• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.27 no.1
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• pp.45-49
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• 2014

We have fabricated white organic light-emitting diodes (OLEDs) using several thicknesses of electron-transport layer. The multi-emission layer structure doped with red and blue phosphorescent guest emitters was used for achieving white emission. 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP) was used as an electron-transport layer. The thickness of BCP layer was varied to be 20, 55, and 120 nm. The current efficiency, emission and recombination characteristics of multi-layer white OLEDs were investigated. The BCP layer thickness variation results in the shift of emission spectrum due to the recombination zone shift. As the BCP layer thickness increases, the recombination zone shifts toward the electron-transport layer/emission-layer interface. The white OLED with a 55 nm thick BCP layer exhibited a maximum current efficiency of 40.9 cd/A.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.46
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• pp.181-210
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• 2010

The continuing advance of multimodal transport with the importance for efficient and effective logistics management emphasizes the need for uniform legal approach to international multimodal transport. However, the current fragmented instrument regulating such transport is being an obstacle to development of multimodal transport as it aggravates confusion and uncertainty. The Rotterdam rules, which was adopted in December 2008 by UNCITRAL, expands its scope of application to door-to-door transport. However, the new rules has some problems in its application to multimodal transport operation as it has been conceived not to regulate general multimodal carriage but to regulate contract of carriage by sea that extends its services to the transport by other modes. This article examines conflict of conventions in the Rotterdam Rules. The applicability of the Rotterdam Rules in international multimodal transport contract and possibility of potential conflict with other transport conventions are analyzed with some hypothetical cases. Furthermore, problems arising from application of the Rotterdam Rules under international multimodal transport Contracts are indicated in the chapter IV.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2014.06a
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• pp.215-220
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• 2014

The report analyze the current situation of shipping industry in Viet Nam, including information about Viet Nam seaborne trade, shipping companies, sea-going fleets, seafarers, major seaports. Afterward it will be disclosed the policy of sea transport in Viet Nam. And finally, the author will give summary and conclusion about shipping industry in Viet Nam.

• 한국초전도학회:학술대회논문집
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• 2009.07a
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• pp.105-105
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• 2009

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.02a
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• pp.55-57
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• 2003

In this paper, we described the procedures of AC transport current loss in HTS tape. To carry out the calculation, A-$\Phi$ formulation was introduced and two dimensional FEM was used for computation. The results were showed that ellipse shape was higher loss compared to rectangle one and these were almost same behavior of analytical results predicted by Norris. A comparative analysis of loss for various n-value variation was also presented.

• Korean Journal of Materials Research
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• v.26 no.8
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• pp.412-416
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• 2016

The electrical properties of Au/n-type Ge Schottky contacts with different contact areas were investigated using current-voltage (I-V) measurements. Analyses of the reverse bias current characteristics showed that the Poole-Frenkel effect became strong with decreasing contact area. The contribution of the perimeter current density to the total current density was found to increase with increasing reverse bias voltage. Fitting of the forward bias I-V characteristics by considering various transport models revealed that the tunneling current is dominant in the low forward bias region. The contributions of both the thermionic emission (TE) and the generation-recombination (GR) currents to the total current were similar regardless of the contact area, indicating that these currents mainly flow through the bulk region. In contrast, the contribution of the tunneling current to the total current increased with decreasing contact area. The largest $E_{00}$ value (related to tunneling probability) for the smallest contact area was associated with higher tunneling effect.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.24
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• pp.73-104
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• 2004

This paper intends to prevent dangerous goods shipments from compromising safety, and to minimize the risks to life and property inherent in air transport of dangerous goods. For this purpose, this paper reviews the changes of international standards for the international air transport of dangerous goods, and recommends the methods for improving the management system for the air transport of dangerous goods. As for the research methodology, this paper reviews the current regulations of the ICAO Technical Instructions for the Safe Transport of Dangerous Goods, IATA Dangerous Goods Regulations, and national regulations governing the air transport of dangerous goods in Korea. As the results of this paper, it is anticipated that the national regulations for shipping dangerous goods by air will be detailed, and compliance with the regulations will be enforced. In conclusion, ensuring the safe transport of dangerous goods by air is a shared responsibility of the government authorities, carriers and shippers.

• Korean Journal of Geomatics
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• v.4 no.2
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• pp.53-57
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• 2004

Due to the traffic congestion and public-oriented transportation policies of Seoul, public transportation is receiving attention and being used increasingly. However, current transport routes configuration is showing unbalanced accessibility throughout the city area creating differences in time, expenses and metal burden of users who travel the same distances. One of the reasons is that transport route planning has been partially empirical and non-quantitative tasks due to lack of relevant methods for assessing the complexity of the transport routes. This paper presents a method to compute the connectivity of public transport system based on the topological structure of the network of transport routes. The main methodological issue starts from the fact that the more transfers take place, the deeper the connectivity becomes making that area evaluated as less advantageous as for public transport accessibility. By computing the connectivity of each bus or subway station with all others in a city, we can quantify the differences in the serviceability of city areas based on the public transportation. This paper is based on the topological interpretation of the routes network and suggests an algorithm that can automate the computation process. The process is illustrated using a simple artificial network data built in a GIS.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.08a
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• pp.311-312
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• 2010

The fabricated photovoltaic cells based on PIN heterojunctions, in this study, have a structure of ITO/poly(3, 4-ethylenedioxythiophene)-poly(styrenesulfonate)(PEDOT:PSS)/donor/donor:C60(10nm)/C60(35nm)/2, 9-dimethyl-4, 7-diphenyl-1, 10-phenanthroline(8nm)/Al(100nm). The thicknesses of an active layer(donor:C60), an electron transport layer(C60), and hole/exciton blocking layer(BCP) were fixed in the organic photovoltaic cells. We investigated the performance characteristics of the PIN organic photovoltaic cells with copper phthalocyanine(CuPc), tetracene and pentacene as a hole transport layer. Discussion on the photovoltaic cells with CuPc, tetracene and pentacene as a hole transport layer is focussed on the dependency of the power conversion efficiency on the deposition rate and thickness of hole transport layer. The device performance characteristics are elucidated from open-circuit-voltage(Voc), short-circuit-current(Jsc), fill factor(FF), and power conversion efficiency($\eta$). As the deposition rate of donor is reduced, the power conversion efficiency is enhanced by increased short-circuit-current(Jsc). The CuPc-based PIN photovoltaic cell has the limited dependency of power conversion efficiency on the thickness of hole transport layer because of relatively short exciton diffusion length. The photovoltaic cell using tetracene as a hole transport layer, which has relatively long diffusion length, has low efficiency. The maximum power conversion efficiencies of CuPc, tetracene, and pentacene-based photovoltaic cells with optimized deposition rate and thickness of hole transport layer have been achieved to 1.63%, 1.33% and 2.15%, respectively. The photovoltaic cell using pentacene as a hole transport layer showed the highest efficiency because of dramatically enhanced Jsc due to long diffusion length and strong thickness dependence.

• Journal of the Korean Society of Physical Medicine
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• v.9 no.2
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• pp.133-140
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• 2014

PURPOSE: The purpose of this study was to compare the effect of current density on penetration depth, tissue concentration and transdermal transport of methylene blue(MB) by iontophoretic transdermal delivery. METHODS: Twenty-four male Sprague-Dawley rats were randomly divided into 1 mA($0.11mA/cm^2$), 2 mA($0.22mA/cm^2$), 4 mA($0.44mA/cm^2$), and 8 mA($0.89mA/cm^2$) groups. These rats were exposed to anodic iontophoresis of 1% MB using a direct current for 15 minutes. The penetration depth were measured using light microscopy from cryosections of skin tissue. The tissue concentration and transdermal transport were measured using biochemical analysis from target skin tissues. The data were analyzed with one-way analysis of variance. RESULTS: The significant differences in the penetration depth, tissue concentration and transdermal transport were detected among the groups(p<.001). Post hoc comparisons of the penetration depth, tissue concentration and transdermal transport of he 2 mA, 4 mA, and 8 mA iontophoresis groups were greater than in the 1 mA iontophoresis group(p<.05). There was no significant difference, however, among 2 mA, 4 mA, and 8 mA iontophoresis group. CONCLUSION: There was no difference in the efficiency of iontophoresis from 2 mA($0.22mA/cm^2$) to 8 mA($0.89mA/cm^2$). Higher current density can cause skin injury and discomfort sensation. In general, $0.5mA/cm^2$ is proposed to be the maximum iontophoretic current which should be used on human. The appropriate current amplitude should be selected by considering the safety current density and the depth of the target tissue.