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Lee, Seokjae,Koo, Jaryong,Hyung, Gunwoo,Lim, Donghwan,Lee, Donghyung,Lee, Kumhee,Yoon, Seungsoo,Kim, Wooyoung,Kim, Youngkwan Springer 2012 Nanoscale research letters Vol.7 No.1
<P>We investigate multiple quantum well [MQW] structures with charge control layers [CCLs] to produce highly efficient blue phosphorescent organic light-emitting diodes [PHOLEDs]. Four types of devices from one to four quantum wells are fabricated following the number of CCLs which are mixed p- and n-type materials, maintaining the thickness of the emitting layer [EML]. Remarkably, such PHOLED with an optimized triplet MQW structure achieves maximum luminous and external quantum efficiency values of 19.95 cd/A and 10.05%, respectively. We attribute this improvement to the efficient triplet exciton confinement effect and the suppression of triplet-triplet annihilation which occurs within each EML. It also shows a reduction in the turn-on voltage from 3.5 V (reference device) to 2.5 V by the bipolar property of the CCLs.</P>
김금희 ( Kumhee Kim ),홍석영 ( Suk-young Hong ),유은진 ( Eun-jin Yoo ),고상호 ( Sang Ho Ko ),김명옥 ( Myoung Ock Kim ),김명진 ( Myoung-jin Kim ),김지혜 ( Jeehye Kim ),이진주 ( Jinjoo Lee ),임보라 ( Bo-ra Lim ),윤숙희 ( Suk-hee Yoo 한국환경분석학회 2018 환경분석과 독성보건 Vol.21 No.2
The results of environmental testing and inspection are important as objective data for judging whether the basic criteria of environmental policies and standards are fulfilled. The results of environmental testing and inspection are measured by standard methods of an environmental analysis (Environmental Test Standards (ES) and Korean Industrial Standards (KS)) for quantifying environmental pollutants in the test samples. Therefore, a procedure is required to provide objective evidence that the standards of environmental analysis are appropriate for use and are reliable and reproducible. This study is performed to establish a quality control plan for standard environmental test methods because the operation management of ES and KS are integrated into the National Institute of Environmental Research. The research conducted on the literature available from all over the world has made it possible to develop quality and validation method for the standard to meet the performance and quality level when test methods are developed. The validation of the environmental test methods in the European Union is carried out in two stages robustness test and inter-laboratory test. Parameters of robustness test include selectivity, sensitivity, detection limit, quantitation limit, medium effect, etc., and involves setting the minimum recommended number of tests and the target value. Therefore, this study aims to establish ‘Guidelines for Validation of Standards of an Environmental field’ to ensure uniformity and accuracy of the methods before enactments and amendments of ES and KS.
이금희,송미영,조형제,Lee KumHee,Song MiYoung,Cho HyungJe 한국정보처리학회 2005 정보처리학회논문지B Vol.12 No.2
3차원 가상현실 내에서 캐릭터 움직임 동작의 기술은 기존 방식인 키프레임 기법에 의존하던 것이 점차 동작 제어 기법을 활용하고, 보다 사실적이고 자연스러운 움직임을 생성해 내고자 하는 방향으로 발전해 가고 있다. 그러나 이러한 동작 제어 기법을 통해 가상현실의 지형 성질에 따라 적응적인 캐릭터의 동작을 표현하는데 한계가 있다. 즉, 대부분의 가상환경에서 캐릭터의 걷는 움직임은 일정하고 단조로운 동작만을 반복하여 표현하고 있어 관찰자로 하여금 지루함을 느끼게 하고, 지형의 조건이나 형태에 맞지않게 캐릭터의 발끝이 지면에 스며들거나 떠있는 등의 부자연스러운 동작으로 인해 사실감을 저하시킨다. 본 논문에서는 적은 매개변수들과 역운동학 방법을 적용하여 기본 걷기 동작을 표현하고, 지면의 성질을 마찰계수로 대표시켜 지면에 적응적인 걷기 동작의 생성 방법을 제안한다. 제안된 방법에서는 구심력과 마찰계수를 결합한 후, 이를 근거로하여 한 주기 동안의 걷는 동작을 분석하고 이를 기반으로 동작에 필요한 매개변수를 조정하여 지질에 따른 적응적인 캐릭터의 걷기 동작을 생성한다. In 3D virtual environment the description of character' s movement that has utilized the conventional key-frame technique is gradually being developed toward the application of motion control method to generate more realistic and natural motion. Even the motion control method, however, has the limitation for expression of character's motion adapted to the ground properties of virtual world. That is, the walking motions of character are not only, for the most part, so uniform simple and repeated often as to feel to be tedious, but also the unnatural motion in which the tips of the toes soak through a plane or float in the air discording with the conditions of terrain lowers the semblance of reality. This paper proposes an adaptive motion control method for human figure locomotion in virtual environments or games, in which the walking motion is dynamiccally adapted to the ground's sliding properties. We compute an optimal parameters for one cycle of walking motion adapted to the ground properties by combining the coefficient of friction and centripetal force, and therefrom we induce a set of nonskid speed corresponding to various sliding properties of the ground.