• 산업경영시스템학회지
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• 제31권2호
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• pp.112-121
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• 2008

Nowaday the supply chain competitiveness is emphasized more and more than a company's own competitiveness. One of the most important processes in import and export is a publication over the Bill of Loading. In the publication of those bills S/R(shipping request) and check B/L for reviewing are circulated among consignors, forwarders, shipping companies and airlines by fax and e-mail. Or there should be expensive a One to One system, like an EDI. Each party has to re-input S/R data to their own systems and check it several times. The S/R data are converted digital to analog type and analog to digital repeatedly to check in the process. As the process goes by there can be not only input data errors but also waste of time and cost. ECR(electronic character recognition) is a technology can solve the Problem. Considering the data structure of documents in many systems used ECR samples SIR data from documents written in the digital type. But it is not enough with it only. To make N to N composition in reality more efficient we make a documents hub on the web reengineering the existing process to One to One relation. The ECR documents hub system has given us beneficial effects over a year throughout a field test.

• Journal of the Optical Society of Korea
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• 제17권5호
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• pp.384-391
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• 2013

We propose a split-encryption scheme on converting original images to multiple ciphertexts. This conversion introduces one random phase-only function (POF) to influence phase distribution of the preliminary ciphertexts. In the encryption process, the original image is mathematically split into two POFs. Then, they are modulated on a spatial light modulator one after another. And subsequently two final ciphertexts are generated by utilizing two-step phase-shifting interferometry. In the decryption process, a high-quality reconstructed image with relative error $RE=7.6061{\times}10^{-31}$ can be achieved only when the summation of the two ciphertexts is Fresnel-transformed to the reconstructed plane. During the verification process, any silhouette information was invisible in the two reconstructed images from different single ciphertexts. Both of the two single REs are more than 0.6, which is better than in previous research. Moreover, this proposed scheme works well with gray images.

• 한국자동차공학회논문집
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• 제22권4호
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• pp.152-159
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• 2014

Urea solution as a reductant of SCR has been widely used to reduce NOx emissions from diesel engine. But it has lots of problems which are freezing at low temperature due to liquid state, deposition of solid formation in the exhaust, dosing device, and complex package such as mixers for uniform concentration of ammonia. In order to overcome these obstacle, ammonium carbonate which is one of solid ammonium materials to produce ammonia gas directly by sublimation process is considered. Simple reactor with visible widow was designed to predict equilibrium temperature and pressure of ammonium carbonate. To simulate real operation conditions under automobile environment, several cycles of heating and cooling condition were settled, two different re-solidification materials were extracted from the reactor and visible window. Analytical study is performed to characterize these unknown materials by XRD(X-Ray Diffraction), FT-IR(Fourier Transform Infrared Spectroscopy), and EA(Elemental Analyzer). From analytical results, re-solidification materials from heating and cooling cycles are very similar to original material of ammonium carbonate.

• 한국정보통신학회논문지
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• 제22권1호
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• pp.211-220
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• 2018

CCSDS가 제시하는 표준 데이터 링크 계층 암호화는 HDLC 프레임을 입력받고 이를 AES 알고리즘을 사용하여 암호화하는 구조를 가진다. 하지만 CCSDS의 표준 방식은 불안정한 채널을 통해 노이즈 간섭이 발생하는 경우 수신측 스스로 재동기 요청할 수 없는 구조를 가지고 있다. SES Alarmed는 CCSDS의 링크 암호화와 유사한 동작 구조에 추가적으로 수신측에서 오류를 감지하고 재동기 요청을 수행할 수 있는 구조를 가지고 있다. SES Alarmed와 관련된 논문은 최적의 임계범위를 발견하는 것과 채널 노이즈에 따른 데이터 손상을 확인하는 것에 목적을 두었다. 본 논문에서는 SES Alarmed에서 암호 동기 코드를 제외한 HDLC 프레임을 연속으로 임의의 임계값을 초과할 경우 재동기 과정을 낮추는 것에 초점을 두었다. 이에 HDLC 프레임 순서를 변경하고 SES Alarmed를 사용한 결과를 제안 및 비교한다.

• 한국분말재료학회지
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• 제12권5호
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• pp.357-361
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• 2005

Fe-doped skutterudite $CoSb_3$ with a nominal composition of $Fe_{x}Co_{4-x}Sb_{12}(0\;{\le}\;x\;{\le}\;2.5)$ has been synthesized by mechanical alloying (MA) of elemental powders, followed by hot pressing. Phase transformations during mechanical alloying and hot pressing were systematically investigated using XRD. Single phase skutterudite was successfully produced by vacuum hot pressing using as-milled powders without subsequent annealing. However, second phase in the form of marcasite structure $FeSb_2$ was found to exist in case of $x\;{\ge}\;2$, suggesting the solubility limit of Fe with Co in this system. Thermoelectric properties as functions of temperature and Fe contents were evaluated for the hot pressed specimens. Fe substitution up to x=1.5 with Co in $Fe_{x}Co_{4-x}Sb_{12}$ appeared to increase thermoelectric figure of merit (ZT) and the maximum ZT was found to be 0.78 at 525K in this study.

• 한국재료학회지
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• 제16권10호
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• pp.647-651
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• 2006

A new class of compounds in the form of skutterudite structure, Fe doped $CoSb_3$ with a nominal composition of $Fe_xCo_{4-x}Sb_{12}$ ($0{\leq}x{\leq}2.5$), were synthesized by mechanical alloying of elemental powders followed by vacuum hot pressing. Nanostructured, single-phase skutterudites were successfully produced by vacuum hot pressing using as-milled powders without subsequent heat-treatments for the compositions of $x{\leq}1.5$. However, second phase was found to form in case of $x{\geq}2$, suggesting the solubility limit of Fe with Co in this system. Thermoelectric properties including thermal conductivity from 300 to 600 K were measured and discussed. Lattice thermal conductivity was greatly reduced by introducing a dopant up to x=1.5 as well as by increasing phonon scattering in nanostructured skutterudite, leading to enhancement in the thermoelectric figure of merit. The maximum figure of merit was found to be 0.32 at 600 K in the composition of $Fe_xCo_{4-x}Sb_{12}$.

• 한국실내디자인학회논문집
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• 제16권6호
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• pp.19-27
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• 2007

As AEC(architecture, engineering and construction) industry becomes larger and more complex, much information is going into each part and phase. Therefore, the existing building design process has to change and collaboration is emphasized among participants in various fields. The purpose of this study is to compare and analyze existing building design process and integrated building design process based on BIM using a IDEF0 methodology. And then, it establishes a desirable domestic integrated building design process application plan focusing on the design phase of domestic cases. As a result of analysis, flowing conclusions are included ; Firstly, problems occur on the existing building design process that are accomplished with focusing on the outcome. It makes much errors because of 2D-based information. Another problems is that collaboration doesn't go on smoothly. But, integrated building design process is accomplished with the collaboration and the coordination which pursues change and perfects cooperation. Secondly, BIM is a process of effecting optimum integrating, re-using information, and expense reduction throughout the life-cycle of a building. Moreover, it establishes a basis for the integrated building design process to build a collaboration system.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 춘계학술대회
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• pp.238-240
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• 2014

클라우드 컴퓨팅은 소프트웨어를 서비스로서 사용할 수 있도록 하는 SaaS 프레임워크를 포함한다. 기존의 서비스가 있음에도 테넌트와 용도의 차이에 따라 서비스 제공자가 서비스를 다시 구축한다면 비용이나 관리적 측면에서 많은 자원을 요구하게 된다. 이에 우리는 기존 소프트웨어를 재사용 할 수 있도록 프로세스 알제브라를 이용하여 분석하는 기법을 제안한다. process algebra는 소프트웨어의 구조를 분석하고, 이를 비즈니스 프로세스나 다른 언어로 표현할 수 있으며, 재사용할 수 있는지 검증할 수 있다. process algebra 중 CCS(Calculus of Communicating Systems)는 비즈니스 프로세스나 XML로 변환하기 유용하므로, 이를 이용하여 프로세스를 구조화하고, 구조화된 명세를 비교 및 관리를 위한 메타 저장소를 제안한다.

• 한국정보통신학회논문지
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• 제18권6호
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• pp.1375-1380
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• 2014

클라우드 컴퓨팅에서 SaaS는 소프트웨어를 서비스로서 제공하는 프레임워크이다. 테넌트와 용도의 차이에 따라 서비스 제공자가 서비스를 다시 구축한다면 비용이나 관리적 측면에서 많은 자원을 요구하게 된다. 이에 우리는 기존 소프트웨어를 재사용 할 수 있도록 프로세스 알제브라를 이용하여 분석하는 기법을 제안한다. process algebra는 소프트웨어의 구조를 분석하고, 이를 다른 언어로 표현할 수 있으며, 재사용할 수 있는지 검증할 수 있다. process algebra 중 CCS(Calculus of Communicating Systems)는 비즈니스 프로세스나 XML로 변환하기 유용하므로, 이를 이용하여 프로세스를 프로세스 뷰로 구조화하고, 구조화된 명세를 비교 및 관리를 위한 메타 저장소를 제안한다.

• 대한기계학회논문집B
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• 제39권11호
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• pp.891-896
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• 2015

본 연구는 탄성지지된 단독원기둥의 후류에 관한 실험적연구이다. 본 실험은 $1.4{\times}10^4{\leq}Re{\leq}3.2{\times}10^4$의 레이놀즈수 범위에서 이루어졌으며, 원기둥 후류의 위치별 유속을 측정하여 후류에서 발생되는 와류의 생성에서 소멸까지의 과정 및 와류의 이동 궤적을 조사한 연구이다. 아울러 강제진동실험장치를 이용한 가시화실험을 통하여 풍동실험에서의 결과를 증명하였다. 그 결과 다음과 같은 결과를 얻었다. 1) 흐르는 유체에 존재하는 원기둥의 후류에 생성되는 와류의 생성${\rightarrow}$성장${\rightarrow}$소멸 과정을 확인 할 수 있었다. 2) 와류의 퍼짐각도는 $16^{\circ}{\sim}17^{\circ}$가량으로 주류속의 변화와 유력진동의 유무에 상관없이 일정하다. 3) 후류에서 변동 유속의 스펙트럼 분석을 통해 와류의 중심이 이동하는 궤적을 유추할 수 있었고, 가시화 실험을 통해 그것을 확신할 수 있다.