• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.437-440
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• 2000

This paper proposes a method to improve video quality on images that have blocking artifacts at block boundary. Block image transform coding suffers from blocking artifact that is a main cause of degrading video quality because of the quantization error of transform coefficients in quantization process. filtering and DPCM for DC components have been widely used to reduce blocking artifact. Recently, lots of works focus on the technique that minimizes block effects using discontinuity of block boundaries. In this paper, image blurring in decoding stage is improved by adding compensation factor to each transformed blocks so that discontinuity of block boundaries can be decreased. The compensation factor is applied on each block without much loss of edge components.

• 아동학회지
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• 제19권1호
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• pp.155-167
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• 1998

The purpose of this study was to analyze the quality of the constructive play of 3, 4 and 5 year-old children. The researchers used unit blocks as the instrument because they are the most representative examples of constructive play materials. The subjects were 73 children enrolled in a half-day early childhood education program. The children's block play was videotaped 8 times, for a total of 330 minutes. The videotapes were transcribed and assessments were made on the children's 233 constructions in terms of the developmental stage of block play, the variety of materials used, play duration, and play intensity. The data were analyzed through two-way ANOVA to check age and sex differences. The results showed that children's developmental stages of block play were low on the average and that girls did not show an active interest in block play. The results also implied that block play developed by play experience rather than by age. Therefore, this study was interpreted to highlight the importance of teachers' understanding, planning, and mediation of block play in order to induce high-quality constructive play.

• 한국환경보건학회지
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• 제30권2호
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• pp.167-172
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• 2004

In this study, we carried out the research for the recycling potential of the dyeing wastewater treatment sludges as construction materials. The incineration ash of sludges were solidified as interlocking block in condition of sludge/cement ratio 2.5%, 5.0% and 10%, respectively. Those interlocking blocks were cured for 3days, 7days and 28days in ambient air condition, respectively. The results of this research were summarized as follows: The dyeing wastewater treatment sludges was below the Korea Leaching Limit. After incineration, the ash was manufactured as interlocking block. Bendable strength over 50kg$_{f}$/$\textrm{cm}^2$ suitable for interlocking block was obtained only when the sample was cured for 7days at sludge/cement ratio 2.5% and 5.0%. Hygroscopic ratio of interlocking block was above the Korea Industry Standard. We think that recycling of the incineration ash from dyeing wastewater treatment sludges to interlocking block will have high potential possibility.y.

• 전기학회논문지
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• 제62권6호
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• pp.863-869
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• 2013

In this paper, we compared and analyzed for safety 1.2m rectangular anchor block and arch-type root anchor block. First, numerical analysis was performed three-dimensional nonlinear method by numerical model test using finite element analysis program "Visual FEA". Then, measure displacement of the surface of the earth after construct each anchor block at 14M electric pole and increase loads through field verification tests for safety evaluation.

• Korean Chemical Engineering Research
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• 제46권1호
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• pp.15-22
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• 2008

최근 메탈로센 촉매를 통한 올레핀 합성 기술의 발달로 폴리올레핀 블록공중합체를 제조할 수 있는 기술이 개발되었으며 향후 고분자 산업에 크게 기여할 것으로 기대되고 있다. 하지만 현재까지 폴리올레핀 블록공중합체의 특성에 대한 체계적인 연구가 보고되고 있지 못한 실정이다. 본 리뷰 논문에서는 결정질의 poly(ethylene) (E) 블록과 고무질(rubbery)의 블록을 가지는 선형 폴리올레핀 블록공중합체를 통하여 폴리올레핀 블록공중합체의 열가소성 탄성체로서의 열역학적, 기계적 특성 및 분자 구조의 효과 특성 등에 관하여 살펴보고자 한다.

• 한국통신학회논문지
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• 제35권11C호
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• pp.907-910
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• 2010

This paper presents the design of block lengths for irregular low-density parity-check (LDPC) codes based on the maximum variable degree $d_{{\upsilon},max}$. To design a block length, the performance degradation of belief-propagation (BP) decoding performance from upper bounds on the maximum likelihood (ML) decoding performance is used as an important factor. Since for large block lengths, the performance of irregular LDPC codes is very close to the Shannon limit, we focus on moderate block lengths ($5{\times}10^2\;{\leq}\;N\;{\leq}\;4{\times}10^3$). Given degree distributions, the purpose of our paper is to find proper block lengths based on the maximum variable degree $d_{{\upsilon},max}$. We also present some simulation results which show how a block length can be optimized.

• The Korean Journal of Pain
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• 제7권1호
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• pp.116-118
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• 1994

무수 알코올로 내장신경차단 완료후 양측 서혜부 상하의 지각 탈실, 이상감감이 합병되었다, 차단 6일 후부터 지속적 경막외차단을 시작하여 점차 이상감각 및 통증은 조절되었으며 지각탈실 부위도 점차 축소되었다.

• Journal of information and communication convergence engineering
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• 제4권4호
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• pp.131-135
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• 2006

In this paper, we discusses that the theoretical analysis is made for the performance of FS MC-CDMA by the aid of the Nakagami fading channels and the block error probabilities of the FS MC-CDMA in Nakagami fading channel are presented. The channel fading speed, slow or fast, is considered in evaluating block error probabilities. The effectiveness of diversity combining in improving block error performance is examined.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 하계종합학술대회 논문집(4)
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• pp.39-42
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• 2000

Motion estimation plays an important role for video coding. In this paper, we derive optimal search patterns for fast block matching motion estimation. By analyzing the block matching algorithm as a function of block shape and size, we can find an optimal search pattern for initial motion estimation. The proposed idea, which has been verified experimentally by computer simulations, can provide an analytical basis for the current MPEG-2 proposals. In order to choose a more compact search pattern for BMA, we exploit the statistical relationship between the motion and the frame difference of each block.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅲ
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• pp.1347-1350
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• 2003

본 논문에서는 instruction과 data cache로 나누어지는 L1 cache를 가진 시스템에서 instruction과 data cache 각각의 block 크기 변화가 전체 시스템의 성능에 미치는 영향을 고찰하였다. 이를 위하여 SPEC CPU 벤치마크 프로그램을 입력으로 하는 SimpleScalar를 이용한 시뮬레이션을 수행하였다. 본 연구를 통해서, instruction과 data 각각의 특성에 맞는 cache block 크기를 사용하는 것이 일률적인 cache block 크기를 사용하는 것에 비하여 전체 시스템의 성능을 더욱 향상시켜 준다는 것을 보여준다.