폴리플로 필렌박막의 부성저항 특성

홍진웅,강도열,김재환,이중웅 대한전기학회 1984 대한전기학회 학술대회 논문집 Vol.1984 No.7

열처리된 저밀도폴리에틸렌의 절연파괴특성에 관한 연구

홍진웅 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.4

고체구조와 절연파괴의 관계를 확실하게 알아보기 위하여 온도 100[.deg.C]의 실리콘유 내에서 1시간 열처리한 시료에 대해서 직류(DC)와 임펄스 절연파괴특성을 검토했다. 시료의 결정화도는 적외선 흡수와 X선 회절실험 측정방법으로 평가했으며 그리고 시료의 결정립크기와 분상은 시차주사 열량측정을 이용하였다. 실험결과 결정화도의 크기는 서냉, 수냉, 원시료 그리고 급냉시료 순으로 적어짐을 확인하였고 각각 70.23[%], 61.6[%], 56.75[%] 및 34.7[%]를 얻었다. 온도 30, 50[.deg.C]에서 임펄스 절연파괴특성은 결정화도의 감소에 따라 높아지는데 이것은 전자열적파괴를 시사하고 있다. 그리고 온도의 증가에 따라 임펄스 절연파괴강도는 감소되는데 이것은 Frohlich-type의 파괴이론을 제시한다. 또한 직류절연파괴는 저온영역에서 결정화도에 거의 의존하지 않지만 그러나 고온영역에서는 약간 의존한다.

Dependence of the efficiency improvement of organic light-emitting diodes on the thickness of the Cs2CO3 electron-injection layer

홍진웅,김창훈,한현석,강용길,이종용,김태완 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.10

An efficiency improvement of organic light-emitting diodes (OLEDs) was studied by varying the thickness of the electron-injection layer (EIL). First, an optimum EIL thickness of Cs2CO3 was confirmed by using a simulation program. Then, the OLEDs were designed to have a structure of indium-tin-oxide (ITO)/N,N′-diphenyl-N,N′-bis(3-methylphenyl)-1,1′-biphenyl-4,4′-diamine (TPD)/tris(8-hydroxyquinolinate) aluminum (Alq3)/cesium carbonate (Cs2CO3)/aluminum (Al). By using the thermal evaporation method, we manufactured specimens to the optimum thickness of the material found in the simulation, and we investigated how the Cs2CO3 EIL affected the efficiency of the OLEDs. As a result, because the Cs2CO3 EIL reduced the potential barrier in the cathode by 0.08 eV, it facilitated the movement of electrons, which confirmed that the Cs2CO3 improved the efficiency of the OLEDs as it increased recombination by blocking hole movement. When compared to the device without the EIL, the device with a 1.0 nm-thick Cs2CO3 EIL showed an excellent efficiency. The luminance and the external quantum efficiency increased about 600% and 500%, respectively.

반사선을 이용한 곡면질의 개선

홍진웅,이건우 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Reflection line method is a very useful surface interrogation tool because it simulates the real reflection lines on a computer screen. It is also possible to correct the minor deviations of a surface by correcting the reflection lines on the surface.<br/> This work presents a new definition of a reflection line that will look very similar to the real reflection line on a surface and represent the properties of the surface well. By virtue of this new definition. it is possible to modify the interior portion of B-spline surface by adjusting the specific control points of the surface automatically according to the desired modification on the reflection lines. In addition. G' continuity between two adjacent B-spline surfaces is also improved by using the reflection lines.<br/>

열자격 전류 방법에 의한 폴리테트라후로루에치렌 박막의 전기적 특성에 관한 연구 ( A Study on the Electrical Properties of Polytetrafluoroethylene Film Based on Thermally Stimulated Current Method )

홍진웅,이준웅 대한전자공학회 1987 대한전자공학회 학술대회 Vol.1987 No.7

폴리테트라후로루에틸렌박막의 유전특성에 관한 연구

홍진웅 光云大學校 1990 論文集 Vol.19 No.-

In order to investigate the behaviors of carrier in ploytetrafluoroethylene such as dielectric relaxation were observed on the specimen with 100[㎛] thickness. The dielectric properties were carried out in the temperature range of 30-150[℃] and frequency range of 30-3×10?[Hz] respectively Dielectric loss characteristics observed with very low frequency about the temperature of 120[℃] was related to the micro-brownian motion occurred at glass transition temperature, the activation energy of which was estimated as 15.18[㎉/mole] by Eyring theory. The dielectric loss tangent estimated from the characteristics of thermally stimulated current, which possessed strong resemblance to dielectric relaxation was the value 4.5×10? at 10?[Hz] which showed good agreement with the value obtained from extrapolation on the observed dielectric data.

전기부품의 화재감식에 관한 연구

홍진웅 光云大學校 1992 論文集 Vol.21 No.-

Identification of the cause of fire ignitied electrically my be approached either by studying accident related electrical properties or by investigating power instruments at the place of accident. In the presented paper, the former approach is taken especially on investigating the consequences of over current induced by short circuiting of high power instrumentations which is reported as the primary cause electrical fire. In order to provide reliability of the identification method, microscopic photographs are taken for the cross sections of the electric parts after being exposed to over current and heated by external means respectively. The results are consequently compared and analysed.

저점도 실리콘유의 유전특성에 관한 연구

홍진웅 光云大學校 1995 論文集 Vol.24 No.-

Silicone oils used insulating substances exhibits both the organic and inorganic properties, and it has many superior characteristics, such as the high thermal resistance and low thermal oxidation level when compared to other dielectric liquids. In order to investigate the dielectric characteristics, silicone oils of viscosity 1, 2, 5[cSt] had been chosen as the specimen and experiment has been performed in the temperature range of -70[℃] - 65[℃] and frequency range of 30 - 1 ×10? [Hz]. As a result, the linear decrease of loss at low frequency region in high temperature was due to the influence of applying frequency, whereas the increase of loss sat high frequency region was contributed by electrode's resistance. And increasing visosity, the activation energy increased from 3.77[㎉/mole] to 7.21[㎉/mole]. The dipole moment of specimen was become clear 1.48 - 2.26[debye] at high temperature region and 1.054 - 1.80 [debye] at low temperature region respectively.

조명기구배치에 따른 조도향상과 에너지 절약

홍진웅,이종필 광운대학교 신기술연구소 1999 신기술연구소논문집 Vol.28 No.-

학교의 조명기구 안정기는 전자식 안정기 에너지 기자재 2등급 이상의 고효율 안정기로32[W]의 형광등 기구를 사용하고 있다. 그리고 교육환경을 위한 적절한 교실조도는 300[lx] ~ 600[lx]로 규정하고 있어, 현재 수업중인 학교교실 2개교를 선택하여 조도를 측정하였다. 최근에는 교실에 실제 등기구를 설치하지 않고 컴퓨터를 이용한 시뮬레이션 방법을 이용하여 조도를 계산하므로 경제성을 향상시키고, 계산의 오차도 크게 줄이는 방법 등이 제시되고 있다. 따라서 본 논문에서는 교실의 실측조도와 시뮬레이션 한 2,3차원의 조도분포에 따른 균제도 등을 비교 검토하였고, 또한 교육환경의 조도향상과 에너지의 절약을 위해 시뮬레이션을 시행한 결과 파라보릭 루바형 조명기구를 수직 배열한 것이 수평 배열한 것보다 균제도 25[%], 조명을 1[%] 개선되고, Raceway방식은 같은 조도의 다른 배열방식의 단위 면적 당소비전력이 15[%]의 절감효과를 얻었다. For the school's lighting system, Fluorescent lamps of 32[W] are used which is the electronic ballast of high-efficiency lamp graded second place among the energy equipments. To maximize the educational environment, the illuminance of classroom should be controlled between 300[1x]~ 600[Ix]. So we selected two classroom of a school to measure the illuminating level. Recently, in order to increase the efficiency and to decrease an error of calculation, the lighting fixtures have been arranged by using computer simulation. In this paper, their is a comparison between the measured illuminance and illuminance distribution due to the uniformity ratio of 2 or 3 dimensions by simulation. To increase the educational environment's illuminance and to maximize the efficiency of the electrical energy, using vertical alignment of parabolic-louver type lighting fixture is recommended. Since it will improve about 25[%]of uniformity ratio and about l[%]of co-efficient of utilization rather than horizontal alignment. Also, there is 15[%]decrease of power consumption per unit area by using Raceway type.

Hydrophone 변환기의 개발을 위한 고분자 재료에 관한 연구

이준웅,김재환,홍진웅 光云大學校 1991 論文集 Vol.20 No.-

In order to manufacture the ultrasonic transducer, corona electrets techniques were applied on PTFE and PVF film. The corona electrets of PTFE were experimented to measure thermally stimulated current (TSC) in the temperature range from -200 to 200[℃]. Four peaks were obtained at the temperature of 170, 90, 30, -40[℃] respectively. The origins of α peak at 170[℃] of PTFE seems to be attributed to detrapping in the amorphous regions. β peak at 30[℃] is responsible for the dipole and trapped electron near the glass transition temperature, the γ peak appearing at 30[℃] was considered as detrapping at the first transition temperature. The δ peak at -40[℃] looked to be attributed to depolarization of [-CF₂-O-] groups by CF₂'s rotational motion. As a results, PVF corona electret, three peaks of α, β and δ were obtained around 40, -40 and 90[℃] respectively. The origin of These peaks, α peak seems to turn up by the detrapping of the carriers trapped in main chains and side chain in the amorphous regions. Second, β peak is believed to show up by virtue of carbonyl group. Finally, δ peak looks to be ascribed to the detrapping of the carriers trapped in the amorphous region, or the border between the amorphous and crystalline regions.