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나종윤,장용훈,박형배 한국기계기술학회 2007 한국기계기술학회지 Vol.9 No.3
Recently, there are many researches that are performed for increasing reliability about product life cycle using ALT(Accelerated Life Test), AST(Accelerated Stress Test) and ASA(Accelerated Stress Audit) in the industry. The test of this research needs a device that has wide-band frequency vibration. But most test devices such as HALT only show the good response of high frequency area. In this research, the platform of ALT was developed based on Stewart Platform using pneumatic Actuators. Pneumatic Actuators represent response of wide-band frequency by motion and mpact. Cylinders of Stewart Platform is operated based on frequency and pressure. This research shows system characteristic of Platform to develop the control algorithm of accelerated life test platform in future research.
ENUM DNS 기반의 BcN 번호이동 시스템 구현에 관한 연구
나종윤(JongYun Ra),송관호(KwanHo Song) 한국정보과학회 2007 한국정보과학회 학술발표논문집 Vol.34 No.1D
번호이동성은 이용자가 사업자, 위치, 서비스 등을 변경하더라도 기존에 사용하던 전화번호를 그대로 사용할 수 있도록 하는 제도로써 통신 산업의 경쟁을 활성화하고 이용자의 편익을 증진시키기 위해 도입되었다. 현재는 시내전화 내 또는 이동전화 내에서와 같이 단일 역무 내에서만 번호이동성이 시행되고 있지만, 광대역통합망(BcN)과 같은 IP기반의 컨버전스 네트워크 상의 번호이동성에서는 URI 기반 라우팅, 이종 역무간 번호이동과 같은 고려사항이 발생하게 된다. 본 고에서는 BcN 상의 번호이동 시스템을 구현하기 위한 ENUM DNS 활용방안을 제시하고자 한다.
초음파법에 의한 콘크리트 구조물의 안전성 측정에 관한 연구
하재담,나종윤,이승규,김창은 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.1
Ultrasonic test usually was used for defect detection, crack depth measurements and strength estimation of hardened concrete. The essence of the pulse velocity method is that the transition time of an ultrasonic longitudinal pulse is measured in concrete. Ultrasonic velocity was propagated to the age of concrete, made a radical change at that time when concrete was setted. This study which monitored the change in a concrete by ultrasonic test was performed to estimate initial setting and final setting.
하재담,나종윤,이승규,김창은 연세대학교 산업기술연구소 1998 논문집 Vol.30 No.2
Recently, high quality architectural concrete, i.e., appearance of natural stone and a marbling effect, is needed. to achieve high quality glassy reflective surface for outer wall of the building. In this study to achieve above characteristics of the "glossing exposure concrete" we developed a form practice and the best mix proportion and derived the optimistic removal time of form to bring out the durable glassy reflective surface and durable concrete. Hereby with the "glossing exposure concrete" obtained we applicate for first time, to Electronics and Telecommunications Research Institute situated on Taedok Science Town and it will be the beginning of the construction of "glossing exposure concrete" in this country.
하재담,나종윤,이승규,김창은 연세대학교 산업기술연구소 1998 논문집 Vol.30 No.2
Recently, it had been increased to construct massive concrete structures, like under-ground structure, offshore structure etc., ie. concrete construction have became larger and higher and are demanding lower heat concrete to prevent thermal cracking. It has been progressed to replace cements with fly-ash and slag to lower heat of hydration, but it is hard to control quality of the mineral admixtures in stage of adjusting of real construction. Application of low heat Portland(Belite Rich) cement for the mass concrete is the best solution to satisfied those requirements. Here are explained the basic properties of fresh concrete as well as hardened concrete of using low heat portland cement(LHPC). Also, we compare the results of adiabatic temperature rise test using LHPC and OPC.
콘크리트 구조물의 안정성에 미치는 국내 플라이애쉬의 특성에 관한 연구
김창은,하재담,나종윤,이승규 연세대학교 산업기술연구소 1999 논문집 Vol.31 No.1
Fly ash is glassy dust collected from coal fired power plant. Recently, lots of researches for fly ash have been conducted in Korea and fly ash is a valuable material especially when it is used in high strength, high flowable, high durable concrete. But it is varied with coal source of power station, coal grinding and boiler conditions. Therefore quality control of fly ash itself to get high quality concrete is important. In this study, over 20 samples of Poryong and Samchonpo fly ashes are tested and analyzed. The physical and chemical properties of fly ash and their relationships are investigated and it can be applied to quality control of concrete.