Kihyun Kim

An Efficient Routing Protocol Based on Position Information in Mobile Wireless Body Area Sensor Networks

In recent years, interests in the application of Wireless Body Area Network (WBAN) have grown considerably. Wireless Body Area Sensor networks consist of fixed sensor nodes. Sometimes, creating such a fixed sensor networks could be a daunting task. Wireless Body Area Sensor nodes assume deploying a stationary sensor network over a human body area. Even if an advanced method to make the deployment safer is used, diverse element will cause a coverage holes. Even though perfect coverage can be achieved initially, various factors such as body movements will certainly degrade network coverage as time goes on. However, mobile wireless body area sensor networks can solve some of the problems. Some node of mobile wireless body area sensor network has mobility. Mobility reinforces fault-tolerance and the scalability of the network. But conventional sensor routing protocols find it hard to deal with the mobile wireless body area sensor networks. Therefore, this study suggests an energy efficient routing scheme by using the location information of a global positioning system (GPS) and the energy levels of sensor nodes.

Implementation of 10 Giga VPN accelerator board

This paper proposes a VPN accelerator board (VPN-AB), a virtual private network (VPN) protocol designed for trust channel security system (TCSS). The TCSS supports safety communication channel between security nodes in Internet. It furnishes authentication, confidentiality, integrity, and access control to the security node to transmit data packets with IPsec protocol. TCSS consists of Internet key exchange block, and security association block, IPsec engine block. The Internet key exchange block negotiates crypto algorithm and key used in IPsec engine block. Security association blocks setting-up and manages security association information. IPsec engine block treats IPsec packets and consists of networking functions for communication. The IPsec engine block should be embodied by HAV and in-line mode transaction for high speed IPsec processing. Our VPN-AB is implemented with high speed security processor that supports many cryptographic algorithms and in-line mode. We evaluate a small TCSS communication environment, and measure a performance of VPN-AB in the environment. The experiment results show that VPN-AB gets a performance throughput of maximum 15.645 Gbps when we set the IPsec protocol with 3DES-HMAC-MD5 tunnel mode

Spraying of swine buildings with lemon grass ( Cymbopogon citratus ) essential oil does not produce blood absorption in swine

Cymbopogon citratus (Lemon grass) essential oils have been used in swine buildings to reduce the offensive odor emanating from swine buildings. The present study was designed to investigate plasma residues of citral which is a major constituent of the essential oils of Cymbopogon citratus. An HPLC method was established, validated and used for the determination of citral in swine plasma harvested from blood samples taken at the 14 th , 21 st and 28 th day after spraying swine buildings with the 3% Lemon grass essential oil. Thereafter, analysis of the sample was conducted using HP ODS Hypersil column (200 × 4.6 mm, 5 µm) with a mobile phase consisting of methanol and 0.5% acetic acid; and a flow rate of 1mL/ min. The method was validated for parameters such as accuracy, precision, linearity and detection limits. Plasma spiked with standard citral (95%) revealed two chromatograms with retention times of about 10.7 and 12.2 minutes. The calibration curves for the citral isomers were found to be linear in the tested concentration ranges and mean recoveries wre 101% and 99.17%. This method was used to determine the residues of citral in swine plasma pretreated with methanol. Surprisingly, there was no any detectable level of citral in swine plasma within the 28 days of exposure. spraying of swine buildings with essential oils of lemon grass oil does not cause plasma residues of citral.

The Path Recovery Method for Wireless Mesh Networks

The hybrid wireless mesh protocol is a mesh routing protocol that combines the flexibility of on-demand routing with proactive topology tree extensions. The wireless mesh network is consisted with mesh points and stations. Even if mesh points or stations have mobility, the path should be kept continuously. Direction of present mobility research is achieved research in mobility of stations. In case the mesh access point moves, this research is very weak. Proposal scheme is emphasizing in the MAP (mesh access point) mobility. After the mesh access point moves, it re-establish existing full path by using RRER message. However, our scheme is available existing path that is changed locally by using the MR (message registration)-message which accomplish locally re-establish path technique. In this paper, we analyze problem in existent HWMPpsilas path establishment technique. We propose New Path Selection Scheme by using MR-message. Simulation results show that proposal scheme is to reduce packet loss.

A Location Based Energy Efficient Intersection Routing Protocol in Mobile Sensor Networks

Typically, sensor networks consist of fixed sensor nodes. Sometimes, creating such a fixed sensor networks could be a daunting task. Sensor nodes assume deploying a stationary sensor network over a dangerous area such as a battlefield. Even if an advanced method to make the deployment safer is used, diverse element will cause a coverage holes. Even though perfect coverage can be achieved initially, various factors such as malicious attacks will certainly degrade network coverage as time goes on. However, mobile sensor networks can solve some of the problems. Each node of mobile sensor network is mounted on various unmanned vehicles as a result the sensor nodes have mobility. Mobility reinforces fault-tolerance and the scalability of the network. But conventional sensor routing protocols find it hard to deal with the mobile sensor networks. Therefore, this study suggests an energy efficient routing scheme by using the location information of a Global Positioning System (GPS) and the energy levels of sensor nodes.