• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.277-280
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• 2002

MPEG-4 시스템은 다양한 멀티미디어 객체를 시공간에 배치하고, 사용자의 상호작용을 가능하게 하는 리치미디어 시스템의 표준을 정의하고 있다. MPEG-4 리치미디어 컨텐츠의 표현은 장면의 구성을 나타내는 BIFS와 장면 중에 스트림이 있을 때 이에 대한 보조정보 및 스트림의 물리적 위치를 연결하는 OD로 구성되며, 이는 MP4라는 표준 파일포맷형식으로 저장되어, 스트리밍 서비스나 저장매체 응용에 이용된다. 본 논문에서는 사용자가 용이하게 MPEG-4 리치미디어 컨텐츠를 저작할 수 있도록 도와주는 저작도구의 설계와 구현을 소개한다. 구현된 MPEG-4 컨텐츠 저작도구는 Windows20000 O/S환경에서 VisualStudio 6.0를 사용하여 C++로 구현하였다. 구현된 저작도구는 동영상, 오디오, 그래픽과 같은 다양한 미디어들을 사용자가 복잡합 MPEG-4 시스템을 의식하지 않고 편리한 사용자 인터페이스를 통해 공간과 시간에 배치하여 MPEG-4 리치미디어 컨텐츠 파일을 제작 할 수 있도록 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2004.05b
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• pp.744-747
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• 2004

Internet, media connecting global, has increased fast at every year. Many people have been used email as method of exchanging data. But, email has many problem. Existing email may reveal privacy and sensitive information because it ran read and modify email by simple method. So, It required development of strong cryptographic email system. This paper available that email system provide delivery and content proof and seure key-exchange using lava Crypto API

• Journal of Information Management
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• v.25 no.4
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• pp.1-35
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• 1994

This is a practical study on acquisition and efficiently use of CD-ROM databases of diverse subject areas which in recent has rapidly increased in quantity. This study was concentrated on the proposition of production CD-ROM database and intended to give effective ideas of its design. I analysed and compared several CD-ROM databases in aspects of their menu configuration and information retrieval technics, so that may present a rational norm.

• Proceedings of the Korea Information Processing Society Conference
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• 2019.10a
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• pp.2-4
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• 2019

PCI Express(PCIe) 버스는 시스템 내·외부의 다양한 디바이스들을 연결하는데 여전히 중요한 역할을 하고 있다. 이 PCIe 버스를 확장하기 위해서 PCIe 스위치가 사용되며 호스트(서버)와 외부 디바이스를 연결할 때 다양한 케이블 미디어가 사용된다. 본 연구에서는 광 타입과 구리선 타입의 2종류 케이블이 장착 가능한 자체 제작된 PCIe 어댑터 카드를 사용하여 응용 프로그램 레벨에서 성능을 확인하였다. 서로 다른 2종류의 디바이스들을 대상으로 실험한 결과, 성능상의 큰 차이는 발견되지 않아서 케이블의 종류와는 무관하게 상호 운영에 크게 문제가 없을 것으로 예상된다.

• The Korean Journal of Nuclear Medicine Technology
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• v.13 no.1
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• pp.51-56
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• 2009

Purpose: Recently, most hospitals are introducing the PACS system and use of the system continues to expand. But small-scaled PACS called MicroPACS has already been in use through open source programs. The aim of this study is to prove utility of operating a MicroPACS, as a substitute back-up device for conventional storage media like CDs and DVDs, in addition to the full-PACS already in use. This study contains the way of setting up a MicroPACS with open source programs and assessment of its storage capability, stability, compatibility and performance of operations such as "retrieve", "query". Materials and Methods: 1. To start with, we searched open source software to correspond with the following standards to establish MicroPACS, (1) It must be available in Windows Operating System. (2) It must be free ware. (3) It must be compatible with PET/CT scanner. (4) It must be easy to use. (5) It must not be limited of storage capacity. (6) It must have DICOM supporting. 2. (1) To evaluate availability of data storage, we compared the time spent to back up data in the open source software with the optical discs (CDs and DVD-RAMs), and we also compared the time needed to retrieve data with the system and with optical discs respectively. (2) To estimate work efficiency, we measured the time spent to find data in CDs, DVD-RAMs and MicroPACS. 7 technologists participated in this study. 3. In order to evaluate stability of the software, we examined whether there is a data loss during the system is maintained for a year. Comparison object; How many errors occurred in randomly selected data of 500 CDs. Result: 1. We chose the Conquest DICOM Server among 11 open source software used MySQL as a database management system. 2. (1) Comparison of back up and retrieval time (min) showed the result of the following: DVD-RAM (5.13,2.26)/Conquest DICOM Server (1.49,1.19) by GE DSTE (p<0.001), CD (6.12,3.61)/Conquest (0.82,2.23) by GE DLS (p<0.001), CD (5.88,3.25)/Conquest (1.05,2.06) by SIEMENS. (2) The wasted time (sec) to find some data is as follows: CD ($156{\pm}46$), DVD-RAM ($115{\pm}21$) and Conquest DICOM Server ($13{\pm}6$). 3. There was no data loss (0%) for a year and it was stored 12741 PET/CT studies in 1.81 TB memory. In case of CDs, On the other hand, 14 errors among 500 CDs (2.8%) is generated. Conclusions: We found that MicroPACS could be set up with the open source software and its performance was excellent. The system built with open source proved more efficient and more robust than back-up process using CDs or DVD-RAMs. We believe that the operation of the MicroPACS would be effective data storage device as long as its operators develop and systematize it.

• Journal of the Korean Society for Nondestructive Testing
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• v.30 no.5
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• pp.471-478
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• 2010

Thin films play an important role in many technological applications including microelectronic devices, magnetic storage media, MEMS and surface coatings. It is well known that a thin film's material properties can be very different from the corresponding bulk properties and thus there has been a strong need for the development of a reliable test method to measure the mechanical properties of a thin film. We have developed an alternative and convenient test method to overcome the limitations of previous membrane deflection experiment and uniaxial tensile test by adopting a white light interferometer having sub-nanometer out-of-plane displacement resolution. The freestanding aluminium specimens are tested to verity the effectiveness of the test method developed and get the tensile properties. The specimens are 0.5 rum wide, $1{\mu}m$ thick and fabricated through MEMS processes including sputtering. 1 to 5 specimens are fabricated on Si dies. The membrane deflection experiments are carried out by using a homemade tester consisted of a motor-driven loading tip, a load cell, and 6 DOF alignment stages. The test system is compact enough to set it up beneath a commercial white light interferometric microscope. The white light fringes are utilized to align a specimen with the tester. The Young's modulus and yield point stress of the aluminium film are 62 GPa and 247 MPa, respectively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.12
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• pp.339-344
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• 2016

Since transmissions of large amounts of data are frequent, users require more bandwidth, and the need for communications networks having greater bandwidth is increasing. One communications network satisfying this need is an optical communications network. Therefore, studies to increase the transmission capacity of optical communications systems have been carried out. However, in a general optical communications system, a signal transmitted through optical fiber (a transmission medium) is detected through direct detection in the receiving system. This method has a disadvantage in that the entire bandwidth of the optical signal cannot be utilized. Also, when transmitting an optical signal, there is a problem where the signal-to-noise ratio is affected by neighboring channels. To overcome this situation, various studies are being conducted to minimize the influence of external interference and noise. This paper overcomes the situation by transmitting spectrum-sliced signals using the digital transmission system, FSK. Analyzing the characteristics of the signals detected in the receiver of the optical communications system, Gaussian distribution is used for the PDF of the spectrum-sliced signal, and the signal at the receiving end of the optical communications system is assumed to have a k-square distribution. The results of the analysis confirmed it is better to transmit the spectrally divided signal rather than transmit the laser source.

• Journal of Adhesion and Interface
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• v.14 no.2
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• pp.57-67
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• 2013

The incompletion of TIR (Total Internal Reflection) in FTIR (Frustrated Total Internal Reflection) touch screen has been investigated as follows. Assuming a 3 layer thin film of medium1 ($n_1$)-medium2 ($n_2$)-medium3 ($n_3$) with refraction indices of $n_1=n_3{\neq}n_2$, it was theoretically proven that FTIR or OT (ordinary transmission) phenomena might happen through medium2 from medium1 to medium3 relying on relative difference in $n_1(=n_3)$ and $n_2$, and that the formulae for FTIR and OT could be transformed into each other depending on the number state (imaginary or real) of the light wave phase. In parallel to the theoretical analysis, the incompletion of TIR in acrylate due to external contacts was also elucidated from the experimental and phenomenological viewpoints. On the basis of this considerate work, we explained how to improve the touching performance for better FTIR touch screen.

• Proceedings of the Korean Society for Emotion and Sensibility Conference
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• 2009.11a
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• pp.214-217
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• 2009

현대 패션분야에서 디자이너들의 예술적 표현의 주제이자 매체로서 활용되고 있는 빛은 보다 감성지향적인 방향으로 발전되는 추세로서, 빛을 활용한 감성 패션디자인에 대한 표현 방법과 조형적 특성을 분석하는 것은 매우 의미있는 일이다. 패션디자인에서 빛을 표현하는 방법으로는 빛의 반사, 이미지 표현, 발광, 투사에 의해 독창적으로 응용되어져 표현되어 왔으며, 다양한 빛의 표현을 위해 재료의 물성을 조작함으로써 얻을 수 있는 빛의 유희, 명암이나 형태, 색채를 통한 빛의 재현, 발광물질이나 인공광에 의한 발광, 프로젝터를 통한 빛 이미지 등 다양한 표현방법이 활용되고 있었다. 빛이 활용된 감성 패션디자인의 조형적 특성으로는 상호작용성, 영상성, 투명성, 실험성으로 분류되었다. 상호작용성은 착용자의 행위에 의한 변형과 신체의 변화나 감정의 변화에 의한 불빛이나 영상 패턴이 바뀌는 등 형태나 컬러, 영상의 변형 등 착용자의 메시지 전달이나, 감정표현, 신체보호, 그리고 재미를 유발하는 효과를 자아내는 것으로 나타났다. 영상성은 디지털 이미지를 활용한 것과 내부 광원에 의한 발광성으로 분류되며, 드레스에 장착된 수많은 LED 에 의한 영상을 만들거나 이미지를 확대시키는 방법으로 표현된 영상성은 심미적인 효과가 우선시되었다. 투명성은 주로 비닐, 플라스틱, 기능적 소재 등 투명한 소재들을 이용하여 대부분 재료의 특성이 조형적 특성으로 분석되었고, 외부와의 개방성과 위장가능성의 효과를 준다거나, 투명한 재질에 이미지가 변화하는 이미지의 중첩성과 같은 효과를 나타내었다. 실험성은 새로운 실험적 도구로서의 패션을 표현하고자 할 때, '빛'을 매개체로 하여 관심을 유도하고 재미를 더해주며, 신비주의적 환상이나 호기심을 불러일으키는 효과를 나타내었다. 이처럼 빛을 활용한 패션디자인은 빛을 매개체로 하여 다양한 표현방법으로 활용이 가능하며 특유의 조형적 특성을 가지고 있음을 알 수 있었다.

• Journal of the Korean Graphic Arts Communication Society
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• v.30 no.3
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• pp.23-33
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• 2012

We studied simultaneously the electronically written data affected in the use of thermal transfer discs and the recoding strategy between recoding drives for the stable long term preservation of optical discs which are commonly used in an electronic data storage device. The most important thing in the archiving preservation might be a choice of a device, however the use of thermal transfer recording discs is not good for long term data preservation because the thermal effect on the recoding data is critical which means that the data are recorded not under best condition but under bad condition. We inspect the strategies of recoding data from 12 brands of optical discs and drives of 7 brands and it turns out the recoding strategy is needed first for the long term preservation of electronic recording data. Thus, without affecting data quality and deformation of optical discs, the choice of optimal disc and drive in recoding data will be a solution for the long term preservation of recoding data.