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IEEE 802.11 MAC 프로토콜에서 전력제어관리의 프로토콜 취약점분석
이병문(ByungMun Lee),최진탁(JinTak Choi) 한국정보기술학회 2006 한국정보기술학회논문지 Vol.4 No.1
IEEE 802.11 wireless network is different from wired network with regard to transmission media, mobility, MAC protocol vulnerability, limited power on a battery, and so on. In order to take full advantage of mobility, the location of a station shouldn't be a constraint, including the availability of electrical power. But battery power is a limited resource. So 802.11 MAC have some power management protocols to minimize spending the power. AP can buffer frames to the station which is in sleep mode because all traffic for mobile stations must go through AP. But attacker send contaminated frames which are spoofing MAC address, association ID, BSSID to AP. AP send buffered frames to attacker. Thus attacker could intercept the frames. This paper present the interception technique of buffered frames on vulnerable 802.11 MAC protocol for power control. And we also constitute a test environment and check interaction between AP and the station to find out why it is vulnerable.
무선생체 센서노드의 에너지효율화를 위한 전송 프로토콜에 대한 연구
이병문(Byungmun Lee),박연희(Yunhui Park),최창훈(Changhoon Choi) 한국정보기술학회 2010 한국정보기술학회논문지 Vol.8 No.4
The convergency of medical sensor device and wireless sensor network is under way in order to improve personal health device for comfortable mobility of user or patient. The bridge transmission method between wireless personal health devices based on ad-hoc network has energy consumption problem caused by redundant packets. To solve the problem, we introduced transmission protocol for energy-efficiency as considering types of medical sensors, topology of u-Health network, and power of sensors. We also implemented an application on sensor nodes like a personal health device, and then we knew that transmission protocol is working well by checking out the payload data in each packet. The energy efficiency is a highly significant issue in a wireless sensor network, as well as transmission issue. We also need to consider energy efficiency in a application depending on type of sensor.
모바일 네트워크에서 VoIP 서비스를 위한 모바일 IP 이동성에 관한 연구
이병문(Byungmun Lee),이영호(Youngho Lee) 한국정보기술학회 2003 한국정보기술학회논문지 Vol.1 No.2
The Internet users want IP service such as VolP, over mobile networks environment because of the variety of terminals like PDA, notebook, Cellular phone, PCS and so on. But Mobility over mobile network is difficult to adapt for IP networks. Therefore we propose Mobile IP processing model in this paper which is available solution for the integration IP service and Mobile Network environment, and also introduce regional registration mechanism which is to register the CoA address of the mobile node. For better effective regional registration, We present the Authentication, Authorization, and Accounting Service for the mobile node.
지그비 기반의 심전도 센서노드를 사용한 적응형 심박탐지 모델
이병문 ( Byungmun Lee ),박연희 ( Yeonhee Park ),이영호 ( Youngho Lee ) 한국인터넷정보학회 2009 인터넷정보학회논문지 Vol.10 No.3
u-헬스케어 시대가 도래 하면서, 심장질환자의 생체신호 모니터링 형태가 바뀌고 있다. 현재의 심장 질환자의 생체신호모니터링은 각종 심전도 측정기기에 달린 케이블 때문에 상당한 불편을 감수해야 했다. 그러나 최근 들어 무선 센서 네트워크를 이용하면 케이블로 인한 불편이 감소되고 이동이 자유로울 수 있기 때문에 심전도 데이터를 무선으로 전송하는 기술이 활발히 연구되고 있다. 물론 무선 데이터전송량을 줄이기 위한 방법으로 심전도 데이터에서 심박을 측정한 데이터를 추출하여 보내는데 이것은 개인마다 심전도 신호 세기가 달라서 오차가 생긴다. 본 논문에서는 서로 다른 심전도 세기에 맞추어 심전도를 보정하여 측정할 수 있는 적응형 심박 탐지 모델을 제안한다. 또 제안된 모델을 검증하기 위해, TinyOS2.0 환경에서 센서 어플리케이션을 설계하고 구현하여 실험을 실시하였다. 실험과정에서 획득한 데이터를 분석함으로써 적응형 심박 탐지모델의 유용성을 평가하였다. With the upcoming u-healthcare era, a way of measurement for vital sign monitoring of cardiac patients is changing as well. In existing measurement of cardiac patients, various wire in ECG measuring equipment has caused much discomfort and inconvenience. In order to decrease the problem, we are developing an efficient measurement of ECG signal using Wireless sensor network. In this paper, we present a way to reduce amount of data by transmitting ECG data collected from radioelectrocardiogram sensor based on Zigbee after calculating cardiac rate. And in order to control the error which can be caused by the different ECG signal intensity each individual can has, we also suggest an adaptive pulse measurement model which can measure heart rate with correcting according to different ECG intensity. To verify the suggested model, sensor application was developed and the data was acquired in TinyOS 2.0 environment and the adaptive pulse measurement model was evaluated through the data from the experiments.
이영호(YoungHo Lee),이병문(ByungMun Lee) 한국정보기술학회 2003 한국정보기술학회논문지 Vol.1 No.2
Today’s corporations need constant technology innovations in order to survive in dramatica1 environment changes and use Information Technology as a core tool that leads these innovations aggressively. However it still stays as a difficult problem to adapt Information Technology to essential decision making process other than basic work process. Therefore in this thesis, we present the next generation eBI model development method and architecture which can solve the limited functions and the problems that existing DW has in essential decision making process.
향상된 FFP(Feature Frequency Profile)을 활용한 악성 댓글의 판별시스템
김현정(HyunJung Kim),윤영미(YoungMi Yoon),이병문(ByungMun Lee) 한국정보기술학회 2011 한국정보기술학회논문지 Vol.9 No.1
Putting postings on other people's articles gives good means of communication. However, it is growing to use them in order to intrude privacy, make a personal attack or defamation behind a veil of anonymity. We propose a prediction system for abusive postings. FFP(Feature Frequency Profile) method is used for extracting features which exhibit frequently in the abusive posting. However FFP method has lack of interpreting different features of which meaning are same into same features since language use on internet often does not follow its formal rules. Our algorithm uses Unicode in order to handle linguistically destructed different features of which meanings are same. This method enhances FFP by replacing frequently exhibited words with initial consonants only for feature selection, and uses SVM and Random Forest for classification. This Enhanced FFP method achieves high accuracy up to 15.4% increase as against other comparison methods.
인지건강증진 프로그램이 노인의 인지기능, 우울 및 삶의 질에 미치는 효과
김혜순(Hye-Soon Kim),이여진(Yeo-Jin Yi),박광희(Kwang-Hi Park),강운구(Un-Ku Kang),이병문(Byungmun Lee) 한국콘텐츠학회 2010 한국콘텐츠학회논문지 Vol.10 No.8
본 연구의 목적은 인지건강증진 프로그램이 노인의 인지기능, 우울, 삶의 질에 미치는 효과를 알아보기 위함이다. 치매를 진단 받지 않은 60세 이상의 1,251명의 정상 노인을 대상으로 하였으며, 실험처치로써 인지학습과 유희프로그램으로 구성된 인지건강증진 프로그램을 12주에 걸쳐 주 2회씩 실시하고 paired t-test를 이용하여 실험처치의 효과를 확인하였다. 연구의 대상자들은 실험처치 후 인지기능(t=-13.903, p<.001), 우울(t=9.544, p<.001) 및 삶의 질(t=-4.613, p<.001) 점수에 차이가 나타났으며 통계적으로 유의하였다. 따라서 인지건강증진 프로그램이 정상노인의 인지기능을 높여주고 우울을 낮추며 삶의 질을 향상시킬 수 있는 유용한 간호중재 프로그램임을 확인할 수 있었다. The purpose of this study was to identify the effects of cognition promoting program on cognitive function, depression, and quality of life in elders. The participants were 1,251 who were above 60 years olds(averaging 76.9 years of age) without dementia. During 12 weeks they participated the cognitive health promoting program twice a week. The program consisted of ReBrain cognitive education and game program. Then the effects of treatment were compared using a paired t-test between pre-test and post-test. Cognitive function(t=-13.903, p<.001), depression(t=9.544, p<.001), and quality of life(t=-4.613, p<.001) in elderly were significantly different after 12-week. These findings indicate that an 12-week cognitive health promoting program could be an effective nursing intervention program to improve cognitive function, to decrease depression, and to promote quality of life in elders.