• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2015.11a
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• pp.196-197
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• 2015

ZnSe의 전기화학적 거동은 각각 다른 pH를 갖는 전해질에서의 linear sweep voltammogram 분석에 의해 체계적으로 고찰되었다. 제어된 조성을 갖는 칼코지나이드 ZnSe 박막이 complexing agent의 역할을 하는 citrate를 포함한 알카리 용액에서 전해 증착되었다. 다른 pH의 전해질에서 증착된 ZnSe 박막의 형상을 분석하고, 추가적으로 다른 pH의 전해질 및 어닐링 온도 변화에 따른 ZnSe 박막의 XRD분석이 이루어졌다.

• Bulletin of the Korean Chemical Society
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• v.20 no.2
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• pp.147-149
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• 1999

The electronic structures of α- and β-gold selenides are studied. α- and β-AuSe are known as mixed valence compounds having linear (AuSe2, Au+) and square-planar (AuSe4, Au3+) units in their structure simultaneously. Our EHTB calculations, however, show that the oxidation states of Au in α- and β-AuSe are both close to +1. This is because the frontier orbitals are largely made up of Se p-orbitals and Au d-orbitals that lie well below the Fermi level. Our results are consistent with the recent X-ray absorption spectroscopy study on AuSe which show that all Au in the compound exhibit a monovalent state independent of their chemical environments.

• Korean Journal of Plant Resources
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• v.9 no.2
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• pp.183-188
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• 1996

Chinese crude drug 'Se Sin'(細辛)has been used to cure headache, cough and expectorant. To the botanical origin of 'Se Sin', Zhong-yao-zhi(中葯志) reported Asarum heterotropoides var. mandshuricum. A. sieboldii and A. sieboldii var. seoulensis, and Zhong-yao-da-ci-dian(中葯大辭典) reported Asarum heterotropoides var. mandshuricum and A. sieboldii of Aristolochiaceae. In Korea, this crude drug has been used as a Korean folk remedy for tothache and aromatic. The botanical origin of 'Se Sin' is considered to be Asarum species of Aristolochoaceae. But there has no pharmacognostical confirmation on it. To clarify the botanical origin of 'Se Sin', we studied on the anatomical characteristics of Asarum species growing wildly in Korea i.e. A. maculatum, A. sieboldii, A. sieboldii var. seoulensis, and of 'Se Sin' from Korea on Korean market. Through our studies, the botanical origin of 'Se Sin' from Korea was proved to be whole plant of Asarum sieboldii and A. sieboldii var. seoulensis.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.3312-3317
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• 2011

Recently, the demand regarding reliability and safety of the railroad are increased as built to Driverless LRT system. Therefore, PM and SE technique is applied for efficient management of a construction business. In case of SE(System Engineering) in domestic, most foreign companies are doing to lead but we are under effort for the environment that a domestic company can lead. In this study, We emphasize to SE importance of pre-business for operation to be effective of Driveless LRT system, and propose about activities in the SE at requirements definitions and requirements analysis steps of a highest level. To achieve this, We propose SE Application Methods of Pre-Business regarding assistance process of project planning, evaluation and control, and risk management.

• Journal of the Korean Ceramic Society
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• v.44 no.2 s.297
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• pp.89-92
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• 2007

PbSe, with a band gap in the mid-infrared and a samll effective mass, is an interesting material for optical and electrical applications in infrared region. Various colloidal synthetic routes for synthesizing PbSe quantum dot nanoparticles have been developed in the last couple of years. In this work, stable colloidal solutions containing crystalline PbSe particles in the order of 5-15 nm were synthesized using different amount of acetic acid in high boiling coordinating solvents. The size and shape of PbSe nanoparticles was greatly influenced by coexistence of acetic acid in synthetic medium. It was observed by TEM that the shape of PbSe nanoparticles with different amount of acetic acid was changed from spherical to cube or star types.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.22 no.4
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• pp.83-89
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• 1986

A series of observations was conducted in order to study the accuracy of the Jlosition by automatic Loran-C navigation system with two Loran-C chains, namely 5970 and 9970 Chain, in the EJst Sea and Southern Sea of the Korean Peninsular from July to September 1986. Diurnal variation of positional error measured by 5970 Chain was almost stable throughout a whole day, and it was fairly stabl2 in the daytime but fluctuated more or less by night at each station by 9970 Chain. Daily mean values of positional error by 5970 Chain were 6'.44 SWat U1reungdo, 0'.22 SE at Jugbyeon, 0'.91 NE at Guryongpo, 0'.37 SE at Pusan, 0'.30 SE at Yokchi, 0'.37 NW at Cheju and 12'.51 SE at Taeheuksan. By 9970 Chain, they Wer2 0'.27 SWat Ulreungdo, 0'.27 SE at Jugbyeon, 0'.09 SWat Guryongpo, 0'.19 SE at Pusan, 0'. IG SE at Yokchi, 0'.17 Sr:: at Cheju and 0'.52 SE at Taeheuksan.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2008.10a
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• pp.448-452
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• 2008

Organization wishes to develop newer and more complex system according as social structure is more complex and a technology develops more. Therefore, field of system engineering in development of new system is realized by all-important essential boundary. However cost of SE have considered restrictively being not about SE cost having applied SE. About this problem, this study provides COSYSMO as model for SE cost estimation, as the application example, estimate SE cost for smart UAV system applying COSYSMO in PRICE Trueplanner.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.11a
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• pp.112-113
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• 2006

In this paper. we investigated a characteristic of holographic grating data erasure with non-polarized beam at amorphous chalcogenide As-Ge-Se-S thin film. A sample of holographic grating data was formed with DPSS laser for setup. Then, the erasure process was performed with He-Ne laser vertically at sample. As-Ge-Se-S(single layer). Ag/As-Ge-Se-S(double layer) and As-Ge-Se-S/Ag/As-Ge-Se-S(multi-layer) are manufactured to compare their characteristic of erasure.

• Proceedings of the Korean Vacuum Society Conference
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• 2014.02a
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• pp.461.2-461.2
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• 2014

양자점은 밴드갭을 조절할 수 있거나 multiple exciton generation등 과 같은여러가지 장점을 갖고 있어 양자점 감응형 태양전지에 대한 많은 연구가 진행되어왔다. 하지만 아직까지 이론적인 에너지 전환 효율에 비하여 낮은 효율을 보여주고 있다. 이러한 낮은 효율은 양자점과 전해질 계면에서의 defect나 surface state로 인한 전자-정공의 재결합으로 설명할 수 있다. 본 연구에서는 CdSe 양자점 합성법 중의 하나인 Chemical Bath Deposition의 전구체 농도조절을 통하여 고품질의 CdSe양자점을 합성하였다. 특정 농도에서 CdSe 양자점 표면에 생성되는 SeO2층을 억제하여 CdSe양자점/전해질 계면에서의 전하 재결합 저항을 높였고 가장 높은 에너지 전환 효율을 보여주었다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.21 no.47
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• pp.193-209
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• 1998

The objective of this paper is to present a methodology for design of the FMS by using a new modeling tool which is called SE&TPN(Safe Extended & Timed Petri Net). A FMS, which consists of various machine groups, may produce machine parts in different physical dimensions and lot size. The approach involves the SE&TPN modeling by Petri-nets. The proposed algorithm can handle determining of firing count vector by incidence matrix and adjustment of conflict using the marking of SE&TPN. The SE&TPN is defined as nets that can have at most one token in one place and can have elements such as permissive arcs and inhibitor arcs in addition to elements. The SE&TPN with permissive arcs and inhibitor arcs are intuitively direct approach to increase the modeling power of the SE&TPN. Finally, this paper is to develop a modulation to optimize the system problems of FMS using SE&TPN which describes exactly features of Petri Nets.