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자유로운 문자열의 키스트로크 다이나믹스와 일범주 분류기를 활용한 사용자 인증
서동민,강필성 대한산업공학회 2016 대한산업공학회지 Vol.42 No.4
User authentication is an important issue on computer network systems. Most of the current computer network systems use the ID-password string match as the primary user authentication method. However, in passwordbased authentication, whoever acquires the password of a valid user can access the system without any restrictions. In this paper, we present a keystroke dynamics-based user authentication to resolve limitations of the password-based authentication. Since most previous studies employed a fixed-length text as an input data, we aims at enhancing the authentication performance by combining four different variable creation methods from a variable-length free text as an input data. As authentication algorithms, four one-class classifiers are employed. We verify the proposed approach through an experiment based on actual keystroke data collected from 100 participants who provided more than 17,000 keystrokes for both Korean and English. The experimental results show that our proposed method significantly improve the authentication performance compared to the existing approaches.
비만 환자에 대한 조위승청탕의 효과 및 부작용에 관한 임상적 고찰
서동민,이상훈,이재동,Seo, Dong-min,Lee, Sang-hoon,Lee, Jae-dong 대한침구의학회 2005 대한침구의학회지 Vol.22 No.3
Objective : This study was designed to investigate the effects and adverse effects of Choweseuncheng-tang on obesity patients Methods : Choweseuncheng-tang was given to 20 obesity patients who have no abnormality of GOT, GPT and past medical history. Additionally, electroacupuncture was performed on Fuchao(腑巢) with 60Hz. We compared body weight, body fat and laboratoy test(GOT, GPT, BUN, Creatinine) between before and after treatment. Blood pressure, heart rate and clinical symptoms were checked to investigate the side effects. Decrease of body weight was checked in accordance with Sasang constitutional type, appetite type, and BMI. Results : 6 patients(BMI 23-24.9), 10 patiets(BMI 25-29.9), and 4 patients(BMI over 30) were showed decrease of body weight. We found body fat was decerased $3.16{\pm}1.25%$. BUN, Creatinine, GOT and GPT were increased within normal range. There were adverse event of autonomic hyperactivity(11 patients), gastrointestinal symptoms(7 patients) and others(3 patients). Conclusions : According to above results, Choweseuncheng-tang could be used effectively, but should be taken cautiously on obese patients.
서동민,김용수,김현수 한국산업경영시스템학회 2011 한국산업경영시스템학회 학술대회 Vol.2011 No.-
To prevent global warming, a variety of governments are investing in electric vehicle research and especially in Korea, electric vehicle is trying to be applicable to public transportation. Lithium batteries used in electric vehicles such as mobile phone and laptops are mainly used and life cycle is expected to 1-2 year. If electric vehicles are used popularly, many discarded batteries will occur and it is harmful to the environment. In addition, lithium batteries are explosive in nature and should be treated cautiously. Therefore, reverse logistics is needed to handle the batteries efficiently and safely. Reverse logistics includes the collection, remanufacturing, recycling and discarding of the waste. In this study, reverse logistics process for electric vehicle batteries is developed through the analysis of the AS-IS process of the lead and lithium batteries. In addition, disposal regulations for electric vehicle batteries are proposed based on the current law of the waste of the conventional batteries.