• 한국CDE학회논문집
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• 제16권5호
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• pp.351-360
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• 2011

Product systems are quickly and frequently changed because Product Life Cycle is continuously reduced and adopting new product is steadily fast. Thus, various studies are progressed using simulation which is one of digital manufacturing. The research that is concerning simulation of control verification for shorten the commissioning which has a lot of trial and error is in progress. Also, simulation of control verification has strength that it can catch the errors in advance. However, a control program in simulation needs virtual factory for representation of control information. For this reason, excessive time and energy is put into controlling the virtual factory. So, in this paper, we construct library which is using exist data, in order to overcome limitation of these problems. Furthermore, we suggest methodology which can model and verify the process more speedy using library. Especially, we give body to the BB/BR Line process which has many altering equipment and need high technology effectively using physical and logical modeling. We can set up a control simulation environment very rapidly, as well as cut process time down using our suggestion.

• 시스템엔지니어링학술지
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• 제15권2호
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• pp.66-71
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• 2019

In digital pathology, an electronic system in the biomedical domain storage of the files is a big constrain and because all the analysis and annotation takes place at every user-end manually, it becomes even harder to manage the data that is being shared inside an enterprise. Therefore, we need such a storage system which is not only big enough to store all the data but also manage it and making communication of that data much easier without losing its true from. A virtual server setup is one of those techniques which can solve this issue. We set a main server which is the main storage for all the virtual machines(that are being used at user-end) and that main server is controlled through a hypervisor so that if we want to make changes in storage overall or the main server in itself, it could be reached remotely from anywhere by just using the server's IP address. The server in our case includes XML-RPC based API which are transmitted between computers using HTTP protocol. JAVA API connects to HTTP/HTTPS protocol through JAVA Runtime Environment and exists on top of other SDK web services for the productivity boost of the running application. To manage the server easily, we use Tkinter library to develop the GUI and pmw magawidgets library which is also utilized through Tkinter. For managing, monitoring and performing operations on virtual machines, we use Python binding to XML-RPC based API. After all these settings, we approach to make the system user friendly by making GUI of the main server. Using that GUI, user can perform administrative functions like restart, suspend or resume a virtual machine. They can also logon to the slave host of the pool in case of emergency and if needed, they can also filter virtual machine by the host. Network monitoring can be performed on multiple virtual machines at same time in order to detect any loss of network connectivity.

• Asia pacific journal of information systems
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• 제30권1호
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• pp.21-30
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• 2020

Bitcoin (BTC) is a type of cryptocurrency that supports transaction/payment of virtual money between BTC users without the presence of a central authority or any third party like bank. It uses some cryptographic techniques namely public- and private-keys, digital signature and cryptographic-hash functions, and they are used for making secure transactions and maintaining distributed public ledger called blockchain. In BTC system, each transaction signed by sender is broadcasted over the P2P (Peer-to-Peer) Bitcoin network and a set of such transactions collected over a period is hashed together with the previous block/other values to form a block known as candidate block, where the first block known as genesis-block was created independently. Before a candidate block to be the part of existing blockchain (chaining of blocks), a computation-intensive hard problem needs to be solved. A number of miners try to solve it and a winner earns some BTCs as inspiration. The miners have high computing and hardware resources, and they play key roles in BTC for blockchain formation. This paper mainly analyses the underlying cryptographic techniques, identifies some weaknesses and proposes their enhancements. For these, two modifications of BTC are suggested ― (i) All BTC users must use digital certificates for their authentication and (ii) Winning miner must give signature on the compressed data of a block for authentication of public blocks/blockchain.

• 한국CDE학회논문집
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• 제16권4호
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• pp.249-259
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• 2011

In this paper we present our work on the parameterized construction of virtual drivers' reach motion to seat belt, by using motion capture data. A user can generate a new reach motion by controlling a number of parameters. We approach the problem by using multiple sets of example reach motions and learning the relation between the labeling parameters and the motion data. The work is composed of three tasks. First, we construct a motion database using multiple sets of labeled motion clips obtained by using a motion capture device. This involves removing the redundancy of each motion clip by using PCA (Principal Component Analysis), and establishing temporal correspondence among different motion clips by automatic segmentation and piecewise time warping of each clip. Next, we compute motion blending functions by learning the relation between labeling parameters (age, hip base point (HBP), and height) and the motion parameters as represented by a set of PC coefficients. During runtime, on-line motion synthesis is accomplished by evaluating the motion blending function from the user-supplied control parameters.

• 한국멀티미디어학회논문지
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• 제10권3호
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• pp.411-419
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• 2007

EVM(Embedded Virtual Machine)은 모바일 디바이스, 셋톱박스, 디지털 TV에 탑재되어 하드웨어에 독립적으로 수행되는 스택기반 가상기계이며, SIL(Standard Intermediate Language)은 EVM의 중간언어로 객체지향 언어와 순차적인 언어를 위한 연산 코드 집합을 갖고 있다. 기존에는 C 프로그램을 실행하기위해 플랫폼에 의존적인 목적코드로 변환하여 실행하였다. 이런 문제를 해결하기 위해 본 연구팀은 EVM을 개발하면서 목적기계의 코드가 아닌 플랫폼에 독립적인 스택기반의 SIL 코드를 생성하는 ANSI C 컴파일러를 개발하였다. 본 논문에서는 ANSI C 컴파일러가 생성한 SIL 코드를 3-주소 코드 형태의 재 표현된 ANSI C 프로그램으로 변환하는 SIL-to-C 역컴파일러(Decompiler) 시스템을 설계하고 구현하였다. 이와 같은 작업은 ANSI C 컴파일러가 생성한 SIL 코드가 올바른지를 확인할 수 있는 검증 방법을 제시하며, 소프트웨어 오작동 및 버전 호환이 이루어지지 않을 때 소프트웨어의 구조를 변경하고 수정하여 성능을 개선하는 작업을 용이하게 한다.

• 디지털산업정보학회논문지
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• 제12권3호
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• pp.125-132
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• 2016

The European Telecommunication Standards Institute (ETSI) Technical Committee (TC) Reconfigurable Radio Systems (RRS) is standardizing the multi-mode Mobile Device (MD). The configuration of multi-mode MD is determined by the downloaded mobile communication standard software. In this paper, we introduce the Radio Library concept for multi-mode MD which is one of the key components of RRS standard. This paper also introduces the Standard Functional Block which is a part of Radio Library. A method for selecting efficiency SFBs for multi-mode MD is presented and a Radio Library is generated based on the selected SFBs. This paper also shows sample Standard Functional Block Set which included in Radio Library. In order to verify the compatibility of the generated Radio Library which was made by C language, we implement the LTE Rel-10 and Wi-Fi(802.11b) to show the efficiency of generating a mobile communication standard software based on the Radio Library. Then using the Prograph Visual Programming MartenTM 1.6.4, we compiled our LTE Rel-10 and Wi-Fi(802.11b) source code.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2010년도 춘계학술대회
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• pp.339-342
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• 2010

본 논문은 각 방송사에서 가상스튜디오를 활용하여 제작하고 있는 프로그램 사례에 대하여 조사 분석한 것이다. 방송사에서 프로그램을 제작 할 때 실제세트 대신 가상스튜디오를 활용하여 제작함으로써 시각적으로 표현의 한계를 넘어서고 있다. 이러한 흐름은 단순한 합성작업을 통한 방송 제작이 아니라 현실과 가상을 구별할 수 없을 정도로 자연스런 영상표현을 통해 보다 사실적이고 정교한 영상으로 진화하는 과정이다. 국내 가상스튜디오를 활용한 제작사례를 분석하여 가상스튜디오 제작에 대한 발전 방향을 제시하였다.

• 한국의류학회지
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• 제46권6호
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• pp.1004-1022
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• 2022

This study seeks to investigate K-fashion's external image by examining the trends in global media reporting. It applies Dynamic Topic Modeling (DTM), which captures the evolution of topics in a sequentially organized corpus of documents, and consists of text preprocessing, the determination of the number of topics, and a timeseries analysis of the probability distribution of words within topics. The data set comprised 551 online media articles on 'Korean fashion' or 'K-fashion' published on Google News between 2010 and 2021. The analysis identifies seven topics: 'brand look and style,' 'lifestyle,' 'traditional style,' 'Seoul Fashion Week (SFW) event,' 'model size,' 'K-pop,' and 'fashion market,' as well as annual topic proportion trends. It also explores annual word changes within the topic and indicates increasing and decreasing word patterns. In most topics, the probability distribution of the word 'brand' is confirmed to be on the increase, while 'digital,' 'platform,' and 'virtual' have been newly created in the 'SFW event' topic. Moreover, this study confirms the transition of each K-fashion topic over the past 12 years, along with various factors related to Hallyu content, traditional culture, government support, and digital technology innovation.

• Journal of Multimedia Information System
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• 제3권3호
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• pp.47-52
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• 2016

This research paper examines the usage of graphic imaging in Holographic Projections to further advance the medical field. It highlights the importance and necessity of this technology as well as avant-garde techniques applied in the process of displaying images in digital holography. This paper also discusses the different types of applications for holograms in society today. Different tools were utilized to transfer a set of a cancer patient's brain tumor data into data used to produce a 3D holographic image. This image was produced through the transfer of data from one program to another. Through the use of semi-automatic segmentation through the seed region method, we were able to create a 3D visualization from Computed Tomography (CT) data.

• 한국과학교육학회지
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• 제43권2호
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• pp.59-72
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• 2023

이 연구에서는 중학교 과학 교사 6명과 중학생 8명을 대상으로 집단 면담을 하여 중학교 과학 디지털 교과서의 실감형 콘텐츠에 대한 교사와 학생의 평가 기준 및 내용을 분석하였다. 평가 대상은 중학교 2학년 '지구와 우주' 영역에 수록된 2개의 증강현실 콘텐츠와 2개의 가상현실 콘텐츠였다. 연구 결과 교사와 학생들은 'VR/AR 매체 특성', '기술적 구동', '사용자 인터페이스', '교수-학습 설계 측면' 네 개의 평가 기준으로 실감형 콘텐츠를 평가하였다. 각 측면에서의 평가 내용은 다음과 같았다. 첫째, VR/AR 매체 특성 측면에서 실감형 콘텐츠의 신기함과 흥미로움 그리고 동영상과 같은 매체와 달리 직접 조작이 가능하다는 점은 긍정적으로 인식되었으나 시각적 실재감이 부족하고 마커 활용 부분이 부정적으로 평가되었다. 둘째, 기술적 구동 측면에서 특정 OS에서 제대로 작동되지 않는 점, 실감형 콘텐츠 앱 내 개별 콘텐츠의 용량이 크다는 점, 빈번한 앱 프리징 현상이 빈번하게 발생한다는 점이 부정적으로 평가되었다. 셋째, 낮은 직관성과 낮은 유연성으로 사용자 인터페이스 측면에서 부정적인 평가를 받았다. 넷째, 교수-학습 설계 측면에서 교사들은 콘텐츠에 과학적으로 정확한 정보가 포함되어 있는지, 학생들이 콘텐츠의 내용을 쉽게 이해할 수 있는지, 교사가 계획하는 수업 목표나 내용을 담고 있는지, 학생들의 탐구 활동에 도움이 되는지를 기준으로 실감형 콘텐츠를 평가하였으며 대체로 부정적인 평가가 많았다. 학생들은 주로 자신들의 과학 학습에 도움 여부를 기준으로 학교 과학 학습에서의 실감형 콘텐츠가 크게 필요하지 않다고 하였다. 이러한 연구 결과에 기초하여 과학 교수·학습을 위한 실감형 콘텐츠 개발 방향을 논의하고 후속 연구에 대해 제언하였다.