Hyun-joong Kang

Design and Implementation of Wireless Sensor Network for Ubiquitous Glass Houses

Recently, there are many researches to enable future ubiquitous environments based on wireless sensor network (WSN). Various sensing devices deployed in wireless sensor network collect meaningful data from physical environments and the data are delivered to neighbor node through radio interfaces for further processing. The representative application in WSN is a data collecting system, which monitors physical phenomena and gathers data around our life. In this system, sensor nodes can be considered as a kind of database and hosts connected to the Internet, in most cases, initiate some queries destined to WSN and collect query responses from WSN. In this study, the efficient use of limited energy efficiently for the WSN based large scale glass houses was researched. We designed an integration method which was based on WSN Gateway which integrated two different networks efficiently. To realize the proposed design, we implemented an efficient routing method and WSN Gateway in the wired and wireless integrated networks in ubiquitous glass houses.

Effect of Sensor Specific Crop Location on Wireless Sensor Network Performance

Because a sensor node is operated at a low power, a good communication can hardly be done when an obstacle exists in inter-node’s communication point. In this study, a simulation environment was made using a shadowing model for the position of sensor node and the communication impact by crop in observing the crop’s growth and a greenhouse environment. In such developed simulation environment, the simulation was conducted through changing ad-hoc routing protocols for the sensor node. We could validate that there was a difference in the performance of sensor node according to the installed position through the simulation result. Also, we could confirm that there were different characteristics respectively depending on the routing protocol. We consider that such result will be useful to provide strategies for designing the effective routing protocol for an agricultural environment such as the greenhouse in the future.

Design of efficient routing method for USN based Large-scale Glass Greenhouses

Wireless communication technology and state-of-the-art miniaturization have enabled the wireless sensor network with smart environmental sensors. The sensor network is a new field which has been vigorously researched in the ubiquitous computing and ad hoc network. How efficiently use the limited energy in this USN (ubiquitous sensor network) has been debated. Utilizing the directed diffusion and gossiping algorithm which is based on the large-scale glass greenhouses, we present a method to prolong the lifespan of the sensor network by transmitting the relevant control packet on an aperiodic basis. In the paper, we present a method to minimize the energy consumption of sensor nodes within glass greenhouses and ensure stable network operation at the same time through energy efficient routing between sensor nodes.

Design and Implementation of WSN Based Stable Management System

WSN (Wireless sensor networks) based on low-power technologies is one of the important technologies currently available in constructing ubiquitous society and is applied in various fields, including, environmental monitoring, disaster management, logistics management, and home network. In this paper, we proposed a WSN-based stable management system as one of the WSN applications. This stable management system consists of sensor manager and CCTV manager with a purpose of gathering environmental data and disposing this data into useful information. By using the WSN based stable management system, a raiser can monitor and manage the stable at anytime from anyplace so the environment of a stable could be optimized and the productivity of a stable would be increased.

A Study on Data Transmission Performance of Sensor Networks for Livestock Feedlot

Recent development of versatile small size and multifunctional wireless sensor nodes enables the research on various applications to improve human life with rich information and automation. In this study, we virtually simulated the efficiency of the livestock feedlot sensor network by utilizing the propagation model, as one of the different methods of collecting data regarding livestock in feedlot is researched. As indicated in the conclusion of the study, the differences in terms of the methods make a difference to the amount of dropped data packets. It is believed that the observations made in this study could prompt the development of more effective methods of collecting data regarding livestock in feedlots by adopting additional devices or alternative routing manner.

A Study on the Design of Ubiquitous Sensor Networks Based on Wireless Mesh Networks for Ubiquitous-Greenhouse

Ubiquitous Sensor Networks (USNs) based on IEEE 802.15.4 is implemented in diversified fields such as environmental monitoring, disaster management, logistics management and home network, etc. By implementing such Ubiquitous Sensor Networks technology to Greenhouses it is possible to develop Ubiquitous-Greenhouse that allows environmental monitoring and actuator control. But, it is inadequate to operate large-scale network configured by expanding the network with limited energy resources of a sensor node. Therefore in this study, we virtually implemented Mesh coordinators between the sensor devices and data transmission paths toward a Gateway to solve above mentioned problem. In addition, to verify performance of the proposed USN based on Wireless Mesh Networks, we also conducted simulation on general USN based on IEEE 802.15.4 under identical environments then comparatively analyzed from acquired results of both simulations. Result has shown the performance of the proposed USN based on Wireless Mesh Networks (WMNs) having better performance, in terms of data transmission efficiency and energy consumption than USN based on IEEE 802.15.4.