Kyoung Nam Ha

A pyroelectric infrared sensor-based indoor location-aware system for the smart home

Smart home is expected to offer various intelligent services by recognizing residents along with their life style and feelings. One of the key issues for realizing the smart home is how to detect the locations of residents. Currently, the research effort is focused on two approaches: terminal-based and non-terminal-based methods. The terminal-based method employs a type of device that should be carried by the resident while the non-terminal-based method requires no such device. This paper presents a novel non-terminal-based approach using an array of pyroelectric infrared sensors (PIR sensors) that can detect residents. The feasibility of the system is evaluated experimentally on a test bed

Resident Location-Recognition Algorithm Using a Bayesian Classifier in the PIR Sensor-Based Indoor Location-Aware System

Intelligent home service systems consist of ubiquitous sensors, a home network, and a context-aware computing system that together collect residential environment information and provide intelligent services such as controlling the environment or lighting. Determining a residents location in the smart home or smart office is a key to such a system. This correspondence presents an enhanced location-recognition algorithm using a Bayesian classifier for the pyroelectric infrared sensor-based indoor location-aware system that is a nonterminal-based location-aware system proposed in a previous paper. This correspondence compares the conventional and enhanced location-recognition algorithms and their performance. The feasibility of the system is evaluated experimentally on a test bed.

Development of PIR sensor based indoor location detection system for smart home

Smart home is expected to offer various intelligent services by recognizing residents along with their life style and feelings. One of the key issues for realizing the smart home is how to detect the locations of residents. Currently, the research effort is focused on two approaches: terminal-based and non-terminal-based method. The terminal-based method employs a type of device that should be carried by the resident while the non-terminal-based method requires no such device. This paper presents a novel non-terminal-based approach using an array of pyroelectric infrared sensors (PIR sensors) that can detect residents. The feasibility of the system is evaluated experimentally on a test bed

Wireless networked control system using NDIS-based four-layer architecture for IEEE 802.11b

This paper presents the feasibility of using the IEEE 802.11b protocol for wireless networked control systems (NCSs). The IEEE 802.11b protocol is considered to be not suitable for industrial networking because the medium access control method is contention-based CSMA/CA, which exhibits unstable performance with an unbounded delay distribution under heavy traffic. To avoid these limitations, we present a four-layer architecture for IEEE 802.11b based on the network driver interface specification (NDIS) combined with a virtual scheduling algorithm. We compare the performance of NDIS-based wireless NCS to that of a conventional wireless NCS. Experimental results show that the NDIS-based four-layer architecture for IEEE 802.11b is a very promising alternative for wireless industrial networking.

NDIS-based virtual polling algorithm for IEEE 802.11b for guaranteeing the real-time requirements

This paper focuses on the feasibility of IEEE 802.11b wireless LAN for real-time wireless industrial network. In general, it has been known that IEEE 802.11b is not suitable for industrial networking because its medium access control method is the contention-based CSMA/CA (carrier sensing multiple access with collision avoidance) that exhibits unstable performance under heavy traffic and unbounded delay distribution. As an attempt to circumvent the probabilistic nature, this paper presents an enhanced four-layer architecture using the network driver interface specification (NDIS) and a virtual polling algorithm. Also, the enhanced four-layer architectures performance is compared with that of conventional IEEE 802.11b. Based on the experimental results, it is found that the enhanced four-layer architecture for IEEE 802.11b is a very promising alternative for wireless industrial networking.

NDIS-based virtual polling algorithm of IEEE 802.11b for guaranteeing the real-time requirements

This paper focuses on the feasibility of IEEE 802.11b wireless LAN for real-time wireless industrial network. In general, it has been known that IEEE 802.11b is not suitable for industrial networking because its medium access control method is the contention-based CSMA/CA (carrier sensing multiple access with collision avoidance) that exhibits unstable performance under heavy traffic and unbounded delay distribution. As an attempt to circumvent the probabilistic nature, this paper presents an enhanced four-layer architecture using the network driver interface specification (NDIS) and a virtual polling algorithm. Also, the enhanced four-layer architectures performance is compared with that of conventional IEEE 802.11b. Based on the experimental results, it is found that the enhanced four-layer architecture for IEEE 802.11b is a very promising alternative for wireless industrial networking.

Performance evaluation of MAC layer of LnCP and LonWorks protocol as home networking system

Recently, various home network systems, such as LonWorks, Echonet, and LnCP, etc., are developed to enhance customers comfort and convenience. However, it is not known that performance of any protocol is superior. Hence, this paper evaluates performance of LnCP (living network control protocol) by LG Electronics and LonWorks by Echelon. For this purpose, we have developed simulation model using state diagram of LonWorks and LnCP, and simulation conditions through analysis of message to be generated in the smart home. Also, we evaluate performance, such as maximum transmission delay and mean transmission delay, of both protocols

Performance evaluation of NDIS-based four-layer architecture with virtual scheduling algorithm for IEEE 802.11b

This paper presents the feasibility of IEEE 802.11b protocol for real-time wireless industrial network. Generally, because the medium access control method of IEEE 802.11b is the contention-based CSMA/CA that exhibits unstable performance with an unbounded delay distribution under heavy traffic, it has been known that it is not suitable for industrial networking. As an effort for avoiding the uncertainty of IEEE 802.11b, this paper presents a NDIS-based four-layer architecture of IEEE 802.11b with a virtual scheduling method using the network driver interface specification (NDIS). Also, the performance of NDIS-based four-layer architecture is compared with that of conventional architecture of IEEE 802.11b. Based on the experimental results, it is found that the NDIS-based four-layer architecture of IEEE 802.11b is a very promising alternative for wireless industrial networking.

Performance Evaluation of MAC Layer of LnCP and LonWorks Protocol as Home Networking System

Recently, various home network systems, such as LonWorks, Echonet, and LnCP, etc., are developed to enhance customers comfort and convenience. However, it is not known that performance of any protocol is superior. Hence, this paper evaluates performance of LnCP (Living network Control Protocol) by LG Electronics and LonWorks by Echelon. For this purpose, we have developed simulation model using state diagram of LonWorks and LnCP, and simulation conditions through analysis of message to be generated in the smart home. Also, we evaluate performance, such as maximum transmission delay and mean transmission delay, of both protocols.

Traffic prediction of can network system with dual communication channels

The increasing number of electronic control units, sensors, and actuators in intelligent vehicles, and the increasing need for more intelligent functions require a network with increased capacity and real-time capability. As an example of enhancing the capacity of a controller area network (CAN) system, this paper presents a CAN system with dual communication channels as well as a traffic prediction method that predicts the traffic of each channel to allocates frames to the more appropriate channel. An experimental testbed using off-the-shelf microcontrollers with two CAN controllers was used to prove the feasibility of the traffic prediction method.