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

2020 KCI Impact Factor : 0.4
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2020, Vol.25, No.1

  • 1.

    A Study on Efficient Executions of MPI Parallel Programs in Memory-Centric Computer Architecture

    Je-Man Lee | Seung-Chul Lee | Shin Dong Ha | 2020, 25(1) | pp.1~11 | number of Cited : 0
    Abstract PDF
    In this paper, we present a technique that executes MPI parallel programs, that are developed on processor-centric computer architecture, more efficiently on memory-centric computer architecture without program modification. The technique we present here improves performance by replacing low-speed data communication over the network of MPI library functions with high-speed data communication using the property called fast large shared memory of memory-centric computer architecture. The technique we present in the paper is implemented in two programs. The first program is a modified MPI library called MC-MPI-LIB that runs MPI parallel programs more efficiently on memory-centric computer architecture preserving the semantics of MPI library functions. The second program is a simulation program called MC-MPI-SIM that simulates the performance of memory-centric computer architecture on processor-centric computer architecture. We developed and tested the programs on distributed systems environment deployed on Docker based virtualization. We analyzed the performance of several MPI parallel programs and showed that we achieved better performance on memory-centric computer architecture. Especially we could see very high performance on the MPI parallel programs with high communication overhead.
  • 2.

    An Efficient Multiplexer-based AB2 Multiplier Using Redundant Basis over Finite Fields

    Keewon Kim | 2020, 25(1) | pp.13~19 | number of Cited : 0
    Abstract PDF
    In this paper, we propose a multiplexer based scheme that performs modular AB2 multiplication using redundant basis over finite field. Then we propose an efficient multiplexer based semi-systolic AB2 multiplier using proposed scheme. We derive a method that allows the multiplexers to perform the operations in the cell of the modular AB2 multiplier. The cell of the multiplier is implemented using multiplexers to reduce cell latency. As compared to the existing related structures, the proposed AB2 multiplier saves about 80.9%, 61.8%, 61.8%, and 9.5% AT complexity of the multipliers of Liu et al., Lee et al., Ting et al., and Kim-Kim, respectively. Therefore, the proposed multiplier is well suited for VLSI implementation and can be easily applied to various applications.
  • 3.

    Hybrid Scheduling Algorithm based on DWDRR using Hysteresis for QoS of Combat Management System Resource Control

    Gi-Yeop Lee | 2020, 25(1) | pp.21~27 | number of Cited : 0
    Abstract PDF
    In this paper, a hybrid scheduling algorithm is proposed for CMS(Combat Management System) to improve QoS(Quality of Service) based on DWDRR(Dynamic Weighted Deficit Round Robin) and priority-based scheduling method. The main proposed scheme, DWDRR is method of packet transmission through giving weight by traffic of queue and priority. To demonstrate an usefulness of proposed algorithm through simulation, efficiency in special section of the proposed algorithm is proved. Therefore, We propose hybrid algorithm between existing algorithm and proposed algorithm. Also, to prevent frequent scheme conversion, a hysteresis method is applied. The proposed algorithm shows lower packet loss rate and delay in the same traffic than existing algorithm.
  • 4.

    An Aging Measurement Scheme for Flash Memory Using LDPC Decoding Information

    Taegeun Kang | Hyunbean Yi | 2020, 25(1) | pp.29~36 | number of Cited : 0
    Abstract PDF
    Wear-leveling techniques and Error Correction Codes (ECCs) are essential for the improvement of the reliability and durability of flash memories. Low-Density Parity-Check (LDPC) codes have higher error correction capabilities than conventional ECCs and have been applied to various flash memory-based storage devices. Conventional wear-leveling schemes using only the number of Program/Erase (P/E) cycles are not enough to reflect the actual aging differences of flash memory components. This paper introduces an actual aging measurement scheme for flash memory wear-leveling using LDPC decoding information. Our analysis, using error-rates obtained from an flash memory module, shows that LDPC decoding information can represent the aging degree of each block. We also show the effectiveness of the wear-leveling based on the proposed scheme through wear-leveling simulation experiments.
  • 5.

    Efficient Semi-systolic AB2 Multiplier over Finite Fields

    Keewon Kim | 2020, 25(1) | pp.37~43 | number of Cited : 0
    Abstract PDF
    In this paper, we propose an efficient AB2 multiplication algorithm using SPB(shifted polynomial basis) over finite fields. Using the feature of the SPB, we split the equation for AB2 multiplication into two parts. The two partitioned equations are executable at the same time, and we derive an algorithm that processes them in parallel. Then we propose an efficient semi-systolic AB2 multiplier based on the proposed algorithm. The proposed multiplier has less area-time (AT) complexity than related multipliers. In detail, the proposed AB2 multiplier saves about 94%, 87%, 86% and 83% of the AT complexity of the multipliers of Wei, Wang-Guo, Kim-Lee, Choi-Lee, respectively. Therefore, the proposed multiplier is suitable for VLSI implementation and can be easily adopted as the basic building block for various applications.
  • 6.

    Improved CNN Algorithm for Object Detection in Large Images

    Seong Bong Yang | Soojin Lee | 2020, 25(1) | pp.45~53 | number of Cited : 4
    Abstract PDF
    Conventional Convolutional Neural Network(CNN) algorithms have limitations in detecting small objects in large image. In this paper, we propose an improved model which is based on Region Of Interest(ROI) selection and image dividing technique. We prepared YOLOv3 / Faster R-CNN algorithms which are transfer-learned by airfield and aircraft datasets. Also we prepared large images for testing. In order to verify our model, we selected airfield area from large image as ROI first and divided it in two power n orders. Then we compared the aircraft detection rates by number of divisions. We could get the best size of divided image pieces for efficient small object detection derived from the comparison of aircraft detection rates. As a result, we could verify that the improved CNN algorithm can detect small object in large images.
  • 7.

    A New Residual Attention Network based on Attention Models for Human Action Recognition in Video

    Kim, JeeHyun | Young Im Cho | 2020, 25(1) | pp.55~61 | number of Cited : 0
    Abstract PDF
    With the development of deep learning technology and advances in computing power, video-based research is now gaining more and more attention. Video data contains a large amount of temporal and spatial information, which is the biggest difference compared with image data. It has a larger amount of data. It has attracted intense attention in computer vision. Among them, motion recognition is one of the research focuses. However, the action recognition of human in the video is extremely complex and challenging subject. Based on many research in human beings, we have found that artificial intelligence-like attention mechanisms are an efficient model for cognition. This efficient model is ideal for processing image information and complex continuous video information. We introduce this attention mechanism into video action recognition, paying attention to human actions in video and effectively improving recognition efficiency. In this paper, we propose a new 3D residual attention network using convolutional neural network based on two attention models to identify human action behavior in the video. An evaluation result of our model showed up to 90.7% accuracy.
  • 8.

    Indoor positioning technique using the landmark based on relative AP signal strengths

    Hyunjung Kim | Jang, Beakcheol | 2020, 25(1) | pp.63~69 | number of Cited : 0
    Abstract PDF
    In this paper, we propose an indoor positioning technique using the landmark based on relative Access Point (AP) signal strengths. The absolute values of AP signals are used to conventional indoor positioning technologies, but they may be different because of the difference of the measuring device, the measuring environment, and the timing of the measurements. However, we found the fact that the flow of the AP's RSSI in certain places shows almost constant patterns. Based on theses characteristics, we identify the relative strength between the APs and store the certain places as landmarks where they show certain patterns. Once the deployment of the landmark map is complete, system calculate position of user using the IMU sensor of smartphone and calibrate it with stored landmarks. Our system shows 75.2% improvement over technology that used only sensors, and 39.6% improvement over technology that used landmarks that were selected with absolute values.
  • 9.

    Proposed image encryption method using PingPong256

    Ki Hawn Kim | Lee, HoonJae | YOUNG SIL LEE | 2020, 25(1) | pp.71~77 | number of Cited : 1
    Abstract PDF
    In this paper, we propose a method in which PingPong256 combines LFSR and variable clock to generate an irregular PRNG and use it for image encryption. PingPong256 is guaranteed an extended period based on the two LFSRs, and the variable clock is a structure that outputs the result of operating a predetermined clock in one operation by referring to the state of the different LFSR. A variable clock is characterized by the difficulty of predicting the output at any time because the choice increases with time. PingPong256 combines the advantages of LFSR and variable clock, the convenience of hardware and software implementation, and the benefits of sensitivity and irregular periods. Also, the statistical safety was verified using the NIST SP800-22, the safety of the proposed method, and the sensitivity of the image change was tested using NPCR and UACI.
  • 10.

    Implementation of AES and ARIA algorithm with Secure Structure for Power Analysis using LFSR Masking

    Youngjin Kang | Ki-Hwan Kim | Lee, HoonJae | 2020, 25(1) | pp.79~86 | number of Cited : 0
    Abstract PDF
    In this paper, we analyzed the case vulnerable to the power analysis attack of the ARIA algorithm and AES algorithm. Through this, we propose an algorithm with a safe structure for power analysis and prove through experiment. The proposed technique is a masking method using LFSR with a cyclic structure. To verify this, 1000, 2000, and 4000 power traces were collected, and the corresponding results are shown and proved. We used ATmega328 Chip for Arduino Uno for the experiment and mounted each algorithm. In order to measure the power consumption, a resistor was inserted and then proceeded. The analysis results show that the proposed structure has a safe structure for power analysis. In the future, we will study ways to lead to performance enhancement.
  • 11.

    Blockchain-based Lightweight Mutual Authentication Protocol for IoT Systems

    Wonseok Choi | Kim Sung soo | Han Ki-Jun | 2020, 25(1) | pp.87~92 | number of Cited : 0
    Abstract PDF
    Various devices, which are powerful computer and low-performance sensors, is connected to IoT network. Accordingly, applying mutual authentication for devices and data encryption method are essential since illegal attacks are existing on the network. But cryptographic methods such as symmetric key and public key algorithms, hash function are not appropriate to low-performance devices. Therefore, this paper proposes blockchain-based lightweight IoT mutual authentication protocol for the low-performance devices.
  • 12.

    Design and Implementation of STEAM Game Contents for infant Learning Education using Gyroscope Sensor

    Song Mi Yeong | 2020, 25(1) | pp.93~99 | number of Cited : 0
    Abstract PDF
    With the development of digital technology and the increasing demand for learning how to improve one's ability to solve problems through play and participation interactions, a variety of edutainment game contents are being developed. The edutainment game contents developed until recently have received a large number of contents for intelligence development and transfer of knowledge such as Korean and English mathematics for children and children. Recently, there have been various researches on the necessity and effect of STEAM education that foster convergent science and technology talents with comprehensive thinking ability and scientific inquiry spirit through the fusion education method among the subjects including science, technology, engineering, mathematics, And there is a growing need for the development of a parish suitable for STEAM education. However, there is a lack of STEAM educational content development that incorporates the technology of creative convergence talent training to develop talented people who can think and solve problems by crossing various academic boundaries. Therefore, this study develops game contents for early childhood education by combining STEAM education which foster convergent science and technology talents with comprehensive thinking ability and scientific inquiry spirit. And we designed and implemented STEAM game contents for infant learning education which can induce the interest of children and have fun by using gyroscope sensor of smartphone.
  • 13.

    Realistic Seeing Through Method and Device Through Adaptive Registration between Building Space and Telepresence Indoor Environment

    Jun Lee | 2020, 25(1) | pp.101~107 | number of Cited : 0
    Abstract PDF
    We propose a realistic seeing through visualization methods in mixed reality environment. When a user wants to see specific location beyond a wall in indoor environment. The proposed system recognizes and registers the selected area using environment modelling and feature-based tracking. Then the selected area is diminished and the specific location is visualized in real-time. With the proposed seeing through methods, a user can understand spatial relationship of the building and can easily find the target location. We conducted a user study comparing the seeing through method to conventional indoor navigation service in order to investigate the potential of the proposed seeing through method. The proposed seeing through method was evaluated in navigation time in comparison with conventional approach. The proposed method enable users to navigate target locations 30% faster than the conventional approach.
  • 14.

    Measurement and Treatment of Abnormalities of Medial and Lateral Rotation of Upper Limb in Shoulder

    Shin Kwang Seong | EUM KYOUNG BAE | SeongYoon Shin | 2020, 25(1) | pp.109~115 | number of Cited : 0
    Abstract PDF
    The shoulder refers to the area connecting the human torso and arms, and plays a key role in moving both arms. In particular, it plays the most important role in sending both hands behind the head or away from our bodies. In this paper, we measure the angles of the medial and lateral rotations of the arm from the shoulder, identify the symptoms associated with abnormalities, and propose ways to prevent these symptoms. The angle of medial rotation and lateral rotation of the upper limb in the shoulder is generally 70° ~ 90°. If the angle falls below the reference value or feels pain, something is wrong with the shoulder. In addition, a total of 100 people (50 men and 50 women each) were tested to determine patients with abnormalities.
  • 15.

    The Variation of Indoor Air Quality in Nursing Home

    Ji dong Ha | Choi Mi Suk | 2020, 25(1) | pp.117~124 | number of Cited : 0
    Abstract PDF
    In this paper, we proposed a plan to maintain comfortable indoor air quality in nursing homes by suggesting ways to reduce items temporarily exceeding the reference values through real-time concentration variation analysis of indoor air quality. Five items including PM10, CO2, CO, VOC, and Radon are measured at nursing homes in spring (April) and autumn (September) was carried out and all of the measured items were analyzed to satisfy the criteria set by the Indoor Air Quality Control Act. As a result of the analysis of the real-time concentration change, the concentration of CO2 was close to the reference value based on the number of occupants in the sick room. Due to the disinfectant (alcohol) used to disinfect and the auxiliary tools (adhesive) used in the operation of the program such as making and coloring, it was analyzed to temporarily exceed the standard value in the hall. In conclusion, it is possible to provide pleasant indoor air quality and contribute to securing the nursing home's competitiveness if periodic ventilation, natural disinfectant and eco-friendly product are used in consideration of the thermal environment.
  • 16.

    The Effect of Stretching to Muscle Stiffness in Hospital Office Employees

    Ko Mingyun | Young-Ju Jeun | 2020, 25(1) | pp.125~130 | number of Cited : 2
    Abstract PDF
    This study is to investigate the effects of stretching of hospital office employees on muscle stiffness. A total of 40 healthy young women voluntarily participated in the study. The participants were randomized to the stretching groups and control groups. Before stretching, the participants measured muscle stiffness of sternocleidomastoid muscle, upper trapezius muscle suboccipital muscles and pectoralis minor. And then applied stretching to stretching group. Muscle stiffness remeasured five minutes later in each group. In all muscles, muscle stiffness of stretching group were significant decreased(p<.05), but control group were no significant difference between pre and post. therefore appropriate stretching is expected to prevent and reduce musculoskeletal diseases caused by increased muscle stiffness in hospital office employees.
  • 17.

    Development of Individual Stockout Response Index in the Online Fashion Products Shopping

    Kim Joohyun | Lee Jin-Hwa | Youngsik Kwak and 1other persons | 2020, 25(1) | pp.131~140 | number of Cited : 0
    Abstract PDF
    In this study, we analyzed the effect of consumer's cognitive response, emotional response and behavioral response on online shopping stockouts (ISRI: Individual Stockout Response Index). And we try to show the heterogeneity of the degree of consumer response by subdivision market based on the regularity of distribution. The ISRI was developed by Kim and Lee in 2016 and 2018, which were based on the items and factors of cognitive, emotional and behavioral responses. The exponential stockouts response of consumers in this study will give an accurate picture of what consumers want when stockouts. further research should be done on how consumers' reactions are influenced by situational characteristics, consumer characteristics, store characteristics and brand / product characteristics. Especially, the price level of the product will affect the consumer 's response in the case of online fashion goods shopping.
  • 18.

    A study on Decision Model of Disuse Status for the Commercial Vehicles Considering the Military Operating Environment

    Jae-Ha Lee | Hoseok Moon | 2020, 25(1) | pp.141~149 | number of Cited : 0
    Abstract PDF
    The proportion of commercial vehicles currently used by the private sector among the vehicles operated by the military is very high at 58% and plans to increase further in the future. As the proportion of commercial vehicles in the military has increased, it is also an important issue to determine whether to disuse of commercial vehicles. At present, the decision of disuse of commercial vehicles is subjectively judged by vehicle technical inspector using design life and vehicle usage information. However, the difference according to the military operation environment is not reflected and objective judgment criteria are not presented. The purpose of this study is to develop a model to determine the disuse status of commercial vehicles in consideration of military operating environment. The data used in the study were 1,746 commercial vehicles of three types: cars, vans and trucks. Using the information of the operating area, climate characteristic, vehicle condition the decision model of disuse status was constructed using the classification machine learning technique. The proposed decision model of disuse status has an average accuracy of about 97% and can be used in the field. Based on the results of the study, the policy suggestions were proposed in the short and long term to improve the performance of decision model of disuse status of commercial vehicles in the future and to establish a new data construction method within the logistics information system.
  • 19.

    Moderating Effect of Security Ability on the Relation between Privacy Concern and Internet Activities

    Hong Jaewon | 2020, 25(1) | pp.151~157 | number of Cited : 0
    Abstract PDF
    This study explored the moderating effects of security ability on the influence of privacy concerns on internet activity using Korea media panel survey data. To this end, we applied between-subjects factorial design between 2 (privacy concern high / low) × 2 (security ability high / low) groups and compared five types of internet activity among four groups by variance analysis. As a result, privacy concerns have a main effect on internet activity, and security ability have a moderating role in this relationship. Despite the privacy concerns, people do their internet activities in order to enjoy the benefit from the internet. This study have academic implication in that it focus on the issue of privacy paradox in terms of the type of internet activity. In addition, practical implications are that, in order to activate online activities of individuals in an internet-connected society, efforts for enhancing their security abilities are necessary.
  • 20.

    A Study on Service Quality Evaluation Model and Priority of Quality Factors in Customer Center

    Park, Deuk | 2020, 25(1) | pp.159~165 | number of Cited : 1
    Abstract PDF
    In spite of various studies on the service quality of customer center, the previous studies are mainly focused on the studies on the relationship between customer satisfaction and loyalty, rather than on the evaluation model of service quality. In this study, we reviewed the service quality of customer center factors discussed in previous studies and developed a hierarchical model for measuring customer service quality based on Brady and Cronin's (2001) model. The first level consists of interaction (process) quality, physical environment (system) quality, and outcome quality, and the second level consists of kindness, positiveness, professionalism, systematic, convenience, accessibility, accuracy, promptness, and reliability. In addition, based on the developed hierarchical model, the priority of each factor that customer center users consider important is analyzed by AHP methodology. As a result, the interaction quality was important in the first level, and professionalism, kindness, and accuracy were important in the second level. Such a study can be a guideline for establishing a standard for evaluating the service quality of customer center or for managing more importantly in practice.
  • 21.

    A Study on the Activation Strategies of the Inclusive Education and Disability Empathy Culture in the Information Society

    park | 2020, 25(1) | pp.167~175 | number of Cited : 0
    Abstract PDF
    The purpose of this study was to investigate the activation strategies of the inclusive education by sharing information & communication and creating a social disability empathy culture through literature review so that students with disabilities who receive inclusive education in general schools can get along with good friends and participate actively in various school or class events. The results of this study were as follows. First, in terms of volunteer activities of students without disabilities, the meaning, role, and activation strategies of inclusive education support for fostering disability empathy culture are described. Second, in terms of classroom management of classroom teachers, the meaning, role, and activation strategies of inclusive education support for fostering disability empathy culture are described. Third, in terms of special education teachers’ role, the meaning, role, and activation strategies of inclusive education support for fostering disability empathy culture are described. Fourth, in terms of school administrators and educational administration institutions, the meaning, role, and activation strategies of inclusive education support for fostering disability empathy culture are described. The results of this study would be used as basic data to spread the disability empathy culture and improve the quality of inclusive education for students with disabilities to have inclusive education in the information society and be integrated into the community successfully.
  • 22.

    The Effects of Perceived Medical Service Quality on Patient Satisfaction, Hospital’s Reputation and Loyalty

    Un-Kyong Choi | 2020, 25(1) | pp.177~185 | number of Cited : 2
    Abstract PDF
    The purpose of this study is to analyze the effect of patient's perceived medical quality of service on satisfaction, hospital reputation, and loyalty to provide a strategic way to increase profitability and competitiveness of hospitals by preventing the departure of existing customers and promoting reuse. AMOS 20.0 was used for structural model analysis and identification factor analysis and SPSS 21.0 program was used for empirical analysis. As a result, the quality of medical service had a significant effect on satisfaction and reputation, and the quality of medical service had the greatest effect on satisfaction. Satisfaction has a positive effect on reputation and loyalty and is an important factor in determining loyalty. Recognizing the importance of improving quality of service and building relationships with patients should be prepared for strengthening relationships.
  • 23.

    A Study on the Normative Recognition of Blockchain Smart Contract

    Song, Inbang | Yeonjong Kim | 2020, 25(1) | pp.187~198 | number of Cited : 1
    Abstract PDF
    In this paper, We purpose an improvement plan for the settlement of smart contracts into legal norms through the recognition of the norms of blockchain-based smart contracts and the main influence factors on the norms of smart contracts. First, in terms of the normative necessity of smart contracts, legal protection against technical errors, government-level public relations education, and basic laws governing smart contract business are needed. Second, the contract norms will be accepted by the contract norms based on the blockchain designed to make the responsible material clear in terms of smart contract usability. Third, in terms of regulation of smart contracts, it can be seen that smart contracts are subsumed from existing laws or considering new legislation, but the norm of smart contracts cannot be prioritized over ease of use.
  • 24.

    A study on the usage intention of AI(artificial intelligence) speaker

    Soon-Hong Kwon | Yangwhan Lim | Hyun Jeong Kim | 2020, 25(1) | pp.199~206 | number of Cited : 2
    Abstract PDF
    In this study, the factors affecting consumers' intention to use AI speakers were focused on the perceived value of the product and the perceived necessity of the product. Factors affectationist consumers' perceived value of the product were divided into benefits and costs. Reflecting the characteristics of information technology products, I included perceptions of usefulness of products. Empirical results show that consumers' perceptions of perceived benefits and usefulness of AI speaker products have a positive effect on perceived value and perceived necessity. Perception of necessity had a positive (+) significant effect on perception of value. Perception of necessity and perception of value had a positive(+) and positive effect on each intention of use. However, the cost perceived by consumers did not have a significant effect on perception of value.
  • 25.

    Changes of Pre-service Teachers’ Teaching Expertise through Lesson Plan Analysis

    Seong-Won Kim | Soyul Yi | Lee Youngjun | 2020, 25(1) | pp.207~219 | number of Cited : 1
    Abstract PDF
    This study analyzed the change of teaching expertise of pre-service teachers through TPACK education. In this study, we applied a programming-based TPACK education program developed by Kim and Lee (2019) to 20 prospective teachers. To analyze the pre-service teachers’ teaching expertise analyzed the lesson plan prepared before, during and after applying the educational program. As a result, Few teachers use technology in lesson plan, and the design of the instructor-led or experiment to confirmed content in curriculum or textbook. The use of technology has increased in the second Teaching Plan, but the technology was not used depending on the educational context. In the third lesson plan, all pre-service teachers were able to use technology in an educational context. Moreover, the teaching expertise of the pre-service teacher showed a statistically significant improvement in the lesson plan. This study founded that the programming-based TPACK education program was effective in enhancing the teaching expertise of the pre-service teacher.
  • 26.

    Study on Information Ethics Education and Production of Tools in Domestic Early Childhood Education Institutions

    Yan Ha | Lee Jong Man | 2020, 25(1) | pp.221~231 | number of Cited : 0
    Abstract PDF
    Due to the fourth industrial revolution, people are excessively exposed to smart devices regardless of age, and the dependence is increasing rapidly. In the same context, various problems on information ethics have emerged to infant teachers and children. Therefore, there is a need to present guidelines for infants on the correct use of smart devices. This study proposes means to promote information ethics education in infant education based on a survey on future teachers attending Department of Early Childhood Education. Also, it suggests development of various teaching materials. The main significance of the research is to provide a balanced information ethics education and to develop interactive teaching materials. It also calls for infant teachers, as wells as infants, to understand the need for information ethics education and to provide desirable media education for infants.