• Annual Conference of KIPS
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• 2009.04a
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• pp.1222-1225
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• 2009

본 연구개발은 ZigBee 리더기와 단말기 사이의 통신 프로토콜을 설정, ZigBee 단말기에서 전송하는 데이터를 호스트에서 수집/가공/처리할 수 있는 정보시스템을 설계하고 구축하는 것을 목표로 한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.25 no.6
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• pp.1455-1463
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• 2015

If the industrial control system is infected by malicious worm such as Stuxnet, national disaster could be caused inevitably. Therefore, most of the industrial control system defence is focused on intrusion detection in network to protect against these threats. Conventional method is effective to monitor network traffic and detect anomalous patterns, but normal traffic pattern attacks using MITM technique are difficult to be detected. This study analyzes the PROFINET/DCP protocol and weaknesses with the data collected in real industrial control system. And add the authentication data field to secure the protocol, find out the applicability. Improved protocol may prevent the national disaster and defend against MITM attacks.

• Journal of Korea Multimedia Society
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• v.13 no.8
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• pp.1221-1234
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• 2010

MANET(Mobile Ad-hoc Network)s have been researched primary at routing protocols and at the guarantees of QoS(Quality of Service) for mobile environments. Otherwise the Ubiquitous Sensor Networks (USNs) have some limitations in power energies and in processing of sensing data, as well as their network topologies are frequently changed by fading off and node failures. Thus we should redesign network protocols with concerning to energy efficiency for the USNs above all. In this paper, we focus on the protocol interface for managing for USNs based on the surveys. And then we figure the topology of USNs out and design the network protocol interface to make power saved, with data gathering and processing more efficient using our designed packet structures.

• The KIPS Transactions:PartC
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• v.16C no.4
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• pp.495-504
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• 2009

Wireless sensor networks (WSN) consisting of a largenumber of sensors aims to gather data in a variety of environments and is beingused and applied in many different fields. The sensor nodes composing a sensornetwork operate on battery of limited power and as a result, high energyefficiency and long network lifetime are major goals of research in the WSN. Inthis paper we propose a novel cluster-based local multi-hop routing protocolthat enhances the overall energy efficiency and guarantees reliability in thesystem. The proposed protocol minimizes energy consumption for datatransmission among sensor nodes by forming a multi-hop in the cluster.Moreover, through local cluster head rotation scheme, it efficiently manageswaste of energy caused by frequent formation of clusters which was an issue inthe existing methods. Simulation results show that our scheme enhances energyefficiency and ensure longer network time in the sensor network as comparedwith existing schemes such as LEACH, LEACH-C and PEACH.

• The KIPS Transactions:PartC
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• v.13C no.5 s.108
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• pp.541-548
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• 2006

Sensor network is a network for realizing the ubiquitous computing circumstances, which aggregates data by means of observation or detection deployed at the inaccessible places with the capacities of sensing and communication. To realize this circumstance, data which sensor nodes gathered from sensor networks are delivered to users, in which it is required to encrypt the data for the guarantee of secure communications. Therefore, it is needed to design key management scheme for encoding appropriate to the sensor nodes which feature continual data transfer, limited capacity of computation and storage and battery usage. We propose a key management scheme which is appropriate to sensor networks organizing hierarchical architecture. Because sensor nodes send data to their parent node, we can reduce routing energy. We assume that sensor nodes have different security levels by their levels in hierarchy. Our key management scheme provides different key establishment protocols according to the security levels of the sensor nodes. We reduce the number of sensor nodes which share the same key for encryption so that we reduce the damage by key exposure. Also, we propose key update protocols which take different terms for each level to update established keys efficiently for secure data encoding.

• Proceedings of the KIEE Conference
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• 2008.11a
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• pp.279-281
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• 2008

현재 서부아프리카 지역의 경우, 대부분의 발전원은 수력과 화력에 의존하고 있으며 서부 아프리카경제공동체(ECOWAS) 15개 회원국의 전력수급률은 매우 낮은 수준일 뿐만 아니라 국가별 에너지 불균형 또한 심한 상태이다. 이에 서부 아프리카 전력공동체(WAPP)는 지역 간 에너지 불균형 해소 및 국가 간 전력망 연계를 위한 전력거래센터(ICC)의 구축을 추진하고 있다. 본 논문은 향후 WAPP ICC에서 본격적인 전력거래기능을 수행하기에 앞서 각 지역제어센터(CAC)의 전력 정보 수집, 분석 및 공유를 위한 자료연계 방안에 대해 서술하였으며 센터간의 자료연계를 위한 통신 프로토콜은 IEC 60870-6(ICCP) 프로토콜을 이용하였다.

• Annual Conference of KIPS
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• 2023.05a
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• pp.190-191
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• 2023

IoT(Internet of Things) 기술을 기반으로 한 드론은 사용자의 요청에 따라 데이터 처리, 수집, 송·수신 등에 고도화된 ICT(Information and Communications Technology) 기술을 활용하고 있다. 또한, 드론은 ICT 기술이 발전함에 따라 문화, 소방, 국방 등 다양한 분야에 적용되어 사용자에게 편의를 제공하고 있다. 그러나, 드론에 적용되는 ICT 기술과 드론에 탑재되는 기술들이 고도화됨에 따라 드론 모듈 내 펌웨어 및 무선 네트워크를 대상으로 한 보안위협이 증가하고 있다. 따라서 본 논문은 드론의 보안위협에 대응하기 위하여 드론 임베디드 시스템 및 네트워크 프로토콜을 대상으로한 최신 보안위협 동향을 분석한다.

• Annual Conference of KIPS
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• 2007.11a
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• pp.1077-1080
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• 2007

센서 네트워크는 어떠한 현상을 인식하고 측정하여 수집된 데이터를 싱크(sink)노드에 전송하는 역할을 한다. 이러한 센서네트워크에서 고려해야 하는 중요한 사항 중 하나는 제한된 자원을 가진 센서 네트워크에서 주어진 에너지 소모를 최소화 하여 네트워크 수명을 연장하는 것이다. 그러나 기존에 제안된 프로토콜은 다중 모바일 싱크가 존재할 경우에 싱크 노드의 잦은 위치 업데이트와 다수의 컨트롤 패킷으로 인하여 많은 베터리 소모를 야기 하게 되었다. 그러므로 본 논문에서는 그리드와 클러스터 개념을 이용하여 다수의 모바일 싱크 존재 시 발생하는 문제점을 해결하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.6
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• pp.123-128
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• 2015

Recently, a communication protocol for connectivity between various sensors and actuators is issue the key technology in IoT(Internet of Things). IETF(Internet Engineering Task Force) CoAP(Constrained Application Protocol) protocol supports the communication between things like sensors and actuator nodes in a limited environment. Smart-phone will work for the data processing of the sensors and the management of IoT nodes at the next generation communication environment. In this paper, we design the connection for smart-phone and IoT node based using IETF CoAP protocol, and implement the middleware with the proposed data refinement on smart-phone. The middleware detects and eliminates a error data and duplicated data using the proposed data refinement. The proposed data refinement scheme supports to transfer a reliability information in the constrained environment.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.5
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• pp.948-955
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• 2008

Recently, as the dissemination of the Internet and development of computer network technology, Research is actively underway for realization of the next-generation computing paradigm called Ubiquitous Computing. For realization of Ubiquitous computing, The data recognized from each sensors must be collected on real-time and transferred to applied service so that they may be used as data for providing service to users. However, there are several problem for realization. First, there is no standardization of sensor metadata, interface and event definition. Second, applied service has weak point that difficult of approaching to the data. Third, none interoperability with each platform and protocol. In this paper, we designed Sensor Service Description Language based on XML to resolve problem above. This Language expresses the measurement of the sensor and Service Metadata in the form to be standardized. In addition, we have proposed and development a reference model for USN application service.