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AC PDP에서 고콘트라스트 실현을 위한 구동 파형에 관한 연구
안양기,윤동한,An, Yang-Ki,Yoon, Dong-Han 대한전자공학회 2002 電子工學會論文誌-SC (System and control) Vol.39 No.6
본 논문에서는 종래의 한 프레임 내에서 매 서브필드마다 리셋구간에 램프파를 인가하던 구동 방식에서 한 프레임 내에 첫 번째 서브필드의 리셋구간에만 램프파를 인가하고, 나머지 서브필드에서는 유지방전을 실행한 셀 들만 초기화하여 고콘트라스트를 실현시킨 구동 파형에 대해 연구하였다. 실험결과 첫 번째 서브필드에서의 리셋구간에서만 램프파에 의해 광이 출력되고, 나머지 서브필드의 리셋구간에서는 광이 출력되지 않음을 확인하였다. 이것은 한 프레임 내에 10개의 서브필드를 사용할 때 종래의 구동 파형에 비해 어두운 화면에서 Background 휘도가 약 10배정도 낮음을 보여준다. 그리고 종래의 구동 파형에서 측정된 285:1의 콘트라스트 비율과 본 논문에서 사용한 구동 파형에 대해 측정한 3080:1의 콘트라스트 비율을 비교했을 때 약 10.8배정도 높아졌으며, 이로 인해 고콘트라스트를 실현시켰다. This paper proposes a method to drive an AC plasma display panel(PDP) with a significantly improved contrast ratio. In the proposed method, during the first sub-field of one frame, all PDP cells are reset by the ramp waveform, and during the other sub-fields, only the cells turned on in the previous sub-field are reset. No light is emitted during the reset period of every sub-field except the first sub-field. For a 10-bit picture, the luminance of the dark level for the proposed method is 10 times lower than that for the conventional method, in which the ramp waveform for the reset is used in every sub-field. Accordingly, the contrast ratio for the proposed method is 10 times higher than that for the conventional method. For the 10-bit picture, the measured contrast ratio was about 3080:1 for the proposed method and about 285:1 for the conventional method, resulting in 10.8 times increase in the contrast ratio. This result shows that the proposed method can realize an image with high contrast ratio.
마이크로프로세서를 이용한 디지털 전기인두기의 설계 및 제작
안양기,윤동한,An, Yang-Ki,Yoon, Dong-Han 대한전자공학회 2001 電子工學會論文誌-SC (System and control) Vol.38 No.5
본 논문에서는 마이크로프로세서를 이용한 디지털 전기인두기를 설계하여 기존의 아날로그 전기인두기와 비교 검토하였다. 설계된 디지털 전기인두기에서는 두 가지의 개선된 온도제어 특성을 보였다. 첫째로, 사용자가 설정한 온도와 인두팁의 실제 온도편차를 개선하였는데, 주위환경을 각각 $5[^{\circ}C]$와 $25[^{\circ}C]$에서 전기인두기의 설정온도를 $200[^{\circ}C]$, $300[^{\circ}C]$, $400[^{\circ}C]$, $480[^{\circ}C]$로 설정하였을 때, ${\pm}1.8[^{\circ}C]$를 벗어나지 않는 안정한 온도편차를 보였으며, 이를 실험으로 확인하였다. 두 번째, 사용자가 납땜할 때 인두팁에서 변하는 온도편차를 개선하였는데, 1[g]의 납으로 전기인두기의 설정온도를 $200[^{\circ}C]$, $300[^{\circ}C]$, $400[^{\circ}C]$, $480[^{\circ}C]$로 설정하였을 때, 아날로그 전기인두기는 $6[^{\circ}C]{\sim}10[^{\circ}C]$의 편차를 보인 반면, 설계된 디지털 전기인두기는 $2[^{\circ}C1{\sim}5[^{\circ}]$의 안정한 온도편차를 보였으며, 이를 실험으로 확인하였다. The digital iron using ${\mu}$ processor is designed and compared experimentally with the conventional analog Iron. Designed digital iron shows two improved temperature control characteristics. First, the reduction of the difference error between the user setting temperature and the real temperature of the iron tip is examined. When the iron temperature is set to $200[^{\circ}C]$, $300[^{\circ}C]$, $400[^{\circ}C]$, $480[^{\circ}C]$ at the environmental temperatures of $-5[^{\circ}C]$ and $25[^{\circ}C]$, it is examined that the tip temperature is very stable and its error is within ${\pm}1.8[^{\circ}C]$. Second, it is conformed that the temperature fluctuation of the iron due to the soldering is reduced manifestly. When the temperature of iron tip is varied from $200[^{\circ}C]$ to $480[^{\circ}C]$ with 1[g] solder, the temperature errors of the analog iron are measured to be from $6[^{\circ}C]$ to $10[^{\circ}C]$. In case of designed digital iron, however, these errors are much smaller and they are from $2[^{\circ}C]$ to $5[^{\circ}C]$.
안양기 ( Yang Ki An ),박종환 ( Jong Hwan Park ),홍경기 ( Gyeung Ki Hong ),장희수 ( Hee Soo Jang ),최성헌 ( Sung Hun Choe ),최종우 ( Jong Woo Choi ) 한국환경분석학회 2011 환경분석과 독성보건 Vol.14 No.4
Suspended solid (SS) is a particulate matter less than 2 mm in water and an important indicator of Environmental Water Quality. SS was traditionally analysed by weighing in laboratory. Recently, automatic continuous measurement of SS was included as a routine monitoring of Water Tele-Monitoring System (TMS) in Korea by "Law for Environmental Testing and Inspection" and by "Law for Water Quality and Aquatic Ecosystem Preservation." However, the standard material for this automated SS analysis is not well defined in the Korean official method. The research used microcrystalline cellulose which is the standard material of ISO 11923 as a reference material and used cellulose fiber medium and Inulin as comparative materials which have same molecular formula with microcrystalline cellulose. Recovery rates of microcrystalline cellulose, cellulose fiber medium, and Inulin were 100.1%, 100.5%, and 30.9%, respectively. Some part of Inulin was dissolved in distilled water, so it cannot be used for the standard material. The variation coefficients of microcrystalline cellulose, cellulose fiber, and inulin were 5.5%, 7.7%, and 6.0%, respectively. The correlations between laboratory SS and TMS results for all materials were very high (r > 0.99). It seems like that microcrystalline cellulose suggested by ISO can be the best standard material for TMS within the conditions tested in this research.
신기후체제가 주목하는 냉매의 경쟁력 및 관련 주요국 동향
명소영(Soyoung Myung),안양기(Yang-Ki An) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
There is a general consensus among Parties that the 2015 agreement will be a package of a legally-binding core agreement. Within the 2015 package, the core agreement should contain legal obligations for all Parties to submit, implement and regularly update Nationally determined contributions(NDCs) targeting. Therefore accomplihing NDCs target became to be a heavy burden for a party in UNFCCC. Mitigating the HFCs emission would provide effective way to meet NDC target for some country, because most of HFCs have high-GWP, and the demand and the emission of HFCs are also expected to increase rapidly. This paper covers the discussions on the HFCs emissions and the barriers, policies and actions to unlock mitigation potential in relation to HFCs emissions. HFCs mitigation options span across a wide range of sectors, which each have their own unique barriers to implementation. These barriers are divided into three categories: socioeconomic; institutional, legislative and regulatory; and technological. They are also specific to certain regions, evolve over time and depend on national circumstances. Policies and actions to reduce HFCs in the cooling sector are mostly aimed at reducing leakage, increasing recycling and promoting alternative cooling agents with lower GWP. The last few years have shown a rapid development of low-GWP cooling agents, which are increasingly applied, for example, in mobile air conditioners and the foam blowing industry. This is the result of regional and subregional HFC policies, which have created favourable market conditions. Even though South Korea is expected to be one of the major countries in HFCs emission, it is difficult to find a plausible action plan for reducing HFCs. In conclusion, South Korea should pay more attention to establishing policies and actions to reduce HFC emission. to effectively achieve NDC target and to protect and promote HFC-related home industry.