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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of information and communication convergence engineering
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Journal DOI :
The Korean Institute of Information and Commucation Engineering
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Volume & Issues
Volume 7, Issue 4 - Dec 2009
Volume 7, Issue 3 - Sep 2009
Volume 7, Issue 2 - Jun 2009
Volume 7, Issue 1 - Mar 2009
Selecting the target year
Network Accessibility and Data Transport Performance of Interworking Mobile Ad Hoc Networks
Lee, Kyou-Ho ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 241~246
Advances in mobile and wireless networking technologies have enabled mobile ad hoc networks applicable to a wide range of areas. Many cases of even such ad hoc networks demand to be accessible to the global network. Owing to be diversified in features depending on applications, however, some those networks may consist of devices or nodes which do not facilitate all the same transport protocols. This results in unreachable situations of establishing ad hoc network: such as non-existence of all required access points, faults or contention in a path of particular protocol communication. Interworking between different transport protocols can alleviate such problems. This paper proposes an interworking scheme to improve data transport performance and network accessibility, especially in such a mobile ad hoc network that is applicable to data communications among ships or user's convenient u-health services. Modeling and simulation analysis are used to verify the improvement.
Development of the Interactive Flexible Information System
Abishev, Olzhas ; Lee, Joon-Won ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 247~252
The Internet has made a huge impact on the way we, as humans, communicate. During the last decade a series of new communication mediums have emerged and communication protocols have come and gone. This puts new requirements on the development process and architecture of the communication platforms, operated by communities, in order to proactively ensure support for future communication protocols. Even further, additional requirements are added when the software itself will be maintained by a community. In this paper we explore the world of Open Source Software. We present our suggestions of usable design-principles and our process in developing a sustainable information system.
A Hybrid Service Orchestration Framework based on BPEL4WS
Kim, Sung-Min ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 253~257
As the value of B2B integration gets more importance and the business process becomes more complex, BPEL4WS standard has been focused for the solution of the problems which is based on web service technology. Many vendors implement the standard in their systems to integrate B2B and web service based inner-Enterprise Application(EA)s. But there is no way to use the standard to integrate non-web service based EAs, because the standard is designed only for Service Oriented Architecture (SOA) over web services. This paper proposes Hybrid Service Orchestration Framework to participate web services and also non-web service based EAs in the business process as a partner using BPEL4WS standard. The framework introduces Hybrid Service Architecture to represent non-web service based EAs as a service, so BPEL4WS could be used to integrate web services and non-web service based EAs. And the framework also introduces Hybrid Service Toolkit to support software level facilities. The paper also introduces Hybrid Orchestration System that is based on Hybrid Service Orchestration Framework.
Environmental Monitoring System for Base Station with Sensor Node Networks
Hur, Chung-Inn ; Kim, Hwan-Yong ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 258~262
A Practical application of environmental monitoring system based on wireless sensor node network with the core of embedded system STR711FR2 microprocessor is presented in the paper. The adaptable and classifiable wireless sensor node network is used to achieve the data acquisition and multi-hop wireless communication of parameters of the monitoring base station environment including repeaters. The structure of the system is proposed and the hardware architecture of the system is designed, and the system operating procedures is proposed. As a result of field test, designed hardware platform operated with 50kbps bit rate and 5MHz channel spacing at 2040Hz. The wireless monitoring system can be managed and swiftly retreated without support of base station environmental monitoring.
Mode Identification in the Design of Wideband Cylindrical Monopole Antenna
Chun, Joong-Chang ; Kim, Sang-Youl ; Jeung, Deuk-Soo ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 263~267
Cylindrical monopole antenna is one of most promising candidates for multi-band applications such as PCS, WLAN, DMB, and UWB wireless services. In this research, we demonstrate that there exist two types of current distributions according to the exciting frequency in a double band cylindrical monopole antenna, in which double resonance is achieved by adjusting the coupling structure of the antenna base. The operating modes of current distributions are identified from CST software simulations, the standing wave mode in a lower band and the traveling wave mode in a higher band. Also it is noticed that the mode behavior is quite similar to a helical antenna, a standing-wave (resonance) mode and a traveling-wave (non-resonance) mode according to the electrical dimensions of antenna. The effective ranges for operating modes and design formulas of the double band antenna are derived from simulation and measured results.
A Study on Sensitivity Analysis by Fuzzy Inference Rules Using Color and Location Information
Kim, Kwang-Baek ; Woo, Young-Woon ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 268~274
Human beings can represent state of mind such as psychological state, personality or emotional trouble by the pictures painted on one's own initiative. But in general, it is hard to understand a consulter's unconscious state through one's objective and intentional descriptions only. So one's psychological state and emotional trouble can be understood and cured by color and location information of objects drawn in one's picture. By this reason, a consultant can help and settle a consulter's growth stages of life and emotional trouble through treatment by pictures. In this paper, we proposed a method to find out state of sensitivity by analysis of color and location information represented in a picture and fuzzy inference rules. We applied the proposed method to the states of sensitivity from color information proposed by Alschuler and Hattwick and the psychological states from location information proposed by Grunwald. In the experimental results by the two applications, we verified the proposed sensitivity analysis method is efficient.
A Study on the DB-IR Integration: Per-Document Basis Online Index Maintenance
Jin, Du-Seok ; Jung, Hoe-Kyung ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 275~280
While database(DB) and information retrieval(IR) have been developed independently, there have been emerging requirements that both data management and efficient text retrieval should be supported simultaneously in an information system such as health care, customer support, XML data management, and digital libraries. The great divide between DB and IR has caused different manners in index maintenance for newly arriving documents. While DB has extended its SQL layer to cope with text fields due to lack of intact mechanism to build IR-like index, IR usually treats a block of new documents as a logical unit of index maintenance since it has no concept of integrity constraint. However, In the DB-IR integrations, a transaction on adding or updating a document should include maintenance of the posting lists accompanied by the document. Although DB-IR integration has been budded in the research filed, the issue will remain difficult and rewarding areas for a while. One of the primary reasons is lack of efficient online transactional index maintenance. In this paper, performance of a few strategies for per-document basis transactional index maintenance - direct index update, pulsing auxiliary index and posting segmentation index - will be evaluated. The result shows that the pulsing auxiliary strategy and posting segmentation indexing scheme, can be a challenging candidates for text field indexing in DB-IR integration.
A development of map building sensor system for mobile robot using low cost photo sensor
Hyun, Woong-Keun ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 281~285
Mobile robot has various sensors for describing the external world. The ultrasonic sensor widely applied to the most mobile robot to detect the obstacle and environment owing to low cost, its easy to use. However, ultrasonic sensor has major problems: the uncertainty information of sensor, false readings caused by specular reflection, multi path effect, low angular resolution and sensitivity to changes in temperature and humidity. This paper describes a sensor system for map building of mobile robot. It was made of low cost PSD (Position Sensitive Detector) sensor array and high speed RISC MPU. PSD sensor is cost effective and light weighting but its output signal has many noises. We propose heuristic S/W filter to effectively remove these noises. The developed map building sensor system was equipped on a mobile robot and was compared with ultrasonic sensor through field test.
On the Performance of Multi-User 2PPM-TH-UWB SIMO Systems in Multipath Channels
Baek, Sun-Young ; Kang, Yun-Jeong ; Kim, Sang-Choon ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 286~291
In this paper, the performance of ultra-wideband (UWB) single input multiple output (SIMO) systems to achieve high data rate communications is studied in dense multipath environments. The effects of spatial and temporal diversities on the performance of multi-user time-hopping UWB systems using binary pulse position modulation (2PPM) are analyzed. The reduced-complexity Rake receivers based on the selective combining (called SRake) and partial combining (called PRake) are considered. The theoretical and simulation results show that the BER performance of the UWB system can be enhanced as the number of array elements and/or Rake fingers increases. Moreover, we observe that SRake is more effective for the IR-UWB systems to achieve a good BER performance, as compared with PRake.
Anti-collision Algorithm with Early Cancellation of Query Round in RFID Systems
Lim, In-Taek ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 292~296
The performance of anti-collision algorithm in RFID systems, which are based on FSA algorithm, may be affected by the frame size a query round. In this paper, an anti-collision algorithm with early cancellation of query round is proposed to enhance the performance of EPCglobal Class-1 Gen-2. The Q-algorithm calculates a Q value to determine the next frame size during a query round. In the proposed algorithm, if the new Q value is different from the previous one, the reader transmits a QueryAdjust command to cancel the current query round. The simulation results show that the proposed algorithm can have a stable performance irrespective of the C value of Q-algorithm and the number of tags.
Standalone Maritime Aids-To-Navigation AIS Mobile Station
Lee, Chee-Cheong ; Park, Soo-Hong ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 297~303
Automatic Identification System (AIS) is a VHF radio broadcasting system where transmits packets of data via VHF data link. It enables vessels and coastal-based station that equipped with AIS equipment to send and receive useful information. This information can be help in situational awareness and provide a means to assist in collision avoidance. In addition, AIS can be use as Aid-To-Navigation, by providing the location and additional information on buoys and lights. Besides, it can also contain details information in meteorological status of a particular ship location. This paper presents the standalone AIS system that able to receive and report own ship location, meteorological data collection and broadcast safety related information if necessary. With the unique ship's MMSI number, all the information of that particular ship can be monitor by using AIS program written in C++ programming language.
Signal Space Representation of Half-Symbol-Rate-Carrier PSK Modulations
Yeo, Hyeop-Goo ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 304~308
This paper proposes a new concept of a signal constellation of the recently introduced half-symbol-rate-carrier phase-shift keying (HSRC-PSK) modulations for bandwidth-efficient high speed data communications. Since the HSRC-PSK modulations contain different symbol energies representing the same bit sequences due to the loss of orthogonality of their HSRC signals, it is very hard to represent the symbol using the conventional signal constellation. To resolve the problem, two different energies are assigned to represent one symbol for the HSRC offset quadrature phase shift keying (OQPSK) modulation. Similarly, the different energies exist to display the different symbol for HSRC minimum shift keying (MSK) modulation. With the proposed signal space representation, HSRC-PSK symbol can easily be shown with a two-dimensional scatter plot which provides helpful information of evaluating HSRC-PSK signal's quality.
End-to-End Performance of VoIP based on Mobility Pattern over MANETs
Kim, Young-Dong ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 309~313
In this paper, end-to-end VoIP(Voice over Internet Protocol) performance is evaluated by simulation with NS-2 simulation tool. There are many results studied and published for VoIP performance over TCP/IP networks. But, almost all of them were focused on wired or wireless Internet environments. About MANET (Mobile Ad Hoc Network), VoIP is currently studying several points of research. In this paper, analysis of VoIP performance is done with focusing on the mobility of MANETs. MOS(Mean Opinion Score), network delay, packet loss rates are considered as end-to-end QoS performance parameters.
Design of Multiband Maritime Network for Ships and its Applications
Yun, Chang-Ho ; Cho, A-Ra ; Kim, Seung-Geun ; Park, Jong-Won ; Lim, Yong-Kon ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 314~322
Nowadays, maritime communication systems need high data rate, reliability, and consistency in order to equivalently provide navigating ships with diverse multimedia services as in terrestrial communication systems. For this purpose, we conceptualize and design the maritime network for ships equipped with a multiband communication system which cost-effectively supports multimedia services according to several radiofrequency bands, such as HF, VHF, and satellite frequencies. We also introduce two service scenarios targeted for the maritime network; ship multimedia service (SMS) and real-time maritime logistics location tracking (RML2T). In addition, we specify related works according to three lower network layers (i.e., physical, data-link, and network layers) upon designing the network.
Improved dynamic range of the camera image by using double-exposure image processing method for mobile phone cameras
Jang, Won-Woo ; Kwak, Boo-Dong ; Ha, Joo-Young ; Kang, Bong-Soon ; Lee, Gi-Dong ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 323~329
In this paper, we propose the improvement method of the camera images regardless of exposure environments. By using a double-exposure method, we could improve camera images with clear recognition. We applied the improvement method on the mobile phone. For the feasibility of the proposed algorithm, we compared simulated camera images with the proposed method to conventional images by using auto-exposure image. Experimental results are also shown in this paper.
A Security Framework for Ubiquitous Computing Environment
Chae, Cheol-Joo ; Shin, Hyo-Young ; Lee, Jae-Kwang ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 330~334
Most security solutions and middleware on home network consider internet users as approaching subject. It is unrealistic where the most subjects are mobile users who want to control home network devices. Therefore minor and fast certification structures are needed to control other devices with mobile device that has lower computing capacity. To solve the above problems, this paper wants to build safe certification frame work for internet and mobile users to control household devices safely. New certification structure is proposed to get out of heavy certification structure like PKI and to minimize encrypting and decrypting operation by compounding session key and public key.
Analyses of Security Issues and Requirements for RFID System and Its Application
Kim, Jung-Te ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 335~339
RFID security and privacy issues have been intensively studied in the research field, the authentication between RFID reader and tag is the fundamental them. Most of the existing authentication protocols draw assumptions on classic primitives. Since tags have small capacities, the security mechanisms which are in use in computer networks and communication are not suitable. In this paper, we compare and analyze recent technical research on the problems of privacy and security. It consists of security mechanism, threats and performance evaluation, etc.
Cryptanalysis of Hu-Niu-Yang's Multi-server Password Authenticated Key Agreement Schemes Using Smart Card
Lee, Sang-Gon ; Lim, Meng-Hui ; Lee, Hoon-Jae ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 340~344
Multi-server password authentication schemes enable remote users to obtain service from multiple servers with single password without separately registering to each server. In 2007, Hu-Niu-Yang proposed an improved efficient password authenticated key agreement scheme for multi-server architecture based on Chang-Lee's scheme proposed in 2004. This scheme is claimed to be more efficient and is able to overcome a few existing deficiencies in Chang-Lee's scheme. However, we find false claim of forward secrecy property and some potential threats such as offline dictionary attack, key-compromise attack, and poor reparability in their scheme. In this paper, we will discuss these issues in depth.
Character based Hangeul search using Location-specific Character Frequency
Lee, Jung-Hwa ; Lee, Jong-Min ; Kim, Seong-Woo ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 345~350
Hangul search functionality, including dictionary search is used in many Hangeul applications. Existing research of hangeul search method is the study of using hangeul syllable as a basic unit. However when you consider the characteristics of Hangul, the research of using hangeul character as a basic unit is needed. In this paper we propose the character based hangeul search method using the location-specific frequency information and verify the effectiveness of the proposed method through the experiments.
E-mail Classification and Category Re-organization using Dynamic Category Hierarchy and PCA
Park, Sun ; Kim, Chul-Won ; An, Dong-Un ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 351~355
The amount of incoming e-mails is increasing rapidly due to the wide usage of Internet. We often group e-mails into categories for maintaining e-mail efficiently. However reading the email messages and classifying them is still tedious task. Moreover, the number of e-mails and manual classifying is increasing everyday. So, automatic e-mail classification is important techniques. In this paper, we propose a multi-way e-mail classification method that uses PCA for automatic category generation and dynamic category hierarchy for re-organizing e-mail categories. It classifies a huge amount of receiving e-mail messages automatically, efficiently, and accurately.
Nominal States Relationship and Its Sliding Mode Control Application
Kim, Min-Chan ; Ko, Chang-Min ; Park, Seung-Kyu ; Kwak, Gun-Pyong ; Yoon, Tae-Sung ; Ahn, Ho-Kyun ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 356~360
A novel method to derive a Nominal States Relationship (NSR) of a control system is proposed. The obtained relationship is used to design a sliding surface which can have the characteristic of a nominal system. With this sliding surface, a Sliding Mode Control (SMC) system which has the characteristics of the nominal system controlled by pole placement is designed for an uncertain system.
Analysis of Transport Characteristics for FinFET Using Three Dimension Poisson's Equation
Jung, Hak-Kee ; Han, Ji-Hyeong ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 361~365
This paper has been presented the transport characteristics of FinFET using the analytical potential model based on the Poisson's equation in subthreshold and threshold region. The threshold voltage is the most important factor of device design since threshold voltage decides ON/OFF of transistor. We have investigated the variations of threshold voltage and drain induced barrier lowing according to the variation of geometry such as the length, width and thickness of channel. The analytical potential model derived from the three dimensional Poisson's equation has been used since the channel electrostatics under threshold and subthreshold region is governed by the Poisson's equation. The appropriate boundary conditions for source/drain and gates has been also used to solve analytically the three dimensional Poisson's equation. Since the model is validated by comparing with the three dimensional numerical simulation, the subthreshold current is derived from this potential model. The threshold voltage is obtained from calculating the front gate bias when the drain current is
Moving Target Position Detecting System using Dual Line CCD and Photometric Interpolation
Ryu, Kwang-Ryol ; Kim, Young-Bin ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 366~371
A realization for an accurate position detecting system of a moving target in two dimensional plane using dual line CCDs and photometric interpolation is presented. The system is realized that the infrared LEDs are utilized for lighting source, a target size is recognized by the scanned data from CCD owing to blocking the radiated light path by placing the target between CCD and lighting source, a coordinate on the plane is found by plane trigonometry formed by the moving target and two CCD sensors, and the former scan data is used for the coordinate iteratively and the photometric interpolation is applied to sub-pixel of scanned image. The experimental results show that the experiment results in a success rate about 3 different size targets, 3, 5 and 7mmm on the test plane
. The moving target positioning detected success rate is 93% in 3mm target, 5mm is 95.3%, and 7mm is 95.8% respectively. The photometric interpolation is enhanced to 1.5% in comparison to be unused.
Dispersion Managed Optical Transmission Links with Optimized Optical Phase Conjugator
Lee, Seong-Real ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 372~376
In this paper, new and simple optical transmission link with fixed dispersion management (DM) scheme, i.e., pre(post) compensation and residual dispersion per span (RDPS) are fixed to net residual dispersion (NRD) = 0 ps/nm, and optical phase conjugator (OPC) having optimal position depending on launch power in WDM transmission system is proposed. Also, effective launch power range of WDM channels resulting 1 dB eye opening penalty (EOP) is induced as a function of OPC position. First, it is confirmed that, for applying DM into WDM transmission link fixed pre(post)compensation and RDPS, which are independence on exact system parameters except launch power, sufficiently are used in WDM links, but OPC with optimal position is needed for effective compensating impairments of WDM channels. And, it is confirmed that effective launch power is broader in case of RDPS = 100 ps/nm than in RDPS = 50 ps/nm. But, it is shown that the best OPC position offset is -0.6 km from a point of view of power window, which is defined as difference between maximum and minimum effective launch power.
Performance Analysis of Chained Amplifier Systems for Metropolitan Optical Network Applications
Lee, Jong-Hyung ; Choi, Byeong-Yoon ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 377~382
In this paper, theoretical analysis for metropolitan optical networks is performed. First, analytical optical SNR is derived assuming each node consists of an EDFA, an optical filter, an optical switch, and a VOA, and then the relationship between OSNR and BER is studied. In a metropolitan optical network, an optical signal can be dropped to deliver data, and we also studied the effect of drop loss on system performance. When the drop loss is relatively small, the receiver structure of the node can be treated as a preamplifier receiver which is widely used in long-haul systems. In that case, ASE noise from EDFAs is the dominant noise source in the receiver. However, system performance is relatively insensitive to OSNR when the drop loss is significant because of the noise sources in the receiver (thermal and shot noise).
Blind linear/nonlinear equalization for heavy noise-corrupted channels
Han, Soo- Whan ; Park, Sung-Dae ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 383~391
In this paper, blind equalization using a modified Fuzzy C-Means algorithm with Gaussian Weights (MFCM_GW) is attempted to the heavy noise-corrupted channels. The proposed algorithm can deal with both of linear and nonlinear channels, because it searches for the optimal channel output states of a channel instead of estimating the channel parameters in a direct manner. In contrast to the common Euclidean distance in Fuzzy C-Means (FCM), the use of the Bayesian likelihood fitness function and the Gaussian weighted partition matrix is exploited in its search procedure. The selected channel states by MFCM_GW are always close to the optimal set of a channel even the additive white Gaussian noise (AWGN) is heavily corrupted in it. Simulation studies demonstrate that the performance of the proposed method is relatively superior to existing genetic algorithm (GA) and conventional FCM based methods in terms of accuracy and speed.
Performance Improvement in Alternate Mainbeam Nulling by Adaptive Estimation of Convergence Parameters in Linearly Constrained Adaptive Arrays
Chang, Byong-Kun ; Jeon, Chang-Dae ; Song, Dong-Hyuk ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 392~398
A novel approach is presented to improve the array performance of the alternate mainbeam nulling in a linearly constrained adaptive array processor in coherent environment. The convergence parameters in the linearly constrained LMS algorithm with a unit gain constraint and a null constraint in the direction of the desired signal are adaptively estimated to reduce the error power between the desired signal and the array output in the 2-dimensional convergence parameter space. It is shown that the case for estimating the convergence parameter for the unit gain constraint with that for null constraint fixed performs best. Also, it is observed that the proposed method performs significantly better than conventional methods as the number of coherent interferences increases.
HW/SW Co-Design of an Adaptive Frequency Decision in the Bluetooth Wireless Network
Moon, Sang-Ook ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 399~403
In IEEE 802.15.1 (Bluetooth) Ad-hoc networks, the frequency is resolved by the specific part of the digits of the Device clock and the Bluetooth address of the Master device in a given piconet. The piconet performs a fast frequency hopping scheme over 79 carriers of 1-MHz bandwidth. Since there is no coordination between different piconets, packet collisions may occur if two piconets are located near one another. In this paper, we proposed a software/hardware co-design of an adaptive frequency decision mechanism so that more than two different kinds of wireless devices can stay connected without frequency collision. Suggested method was implemented with C program and HDL (Hardware Description Language) and automatically synthesized and laid out. The adaptive frequency hopping circuit was implemented in a prototype and showed its operation at 24MHz correctly.
Improvement of Channel Estimation Algorithm in Mobile/Satellite Communication Systems
Kim, Byung-Gi ; Ryoo, Sang-Jin ; Lee, Chang-Hun ; Choi, Kwang-Seok ; Kim, Seong-Hwan ; Kang, Seong-Jun ; Na, Cheol-Hun ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 404~411
In this paper, in order to increase system capacity and reduce the transmitting power of the user's equipment, we propose an efficient power estimation consisting of a modified open-loop power control (OLPC) and closed-loop power control (CLPC) schemes for mobile/satellite communications systems. The OLPC works well if the forward and reverse links are perfectly correlated and the CLPC is sensitive to round-trip delay (RTD). Therefore, it is not effective in mobile/satellite system. In order to solve the above problem, we added monitoring equipment to both the OLPC and CLPC to use information about transmitting power that has not yet been received by the receiver over the satellite/ATC channel. Moreover, we adapted an efficient pilot diversity of both OLPC and CLPC in order to get a better signal to interference plus noise ratio (SIR) estimation of the received signal.
An U-Healthcare Implementation for Diabetes Patient based on Context Awareness
Kim, Jeong-Won ;
Journal of information and communication convergence engineering, volume 7, issue 3, 2009, Pages 412~417
With ubiquitous computing aid, it can improve human being's life quality if all people have more convenient medical service under pervasive computing environment. In this paper, for a pervasive health care application for diabetes patient, we've implemented a health care system, which is composed of three parts. Various sensors monitor both outer and inner environment of human such as temperature, blood pressure, pulse, and glycemic index, etc. These sensors form zigbee-based sensor network. And as a backend, medical information server accumulates sensing data and performs back-end processing. To simply transfer these sensing values to a medical team may be a low level's medical service. So, we've designed a model with context awareness for more improved medical service which is based on ART(adaptive resonance theory) neural network. Our experiments show that a proposed healthcare system can provide improved medical service because it can recognize current context of patient more concretely.