hijacking attacks with or without ARP Spoofing.This paper shows not only how to detect these attacks, but also how to trace out the attacker for a more aggressive defense.
정명교,이상민,서우선,이현성,정수룡,조길현,이영민,김대경,김두일,김동수 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.3
Atrial septal defect (ASD) is the most common congenital cardiac anomaly, accounting for 30 percent of congenital heart disease detected in the adult. Many patients with ASD are well tolerated and reach adult without significant symptoms. Reports of familial ASD are rare. Recently we experienced two cases of ASD, which one is a 20-year-old man who is younger brother and the other is a 21-year-old man who is older brother, so we report them with a review of the literature.
18세 원발성 고혈압 환자에서 발생한 비Q파 심근 경색 1례
배경임,이재호,서우선,허민영,정수룡,조길현,이영민,김대경,김두일,김동수 인제대학교 백병원 2002 仁濟醫學 Vol.23 No.3
Myocardial infarction in persons under the age of 45 years accounts for 6% to 10% of all myocardial infarction in the United states. In this age group, it is predominantly a disease of men. Important risk factors include a family history of myocardial infarction before age 55 years, hyperlipidemia, smoking, and obesity. Unlike older patients, approximately half of young patients have single-vessel coronary disease, and in up to 20%. The cause is not related to atherosclerosis. Coronary angiography may be warrannnnted in young patients with myocardial infarction to define the anatomy of the disease and to permit optimal management. We report case that was diagnosed non Q myocardial infarction with history of hypertension in the young women.
간 및 경부 림프절 생검으로 진단된 혼합 간세포-담관상피암종
강혜원,박재정,문일환,김서우,김현경,오현정,김고흔,최윤정,허현미,노영욱,김태헌,유 권,배지윤,송동은 이화여자대학교 의과대학 2009 EMJ (Ewha medical journal) Vol.32 No.2
Mixed hepatocellular-cholangiocarcinoma accounts for about 1% of all hepatocellular carcinoma. In many cases, mixed hepatocellular-cholangiocarcinoma has been misdiagnosed as hepatocellular carcinoma or cholangiocarcinoma because of the indistinctive clinical course and radiologic findings. The clinical course and the pathologic characters are not known well, but it resembles the characteristics of hepatocellularcarcinoma rather than cholangiocarcinoma. So mixed hepatocellular-cholangiocarcinoma was classified as a kind of hepatocellular carcinoma. But the growth and dissemination rate is faster than that of hepatocellular carcinoma and the prognosis more poor. So the exact diagnosis is important. Authors experienced a patient who has the mixed hepatocellular-cholangiocarcinoma diagnosed by liver and neck node biopsy in patient who complain-ed abdominal discomfort and palpable mass, so we report the case.