• Journal of the Korea Institute of Information and Communication Engineering
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• v.14 no.4
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• pp.803-808
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• 2010

Wireless Sensor Networks are widely applied for organizing real-time monitoring systems. Unlike general kinds of sensor networks, it is important to preferential send emergency data to the control server when urgent events are occurred. But IEEE 802.15.4 MAC protocol which is generally deployed for wireless sensor network does not support algorithm for urgency data handling. Therefore, we proposed a MAC protocol which consider the priority for the urgency data handling.

• The KIPS Transactions:PartC
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• v.14C no.7
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• pp.571-582
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• 2007

Vehicular ad-hoc networks is temporarily established through inter-vehicle communication without any additional infrastructure aids. It requires a immediate message propagation because it mainly deals with critical traffic information such as traffic accidents. The distance-based broadcast scheme is one of the representative broadcast schemes for vehicular ad-hoc network. In this scheme, a node to disseminate messages is selected based on a distance from a source node. However, a message propagation delay will be increased if the relay nodes are not placed at the border of transmission range of the source node. In particular, when the node density is low, the message propagation delay is getting longer. In this paper, we propose a time-window reservation based relay node selection scheme. A node receiving the alert message from the source node has its time-window and randomly selects its waiting time within the given time-window range. A proportional time period of the given time-window is reserved in order to reduce the message propagation delay. The experimental results show that the proposed scheme has shorter message propagation delay than the distance-based broadcast scheme irrespective of node density in VANET. In particular, when the node density is low, the proposed scheme shows about 26% shorter delay and about 46% better performance in terms of compound metric, which is a function of propagation latency and network traffic.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10c
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• pp.883-885
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• 2001

Wave Pipelining(WP) 기법을 적용한 가상버스(Virtual Bus) 네트워크 구조는 병렬 컴퓨팅에서 중요한 메시지의 긴급성을 효과적으로 지원한다. 우리는 효율적인 통신을 지원하는 가상버스에 적합하도록 MPI를 설계, 구현(MPI/VBus)하였다. 또한, MPI/Vbus와 디바이스 드라이버가 메시지 큐들을 커털 영역에서 공유하도록 설계함으로써 사용자 레벨 통신(User Level Communication)을 쉽게 구현할 수 있도록 했다.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.05a
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• pp.109-110
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• 2020

최근 엣지 컴퓨팅을 활용한 자율주행차 서비스 개발 연구가 진행 중이다. 특히, 최근 개발 중인 차량 엣지 컴퓨팅 기술은 도로 상황 및 교통 정보를 실시간으로 수집하여 빠른 처리를 통해 안정된 차량 및 교통 서비스를 제공할 수 있는 기술로 평가받고 있다. 따라서 본 논문에서는 자율주행차 서비스를 위해 차량 엣지 컴퓨팅 간, 엣지-클라우드간 협업 모델을 제안하고 차량 안전 메시지와 같은 긴급 메시지의 빠른 전달을 위한 초지연 메지시 전달 기법을 제안한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.6
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• pp.103-110
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• 2012

In Vehicle Safety Communication (VSC), noted as a representative application of VANET technologies, emergency warning messages (EWM) are broadcast over vehicles in response to an emergency situation. However, as the number of vehicles increases, the so-called Broadcast Storm Problem often occurs due to a huge number of redundant EWM transmitted. Though many approaches in the literature have been proposed to solve the problem, most of them require the preliminary phase for setting up or refreshing neighbor relationship through exchanging beacon messages with nearby vehicles, thereby further increasing the traffic load. In this paper, we propose Longest Leaping Relay (LLR) scheme which can efficiently solve the Broadcast Storm Problem without any preliminary phase for setting up neighbor relationship. Through computer simulations, we compared the performance of the proposed scheme with competitive schemes and verified the proposed scheme outperforms the existing schemes.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.05a
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• pp.529-530
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• 2016

When the mountain accident occurred, the accident victims should inform anyone of information of the location and accident situation rapidly. But if you are in the radio shadow area where you cannot use GPS, 3G/4G, and wireless communication, you can't inform someone your accidents. In this paper, we suggest the emergency rescue request notification service in situation that victims can't report their accidents. This service is to send request message for rescue in radio shadow area, in mountain accident, by BLE(Bluetooth Low Energy).

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.206-208
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• 2013

The fact that the gigantic and luxurious cruise, Titanic, sank into the cold winter sea causing 1,490 casualties in 1912 resulted in discussing safety of life at sea international and Korea has adopted and operated the GMDSS to keep up with those international endeavors to decrease the number of tragic accidents at sea, However, all GMDSS equipment is making a monotonous beep sound when receiving a distress, emergency, safety and even general message so that it might contribute to lowering ship operators' cognitive abilities as well as being dull of safety precautions. So, I'd like to render great services for saving even one person by considering developing an automatic audio alarm device which allows people to respond in a prompt manner as soon as they hear an audion alarm such as a shipwreck.

• Journal of Convergence for Information Technology
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• v.11 no.11
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• pp.23-30
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• 2021

Due to the recent advancements of mobile telecommunication technology and high mobile phone penetration rate, researches on emergency text alert service for enhancing the accessibility have been actively conducted. The worldwide spread of COVID-19 further accelerates the efforts for the alert services. Existing emergency text services are simple and efficient. However, unclear reception area may cause unintended alert messages frequently. In this paper, we analyze survey results regarding the 5G-based text-alert services to derive service requirements for technological advancement. Then we propose an emergency disaster text service scenario using Active Geo-Targeting that enables active disaster text reception of terminals. In addition, we newly define an interface protocol that is CIB(Control Information Block) to operate the proposed scenario.

• Journal of Advanced Navigation Technology
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• v.13 no.2
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• pp.224-230
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• 2009

In the latest date, medical body area networks (MBANs) are emerging as a new technology for diagnosis the human body. MBANs in the health care fields are based on short-range and low-power (e.g. ubiquitous computing) among small-sized devices, and have been used by means of medical services. In this paper, we proposed an emergency message transmission protocol using carrier sense multiple access/time division multiple access in MBANs. This scheme focuses on dependability and power-efficiency. In order to increase the reliability of the transmission, this scheme modified a MCTA slot of IEEE 802.15.3 standard to a SR-MCTA slot. SR-MCTA slot is assigned by MBAN coordinator according to requesting terminal nodes. The method, having the priority of transmission, occurs a collision packet randomly. Results from this proposed solution revel that reservation-based TDMA medical body area network(MBAN) protocol for transmitting emergency message was improved in terms of transmission delay.

• Proceedings of the Korea Information Processing Society Conference
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• 2000.10b
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• pp.1009-1012
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• 2000

본 논문은 현재 개발되고 있는 원격 중환자 관찰 시스템의 부 시스템인 호출 시스템의 호출 매체 결정 알고리즘에 대하여 기술한다. 이 호출 시스템은 중환자실에 입원중인 환자의 상태 변화에 따라 담당 의사나 환자 보호자를 신속하게 연락하는 역할을 담당한다. 전달되는 메시지는 연락 시점과 연락의 긴급성에 따라서 유선전화, 무선전화, 호출기, 전자우편, fax 등의 통신 매체를 한 개 또는 두 개 이상 이용하여 전달된다. 이러한 메시지의 효율적인 전달을 위하여 본 연구에서는 불확실성 추론 방법인 Dempster-Shafer 이론을 이용하여 주어진 상황에서 가장 효과적인 전달 매체를 선택하는 알고리즘을 개발하였다. Dempster-Shafer 이론을 사용함으로서, 불확실한 상황에서 효율적이고 합리적으로 메시지 전달 매체를 결정할 수 있다.