• Journal of the Institute of Convergence Signal Processing
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• v.6 no.1
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• pp.8-14
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• 2005

The implementation of vision system using CCD camera which measures the earing rate of aluminium CAN is represented in this paper. In order to optimize the input image, the object of the input image is separated and the position of the image is calibrated. In the preprocessing, the definition of image is improved by the histogram equalization, and then the edges of the input image are detected by the Robert mask. The heights of the four ears and angles of the aluminium CAN are measured manually with the digital vernier calipers in industry. It takes 30 seconds to measure manually the height of one direction of the aluminium CAN at least three times. However, when the proposed system in this paper is applied, it takes 0.02 seconds only. In conclusion, the efficiency of the proposed system is higher than that of the system used in the industry.

• Journal of the Korean Institute of Gas
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• v.24 no.4
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• pp.48-55
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• 2020

The installation of lightning protection system has recently been increasing, but the amount of damage has still been increasing. In this study, survey (interview) and field conditions were conducted to identify the installation and safety standards of the lightning protection system. it was analyzed that the safety management system is non-existent at the stage of the design, manufacturing and construction of the site lightning protection system, and that the safety inspection of the lightning protection facility is not properly managed. It has been shown that lightning protection systems, that can solve these problems, need to be re-established according to the reality so that safety inspection can be carried out in accordance with safety standards such as management of safety certification products, operation of survey institutions, design, manufacturing, and construction of safety standards at a national level.

• Proceedings of the Korea Water Resources Association Conference
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• 2012.05a
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• pp.668-668
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• 2012

제방 비탈면 보호방법 중에서 식생매트를 사용하는 방법은 제방의 보호와 함께 자연친화적이면서 생태계의 보전 측면에서 유리하고 이와 아울러 심미적 효과와 비용의 적절성 등의 요건을 만족하기 때문에 최근 국내 자연형 하천정비에서는 다양한 종류의 식생매트들이 빈번히 사용되고 있다. 하지만 식생매트로 인한 제방의 비탈면 보호 효과에 대해서는 아직까지 정성적으로 분석된 예가 미흡하여 이에 관한 연구가 시급히 요구되고 있는 실정이다. 비탈면을 보호하는 비탈덮기는 생태계와 경관 등의 고려도 중요하지만 그보다 먼저 유수에 의한 파괴가 발생하지 않아야 한다. 따라서 제방의 비탈면 보호 효과가 다른 재료에 비해 상대적으로 취약할 수 밖에 없는 식생매트의 경우 적용범위와 한계를 명확히 하여야 잘못된 적용으로 인한 재해를 막을수 있을 것이다. 근래 들어 지역을 가리지 않는 국지성 폭우로 인한 홍수가 점차로 확대되고 있는 국내 상황을 고려할 때에도 식생매트의 한계와 적용범위의 결정은 매우 중요하다. 본 연구에서는 한국건설기술연구원 안동 하천실험센터 호안블록 시험구간에서 하류 10m 지점에서 시작하는 20m 구간에 두 종류의 식생매트를 교대로 설치하여 각각의 식생매트에 관한 파괴실험을 수행하였다. 두 종류의 식생매트 모두 코코넛 섬유를 원료로 사용하는 제품이며, 식생매트의 파괴 실험은 식생활착 이전의 상황을 재현하여 수행하였다. 이는 통상적으로 식생 활착 이전의 식생매트가 제방 비탈면을 보호하는 효과가 현저히 떨어지는 단점을 가지고 있기 때문에 이에 맞추어 본 실험에서는 식생매트의 자체의 단점과 한계를 파악하는 것을 목적으로 하였다. 실험 결과 두 종류의 식생매트는 모두 침수시 부력으로 인한 부유 현상과 식생매트 틈세 흐름으로 인한 기반층의 세굴 현상을 발견할 수 있었으며, 이러한 상황에서 식생매트를 고정하는 앵커가 매우 중요한 역할을 한다는 것을 발견할 수 있었다. 식생매트가 기반 토층에서 분리되어 파괴가 발생하는 유량조건은 각각 식생매트에 따라 서로 다르게 나타났는데, 이 또한 매트를 고정하는 앵커의 특성 때문인 것으로 판단된다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.8
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• pp.3358-3365
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• 2012

This paper presents a scheduling scheme for die casting processes considering power usage. The scheduling problem of a shift-based die casting process is represented by a linear programming (LP) model that maximizes the average efficiency of melting furnaces in regard of the usage of molten alloy, where the product quantities of each shift are used as primary variables. In this research, we propose a novel LP model that considers power usage of foundries. The developed LP model can derive product plans in which the expended power of a casting shift does not exceed a prescribed limit, while optimizing the efficiency of alloy usage. The simulation result of a case study demonstrates the superiority and applicability of the proposed scheme. This paper serves as a basic research on the role of foundries as an intelligent costumer in smart grid environment where the limit of power usage should be fulfilled.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.1019-1022
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• 2015

사회적 약자인 청각장애인들의 수화통역 서비스가 대체로 만족스럽게 제공되고 있지 않다. 또한 청각 장애인수 대비 수화통역가의 부족과 일반인과의 즉각적인 소통이 어려워 일상생활에 불편함을 느끼는 청각장애인들이 많다. 이의 문제점을 착안하여 본 연구에서는 청각장애인들이 휴대할 수 있는 수화 통역기를 개발하고자 한다. 청각장애인들의 손동작을 인식할 수 있는 3D센서 립모션(Leap-Motion)을 통해 수화를 인식한다. 립모션 센서와 안드로이드 스마트폰 및 태블릿과 연결하여 손 데이터 값을 분석했다. 분석한 손 데이터 값과 특정 지화(자음, 모음)와 간단한 인사말의 수화동작을 취할 때, 트래킹되는 데이터 값을 비교하여 수화를 인식하고 수화와 인식된 지화의 자음과 모음을 글자로 완성시켜, 텍스트와 음성으로 출력한다. 또한 립모션이 부착된 하드케이스 안에 스마트기기 탈착이 가능한 실용성 있는 수화통역기 제품 개발에 대한 연구를 목표로 하고 있다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.8
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• pp.1415-1423
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• 2007

Total efficiency of transmitter system was improved by developing combinational 2-Way Isohybrid for GSM1900 base station in this paper. The size of product was decreased and the characteristics were stabilized. The isohybrid transmitter combiner of chip coupler type and hybrid coupler type were designed and fabricated. Insertion loss for chip coupler type isohybrid was $3.17\;dB{\sim}3.47\;dB$. On the other hand, insertion loss for hybrid coupler type was $3.17\;dB{\sim}3.42\;dB$. Isolations between ANT and port were $24.23\;dB{\sim}29.98\;dB$ in case of chip coupler type Isohybrid and were $26.28\;dB{\sim}36.91\;dB$ in case of hybrid coupler type, respectively.

• Korean Journal of Optics and Photonics
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• v.25 no.2
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• pp.78-84
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• 2014

In this paper secondary optics for an LED lamp with a narrow beam angle of $15^{\circ}$ were optimized by using a two-reflector system, to reduce both its size and the occurrence of satellite rings. The conic constant and the curvature of the primary reflector were determined by considering the relation of the source size to the beam angle, and the optimal position and radius of the secondary reflector were found for reducing the occurrence of satellite rings. Luminous flux efficiency was about 80%.

• Journal of Sericultural and Entomological Science
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• v.45 no.2
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• pp.85-89
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• 2003

This study was carried out in order to investigate the sensory characteristics and nutritional analysis of sherbet ice-cream and ice-bar with mulberry fruits. In the sensory characteristics, sherbet ice-cream and ice-bar with 2％ mulberry fruit extracts were revealed to have highest level on overall quality, color, texture, taste, and flavor. Content of crude protein, crude fat and crude ash were observed in higher level in 3％ mulberry fruit extracts than others. In mineral analysis, Ca and K content were the highest in sherbet ice-cream and ice-bar with mulberry fruits. Also Mg, Na, Fe and Zn content were higher level in 3％ mulberry fruit extracts than others.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.650-657
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• 2021

Alkali activators that stimulate mineral compounds are expensive materials, but in order to replace industrial products of high alkali in gredien ts, both product an d econ omic feasibility must be satisfied. In this study, alkali in dustrial waste(LW) from the LCD man ufacturin g process were used for the purpose of alkali active reaction of GGBFS for high stren gth concrete over 50MPa. Concrete mixed with LW had reduced workability, but it had the characteristic of increasing compressive strength. Analysis using ACI 209 Compressive Strength Model Equation was made to compare the changes in strength coefficients according to LW mixing. The durability test of concrete, such as Chloride Penetration Resistance and carbonation resistance, also showed excellent performance. In the Adiabatic temperature rise test results, the concrete mixed with LW had the effect of accelerating the initial hydration heat. However, the final Adiabatic temperature rise was not significantly affected by the mixing of LW.

• Fire Science and Engineering
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• v.33 no.2
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• pp.79-84
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• 2019

The use of emergency escape breathing devices (EEBD) is strongly required to protect against toxic gas or flooding caused by ship fires or accidents. Recently developed domestic EEBD products only satisfy the basic performance requirements, but no wear fit and activity performance evaluation has been done for real usage. In this study, the global level test requirements for wear comfort and activity of EEBDs were developed and the open and closed type of domestic EEBD products were evaluated. Poor visibility, longer wear time, breathing resistance, and hose obstruction in an open type and canister obstruction, weight unbalance, and an invisible black breathing bag in the closed type EEBD were estimated to be the main problems that need to be improved.