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MANET에서 악의적인 노드의 안전하고 효율적인 검출 방안
이강석,최종오,지종복,송주석,Lee KangSeok,Choi JongOh,Ji JongBok,Song JooSeok 한국정보처리학회 2005 정보처리학회논문지 C : 정보통신,정보보안 Vol.12 No.5
최근 MANET에서의 연구는 보안을 고려한 라우팅 서비스에 주목되어 왔으나 기존에 제시되었던 MANET에서의 악의적인 노드를 식별하는 방안들은 거짓 신고하는 악의적인 노드가 있을 때에는 이를 적절히 식별하고 제거하지 못하는 문제점이 있었다. 따라서 본 논문에서는 신고자와 혐의자 목록으로 구성되는 신고 메시지와 신고 테이블을 이용하여 경로 설정단계에서는 정상적으로 동작하지만 데이터 전달 과정에서는 데이터를 버리거나 내용을 변경시키는 행위, 또는 다른 노드를 거짓으로 신고하는 등의 악의적인 노드를 식별하는 효율적인 방안을 제안한다. 제안하는 방안은 DSR 과 AODV에 모두 적용 가능하다. 또한 성능분석을 위해 AODV와 제안된 알고리즘과 비교 분석하여 제안된 알고리즘이 평균 분실률 및 전송량 측면에서 현격한 성능차이를 있음을 보였다. Lately, the MANET research has focused on providing routing services with security and previous schemes have been proposed for detecting malicious nodes in a MANET. However, they still include some problems which malicious nodes cannot be found when they falsely report other nodes as malicious. Accordingly, we propose a novel and efficient scheme for detecting malicious nodes using report messages and a report table which is consisted of node ID both for suspecting and reporting when the malicious nodes behave normally during the route discovery, but the other hand they drop and modify packets, or falsely report other nodes as malicious during the data transmission. Our proposed scheme is applicable to not only DSR but aiso AODV. And we provide some simulation results of our proposed scheme by comparing general AODV with our proposed scheme. Simulation results show that our Proposed scheme outperforms general AODV in terms of average packet loss ratio and packet delivery ratio.
개발 프로세스 모델에 따른 전동식 안전벨트 제어 시스템 개발
이강석(Kangseok Lee),이우택(Wootaik Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper describes the development of a control system for a motorized seat belt. The traditional seat belt can protect passengers only after accidents as a passive safety system. The developed motorized seat belt could cover some weak points of the passive safety system. As a seat belt is developed to an active safety system, the software gets more importance than traditional system. Therefore, tests such as functional, unit and system test are necessary to develop the motorized seat belt control system. In this paper, we defined operations of a motorized seat belt and make its functional model. Operations of motorized seat belt are confirmed by simulations of a functional model. We confirmed the implemented code by software unit tests. Finally, the integrated motorized seat belt system is confirmed by system test. The motorized seat belt system is guaranteed its reliability by these tests.
국가공역체계 내에서 군용 무인항공기 비행규칙에 관한 제언
박원태,이강석,임광현,Park, Wontae,Lee, Kangseok,Im, Kwanghyun 한국항공운항학회 2014 한국항공운항학회지 Vol.22 No.1
Military UAV(Unmanned Aerial Vehicle) operated as a RC(Remotely Control) model level within the limit of the military special use airspace until now. However, the high and medium altitude of URA(Unmanned Reconnaissance Aircraft) which the ROKAF have been trying to import recently is at the UAV level and needs the criteria for the classified airspace flights. The required flight criteria includes operator location, mission operation limit, equipment, etc., which are the principle and standard applied based on the airspace use for UAV. Also, the general flight rules, visual flight rules, instrument flight rules are required in order to have to be applied to the actual flight. Besides, an appliance regulation needs to be arranged regarding two-way communication, ATC and communication issue, airspace and area in-flight between UAS( Unmanned Aircraft System) users. An operation of the UAV in the air significantly requires the guarantee of the aircraft's capacity, and also the standardized flight criteria. A safe and smooth use is ensured only if this criteria is applied and understood by the entire airspace users. For the purpose, a standardized military UAV flight operations criteria that is to be applied for each airspace by UAV is to be prepared through analysis of the present state, a legend UAV system, and a special character analysis.
BLDC 고속 센서리스 구동의 ZCP 추정 오차 저감을 위한 Programmable Low Pass Filter 설계
서은정(Eunjeong Seo),이강석(Kangseok Lee),이우택(Wootaik Lee) 대한전기학회 2014 전기학회논문지 Vol.63 No.1
This paper presents a design method of programmable low pass filter(PLPF) which reduce an estimation error of a zero crossing point(ZCP) for a high speed brushless DC(BLDC) motor drive. BLDC motor sensorless drive is possible by estimation of ZCP. The ZCP estimated by detecting a change of back-EMF polarity has the estimation error because noises exist on the measured back-EMF. Therefore a calculated commutation timing using the ZCP is inaccurate. And the inexact commutation timing leads to ripples of 3-phase current and degradation of drive performance. This paper proposes the design method of the PLPF to overcome these problems. First, a speed calculated a inaccurate period of the ZCP is analyzed in the frequency domain. Then, the PLPF that has varying cut-off frequency according to change of the speed is designed on the frequency analysis result. The proposed method is verified by the experiment.
허지훈,서소진,이보은,염지현,이강석,Heo, Jihune,Seo, Sojin,Lee, Boeun,Yeom, Ji-Hyun,Lee, Kangseok The Microbiological Society of Korea 2016 미생물학회지 Vol.52 No.3
RNase E (Rne) is an essential enzyme involved in the processing and degradation of a large portion of RNAs in Escherichia coli. The enzymatic activity of RNase E is controlled by regulators of ribonuclease activity, namely, RraA and RraB. Gram-positive bacterium Streptomyces coelicolor also contains homologs of Rne and RraA, designated as RNase ES (Rns), RraAS1, and RraAS2. In the present study, we investigated the effect of S. coelicolor RraAS1 on the ribonucleolytic activity of RNase E in E. coli. Coexpression of RraAS1 with Rne resulted in the decreased levels of rpsO, ftsZ, and rnhB mRNAs, which are RNase E substrates, and augmented the toxic effect of Rne overexpression on cell growth. These in vivo effects appeared to be induced by the binding of RraAS1 to Rne, as indicated by the results of co-immunoprecipitation analysis. These results suggested that RraAS1 induces ribonucleolytic activity of RNase E in E. coli. RNase E는 대장균(Escherichia coli)에서 수많은 RNA의 가공 및 분해에 관여하는 필수적인 효소이다. RNase E의 효소 활성은 RraA와 RraB에 의해 조절된다. 그람양성균인 Streptomyces coelicolor는 RNase ES, RraAS1, RraAS2라고 명명되는 RNase E와 RraA의 동족체를 가지고 있다. 이 연구에서는 S. coelicolor 유래의 RraAS1이 E. coli에서 RNase E의 효소활성을 저해하는지 연구하였다. 대장균에서 RraAS1의 발현은 RNase E의 과발현에 의해 감소된 세포생장을 더욱 저하시켰으며, RNase E의 기질인 rpsO, ftsZ, rnhB mRNA의 양을 감소시키는 것을 확인 하였다. 이러한 RraAS1의 효과는 공동면역침전실험을 수행한 결과에서 유추할 수 있듯이, Rne 단백질과 RraAS1의 결합으로 유도되는 것으로 보인다. 이러한 결과는 RraAS1이 대장균에서 RNase E의 리보핵산 가수분해 활성을 유도함을 시사한다.