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20 results on '"Jaedoo Huh"'

1. Selection of Serving PNCs Based on Measured FER within IEEE 802.15.5 Wireless Mesh Network

Author

Eunchang Choi, Jaedoo Huh, Kwangsik Kim, and Mooho Cho

Subjects
Computer science, Low-power electronics, Clock rate, Real-time computing, Electronic engineering, Computer Science::Operating Systems, Real-time operating system, Electrical efficiency, Scaling, Scheduling (computing), Voltage, Dynamic voltage scaling
Abstract

Dynamic voltage scaling (DVS) is the scheduling algorithm that changes the operating clock frequency of the processor according to the supplied voltage. This is very effective method to improve the power efficiency of embedded systems which use operating system. In this paper, we apply dynamic voltage scaling scheme to scaling scheme of real-time operating system. This estimates the amount of the task which will executed next time slot, then adjust the supplying voltage and clock frequency to improve system performance.

Published
2007
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3. Power efficient wakeup mechanisms for wireless body area networks.

Author

Kwak, Kyungsup, Al Ameen, Moshaddique, and Jaedoo Huh

Abstract

The use of wireless sensors in healthcare has given rise to a new field called wireless body area networks (BAN). A sensor node used in a BAN has limited resources in terms of processing power, battery and memory. It is of outmost importance that the use of power is controlled in such a way that these nodes work longer. Media access control (MAC) layer directly involves with the transceiver which is the major source of power use. A common practice in MAC protocols to save power is to let the nodes sleep (switch off major components) whenever there is no need for communication. However, the major difference between them is the way the nodes wakeup to communicate. The wakeup mechanism is critical for network performance metrics such as power efficiency, delay, throughput and lifetime. Suitable wakeup mechanism can significantly improve the performance of MAC protocols for BAN. In this paper, we study the wakeup mechanisms in MAC protocol for BAN. [ABSTRACT FROM PUBLISHER]

Published
2012
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9. Managing Mechanism for Service Compatibility and Interaction Issues in Context-aware Ubiquitous Home.

Author

Seungho Baek, Hyunjeong Lee, Shinyoung Lim, and Jaedoo Huh

Subjects
ONLINE information services, INFORMATION services, COMPUTER architecture, COMPUTER input-output equipment, COMPUTER science, SYSTEMS development
Abstract

In this article, the intelligent home care system based on context-awareness consists of a sensor platform, a context-aware framework and an intelligent agent, where a sensor platform collects raw data and sends them to a context-aware framework, where perceives residents' and a home's context An intelligent agent triggers intelligent and automatic services according to the information based on situation of the context-aware framework. We design and implement an intelligent home care system based on the context-awareness technology, which minimizes residents' interventions and maximizes functional autonomy of systems. Also we suggest system architecture and its flows for the proposed system. In this article we discuss interaction issue about conflict and interference between various context information and service in the ubiquitous home environment Context information conflict arises in deciding service through various sensing information. Service interaction generated when service is applied in different controls at the same time for the same device. We focused on context-aware based service mechanism. [ABSTRACT FROM AUTHOR]

Published
2005
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