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Kim, Junoh,Lim, Hyung-June,Hwang, Yoon Kyun,Woo, Heeje,Kim, Jin Woong,Char, Kookheon American Chemical Society 2012 Langmuir Vol.28 No.32
<P>This study has established a robust and straightforward method for the fabrication of uniform poly(vinylamine) hydrogel capsules without using templates that combines the dispersion polymerization and the sequential hydrolysis/cross-linking. The particle sizes are determined by the degree of cross-linking as well as by the cross-linking reaction time, while the shell thickness is independent of these variables. Diffusion-limited reactions occur at the periphery of the particles, leading to the formation of hydrogel shells with a constant thickness. The treatment of the surfaces of hollow hydrogel capsules with oppositely charged biopolymers limits the permeability through the shell of species even with low molecular weights less than 400 g/mol. Furthermore, we demonstrated that the hydrogel shell phase decorated with Au nanoparticles can be optically ruptured by exposure to laser pulse, a feature that has potential uses in optically responsive drug delivery.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2012/langd5.2012.28.issue-32/la3017968/production/images/medium/la-2012-017968_0008.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la3017968'>ACS Electronic Supporting Info</A></P>
Optimization of a Liquid Lenticular System for 2D and 3D Conversion
Junoh Kim,Junsik Lee,Cheoljoong Kim,Dooseub Shin,Gyohyun Koo,Yong Hyub Won Institute of Electrical and Electronics Engineers 2017 IEEE photonics technology letters Vol.29 No.18
<P>This letter deals with a 2D and 3D convertible device implemented using a liquid lens. The electro-wetting on dielectric (EWOD) phenomenon was used to operate the liquid lens. The research aimed to display 3D images clearly by achieving the highest dioptric power. The 2D state and the 3D state were switched by a meniscus of two immiscible liquids, and concave to convex lens states were formed by the meniscus. In a previous iteration, during EWOD operation, the oil phase moved in unexpected directions. This movement degraded the total quality of the lenticular system when displaying the 3D state. Here, a method is suggested to avoid the phenomenon by controlling the area of the electrode. Since the dioptric power of the lens is determined by the contact angle of the oil and the water, the electrode location, which determines the volume of the oil phase, was investigated to obtain the maximum dioptric power range. The two liquids were dosed into transparent chambers where the dielectric layer and the electrode were deposited. Finally, the highest diopter was achieved, which showed improved 3D image quality.</P>
연준오(Junoh Yeon),김경우(Kyoungwoo Kim),최현중(Hyunjuong Choi),양관섭(Kwanseop Yang),김경호(Kyungho Kim) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
The 1st assessment (performance test) was applied to assure the floor impact sound performance for developing the dry double- floor with the change of rubber hardness of the upper panels support and the ceiling structure of the sub-floor. Depends on the change of the rubber hardness in substructure, the heavy-weight sound impact value is improved up to 3 dB, and the light-weight sound impact value is moved up to 21 dB, comparing with the bare-slab. Also, the improved value for the floor impact sound conjugating with the sub-floors ceiling was 5dB. Based on this result, the 2nd assessment (performance test) was made the state that the rubber hardness of the sub-floor support was ranged between 50 and 70 for considering the stability of walking patients. In addition to this process, the assessment was carried out with a variety of ceiling structure applied to the dry doublefloor structure with the air flow system on the sub-floors ceiling. The result for the 2nd assessment proved that TYPE-11 had the better sound reduction performance in the heavy-weight impact sound test than other types, and also for the light-weight impact sound TYPE-11 had the 29 dB sound reduction performance overall. Henceforth, based on the result the research for the sound reduction performance from the floor impact sound shall be ongoing process as well as the development of a double-dry floor and a sound reduction ceiling to suitable on the field.
Electrowetting Lenticular Lens for a Multi-View Autostereoscopic 3D Display
Cheoljoong Kim,Junoh Kim,Dooseub Shin,Junsik Lee,Gyohyun Koo,Yong Hyub Won IEEE 2016 IEEE Photonics Technology Letters Vol.28 No.22
<P>The multi-view autostereoscopic display has become a major form of technology for implementing 3D displaying because of its simple structure and good image characteristics compared with other methods. In particular, the lenticular type multi-view display has a higher luminance than the parallax barrier type display, which is a significant advantage. However, the lenticular lens is difficult to fabricate and uncontrollable in 2D-3D conversion. Here, we describe the fabrication of an electrowetting-based lenticular lens and a multi-view display system that utilizes that lens. With a lenticular shaped lens chamber and electrowetting liquids, the focal length of the lenticular lens can be controlled by applying voltage. By putting this device on a display panel, a 3D image can be observed with a convex lens state, and a 2D image is observed with a flat state. In this letter, an electrowetting lenticular lens is fabricated and a 2D and 3D mode switch multi-view display is demonstrated.</P>
4G networks의 멀티미디어 멀티캐스트 서비스에서 PSNR기반의 효율적인 Resource allocation
김준오(Junoh Kim ),권용일(Yong Il Kwon),서덕영(Doug Young Suh) 한국방송·미디어공학회 2011 한국방송공학회 학술발표대회 논문집 Vol.2011 No.7
최근 비디오 스트리밍과 대화형 비디오 서비스 등과 같은 광대역 멀티미디어 서비스를 지원하기 위하여 Wimax와 같은 4G 무선네트워크 시스템 기술이 발전해 왔다. 4G 무선네트워크의 OFDM(Orthogonal Frequency Division Multiplexing)과 MIMO(multi Input Multi Output)은 사용자들에게 매우 유연한 QoS(Quality of Service) 서비스를 제공해 줄 수 있다.[1] 이 논문에서는 다양한 네트워크 상황에서 멀티캐스트 그룹에게 효율적인 방법으로 통신 자원을 할당하기 위해 OFDM 방법을 사용 하였다. 이에 본 논문에서는 한 셀(cell) 내의 서로 다른 멀티캐스트의 그룹의 다른 SNR(Signal to noise Ratio)의 사용자 분포에 따른 적응적인 scalable 비디오 멀티캐스트 방식을 제안한다. 더 나은 수신율을 가진 사용자는 최적의 MCS(Modulation and Coding Scheme) 할당을 통해 서로 다른 화질의 scalable 비디오 계층 중 높은 해상도의 비디오를 받을 수 있다. 논문에서는 전체 전송률을 최적화 하는 대신 전송받은 전체 비디오의 평균 화질을 최적화하는 방법을 제안한다.