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pISSN : 1598-849X / eISSN : 2383-9945

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2011, Vol.16, No.5

  • 1.

    Hardware Design and Implementation of a Parallel Processor for High-Performance Multimedia Processing

    김용민 , 황철희 , 김철홍 and 1 other persons | 2011, 16(5) | pp.1~12 | number of Cited : 2
    Abstract PDF
    As the use of mobile multimedia devices is increasing in the recent year, the needs for high-performance multimedia processors are increasing. In this regard, we propose a SIMD (Single Instruction Multiple Data) based parallel processor that supports high-performance multimedia applications with low energy consumption. The proposed parallel processor consists of 16 processing elements (PEs) and operates on a 3-stage pipelining. Experimental results indicated that the proposed parallel processor outperforms conventional parallel processors in terms of performance. In addition, our proposed parallel processor outperforms commercial high-performance TI C6416 DSP in terms of performance (1.4-31.4x better) and energy efficiency (5.9-8.1x better) with same 130nm technology and 720 clock frequency. The proposed parallel processor was developed with verilog HDL and verified with a FPGA prototype system.
  • 2.

    A Hardware Architecture of Regular Expression Pattern Matching for Deep Packet Inspection

    윤상균 , 이규희 | 2011, 16(5) | pp.13~22 | number of Cited : 2
    Abstract PDF
    Network Intrusion Detection Systems use regular expression to represent malicious packets and hardware-based pattern matching is required for fast deep packet inspection. Although hardware architectures for implementing constraint repetition operators such as {10} were recently proposed, they have some limitation. In this paper, we propose hardware architecture supporting constraint repetitions of general regular expression sub-patterns with lower logic complexity. The subpatterns supported by the proposed contraint repetition architecture include general regular expression patterns as well as a single character and fixed length patterns. With the proposed building block, we can implement more efficiently regular expression pattern matching hardwares.
  • 3.

    Implementation of the Hibernation-based Boot Mechanism on an Embedded Linux System

    도인환 | 2011, 16(5) | pp.23~32 | number of Cited : 2
    Abstract PDF
    Improving system boot time has become one of the most important issues in the system software arena. As Linux is widely used in the embedded system environment, extensive research has been conducted in order to mitigate Linux boot time delay. In this respect, this paper mainly focuses on the Hibernation-based boot mechanism, which is the boot mechanism based on Hibernation, as an alternative to the conventional boot sequence. The contributions of this work are as follows. First, we implement the Hibernation-based boot mechanism on a real embedded Linux system and describe the implementation details. Second, we observe the Hibernation-based boot procedures so that we can investigate the possibility whether the boot mechanism has room for improvement in terms of the boot time. Through the in-depth observation and analysis based on the real implementation, we anticipate that the Hibernation-based boot mechanism which adopts various optimization methods can provide maximum of 3.1 times faster booting performance compared to the conventional way.
  • 4.

    A Evaluation System for Preference based on Multi-Emotion

    Lee,Ki-Young , Lim Keun , Kim,Kyu-Ho and 1 other persons | 2011, 16(5) | pp.33~40 | number of Cited : 0
    Abstract PDF
    In modern society, in business decisions of our customers are continually increasing in importance, and owing to the development of information and communication technology effectively on a computer to measure the preferences of key customer techniques are being studied. However, this preference reflects significantly on personal ideas, and therefore, it is difficult to commercialize a measure calculated according to the ambiguous results. In this paper, by using biometric information that has been measure; we have configured the multi-sensitivity models based on customer preferences to evaluate the proposed system. This system consists of multiple biometric information of multi-dimensional vector model for learning through the use of structured emotional to apply the same criteria to evaluate customer preferences. In addition, by studying the specific subject-specific emotion model, it is shown to improve accuracy with further experiments.
  • 5.

    Mobile Contents for Learning of English Presentation based on Android Platform

    Park, Seongwon , Oh Duk Shin | 2011, 16(5) | pp.41~50 | number of Cited : 6
    Abstract PDF
    In this study, we developed mobile contents and mobile learning system for learning of english presentation based on Android platform. First, the application including contents transfer system which enables contents run on Android platform was developed for learning of English presentation. Second, presentation contents which will be applied on the application were manufactured. The contents developed in this study are for learning English presentations. The contents are classified into two parts; Part 1 is for basic English presentations, and Part 2 is for advanced English presentations. Each part is made up with 9 units, and each unit is composed differently by topics. The number of whole chapter for both parts is 51. We analyzed the questionnaire responses with respect to UI satisfaction and satisfaction of the learning experience. The UI satisfaction results showed that 85% of the participants were satisfied at an ordinary or higher level with our system. And The satisfaction of the learning experience results showed that 95% of the participants were satisfied at the ordinary or higher level with our system.
  • 6.

    A Return-on-Investment Analysis for evaluating Effectiveness of Corporate e-Learning Programs

    HyunKyung Lee , Myung-geun Lee , Yoon Hee Kim | 2011, 16(5) | pp.51~60 | number of Cited : 0
    Abstract PDF
    The study explored a way to analyze return-on-investment for evaluating corporate e-learning programs. It is said to be not easy to measure return-on-investment due to complexity of determining exact amount of cost and benefit of any e-learning program. In this vein, it has been rare to see researches regarding return-on-investment for corporate e-learning programs. Nevertheless, it is needed to try to document return-on-investment evidence for verifying effectiveness of the programs. More concretely, the purpose of the study is to draw up guidelines in making decisions about whether companies should invest in e-learning programs any more at particular point of time.
  • 7.

    Development of the Inductive Proximity Sensor Module for Detection of Non-contact Vibration

    남시병 , Gun Jin Yun , 임수일 | 2011, 16(5) | pp.61~72 | number of Cited : 2
    Abstract PDF
    To measure the fatigue of metallic objects at high speed vibration while non-contact precision displacement measurement on how to have a lot of research conducted. Noncontact high-speed vibration detection sensor of the eddy current sensors and laser sensors are used, but it is very expensive. Recently, High-speed vibrations detection using an inexpensive inductive sensor to have been studied, but is still a beginner. In this paper, a new design of an inexpensive inductive proximity sensor has been suggested in order to measure high frequency dynamic displacements of metallic specimens in a noncontact manner. Detection of the existing inductive sensors, detection, integral, and amplified through a process to detect the displacement noise due to weak nature of analog circuits and integral factor in the process of displacement detection is slow. The proposed method could be less affected by noise, the analog receive and high-speed signal processing is a new way, because AD converter (Analog to Digital converter) without using the vibration frequency signals directly into digital signals are converted. In order to evaluate the sensing performance, The proposed sensor module using non-contact vibration signals were detected while shaker vibration frequencies from 30Hz to 1,100 Hz at intervals of vibrating metallic specimens. Experimental results, Vibration frequency detection range of the metallic specimins within close proximity to contactless 5mm could be measured from DC to 1,100Hz and vibration amplitude of the resolution was 20. Therefore, the proposed non-contact inductive sensor module for precision vibration detection sensor is estimated to have sufficient performance.
  • 8.

    A Countermeasure against Brute-force Attack using Digital Holography and DES Algorithm

    노창오 , 문인규 , Beom-Joon Cho | 2011, 16(5) | pp.73~78 | number of Cited : 0
    Abstract PDF
    The DES encryption algorithm employed in information security has a strong avalanche effect, and the processing speed to encrypt is also fast. However, due to the H/W advances, the secret key length of DES having 56bits is not enough so that it is easily exposed to brute force attack. In this paper, we present a new method to significantly increase the secret key length in the DES by integration of digital holography and DES algorithm. In addition, we evaluate the encryption performance of the proposed method by measuring the avalanche effect and verify the possibility of it.
  • 9.

    Construction and Validation of a Data Synchronization Server supporting OMA DS Standards

    박주건 , Park, KeeHyun | 2011, 16(5) | pp.79~92 | number of Cited : 0
    Abstract PDF
    In this paper, a DS (Data Synchronization) server for mobile communication environments is constructed and the suitability and the performance of its operations are validated. The DS server provides a way to update the newest data and keep data consistency for clients (mobile devices). In addition, the DS server constructed in this paper supports various synchronization types, and detects all changes and conflicts. In case of data conflicts, the DS server resolves the conflicts according to the several policies implemented in this work. The DS server conforms to the OMA(Open Mobile Alliance) DS standard protocol for interoperability with other mobile devices and servers. In addition to the transmission-by record scheme proposed by the OMA DS standard protocol, the DS server constructed in this paper also provides the transmission-by field scheme for the enhancement transmission performance between the server and clients. In order to validate its operations, data synchronization between the DS server and the SCTS (SyncML Conformance Test Suit), the suitability validation tool provided by the OMA, is performed. The validation results show that the DS server constructed in this paper satisfies all of the test cases except the Large Object function. The Large Object function will be implemented later because the function is not needed for the personal information synchronization process which this paper aims for. Also, synchronization times of the DS server are measured while increasing the number of data and clients. The results of the performance evaluations demonstrate that the DS server is scalable, in the sense that it has not suffered from any serious bottlenecks with respect to the number of data and clients. We expect that this work will provide a framework for various studies in the future for improving mobile DS operations.
  • 10.

    False Data Reduction Strategy for P2P Environment

    김승연 , Lee, Won Joo , Chang Ho Jeon | 2011, 16(5) | pp.93~100 | number of Cited : 0
    Abstract PDF
    In this paper, we propose a FDR(False Data Reduction) strategy for P2P environment that reduces false data. The key idea of our strategy is that we use FDR algorithm to stop transmitting of false data and to delete that. If a user recognizes false data in downloaded-data and the user's peer requests the others to stop the transmission of the false data immediately. Also, the FDR algorithm notifies the other peers to prohibit spreading of the false data in the environment. All this procedure is possible to be executed in each peer without any lookup server. The FDR algorithm needs only a little data exchange among peers. Through simulation, we show that it is more effective to reduce the network traffic than the previous P2P strategy. We also show that the proposed strategy improves the performance of network compared to previous P2P strategy. As a result, The FDR strategy is decreased 9.78 ~ 16.84% of mean true data transmission time.
  • 11.

    A Study on the Optimum Weight Vector of Linearly Constrained Conditions

    Hosub Shin | 2011, 16(5) | pp.101~108 | number of Cited : 0
    Abstract PDF
    The optimum weight vector is studied to remove interference and jamming signals in adaptive array antenna system. The optimum weight vector is calculated to apply a minimum variance algorithm and cost function in linearly constrained conditions, and accurately estimates target`s signal. Adaptive array antenna system is the system which improves signal to noise ratio(SNR) and decreases interference and jammer power. Adaptive array antenna system delays at tap output of antenna array element. Each tap finally makes the complex signal of one in multiplier complex weight. In order to obtain optimum`s weight calculation, optimum weight vector is used in this paper. After simulation, resolution is increased below , and sidelobe is decreased about 10 dB.
  • 12.

    An development of framework and a supporting tool for organizing Grouped Folksonomy

    강유경 , Suk-Hyung Hwang | 2011, 16(5) | pp.109~126 | number of Cited : 1
    Abstract PDF
    A folksonomy is a new classification approach for organizing information by users to freely attach one or more tags to various resources published on the web. Recently, in order to provide useful services and organize the folksonomy data, many collaborative tagging systems based on folksonomy offer additional functionalities for grouping each elements of a folksonomy. In this paper, organization framework for grouped folksonomy is proposed. That is, we suggest the grouped folksonomy model that is an extended folksonomy with the concept of “group” and fundamental operations(Group Aggregation, Group Composition, Group Intersection, Group Difference) for grouping of folksonomy elements. Also, we developed a supporting tool(GFO) that constructs grouped folksonomy and executes fundamental operations. And we introduce some cases using the fundamental operations for grouping of each elements of folksonomy. Based on suggested our approach, we can construct grouped folksonomy and organize and extract useful information from the folksonomy data by grouping each elements of a folksonomy.
  • 13.

    A Design of the Finite State Machine to Control User's Gaze on a Screen

    문봉희 | 2011, 16(5) | pp.127~134 | number of Cited : 0
    Abstract PDF
    A finite state machine was designed to control user's gaze on the screen when the user is monitoring the . It consists of a set of situations where pupils are gazed and a set of states which decide the gaze on a screen or sleeping. The states were especially classified into main states, pre-states and potential states. The machine uses the situation history, which decide current state using continuous previous situation and current situation, and improves the accuracy to control the gaze on a screen. We implemented the machine with the data which were get using a pupil detection method, and tested the verification of the system with monitoring operations. The experimentation using the method which get date from real images shows advantage of decision whether it is temporary gaze or long-term gaze.
  • 14.

    A Sensor Data Management System for USN based Fire Detection Application

    Wonik Park , Kim, Young-Kuk | 2011, 16(5) | pp.135~146 | number of Cited : 1
    Abstract PDF
    These days, the research of a sensor data management system for USN based real-time monitoring application is active thanks to the development and diffusion of sensor technology. The sensor data is rapidly changeable, continuous and massive row level data. However, end user is only interested in high level data. So, it is essential to effectively process the row level data which is changeable, continuous and massive. In this paper, we propose a sensor data management system with multi-analytical query function using OLAP and anomaly detection function using learning based classifier. In the experimental section, we show that our system is valid through the some experimental scenarios. For the this, we use a sensor data generator implemented by ourselves.
  • 15.

    The study on th effects of system quality of Smart Phone on use of intention

    조현숙 , 양승복 | 2011, 16(5) | pp.147~152 | number of Cited : 22
    Abstract PDF
    The main Objectives of this paper are as follows. First, we investigated effects of Smart Phone quality on the usefulness and ease of use of Smart Phone. Then, we investigated effects of the usefulness and ease of use of Smart Phone on the intention of use. Our research model is based on TAM(Technology Acceptance Model)To accomplish the purpose of this paper effectively and efficiently, a survey was conducted based on the usage of Smart Phone. Then we conducted regression analyses on the collected data and found following results. First, Smart Phone quality have a significant effect on the usefulness and ease of use of Smart Phone. Second, the usefulness and ease of use of Smart Phone have significant effects on the intention of use. Third, Smart Phone users are more satisfied with the system quality than cellular phone users. And the continuous use intention of Smart-Phone users is higher than that of cellular phone users.
  • 16.

    Maximum Capacity-based Minimum Cut Algorithm

    Sang-Un, Lee | 2011, 16(5) | pp.153~162 | number of Cited : 3
    Abstract PDF
    The minimum cut problem is to minimize , that is, to determine source and sink such that the capacity of the cut is minimal. The flow-based algorithm is mostly used to find the bottleneck arcs by calculating flow network, and does not presents the minimum cut. This paper suggests an algorithm that simply includes the maximum capacity vertex to adjacent set or and finds the minimum cut without obtaining flow network in advance. On applying the suggested algorithm to 13 limited graphs, it can be finds the minimum cut value with simply and correctly.
  • 17.

    The Effect which the Motivating Factors of Teenagers have ontheir own Self-efficacy and School-life Satisfaction

    김경숙 | 2011, 16(5) | pp.163~172 | number of Cited : 4
    Abstract PDF
    This research is to investigate the effect of teenagers' motivating factors on their own self-efficacy and school-life satisfaction. Positive analysis of data was made based upon the theoretical background. Also, the casual relation between the motivating factors of teenagers and their self-efficacy and school-life satisfaction was verified. The result of the study was as follows : stress, family effect, and mass communications had an effect on intrinsic motivation and extrinsic motivation. The intrinsic motivation had an effect on the school-life satisfaction, and the extrinsic motivation was revealed to have an effect on the self-efficacy and school-life satisfaction. Students' self-efficacy also influenced their school-life satisfaction. This study suggested a few methods to improve teenagers' self-efficacy and their school-life satisfaction through the motivating factors.
  • 18.

    The Effects of Client Violence on the Burnout of Social Workers Working for Social Welfare Facilities-Focusing on the moderating effects of Institutional confrontation system and demographic characteristic -

    정은미 , Hwie- Seo, Park | 2011, 16(5) | pp.173~183 | number of Cited : 33
    Abstract PDF
    The purpose of this study is to suggest the policy implications through the analysis on the effects of social workers' negative reactions for client violence on burnout. Especially, This study is focused on identifying the moderating effects of demographic characteristics and institutional confrontations system. This study was carried out based on survey of social workers on social welfare facilities located in G metropolitan city and J province. The major findings can be summarized as follows. First, Social workers' negative reactions toward client violence affect on burnout significantly. Second, demographic characteristics and institutional confrontations system moderate the relationship between social workers' negative reactions toward client violence and their burnout. This study suggested some implications basing on the analytical results.