• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 제39회 하계학술대회
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• pp.1315-1317
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• 2008

The plasma display panel is an image expression display using gas discharge. However gas discharge characteristics vary with temperature. Furthermore, the potential difference among three electrodes appears in sustain period due to external applied voltages. It affects to the wall charge state accumulated on the electrodes. This research aims at identifying that the discharge characteristics depend on the potential difference and temperature. The results show that the wall charge loss increases with increase of the number of applied pulse during sustain period and it severely appears at high temperature.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2003년도 하계학술대회 논문집 Vol.4 No.1
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• pp.444-447
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• 2003

All objects with some temperature above absolute zero radiate in the infrared. The intensity of the infrared radiated from a object defends on the condition and temperature on the surface of the one. The present, these techniques are frequently adopted into diagnosis for electricity equipments. Simply, however, the applied techniques are passive thermal testing for the detection of loosened terminals and overcurrent. In this paper, a infrared thermal imager was applied to high voltage windings of cast resin transformers, and the accumulated value of the result temperatures was used for evaluating remained lifetime of them. At each aging level, dielectric loss tangent test was carried out. The results offered capabilities for deciding the condition of the transformers suffering difficulties to diagnose.

• Journal of Welding and Joining
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• 제3권2호
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• pp.35-41
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• 1985

The fracture toughness of subcritical HAZ in the hot strained weldments of two structural steels(SB 41 and SA 537) has been investigated by COD test method and metallurgical study. The obtained results are summarized as follows; 1. The hot straining embitterment of subcritical HAZ depends on the hot straining amounts of notch tip, and the transition temperature( $T_{tr}$ ) increases with the accumulated hot straining amounts(.SIGMA. vertical bar .delta.$_{t}$vertical bar). 2. The fracture toughness of subcritical HAZ depends on materials and microstructure. The transition temperature( $T_{tr}$ ) of subcritical HAZ in SB 41 is almost same as that of parent material, however in SA 537 the temperature is higher than that of parent and lower than that of transformed HAZ. 3. The subcritical HAZ in SA 537 shows a higher toughness at small amounts of hot straining (.SIGMA. vertical bar .delta. $_{t}$vertical bar<0.3mm).mm).

• 한국자동차공학회논문집
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• 제14권1호
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• pp.183-190
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• 2006

For continuously regenerative PM collecting system which adopted thermally stable SiC DPF and electrical heater which was placed upstream of the filter and driven by well constructed control logic, PM oxidation characteristics were investigated varying air flow rate, amounts of PM accumulated on the DPF and filter inlet temperature in order to get optimized PM regeneration performance. This study showed that the operating condition of air flow rate 70 lpm, high PM loading around 30g and filter inlet temperature $700^{\circ}C$ with heat insulation was effective in achieving high regeneration efficiency. Also, in this condition, we could decrease the electric energy consumption by reducing the regeneration time.

• 한국전기전자재료학회논문지
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• 제15권2호
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• pp.127-132
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• 2002

Space charge distributions and behaviors in silane crosslinked polyethylene(SXLPE)/ crosslinked polyethylene(XLPE) laminates were investigated using a pulsed electroacoustic (PEA) method. In case of monolayer, XLPE shows heterocharge while SXLPE shows homocharge. It was observed that charges were accumulated at the interface of SXLPE/XLPE laminate when applied electric field was more than 20kV/mm. The charge profile at various temperatures was also acquired using temperature-controllable PEA system. Although applied electric field is only 8.6 kV.mm, positive interfacial charge starts to appear near 50$^{\circ}C$. It was found that the interfacial charge behavior of SXLPE/XLPE laminate under low voltage at high temperature is corresponding to that under high voltage at room temperature.

• 한국지구과학회지
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• 제28권5호
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• pp.598-602
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• 2007

A long-term in situ observation was carried out in the Ice-valley at Milyang in order to explain the factors and processes associated with the summertime ice formation. The variation of temperature inside Ice-valley in relation with ice formation in summer time was found to depend on precipitation rate in spring and cold air sinking in autumn and winter. The rate of temperature rising tends to correspond to sensible heat release depending on the precipitation amount at the freezing location. The reason of the cold air accumulation in a talus in the Ice-valley is the cold air sinking over the surface of talus due to the occurrence of outside clod air mass and the accumulated cold air from autumn to spring flow outside at the bottom of talus. The out-flowing cold air can result in the ice formation in the hot summer.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2187-2189
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• 2001

The proposed algorithm has produced the rules of relationship between the load voltage, current, discharging electric power and ampere-hours, electric power capacity of battery on the basis of the data. Which were acquired through the battery discharging experiment that is defined by the battery's ambient temperature and various load conditions. Especially, by calculating the parameter of second order polynomial equation relation between the remaining capacity and the electric power, the algorithm is proposed adapting for the discharging pattern. And as the depth of discharging is increasing, the calculation-method of electric power is applied to decrease the accumulated error in the calculation method of capacity accumulation. Also, the proposed algorithm has compensated the temperature considering the capacity change of battery to the temperature.

• Journal of Ceramic Processing Research
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• 제13권spc2호
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• pp.163-165
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• 2012

Impedance spectroscopy informs electrical properties of materials as accumulated charges, contact status between electrode and organic materials. We carried out impedance spectroscopy of organic light-emitting diodes as ITO/Alq3(60 nm)/Al on temperatures from 10 K to 300 K. The result described Z'-Z" plot, cole-cole plot and dielectric relaxation time τ. Z'-Z" plot means that real and imaginary part of materials in organic and electrode by frequencies and temperature. Z' as real part of impedance by applied frequency depending on temperature shows the plateau in low frequency region as Rs+ Rp and over 100 kHz in high frequency region as Rs. Cole-cole plot shows resistance of materials in equivalent circuit of the device by temperatures. And equivalent circuit and dielectric relaxation could be accomplished by using the complex impedance analysis.

• 한국환경농학회지
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• 제16권2호
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• pp.124-129
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• 1997

중금속오염폐수처리에 미생물 이용 가능성을 검토하기 위하여 중금속에 강한 내성을 지님과 동시에 균체내 중금속 축적능력이 우수한 중금속 내성균을 분리하여 온도, pH, 및 균체 전배양시간 등과 같은 외부 요인에 따른 균체내 중금속 축적변화를 조사한 결과는 다음과 같다. 중금속화하물 종류에 따른 균체내 중금속 축적량은 $-nitrate(NO_3)$ group을 가진 중금속화합물에서 약간 높았으나 화합물 종류에 따라서 큰 차이는 없었다. 균체 전배양시간에 따른 중금속 축적은 24시간 전배양한 균체에서 높게 나타났으나 전반적으로 전배양시간에 따라서 큰 차이는 없었다. 중금속 내성균의 균체내 중금속 축적은 온도, pH등 외부환경요인에 영향을 받았으며, 중금속 내성균의 중금속 최적축적 온도는 전반적으로 $20{\sim}37^{\circ}C$ 범위였고, 중금속 최적축적 pH는 전반적으로 $6{\sim}8$ 범위였다. 중금속을 처리한 용액중 중금속 내성균의 균체량을 증가시킬수록 균체내 축적된 총 중금속양은 증가되었으나 균체 단위 g당 중금속 축적량은 감소되었으며, 균체량의 증가에 비례해서 중금속 축적량이 증가되지는 않았다.

• 생물환경조절학회지
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• 제13권2호
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• pp.73-80
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• 2004

한국 고추 주산단지에 '금탑', '부강' 품종을 1998년과 1999년에 재배하여 4회에 걸쳐 홍고추를 수확하였다. 고추의 과장, 과중, 건물율을 조사하고 색도를 분석한 후 고추 생육기간 동안의 지역별 온도 강우량 일조시간의 기상여건과 상관을 살펴보았다. 고추는 초기수확보다 후기로 갈수록 과장이 짧아지고, 과중은 가벼워지는 경향을 보였다. 두 품종간의 특성은 뚜렷한 차이를 보였으나 연도별 차이는 크지 않았다. 건물율은 수확시기가 늦어질수록 높아졌으며, 고추의 붉은색 비교를 위한 a${\times}$L값은 조사에서는 수확시기가 늦어질수록 높아지는 경향이 나타났다. 기상여건과 고추 과실 생장과의 상관관계를 살펴보면, 과장은 수확 전의 적산온도와 양의 상관이 있었다. 과중은 강우량과 수확직전의 적산온도와 상관이 있는 것으로 나타났다. 건물율은 수확 전 온도와 음의 상관을, 일조량과 양의 상관을 보였다. 붉은색 정도는 생육기간의 강우량과 음의, 일조와는 양의 높은 상관이 있었으며, 결정계수($r^3$)도 모든 외적품질 중 가장 높게 나타났다.