• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07a
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• pp.278-281
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• 2003

The p-CIn2Te4 single crystal was grown in the three-stage vertical electric furnace by using Bridgman method. The quality of the grown crystal has been investigated by the x-ray diffraction and the photoluminescence measurements. From the photoluminescence spectra of the as-grown CdIn2Te4 crystal and the various heat-treated crystals, the (Do, X) emission was found to be the dominant intensity in the photoluminescence spectrum of the CdIn2Te4:Cd, while the (Ao, X) emission completely disappeared in the CdIn2Te4:Cd. However, the (Ao, X) emission in the photoluminescence spectrum of the CdIn2Te4:Te was the dominant intensity like an as-grown CdIn2Te4 crystal. These results indicated that the (Do, X) is associated with VTe acted as donor and that the (Ao, X) emission is related to VCd acted as acceptor, respectively. The p-CdIn2Te4 crystal was found to be obviously converted into the n-type after annealing in the Cd atmosphere. The origin of (Do, Ao) emission and its TO phonon replicas is related to the interaction between donors such as VTe or Cdint, and accepters such as VCd or Teint. Also, the In in the CdIn2Te4 was confirmed not to form the native defects because it existed in the stable form of bonds.

• Journal of Acupuncture Research
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• v.31 no.3
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• pp.67-73
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• 2014

Objectives : Amyotrophic lateral sclerosis(ALS) is a progressive neurodegenerative disorder characterized by a selective death of motor neuron, leading to respiratory insufficiency. The purpose of this study was to assess the long term respiratory management of ALS patient with respiratory failure. Methods : One ALS patient applying a non-invasive BIPAP ventilator as well as Korean medical treatment such as acupuncture, pharmacopuncture and herbal medicine was measured on $SpO_2$, $EtCO_2$, Vte(expiratorytidalvolume) for 2 years 7 months. Results : The $SpO_2$, $EtCO_2$ of ALS patient were maintained in the normal range for 2 years 7 months. The Vte of ALS patient also wasn't worse in this study. Conclusions : In this study, the long term respiration management, combined administration of Korean medical treatment and non-invasive BIPAP ventilator, could be effective in ALS patient with respiratory failure.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.440-442
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• 2008

한국전력공사는 강진변전소에 FACTS 설비인 80MVA UPFC를 (주)효성과 공동으로 개발하여 2003. 5월 준공하였다. 강진 UPFC는 40MVA 병렬인버터와 40MVA 직렬인버터로 구성되어 있으며, 대용량 인버터 핵심기술은 지멘스와의 기술제휴로 개발되었다. 한국전력공사는 UPFC 운영을 통하여 확보된 기술을 기반으로 제어기술을 국산화하고 있으며, 현재 유지보수용으로 GTO 밸브 시험 장비를 개발하였다. 본 설비는 기존 수작업에 의한 GTO 밸브의 건전성 시험을 자동화하고, 자료를 체계적으로 이력 관리함으로써, UPFC 설비의 신뢰성 향상에 도움을 줄 것으로 기대된다.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1676-1681
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• 2006

We report on Organic Vapor Phase Deposition $(OVPD^{(R)})$ an innovative deposition technology for organic light emitting device (OLED) and organic semiconductor manufacturing. The combination of $OVPD^{(R)}$ with Close Coupled Showerhead (CCS) technology results in manufacturing equipment with vast potential for cost effective manufacturing of OLED displays commercially competitive to LCD. The actual $OVPD^{(R)}$ equipment concept and design is discussed: Computational Fluid Dynamic (CFD) modeling is compared with experimental results proving the excellent controllability of the deposition process. Further other production relevant deposition properties are being reviewed e.g. high deposition rates and high organic material utilization efficiency of the $OVPD^{(R)}$ - Technology. Data from devices made by $OVPD^{(R)}$ show comparable/ superior performance to those fabricated with conventional vacuum thermal evaporation (VTE) techniques. An outlook on further potentials of $OVPD^{(R)}$ with respect to enabling advanced organic device structures is given.

• 한국정보디스플레이학회:학술대회논문집
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• 2007.08a
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• pp.336-339
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• 2007

The enhanced control of OLED deposition processes by Organic Vapor Phase Deposition $(OVPD^{(R)})$ is discussed. $OVPD^{(R)}$ opens a wide space of process control parameters. It allows the accurate and individual control of deposition layer properties like morphology and precise mixing of multi component layers (co-deposition) in comparison to conventional deposition manufacturing processes like e. g. VTE (vacuum thermal evaporation).

• Bulletin of the Korean Chemical Society
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• v.28 no.1
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• pp.85-88
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• 2007

Ab initio periodic Hartree-Fock calculations with the full potential and minimum basis set are applied to interpretation of scanning tunneling microscope (STM) and atomic force microscope (AFM) images on 1TVTe2. Our results show that the simulated STM image shows asymmetry while the simulated AFM image shows the circular electron densities at the bright spots without asymmetry of electron density to agree with the experimental AFM image. The bright spots of both the STM and AFM images of VTe2 are associated with the surface Te atoms, while the patterns of bright spots of STM and AFM images are different.

• Clean Technology
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• v.14 no.2
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• pp.71-86
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• 2008

In this review we discussed the effective ways to catalytically derive value-added chemicals from propane which has been utilized only as an energy source so far. Among various propane-derived products, the most valuable chemicals such as propylene and acrylonitrile were mainly focused herein. Propylene could be manufactured through oxidative dehydrogenation of propane using $O_2,\;CO_2$, etc. as an oxidant for the purpose of overcoming thermodynamic limitations of propane dehydrogenation. On the other hand, propane ammoxidation would be an alternative to propylene ammoxidation for producing acrylonitrile since propane is much cheaper than propylene as a starting material. Although effective $MoVTeNbO_x$ catalysts have been developed fur propane ammoxidation in recent years, more detailed studies should be thoroughly performed. In carrying out both oxidative dehydrogenation and ammoxidation of propane fur a long period, the most critical issue is definitely considered to find out the most active and selective catalysts, which makes it possible to commercialize both reactions into economically viable processes.

• Tuberculosis and Respiratory Diseases
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• v.81 no.1
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• pp.49-58
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• 2018

Background: Information regarding the incidence and risk factors for deep vein thrombosis (DVT) detected by follow-up computed tomographic (CT) venography after pulmonary embolism (PE) is sparse. The aim of the present study was to identify the predictors of DVT in follow-up CT images, and to elucidate their clinical significance. Methods: Patients with PE were classified into the following three cohorts based on the time of indirect CT venography follow-up: within 1 month, 1 to 3 months, and 3 to 9 months after the initial CT scan. Each cohort was subdivided into patients with or without DVT detected by follow-up CT. Clinical variables were compared between the two groups. Results: Follow-up CT revealed DVT in 61% of patients with PE within 1 month, in 15% of patients with PE at 1 to 3 months, and in 9% of patients with PE at 3 to 9 months after the initial CT scan. Right ventricular (RV) dilation on the initial CT (odds ratio [OR], 8.30; 95% confidence interval [CI], 1.89-36.40; p=0.005) and proximal DVT at the initial presentation (OR, 6.93; 95% CI, 1.90-25.20; p=0.003) were found to independently predict DVT in follow-up CT images within 1 month, proximal DVT at the initial presentation was found to independently predict DVT in follow-up CT images at 1 to 3 months (OR, 6.69; 95% CI, 1.53-29.23; p=0.012), and central PE was found to independently predict DVT in follow-up CT images at 3 to 9 months (OR, 4.25; 95% CI, 1.22-4.83; p=0.023) after the initial CT scan. Furthermore, the detection of DVT by follow-up CT independently predicted the recurrence of venous thromboembolism (VTE) (OR, 4.67; 95% CI, 2.24-9.74; p<0.001). Conclusion: Three months after PE, DVT was not detected by follow-up CT in most patients with PE. RV dilation on the initial CT, central PE, and proximal DVT at the initial presentation were found to predict DVT on follow-up CT, which might predict VTE recurrence.

• The Transactions of the Korean Institute of Power Electronics
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• v.13 no.5
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• pp.391-395
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• 2008

KEPCO 80MVA UPFC has been operated in Gangjin Substation since May 2003. This UPFC is composed of 40MVA shunt inverter and 40MVA series inverter, and developed in technical cooperation between Hyosung and Siemens. KEPCO has tried to localize UPFC control technique after its installation and developed GTO Thyristor Valve Test Equipment for annual maintenance test. The development of this equipment make it possible to process GTO Thyristor module test automatically and manage historic data systematically, which could improve UPFC reliability.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.9 no.1
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• pp.20-22
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• 1999

The effect of dopant and stoichiometry on the physical and optical properties of $LiNbO_{3}$ were studied. We prepared three samples, undoped, MgO doped $LiNbO_{3}$ with congruent composition and near-stoichiometric $LiNbO_{3}$. Dielectric constant and transmittance in UV/VIS/IR light range were measured. The results showed that the features for high [Li]/[Nb] were similar to those for low [Li]/[Nb] but with high [Mg].