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ON MOTION COMPENSATION OF H.264/AVC SOFTWARE DECODER
Hyung-Su Jeon,Cheol-Jung Yoo,Ok-Bae Chang 한국멀티미디어학회 2006 한국멀티미디어학회 국제학술대회 Vol.2006 No.-
H.264/AVC is a new international video compression standard similar to ITU-T H.264 and ISO/IEC 14496-10. The H.264/Aye compression rate is improved more than double than MPEG-2, MPEG-4, and related technologies, but complexity of H.264/AVC decoder increased much more. There is motion to apply to a lot of field of application such as broadcasting (such as DTV) and field of storage system (PVR class) because of excellent compression performance. However, the question is that complexity increases because the calculation amount increases in H.264/AVC decoder. Memory bandwidth supporting HD-degree is required double from complex motion compensation of H.264/AVC than' MPEG-2 HD. H.264/AVC decoder is B-Picture and BP-Picture that compensate motion using two reference pictures. In this paper, can reduce existent complexity if decode compensating motion selecting a reference picture by proposed method. As a result, bit rate reduced and complexity and memory bandwidth decreased.
화면 예측 부호화를 위한 효율적인 메모리 관리기법에 관한 연구
전형수 ( Hyung-su Jeon ),정사균 ( Sa-kyun Jeong ),이윤채 ( Yoon-chae Lee ),유철중 ( Cheol-jung Yoo ),장옥배 ( Ok-bae Chang ) 한국정보처리학회 2006 한국정보처리학회 학술대회논문집 Vol.13 No.1
H.264는 기존의 압축 표준들보다 월등한 압축률을 가지고 있어 다양한 멀티미디어 서비스에 적합하다. 특히 적은 양의 데이터 전송으로 서비스 받을 수 있는 모바일 기기에서는 빼놓을 수 없는 기술이 되었다. 현재 모바일 기기에서 영상 서비스는 하드웨어 기반의 디코더 형식으로 되어 있기 때문에 소프트웨어 기반의 디코더 개발이 시급하다. 그러기 위해서는 모바일 기기에서 탑재된 적은 용량의 메모리를 사용하므로써 빠른 재생이 가능해야 한다. 그래서 영상 복호화시에 사용되는 메모리 양을 줄일 수 있도록 참조픽처의 메모리를 관리하는 방법을 제안한다. 기존의 고정크기를 갖는 장기 참조픽처를 배제하고 단기 참조픽처로써 대체하고 비참조 픽처의 사용은 POC(Picture Order Count)에 전체 사용하지 않고 단지 순서를 정하기 위해 메모리 로드없이 순서 조합에 필요한 위치만 갖도록 하였다. 그러므로, 모바일 기기에서 메모리의 사용을 최대한 줄여 영상을 재생할 수 있도록 제안하였다.
P2P 기반 서버 부하감소를 위한 가상서버 시스템 구현
전형수(Hyung-Su Jeon),이종구(Jong-Gu Lee),이윤채(Yoon-Chae Lee),유철중(Cheol-Jung Yoo),장옥배(Ok-Bae Chang) 한국정보과학회 2002 한국정보과학회 학술발표논문집 Vol.29 No.2Ⅲ
최근 네트워크에 대한 관심이 고조되면서 클라이언트/서버 방식을 통한 자료의 업 · 다운로드로 인하여 서버에 트래픽이 증가하는 문제점이 나타나고 있다. 그러므로, 기존의 단일 서버 형태에서 탈피하여 P2P 구조로 변화하여 가고 있다. 이때 중앙서버에 걸리는 부하를 줄이기 위하여 근거리의 클라이언트들을 결합하여 하나의 가상서버를 설정하여 중앙서버의 트래픽을 분산시키는 역할을 수행하는 서버 분산 시스템을 구축하여 설정된 가상서버들중에서 근거리부터 검색하는 형태로 더 빠른 검색을 하도록 하는 것이 본 연구의 목적이다. 본 연구에서는 중앙서버에 최초로 접속한 사용자가 동일 라우터 대역에서 가상서버 역할을 맡게 하고 가상서버의 능력을 고려하여 접속자 수의 제한을 두고, 제한된 수를 초과하는 접속자를 다른 가상서버로 설정하여 서비스를 이어갈 수 있도록 가상서버 시스템을 구축한다.
Charge-Directed Peptide Backbone Dissociations of o-TEMPO-Bz-C(O)-Peptides
Jeon, Aeran,Lee, Ji Hye,Kwon, Hyuk Su,Park, Hyung Soon,Moon, Bong Jin,Oh, Han Bin Korean Society for Mass Spectrometry 2013 Mass spectrometry letters Vol.4 No.4
In the present study, we report that the charge-directed (assisted) peptide dissociation products, such as b- and y-type peptide backbone fragments, were the major products in MS/MS and $MS^3$ applications of some o-TEMPO-Bz-C(O)-peptide ions, while radical-driven dissociation products, such as a/x and c/z-type fragments, were previously shown to be the major products in the free radical initiated peptide sequencing mass spectrometry (FRIPS MS). Those o-TEMPO-Bz-C(O)-peptides share a common feature in their sequences, that is, the peptides do not include an arginine residue that has the highest proton affinity among free amino acids. The appearance of b- and y-type fragments as major products in FRIPS MS can be understood in terms of the so-called "mobile-proton model". When the proton is highly mobilized by the absence of arginine, the chare-directed peptide dissociation pathways appear to be more competitive than the radical-driven dissociation pathways, in our FRIPS experiments.
The Effect of Extrusion Conditions on Water-extractable Arabinoxylans from Corn Fiber
Jeon, Su-Jung,Singkhornart, Sasathorn,Ryu, Gi-Hyung The Korean Society of Food Science and Nutrition 2014 Preventive Nutrition and Food Science Vol.19 No.2
The effect of feed moisture contents (30%, 40%, and 50%) and screw speed (200 rpm, 250 rpm, and 300 rpm) on the corn fiber gum (CFG) yield and soluble arabinoxylans (SAX) content of destarched corn fiber was investigated. The CFG yields and SAX contents of extruded, destarched corn fiber were higher than that of destarched corn fiber. In extruded, destarched corn fiber, increased screw speed and decreased feed moisture contents resulted in a higher SAX contents. The maximum yields of CFG obtained from extruded, destarched corn fiber were $79.1{\pm}19.0g/kg$ (30% feed moisture content) and $82.3{\pm}11.30g/kg$ (300 rpm screw speed). The highest SAX content was also observed at a screw speed of 300 rpm. The results of the present study show that water extraction and extrusion combined have the potential to increase CFG and SAX yields from corn fiber.
The Effect of Extrusion Conditions on Water-extractable Arabinoxylans from Corn Fiber
Su-Jung Jeon,Sasathorn Singkhornart,Gi-Hyung Ryu 한국식품영양과학회 2014 Preventive Nutrition and Food Science Vol.19 No.2
The effect of feed moisture contents (30%, 40%, and 50%) and screw speed (200 rpm, 250 rpm, and 300 rpm) on the corn fiber gum (CFG) yield and soluble arabinoxylans (SAX) content of destarched corn fiber was investigated. The CFG yields and SAX contents of extruded, destarched corn fiber were higher than that of destarched corn fiber. In extruded, destarched corn fiber, increased screw speed and decreased feed moisture contents resulted in a higher SAX contents. The maximum yields of CFG obtained from extruded, destarched corn fiber were 79.1±19.0 g/kg (30% feed moisture content) and 82.3±11.30 g/kg (300 rpm screw speed). The highest SAX content was also observed at a screw speed of 300 rpm. The results of the present study show that water extraction and extrusion combined have the potential to increase CFG and SAX yields from corn fiber.
Hyung Seok Yu,Na Kyoung Lee,Hye Lin Jeon,Su Jin Eom,Mi Young Yoo,Sang Dong Lim,Hyun Dong Paik 한국축산식품학회 2016 한국축산식품학회지 Vol.36 No.3
Benzoic acid is occasionally used as a raw material supplement in food products and is sometimes generated during the fermentation process. In this study, the production of naturally occurring yogurt preservatives was investigated for various starter cultures and incubation temperatures, and considered food regulations. Streptococcus thermophilus, Lactobacillus acidophilus, Lactobacillus delbrueckii subsp. bulgaricus, Lactobacillus rhamnosus, Lactobacillus casei, Lactobacillus paracasei, Lactobacillus reuteri, Lactobacillus plantarum, Bifidobacterium longum, Bifidobacterium lactis, Bifidobacterium bifidum, Bifidobacterium infantis, and Bifidobacterium breve were used as yogurt starter cultures in commercial starters. Among these strains, L. rhamnosus and L. paracasei showed the highest production of benzoic acid. Therefore, the use of L. rhamnosus, L. paracasei, S. thermophilus, and different incubation temperatures were examined to optimize benzoic acid production. Response surface methodology (RSM) based on a central composite design was performed for various incubation temperatures (35-44°C) and starter culture inoculum ratios (0-0.04%) in a commercial range of dairy fermentation processes. The optimum conditions were 0.04% L. rhamnosus, 0.01% L. paracasei, 0.02% S. thermophilus, and 38.12°C, and the predicted and estimated concentrations of benzoic acid were 13.31 and 13.94 mg/kg, respectively. These conditions maximized naturally occurring benzoic acid production during the yogurt fermentation process, and the observed production levels satisfied regulatory guidelines for benzoic acid in dairy products.