• Proceedings of the Korea Multimedia Society Conference
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• 2002.05c
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• pp.385-389
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• 2002

Ad-hoc 무선망은 고정된 유선망을 가지지 않고 이동 노드들로만 구성된 망이다. 여러 가지 이동 노드에 대한 이동 제약이 없고, 유선망이나 기지국 같은 기반 구조를 필요를 하지 않기 때문에 여러 환경에 적용이 가능하다. 그러나 라우터들 사이의 이동성과 다른 연결 요소들의 가변적인 요소는 잠재적으로 속도감 있고 예측 불가능하게 변하는 망을 가져올 수 있다. 이에 따른 패킷의 손실이 무선 네트워크에서 자주 발생하게 된다. 최근 몇 년 동안 Ad-hoc망에서 사용되는 라우팅 프로토콜의 각각에 대한 성능을 분석하는 연구가 있었지만, Ad-hoc 무선망에서 특정한 프로토콜의 TCP 버전별 비교 분석에 대한 연구가 미비한 실정이다. 따라서 본 논문에서는 무선 네트워크가 가지는 단점을 보완하고 트래픽 성능을 향상시키기 위한 한 방편으로, Ad-hoc 라우팅 알고리즘인 DSR 프로토콜을 이용하여 TCP Tahoe, Sack, Reno 버전별로 토폴로지의 크기의 변화와 이동 노드의 이동 속도의 변화에 따라 트래픽의 성능을 모의 실험하여 비교 분석하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1000-1003
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• 2015

기존 병원들의 간호사 호출 시스템은 유선 방식으로 입원실과 화장실 벽면에 부착하여 도움이 필요로 할 경우 간호사를 호출한다. 하지만 유선 방식은 장치가 부착된 입원실과 화장실에서만 간호사를 호출 할 수 있다는 큰 단점을 가지고 있다. 만일 병원 내부의 간호사 호출 시스템이 없는 장소에서 환자에게 응급상황이 발생할 경우 환자는 도움을 받지 못하여 2차 사고로 이어질 수 있다. 반면 무선 방식은 환자들에게 개별적으로 장치를 지급하는 것과 잦은 분실에 의해 비용 문제가 발생한다. 본 논문에서는 이러한 문제를 해결하기 위해 스마트폰과 Beacon으로 장소의 제약 없이 보다 신속하고 정확하게 환자의 위치를 담당 간호사에게 전송하는 방식을 이용한다. 그리고 이를 기반으로 하여 기존의 간호사 호출 시스템에서 발생되는 환자 위치 사각지대를 해결한 새로운 Multipurpose Patient Support Systems(MPSS)기술을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.549-552
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• 2004

인터넷 내용선별 체계(Platform for Internet Content Selection: PICS)는 인터넷 내용물을 선별적으로 볼 수 있게 해주는 기반구조로서, 선별 소프트웨어와 등급 서비스들 간에 잘 동작할 수 있게 도와주는 기술규격이다. 그러나 기존 PICS 관련기술들은 유선환경만을 언급하고 있기 때문에 무선환경에 맞는 내용선별 기술이 필요하다. 이에 본 논문에서 우리는 기존 유선망 중심의 PICS 관련기술들이 무선인터넷 내용선별을 위해 적용 가능한지에 중심을 둔 연구수행 결과를 언급한다. 그리고 몇몇 기타 고려사항들을 제공한다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.9
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• pp.1575-1583
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• 2008

Wireless sensor network has merit of low-power, low-cost and self-organization network, so there are many researches substituted for existing wire network. As structure reinforcement work need a high accuracy, many sensors are installed in structure and connected with data logger for monitoring. However this wire data logger method takes a long time to install wires and installed wires obstruct to work. Additionally, wire data logger method represent sensor data by only numeric and graph, it is not able to support a rapid decision-making for working. To resolve wiring problem and support decision-making, we designed and implemented the monitoring system based in wireless sensor network. For verifying performance, accuracy and availability, we simulated and tested our system in real field. Consequently, wireless sensor network method is easier to install and deploy than wire data logger method, user is able to monitor instinctively and overall by 3D representation of structure and sensors, and it show not only accuracy but also performance for many sensors.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.994-997
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• 2009

MANET은 노드가 이동성을 가지고 있으며, 네트워크 위상을 자율적으로 결정하는 특성을 가지고 있다. 정책기반 망 관리 시스템을 MANET에 도입하기 위한 연구는 이러한 네트워크 특성을 고려하여 신뢰성과 효율성을 확보하기 위해 이루어지고 있다. 또한, 정책기반 망 관리 시스템은 유선 네트워크를 기반으로 제안되어 있으므로 이를 MANET에 도입하기 위해서는 여러 가지 수정이 필요한 부분이 있다. 정책 기반 망 관리 시스템은 SNMP의 MIB나 LDAP를 이용하는 정책 저장소와 노드의 상태를 수신하여 정책을 배포하는 정책결정자, 그리고 정책을 수신하여 수행하는 정책 수행자 노드가 있다. 본 논문에서는 MANET 라우팅을 이용하고 표준 정책 기반 망 관리 시스템에서 정책 결정자와 정책수행자 사이의 프로토콜로 제안된 COPS-PR을 MANET에 특성에 맞게 수정한 능동적 PDP 탐색 메커니즘을 이용한 테스트베드를 설계하고 구현한다.

• The Journal of the Korea Contents Association
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• v.7 no.1
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• pp.103-115
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• 2007

The vulnerability issue on IEEE 802.1x wireless LAN has been permits the malicious attack such as Auth/Deauth flooding more serious rather than we expected. Attacker can generate huge volume of malicious traffic as the same methods on existing wired network. The objective of wireless IP Traceback is to determine the real attack sources, as well as the full path taken by the wireless attack packets. Existing IP Traceback methods can be categorized as proactive or reactive tracing. But, these existing schemes did not provide enhanced performance against DoS attack on wireless traffic. In this paper, we propose a 'TTL based advanced Packet Marking' mechanism for wireless IP Packet Traceback with wireless Classification function. Proposed mechanism can detect and control DoS traffic on AP and can generate marked packet for reconstructing on the real path from the non-spoofed wireless attack source, by which we can construct secure wireless network based on AP with enhance traceback performance.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.17 no.6
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• pp.33-39
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• 2017

Today, residential facilities is planned and built based on modular architecture. In the modular housing, sizes and locations of spaces like rooms, kinchin, and bathrooms can be changed from-time-to-time. Therefore, current home automation systems based on predesigned and fixed system with wired sensors can not be suitable for the modular housing. As a result, a new concept-based homw automation system is required which is able to adopt varying home environment. Since the change of spaces will change the number of and types of necessary sensors, the home automation system enables to detect automatically and naturally the added or removed different types of wireless sensors and provides home automation services. In this paper, a home automation system is studied and implemented which can adopt varying space environment by detecting automatically added or removed sensors and provide new user interfaces for displaying sensing information.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.45 no.6
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• pp.114-121
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• 2008

Multi-path routing has been studied widely in wired networks. Multi-path routing is known to increase end-to-end throughput and provide load balancing in wired networks. However, its advantage is not obvious in wireless multi-hop network because the traffic along the multiple paths may interfere with adjacent paths. In the paper, we introduce a new multi-path routing scheme, Cluster-Based Multi-Path Routing for multi-hop wireless networks. The main idea of the proposed routing scheme is to extend the hop-by-hop multi-path to a cluster-by-cluster multi-path. In cluster network, each cluster can work independently from other clusters and hence reduce interference. The purpose of the proposed scheme is to find a less interfering path for wireless multi-hop networks. We also showed the throughput improvement of the proposed scheme through simulations.

• Journal of Advanced Navigation Technology
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• v.15 no.4
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• pp.664-671
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• 2011

The development of IT technology and breakthrough of the network and the wired network, wireless network boundaries disappear and wired and wireless integrated service environment is the advent in online game environment. However, the wired and wireless integrated service environment appropriate security technology is still inactive, wired and wireless integration environment due to the characteristic as well as security threats wired network and security threats in wireless networks should be considered. Therefore, This wired and wireless integrated environment has been considering studied various, Among them wired and wireless environment considering the lightweight of ID-based authentication and key management has been in progress. In recent, Moon et al. pervasive environment in authentication and ID-based key management protocol is proposed. However, Moon et al.'s scheme is use the ID-based public-key approach to decreased the amount of computation. However, pairing by using a technique similar to the existing public key scheme can represent the amount of computation. Therefore, In this paper the way of Moon etc in security vulnerability analysis.

• Journal of the Institute of Electronics and Information Engineers
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• v.52 no.7
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• pp.10-14
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• 2015

Recently, the collection of the sensor data and its analysis become important as the smart buildings equipped with the various sensors appear as a usual scene. The interconnection through the wire cable among the sensors is indispensible because of the information collections such as the temperature, the humidity, and the luminance in the rooms and the hallways for the effective management of the in-building energies. However, these interconnections through the cabling will be very costly, time-consuming, and a difficult task since they will cause some damages to the buildings. Therefore, the interconnections through the unwired connections are required in terms of the deployment effectiveness such as time and cost In this paper, the design and the short sequence operation appropriateness are confirmed through the simulation of the signal measurement system for in-building propagation characteristics based on short signature sequence and the analysis of the system characteristics based on the false alarm probability is performed thereafter.