• 산업경영시스템학회지
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• 제45권1호
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• pp.1-9
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• 2022

The PoN (Proof of Nonce) distributed consensus algorithm basically uses a non-competitive consensus method that can guarantee an equal opportunity for all nodes to participate in the block generation process, and this method was expected to resolve the first trilemma of the blockchain, called the decentralization problem. However, the decentralization performance of the PoN distributed consensus algorithm can be greatly affected by the network transaction transmission delay characteristics of the nodes composing the block chain system. In particular, in the consensus process, differences in network node performance may significantly affect the composition of the congress and committee on a first-come, first-served basis. Therefore, in this paper, we presented a problem by analyzing the decentralization performance of the PoN distributed consensus algorithm, and suggested a fairness control algorithm using a learning-based probabilistic acceptance rule to improve it. In addition, we verified the superiority of the proposed algorithm by conducting a numerical experiment, while considering the block chain systems composed of various heterogeneous characteristic systems with different network transmission delay.

• Macromolecular Research
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• 제9권4호
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• pp.185-196
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• 2001

The self-assembly of block copolymers can lead to a variety of ordered structures on a nanometer scale. In this article, the self-assembling behaviors of triblock copolymers in the melt and the selective solvent are described with the results obtained from the computer simulations. With the advances of computing power, computer simulations using molecular dynamics and Monte Carlo techniques make it possible to study very complicated phenomena observed in the self-assembly of triblock copolymer. 13king full advantage of the computer simulation based on well-defined model, the effects of various structural and thermodynamic parameters such as the copolymer composition, the block sequence, the pairwise interaction energies, and temperature on the self-assembly are discussed in some detail. Some simulation results are compared with experimental ones End analyzed by comparing them with the theoretical treatment.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제43회 하계 정기 학술대회 초록집
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• pp.111-111
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• 2012

In this talk, we represent a novel approach to investigating intra-nanorod surface plasmon coupling with control over block compositions. The multi-component rod-like nanostructures, which consist of optically active components (Au and Ag) and optically less active component (for example, Ni) in UV-vis-NIR spectral window, showed interesting optical response depending on each block length and the total length of the structure. By controlling the composition and relative lengths of the blocks that comprise these structures, we can tailor the overall optical properties. Depending on the relative fraction of Au and Ag blocks, the intensity of the transverse modes varied without noticeable peak shifts. However, the strong intraparticle surface plasmon coupling resulted in the collective appearance of longitudinal LSP modes, including higher-order modes. The experimental observations were confirmed by theoretical calculation, using a discrete dipole approximation method. In addition, we will briefly discuss how single nanorod solar cells can be synthesized by using by using electrochemical deposition and AAO hard templates.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2009년도 춘계학술발표대회 논문집
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• pp.170-175
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• 2009

Apartment housing block has been spreaded according to rapid economic development and urbanization in Korea. A parking lot is located at underground, artificial ground is inevitably created in apartment housing block. Artificial ground creates different thermal environment compared to natural ground, because the composition and coverage of artificial ground are diverse. In this study, the effect of the artificial ground on building thermal environment will be disscussed by simulation. Considering the result of simulation, surface albedo is more important for building energy performance. A purpose of this study is to examine how the characteristic of surface effect to thermal environment, and to develop design method for sustainable outdoor space.

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.207-208
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• 2006

Here, we discuss various thermodynamic factors that affect the design of nanomaterials based on block copolymers. It is well known that the ordering behavior is determined by composition, chain size N, and the ubiquitous Flory. However, the recent discovery of ordering upon heating, immisibility loops, and baroplasticity addresses a clear need for further microscopic interpretation of such. in order to help to design nanomaterials at aimed purposes. Employing a perturbed hard sphere chain model, the molecular factors such as self and cross-interactions, free space distribution, and directional interactions are incorporated in. It is shown that not only typical ordering phenomena, but also the recent observations just mentioned are all described through this unified way.

• 전자공학회논문지B
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• 제31B권12호
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• pp.27-34
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• 1994

Block matching motion estimation is the most widely used method for motion compensated coding of image sequences. Based on a two dimensional systolic array, VLSI architecture and implementation of the full search block matching algorithm are described in this paper. The proposed architecture improves conventional array architecture by designing efficient processing elements that can control the data prodeuced by efficient search window division method. The advantages are that 1) it allows serial input to reduce pin counts for efficient composition of local memories but performs parallel processing. 2) It is flexible and can adjust to dimensional changes of search windows with simple control logic. 3) It has no idel time during the operation. 4) It can operate in real/time for low and main level in MPEG-2 standard. 5) It has modular and regular structure and thus is sutiable for VLSI implementation.

• 한국환경생태학회지
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• 제25권1호
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• pp.17-30
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• 2011

본 연구는 강동구 가래여울마을 한강제방을 대상으로 호안공법에 따른 자연적인 식생유입 현황을 분석하여 생태적인 측면을 고려한 제방 호안 식생유도를 목적으로 수행하였다. 제방 호안공법별 식생 분포 특성을 분석한 결과 장대블록에는 귀화초본이 70.7%로 우점하였고 잔디블록에는 자생초본군락이 48.5%, 방틀블록은 자생초본군락 55.7%로 자생초 본군락 면적은 방틀블록에서 가장 넓었다. 제방 호안공법별 식생피도는 장대블록이 평균 27.9%로 가장 낮았고 잔디블록(평균 95.3%), 방틀블록(평균 97.5%)순으로 높았다. 식생기반면적에서는 장대블록이 가장 협소하였으며 방틀블록이 가장 넓었다. 식물군집구조에서 장대블록은 건조초본 및 덩굴성초본이 주로 우점하였고 식생피도도 낮았으며 잔디블록은 다양한 종이 소규모군락을 형성하였다. 방틀블록은 식생기반 면적이 가장 넓어 다년생 초본인 물억새, 큰김의털,미국쑥부쟁이 등이 넓은 면적의 군락을 형성하였다. 호안공법별 평균 건물중은 장대블록은 $6.75g/m^2$, 잔디블록은 $137.65g/m^2$, 방틀블록은 $187.63g/m^2$으로 방틀블록 식물 건물중이 가장 많았다. 토양특성에서 토양 수분함량은 방틀블록 16.3%, 잔디블록 15.2%인 반면 장대블록은 4.7%로 토양이 매우 건조하였다. 토양 이화학적 특성 분석결과 토성, 토양산도(pH), 치환성 양이온 함량은 호안공법별로 큰 차이가 없었으며 토양유기물 함량(OM)과 유효인산(Available $P_2O_5$)은 장대블록에서 가장 높은 수치를 보였다. 따라서 향후 하천제방 호안녹화의 경우 제방의 안전을 고려하여 가능한 식생기반 면적을 넓혀주어 자연적인 식생 유입이 가능하도록 제방 호안공법 적용이 필요하였다.

• 교육시설 논문지
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• 제18권4호
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• pp.25-32
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• 2011

This study was carried out to obtain basic data for architectural plans about factors on the facilities relocation needed in management of variation type. For this, floor plans of thirteen middle schools located in Korea and Japan were compared. The results showed a successful conversion to block system according to each subject after remodeling in the schools of our country, however, a monotonous spacial composition excluded other spaces such as media space, teachers' station and preparation room was also shown. These mentioned spaces were important factors in the investigated schools of Japan. By the results of the spacial composition about each space required to the management of variation type, a space share of supplemental areas for learning activities and movement, had shown comparatively low share before remodeling, was improved to 6% and 11.6%, respectively. However, the spacial share of two areas were 16.8% and 12.9%, respectively, in the schools of Japan and it meant the distribution of area was more even than the cases of our country.

• 한국수산과학회지
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• 제33권4호
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• pp.325-330
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• 2000

갈조류의 주성분인 alginate는 다양한 생리적 기능을 가지고 있으나, 고점성과 난용성으로 인하여 식품에의 광범위한 이용에 제한을 받고 있는 실정이다. Alginate가 가지고 있는 고유의 생리적 기능성을 유지 향상시키면서 점성을 줄이고 용해도를 높혀서 alginate의 이용성을 확대할 목적으로 가열에 의한 저분자화를 시도하였다. 즉, 평균분자량이 약 10,000 (HAG-10), 50,000 (HAG-50) 및 100,000 (HAG-100) 정도의 alginate를 제조하여 각 저분자 atginate의 물리${\cdot}$화학적 특성 변화를 검토하였다. 가열에 의한 점도와 평균분자량은 가열시간이 경과할수록 급격히 저하하였으며, 점도와 평균분자량사이에는 서로 밀접한 상관관계 ($r^2=0.955$)를 나타내었다. 가열에 의한 alginate의 block조성비 및 M/G 비율은 가열시간이 경과함에 따라 MM-block은 변화가 없었으나 GG-block은 급격히 저하하였다. 그리고, MG-block은 오히려 완만히 증가하였으며 M/G 비율은 급격히 증가하는 경향을 보였다. 분자량의 감소에 따른 alginate의 분자구조의 변화를 $FT-IR, ^1H-NMR$ 및 $^(13)C-NMR$로 측정한 결과, 가열에 의해 alginate가 저분자화되어도 분자구조의 특징적인 변화는 관찰할 수 없었다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제12권2호
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• pp.79-91
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• 2006

The purpose of this study is to suggest institutional reformation of public office facilities by analysis the status of services on welfare for the aged and disabled. For this study, we have researched and analyzed on two different aspects. The aspects are space composition of public office facilities, welfare systems and service support within region. And we can get the following important points as conclusion; (1) We need to consider on not only access for public office facilities site but also the connection on business such as block plan on zone and connection between quarters. Architectural plan has to be considered. (2) Most of the public office facilities use human service resources as a supporting system for shortage of convenient facilities. Variety of welfare services are required. (3) We need to secure various programs and space for local peculiarities and social demand.