Dong-Sung Kim

Maximum allowable delay bounds of networked control systems

This paper proposes a new method to obtain a maximum allowable delay bound for a scheduling of networked control systems. The proposed method is formulated in terms of linear matrix inequalities and can give a much less conservative delay bound than the existing methods. A network scheduling method is presented based on the delay obtained through the proposed method, the bandwidth of a network is allocated to each node and the sampling period of each sensor and controller is determined. The presented method can handle three types of data (periodic data, sporadic data, and message) and guarantees real-time transmission of periodic and sporadic data, and minimum network utilization for non-real time message.

A scheduling method for network-based control systems

This paper presents a scheduling method for network-based control systems with three types of data (periodic data, sporadic data, and messages). As a basic parameter for the scheduling method for network-based control systems, a maximum allowable delay bound is used,which guarantees stability of network-based control systems and is derived from characteristics of the given plant using the presented theorems. The presented scheduling method for network-based control systems can adjust the sampling period as small as possible, allocate the bandwidth of the network for three types of data, and exchange the transmission orders of data for sensors and actuators. In addition, the presented scheduling method guarantees real-time transmission of sporadic and periodic data, and minimum utilization for nonreal-time messages. The proposed method is shown to be useful by examples.

Design and implementation of home network systems using UPnP middleware for networked appliances

This paper describes the design and implementation of a home network system using UPnP middleware and an embedded interface device. The developed home network system comprises a home server program, appliance emulators (e.g., for TV, refrigerator, and air-conditioner), and an embedded interface device for networked home appliances.

A study on a platinum–silicon carbide Schottky diode as a hydrogen gas sensor

Abstract The mechanism of hydrogen sensing by platinum–silicon carbide Schottky diode was investigated over the temperature range of 100–500°C. The effects of hydrogen adsorption on the parameters such as barrier height, initial rate of hydrogen adsorption, and hydrogen reaction kinetics were investigated.

A new home network protocol for controlling and monitoring home appliances - HNCP

In this paper, a new control network protocol, HNCP (home network control protocol), is proposed for controlling and monitoring home appliances. HNCP is a four-layered protocol and the standard message set is specified to guarantee interoperability between different home appliances and vendors. HNCP also specifies a detailed device-modem interface structure that guarantees the flexibility of modems.

Adaptive Channel State Routing for Home Network Systems Using Power Line Communications

In this paper, an adaptive channel state routing (ACSR) algorithm is proposed for home network systems based on power line communications (PLCs). The ACSR uses two metrics of channel state indicator (CSI) and distance to detect the state of a power line channel dynamically changed due to harsh power line environments with unstable and asymmetric paths. For decreasing network traffic, the ACSR provides each node with a probabilistic flooding method according to the number of neighboring nodes. For the performance evaluation of the A CSR, a test-bed that includes PLC modems with the ACSR is set up in a noisy environment. Experimental results show the feasibility of the ACSR algorithm.

Home network control protocol for networked home appliances

We propose a new home network protocol for networked home appliances (NHAs). The proposed protocol is designed for a control network using power line communication, and has low resource overheads and low cost for the NHAs, which operate on an 8-bit microprocessor. The proposed protocol network is implemented in a home control network system that comprises a home server and networked home appliances, such as washing machines, microwave ovens and air conditioners

Design and implementation of home server system using UPnP middleware

A home server system is designed and implemented. The proposed home system is composed of a server/client program, appliance emulators and power line adaptors. The developed home sever architecture is designed for remote control and monitoring of home appliances using UPnP (universal plug and play) middleware based on power line communication.

Design and implementation of home network control protocol on OSGi for home automation system

This paper proposes an architecture of a home automation system using a home network control protocol (HNCP). The proposed architecture allows users to control and monitor networked home appliances using HNCP. HNCP bundle on the Open Services Gateway Initiatives (OSGi) framework is implemented and tested in a prototype of the home automation system

Implementation of virtual factory using MMS companion standard

In this paper, a virtual factory using the manufacturing message specification (MMS) companion standard is implemented. The MMS companion standard (9506-3/spl sim/9506-7) and virtual machines are designed and implemented for robot, numerical controller (NC), programmable logic controller (PLC), and process control (PC). Finally, the MMS Internet monitoring system (MIMS) is developed for the testing system.