• The Journal of Information Technology and Database
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• v.3 no.2
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• pp.39-51
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• 1996

CORBA는 분산 시스템의 객체를 관리하기 위한 모형으로 여러 응용에서 장점을 보인다. 그러나 CORBA 객체의 정의에는 지속성을 가정하고 있지 않다. 본 논문에서는 CORBA의 BOA(Basic Object Adapter)에 객체 데이타베이스 어댑터(Object Database Adapter, ODA)를 구현하여 객체를 관계 데이타베이스에 저장함으로써 객체의 지속성을 유지하도록 하였다. 객체의 관리는 객체지향 데이타베이스 시스템이 자연스러우나 본 논문에서는 이미 구축된 관계 데이타베이스 시스템과 응용을 공유할 수 있도록 관계 데이타베이스용을 구현하였다. ORB는 Orbix를 사용하였고, 튜플의 객체로의 대응은 Tie 법과 객체포장기 개념을 사용하였다. CORBA 응용의 관점에서 데이타베이스 시스템을 이용한 객체의 지속성 유지는 지속성 유지와 더불어 많은 수의 객체를 효율적으로 관리할 수 있고, 병행성, 회복기법 등을 이용할 수 있는 여러 장점이 있다. 또 데이타베이스 시스템 측면에서 CORBA와 데이타베이스 어댑터의 이용은 사용자에게 데이타베이스 스키마에 관한 사항을 숨김으로써 데이타베이스 접근을 쉽게 하고, 분산된 데이타베이스 환경에서는 데이타베이스 모델과 언어의 이질성을 해소할 수 있는 장점이 있다.

• The Journal of Society for e-Business Studies
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• v.1 no.1
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• pp.159-171
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• 1996

Nowadays, multimedia and Hypermedia become hot topics in information industry. Due to high capacity of media storage and fast communication network, it is possible to exchange text data as well as image, moving picture and voice. Especially to apply hypermedia under CALS standard environment, the relation between international standard and CALS standard needs to be considered. This study introduces conceptual background and processing model of HyTime (Hypermedia Time-based Structuring Language) which is a specification of hypermedia exchange, Hyper ODA (Hyper Open Document Architecture) which is a major multimedia communication basis, MMCF (Multimedia Communication Forum), AHM(Amsterdam Hypermedia Model), and DSRM(DAVIC System Reference Model) reference model which helps determination of hypermedia communication specification Although they are international standard, provisional standard or non-standard, it discusses the Possibility of adopting them as CALS standard. Hence, this paper chooses the best recommend for CALS among these models.

• Journal of the Korean Mathematical Society
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• v.43 no.5
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• pp.1047-1063
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• 2006

Let $\varepsilon_#(X)$ be the subgroups of $\varepsilon(X)$ consisting of homotopy classes of self-homotopy equivalences that fix homotopy groups through the dimension of X and $\varepsilon_*(X) $ be the subgroup of $\varepsilon(X)$ that fix homology groups for all dimension. In this paper, we establish some connections between the homotopy group of X and the subgroup $\varepsilon_#(X)\cap\varepsilon_*(X)\;of\;\varepsilon(X)$. We also give some relations between $\pi_n(W)$, as well as a generalized Gottlieb group $G_n^f(W,X)$, and a subset $M_{#N}^f(X,W)$ of [X, W]. Finally we establish a connection between the coGottlieb group of X and the subgroup of $\varepsilon(X)$ consisting of homotopy classes of self-homotopy equivalences that fix cohomology groups.

• Environmental and Resource Economics Review
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• v.7 no.1
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• pp.119-150
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• 1997

1990년 동북아 23개 지역의 이산화황 총배출량은 14.7백만톤이었다. 이중 중국동북부가 81%, 한국이 12%, 일본이 5%, 그리고 북한이 2%를 배출하였다. 기본시나리오하에서 동북아지역의 이산화황 배출은 2020년에 40.5백만톤에 이를 것으로 추정되고 있다. 중국에서 배출된 장거리 월경성 대기오염물질은 한반도와 일본으로 이동하며 특히 산성강우는 중국으로부터의 이산화황 배출에 크게 영향을 받고 있다. 산성강우는 자연생태계와 농작물에 피해를 줄 뿐 아니라 인간의 건강에도 심각한 피해를 준다. 따라서 미래의 산성강우 피해를 줄이기 위해서는 자국뿐 아니라 인접국의 이산화황 및 질소산화물 배출도 함께 감소되어야 한다. 동북아지역 국가들은 경제발전단계 및 환경협력 논의에서의 우선순위가 다르기 때문에 가까운 시일내에 환경협력을 위한 다자간 협약을 체결하기는 어려울 것이다. 따라서 ESCAP, APEC 등 기존의 지역협력기구를 이용하거나 IBRD, ADB 등의 다자간 외부금융기관이나 공적개발원조 (ODA) 등을 통해 개선된 환경기준을 준수하도록 하고 지역환경개선을 위한 협력사업을 추진하는 것이 바람직하다. 또한 산성비와 관련한 동북아 환경협력은 과학적 조사를 통해 객관적이고 신뢰할만한 정보를 획득하는 것으로부터 시작하여 단계적으로 추진되어야 하며, 정치, 경제, 과학, 외교 등 여러 분야에 걸쳐 중앙정부 뿐만 아니라 지방정부와 NGO도 포함하는 다차원적, 포괄적으로 추진되어야 한다.

• Journal of the Korean Applied Science and Technology
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• v.19 no.4
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• pp.335-338
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• 2002

A new process for polymeric gate insulator in field-effect transistors was proposed. Fourier transform infrared absorption spectra were measured in order to identify ODPA-ODA polyimide. Its breakdown field and electrical conductivity were measured. All-organic thin-film transistors with a stacked-inverted top-contact structure were fabricated to demonstrate that thermally evaporated polyimide films could be used as a gate insulator. As a result, the transistor performances with evaporated polyimide was similar with spin-coated polyimide. It seems that the mass-productive in-situ solution-free processes for all-organic thin-film transistors are possible by using the proposed method without vacuum breaking.

• Proceedings of the KSRS Conference
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• 2004.10a
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• pp.570-573
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• 2004

We proposed a new system to collect hyperspectral data using a general cargo crane. The system has advantageous characteristics for precise data collection and analysis. In order to evaluate the validity, we performed the system on actual rice paddy field and analyzed the observed data. On the process, we could successfully extract the pure vegetation spectrum with high stability. The data taken by the system are useful for detail analysis among fields. In future development, it can be used for obtaining the grand truth for calibrating satellite or aerial hyperspectral images.

• Journal of Korean Vacuum Science & Technology
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• v.6 no.1
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• pp.51-54
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• 2002

Polymer EL devices of glass/ITO/PI/MEH-PPV/Al structure were fabricated using spin coating and the Ionized Cluster Beam deposition technique. PMDA-ODA type thin polyimide films which can be used as a impurity blocking layer of EL device were deposited by ICB. According to our previous results, the packing densities of polyimide films were subject to change and depend on their deposition condition. By inserting a Pl layer with various thickness and packing density, I-V characteristics and life time of the devices were investigated to determine the role of a interlayer. The blocking of impurity diffusion from ITO to luminescent layer were confirmed by XPS.

• Proceedings of the Materials Research Society of Korea Conference
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• 1992.05a
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• pp.6-6
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• 1992

Ionized cluster beam deposition (ICBD) technique has been employed to fabricate high-purity crystalline polyimide (PI) film. The pyromellitic dianhydride (PMDA) and oxydianiline (ODA) were deposited using dual ICB sources, Fourier trans forminfraredspectroscopy (FT-IR), X-ray photoemission spectroscopy (XPS), and Transmission electron microscopy (TEM)study show that the bulk and surface chemical properties and the crystalline structure are very sensitive to the ICBD conditions such as cluster ion acceleration voltage and ionization voltage, At optimum ICBD conditions, the PI films have a maximum imidization, negligible impurities(∼1% isoimide), and a good crystalline structure probably due to the high surface migration energy and surface cleaning effect. These characteristics are superior to those of films deposited by other techniques such as colvent cast, vapowr deposition, or sputtering techniques.

• IMMUNE NETWORK
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• v.9 no.2
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• pp.41-45
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• 2009

Activating and inhibitory cell surface receptors play important roles in regulation of immune responses. Recent progress has demonstrated that many inhibitory receptors pair with activating, as well as inhibitory, isoforms, both of whose genes are located in small clusters on a chromosome. We and others identified paired activating and inhibitory immunoglobulin-like receptors, designated myeloid-associated immunoglobulin-like receptors (MAIR) (CD300). MAIR is a multigene family consisting of nine genes on a small segment of mouse chromosome 11. MAIR family receptors are preferentially expressed on myeloid cells, including macrophages, dendritic cells, granulocytes, and bone-marrow-derived cultured mast cells, and a subset of B cells and regulate activation of these cells. Thus, MAIR plays an important role in innate immunity mediated by myeloid cells.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.12
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• pp.2624-2630
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• 2002

Organic/inorganic hybrid materials have rapidly become a fascinating research field. In this study, $polyimide/TiO_2$ composites were synthesized from nano-sized anatase $TiO_2$ and two types of polyimide, that is, BPDA-PPD and PMDA-ODA. Nano-sized $TiO_2$ particles were prepared from $TiOEt_4$ solution by the sol-gel method. The synthesized PI/$TiO_2$ composites were characterized by using XRD, TGA, FT-IR, TEM, and Atomic Force Microscope(AFM). $TiO_2$ particles were dispersed well in polyimides and the mechanical and thermal stability of polyimide was improved with $TiO_2$ nano particles.