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A RSU-Aided Resource Search and Cloud Construction Mechanism in VANETs (차량 네트워크에서 RSU를 이용한 리소스 검색 및 클라우드 구축 방안)

  • Lee, Yoonhyeong;Lee, Euisin
    • KIPS Transactions on Computer and Communication Systems
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    • v.9 no.3
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    • pp.67-76
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    • 2020
  • With the fast development in wireless communications and vehicular technologies, vehicular ad hoc networks (VANETs) have enabled to deliver data between vehicles. Recently, VANETs introduce a Vehicular Cloud (VC) model for collaborating to share and use resources of vehicles to create value-added services. To construct a VC, a vehicle should search vehicles that intend to provide their own resource. The single-hop search cannot search enough provider vehicles due to a small coverage and non-line-of-sights of communications. On the other hand, the multi-hop search causes very high traffics for large coverage searching and frequent connection breakages. Recently, many Roadside Units (RSUs) have been deployed on roads to collect the information of vehicles in their own coverages and to connect them to Internet. Thus, we propose a RSU-aided vehicular resource search and cloud construction mechanism in VANETS. In the proposed mechanism, a RSU collects the information of location and mobility of vehicles and selects provider vehicles enabled to provide resources needed for constructing a VC of a requester vehicle based on the collected information. In the proposed mechanism, the criteria for determining provider vehicles to provide resources are the connection duration between each candidate vehicle and the requester vehicle, the resource size of each candidate vehicle, and its connection starting time to the requester vehicle. Simulation results verify that the proposed mechanism achieves better performance than the existing mechanism.

Development of Ubiquitous Sensor Network Intelligent Bridge System (유비쿼터스 센서 네트워크 기반 지능형 교량 시스템 개발)

  • Jo, Byung Wan;Park, Jung Hoon;Yoon, Kwang Won;Kim, Heoun
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.16 no.1
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    • pp.120-130
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    • 2012
  • As long span and complex bridges are constructed often recently, safety estimation became a big issue. Various types of measuring instruments are installed in case of long span bridge. New wireless technologies for long span bridges such as sending information through a gateway at the field or sending it through cables by signal processing the sensing data are applied these days. However, The case of occurred accidents related to bridge in the world have been reported that serious accidents occur due to lack of real-time proactive, intelligent action based on recognition accidents. To solve this problem in this study, the idea of "communication among things", which is the basic method of RFID/USN technology, is applied to the bridge monitoring system. A sensor node module for USN based intelligent bridge system in which sensor are utilized on the bridge and communicates interactively to prevent accidents when it captures the alert signals and urgent events, sends RF wireless signal to the nearest traffic signal to block the traffic and prevent massive accidents, is designed and tested by performing TinyOS based middleware design and sensor test free Space trans-receiving distance.

Automatic Detection of Usability Issues on Mobile Applications (모바일 앱에서의 사용자 행동 모델 기반 GUI 사용성 저해요소 검출 기법)

  • Ma, Kyeong Wook;Park, Sooyong;Park, Soojin
    • KIPS Transactions on Software and Data Engineering
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    • v.5 no.7
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    • pp.319-326
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    • 2016
  • Given the attributes of mobile apps that shorten the time to make purchase decisions while enabling easy purchase cancellations, usability can be regarded to be a highly prioritized quality attribute among the diverse quality attributes that must be provided by mobile apps. With that backdrop, mobile app developers have been making great effort to minimize usability hampering elements that degrade the merchantability of apps in many ways. Most elements that hamper the convenience in use of mobile apps stem from those potential errors that occur when GUIs are designed. In our previous study, we have proposed a technique to analyze the usability of mobile apps using user behavior logs. We proposes a technique to detect usability hampering elements lying dormant in mobile apps' GUI models by expressing user behavior logs with finite state models, combining user behavior models extracted from multiple users, and comparing the combined user behavior model with the expected behavior model on which the designer's intention is reflected. In addition, to reduce the burden of the repeated test operations that have been conducted by existing developers to detect usability errors, the present paper also proposes a mobile usability error detection automation tool that enables automatic application of the proposed technique. The utility of the proposed technique and tool is being discussed through comparison between the GUI issue reports presented by actual open source app developers and the symptoms detected by the proposed technique.

Knowledge based Text to Facial Sequence Image System for Interaction of Lecturer and Learner in Cyber Universities (가상대학에서 교수자와 학습자간 상호작용을 위한 지식기반형 문자-얼굴동영상 변환 시스템)

  • Kim, Hyoung-Geun;Park, Chul-Ha
    • The KIPS Transactions:PartB
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    • v.15B no.3
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    • pp.179-188
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    • 2008
  • In this paper, knowledge based text to facial sequence image system for interaction of lecturer and learner in cyber universities is studied. The system is defined by the synthesis of facial sequence image which is synchronized the lip according to the text information based on grammatical characteristic of hangul. For the implementation of the system, the transformation method that the text information is transformed into the phoneme code, the deformation rules of mouse shape which can be changed according to the code of phonemes, and the synthesis method of facial sequence image by using deformation rules of mouse shape are proposed. In the proposed method, all syllables of hangul are represented 10 principal mouse shape and 78 compound mouse shape according to the pronunciation characteristics of the basic consonants and vowels, and the characteristics of the articulation rules, respectively. To synthesize the real time facial sequence image able to realize the PC, the 88 mouth shape stored data base are used without the synthesis of mouse shape in each frame. To verify the validity of the proposed method the various synthesis of facial sequence image transformed from the text information is accomplished, and the system that can be applied the PC is implemented using the proposed method.

In-situ Observations of Gas Phase Dynamics During Graphene Growth Using Solid-State Carbon Sources

  • Kwon, Tae-Yang;Kwak, Jinsung;Chu, Jae Hwan;Choi, Jae-Kyung;Lee, Mi-Sun;Kim, Sung Youb;Shin, Hyung-Joon;Park, Kibog;Park, Jang-Ung;Kwon, Soon-Yong
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.08a
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    • pp.131-131
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    • 2013
  • A single-layer graphene has been uniformly grown on a Cu surface at elevated temperatures by thermally processing a poly(methyl methacrylate) (PMMA) film in a rapid thermal annealing (RTA) system under vacuum. The detailed chemistry of the transition from solid-state carbon to graphene on the catalytic Cu surface was investigated by performing in-situ residual gas analysis while PMMA/Cu-foil samples being heated, in conjunction with interrupted growth studies to reconstruct ex-situ the heating process. The data clearly show that the formation of graphene occurs with hydrocarbon molecules vaporized from PMMA, such as methane and/or methyl radicals, as precursors rather than by the direct graphitization of solid-state carbon. We also found that the temperature for vaporizing hydrocarbon molecules from PMMA and the length of time the gaseous hydrocarbon atmosphere is maintained, which are dependent on both the heating temperature profile and the amount of a solid carbon feedstock are the dominant factors to determine the crystalline quality of the resulting graphene film. Under optimal growth conditions, the PMMA-derived graphene was found to have a carrier (hole) mobility as high as ~2,700 cm2V-1s-1 at room temperature, superior to common graphene converted from solid carbon.

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A Study on Improvement of Legal System for Harmful Chemical Substance Response Management System (유해화학물질 대응시스템 적용을 위한 제도 개선 연구)

  • Oak, Young-Suk;Lee, Young-Sub
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.4
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    • pp.216-223
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    • 2017
  • Chemicals are an indispensable element of modern society to the extent that more than 15 million species are commercially available worldwide. However, among them are chemicals whose toxicityposes a threat to public health and the environment, as illustrated by past cases of chemical accidents, which revealed their danger to human life. Chemical accidents can spread and cause huge damage in a short time because of their characteristics. Therefore, it is important to do as much as possible to prevent them in advance and to respond promptly after an accident. The legal system pertaining to domestic chemical substances is the "Toxic Chemical Control Act", which is made up of the "Act on the Registration and Evaluation of Chemicals" and the "Chemical Control Act" since 2015. Under this law, the Comprehensive Chemical Information System and Chemical Substance Data Processing system were established and are still operating;however, chemical accidents are still occurring. These systems are comprehensive information systems aimed at providing chemical information rather than acting as chemical response systems, which has limited the effectiveness of accident response. This study is intended to analyze the information management systems, response management systems and the basis of chemical substance management support for hazardous chemicals and suggest ways to improve the legal system for developing and operating chemical response systemswithin a municipality.

Structure-Model Verification of Yacht Participants' Motivation, Basic Psychological Need Satisfaction and Intentions of Persistent Participation (요트참가자들의 기본심리욕구와 운동참가동기 및 지속적 참여 의도의 구조모형 검증)

  • Kim, Mi-Lyang
    • The Journal of the Korea Contents Association
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    • v.9 no.9
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    • pp.423-431
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    • 2009
  • The purpose of this study was verily the structure model of yacht participants' motives for sport participation, satisfactions of basic psychological need and intentions of persistent participation. Their motives for sport participation and satisfaction of basic psychological desires are reported as variables involving so much in their intentions of persistent participation in the sport activity in which participants of Life Exercise take part. Therefore, a survey research was conducted by aiming at members of yacht foyers' groups and university yacht clubs, 267 copies of the questionnaire in total were used for the analysis. SPSS 12.0 and AMOS 7.0 were used for the processing of the data, and exploratory factor analysis, confirmatory factor analysis, reliability analysis, correlation analysis and covariance structure model analysis were also applied according to each study objective. The results of the study were as follows: Firstly, there were significant correlations among yacht participants' satisfaction of basic psychological desires, participation motives and intentions of consistent participation. Secondly, yacht participants' satisfaction of basic psychological desires was found to have significant and direct effects on their intentions of persistent participation while haying indirect effects through the medium of their motives for sport participation at the same time. Thirdly, their motives for sport participation had significant effects on their intentions of persistent participation. Fourthly, suggested by the study, the structural equation model of yacht participants' motives for sport participation, satisfaction of basic psychological desires and intentions of persistent participation was found statistically appropriate.

Super Resolution Algorithm Based on Edge Map Interpolation and Improved Fast Back Projection Method in Mobile Devices (모바일 환경을 위해 에지맵 보간과 개선된 고속 Back Projection 기법을 이용한 Super Resolution 알고리즘)

  • Lee, Doo-Hee;Park, Dae-Hyun;Kim, Yoon
    • KIPS Transactions on Software and Data Engineering
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    • v.1 no.2
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    • pp.103-108
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    • 2012
  • Recently, as the prevalence of high-performance mobile devices and the application of the multimedia content are expanded, Super Resolution (SR) technique which reconstructs low resolution images to high resolution images is becoming important. And in the mobile devices, the development of the SR algorithm considering the operation quantity or memory is required because of using the restricted resources. In this paper, we propose a new single frame fast SR technique suitable for mobile devices. In order to prevent color distortion, we change RGB color domain to HSV color domain and process the brightness information V (Value) considering the characteristics of human visual perception. First, the low resolution image is enlarged by the improved fast back projection considering the noise elimination. And at the same time, the reliable edge map is extracted by using the LoG (Laplacian of Gaussian) filtering. Finally, the high definition picture is reconstructed by using the edge information and the improved back projection result. The proposed technique removes effectually the unnatural artefact which is generated during the super resolution restoration, and the edge information which can be lost is amended and emphasized. The experimental results indicate that the proposed algorithm provides better performance than conventional back projection and interpolation methods.

Mobile Presentation using Transcoding Method of Region of Interest (관심 영역의 트랜스코딩 기법을 이용한 모바일 프리젠테이션)

  • Seo, Jung-Hee;Park, Hung-Bog
    • The KIPS Transactions:PartC
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    • v.17C no.2
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    • pp.197-204
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    • 2010
  • An effective integration of web-based learning environment and mobile device technology is considered as a new challenge to the developers. The screen size, however, of the mobile device is too small, and its performance is too inferior. Due to the foregoing limit of mobile technology, displaying bulk data on the mobile screen, such as a cyber lecture accompanied with real-time image transmission on the web, raises a lot of problems. Users have difficulty in recognizing learning contents exactly by means of a mobile device, and continuous transmission of video stream with bulky information to the mobile device arouses a lot of load for the mobile system. Thus, an application which is developed to be applied in PC is improper to be used for the mobile device as it is, a player which is fitting for the mobile device should be developed. Accordingly, this paper suggests mobile presentation using transcoding techniques of the field concerned. To display continuous video frames of learning image, such as a cyber lecture or remote lecture, by means of a mobile device, the performance difference between high-resolution digital image and mobile device should be surmounted. As the transcoding techniques to settle the performance difference causes damage of image quality, high-quality image may be guaranteed by application of trial and error between transcoding and selected learning resources.

A Method for Migration of Legacy System into Web Service (레거시 시스템의 웹서비스화를 위한 마이그레이션 기법)

  • Park, Oak-Cha;Choi, Si-Won;Kim, Soo-Dong
    • The KIPS Transactions:PartD
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    • v.16D no.4
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    • pp.583-594
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    • 2009
  • Most of the SOA solutions applicable to businesses and organizations are taking a top-down methodology. It starts with an analysis of an organization's requirements, followed by definition of business models and identification of candidate services and ends with finding or developing required services. Challenges in adopting SOA while abandoning legacy systems involve time and cost required during the process. Many businesses and organizations want to gradually migrate into SOA while making the most of the existing system. In this paper, we propose A Method for Migration of Legacy System into Web Service(M-LSWS); it allows legacy system to be migrated into web service accessible by SOA and be used as data repositories. M-LSWS defines procedures for migration into reusable web services through analysis of business processes and identification of candidate services based on design specification and code of legacy system. M-LSWS aims to migrate of legacy system into web service appropriate for SOA. The proposed method consists of four steps: analysis of legacy system, elicitation of reusable service and its specification, service wrapping and service registration. Each step has its own process and guideline. The eligibility of the proposed method will be tested by applying the method to book management system.