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John Paul M. Torregoza,Won-Joo Hwang 한국멀티미디어학회 2008 한국멀티미디어학회 학술발표논문집 Vol.2008 No.1
Of the papers written that analyze the capacity region for spatial diversified Wireless Mesh Networks (WMNs), few give emphasis on the tiered architecture for WMNs. In reality, the capacity of each tier behaves in a different way and this facts affect the capacity region. In addition to this, the use of directional antennas for spatial diversity requires us to consider power control and location awareness as factors that would affect capacity region analysis. This paper analyzes the capacity region of spatial diversified WMNs by extending works done for general wireless mesh networks to include power control and location-awareness. From the results of this paper, we can show the effect of power control and location awareness in analyzing the capacity of WMNs. Also, the contributions of the router tier and client tier in the capacity utilization is quantized into separate entities.
John Paul M. Torregoza,Won-Joo Hwang 한국멀티미디어학회 2006 한국멀티미디어학회 학술발표논문집 Vol.2006 No.2
Wireless Mesh Networks is a decentralized networking technology that is currently being adapted to connect peer-to-peer clients and large-scale backbone networks. Nodes are designed to act as repeaters allowing communication or very large distances. Robustness is another characteristic of wireless mesh networks, partly due to its decentralized nature which removes a central point of failure. Due to its complex nature, a number of issues are still under research. Broadband communication such as WLAN and UWB are ideal for transmission of mesh data due to their high speed. Researches in the PHY layer have come up with using Multi-channel and multi-transceiver technology is being studied to improve the capacity of mesh networks. Routing protocols are also a vital research in mesh networks. Distributed routing is needed which can find the optimized path in a widely decentralized mesh network. Also, with the implementation of new PHY technology, existing routing protocols need to be revised to exploit the advantages of new the new PHY. This paper aims to improve existing protocols for wireless mesh networks and wireless adhoc networks in order to take advantage of the properties of multi-channel technology.
RENEWABLE ENERGY SOURCE LIFE ESTIMATION MODEL FOR SENSOR NETWORKS
John Paul M. Torregoza,Won-Joo Hwang 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
Sensor applications are gaining popularity in health applications particularly in environmental monitoring and patient monitoring. Some applications include monitoring of CO₂ concentration in home environment, pulse monitoring for in-house patients, and monitoring of medicine distribution in hospitals. Sensors can be deployed in the target environment or in some cases, worn by the monitored patient. Data from these deployed sensor are then stored in a database for future analysis by medical professionals. Reliability and accuracy of data is considered for medical application. This paper presents a simple model for renewable energy source in the deployed sensors. This model can then be used as cost function for providing efficient routing and good quality of service.
Primary and Secondary User Bandwidth Sharing Model Using Cournot Game
Khanh-Huy Nguyen,John Paul M. Torregoza,Won-Joo Hwang 한국멀티미디어학회 2010 한국멀티미디어학회 학술발표논문집 Vol.2010 No.2
Efficient spectrum assignment for primary and secondary users is a challenge due to the requirement of harmonious coexistence of both users. In this paper, we determine the amount of available bandwidth that can be shared to secondary users. We use Cournot game to model this problem as an oligopoly market competition to achieve maximal profit. The iterative algorithm can be utilized to find the Nash equilibrium. Simulation shows that the algorithm converges to the optimal solution.
Bui Dang Quang,John Paul M. Torregoza,Hwang Won-Joo 한국멀티미디어학회 2007 멀티미디어학회논문지 Vol.10 No.6
As we go about our daily lives, people often collect surrounding information and adapt to the situation. Computer development trends show that one wants computers to work like human beings, i.e. computers can sense its context and adapt corresponding to context changes. To implement this expectation, a context aware service layer is needed. In this layer, sensors capture its environment and send this information to the service center. Considering received information as its context, the service center seeks the suitable operation according to the context. This paper presents a context aware service which is applied in controlling air-conditioner. The air-conditioner includes sensors which are installed at some special positions in a room. Each of these sensors gathers comfort-influenced information like temperature, humidity and sends them to air-conditioner. The air-conditioner adapts its operation to the environment according to the sensed information. To control the air-conditioner effectively, we use a genetic algorithm which is suitable in adaptation issues. The simulation shows that the room condition can be maintained at a comfortable level by using context-aware services in the operation of the air-conditioning system.