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A Development Methodology for Heterarchical Control of Flexible Manufacturing Systems
한영근 한국경영과학회 1995 한국경영과학회 학술대회논문집 Vol.- No.1(2)
This paper presents a methodology for development of a heterarchical control system in Flexible Manufacturing Systems (FMS) environment. A Petri net based model is applied for development of control software. A real-time scheduling methodology for the heterarchical system is also developed and it is used as a software entity in the overall architecture. The partition of generic and specific modules in control software development is emphasized. The control system performs its control tasks in two stages; (1) generation of generic control code and distribution of them to each controller entity prior to system execution; (2) generation of specific control code according to job arrival and its process plan. The control software and the scheduling algorithm are evaluated by a simulation program.
한영근,조진형 대한안전경영과학회 2004 대한안전경영과학회지 Vol.6 No.1
In this research, OIL(Ontology Inference Layer), one of the ontology language, is applied for classifying product data systematically, defining concepts, and establishing relationship between concepts. By transforming steel product data into XML documentation and managing them, knowledge management based on the logical structure of documents is possible.
모바일 어플리케이션의 테스팅 자동화 기술 수준 및 사례 연구
한영근,이현노,박창환 대한안전경영과학회 2015 대한안전경영과학회지 Vol.17 No.1
According to the generalization of mobile device use in our life, the complexity and diversity of mobile applications are increased, and thus the importance of application test to find faults and errors quickly and easily before release grows. This paper reviews the current automatic testing methodologies for mobile device applications and their element technologies. Also, well-known commercial tools for automatic testing are surveyed and case studies of their recent industry applications in domestic and foreign countries are performed.
한영근,박강,강경식 대한안전경영과학회 2008 대한안전경영과학회 학술대회논문집 Vol.2008 No.04
전통적인 유리병 부식 공정에서는 공정 투입 전 유리병을 홀더에 장착하는 수작업으로 인해 작업자들의 노동강도가 매우 크고, 부식에 사용되는 불산의 증발로 인한 위험 요소가 매우 크게 나타나고 있다. 본 연구에서는 기존의 병부식 공정을 자동화해주는 로터리 방식 부식 장비와 병을 홀더플레이트에 자동으로 장입하고 부식 후에 탈거하는 메커니즘 개발하고 시제품을 제작하여 이의 성능과 효과를 평가하였다. 그 결과로 노동집약적인 병 장입작업을 자동화하여 힘든 장입작업을 하던 작업자의 노동강도를 덜어줄 수 있었고, 불산으로부터 작업자를 이격시켜서 잠재적인 산업재해를 예방하여 작업환경을 개선하였다.
한영근 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.3
We experimentally investigate a simple tunable multiwavelength Raman fiber ring laser with temperature insensitivity based on a Sagnac filter fabricated with a polarization-maintaining photoniccrystal fiber (PM-PCF). The birefringence of a PM-PCF is not changed severely by external temperature variations because a PM-PCF is composed of a single material such as silica and a periodic structure of air holes. Consequently, a temperature-insensitive multiwavelength Raman fiber laser (−0.3 pm/C) can be realized by using a PM-PCF-based Sagnac filter incorporating a Raman gain medium. Stable operation of a multiwavelength Raman fiber laser with a wavelength spacing of 0.8 nm can be achieved because of the medium with an inhomogeneous Raman gain. The peak power fluctuation is measured to be less than 0.6 dB. The high extinction ratio is measured to be more than 40 dB. The peak wavelength position can be effectively controlled by using the rotation angle of the quarter-wave plate. All of channels are shifted by 0.4 nm as the rotation angle is changed from 0 to 90. We experimentally investigate a simple tunable multiwavelength Raman fiber ring laser with temperature insensitivity based on a Sagnac filter fabricated with a polarization-maintaining photoniccrystal fiber (PM-PCF). The birefringence of a PM-PCF is not changed severely by external temperature variations because a PM-PCF is composed of a single material such as silica and a periodic structure of air holes. Consequently, a temperature-insensitive multiwavelength Raman fiber laser (−0.3 pm/C) can be realized by using a PM-PCF-based Sagnac filter incorporating a Raman gain medium. Stable operation of a multiwavelength Raman fiber laser with a wavelength spacing of 0.8 nm can be achieved because of the medium with an inhomogeneous Raman gain. The peak power fluctuation is measured to be less than 0.6 dB. The high extinction ratio is measured to be more than 40 dB. The peak wavelength position can be effectively controlled by using the rotation angle of the quarter-wave plate. All of channels are shifted by 0.4 nm as the rotation angle is changed from 0 to 90.
한영근,김현주,Oh-Jang Kwon 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.4
The influence of surface roughness on the sensitivity of D-shaped fibers to changes in the ambient index was investigated. In order to obtain D-shaped fibers with different surface roughness, we polished one side of the fibers by using different abrasive grits. The topographies of the surfaces of the polished D-shaped fibers were then observed by using atomic force microscopy (AFM). The light scattered from the rough surfaces of the D-shaped fibers was measured by using optical microscopy. The effect of an ambient index change on the transmission characteristics of D-shaped fibers was measured for various values of the surface roughness. The experimental results indicate that variations in the surface roughness have a considerable influence on the sensitivity of the transmission characteristics of D-shaped fibers to changes in the ambient index.