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The Brightness Characteristics of the V- grooved LGPs Carved with Heated Tip
Kyuman Choi,JoonMo Lee,Yunsik Lee,SeungMok. Lee 대한전자공학회 2010 ICEIC:International Conference on Electronics, Inf Vol.1 No.1
LGP referred as an important component in a back light unit of the LCD. Appropriate cutting conditions of the tip were investigated followed by the LGP was fabricated using the previously optimized tip. The tip was heated to make the V-groove which possessed the depths of tens to hundreds ㎛. The brightness and brightness uniformity characteristics of the LGP fabricated in this experiment were found to be about 20% and 15% higher than that of the commercial products.
최규만(Kyuman Choi),심재경(Jaekyung Shim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study addresses the development of a riding toy with 3 degree of freedom(DOF) motion. A typical riding toy has one input power and it is steered by a handle. However, if omnidirectional wheels are used, the riding toy can perform 3DOFs motion on a 2-dimensional plane by an appropriate combination of input powers without any additional steering means. These input powers are one foot-driven power and two hand-driven powers. In this study, an alternate wheel mechanism is selected for an omnidirectional riding toy; each rear wheel is connected to a differential gear set. This decoupling mechanism improves the intuitional operation of the omnidirectional riding toy. Ergonomics is considered into the design of the omnidirectional riding toy on the basis of accumulated data for physical condition of humans. In this study, the driving mechanism is proposed by simulating a human body as a 4-bar linkage. Each of driving torques of the omnidirectional riding toy is compared with the human strength in each direction. The simulation results show that higher input power is required for the complex motion of the omnidirectional riding toy such as rotational motion but independent motion with one direction only can be obtained by a relatively small input power and the omnidirectional riding toy can be operated at the same speed as typical riding toys with a low speed ratio. Accordingly, the omnidirectional riding toy can be used by 6-7 year-old-boys who have low physical strength.
Choi, Jaecheol,Kim, Kyuman,Jeong, Jiseon,Cho, Kuk Young,Ryou, Myung-Hyun,Lee, Yong Min American Chemical Society 2015 ACS APPLIED MATERIALS & INTERFACES Vol.7 No.27
<P>A highly adhesive and thermally stable copolyimide (P84) that is soluble in organic solvents is newly applied to silicon (Si) anodes for high energy density lithium-ion batteries. The Si anodes with the P84 binder deliver not only a little higher initial discharge capacity (2392 mAh g<SUP>–1</SUP>), but also fairly improved Coulombic efficiency (71.2%) compared with the Si anode using conventional polyvinylidene fluoride binder (2148 mAh g<SUP>–1</SUP> and 61.2%, respectively), even though P84 is reduced irreversibly during the first charging process. This reduction behavior of P84 was systematically confirmed by cyclic voltammetry and Fourier-transform infrared analysis in attenuated total reflection mode of the Si anodes at differently charged voltages. The Si anode with P84 also shows ultrastable long-term cycle performance of 1313 mAh g<SUP>–1</SUP> after 300 cycles at 1.2 A g<SUP>–1</SUP> and 25 °C. From the morphological analysis on the basis of scanning electron microscopy and optical images and of the electrode adhesion properties determined by surface and interfacial cutting analysis system and peel tests, it was found that the P84 binder functions well and maintains the mechanical integrity of Si anodes during hundreds of cycles. As a result, when the loading level of the Si anode is increased from 0.2 to 0.6 mg cm<SUP>–2</SUP>, which is a commercially acceptable level, the Si anode could deliver 647 mAh g<SUP>–1</SUP> until the 300th cycle, which is still two times higher than the theoretical capacity of graphite at 372 mAh g<SUP>–1</SUP>.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/aamick/2015/aamick.2015.7.issue-27/acsami.5b03364/production/images/medium/am-2015-03364z_0014.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/am5b03364'>ACS Electronic Supporting Info</A></P>