• Proceedings of the Korean Society of Broadcast Engineers Conference
• /
• 2014.11a
• /
• pp.1-3
• /
• 2014

본 논문에서는 하드웨어 HEVC 인코더의 화면간 예측의 구조를 제안한다. 제안된 화면간 예측은 정수화소 움직임 예측을 통해 코딩 트리 유닛 내 코딩 유닛 분할과 각 코딩 유닛의 분할모드를 결정한다. 그리고, 부화소 움직임 예측, Merge모드 판단을 통해 예측 유닛의 움직임 벡터를 확정하고 움직임 보상을 수행한다. 이 과정에서 율-왜곡 비용계산 및 보간 필터 등의 하드웨어 자원이 효율적으로 공유된다. 또한, 전력소모를 줄이기 위하여 코딩 유닛의 skip 여부의 조기 판단을 통해 부화소 움직임 예측 및 화면내-화면간 최종 예측모드 결정과정의 전부 또는 일부를 생략하는 방법을 제공한다. 제안된 화면간 예측을 포함한 하드웨어 HEVC 인코더를 구현하여 실험한 결과, 250 MHz 의 동작 주파수에서 초당 124 Mpixel 의 처리성능을 보였으며, HM-14.0 대비 PSNR 0.5~0.8 dB 수준의 화질열화를 나타냈다.

• Proceedings of the Korea Water Resources Association Conference
• /
• 2022.05a
• /
• pp.268-268
• /
• 2022

지진해일은 발생빈도는 높지 않지만, 한 번 발생하게 되면 막대한 피해를 일으킬 수 있다. 우리나라에서는 1,900년대 4건의 지진해일이 기록되었으며, 이로 인해 동해안 및 남해안 등에 인명피해 및 재산피해가 발생하였다. 또한 2011년 동일본 지진해일로 인해 후쿠시마 원자력 발전소 변전설비가 침수됨에 따라 냉각수 공급이 중단되고 방화벽이 파괴되어 방사능이 누출되어 큰 피해로 연결되었다. 이러한 피해를 저감하기 위해 지진해일 수치해석과 확률론적 분석방법 등 다양한 방법을 활용한 연구가 국내외 적으로 활발히 수행되고 있다. 본 연구는 확률분포기반 지진해일고 예측모델 개발을 위해 수치해석을 수행하여 지진해일고(tsunami heights)를 산출하고 결과값에 대한 적절한 확률분포 분석을 실시하는 것이다. 지진해일고는 원자력발전소에서 취수구를 통한 냉각수 공급가능 여부를 판단하기 위해 최대 지진해일고(maximum tsunami height)와 최저 지진해일고(minimum tsunami height)로 구분하였다. 지진해일 수치해석은 지진원(단층매개변수) 조사, 조사된 지진원 중 지진해일 수치해석 case 선정을 위한 파향선추적기법(wave ray tracing) 수행, 선정된 지진원에 대해 로직트리(logic tree) 기법 적용, 로직트리를 적용한 지진원 case에 대한 수치해석 순서로 수행하였다. 수치해석을 통해 산출된 최대 및 최저 지진해일고 자료를 기반으로 확률분포형을 선정하기 위하여 확률분포별 적합성 평가를 실시하였다. 선정된 분포를 기준으로 처오름 및 처내림높이와 관련된 다양한 변수간의 의존관계를 파악하였다. 향후, 파악된 의존관계를 기반으로 예측모델을 개발하여 수치해석 결과와 연계함으로써 국내에 적용할 수 있는 확률론적 지진해일재해도를 제시할 수 있을 것으로 판단된다.

• Journal of The Korean Society of Grassland and Forage Science
• /
• v.30 no.3
• /
• pp.205-216
• /
• 2010

Few spring sowing have been conducted on winter cereal crops for whole-crop silage use. Experiments were conducted during 2007 and 2008 at the Chungnam Agricultural Research & Extension Services. The objectives of this study were compared the spring sowing with the optimum season's sowing on growth, yield and feed quality in five winter cereal crops. The treatments consisted of 5 winter cereal crops, Youngyang (Barley, Spring habit I), Keumkang (Wheat, Spring habit II), Gogu(Rye, Spring habit estimated III), Shinyoung (Triticale, Spring habit estimated III), Samhan(Oat, Spring habit estimated II), and 3 planting dates, 18 October (optimum season's sowing), 23 February and 10 March in spring. Heading days as affected by spring sowing compared to optimum season sowing were delayed by 16~20 days in barley, wheat, rye and triticale, and 9 days in oat. The clipping dates at the optimal harvesting stage of each crop for round-baled silage in spring sowing was 8 June (yellow ripe stage) in barley, 25 May (10 days after heading) in rye, and 17 June in wheat (yellow ripe stage), triticale (milky stage) and oat (milky stage). The accumulative temperature from emergence to heading was significantly decreased as affected by spring sowing compared to optimum season's sowing, but that of sowing to emergence and that of heading to maturing was similar. The rate of spikes per tillering surveyed at each clipping date was 62.0-73.1 percent in barley, wheat, triticale and oat, and 56.0 percent in rye compared to that of optimum season sowing. The dry matter yield in spring sowing compared to 18 October was obtained about 71.7 percent in barley, 60.6 percent in wheat, 46.2 percent in rye, 70.2 percent in triticale and 110.9 percent in oat. It were increased in acid detergent fiber (ADF), neutral detergent fiber (NDF) and crude protein content, but decreased in digestible dry matter content(DDM) and relative feed value (RFV). The yield of DDM by spring sowing was decreased in barley, wheat, rye and triticale, but increased in oat. The yield of dry matter and DDM were higher in oat and triticale than that of barley, wheat and oat. So, regardless to clipping dates and cropping system, the appropriated crop for spring sowing was oat, and subsequently triticale and barley. It was not adopted for spring sowing in rye because of low rate of no. of spikes per tillers and yield. It was necessary eliminated winter growing nature by earlier sowing at the late of February after overwinter.

• Journal of the Korea Institute of Information Security & Cryptology
• /
• v.27 no.4
• /
• pp.981-987
• /
• 2017

Proliferation of cloud computing services brings about reduction of the maintenance and management costs by allowing data to be outsourced to a dedicated third-party remote storage. At the same time, the majority of storage service providers have adopted a data deduplication technique for efficient utilization of storage resources. When a hash tree is employed for duplicate identification as part of deduplication process, size information of the attested data and partial information about the tree can be deduced from eavesdropping. To mitigate such side channels, in this paper, a new duplicate identification method is presented by exploiting a multi-set hash function.

• Aerospace Engineering and Technology
• /
• v.6 no.1
• /
• pp.245-254
• /
• 2007

The on-board telemetry system of KSLV-1 transmits telemetry signal for the launch vehicle and satellite to ground telemetry system in real time. In ground telemetry system, antenna system acquires telemetry signals and transfers these to data processing system. Data processing system processes and recordes telemetry data and distributes it to each mission operator in order to monitor it the operation goes well or not. This document describes the configurations and functions of data processing system designed for efficient and appropriate processing of telemetry data.

• Proceedings of the Technology Innovation Conference
• /
• 2009.02a
• /
• pp.259-274
• /
• 2009

연구개발에 종사하는 연구자나 연구기획자들은 미래에 어떤 기술 또는 연구 분야가 각광을 받을지 파악하기 위해 정보를 수집하거나 분석한다. 그러나 방대한 정보 중에서도 정말 필요한 정보를 단시간내에 효과적으로 수집하기는 쉽지 않다. 기술기획이나 연구기획의 경우 현재의 연구동향이나 현황을 빠른 시간안에 정확히 파악하는 것이 주된 관심사이며, 이것을 지원해 줄 수 있는 연구방법론 중 하나가 계량서지학이다. 본 연구는 계량서지적 분석결과를 효과적으로 이해할 수 있도록 시각화 기법을 이용한 정보분석 방법론을 다룬다. 발표동향 분석, 공동연구네트워크분석, 수준지수분석, 특허인용네트워크를 통한 인용트리분석 등을 이용하여 전자종이(e-Paper)기술분야에 대해 분석하였다. 본 연구는 정보분석에 있어 비전문가라도 신속하게 정보분석 결과를 획득할 수 있도록 KISTI에서 개발한 정보분석시스템인 KnowledgeMatrix S/W와 이를 응용한 S/W를 활용한 방법론을 제시한다. 본 연구에서 사용한 방법론들은 실제로 연구사업에 활용하고 있거나 활용가능성이 매우 높은 방법론을 이용하였기 때문에 향후에도 널리 활용될 수 있을 것으로 판단한다.

• Journal of the Korea Institute of Information and Communication Engineering
• /
• v.16 no.3
• /
• pp.626-634
• /
• 2012

It is required that system can seamlessly identify and manage change history and comprehensive assessment of several types of data as well as individual information of feeding and water environment for scientific and systematic management of fish farming environment and fish farmer. In this study, we implemented the system which can present and simulate current status of water quality and feeding based on th historical data of them, and check changes of state step by step using visual C++. In addition, we proposed the entropy model which can be comprehensive analysis about water quality and feed status information based on knowledge of fisheries. It can be the foundation to create high-level environment model reflecting the more diverse fisheries knowledge such as disease.

• The Journal of The Korea Institute of Intelligent Transport Systems
• /
• v.11 no.3
• /
• pp.55-62
• /
• 2012

EZW, also known as Embedded Zerotree Wavelet, is a technique that allows transforming original images into wavelet, then again compressing images using the transformed data. This algorithm demonstrates a simple structure and remarkable effectiveness. This paper has reformed the EZW to improve a compression efficiency. Fundamentally, EZW evaluates the priority level of wavelet-transformed data and stores them into four different categories considering the priority level of the data as well as their location information. The four categories are represented as the symbols P, N, Z, and T. Here, P and N correspond to the volume of data and the priority level whereas Z and T show the location information of data. Each letter is stored through the process of dominant pass. However, here is when the data of Z and T are stored redundantly which lead to unnecessary increase of data volume. In this paper, we propose a modified version of Embedded Zerotree Wavelet algorithm, which is designed to efficiently reduce the volume of redundantly stored data using four additionally inserted symbols. We name it EEZW, Extended Embedded Zerotree Wavelet. The proposed algorithm demonstrates the efficiency verified by a number of image and confirms an outstanding result through the PSNR(Peak Signal To Noise Rate) values, which measure their quality of images.

• Clean Technology
• /
• v.25 no.2
• /
• pp.101-106
• /
• 2019

The aim of this study is to investigate the feasibility of an Ni-SA catalyst, which was prepared from nickel, kieselguhr, and alumina, for the hydrogenation of triglyceride in a bench-scale reactor. Ni-SA powders were prepared by precipitating nickel precursors on a silica and alumina support. The powder was reduced in a hydrogen flow, mixed with a saturated palm oil, and then cooled to prepare an Ni-SA catalyst tablet. The sizes of NiO crystals of a commercial Pricat catalyst and the Ni-SA catalyst prepared in this study were $35{\AA}$ and $38{\AA}$, respectively. The pore volume and pore size of the Ni-SA catalyst was much larger than the pore volume and pore size of the Pricat catalyst. In addition, the average particle size of the Ni-SA catalyst was much smaller than that of the Pricat catalyst. The triglyceride hydrogenation reaction was carried out in a semi-batch reactor using catalysts impregnated with oil and molded into tablets. It was found that the Ni-SA catalyst was superior to the commercial Pricat catalyst in triglyceride hydrogenation, which could be ascribed to the raw material and the products being less influenced by the diffusion resistance in the pores of the Ni-SA catalyst. The Ni-SA catalyst prepared in this study has the potential to replace the Pricat catalyst as a catalyst for use in the commercial process for hydrogenation of triglyceride.

• Korean Journal of Heritage: History & Science
• /
• v.44 no.4
• /
• pp.130-141
• /
• 2011

This paper examined the bleaching effect of the two types of gel made with neutralizing agent such as sodium meta silicate gel & triethylamine gel mixed with carbopol resin 940 & 934 which has thickness effect in broad pH region and mixed with 10% hydrogen peroxide. Sodium meta silicate gel(1.6g included) provided pH 10, the most suitable environment for bleaching. The result of comparison of the baseline colour changes(${\Delta}E*ab$) and colour changes according to time(${\Delta}E*ab$) is as following. Group1(carbopol 940, sodium meta silicate, Urea Hydrogen Peroxide) showed 112% efficiency at CS-2; 63.3% at CS-4; 87.4% at CS-6. Group2(carbopol 934, sodium meta silicate, Urea Hydrogen Peroxide) showed 77.3%, 67.3%, 109.6% at CS-8, CS-10, CS-12 respectively; CT-1, CT-3, CT-5 of Group3(carbopol 940, triethylamine, Urea Hydrogen Peroxide) showed 36.8%, 73.2%, 74%; In Group4(carbopol 934, triethylamine, Urea Hydrogen Peroxide), efficiency of CT-6, CT-8, and CT-10 was 81.7%, 95.4%, and 95.7%. The paper showed that various concentration of neutralizing agent such as sodium meta silicate and triethylamine have bleaching effect. Viscosity of the gel including sodium meta silicate was higher than the gel including triethylamine. High viscosity helps the bleaching gel sit on the smooth slope of the ceramics. As a result, sodium meta silicate is considered to provide thickening and bleaching effect required in producing 10% hydrogen peroxide gel.