• 한국정보전자통신기술학회논문지
• /
• 제9권6호
• /
• pp.624-629
• /
• 2016

Recently various types of disaster monitoring system using smart-phones are under active studying. In this paper, we propose a system that automatically performs the disaster and fire detection. Additionally we implement the Arduino-based smart image sensor system in the web platform. When a fire is detected, an SMS is sent to the Fire and Disaster Management Agency. In order to improve fire detection probability, we proposed a smart Arduino fire detection sensor simulation which searches the smart sensor inference algorithm using fuzzy rules.

• 한국통신학회논문지
• /
• 제17권4호
• /
• pp.379-386
• /
• 1992

In this paper a direction finding method which can which can estimate the direction angles of source signals impinging on the sensor array in which sensor noises are correlated is studied. This method performs the estimation of source direction angles form sensors, regardless of sensor noise correlation, by eliminating the sensor noise correlation coefficient which can be accurately estimated. Finally, this paper shows, through the computer simulation, that the proposed, method is extremely useful and superior when there exists the noise correlation between sensors, .

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2005년도 추계종합학술대회
• /
• pp.799-802
• /
• 2005

In this paper, we analyses of Key Management Protocol for Wireless Sensor Networks in Wireless Sensor Networks. Wireless sensor networks have a wide spectrum of civil military application that call for security, target surveillance in hostile environments. Typical sensors possess limited computation, energy, and memory resources; therefore the use of vastly resource consuming security mechanism is not possible. In this paper, we propose a cryptography key management protocol, which is based on identity based symmetric keying.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2007년도 춘계학술발표대회
• /
• pp.1535-1537
• /
• 2007

A design pattern is a general solution to a commonly occurring problem. Design patterns have proven highly effective in representing, transferring, and applying the design knowledge in many engineering disciplines. However, these patterns have not addressed sensor network specifically. With a growth of sensors and sensor networks, and considering their profound applicability, there is a crucial need to articulate ones experience of application development or deployment of sensor nodes in the form of design patterns to avoid the future mistakes. This paper discusses the same issue and show applicability of design patterns in sensor networks.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.1023-1026
• /
• 2005

In the ubiquitous computing environment, an intelligent vehicle is defined as a sensor node with a capability of intelligence and communication in a wire and wireless network space. To make it real, a lot of problems should be addressed in the aspect of vehicle mobility, in-vehicle communication, common service platform and the connection of heterogeneous networks to provide a driver with several intelligent information services beyond the time and space. In this paper, we present an intelligent information system for managing in-vehicle sensor network and a vehicle gateway for connecting the external networks. The in-vehicle sensor network connected with several sensor nodes is used to collect sensor data and control the vehicle based on CAN protocol. Each sensor node is equipped with a reusable modular node architecture, which contains a common CAN stack, a message manager and an event handler. The vehicle gateway makes vehicle control and diagnosis from a remote host possible by connecting the in-vehicle sensor network with an external network. Specifically, it gives an access to the external mobile communication network such as CDMA. Some experiments was made to find out how long it takes to communicate between a vehicle's intelligent information system and an external server in the various environment. The results show that the average response time amounts to 776ms at fixed place, 707ms at rural area and 910ms at urban area.

• 한국정보과학회논문지:정보통신
• /
• 제35권2호
• /
• pp.120-129
• /
• 2008

정보 수집이 목적인 센서 네트워크에서 자신의 전력을 절약하기 위해 다른 노드들의 패킷을 의도적으로 전송하지 않는 이기적인 노드가 포함되어 있을 수 있다. 이를 해결하기 위해 크레딧을 이용한 패킷 전송에 따른 지불 방법을 제안하였다. 센서 노드들이 패킷을 전송할 때, 크레딧을 사용하게 하고, 다른 노드들의 패킷을 전송하는 것을 통해 크레딧을 얻을 수 있게 하였다. 크레딧의 신뢰성을 보장하기 위해서 싱크 노드와 서버의 역할을 통합하고 piggybacking 기법을 이용하여 추가적인 리포트 메시지를 송신하지 않도록 하였다. 또 위치상의 이유로 다른 노드들이 전송하는 패킷을 받지 못하여 크레딧을 얻지 못하는 노드를 찾아 크레딧을 추가 지급함으로써 부당하게 대우를 받는 문제를 해결하였다. 제안된 방법의 성능 평가를 위하여 네트워크 시뮬레이션(ns2)를 이용하여 구현하였으며. 실험 결과, 이기적인 노드를 처리하기 위해 패킷 지불 방식만을 이용한 것보다 패킷 전송률이 높게 유지되었고, 시뮬레이션 시간 내 도착된 패킷의 총 개수 또한 증가하였다. 그리고 센서 노드의 전력 소모량이 줄어들어 노드들이 살아 있는 시간이 길어짐을 확인할 수 있었다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제11권2호
• /
• pp.1005-1018
• /
• 2017

This paper proposes an App Visualization (AppV) based on IoT Self-diagnosis Micro Control Unit (ISMCU) for accident prevention. It collects a current status of a vehicle through a sensor, visualizes it on a smart phone and prevents vehicles from accident. The AppV consists of 5 components. First, a Sensor Layer (SL) judges noxious gas from a current vehicle and a driver's driving habit by collecting data from various sensors such as an Accelerator Position Sensor, an O2 sensor, an Oil Pressure Sensor, etc. and computing the concentration of the CO collected by a semiconductor gas sensor. Second, a Wireless Sensor Communication Layer (WSCL) supports Zigbee, Wi-Fi, and Bluetooth protocol so that it may transfer the sensor data collected in the SL to ISMCU and the data in the ISMCU to a Mobile. Third, an ISMCU integrates the transferred sensor information and transfers the integrated result to a Mobile. Fourth, a Mobile App Block Programming Tool (MABPT) is an independent App generation tool that changes to visual data just the vehicle information which drivers want from a smart phone. Fifth, an Embedded Module (EM) records the data collected through a Smart Phone real time in a Cloud Server. Therefore, because the AppV checks a vehicle' fault and bad driving habits that are not known from sensors and performs self-diagnosis through a mobile, it can reduce time and cost spending on accidents caused by a vehicle's fault and noxious gas emitted to the outside.

• 한국정보통신학회논문지
• /
• 제12권5호
• /
• pp.870-878
• /
• 2008

센서 네트워크를 구성하는 센서 노드는 대부분 보안성이 낮으며, 낮은 연산 능력과 적은 저장 용량으로 효율적인 보안 알고리즘을 적용할 수 없다. 따라서 불법적인 노드의 침입을 억 제할 수 없으며, 센서 노드의 전송 알고리즘만 알게되면 전송되는 정보를 쉽게 도청 할 수 있는 문제점을 갖게 된다. 본 논문에서는 센서 네트워크를 클러 터로 구분하고, 클러스터 내에서 센서 노드가 안전하게 정보를 전송할 수 있으며 불법적인 센서 노드의 침입을 억제할 수 있는 극좌표를 이용한 클러스터 기반의 센서 네트워크의 키 관리기법을 제안한다. 제안된 기법에서는 클러스터 내에서 모든 센서 노드는 CH(Cluster Header)가 제공하는 피벗값을 기반으로 인증키를 설정하도록 하고있다. 시뮬레이션 결과 기존의 페어 와이즈(pair-wise) 기법에 비하여 키 관리측면에서 안전한 키 관리와 불법적인 노드의 침입을 억 제할 수 있는 우수함을 증명하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제3권2호
• /
• pp.195-208
• /
• 2009

In this paper, we introduce a grid-based key pre-distribution scheme in wireless sensor networks, which aims to improve the connectivity and resiliency while maintaining a reasonable overhead. We consider simplification of the key establishment logic and enhancement of the connectivity via plat polynomial assignment on a three-dimensional grid for node allocation and keying material assignment. We demonstrate that our scheme results in improvements via a detailed discussion on the connectivity, resource usage, security features and resiliency. A comparison with other relevant works from the literature along with a demonstrated implementation on typical sensor nodes shows the feasibility of the introduced scheme and its applicability for large networks.

• 전기학회논문지
• /
• 제59권7호
• /
• pp.1302-1308
• /
• 2010

In this study, Zigbee Sensor Node to transmit harmful gases CO and $CO_2$ information using wireless communication within the ground and underground structures were developed. Wireless communication protocol was used Zigbee Stack included IEEE 802. 15.4 MAC protocol. For wireless transmission of detected harmful gas signal from ADC of MCU was implemented Zigbee Sensor Node that was developed protocol using Serial-Port-Profile(SPP) here. The proposed Zigbee Sensor Node was verified transmission distance from experiments. Transmission distance was into 90m in experiments. Distance experiments were measured at 10m intervals using sine & pulse wave input signal at indoors. The proposed Route Sensor Node was applied mesh routing protocol. When built up USN(Ubiquitous Sensor Network)using Route Sensor Node, transmission distance was not limited. On the experimental results, harmful gas values between direct measurements and USN measurements were consistent. The semiconductor CO sensor and N-DIR $CO_2$ sensor module as a harmful sensor was used. Therefore, the proposed Zigbee Sensor Node was verified about reliability and validity to build USN for transmission of harmful gas information.