• Journal of Korean Vacuum Science & Technology
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• v.6 no.2
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• pp.67-70
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• 2002

Multi-period low-emissivity (low-e) filters based on [TiO$_2$｜Ti｜Ag｜TiO$_2$] layer structure were designed and fabricated by a RF magnetron sputtering method. Optical, structural, chemical, and electrical properties were investigated with various analytical tools. Interface layers consisting of Ag, Ti, and O were observed next to Ag layers by Rutherford backscattering spectrometry (RBS) analysis. The results show that Ti layers of ~ 1.8 nm protect the Ag layers from oxidation better than those of ~ 1 nm and the optical spectra of the filter with thicker Ti layers are in agreement with the simulated one. The average transmittance of a low-e filter with thicker Ti layers is reduced and the sheet resistance is slightly increased due to the increased Ti thickness.

• Composites Research
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• v.24 no.1
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• pp.10-16
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• 2011

Many tests are required to predict the fatigue life of composite laminates made of various materials and having different layup sequences. Aiming at reducing the number of tests, a methodology was presented in this paper to predict fatigue life of composite laminates based on fatigue life prediction of constituents, i.e. the fiber, matrix and interface, using micromechanics of failure. For matrix, the equivalent stress model which is generally used for isotropic materials was employed to take care of multi-axial fatigue loading. For fiber, a maximum stress model considering only stress along fiber direction was used. The critical plane model was introduced for the interface of the fiber and matrix, but fatigue life prediction was ignored for the interface since the interface fatigue strength was presumed high enough. The modified Goodman equation was utilized to take into account the mean stress effect. To check the validity of the theory, the fatigue life of three different GFRP laminates, UDT[$90^{\circ}2$], BX[${\pm}45^{\circ}$]S and TX[$0^{\circ}/{\pm}45^{\circ}$]S was examined experimentally. The comparison between predictions and test measurements showed good agreement.

• The KIPS Transactions:PartD
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• v.8D no.1
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• pp.32-43
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• 2001

Due to the limitation of data modeling power and the view update ambiguity, relational view is limitedly used for engineering applications. On the contrary, object-oriented database view would playa vital role in defining custom interface for engineering applications because the above two limitations of the relational view are overcome by the object-oriented view. Above all, engineering application data interface should fully support updates. More specifically, updates against the data interface needs to be unambiguously defined and its semantic behavior should be equal to base schema updates'. For this purpose, we define the notion of update semantic preserving which means that view updates displays the same semantics as base schema. Besides, in order to show the feasibility of this characteristics, specific and concrete algorithms for update preserving updates are presented for a CAD specialized object-oriented database view - MultiView. This paper finds that in order that virtual classes coudld form a schema with 'isa' relationships rather than just a group of classes, the update semantics on the virtual classes should be defined such that the implied meaning of 'isa' relationships between classes are not to be violated. Besides, as its sufficiency conditions, we derived the update semantics and schema constituable conditions of the virtual classes that make view schemas look like base schemas. To my best knowledge, this is the first research that presents the sufficiency conditions by which we could defined object-oriented views as integrated schemas rather than as separate classes.

• Proceedings of the Korean Information Science Society Conference
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• 1999.10b
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• pp.137-139
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• 1999

본 논문에서는 보다 효과적이고 편리한 서비스를 제공할 수 있는 전자상거래를 위해 에이전트 기법을 유용하고 휴대형 장비를 이용해 상거래가 가능한 지능형 전자상거래 시스템을 제안한다. 제안한 시스템에서는 유.무선 인터넷 사용자는 통합 인터페이스를 통해 시스템에 접근하여 개인화된 에이전트를 생성하고, 이들 에이전트들이 거래과정에 지능적으로 참여함으로서 사용자의 직접적 간섭없이 거래가 이루어진다. 제안한 시스템은 다중(multi)의 에이전트로 구성되어 있으며, 각각의 에이전트는 Perl을 이용해 CGI(Common Gateway Interface)로 구현하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.1315-1318
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• 2006

모형 설계와 도형의 생성은 점, 곡선, 기울기과 같은 특정 속성들의 정보로 만들어 진다. 도형을 생성할 때 곡면 조각, 움직이는 곡선과 점, 일반적인 곡선, 연속 혹은 닫힌 곡선, 빠른 계산들은 중요하게 생각 되는 모델링 개념이다. 이 논문에서는 Attribute Based $Modeling^{TM}(A-B\;Modeling^{TM})$ surface을 사용하여 디자인을 디자인할 때 필요한 Multi-sided patch의 설계와 인터페이스를 구현하고자 한다.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2004.06a
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• pp.228-228
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• 2004

Nuclear Environment Technology Institute (KHNP-NETEC) developed the conceptual design of the low and intermediate-level radioactive waste (LILW) repository. Among many engineering challenges, it is of particular importance to find out an optimum arrangement of near-surface disposal vaults in the repository area to minimize the radionuclide flux and concentration at the interface between the geo-sphere and bio-sphere. (omitted)

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2004.10a
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• pp.1339-1343
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• 2004

This paper presents a development of the control algorithm and Pick & Placer. The Pick & Placer provides a powerful multi-task system that includes both graphical and remote interface. Users can easily set up sorting parameters and record important data including wafer number, data, and operator information. This System sets up a dustproof device and massively machined components to provide an extremely stable sorting environment. Precise resolution and accuracy result from using machine vision, a pneumatic slide drive and close -looped positioning.

• Proceedings of the KAIS Fall Conference
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• 2002.05a
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• pp.215-217
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• 2002

본 논문에서는 CM-MVL(Current Mode Multi-Valued Logic)을 이용한 Host와 LCD Controller 간에 인터페이스 회로를 제안한다. 제안한 회로는 기존의 LVDS(Low Voltage Differential Signaling)과 TMDS(Transition Minimized Differential Signaling)와 같은 전류 특성을 가지며, 3비트 동시 전송이 가능하여 동일한 전송 속도 하에서 보다 많은 데이터를 전송할 수 있다. 그리고 전류에 의한 데이터 전송을 통하여 노이즈에 강한 특성을 나타낸다. 제안한 회로는 HSPICE 시뮬레이션을 통해서 회로의 동작을 확인하였다.

• Proceedings of the Korea Society of Design Studies Conference
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• 2000.11a
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• pp.8-9
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• 2000

기존의 자동차 인테리어 디자인은 인간공학적이나 스타일링을 위주로 하는 경우가 많았다. 그러나 본 연구는 운전자의 '사용성' 이라는 측면에서 운전부를 중심으로 운행에 관계된 이그니션콘트롤(ignition control), 멀티펑션스위치(multi function switch)와 차량의 상태를 알려주는 클러스터게이지(cluster gauge)를 중심으로 조사해 보았다. (중략)

• Journal of the Optical Society of Korea
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• v.11 no.4
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• pp.145-148
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• 2007

In this paper, we discuss a study on Advanced TCA(ATCA) based 40 Gbps level Optical transport platform having 120 Gbps(12, 10 Gbps modules) switching capacity as an OTP based large capacity multi service technology. The ATCA-based OTP(Optical Transport Platform) is composed of OTH(Optical Transport Hierarchy) 10 or 40 Gbps client signal interface module, OTH 10 Gbps transport module, high-rate OTH unit switch, system processor, and can be installed in ATCA platform.