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PCM 기반 메인 메모리 수명 향상을 위한 K-Gap Wear-Leveling 알고리즘
김호권(Hokwon Kim),한영선(Youngsun Han),김선욱(Seon Wook Kim) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
As process technology scales down to deep sub-micron, DRAM technology is facing critical scalability challenges due to precise charge placement and sensing hurdles in deep sub-micron processes. As a DRAM alternative, PCM (Phase Change Memory) has attractive points in aspect of cost and energy efficiency. However, limited write endurance is the major challenge for PCM main memory implementation. We propose K-Gap wear-leveling technique to prolong the lifetime of PCM as long as possible. Our proposed technique is designed to improve changing the position of Gap to instantly spread hot spots differently from the conventional Start-Gap scheme requires a lot of Gap movement for the spreading. Our experiments show that our proposed scheme extends PCM lifetime up to 1.2x against the Start-Gap wear-leveling technique.
다양한 캐릭터 구현을 위한 3D 프리비즈 캐릭터 라이브러리 연구
김호권(Hokwon Kim) 동국대학교 영상문화콘텐츠연구원 2016 영상문화콘텐츠연구 Vol.10 No.-
본 연구의 목적은 미국 광고기획 분야에서 제작되고 있는 3D 프리비즈 제작에 사용되는 있는 3D 캐릭터 라이브러리 데이터 분류기준과 구축방법과 분석을 통하여 국내 3D 캐릭터 관련 제작 분야에 적용하는데 있다. 3D 콘텐츠 제작에 있어서 3D 캐릭터 구현은 작업시간이 오래 걸리고 제작비가 많이 부분이지만, 이를 데이터베이스화할 수 있다면 다양한 콘텐츠의 3D 프리비즈, 게임, 시뮬레이션, 스마트 콘텐츠 등 여러 관련콘텐츠 분야에서의 활용이 가능하다. 3D 기술의 도입 이후 관련분야에서 제작 과정의 효율성과 다양한 표현들을 위하여 3D 모델링, 리깅, 애니메이션, 텍스쳐 등에 대한 데이터베이스 연구들이 행해져 왔지만 방대한 양의 데이터제작과 분류 및 구축방법, 구현범위, 구현방법에 해결책을 찾아내기가 쉽지 않았다. 최근 국외 업체들이 제공하는 3D 캐릭터들의 품질은 우수하지만, 3D 콘텐츠 제작에 있어서 캐릭터 생김새나 스타일의 변형이 자유롭지 못하여 적용범위가 넓지 않은 것이 단점이다. 3D 관련 작업자들이 자유롭게 변형하여 원하는 캐릭터를 구현할 수 있어야 그 적용범위가 넓고 다양해 질 것이다. 캐릭터 구현에 대한 경우의 수를 고려하여 공통분모를 찾고 최소한의 데이터를 사용하여 최대한의 표현이 가능해야만 데이터베이스로써의 역할을 할 수 있을 것이다. 본 연구에서는 미국 광고기획 분야에서 활용되고 있는 3D 프리비즈 캐릭터 라이브러리 분류기준 및 구축방법을 분석하여 효율적이고 다양한 스타일의 캐릭터 구현을 위한 3D 캐릭터 라이브러리 데이터 분류방법을 연구하고자 한다. As of late, there has been an increased demand for 3D contents easy to accessible in various field such as film, commercial, game and smart contents. It takes long time to produce 3D contents such as 3D models, rigs, animation and textures. As a result, it has been studied how to make 3D contents efficiently in many ways. If it is possible to construct 3D contents as a database, it can be used to 3D previz, game, simulation and augmented reality fields. There are many well made characters provided by character companies. But it is hard to modify characters for giving body to various styles. The 3D users have to have the controls to modify and change 3D characters. In order to construct enormous 3D data as a database, we need to have classification method and construction method first. This study will analyze the 3D character library which is being used in TV commercial preproduction to get better classification standard for 3D character library.
High aspect ratio microdisplay and thin optical component for glass-like AR devices
Kang Chan-mo,Shin Jin-Wook,Choi Sukyung,Kwon Byoung-Hwa,Cho Hyunsu,Cho Nam Sung,Lee Jeong-Ik,Lee Hyunkoo,Lee Jeong Hwan,Kim Hokwon,Cho Ara,Park Sang Hyun,Kim Minseok,Park Soon-gi,Kim Youngjoon,Ha Jeon 한국정보디스플레이학회 2021 Journal of information display Vol.22 No.3
Organic light-emitting diode (OLED) microdisplays have attracted much attention as displays for small form factor augmented reality (AR) devices. To realize glass-like thin and wide field of view (FoV) AR devices, we designed a display module with a high aspect ratio microdisplay and a thin optical component. For the high aspect ratio microdisplay, we developed the color OLED microdisplay with a 32:9 aspect ratio and a 0.8-inch diagonal ∼2,490-ppi CMOS backplane. To express color and reduce optical crosstalk,wefabricated the color filter (C/F) patterning directly on the white OLED. We also developed a pin mirror lens with 11 pin mirrors to improve the optical efficiency and quality with a thin lens. By combining the microdisplay with LetinAR’s pin mirror lens, we successfully demonstrated an AR device with a wide horizontal FoV of 46° but with a small form factor 4mmlens.
Jun, Jaeyung,Choi, Kyu Hyun,Kim, Hokwon,Yu, Sang Ho,Kim, Seon Wook,Han, Youngsun Association for Computing Machinery 2018 Transactions on Design Automation of Electronic Sy Vol.23 No.2
<P>Recently, scaling down dynamic random access memory (DRAM) has become more of a challenge, with more faults than before and a significant degradation in yield. To improve the yield in DRAM, a redundancy repair technique with intra-subarray replacement has been extensively employed to replace faulty elements (i.e., rows or columns with defective cells) with spare elements in each subarray. Unfortunately, such technique cannot efficiently handle a biased distribution of faulty cells because each subarray has a fixed number of spare elements. In this article, we propose a novel redundancy repair technique that uses a hashing method to solve this problem. Our hashing technique reorganizes replacement regions by changing the way in which their replacement information is referred, thus making faulty cells become evenly distributed to the regions. We also propose a fast repair algorithm to find the best hash function among all possible candidates. Even if our approach requires little hardware overhead, it significantly improves the yield when compared with conventional redundancy techniques. In particular, the results of our experiment show that our technique saves spare elements by about 57% and 55% for a yield of 99% at BER 1e-6 and 5e-7, respectively.</P>
White organic light-emitting diode (OLED) microdisplay with a tandem structure
Hyunsu Cho,변춘원,Chan-Mo Kang,신진욱,Byoung-Hwa Kwon,Sukyung Choi,Nam Sung Cho,Jeong-Ik Lee,Hokwon Kim,Jeong Hwan Lee,Minseok Kim,Hyunkoo Lee 한국정보디스플레이학회 2019 Journal of information display Vol.20 No.4
Microdisplay is a key technology for realizing augmented reality (AR) and mixed reality (MR) devices, which have attracted much attention of late. Even though the operating voltage in the tandem structure is higher than that in the single structure, 2-stack tandem OLED exhibited 20,000 cd/m2 at 9 V, which is compatible with CMOS circuit driving. Due to its top-emitting geometry with a tandem structure, the OLED device with a well-controlled thickness exhibited a white spectrum with (0.26, 0.26) color coordinates. The pixel density of the fabricated microdisplay panel with a white tandem OLED was about 2350 pixels per inch, and the active area of the panel was 0.7 inch diagonally. The resolution of the panel was 1280×1024, corresponding to SXGA, and the maximal luminance was 3,000 cd/m2.