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

2020 KCI Impact Factor : 0.4
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2015, Vol.20, No.8

  • 1.

    A Novel Method of Improving Cache Hit-rate in Hadoop MapReduce using SSD Cache

    김종찬 | 안재훈 | 김영환 and 1other persons | 2015, 20(8) | pp.1~6 | number of Cited : 0
    Abstract PDF
    The MapReduce Program of Hadoop Distributed File System operates on any unspecified nodes due to distributed-parallel process and block replicate for data stability. Since it is difficult to guarantee the cache locality when a Solid State Drive is used as a cache in hadoop, cache hit-rate is decreased. In this paper, we suggest a method to improve cache hit rate by pre-loading the input data of the MapReduce onto the SSD cache. To perform this method, we estimated the blocks that are used on each node by using capacity scheduler and block metadata. Eventually we could increase the performance of SSD cache by loading the blocks onto SSD cache before the Map Task run.
  • 2.

    An advertisement method using inaudible sound of speaker

    MyoungBeom Chung | 2015, 20(8) | pp.7~13 | number of Cited : 2
    Abstract PDF
    Recently, there are serviced user customized advertisement of various type using smart device. Representative services are advertisement service using light of smart TV screen or audible sound of smart TV to transmit advertisement information. However, those services have to do a specific action of smart device user for advertisement information or need audible audio information of TV contents. To overcome those weakness, therefore, we propose an advertisement method using inaudible sound of speaker based on smart device. This method supports the transfer of advertising content to the smart device user with no additional action or TV audio signal required to access that content. The proposed method used two high frequencies among 18kHz ~ 22kHz of audible frequency range which smart TV can send out. And it generates those frequencies synthesized with audio of TV contents as trigger signal which can send advertisements to smart device. Next, smart device analysis the trigger signal and request advertisement contents related to the signal to server. After then, smart device can show the downloaded contents to user. Because the proposed method uses the high frequencies of sound signals via the inner speaker of the smart device, its main advantage is that it does not affect the audio signal of TV content. To evaluate the efficacy of the proposed method, we developed an application to implement it and subsequently carried out an advertisement transmission experiment. The success rate of the transmission experiment was approximately 97%. Based on this result, we believe the proposed method will be a useful technique in introducing a customized user advertising service.
  • 3.

    Sasang Constitution Classification System by Morphological Feature Extraction of Facial Images

    이혜림 | 조진수 | 2015, 20(8) | pp.15~21 | number of Cited : 0
    Abstract PDF
    This study proposed a Sasang constitution classification system that can increase the objectivity and reliability of Sasang constitution diagnosis using the image of frontal face, in order to solve problems in the subjective classification of Sasang constitution based on Sasang constitution specialists’ experiences. For classification, characteristics indicating the shapes of the eyes, nose, mouth and chin were defined, and such characteristics were extracted using the morphological statistic analysis of face images. Then, Sasang constitution was classified through a SVM (Support Vector Machine) classifier using the extracted characteristics as its input, and according to the results of experiment, the proposed system showed a correct recognition rate of 93.33%. Different from existing systems that designate characteristic points directly, this system showed a high correct recognition rate and therefore it is expected to be useful as a more objective Sasang constitution classification system.
  • 4.

    A Revised Timing-sync Protocol for Sensor Networks by a Polling Method

    Bae,Shi-Kyu | 2015, 20(8) | pp.23~28 | number of Cited : 2
    Abstract PDF
    TPSN(Timing-sync Protocol for Sensor Networks), the representative of time synchronization protocol for WSN(wireless sensor networks), was developed to provide higher synchronization accuracy and energy efficiency. So, TPSN’s approach has been referenced by so many other WSN synchronization schemes till now. However, TPSN has a collision problem due to simultaneous transmission among competing nodes, which causes more network convergence delay for a network-wide synchronization. A Polling-based scheme for TPSN is proposed in this paper. The proposed scheme not only shortens network-wide synchronization time of TPSN, but also reduce collision traffic which lead to needless power consumption. The proposed scheme's performance has been evaluated and compared with an original scheme by simulation. The results are shown to be better than the original algorithm used in TPSN.
  • 5.

    Multiple Parallel-Pollard's Rho Discrete Logarithm Algorithm

    Sang-Un, Lee | 2015, 20(8) | pp.29~33 | number of Cited : 2
    Abstract PDF
    This paper proposes a discrete logarithm algorithm that remarkably reduces the execution time of Pollard's Rho algorithm. Pollard's Rho algorithm computes congruence or collision of αaβb≡ αAβB(modp) from the initial value a=b=0 , only to derive γ from (a+bγ)=(A+Bγ),γ(B-b)=(a-A). The basic Pollard's Rho algorithm computes xi=(xi-1)2, αxi-1, βxi-1 given αaβb ≡ x (mod p) , and the general algorithm computes xi=(xi-1)2, Mxi-1, Nxi-1 for randomly selected M=αm, N=βn .This paper proposes 4-model Pollard Rho algorithm that seeks βγ=αγ, βγ=α(p-1)/2+γ and βγ-1=α(p-1)-γ) from m=n= ⌈√n⌉, (a,b)=(0,0),(1,1). The proposed algorithm has proven to improve the performance of the (0,0) ─ basic Pollard's Rho algorithm by 71.70% .
  • 6.

    Enhancement of Internal Control by expanding Security Information Event Management System

    임동성 | Yong-Min Kim | 2015, 20(8) | pp.35~43 | number of Cited : 1
    Abstract PDF
    Recently, internal information leaks is increasing rapidly by internal employees and authorized outsourcing personnel. In this paper, we propose a method to integrate internal control systems like system access control system and Digital Rights Managements and so on through expansion model of SIEM(Security Information Event Management system). this model performs a analysis step of security event link type and validation process. It develops unit scenarios to react illegal acts for personal information processing system and acts to bypass the internal security system through 5W1H view. It has a feature that derives systematic integration scenarios by integrating unit scenarios. we integrated internal control systems like access control system and Digital Rights Managements and so on through expansion model of Security Information Event Management system to defend leakage of internal information and customer information. We compared existing defense system with the case of the expansion model construction. It shows that expanding SIEM was more effectively.
  • 7.

    An Approach for Developing Web Applications by Reusing Components of e-Government Standard Framework

    Mi-kyeong Moon | 김동주 | 2015, 20(8) | pp.45~52 | number of Cited : 0
    Abstract PDF
    To solve the problem of low inter-operability of systems and low reusability caused by not being standardized and common-shared development foundation between software developers, the government has proposed e-Government(eGov) standard framework. However, the development method based on eGov standard framework is not easy to learn and to use fluently, because it is so dissimilar the existing traditional development method. In this paper, we propose an approach for developing web applications by reusing common components of eGov standard framework, and describe about the case study of developing Can_Pro(Computer Aided Nutritional analysis program for Professionals) based on eGov standard framework. Consequently, we show improvement in productivity and reduction budget through reusability of common components and eGov standard framework.
  • 8.

    Sound Visualization Method using Joint Time-Frequency Analysis for Visual Machine Condition Monitoring

    JungHee Seo | PARK HUNG BOG | 2015, 20(8) | pp.53~59 | number of Cited : 1
    Abstract PDF
    Noise from the surrounding environment, building structures and machine equipment have significant effects on daily life. Many solutions to this problem have been suggested by analyzing causes of noise generated from particular locations in general buildings or machine equipment and detecting defects of buildings or equipment. Therefore, this paper suggests a visualization technique of sounds by using the microphone array to measure sound sources from machines and perform the visual machine condition monitoring (VMCM). By analyzing sound signals and presenting effective sound visualization methods, it can be applied to identify machine’s conditions and correct errors through real-time monitoring and visualization of noise generated from the plant machine equipment.
  • 9.

    A near control technology using high frequencies in audible frequency between smart devices

    MyoungBeom Chung | 2015, 20(8) | pp.61~67 | number of Cited : 1
    Abstract PDF
    The existing methods for control between smart devices in near used Bluetooth, WiFi-Direct, or socket communication using Wi-Fi. However, those have a problem that can not use when operating system of each smart devices is different or when socket server is not working. In this paper, we proposed a new near control technology using High frequencies in audible frequency between smart devices to supplement the problem of existing methods. High frequencies use micro-phone and speaker of smart device and are a control signals that is combined high frequencies within 18kHz ~ 22kHz among audible frequency range. The proposed technology using High frequencies do not need any extra communication modules or socket servers and can use the most smart devices without operating system of devices. To evaluate the performance of the proposed technology, we developed a music play and music control application applied the proposed technology and tested a control experiment using the developed applications. The control success rate was 97% and recognition rate of surrounding people about using high frequencies was under 5%. Therefore, the proposed technology will be the useful technology to control between smart devices in near.
  • 10.

    Design and Implementation of Software Vulnerability Analysis Algorithm through Static Data Access Analysis

    Hyun-il Lim | 2015, 20(8) | pp.69~75 | number of Cited : 0
    Abstract PDF
    Nowadays, software plays various roles in applications in wide areas. However, the security problems caused by software vulnerabilities increase. So, it is necessary to improve software security and safety in software execution. In this paper, we propose an approach to improve the safety of software execution by managing information used in software through static data access analysis. The approach can detect the exposures of secure data in software execution by analyzing information property and flows through static data access analysis. In this paper, we implemented and experimented the proposed approach with a base language, and verify that the proposed approach can effectively detect the exposures of secure information. The proposed approach can be applied in several areas for improving software safety by analysing vulnerabilities from information flows in software execution.
  • 11.

    Efficient Multimedia Data File Management and Retrieval Strategy on Big Data Processing System

    이재경 | 신수미 | KIM KYUNG CHANG | 2015, 20(8) | pp.77~83 | number of Cited : 0
    Abstract PDF
    The storage and retrieval of multimedia data is becoming increasingly important in many application areas including record management, video(CCTV) management and Internet of Things (IoT). In these applications, the files containing multimedia that need to be stored and managed is tremendous and constantly scaling. In this paper, we propose a technique to retrieve a very large number of files, in multimedia format, using the Hadoop Framework. Our strategy is based on the management of metadata that describes the characteristic of files that are stored in Hadoop Distributed File System (HDFS). The metadata schema is represented in Hbase and looked up using SQL On Hadoop (Hive, Tajo). Both the Hbase, Hive and Tajo are part of the Hadoop Ecosystem. Preliminary experiment on multimedia data files stored in HDFS shows the viability of the proposed strategy.
  • 12.

    Contents Sharing System for Push/Pull Services in DLNA-based Home Networks

    Soon Phil Choi | ParkByoungSeob | 김정규 | 2015, 20(8) | pp.85~92 | number of Cited : 0
    Abstract PDF
    Due to the advancements in the capabilities of smart devices and home networks, we are able to easily access multimedia contents stored in a home server. In this paper, we present a wireless media content sharing mechanism for home networks that utilizes UPnP-based DLNA technology. We also present a novel Peer-to-Peer content sharing system that is able to operate on the client as well as server. Our system supports multiple push/pull services simultaneously via a multi-thread technique, and our intuitive user interface facilitates ease of use. Future studies would explore the feasibility of implementing our system in a multi-hop environment or providing a community-wide service.
  • 13.

    A Study on the design and implementation of Intelligent Advertisement Operation System based on User’s Feedback in Mobile Environments

    이용기 | Nammee Moon | 2015, 20(8) | pp.93~104 | number of Cited : 0
    Abstract PDF
    In this paper, the design of intelligent_advertisement_operation system(IAdOS) based on user’s feedback is proposed for mobile environments. The proposed system stores the advertising contents created by the advertising provider and recommends the personalized advertising contents by analyzing the context information ,and then feedback information of the advertisements. Since the proposed system which can recommends provide the smart advertisement contents based on personal preference, it is expected to contribute the new service model development of in the field of advertising market.
  • 14.

    An Assignment Problem Algorithm Using Minimum Cost Moving Method

    Sang-Un, Lee | 2015, 20(8) | pp.105~112 | number of Cited : 2
    Abstract PDF
    Generally, the optimal solution of assignment problem has been obtained by Hungarian algorithm with O(n3) time complexity. This paper proposes more simple algorithm with O(n2) time complexity than Hungarian algorithm. The proposed algorithm simply selects minimum cost in each row, and classified into set S, H, and T. Then, the minimum cost is moved from S to T and S→H, H→T . The proposed algorithm can be obtain the same optimal solution as well-known algorithms and improve the optimal solution of partial unbalanced assignment problems.
  • 15.

    The Relationships between Damage Factors of Elder Abuse and Symptom Factors of Mental Health Problems using Multi-Variable Analysis

    Hwie- Seo, Park | 2015, 20(8) | pp.113~119 | number of Cited : 0
    Abstract PDF
    This study is to suggest the theoretical and practical implications by analysing the relationships between damage types of elder abuse experience and symptom types of mental health. For this study, I sampled 270 of the elders who has been abused and received council services for the aged. The results of this study showed that the relationships between damage types of elder abuse experiences and symptom types of mental health are significant. This study suggested some theoretical and practical implications on the base of the analytical results.
  • 16.

    The Effects of Coding Education Using the Unplugged Robot Education System on the Perceived Useful and Easy

    송정범 | 2015, 20(8) | pp.121~128 | number of Cited : 0
    Abstract PDF
    This study aimed to investigate the effects of an unplugged robot education system capable of computerless coding education. Specifically, this study compared this education system with PicoCricket, an educational robot that can also be used with elementary students in lower grades, using assessment tools on perceived usefulness and ease. Using random sampling and randomized assignment for more objective validation, 30 participants were assigned to the unplugged robot education system group (experimental group) and 30 participants were assigned to the PicoCricket group (control group), for a total of 60 study participants. The research procedure included verification of the equivalence of the two groups by conducting a pretest after a 2-hour basic training session on algorithms and programming. The experimental and control groups learned the same content using different educational tools in accordance with software training guidelines for a total of 12 hours. Then, the difference in perceived usefulness and ease between the two groups was examined using a post-treatment test. The study results showed that scores on both dependent variables, perceived usefulness and perceived ease, were significantly higher in the experimental group than the control group. Moreover, scores on all sub-variables of the dependent variables were significantly higher in the experimental group than the control group. These results suggest that learners using the unplugged robot education system found it more useful and easier to use than learners using the existing educational robot, PicoCricket. This study’s findings are significant, as according to the technology acceptance model, the perceived usefulness and ease of an educational tool are important variables that determine the acceptance of the tool (i.e., persistence of learning).