• Journal of Engineering Education Research
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• v.13 no.2
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• pp.7-11
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• 2010

As the development of the computer and communication technologies, the ubiquitous society can be realized to the world early in the future. Thus, the localization system in Wireless Personal Area Network (WPAN) is required for many users of ubiquitous society to provide the ubiquitous computing based applications in respective of anytime and anywhere. In this paper, we propose the distance measurement scheme that is based on the distance measurement using RSSI (Received Signal Strength Indicator) of sensor module considering of two distance conditions for the localization system using Zigbee in WPAN. Also, the localization errors of the proposed scheme are analyzed in the three scenarios that the mobile module tracks in the in $6m{\times}6m$ scaled experimentation area. In addition to this, the monitoring subsystem is developed using GUI (Graphical User Interface) in order to monitor the location of the moving objects accurately and user-friendly.

• Proceedings of the Korean Society of Computer Information Conference
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• 2015.01a
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• pp.343-344
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• 2015

본 논문에서는 무선 센서 네트워크 기반의 전력 소모 측정 데이터를 모바일 기기로 제공하는 전력 검침 시스템을 제안한다. 디지털 전력량계의 전력 소모 측정데이터를 전송하는 아두이노 보드와 전송된 정보를 수신하는 게이트웨이 및 수집된 전력량을 환산하는 서버와 소비전력을 스마트폰에 모니터링하는 앱으로 구성된다. 전력미터기는 Zigbee를 이용한 Sensor Network를 구성하여 전력데이터를 전송하며 아두이노 보드를 통해 서버에서 소모전력량과 요금을 계산하고, 무선 LAN을 통해 서버에 접속한 모바일 단말기에 전력사용량을 실시간으로 알 수 있도록 한다. 이러한 전력 검침 시스템을 구현하여 실시간으로 집안의 소모전력을 모니터링할 수 있으며 전력절감을 유도하는 것을 목적으로 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.589-591
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• 2009

본 논문에서 제안하고 있는 RT-WISN(Real Time-Wireless Image Sensor Network)는 과거의 무선이미지 전송 기술에 비해 적은 전력을 소모하고 빠른 전송이 가능하게 하는 기술이다. 제안된 RT-WISN은 IEEE802.15.4 표준을 따르고 있으며, 현재 본 연구실에서 개발하고 있는 UoC(Ubiquitous on Chip) 메모리 구조를 응용하여 사용하고 있다. 본 논문에서 제안하고 있는 RT-WISN은 전송하고자 하는 대상이 되는 영상정보의 움직임 변화를 영상 전송 임계값 값을 사용하여 데이터 전송 시기를 결정함으로써 기존의 시스템에 비해 노드의 에너지를 보다 효율적으로 관리할 수 있는 기법 이다. 또한 본 논문에서는 제안된 전용 프로세서를 사용하여 보다 넓은 대역폭에서 필요한 영상 데이터를 효율적으로 전송할 수 있어 전송 시간 제어에 보다 용이함을 제공 한다. 무선센서 네트워크에서 이런 점들은 각 노드들의 생존 시간을 향상하게 되고, 고속의 전송이 가능하게 하는 장점으로 작용하게 된다. 본 논문에서는 Peer-to-Peer 상에서 실제 설계된 메모리 구조를 사용하여 이미지를 무선으로 전송하고 그 전송 시간과 도달률을 측정하여 RT-WISN이 무선 센서 네트워크에서의 검출된 영상 정보의 전송에 적합함을 보인다.

• Journal of the Korea Computer Industry Society
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• v.10 no.5
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• pp.193-200
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• 2009

In this paper, the raid and fire preventable system using Zibee module with IEEE 802.15.4 wireless communication standard and multi-sensor was developed displaying raid and firing condition with wireless network. The raid preventable system is designed using a ultrasonhe waves sensor and infrared sensor. The fire preventable system is designed using a thermistor. The datas for raid and firing condition are communicated from enddevice to coordinator with wireless network and are displayed on PC monitor.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.539-542
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• 2008

Wireless sensor network devotes to improving energy efficient and reducing energy costs.We have to monitor in building for 24hours not to incur expansive energy costs in case of problem about a thermostat of buildings or logistics warehouse. It is to incur serious problems of safety of keeping products and a waste of energy. In this paper, establishes a logistics warehouses system based by Zigbee technology to solve that problem.

• Journal of Advanced Marine Engineering and Technology
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• v.41 no.4
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• pp.353-361
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• 2017

As ship-based tourism increases, safe sailing and management are necessary to prevent maritime accidents. Because external rescue support cannot arrive rapidly in the case of ship-related accidents, the initial response is very important for damage minimization. Further, for secondary damage prevention, it is necessary to accurately determine passenger positions. In this paper, considering the characteristics of a ship, the enhanced-Zigbee(e-Zigbee) position determination technology (PDT) is applied, which improved upon the Zigbee PDT by having advantages such as low power consumption and smaller size. According to user needs, a low-cost and high-precision passenger positioning tag and access point(AP) is provided. A ship testbed that yields improved positioning accuracy based on a performance evaluation is constructed.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.9B
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• pp.811-820
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• 2006

In this paper, The correlation of the power consumption of sensor node is analyzed according to the analyze parameter in IEEE 802.15.4 star sensor network. And It is studied the influence on analysis parameter. The power consumption of sensor network in transmission process and average transmission power consumption drives to numerical formula. And CSEM WiseNET system measurement value is used. As a simulation result, The power consumption of sensor node in star network consist of 10 sensor nodes is more than 20 % that in single network in average. When beacon signal interval is 0.1 second in all frequency bands, the power consumption of sensor node in up-link is more than 2.5 times that in down-link in average. When beacon signal interval is 1 second and the number of sensor nodes increases to 100 and sensing data increases to 100 byte, the power consumption of sensor node increases to 2.3 times. And The superior performance of 2.4 GHz frequency band has than 868/915 MHz frequency band up to $6{\sim}12$ times.

• Convergence Security Journal
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• v.7 no.1
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• pp.35-43
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• 2007

The object of this paper is to design a biomedical signal measure systems based on sensor networks for the patient, integrated with computing technology. Using a combination of zigbee RF, embedded hardware and software technologies, as it allows the healthcare center to receive the information on emergency situations and the ordinary state of the patients individually or simultaneously, the healthcare center can copy with quickly a state of emergency and assist the normal life of the patient. In order to meet the low power and other requirements for the proposed system, we introduce a zigbee based RP which is the most suitable solution for improving the performance of our beeper system.

• Journal of the Korean Society of Industry Convergence
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• v.26 no.5
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• pp.867-874
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• 2023

In this paper, a wireless communication-based sensor data monitoring device with an explosion-proof (Exd IIC) case was implemented to enable installation at explosion-risk industrial sites such as plants. In existing industrial plant sites, most of the temperature sensors and vibration and impact sensors are wired up to several kilometers, which takes a lot of time and money to bury long pipes and cables. In addition, there are not many cases where some wireless devices have been applied to actual plant industry sites due to communication quality problems. Therefore, in order to solve this problem, zigbee mesh wireless communication was applied to provide high reliability wireless communication quality to industrial plant sites, and the time and cost incurred in new or additional installation of sensors could be greatly reduced. In particular, in the event of loss or error of some wireless communication devices, the communication network is automatically bypassed or recovered to enable real-time data monitoring.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.11 s.353
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• pp.16-24
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• 2006

In this paper, we implement a U-healthcare system that can be applied to a service integration system. This system consists of a wireless network system a sensor module, and a integration server. The wireless network system collects data and the sensor module measures body fat, blood pressure, quantity of exercise, and SPO2. The server integrates user certification, security service and VOD service and collects user health information in real-time, and sends the data in case of emergency to a doctor or guardian.