• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.337-338
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• 2015

본 논문은 BESS 기반 전력피크 대응 peak shaving 알고리즘에 대하여 설명한다. 전력망 응용에 적용되는 BESS는 다양한 C-rate (charge rate)을 갖으며, 이를 고려한 알고리즘 개발이 요구된다. 상대적으로 높은 C-rate을 갖는 BESS의 경우 단주기 응용으로 적용될 수 있으나, 보다 효과적인 활용방안은 두 가지의 이상의 목적을 위한 운용이 요구된다. 더욱이 전력피크 예측을 위한 정교한 부하예측 방법이 필요하다. 본 논문에서는 단주기 및 장주기 응용을 모두 고려하였을 때 요구되는 peak shaving 알고리즘 설계 및 Algebraic Prediction을 이용한 부하예측에 대하여 논하고자 한다.

• 한국연소학회지
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• 제5권1호
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• pp.7-18
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• 2000

Numerical simulations of counterflow non-premixed $CH_4/C_2HCl_3/Air$ flames added 8%(by volume) C2HCl3 on the fuel side are conducted at atmospheric pressure using a detailed chemical reaction mechanism in order to understand the effect of strain rates. A detailed sensitivity analysis is also performed in order to assess the relative influence of each reaction on the flame established at a strain rate of 200s-1. The structure of flames (i.e., temperature, velocity, and concentration of species) established at both a strain rate of 150s-1 and 300s-1 are investigated. As the strain rate increases, the "flame zone" is restricted to a narrower range and the position of maximum temperature is shifted to the fuel side. The concentrations of major species, H2O, CO, H2, HCl, Cl2, and Cl are decreased with increased strain rate. The reaction involving chlorine, CH4 + Cl $\rightarrow$ CH3 + HCl, instead of the reaction, CH4 + H $\rightarrow$ CH3 + H2 influences the consumption of methane. C2HCl3 + OH $\rightarrow$ CHCl2 + CHOCl and HCl + OH $\rightarrow$ H2O + Cl, are major reactions, through which OH radicals are consumed.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2000년도 영호남학술대회 논문집
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• pp.21-24
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• 2000

Properties of thermoelectric power in PbS thin films by chemical bath deposition were investigated The qualified PbS thin film was gained with the amounts of Thiourea($4-8ml/{\ell}$ ), Triethanolamine (1-2ml) and NaOH(l0ml). The molecular ratio of Pb and S was 3 : 7. Satisfied crystallization rate and deposition rate of PbS were greater at $50^{\circ}C$ than at $30^{\circ}C$. The constant of thermoelectric power in PbS was nearly $ 500uv/^{\circ}k$. The PbS thin film was changed from p-type to n-type semiconductor at around $200^{\circ}C$. In case of heat treatment at $300^{\circ}C$, the sample kept the characteristic of p-type semiconductors up to $250^{\circ}C$.

• Journal of Preventive Medicine and Public Health
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• 제16권1호
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• pp.89-97
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• 1983

From January to March in 1979 and 1982, the vaccination rate of B.C.G., D.P.T and Sabin with 392 infants who were registered at M.C.H. room in a Health Center in Seoul were as follows: 1 There were no specific relations between the sex and the vaccination for B.C.G., D.P.T. and Polio. 2. In 1982, the younger the mother's age was, the higher the vaccination rate for B.C.G. was. For the D.P.T. and Polio the rate of above 35 year group was the highest but the completion rate of the vaccination and the regular vaccination rate were the highest in the age of 30-34 year group. 3. In 1982. the higher the educational levels of tile mother were, the higher the vaccination rates for B.C.G., D.P.T. and Polio were. 4. The vaccination rate for B.C.G. within a month after birth was the highest in Salaried laborer group. The completion rate of the vaccination and regular vaccination rate for D.P.T. add Polio were also the highest in salaried laborer group. 5. In 1982, the rates of all vaccination for B.C.G. were tile highest in the first child. The completion rate of the vaccination and regular vaccination rate for D.P.T and Polio were also the highest in the first child in 1982.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2005년도 춘계학술발표대회 개요집
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• pp.229-231
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• 2005

Friction surfacing of STS304 consumable rod on S45C substrate was investigated by microstructural observation and mechanical tests. STS304 layer formed a strongly-bonded thick layer under a wide range of surfacing conditions. The hardness distribution showed the peak value in the boundry layer, while the highest coating efficiency obtained in the condition of 1000rpm-2.5mm/sec-2.5mm/sec. As the consumable rotation rate and the traveling rate increased, the coating efficiency tended to decrease. On the other hand, as the feeding rate increased, the coating efficiency appeared to be increased.

• Clinical and Experimental Pediatrics
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• 제48권6호
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• pp.614-618
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• 2005

목 적 : Cystatin C는 최근 사구체 여과율의 정확한 지표로 제시되고 있다. 본 연구에서는 소아 및 청소년에서 연령에 따른 혈청 cystatin C 농도의 변화, 혈청 cystatin C 농도의 정상 범위, 혈청 cystatin C 농도와 사구체 여과율의 연관성을 분석하여 소아 및 청소년에서 사구체 여과율의 지표로서 혈청 cystatin C 농도의 유용성을 알아보고자 하였다. 방 법 : 2004년 5월부터 7월까지 중앙대학교 용산병원을 방문하여 혈액 검사를 시행받은 환아들 중에서 신질환의 증거가 없는 276명의 환아들을 대상으로 혈청 cystatin C와 creatinine을 측정하였고, 사구체 여과율은 Schwartz's formula로 추정하였다. 결 과 : 1) 혈청 cystatin C 농도는 1세 이상보다 1세 미만에서 유의하게 높았다. 2) 혈청 cystatin C 농도는 1세 미만에서 연령과 음의 상관관계를 보였으나, 1세 이상에서는 유의한 상관관계를 보이지 않았다. 3) 1세 이상에서 혈청 cystatin C 농도의 정상 범위는 0.46-1.05 mg/L였다. 4) 1/cystatin C은 Schwartz's formula로 추정된 사구체 여과율과 양의 상관관계를 보였다. 결 론 : Cystatin C는 소아 및 청소년에서 사구체 여과율의 지표로 유용하게 사용될 수 있을 것으로 생각된다.

• 대한기계학회논문집A
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• 제26권3호
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• pp.521-527
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• 2002

In this paper, tensile behavior and low cycle fatigue behavior of 316L stainless steel which is currently favored structural material for several high temperature components such as the liquid metal cooled fast breeder reactor (LMFBR) were investigated. Research was performed at 55$0^{\circ}C$, $600^{\circ}C$ and $650^{\circ}C$ since working temperature of 316L stainless steel in a real field is from 40$0^{\circ}C$ to $650^{\circ}C$. From tensile tests performed by strain controls with $1{\times}10^{-3}/s,\; l{\times}10^{ -4}/s \;and\; 1{\times}10/^{ -5}/ s $ strain rates at each temperature, negative strain rate response (that is, strain hardening decreases as strain rate increases) and negative temperature response were observed. Strain rate effect was relatively small compared with temperature effect. LCF tests with a constant total strain amplitude were performed by strain control with a high temperature extensometer at R.T, 55$0^{\circ}C$, $600^{\circ}C$, $650^{\circ}C$ and total strain amplitudes of 0.3%~0.8% were used and test strain rates were $1{times}10^{-2} /s,\; 1{times}10^{-3} /s\; and\; 1{times}10^{-4} /s$. A new energy based LCF life prediction model which can explain the effects of temperature, strain amplitude and strain rate on fatigue life was proposed and its excellency was verified by comparing with currently used models.

• 한국식품과학회지
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• 제19권5호
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• pp.451-452
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• 1987

취반온도가 밥의 저장($4^{\circ}C$, 72시간)중 노화속도에 미치는 영향을 조사하였다. 취반온도($100{\sim}120^{\circ}C$)가 올라갈수록 밥의 노화속도는 감소하였다. 노화시간 상수(속도상수의 역수)는 $110^{\circ}C$ 및 $120^{\circ}C$에서 취반한 밥이 $100^{\circ}C$의 밥보다 각각 1.2 및 1.5배 큰 값을 보였다. 취반온도가 올라갈수록 밥의 저장중 노화될 수 있는 물질의 양 및 노화된 물질의 양은 모두 감소하였다.

• 열처리공학회지
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• 제25권1호
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• pp.14-21
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• 2012

The effects of cutting condition and tempering temperature for the shape of cutting chip were investigated. For this purpose, a lead-free brass containing 1wt.% of Bi extruded at $750^{\circ}C$ in straight turning was used in this study. The cutting chip preferred was mainly found to be loose form of arc chips with curling discontinuity, and these were formed by shear fracture. However, some of fragmental element chip were found to be mixed when tempering temperature was as high as $500^{\circ}C$. The form and size of chip was more affected by feed rate than by tempering temperature and cutting rate. In addition, the cutting surface was observed to be formed more rough in the case of high feed rate and low cutting rate compared to low feed rate and high cutting rate.

• 한국약용작물학회지
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• 제24권5호
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• pp.393-400
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• 2016

Background: This study was conducted to investigate the effects of germination temperature, storage container and storage temperature on Scrophularia buergeriana and Scrophularia takesimensis seeds. Methods and Results: Seed lengths of both species were 0.8 mm, while seed width differed, with S. buergeriana measuring 0.5 mm and S. takesimensis measuring 0.4 mm. The seeds of S. buergeriana were packaged in paper containers under room temperature ($15^{\circ}C$), cold temperature ($4^{\circ}C$), and freeze temperature ($-20^{\circ}C$). These seeds exhibited around 80% germination rate at temperatures between $15^{\circ}C$ and $30^{\circ}C$. The germiantion rate of S. takesimensis, on the other hand, differed significantly at different germination temperatures. Seeds of S. takesimensis which were packaged in vinyl and paper containers and stored under room and cold temperatures, exhibited around 80% germination rate at $15^{\circ}C$. However, the germination rate of freeze-stored seeds were decreased to lower than 20% at germination temperatures of $15^{\circ}C$, $25^{\circ}C$ and $30^{\circ}C$ germiantion conditions. The rate of germination showed a low positive to a significantly negativie correlation with the other factor that were determined to evaluate the germination performance. Conclusions: This study elucidates the most suitable germination and storage conditions to increase the germination rate for the two species of Scrophularia buergeriana and Scrophularia takesimensis needs to be stored in paper containers under cold temperature and requires a temperature of $20^{\circ}C$ for germination. On the other hand, S. takesimensis in vinyl containers need to be stored at room temperature and those in paper containers at cold temperature, and a temperature of $15^{\circ}C$ is required for germination.