• 방송공학회논문지
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• 제24권2호
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• pp.292-298
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• 2019

본 논문에서는 클라우드 서버와 영상 품질 향상 알고리즘을 이용하여 고화질의 영상을 서비스하는 방법을 소개한다. 즉, 논문에서 제안하는 ViVa (Video Value Addition)의 개념을 바탕으로 저화질 영상을 서비스하는데 필요한 전송 비트레이트와 계산량으로 고화질의 영상을 서비스함으로써 기존 스트리밍 서비스 대비 향상된 시스템을 제안한다.

• 한국동물위생학회지
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• 제29권3호
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• pp.287-295
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• 2006

This study was conducted to evaluate effects of honeybee venom injection (VI) collected using bee venom collector compared to that of bee venom accupuncture (VA) on the body weight gain, growth rate and hematological characteristics of piglets. One hundred sixty two piglets from 15 sows were allocated in to three groups; honeybee venom subcutaneous injection groups (97 piglets from 9 sows), honeybee venom accupuncture -treated group (31 piglets from 3 sows), and non -treated control group and 30 days after birth. Honeybee venom subcutaneous injection groups divided by a syringeful; group A (0.5, 1.0, 1.5, 2.0 mg ), group B (1.0, 1.0, 1.0, 1.0 rug), and group C (1.0, 1.5, 2.0, 2.5 mg). During 60 days experiment, weight gain and survivability in VI and VA treatment of pigs were higher compared with control. Survival rate during the experiment period was 96.8% in group C, 93.2 % in VA and 86.7 % in control. Weight gain and survivability were effected by VI and VA. WBC, RBC, lymphocytes, monocytes, serum total protein, and albumin concentration were not affected by VI and VA. Serum IgG concentration of VI and VA treatments were greater than that of control. In conclusion, VI and VA were effective for improving growth performance and to increase the concentrations of blood Ig G in growing pigs. No statistical differences were found for VI and VA. These results suggested that the treatment of honeybee venom injection collected using bee venom collector could be used effectively for the increase productivity.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.64-67
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• 2002

To increase the short-circuit testing capacity of distribution transformers, testing facility has been installed for KEPCO in Vi-wang. The power supply of testing facility is directly supplied from the network substation located closely. Testing can be performed up to 300 kVA for single-phase transformers, 500 kVA for three-phase transformers. Operating with this facility, the distribution company is able to maintain the reliable supply of electricity. Also the critical quality of transformers from manufacturers can be verified by short-circuit testing. This paper describes the design concept and specification of newly developed equipment and the procedure of short-circuit test.

• Bulletin of the Korean Chemical Society
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• 제31권10호
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• pp.2813-2818
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• 2010

A novel method was developed for the speciation of chromium in natural water samples based on homogeneous liquid-liquid extraction and determination by flame atomic absorption spectrometry (FAAS). In this method, Cr(III) reacts with a new Schiff's base ligand to form the hydrophobic complex, which is subsequently entrapped in the sediment phase, whereas Cr(VI) remained in aqueous phase. The Cr(VI) assay is based on its reduction to Cr(III) by the addition of sodium sulfite to the sample solution. Thus, separation of Cr(III) and Cr(VI) could be realized. Homogeneous liquid-liquid extraction based on the pH-independent phase-separation process was investigated using a ternary solvent system (water-tetrabutylammonium ion ($TBA^+$)-chloroform) for the preconcentration of chromium. The phase separation phenomenon occurred by an ion-pair formation of TBA and perchlorate ion. Then sedimented phase was separated using a $100\;{\mu}L$ micro-syringe and diluted to 1.0 mL with ethanol. The sample was introduced into the flame by conventional aspiration. After the optimization of complexation and extraction conditions such as pH = 9.5, [ligand] = $1.0{\times}10^{-4}\;M$, [$TBA^+$] = $2.0{\times}10^{-2}\;M$, [$CHCl_3$] = $100.0\;{\mu}L$ and [$ClO_4$] = $2.0{\times}10{-2}\;M$, a preconcentration factor (Va/Vs) of 100 was obtained for only 10 mL of the sample. The relative standard deviation was 2.8% (n = 10). The limit of detection was sufficiently low and lie at ppb level. The proposed method was applied for the extraction and determination of chromium in natural water samples with satisfactory results.

• Nuclear Engineering and Technology
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• 제33권5호
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• pp.468-482
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• 2001

As a process of Direct Containment Heating (DCH) issue resolution for Korean Standard Nuclear Power Plants (KSNPs), a containment load/strength assessment with two different approaches, the probabilistic and the deterministic, was performed with all plant-specific and phenomena-specific data. In case of the probabilistic approach, the framework developed to support the Zion DCH study, Two-Cell Equilibrium (TCE) coupled with Latin Hypercubic Sampling (LHS), provided a very efficient tool to resolve DCH issue. In case of the deterministic approach, the evaluation methodology using the sophisticated mechanistic computer code, CONTAIN 2.0 was developed, based on findings from DCH-related experiments or analyses. For three bounding scenarios designated as Scenarios V, Va, and VI, the calculation results of TCE/LHS and CONTAIN 2.0 with the conservatism or typical estimation for uncertain parameters, showed that the containment failure resulted from DCH loads was not likely to occur. To verify that these two approaches might be conservative , the containment loads resulting from typical high-pressure accident scenarios (SBO and SBLOCA) for KSNPs were also predicted. The CONTAIN 2.0 calculations with boundary and initial conditions from the MAAP4 predictions, including the sensitivity calculations for DCH phenomenological parameters, have confirmed that the predicted containment pressure and temperature were much below those from these two approaches, and, therefore, DCH issue for KSNPS might be not a problem.

• 대한치과교정학회지
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• 제28권5호
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• pp.825-838
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• 1998

본 연구는 네 개의 소구치 발치 후 교정치료시 아직 성장중인 청소년과 왕성한 성장 시기를 지난 성인간의 연조직 변화의 차이를 관찰하고자 한다. 서울중앙병원 교정과에 내원한 환자중 남자 18세 및 여자 16세를 기준으로 성인군과 청소년군으로 연구대상을 나눈 후 두군간 연조직 변화를 조사하였다. 교정치료에 의한 치아 및 경조직의 변화를 포함하여 연조직 변화에 영향을 줄 것으로 예상한 구순후경, 앵글씨 구치관계 및 치열궁길이 부조화 등을 변수로 하여, 변수와 연조직 변화와의 상관관계를 조사하여 다음과 같은 결과를 얻었다. 1. 경조직 계측항목중 성인의 Is, Ii, UIPP, L1MP의 감소와 청소년의 Is, Ii 감소 및 A, Pog'의 증가가 유의성이 있었고, 수직변화는 성인의 Pog의 증가, Ii의 감소와 청소년의 모든 항목의 증가가 유의성이 있었다. 2. 연조직 계측항목중 성인의 Ls, Li, ILS의 후방이동과 청소년의 Sn, SLS, Ls, Pog'의 전방이동이 유의성을 보이고, 수직 변화는 성인에서 볼 수 없는 반면 청소년에서는 모든 항목에서 유의성 을 보이며, 청 소년의 이순각의 감소, 성인과 청소년의 ${\Delta}LsE,\;{\Denta}LiE$ 및 청소년의 ${\Delta}LiSP$ 등에서 유의차를 보였다. 3. 수직, 수평 기준선에 대한 경,연조직 변화간 상관관계는 성인에서 ${\Delta}VIs와\;{\Delta}VLs$가 가장 컸고, 그 다음으로 ${\Delta}Ii/{\Delta}Li,\;{\Delta}Ii/{\Delta}ILS,\;{\Delta}ID/{\Delta}Li와\;{\Delta}ID/{\Delta}ILS$ 등이 높았으며 청소년에서는 수직, 수평 변화의 모든 항목간 유의성이 높았다. 4. 연조직 Profile변화는, 상하전치절단연의 후방견인 및 치축변화가 두군간 연조직변화와의 상관성에 차이를 보이나, 하순의 이동은 공통적으로 경조직 변화에 덜 영향받으며, 두군에서 비순각 및 이순각은 유의성있는 상관관계를 보이지 않았다. 5. 상순후경이 얇을수록 두군 모두 Sn-Pog'에 대하여 상순이 더 많이 후퇴하였고, 하순후경이 얇을수록 청소년군에서만 E-line 및 Sn-Pog'에 대하여 하순이 더 많이 후퇴하였다. 6. 치료전 앵글씨 구치관계는 연조직변화에 영향을 주지 못하였다. 7. 치료전 치열궁길이 부조화는 연조직변화에 영향을 주지 못하였다.