• Journal of the Computational Structural Engineering Institute of Korea
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• v.28 no.5
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• pp.511-521
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• 2015

The thermal bridge occurring in a building influences its thermal performance and durability. The domestic typical multi-unit residential buildings suffer thermal losses resulting from thermal bridges of the balcony slab. To minimize the thermal loss between inside and outside of the balcony slab, thermal bridge breaker(TBB) systems have been developed and applied in building construction. Although thermal bridge breaker systems for reinforced concrete(RC) wall-slab joints can improve the thermal performance of a building, it is necessary to verify the structural performance of TBB systems whether they provide proper resistance for cyclic loading. In order to investigate the structural characteristics of TBB systems embedded in RC slabs, cyclic tests of wall-slab joints were performed by applying two reversed cycles at each up to 30 cycles. The test results show that the RC slabs embedding TBBS systems can present excellent structural performance and the maximum moment capacity, energy dissipation capacity and ductility of TBBs systems are enhanced compared to those of the typical RC slabs.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.11a
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• pp.105-107
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• 2013

단일 반송파 시스템은 다중경로를 가지는 무선채널을 통과할 때 심볼 간 간섭(Inter-symbol Interference, ISI)에 의한 영향을 크게 받으며 이를 보상하기 위한 등화방식은 그동안 많이 연구되어왔다. 본 논문에서는 단일 반송파 시스템에서 심볼 간 간섭의 영향을 보상하기 위해서 잡음 예측기와 결합된 이중 피드백 구조의 등화 방식을 제안한다. 또한, 제안된 등화 방식이 기존 반복 결정 궤환 등화기에 비해 향상된 성능을 가지는 것을 이론적 분석과 모의실험을 통해서 분석한다.

• Journal of the Korea Institute of Information Security & Cryptology
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• v.8 no.3
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• pp.79-94
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• 1998

본 논문에서는 컴퓨터 시스템에서 정보보호를 위해 가장 많이 사용하고 있는 DES(Data Encryption Standard)암호알고리즘을 시스템 설계 기술언어인 VHDL(Vhsic Hardware Description Language)로 설계하고 이것을 칩으로 합성하여 하드웨어에서 차지하는 면적과 속도를 비교 분석하였다. 설계방법에 있어서는 구현하는 방법에 따라 전 라운드 구현형, S-box 공유형 그리고 단일 라운드 반복형 범용성을 갖도록 하여 FPGA로 구현한다. 본 논문에서 구현한 단일 라운드 반복형 설계는 Synopsys의 EDA 툴을 이용하여 시뮬레이션 및 합성을 하였고, Xilinx사의 xdm을 이용하여 XC4052XL 칩에 구현하였다. 그 결과 입력 클록 50MHz상에서 100Mbps의 암,복호화 속도를 갖는 범용성 암호칩을 설계 및 구현한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.399-401
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• 2013

In this paper, we present the method to impove the performance by using iterative decoding in LDPC codes with 8-PSK modulation. Iterative decoding is the technique that improve the performance after the input signals of receiver are re-calculated by using the soft decision output of decoder. DVB-S2 system with 8-PSK modulation based on iterative decoding had a better performance than DVB-S2 with 8-PSK modulation over Gaussian channels.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.1
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• pp.95-101
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• 2007

Recently, two phase scheme for removing impulse noise in images is proposed. This algorithms first detect the noise candidates based on the adaptive median filter, and then apply optimizing techniques recursively only to those noise candidates to restore image. Thus the noise detector with high accuracy is important role on this algorithm, In this paper, novel noise detector is proposed, which can detect impose noise with high accuracy while reducing the probability of false detecting image details as impulses. And the method for reducing computational cost of regularization phase is presented also.

• Monthly Duck's Village
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• s.199
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• pp.18-25
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• 2020

2010년부터 거의 해마다 반복적으로 발생한 고병원성 AI(조류인플루엔자)로 가장 큰 피해를 입은 산업은 무엇일까? 2011년 생산액 1조4,000억원을 기록한 오리산업은 반복된 AI로 상승세를 타던 오리 프랜차이즈 업체들이 줄지어 문을 닫으면서 꺾이기 시작했다. 2017년 오리 생산액은 8,700억원으로 단 6년만에 40%가 급감했다. 꺾인 오리산업 만큼 소비자들의 인식도 반감됐다. AI의 주범인양 낙인찍힌 오리산업은 급기야 2017년 평창 동계올림픽을 대비해 시범적으로 실시했던 겨울철 오리농가 사육제한 사업이 올겨울 3번째 시행되면서 정례화 되가는 모양새다.

• Journal of Internet of Things and Convergence
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• v.9 no.3
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• pp.81-86
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• 2023

SSD (solid state disk), which is flash memory-based storage device, has the advantages of high density and fast data processing. Therefore, it is being utilized as a storage device for high-capacity data storage systems that manage rapidly increasing big data. However, flash memory, a storage media, has a physical limitation that when the write/erase operation is repeated more than a certain number of times, the cells are worn out and can no longer be used. In this paper, we propose a method for converting defective multi-bit cells into single-bit cells to reduce the defect rate of flash memory and extend its lifetime. The proposed idea distinguishes the defects and treatment methods of multi-bit cells and single-bit cells, which have different physical characteristics but are treated as the same defect, and converts the expected defective multi-bit cells into single-bit cells to improve the defect rate and extend the overall lifetime. Finally, we demonstrate the effectiveness of our proposed idea by measuring the increased lifetime of SSD through simulations.

• Korean Journal of Logic
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• v.9 no.1
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• pp.31-62
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• 2006

이 논문은 포퍼의 후기 확률론인 성향적 확률론에 대한 것이다. 포퍼가 확률에 관한 성향이론을 제시한 가장 중요한 동기는 단일 사건에 확률값을 부여하기 위함이었다. 그의 성향이론은 전기와 후기로 나누어지는데, 전기의 이론은 성향을 반복가능한 조건들의 집합으로, 후기의 이론은 성향을 특정 시각에서의 우주의 상태로 설명한다. 이 글은 포퍼의 전기와 후기 성향이론이 성공적이지 않음을 논증한다. 전기 성향이론에 대해서는 가장 좁은 준거집합의 원리의 문제에 부딪혀서 단일 사건에 대하여 객관적인 확률값을 부여할 수 없기 때문이고, 후기 성향이론은 성향을 약한 인과라고 해석하는 문제와 함께 포퍼 자신의 의도와 달리 형이상학적인 이론이 되어버렸기 때문이다.

• Journal of the Korean Geotechnical Society
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• v.32 no.12
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• pp.23-32
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• 2016

A single particle crushing test was carried out for recycled aggregates from waste concrete while demolishing various structures. When the recycled aggregates were used for backfill or road subbase materials, load-displacement and crushing characteristics were analyzed. The recycled aggregates with hydrates and aggregates were sorted into 40 mm size (75-40 mm) and 20 mm size (40-20 mm). At initial loading, their irregular surface was closed to and then crushed by loading plate. Such first crushing stage was called 'Surface crushing'. Further loading, some hydrate was crushed and detached from aggregate, and such process repeated several times. This state is called 'hydrate crushing'. The final state is called 'aggregate crushing' in which aggregate crushed and following load suddenly dropped down. As the load increased, such crushing cycle is repeated several times. The shapes of aggregates are round or square, and triangle or long shaped. Depending on their shapes and surface conditions, they crushed in different ways. The 63% of aggregates showed more than 50% load reduction due to aggregate crushing. The 90% load reduction occurred at 15% of aggregates. The 40 mm aggregate crushed at maximum load between 3.05-4.38 kN and 70% of crushed aggregates were less than 20 mm.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.10
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• pp.949-957
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• 2017

A laser-vision-based height measurement system is developed and implemented for the inspection of two-step variable valve lift module assemblies. The proposed laser-vision sensor module is designed based on the principle of laser triangulation. This paper summarizes the work on 3D point cloud data collection and height difference measurements. The configuration of the measurement system and the proposed height measurement algorithm are described and analyzed in detail. Additional measurement experiments on the height differences of valves and lash adjusters of a two-step variable valve lift module were implemented repeatedly to evaluate the accuracy and repeatability of the proposed measurement system. Experimental results show that the proposed laser-vision-based height measurement system achieves high accuracy, repeatability, and stabilization for the inspection of two-step variable valve lift module assemblies.