• International Journal of Highway Engineering
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• v.13 no.1
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• pp.79-86
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• 2011

Recently, usage bicycle is encouraged to reduce fuel consumption and air pollution. For this purpose, bike road constructions are actively performed. However, types of pavement used in bike roads have high construction cost and performance comparing the required capacity of bike roads. Thus, an economical pavement type for construction is necessary for the effective development. Roller compacted concrete pavement have good requirements, such as easy construction and low costs, high structural performance of hydration and internal communication aggregation on compaction for bicycle roads. However, the pool landscape surface and resistance to deicer damage cannot be applied to the construction of bicycle roads. Thus, for solving this problem used coating which may have effect of improving the landscape and environmental resistance. To examine this effect were evaluated performance of roller compacted concrete pavement on the coating.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2012.05a
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• pp.431-432
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• 2012

• 한국도로학회:학술대회논문집
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• 2010.03a
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• pp.99-106
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• 2010

• International Journal of Highway Engineering
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• v.12 no.3
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• pp.103-111
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• 2010

Recently, usage bicycle has been encouraged to reduce energy consumption and $CO_2$. For this purpose, lots of bike road construction are planned. Typical type of pavement used in bikeroad such as asphalt concrete pavement, portland cement concrete pavement, colored pavement, soil pavement. However, these pavement types may need high construction cost comparing the required capacity of bike road. In this study, roller compacted concrete pavement which are economical and durable, are investigated to use as bike road pavement. The optimum compaction level and mix design of roller compacted concrete pavement are suggested by exploring strength test with various mixture ratio and compaction level, Also durability was examined based on freeze-thaw and scaling test. In addition, the cost and amount of carbon emission during in the construction of roller compacted concrete were evaluated and compare with the cost and carbon emission of typical portland cement concrete.

• Journal of Platform Technology
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• v.8 no.2
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• pp.22-31
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• 2020

The construction and operation of industrial automation has been actively taking place from manufacturing plan to production for improving operational efficiency of production line and flexibility of equipment. ISO/TC184 is standardizing on operating methods that can share information of programmable device controllers such as PLC and IoT that are geographically distributed in the production line. In this study, the design of the cell controller consists of PLC group and IoT group that perform signals such as temperature sensors, gas sensors, and pressure sensors for thermal processes and corresponding motors or valves. The operation and analysis of the cell controller were performed using SDN(Software Defined Network) and the three types of process services performed in thermal processes are real-time transmission service, loss-sensitive large-capacity transmission service, and normal transmission service. The simulation result showed that the average loss rate improved by about 17% when the traffic increased before and after the application of the SDN route technique, and the delay in the real-time service was as low as 1 ms.

• Proceedings of the Korean Information Science Society Conference
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• 2002.04a
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• pp.583-585
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• 2002

Mobile Ad Hoc Network에서는 무선으로 연결된 호스트들이 쉽게 이동할 수 있으며 미리 설치된 유선망을 이용하는 셀롤러망과 달리 이동 호스트 사이의 통신만으로 이루어진 망이다. Mobile Ad Hoc Network에서는 각각의 노드들의 이동성이 높기 때문에 이 각각의 노드들의 라우팅 경로를 결정하는 것이 중요하다. 이에 따라 Mobile Ad Hoc Network를 위한 많은 라우팅 프로토콜이 제안되었다. 본 논문에서는 기존에 제안된 Cluster Based Routing Protocol(CBRP)극 변형하여 마치 셀롤러망에서의 셀과 같이 고정된 위치를 하나의 셀로 정의하고 그 하나의 셀이 클러스터를 형성하여 라우팅 오버 헤드를 줄일 수 있는 기법을 제안한다.

• KOREAN POULTRY JOURNAL
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• v.49 no.8
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• pp.130-134
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• 2017

현대 사회는 영원한 도전의 시대이다. 소비자들이 원하는 바람은 끝이 없으며, 여기에 충족해 줄 수 있는 기업들만이 살아남을 수 있는 시대가 도래하였다. 양계산업도 이제는 첨단 ICT(융복합기술)사업이 활발히 진행되면서 과학적인 양계경영이 경쟁력에서 앞설 수 있는 무기가 되고 있다. 독창적이고 획기적인 연구개발로 모든 축산농가가 안심하고 쓸 수 있는 제품을 만들고자 뛰어든 업체가 있다. 서울시 금천구에 위치한 태진테크(대표 김승균)는 콘트롤, 보온등, 온도경보기, 무선온도경보기 등을 개발, 제조하여 농가에 보급하고 있는 콘트롤러 전문회사이다.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.1113-1115
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• 2013

NC 포스트프로세서는 CAD/CAM시스템에서 생성된 공구경로데이터 파일을 입력받아 NC공작기계를 구동시킬 수 있는 공작기계 제어데이터 파일로 변환해 주는 소프트웨어이다. 본 논문에서는 범용 NC 포스트프로세서를 웹에서 실행될 수 있도록 구현한 내용을 기술하고 있다. 사용자가 웹에 접속하여 NC 콘트롤러의 사양 및 매개변수를 설정해주면 절단에 사용할 NC파일이 자동 생성된다. 개발된 본 시스템을 사용하면 고가의 전용 NC 포스트포로세서 구입에 소요되는 비용을 줄일 있어 생산성 향상에 기여할 수 있다.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.9
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• pp.186-191
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• 2001

Spinning process is a chipless metal forming method for axi-symmetric parts, which is more economical, efficient and versatile method for producing parts than the other sheet metal forming process such as stamping or deep drawing. In this study, a fundamental experiment was conducted to improve productivity with process parameters such as tool path, angle of roller holder($\alpha$), feed rate($\gamma$) and corner radius of forming roller(Rr). These factors were selected as variables in the experiment because they were most likely expected to hale an effect on spring back. The empirical results were analyzed to know how much spring back was affected by these factors. And also thickness and diameter distribution of a multistage cup obtained by spinning process were observed and compared with those of a commercial product produced by conventional deep drawing.

• Tribology and Lubricants
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• v.35 no.4
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• pp.237-243
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• 2019

Through this study, we investigate the effects of ultrasonic nanocrystal surface modification (UNSM) technology on the fatigue life of needle roller bearings. The fatigue life of untreated and UNSM-treated needle roller bearings is evaluated using a roller fatigue tester at various contact stress levels under oil-lubricated conditions. We can ascertain that the fatigue life of an UNSM-treated needle roller bearing was extended by approximately 34.3% in comparison with an untreated one, where the effectiveness of UNSM technology diminishes with increasing contact stress. The surface roughness and surface hardness of needle roller bearings before and after being treated by UNSM technology are compared and discussed to understand the role of UNSM technology in improving the fatigue life of needle roller bearings. In addition, a fractograph of the damaged bearings is observed using a scanning electron microscopy to shed light on the fracture mechanisms of bearings under different contact stress levels. We can therefore conclude that the application of UNSM technology to the needle roller bearings improves the fatigue life by reducing the friction coefficient and increasing the wear resistance; this may be attributed to a reduction in surface roughness from 0.5 to $0.149{\mu}m$ and an increase in surface hardness from 58 to 62 HRc.