Surgwon Sohn

Surgwon Sohn
Hoseo University · Division of Computer and Information Engineering

About

29
Publications
1,167
Reads
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87
Citations
Citations since 2016
3 Research Items
17 Citations
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20162017201820192020202120220123456
20162017201820192020202120220123456

Publications

Publications (29)
Article
Full-text available
This paper presents a modal parameter estimation of a cantilevered steel beam using low-cost wireless accelerometers for structural health monitoring. To demonstrate the feasibility of using wireless accelerometers, the frequency response functions (FRFs) for the beam are measured. A curve-fitting algorithm is then applied to extract the modal para...
Article
Low-cost wireless sensor nodes have become more important in the area of modern structural health monitoring (SHM) the power consumption and cost of the wireless sensor nodes play an important role in the development of modern SHM. This paper presents a low-cost wireless vibration measurement method using wireless sensor nodes. To improve the quali...
Article
In this paper, we propose a design of microwave motion detector using X-band doppler radar sensor to minimize the power consumption. To minimize the power consumption and implement battery operated system, pulse input with 2 KHz, 4% duty cycle is exerted on the doppler radar sensor. In order to simplify the process of working with ATmega2560 microc...
Article
This paper presents a simple design and implementation of a transducer interface agent. The agent communicates with a middleware for wireless sensor networks, and can be installed on the PC or any small gateway devices. The agent's chief end is to replace the network capable application processor (NCAP) and wireless transducer interface module (WTI...
Article
This paper presents a constraint satisfaction approach to the reader collision problem in dense mode environments for static RFID networks. Our method assigns available channels and time slots to the RFID readers to increase the read rate while satisfying all the interference constraints. We model the problem with a hybrid frequency and time divisi...
Article
Reader-to-reader interference in RFID system is occurred due to the use of limited number of frequencies, and this is the main cause of read rate reduction in the passive RFID tags. Therefore, in order to maximize the read rate under the circumstances of limited frequency resources, it is necessary to minimize the frequency interference among RFID...
Chapter
This paper presents graph coloring algorithms and their applications to the channel assignment problems. Two application problems of frequency assignment of low power FM broadcasting and reader collision problem of RFID system are modeled as graph coloring problems. Instead of performing an exhaustive search for the optimal result, we provide both...
Article
The technologies of image acquisition, display, and storage of the breast have been developed in their specialized fields in recent years. The image acquisition system is a device that absorbs and stores images after examining breast tissue using X-ray. Due to the specificity and sensitivity of imaging, the early detection of breast cancer is feasi...
Article
This paper describes a design and application of middleware that is essential to the context-aware system. We define a transducer interface protocol in order to deal with a variety of context data. For the purpose of systematic process of data between middleware modules, a message oriented middleware is designed and implemented. Memory improves the...
Article
Context awareness technologies are based on efficient sharing of environment information of ubiquitous sensors in everyday life, and users require this awareness technologies to get quality of services. However, the application has been restricted due to its varieties of sensors and many different methods of communications. Therefore, IEEE 1451 sta...
Article
This paper proposes a constraint satisfaction optimization model and algorithms for the RFID reader interference problem. Interference minimization of RFID readers is first modeled as a graphcoloring problem, and the problem is then modeled using constraint satisfaction optimization. Instead of performing an exhaustive search for optimal results, w...
Article
It is very hard to obtain a general algorithm for solution of all the constraint satisfaction optimization problems. However, if the whole problem is separated into subproblems by characteristics of decision variables, we can assume that an algorithm to obtain solutions of these subproblems is easier. Under the assumption, we propose a problem clas...
Article
Efficient ordering of decision variables is one of the methods that find solutions quickly in the depth first search using backtracking. At this time, development of variables ordering algorithms considering dynamic and static properties of the problems is very important. However, to exploit optimal variable ordering algorithms appropriate to the p...
Article
In recent years, one of the common issues is an e-Health care system which makes available health management and medical services at any time and in any place. This study describes the development of an e-Health care system that can promptly detect and cope with emergent situations happening to chronic disease patients in their everyday life. If a...
Article
In this paper, we describe an ontology-based context aware model that collects context information from USN sensor and CCTV image and reasons about context in order to development an integrated security control system in the industrial environments. The context model represents autonomous and heterogeneous data as ontologies and recognizes the cont...
Article
The success of semantic web depends largely on the semantic annotation which systematizes knowledge for the construction and production of ontology. Therefore, the efficiency of semantic annotation is very important in order to change many knowledge expressions and generate into ontology instances. In this paper, we presents a generation system of...
Article
This paper describes an information system of operation adequacy in environmental facilities such as environmental contamination prevention and processing equipments, which is namely, an integrated management system for environmental facilities. By developing this system, we can improve environmental characteristics and maximize the efficiency thro...
Article
The Relay node placement problem is one of the most important requirements for many wireless sensor networks because the lifetime of sensor networks is closely related with the placement of relay nodes which receive sensed data from sensor nodes and forward them to the base station. Relay node placement problem has focused at minimization of dissip...
Article
As one of the most important requirements for wireless sensor networks, prolonging network lifetime can be realized by minimizing energy consumption in cluster heads as well as sensor nodes. While most of the previous researches have focused on the energy of sensor nodes, we devote our attention to cluster heads because they are most dominant sourc...
Article
Full-text available
In digital broadcasting, it is possible to multiplex maximum one hundred audio or music programs into MPEG-2 transport stream, which is suitable for transmitting through one channel. In order to check if multiplex music programs are transmitted well, we need a multiplex audio monitoring system that monitors the programs in real-time. In analog broa...
Article
Full-text available
The terrestrial DMB receivers and their application products need many tests such as normal reception, reception state for the noisy environment, reception state changes due to the changes of output power of the DMB signal, and reception state of various environment. Therefore, the real-time simulation system of the terrestrial DMB broadcasting sys...
Conference Paper
The present study discusses the construction of a ubiquitous health care system that can cope actively with urgent situations of chronic disease patients who can lead everyday life despite their chronic diseases. If a patient's emergency is detected by personal health care host (PHCH), which is composed of USN, electronic stethoscope, GPS, CDMA and...
Conference Paper
We present an algorithm to solve the frequency assignment problem for low power FM broadcasting. To get a good suboptimal solution, some heuristics such as k-coloring variable ordering and mostly-used value ordering rule are provided. They enforce the backtracking process in a constraint satisfaction problem, so both the search space and computing...
Conference Paper
Cell planning is a very complex task because many aspects should be taken into account including the traffic distribution, geography, antenna height of base stations, frequency, and so forth. This becomes more complicated when several constraints are considered such as the quality of service, maximum output power of transmitters, types of power con...
Conference Paper
Cell planning is a very complex task because many aspects should be taken into account including the traffic distribution, geography, antenna height of base stations, frequency, and so forth. This becomes more complicated when several constraints are considered such as the quality of service, maximum output power of transmitters, types of power con...
Conference Paper
Full-text available
This article considers a power control algorithm for cellular communications systems in which a user's link (dB) quality objective, as measured by the signal to interference ratio (SIR), varies with its transmitter power. In particular, as increased interference or reduced uplink gain leads a mobile to raise its transmitter power, that mobile lower...

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