• 한국주거학회논문집
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• 제15권6호
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• pp.1-13
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• 2004

As the provision of National Rental Housing has led the consciousness on rental housing changed, it becomes more necessary to improve the quality of rental housing. The purpose of this study is to analyze the inner space use of a unit and residents' consciousness on the results of surveying the residents in order to construct rental housing which provides comfort residental environment for the residents. Data was collected through questionnaire surveys(459 residents) from 5 estates including 3 estates of National Rental Housing and 2 estates of Public Rental Housing, which is $36m^{2}\;and\;45m^{2}$ of net area of a unit, for the actual use conditions and their requirements on the inner space of a unit. The results are as follows ; 1) The rental housing differentiated according to the needs from the residents' characteristics should be developed. 2) The main demand household for rental housing is established to that of 4 families including a 40s year-old couple and that of 3 or 4 families including a 30s year-old couple, and a double income family. But the type of household becomes more diverse than before. 3) It is necessary to plan the living room for the Multi-functional inner space emphasizing commom space 4) The various and efficient storage space and system for the residents' demands.

• 대한소아치과학회지
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• 제30권2호
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• pp.229-237
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• 2003

본 연구는 기존의 할로겐광(XL 3000, 3M, U.S.A.)과 비교하여 새로운 중합광원인 플라즈마광(Flipo, LOKKI, France)과 Light Emitting Diode(이하 LED, Elipar Free light, 3M, U.S.A.)광의 효율성을 평가할 목적으로 시도되었다. 이에 본 연구에서는 첫째, 일정 광도 하에서 플라즈마광과 LED광의 중합시간에 따른 중합도의 변화를 검토하여 할로겐광의 미세경도와 유사한 광조사 시간을 알아보고, 둘째, 중합반경에 따라 균일한 중합이 이루어지는지를 보기 위해 광조사 부위의 중심부와 외측 변연부에서의 중합도의 차이를 비교하였다. 2mm 두께의 복합레진 시편의 상면과 하면의 미세경도의 측정을 통해 중합도를 평가, 비교해 본 결과 다음과 같은 결론을 얻었다. 1. Z-100의 미세경도 측정치 비교에서, 대조군인 할로겐광을 40초 적용한 경우는, 플라즈마광 6-9초, LED광 40-60초를 적용한 경우와 유사하였다(P>0.05). 2. Tetric Flow의 미세경도에서는 대조군인 할로겐광을 40초 적용한 경우, 플라즈마광 9초, LED광 40-60초를 적용한 경우와 유사하였다(P>0.05). 3. Dyract AP의 경우, 할로겐광 40초를 조사한 것은, 플라즈마광 6-9초, LED광 20-40초를 적용한 경우와 유사하게 나타났다(P>0.05). 4. Fuji II LC에서는 할로겐광을 40초 적용한 경우가, 플라즈마광 9초, LED광 20-60초를 적용한 경우와 유사하게 나타났다(P>0.05). 5. Fuji II LC를 제외한 모든 시료에서 할로겐, 플라즈마, LED광 모두 시편의 중앙에서 외측으로 갈수록 미세경도는 유의하게 감소되었다(p<0.05).

• Journal of Information Display
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• 제12권4호
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• pp.167-171
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• 2011

The angular distribution of the luminance on each optical component of 40-inch light-emitting diode backlight was measured and studied, using the optical-simulation method. Several scattering functions were investigated as the reflection distribution function of the scattering dots printed on the bottom surface of the light guide plate (LGP). It was found that both the diffuse Lambertian and near-specular Gaussian scattering functions were necessary for the successful reproduction of the experimental angular distribution of the luminance. The optimization of the scattering parameters included in these scattering functions led to almost the same luminance distribution as that obtained from the experiment. This approach may be an effective way of indirectly estimating the reflection distribution function of the scattering dots of the LGP, which cannot be made accessible through any other experimental method.

• 대한화학회지
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• 제45권2호
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• pp.156-161
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• 2001

여러 가지 산화상태의 폴리아닐린을 화학적으로 합성하여 FT-IR, UV-Vis, GPC, TG-DTA로 측성 분석하였다. ITO 기관위에 다양한 산화상태의 LEB-PAN/NMP 용액으로 스핀코팅하고, AI 전극을 진공증착하여 단일층 발광다이오드를 제작하고 I-V 특성과 EL 스팩트럼에서 완전환원형인 LEB 함량이 증가할수록 ${\pi}$-${\pi}$* 전이의 장파장이동과 분자 엑시톤 전이 세기가 감소하고 PL과 EL 세기가 증가하는 것을 확인하였다. ITO/LEB/AI 구조의 LED에서 작동 전압은 5V 이었다. 백색광은 단지 폴리아닐린의 환원형 구조에서만 발광하는 것을 확인하였다.

• Journal of Power Electronics
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• 제15권4호
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• pp.861-875
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• 2015

This paper presents a wide frequency range LLC resonant controller IC for LED backlight units. In this paper a new phase-domain resonance deviation prevention circuit (RDPC), which covers a wide frequency and input voltage range, is proposed. In addition, a wide range gate clock generator and an automatic dead time generator are proposed. The chip is fabricated using 0.35 μm BCD technology. The die size is 2 x 2 mm2. The frequency of the clock generator ranges from 38 kHz to 400 kHz, and the dead time ranges from 300 ns to 2 μs. The current consumption of the LLC resonant controller IC is 4 mA for a 100 kHz operation frequency using a supply voltage of 15 V.

• 생물환경조절학회지
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• 제28권2호
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• pp.143-149
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• 2019

본 연구는 활착실 내의 인공광원으로 사용되는 LED 모듈의 광질 및 점멸주기가 오이접목묘의 활착 및 생장특성에 미치는 영향을 분석하고자 수행되었다. 이를 위해서 LED 모듈의 광질을 4수준(청색광, 적색광, 청색광/적색광 혼합, 백색광)으로 설정하였다. 또한 점멸주기를 4수준(5s/5s, 7s/3s, 9s/1s, control)으로 설정하였다. 대조구의 명기와 암기는 12h 간격으로 반복되었다. 활착실 내의 광합성유효광양자속, 기온 및 습도를 각각 $100{\mu}mol{\cdot}m^{-2}{\cdot}s^{-1}$, $25^{\circ}C$, 90%로 조절하였다. 오이접목묘의 활착에 미치는 광질의 효과는 5s/5s의 점멸주기를 지닌 청색광 처리구를 제외하면 유의차가 나타나지 않았다. 더구나, 점멸주기와 무관하게 적색LED, 청색/적색 혼합 LED, 백색 LED 처리구에서의 활착율에 유의차가 없었다. 이러한 결과는 접목묘의 활착에 미치는 광질 또는 점멸주기의 영향이 없음을 의미하는 것이다. 오이접목묘의 엽장, 엽면적, 생체중에 미치는 광질과 점멸주기의 영향은 청색 또는 적색LED의 9s/1s 주기에서 유의차가 인정될 만큼 높게 나타났다. 백색LED하에서 활착된 오이접목묘의 생장에 미치는 점멸주기의 영향은 유의차가 없었다. 따라서 백색LED 모듈의 지속적인 수요 증가와 제조단가 등을 고려할 때 활착용 조명으로 백색LED의 활용이 경제적으로 유리할 것이다.

• Asian Journal of Innovation and Policy
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• 제1권2호
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• pp.200-218
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• 2012

Estimating the economic life of a technology is the first important prerequisite step in the feasibility analysis of technology-based business. Many empirical studies have concentrated on patents data to estimate the time period for a technology. However, it is recommended to estimate it along with qualitative considerations of future technological and market conditions. In this regard, little is known about how approaches are applied. This paper aims to establish a structural framework of estimating the lifetime of a technology by integrating the outputs of an analysis of the determinants in each transition of a product life cycle. We describe an illustrative case about a light emitting diode (LED) backlight unit (BLU) technology for the liquid crystal display (LCD) TV. The framework allows valuators and experts to estimate a technology lifetime by using multidimensional factors.

• 한국미생물·생명공학회지
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• 제27권5호
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• pp.399-403
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• 1999

For the production of trehalose, microorganisms capable of producing trehalose extracellularly were screened from the stock cultures in our laboratory. among them, Micrococcus luteus IFO 12708 showed the highest productivity of trehalose. For the increase of productivity, the mutant strai Hs-208 having higher trehalose production was selected with NTG(N-methyl-N'-nitrosoguanidine) mutagenesis, which led to the decrease of the specific activity of trehalose phosphorylase(3.2-fold) as compared to the wild strain. The optimum condition for the trehalose production was established as follows: 20g/l of glucose and 6g/l of tryptone were used as a sole carbon source and nitrogen source, respectively, and cultivations were carried out at 3$0^{\circ}C$ and pH 6.0. After 20hrs cultivation, addition of 20unit/ml penicillin G led to the higher conversion yield of trehalose. Under the optimum condition, 6.547g/l trehalose was produced with conversion yield of 32.7%.

• Journal of Information Display
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• 제11권2호
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• pp.39-44
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• 2010

The time dependences of the luminance properties of 55-inch CCFL and LED backlights and 32-inch FFL backlights with LCD panels were investigated during the warm-up time from the cold start. The long-term luminance maintenance curve of a standard CCFL was examined in a time window up to 5000 hours. These two time dependences are important characteristics from the viewpoint of initial picture quality and lifetime reliability, respectively. Empirical equations were suggested for the analysis of the time dependence of these luminance data. These approaches are expected to be helpful in predicting the luminance properties of backlights based on the luminance data obtained in a limited time window.

• 대한치과보존학회:학술대회논문집
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• 대한치과보존학회 2003년도 제120회 추계학술대회 제 5차 한ㆍ일 치과보존학회 공동학술대회
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• pp.565-566
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• 2003

The clinical performance of light polymerized composite resins is greatly influenced by the quality of the light curing unit used. Commonly used halogen light curing units(LCUs) have some specific drawbacks such as decreasing light output with time. To overcome this, the blue LED LCUs are newly developed and introduced. The purpose of this study was to observe the reaction kinetics and the degree of polymerization of composite resins when cured by different light sources and to evaluate the effectiveness of the blue LED LCUs compared with conventional halogen LCUs.(omitted)