• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.535-538
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• 2011

최근 모바일 기기가 활성화되면서 자바스크립트의 성능 향상이 이슈가 되고 있다. 적시 컴파일러를 탑재한 자바스크립트 엔진들이 등장하면서 이러한 요구를 충족하고 있다. 대표적 웹 브라우징 엔진인 WebKit의 자바스크립트 엔진인 SquirrelFish Extreme(SFX)는 콘텍스트 쓰레딩 방식의 적시 컴파일러를 사용하고 있다. 하지만 모바일 환경에서의 성능은 여전히 문제가 된다. 모바일 환경에서 많이 사용되는 ARM CPU를 위한 SFX의 적시 컴파일러는 가상 레지스터를 머신 코드에서 사용하기 위해 많은 수의 메모리 로드와 스토어를 사용하고 있다. 또한 ARM 아키텍처가 제공하는 레지스터를 제대로 사용하지 못하고 사용되지 않는 레지스터가 존재하고 있다. 사용되지 않는 레지스터를 활용하여 메모리 로드와 스토어를 줄이는 레지스터 프로모션을 적용하였다. 루프에서 머신 코드로 수행되는 바이트 코드를 중심으로 가상레지스터를 실제 머신 레지스터로 할당하여 메모리 로드와 스토어를 줄이고 일부 벤치마크에서 성능향상이 나타남을 확인 했다. 레지스터 프로모션의 효과를 더 증대하기 위해 레지스터 프로모션의 범위를 함수 전체로 넓히고 핸들러 함수 호출에서 발생하는 오버헤드를 줄이는 최적화가 필요할 것으로 보인다.

• Fibers and Polymers
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• v.6 no.1
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• pp.1-5
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• 2005

In this study, we attempted to evaluate a novel use of sericin-fixed silk fiber (SFx) as an immobilization support of enzyme. Sericin was fixed on the silk fiber using glutaraldehyde as a fixation reagent. After 6 hours of fixation, the degree of fixation increases linearly with linear decrease of the amount of bound $\alpha$-chymotrypsin (CT). This suggests that the increase of the degree of fixation is due to the further crosslinking of free aldehyde groups on the surface of sericin-fixed silk fiber (SFx). Even though perfect fixation was not achieved, sericin did not dissolve seriously and could be removed by further washing. The specific activity did not differ significantly after 6 hours of fixation. The activity of immobilized CT on SFx decreased to its half after 6 hours of incubation at 50$^{\circ}C$. However, it retained $78\%$ of initial activity even after 1 hour of treat­ment with $100\%$ ethanol. As a result, the SFx could be used as an immobilization support of enzyme in non-aqueous media at ambient temperature.

• The Science & Technology
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• v.34 no.12 s.391
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• pp.84-85
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• 2001

• Proceedings of the Korean Information Science Society Conference
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• 2010.06c
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• pp.540-544
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• 2010

모바일 환경에서 웹 브라우저 활용이 늘어나고 웹 페이지를 통한 다양한 서비스가 제공되면서 브라우저에서의 자바스크립트 성능이 중요한 요소가 되었다. 자바스크립트 엔진의 성능 개선을 위해 기존에 사용하던 인터프리터 대신에 머신 코드를 실행 시간에 생성하는 적시 컴파일러(JITC)가 도입되었다. 특히 모바일 환경에서 WebKit의 자바스크립트 엔진인 SquirrelFish Extreme(SFX)이 많이 사용되고 있다. 본 논문에서는 SFX의 성능 향상을 위하여 적시 컴파일러를 통해 생성된 머신 코드를 파일 시스템을 활용하여 파일에 저장하였다가 재사용하는 클라이언트 AOTC(ahead-of-time compilation) 방식을 제시하고 초기 실험 결과를 제시한다.

• Korean Chemical Engineering Research
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• v.60 no.2
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• pp.300-307
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• 2022

Time-resolved serial femtosecond crystallography (TR-SFX) is a powerful technique for determining temporal variations in the structural properties of biomacromolecules on ultra-short time scales without causing structure damage by employing femtosecond X-ray laser pulses generated by an X-ray free electron laser (XFEL). The mixing rate of reactants and biomolecule samples, as well as the hit rate between crystal samples and x-ray pulses, are critical factors determining TR-SFX performance, such as accurate image acquisition and efficient sample consumption. We here develop two distinct sample delivery systems that enable ultra-fast mixing and on-demand droplet injecting via pneumatic application with a square pulse signal. The first strategy relies on inertial mixing, which is caused by the high-speed collision and subsequent coalescence of droplets ejected through a double nozzle, while the second relies on on-demand pneumatic jetting embedded with a 3D-printed micromixer. First, the colliding behaviors of the droplets ejected through the double nozzle, as well as the inertial mixing within the coalesced droplets, are investigated experimentally and numerically. The mixing performance of the pneumatic jetting system with an integrated micromixer is then evaluated by using similar approaches. The sample delivery system devised in this work is very valuable for three-dimensional biomolecular structure analysis, which is critical for elucidating the mechanisms by which certain proteins cause disease, as well as searching for antibody drugs and new drug candidates.

• Journal of the Korean Society of Costume
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• v.61 no.5
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• pp.48-63
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• 2011

Digital makeup(DM), depending upon computer graphic softwares, is applied to various fields, e.g. character works in movie and game industries and visual printouts in printing works. Focused on makeup field, DM is extremely conducive to developing, scientizing and informationalizing makeup patterns. Despite of unlimited potential of DM of which market size has been growing day by day, its practical use by domestic makeup experts and educators is much less active than expected as far, due to the lack of knowledge accumulation. The purpose of this study is to suggest some theoretical frameworks to generalize DM techniques and analyze two cases using the frames therefore support academicians' recent efforts to theorize DM techniques. The study 1) defines and categorizes the concepts of DM and DFX(digital special effect); 2) reviews the literature relevant to DM and generalizes the types and methods of DM techniques; 3) applies general frames to analyzing two movie cases, famous for their DM effects; 4) then suggests, based upon analytical results, some efficient ways for makeup experts to use DM techniques in practice. This study contributes to providing the theoretical grounds to conceptualize DM thus broadening makeup artists' interests in DM and awakening the scholarly concerns in cultural technology including DM.

• Archives of design research
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• v.11 no.2
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• pp.5-14
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• 1998

The hopes for making vivid images of mankind made 'film' that reflects easy communications. Film have made satisfactions to imagination of man by varied experimental expressions from the beginning. Many of directors and producers were eager to make film to be with relevant views. At last film has making to do with the digital tool, so called 'Computer Graphics' . Making images through computers have changed more better with the developing skills of softwares. NASA has developed Aero-Simulations first, it have called computer graphics for the first time in history. The computer graphics can make images with very varieties that had not exprerienced before and we won't expect the upcomming skills of it. Special Effects(SFX) through the films began the genre of Science Fiction in the era of ideology and space competetions and producer George Lucas made the firm named ILMOndustrial Light & Magic) to making picture of SFX. At last 'Abyss', 'Terminator II', 'Toy Story' and 'Forrest Gump' have made to us with many splendid arangements by the computers. Especially, we can concluded that the relevant expressions as in 'Forrest Gump' is the unexpected charming and human images with wonder. In Korean films are less varied, relevant and reasonable than that of American films, in this study I hope to develope more natural Korean computer graphic in near future.

• Proceedings of the Korea Contents Association Conference
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• 2006.05a
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• pp.279-284
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• 2006

The field of film art to be wised expression as development of Media has grown. Recently, the concern and effort has built up in digital film by Computer Graphics(CG) one of SFX. In this paper, I certified the formative properties based on Gestalt theory and centering best show in 2005. As a result, I confirmed that to insert 3D animation in film can lead fantasy or virtual world unable to be felt in real world, with the intention of producer, and that it was applied to free space not to be restricted making a film of scenes. And I confirmed that the partial modeling animation as the Gestalt theory that gives totality to objects of perception and needs closure can play role of understanding the meaning of film.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2008.11a
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• pp.18-18
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• 2008

3차원 패키징 System In Package (SIP)구조에서 Chip to Chip 단위 Interconnection 역할을 하는 Through Silicon Via(TSV)를 형성하기 위하여 Pulsating RF bias가 장착된 Inductively Coupled Plasma Etcher 장비를 이용하였다. 이 Pulsating 플라즈마 공정 방법은 주기적인 펄스($50{\sim}500Hz$)와 듀티($20{\sim}99%$) cycle 조절이 가능하며, 플라즈마 에칭특성에 영향을 주는 플라즈마즈마 발생 On/Off타임을 조절할 수 있다. 예를 들면, 플라즈마 발생 Off일 경우에는 이온(SFx+, O+)과 래디컬(SF*, F*, O*)의 농도 및 활성도를 급격하게 줄이는 효과를 얻을 수가 있는데, 이러한 효과는 식각 에칭시, 이온폭격의 손상을 급격하게 줄일 수 있으며, 실리콘 표면과 래디컬의 화학적 반응을 조절하여 에칭 측벽 식각 보호막 (SiOxFy : Silicon- Oxy- Fluoride)을 형성하는데 영향을 미친다. 그리고, TSV 형성에 있어서 큰 문제점으로 지적되고 있는 언더컷과 수평에칭 (Horizontal etching)을 개선하기 위한 방법으로, Black-Siphenomenon을 이번 실험에 적용하였다. 이 Black-Si phenomenon은 Bare Si샘플을 이용하여, 언더컷(Undercut) 및 수평 에칭 (Horizontal etching)이 최소화 되는 공정 조건을 간편하게 평가 할 수 있는 방법으로써, 에칭 조건 및 비율을 최적화하는 데 효율적이었다. 결과적으로, Pulsating RF bias가 장착된 Inductively Coupled Plasma Etcher 장비를 이용한 에칭실험은 펄스 주파수($50{\sim}500Hz$)와 듀티($20{\sim}99%$) cycle 조절이 가능하여, 이온(SFx+, O+)과 래디컬(SF*, F*, O*)의 농도와 활성화를 조절 하는데 효과적이었으며, Through Silicon Via (TSV)를 형성 하는데 있어서 Black-Si phenomenon 적용은 기존의 Continuous 플라즈마 식각 결과보다 향상된 에칭 조건 및 에칭 프로파일 결과를 얻는데 효과적이었다.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2009.05a
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• pp.247-247
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• 2009

3차원 반도체 패키징에서 관통전극 Through Silicon Via (TSV)를 형성하기 위하여 이온과 래디컬의 활성도 조절이 가능한 pulsating inductively coupled plasma (ICP) 식각을 수행하였다. 본 식각공정에서는 펄스주파수 ($50{\sim}500Hz$)와 듀티 싸이클 ($20{\sim}99%$)을 조절하여, 플라즈마 내 이온과 래디컬들의 활성도 변화를 발생시켰다. 플라즈마 공정변수에 따라 식각형태가 달라짐을 S.E.M을 이용하여 확인했으며, 이온(SFx+, O+)과 래디컬 ($SF^*$, $F^*$, $O^*$)의 농도 및 활성도 변화를 측정하기 위하여 광학적 기술인 optical emissin spectroscopy와 전기적 특성 측정 기술인 Langmuir probe 시스템을 직접 제작 설치하여 펄스플라즈마를 진단하였다.