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A Study on the Malicious Process Detection System Model based on Security Agent
Seong-Muk Choi,Yeol-Joo Ryou,Hoo-Ki Lee,Hee-Hoon Cho,Jong-Bae Kim 한국정보통신학회 2015 2016 INTERNATIONAL CONFERENCE Vol.7 No.1
As recently use of Internet gets increased rapidly, infection path through the network becomes diverse. In particular, attacks by Bot mainly work at C&C (command-andcontrol) server but it can be secured just by blocking IP because C&C server runs in form of IP. However, these attackers too get gradually intelligent as they try to connect periphrastically in order to avoid server blocking. Once these malicious codes infiltrate user’s system, it is not easy to detect it through general detection method while it is running. In this paper, so, we propose malicious process detection system based on security agent in order to prevent damage caused by malicious code infection from being spread.
Byeng-Joo Byen,Jung-Muk Choe,Gyu-Ha Choe 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.4
This study proposes high-performance voltage controller design that employs a capacitor current control model for single-phase stand-alone inverters. The single-phase stand-alone inverter is analyzed via modeling, which is then used to design the controller. A design methodology is proposed to maximize the bandwidth of the feedback controller. Subsequently, to compensate for the problems caused by the bandwidth limitations of the controller, an error transfer function that includes the feedback controller is derived, and the stability of the repetitive control scheme is evaluated using the error transfer function. The digital repetitive controller is then implemented. The simulation and experimental results show that the performance of the proposed controller is high in a 1.5 kW singlephase stand-alone inverter prototype.
Parallel PCS Interconnection Current Surge Elimination Technique Using a Coupled Inductor
Jung-Muk Choe,Byeng-Joo Byen,Gyu-Ha Choe 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.5
This study proposes a coupled inductor method for the parallel operation of a power conditioning system (PCS). When primary and secondary currents flow in the same direction in a coupled inductor, total flux and inductance are cancelled; when currents flow in opposite directions, each flux becomes an individual inductor. These characteristics are applied in the parallel operation of a PCS. To connect at a grid code, abnormal current, which is barred under the grid connection code, is blocked by using a coupled inductor. A design based on the capacity and current duration time of a PCS is verified through hardware implementation. Experiment results show the effectiveness of variance reduction.
A Capacitor Current Control for Stand-alone Inverters Using an Inductor Current Observer
Jung-Muk Choe,Byeng-Joo Byen,Seungryul Moon,Jih-Sheng Lai 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper discussed an inductor current observer design that employs a capacitor current control model for single-phase stand-alone inverters. The singlephase stand-alone inverter is analyzed via modeling. The proposed solution is able to guarantee a fast dynamic response and also a precise compensation of a distortion load. Moreover, with a proper design of observer parameters, it is possible to build a precise inductor current information without the inductor current sensor. The simulation and experimental results show that the performance of the proposed controller.
Malicious Processor Detection based on the Security Agent
Seong-Muk Choi,Yeol-Joo Ryou,Hoo-Ki Lee,Hee-Hoon Cho,Jong-Bae Kim 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.11
Recently, as Internet is widely used due to the increased spread of the internet network, the software with malicious intent is distributed via the internet and its infection path gets various too. In particular, attacks by Bot mainly work at C&C (command-and-control) server but it can be secured just by blocking IP because C&C server runs in form of IP. However, this attacker too gets gradually intelligent as they try to connect periphrastically in order to avoid server blocking. Once these malicious codes infiltrate user’s system, it is not easy to detect it through general detection method while it is running. In this paper, we propose malicious process detection system based on security agent in order to prevent damage caused by malicious code infection from spreading.
Load Disturbance Compensation for Stand-alone Inverters Using an Inductor Current Observer
Jung-Muk Choe,Seungryul Moon,Byeng-Joo Byen,Jih-Sheng Lai,Young-Bae Lim,Gyu-Ha Choe 전력전자학회 2017 JOURNAL OF POWER ELECTRONICS Vol.17 No.2
A control scheme for stand-alone inverters that utilizes an inductor current observer (ICO) is proposed. The proposed method measures disturbance load currents using a current sensor and it estimates the inductor current using the ICO. The filter parameter mismatch effect is analyzed to confirm the ICO’s controllability. The ICO and controllers are designed in a continuous-time domain and transferred to a discrete-time domain with a digital delay. Experimental results demonstrate the effectiveness of the ICO using a 5-kVA single-phase stand-alone inverter prototype. The experimental results demonstrate that the observed current matches the actual current and that the proposed method can archive a less than 2.4% total harmonic distortion (THD) sinusoidal output waveform under nonlinear load conditions.
Track 3 : 컴퓨터활용교육; 아두이노 기반 실험 교육이 갖는 피지컬 컴퓨팅의 효과
오주형 ( Joo Hyeong Oh ),김민수 ( Min Soo Kim ),최인준 ( In Joon Choi ),장명호 ( Myung Ho Jang ),김희주 ( Hee Ju Kim ),유태묵 ( Tae Muk Lyoo ),김동정 ( Dong Jeong Kim ),유헌창 ( Heon Chang Yu ) 한국컴퓨터교육학회 2014 한국컴퓨터교육학회 학술발표대회논문집 Vol.18 No.1
OECD 주요 국가에서는 과학교육을 위하여 오래 전부터 마이크로컴퓨터 기반 실험교육을 실시해 왔다. 우리나라에서도 2005년부터 현재에 이르기까지 이를 시행해 왔는데, 일부 과학고등학교에서만 실시되고 있다. 일반 고등학교에서 실시되지 못하는 이유는, 마이크로컴퓨터 기반 실험교육이 갖는 비용이 크고, 일반 고등학교에서 교육 장비를 구비하기 어려운데다가 관련 전문지식을 갖춘 교육자들이 부족하기 때문이다. 본 연구에서는 아두이노(Arduino)를 이용하여 일선 학교에서 쉽게 접근할 수 있도록 했다. 아두이노와 연결되어 사용하는 센서들도 교육 목표에 도달하기에 부족함이 없었다. 학습자들이 직접 아두이노와 센서를 결합하여 회로를 구성할 수 있었으며, 아두이노를 제어할 수 있는 C언어 기반의 PROCESSING 프로그래밍 도구를 이용하여 결과를 얻을 수 있는 프로그래밍을 하였고, 그 결과를 그래프로 가공하여 보았다. 교사의 도움 없이도 쉽게 접근하여 문제를 처리할 수 있었다. 이와 같은 아두이노 기반의 피지컬 컴퓨팅의 효과를 알아보기 위하여, 본 연구는 아두이노를 이용하여 구성된 온도 및 빛의 양을 측정하는 모듈에 대한 성능을 평가할 수 있는 실험을 함으로써, 피지컬 컴퓨팅이 갖는 효과를 알아보았다.
( Sang Muk Oh ),( Chang Gyo Park ),( Joo Hee Kang ),( Eun Jung Kim ),( Hee Youn Chee ),( Bong Ho Lee ),( Kyung Bok Lee ) 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.3
Dieckol, a polyphenol compound extracted from Brown algae, Ecklonia cava, is known to have anti-inflammatory and anti-tumorigenic activities. However, the underlying molecular mechanism by which dieckol regulates cancer cell growth and proliferation remains elusive. Here we report that dieckol extracted from Ecklonia cava inhibited 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced human hepatocellular carcinoma SK-Hep1 cell motility, and that dieckol decreased extracellular signal-regulated kinases 1/2 and c-Jun N-terminal kinases (JNKs) activities, but not p38 Mitogen-Activated Protein Kinase (MAPK), in dose-dependent manner. Dieckol reduced TPA-induced activator protein-1 transcriptional activity. TPA-induced matrix metalloproteinase-9 (MMP-9) activity was greatly reduced in SK-Hep1 cells by treatment of dieckol. These findings suggest that dieckol functions as a potent inhibitor for tumor promoter-mediated MAPK signaling pathways leading to AP-1 and MMP-9 activation thereby regulates cancer cell motility.