• The Korean Journal of Applied Statistics
• /
• v.34 no.1
• /
• pp.25-38
• /
• 2021

Recently the need for network surveillance to detect abnormal behavior within dynamic social networks has increased. We consider a dynamic version of the degree corrected stochastic block model (DCSBM) to simulate dynamic social networks and to monitor for a significant structural change in these networks. To apply a control charting procedure to network surveillance, in-control model parameters must be estimated from the Phase I data, that is from historical data. In network surveillance, however, there are many situations where sufficient relevant historical data are unavailable. In this paper we propose a self-starting Shewhart control charting procedure for detecting change in the dynamic networks. This procedure can be a very useful option when we have only a few initial samples for parameter estimation. Simulation results show that the proposed procedure has good in-control performance even when the number of initial samples is very small.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2014.05a
• /
• pp.402-403
• /
• 2014

Micro-magnetic detection system is used to detect small particles in an automatic transmission valve body, which signal noise and time-delay may occurs in process of signal transmitting and filtering. In this paper, we present the design and implement of a micro-magnetic detection system based on wireless sensor networks. Micro-magnetic detection system consists of five modules which are magnetic sensor detector, signal processing unit, wireless sensor networks, system control unit and system monitoring unit. The experimental results show that signal noise and time-delay decreased.

• Proceedings of the KIEE Conference
• /
• 2004.11c
• /
• pp.66-68
• /
• 2004

PID제어기를 플랜트 파라미터를 이용하여 구성하는 IMC-PID제어에 대해 연구한다. 특히 변하는 플랜트에 대해서는 자기동조(ST, Self-Tuning)를 사용하여 시스템을 식별하여 활용한다. 특히 실시간으로 개루프의 위상여유 및 이득여유를 모니터링하여 정해진 구역을 벗어나게 되면 식별된 시스템파라미터를 이용하여 IMC-PID제어기를 구성한다. 또 시간영역 지표로 과도한 오차가 발생하는 경우에도 제어기를 갱신함으로서 전체적으로 보면 견실 PID제어기 형태를 갖게 한다.

• 한국정보교육학회:학술대회논문집
• /
• 2008.01a
• /
• pp.181-186
• /
• 2008

휴대폰이나 PDA와 같은 모바일 기기의 확산과 더불어 모바일 통신 환경을 기반으로 하는 모바일 교육 학습 모델이 교육의 질향상 및 교육 효과의 극대화를 꾀할 것으로 기대되는 실정이다. 또한 모바일 환경에서 학습자가 지속적이고 자기 주도적으로 학습을 하기 위해서 자기조절학전략이 필요하며, 이를 위해 모바일 학습환경에 적합한 MMIS(Motivation Metacognitive practice Interaction. Self-reflection: 자기 주도학습전략)모형을 설계하도록 하였다. 특히 학습자의 지속적인 흥미와 동기부여를 위해 에튜테인먼트(edutainment)전략을 활용하여 모바일 게임에 익숙한 학습자의 특성에 맞는 모형으로 설계하였다. 본 논문에서 설계한 MMIS 모형의 특징은 다음과 같다. 첫째, 학습자가 스스로 학습 전략을 계획하고 통제할 수 있도록 게임의 난이도를 스스로 결정할 수 있다. 둘째, 학습자가 게임활동을 스스로 계획하고, 게임 결과를 모니터링 할 수 있다. 셋째, 사전에 게임에 필요한 학습 내용을 제공받음으로써 게임에서 좋은 결과를 얻기 위한 노력을 할 수 있도록 하였다. 넷째, 게임을 할 때 해결하기 어려운 과제의 경우에는 교사나 게임에서 제공되는 힌트를 통해 스스로 필요한 도움을 찾아낼 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.435-438
• /
• 2012

Today, In all fields, As combination of ubiquitous computing-based technologies between electronic space and physical space, has been active trend research about wireless integration sensor network between sensors and wireless technology. Also, but in ship is underway research about Ship Area Network(SAN) of intelligent ship to integrate wireless technology, ship is required SAN-bridge technology of a variety of wired, wireless network integration and heterogeneous sensor and interoperability of the controller and SAN configuration management technology of remote control. Ship keep safe of all the surrounding environment including crew besides structural safety and freight management monitoring. In this paper, for monitoring design such as on climate change detection and temperature, pressure about various structures, there identify technology trends for routing and data aggregation to use energy efficiency in wireless sensor network. And to analyze self-organizing clustering method, study For wireless sensor network configuration in ship.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2021.10a
• /
• pp.292-294
• /
• 2021

The digital twin-based smart pipe integrated management system is an integrated solution for efficient operation and monitoring that we propose. We buried a waterway pipe underground with self-diagnostic and condition monitoring sensor functions. This pipe sends sensing data and accumulates it. Our system analyzes data to make smart decisions. The main functions of this system are remote control and monitoring. Therefore, "how to configure monitoring in real time" is a big issue. For this purpose, we designed a special real-time-based agent function. In this paper, to solve this problem, a layered architecture was proposed based on transmission points where sensor data are exchanged. An agent was placed in each layer to look at the lower layer and periodically monitor whether there were any changes in the sensor in real time. Finally, the agent system was designed and the conceptual model level was implemented to verify excellence.

• Proceedings of the Korea Multimedia Society Conference
• /
• 2003.11a
• /
• pp.128-131
• /
• 2003

최근 인터넷을 대상으로 한 네트워크 공격의 공격 경향은 분산 환경에서 다수 공격자의 대규모 분산 서비스 거부 공격(DoS)의 출현 및 해외 해커들의 국내 전산망을 우회 루트로 활용한 사례의 증가 등 고도화된 불법 행위가 점차 벙죄의 강력한 수단으로 이용되는 추세에 있다. 본 논문은 기존 네트워크 노드기반의 침입탐지시스템에서 효율성과 사용자 편의성을 보완하기 위하여 자기 복제가 가능한 이동 에이전트를 적용하여 호스트 간 자율적인 이동을 통해 관리자에게 네트워크 모니터링을 제공하고 침입을 탐지하는 침입탐지시스템을 제안하였다.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2005.05a
• /
• pp.359-362
• /
• 2005

Self diagnosis monitoring system is defined as concrete structural carbon and glass hybrid fiber materials, in response to the change in external disturbance and environments, toward structural safety and serviceability as well as the extension of structural service life. In this study, carbon and glass hybrid fiber materials were investigated fundamentally for the applicability of self diagnosis in smart concrete structural system as embedded functions of sensors.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2011.06a
• /
• pp.243-244
• /
• 2011

• The KIPS Transactions:PartA
• /
• v.12A no.6 s.96
• /
• pp.547-556
• /
• 2005

Online collaborative teaming, which has emerged as a new type of education in knowledge-based society, is being discussed actively in the areas of action learning at companies and project-based learning and inquiry-based learning at schools. It regards as an effective method for improving learners practical and highly advanced problem solving abilities, and for stimulating their absorption into learning through pursuing common goals of learning together. Different from individual learning, however, collaborative learning involves complicated processes such as organizing teams, setting common goals, performing tasks and evaluating the outcome of team activities .Thus, it is difficult for a teacher to promote and evaluate the whole process of collaborative learning, and it is necessary to develop systems to support collaborative learning. Therefore, in order to monitor and promote interaction among learners in the process of collaborative learning, the present study developed an extensible collaborative teaming supporting agent (ECOLA) in online learning environments.