• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.07a
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• pp.463-466
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• 2001

This detailed study of electrical, crystallographic and optical properties in Al doped ZnO thin films prepared by Facing Targets Sputtering(FTS), where strong internal magnets were contained in target holders to confine the plasma between the targets is described. Optimal transmittance and resistivity was obtained by controlling flow ratio of O$_2$gas. When the O$_2$ gas ratio of 0.25 and substrate temperature R.T., ZnO:Al thin film deposited had strongly oriented c-axis and the lower resistivity ( <10$\^$-4/ $\Omega$cm). The optical transmittance was above 80% in visible range.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11b
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• pp.112-116
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• 2001

Organic Electroluminescence device, which have the single-layer structure of ITO(indium-tin-oxide)/MEH-PPV (Poly[2-(2'-ethylhexyloxy )-5-methoxy-1,4-pheny lenevinylene])/Al(aluminium) and ITO/MEH-PPV/$Alq_3$(tris-8-hydroxyquinolinato aluminium)/Al were fabricated and electrical properties were investigated. Experimental results, in single-layer structure, shown that turn on voltage is about 12 V, and current density increases as a function of increasing temperature. It was explained by thermionic emission. In double-layer structure, thickness $200\AA$ of $Alq_3$ is shown electrical properties that turn on voltage is about 11 V, and current density decreases as a function of increasing temperature.ࠀȀ 耀Ѐ€

• Proceedings of the Korea Information Processing Society Conference
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• 2001.04b
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• pp.913-916
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• 2001

최근 정보화의 추세를 보면 인터넷의 사용이 다양하게 발전하고 있다. 회사간에 정보 인프라를 통해서 거래를 할 수 있는 e-Catalog의 필요성도 급속하게 대두하게 되었으며 e-Catalog는 단순한 상품 전시 수준에서 벗어나 기업활동 전반에 걸친 XML 기반의 B2B e-비즈니스로 확대되어 가고 있다. 한 걸음 더 나아가 e-비즈니스는 앞으로 전 세계의 모든 영역으로 급속히 확산될 것으로 예상된다. 따라서 XML 기반의 B2B e-Catalog가 미치는 전자상거래상의 파급효과를 검토하고, Java를 활용한 XML 기반의 B2B e-Catalog의 관점에서 기존의 Catalog를 재조명해보는 것이 필요하다고 본다. 논문에서는 특히 기업과 공공부문 상품에서의 XML 기반의 e-Catalog 유용성에 대해 논의하려고 한다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.14 no.3
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• pp.234-240
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• 2001

Using RF magnetron sputtering, amorphous carbon(a-C) thin films as electron filed emitter were fabricated. these a-C thin films were deposited on Si(001) substrate at several temperatures. The field electron emission property of these a-C thin films was estimated by a diode technique. As the result, we observed that the field emission properties of the films were changed singnificantly with the substrate temperature and structural features of a-C film. The field emission properties were promoted by higher substrate temperatures. Furthermore N-doped a-C film exhibits more field emission property than that of undoped a-C film. These results are explained as change of surface morphology and structural properties of a-C film.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.05c
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• pp.204-207
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• 2001

HWE 법으로 전 영역의 ZnMnTe 단결정 박막을 성장하였다. 상온 반사 스펙트럼으로부터 상온에서의 에너지 띠 간격이 Mn 조성비 증가에 따라 선형적으로 증가함을 알았다. 외부 자기장이 없는 10 K에서의 photoluminescence 스펙트럼에서 엑시톤 관련 near edge emission과 큰 조성비에서 지배적인 inta-$Mn^{2+}$ transition($^4T_1{\rightarrow}^6A_1$)을 관측하였다. edge emission은 조성비에 따라 선형적이고, intra-ion transition은 거의 변화가 없었다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.05c
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• pp.208-211
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• 2001

Hot wall epitaxy 법으로 GaAs(100) 기판 위에 $Zn_{1-x}Mn_xTe(0{\leq}x{\leq}1)$ 단결정 박막을 성장하였다. XRD 스펙트럼으로부터 $Zn_{1-x}Mn_xTe$ epilayer들이 전 영역에 걸쳐 zincblende 구조임을 알았다. double crystal rocking curve(DCRC)로부터 격자상수를 계산하고 이훌 이용하여 조성비를 계산하였다. ZnMnTe 단결정 박막의 DCRC 반치폭은 Mn 조성비가 증가함에 따라 급격하게 증가하다가 포화되는 모습을 나타내었다

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.14 no.9
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• pp.762-767
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• 2001

We report the white light emission from the multilayer organic electroluminescent(EL) device using exciplex emission. The exciplex at 500nm originated between poly(N-vinylcarvazole)(PVK) and 2,5-bis(5'-tert-butyl-2-benzoxazoly)thiophene(BBOT) and exciplex of 50nm originated from N,N'-diphenyl-N,N'-(3-methyphenyl)-1,1'-biphenyl-4,4'-diamine(TPD) and BBOT were observed. Also, the energy transfer from PVK to BBOT and poly(3-hexylthiophene)(P3HT) in mixed emitting materials was occurred. The electroluminescence(EL) spectra of organic EL device which have a device structure of ITO/CuPc(5nm)/emitting layer(100nm)/BBOT(30nm)/LiF(1.4nm)/Al(200nm) were slightly changed as a function of the applied voltage. The luminance fo 12.3 ${\mu}$W/$\textrm{cm}^2$ was achieved at 20V and EL spectrum measured at 20V corresponds to Commission Internationale de L\`Eclairage(CIE) coordinates of x=0.29 and y=0.353.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2001.11a
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• pp.112-116
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• 2001

Organic Electroluminescence device, which have the single-layer structure of ITO(indium-tin-oxide)/MEH-PPV (Poly [2-(2'-ethylhexyloxy)-5-methoxy-1, 4-phenylenevinylene])/Al(aluminium) and ITO/MEH-PPV/Alq$_3$(tris-8-hydroxyquinolinato aluminium)/Al were fabricated and electrical properties were investigated. Experimental results, in single-layer structure, shown that alum on voltage is about 12 V, and current density increases as a function of increasing temperature. It was explained by thermionic emission. In double-layer structure, thickness 200 $\AA$ of Alq$_3$ is shown electrical properties that turn on voltage is about 11V, and current density decreases as a function of increasing temperature.

• Journal of Advanced Marine Engineering and Technology
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• v.25 no.5
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• pp.1148-1160
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• 2001

An electronic control system of the automobile engine for optimal start and idle speed control has been developed. This system employs the microcoputer-based electronic control unit and crank angle sensor for precise control on fuel injection, ignition timing, and idle speed more quickly and accurately at the start and idling. Consequently, the number of misfire can be reduced during been affected by air flow rate, idle quality(roughness), spark timing, fuel injection, water temperature, and load, Thus, this electronic control system strivers to reach the optimal idle operating point, defined the lowest idle speed(fuel economy) and idle quality(roughness), under any engine operating conditions.

• The Journal of Information Technology
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• v.4 no.2
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• pp.1-23
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• 2001

The purpose of this paper is to study the send and receive of the Message in the Bolero System. Bolero System is the business processes and methods, together with the digital information system, which are provided by Bolero International for communicating Messages and Documents and facilitating business transactions, as well as the Bolero Rulebook and Operating Rules governing their use. The advantage of bolero.net include speed, cost and efficiency. First, bolero.net moves cirtical information and transactions more quickly than paper can move. Second, a message costs much less to transmit through bolero.net than via couriers and other paper means. Third, because bolero.net logs and tracks all transactions centrally, less data gets lost and fewer data entry errors occur. Bolero International is the certifier for all certificates used in the Bolero System at present. It takes significant responsibility and liability for the certificates that it issues in each Operational Service Contract. In the future, Bolero International may devolve the task of serving as certifier to one or more other qualified institutions.