• 종축개량
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• v.12 no.6 s.76
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• pp.77-79
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• 2007

• The monthly packaging world
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• s.79
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• pp.103-106
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• 1999

• 보일러설비
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• s.111
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• pp.88-93
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• 2003

• Product Safety
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• s.122
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• pp.33-35
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• 2004

• Product Safety
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• s.122
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• pp.40-43
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• 2004

• Proceedings of the KIEE Conference
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• 2001.11a
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• pp.161-164
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• 2001

Transmuted impurity atoms formed in neutron-irradiated ZnO thin films were theoretically identified first and then experimentally confirmed by Photoluminescence (PL). ZnO thin films grown by plasma-assisted molecular beam epitaxy were irradiated by neutron beam at room temperature. Among eight isotropes naturely exiting in ZnO films, only $^{64}Zn$, $^{68}Zn$, $^{70}Zn$ and $^{18}O$ were expected to transmute into $^{65}Cu$, $^{69}Ga$, $^{71}Ga$ and $^{19}F$, respectively. The concentrations of these transmuted atoms were estimated by considering natural abundance, neutron fluence, and neutron cross section. The neutron-irradiated ZnO thin films were characterized by PL. In the PL spectra of these ZnO thin film, the Cu-related PL peaks were seen, but the Ga- or F-associated PL peaks were absent. This observation demonstrates the existence of $^{65}Cu$ in the ZnO. In this paper, emission mechanism of Cu impurities wil1 be described and the reason for the absence of the Ga- or F-associated PL peaks will be discussed.

• Applied Science and Convergence Technology
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• v.24 no.4
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• pp.111-116
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• 2015

The graphene oxide (GO) and graphene oxide quantum dots (GOQDs), which have gained research interest as new types of light-emitting materials, were synthesized by the modified Hummers method for oxidation of graphite flake and graphite nanoparticle. The optical properties of GO and GOQDs have been compared by mean of photoluminescence (PL), PL excitation (PLE), UV-vis absorbance, and time-resolved PL. The GO have an absorption peak at 229 nm and shoulder part at 310 nm, whereas the GOQDs show broad absorption with a gradual change up without any absorption peaks. The PL emission of GOQDs and GO showed the green color at 520 nm and the red color at 690 nm, respectively. The red emission of GO showed faster PL decay time than the green emission of GOQDs. In particular, the temporal PL profile of the GO showed redshift from 560 nm to 660 nm after the pump event.

• LOGISTICS
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• s.20
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• pp.27-31
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• 2007

• East Asian Journal of Business Economics (EAJBE)
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• v.7 no.4
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• pp.15-26
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• 2019

Purpose - The purpose of this paper is to examine total logistics concept performed by 3^rd party logistics, managing with 4th party logistics to achieve more efficient and systematic dealing with sub-functions of physical distribution process. Research design and methodology - The research method to be adopted is first to review 3th party logistics providers that has attracted to various functions of 4PL, and then total logistics concept to be investigated which is related to 3 PL and 4 PL. Results - For the total logistics concept implemented by 3PL, management technique should be widen, then 3 PL's service activities and area should extend. Especially for the collaboration effects between the company and external organizations, it can be collaborated with some commitments in terms of their own independent activities, carrying on inherent functions by both 3PL and 4PL, pursuing total logistics concept. Conclusions - More areas of logistics service has been required by clients in the field, and service activities available is strongly related to roles of 3th party logistics providers as main player in logistics market. However, total logistics management is could be implemented by 3PL combining with various functions of logistics service offered by 4th logistics provider.

• Journal of Digital Convergence
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• v.18 no.5
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• pp.169-178
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• 2020

The selection of a third-party logistics (3PL) provider is a critical process for shippers who want to receive competitive logistics service. However, studies analyzing the factors that influence the selection of 3PL provider from the viewpoint of shippers are insufficient. The present study aims to derive factors to be considered when selecting a 3PL provider by domestic shippers and to present the weights of each factor. The analysis results showed that among the major factors, the "operation factor" showed the highest importance, followed by "strategic factor", and "communication factor". The results of compound weights showed that "cost reduction" is the most important factor, followed by the "expertise of the provider", "inventory management ability", and "human resources management". The present study proposed the core factors that should be considered when selecting a 3PL provider from the shipper's viewpoint. This study also has an industrial implication from the viewpoint of 3PL providers because it provides the basic data for enhancing the shipper's satisfaction by reinforcing the factors that are considered important in by shippers. In future research, it is necessary to classify shippers by industry and analyze the differences in the factors that arise in selecting 3PL companies for each industry.