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AE 를 이용한 콘크리트 구조물 진단 및 감시 방법의 개발
최기상,최기홍 한국산업안전학회 1999 한국안전학회지 Vol.14 No.3
The feasibility of using AE for monitoring mechanical failure in concrete structures has been tested. Specifically, the relationship between the fracture and the characteristics of AE signal is theoretically and experimentally investigated. The experimental results manifest that the high sensitivity of AE signal to the fracture of concrete structure makes it a good choice as sensor for monitoring concrete structure.
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어브레이시브 워터제트를 이용한 알루미나 세라믹스의 가공
최기상,최기흥,김정수 대한기계학회 1994 대한기계학회논문집 Vol.18 No.8
In this paper, a model of material removal in abrasive water jet machining of brittle material is developed, and experimentally evaluated. Abrasive water jet machining proved to yield better material removal rate than other machining techniques for hard and brittle material (alumina ceramics). It was also found that large scale fracture may develop at the exit of the jet from the material. The fracture size was predicted as a function of water jet pressure and size of the hole. Finally, the feasibility of using acoustic emission signals for in-process monitoring of the abrasive water jet machining process is investigated.
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최기상,최기흥 대한기계학회 1995 대한기계학회논문집 Vol.19 No.7
The feasibility of using AE for detecting contact and slip between a workpiece and an end effector has been tested. Specifically, the relationship between the contact and slip motion and the characteristics of the AE signal is theoretically and experimentally investigated. The experimental results manifest that the high sensitivity of AE signal to the contact and slip makes it a good alternative as a robot tactile sensor.
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최기상,오종현,최기흥,Choi, Gi-Sang,Oh, Jong-Hyun,Choi, Gi-Heung 대한전자공학회 1999 電子工學會論文誌-T Vol.t36 No.4
본 논문에서는 조미동 구동기의 반복추종제어에 관하여 논의한다. 제안되는 시스템은 조동구동기로 선형 자기드라이브를, 미동구동기로 선형 압전구동기를 사용하여 구성된다. 특히, 선형 자기드라이브에 내재된 비선형 마찰과 선형 압전구동기의 이력현상이 먼저 모델링되고 되먹임선형화 루프가 이들을 추종제어에 사용한다. 주기적인 입력신호를 추종하는 경우 이를 더욱 확장하려 반복제어 알고리즘을 포함하도록 제어기를 설계한다. 즉, 반복제어기는 되먹임선형화가 적용된 PID 제어기에 설치된다. 실험결과에 의하면 정현파 입력을 추종하는 경우 PID 제어기에 되먹임선형화와 반복제어기를 함께 적용함으로써 추종성능을 크게 향상시킬 수 있는 것으로 나타났다. This paper discusses the repetitive tracking control method for a coarse-fine actuator. The proposed system is composed of a magnetic linear drive as a coarse actuator and a piezoelectric linear positioner as a fine actuator. In particular, nonlinear friction in a magnetic linear drive and hysteresis characteristic of a piezoelectric linear positioner are modeled first. The feedback linearization loop uses these models in tracking position control. The control strategy is then further extended to include a repetitive control algorithm in tracking periodic reference inputs. This repetitive controller is implemented on the existing PID controller augmented with feedback linearization loop. The experimental results show that performance in tracking sinusoidal waveforms is noticeably improved by augmenting a PID controller with feedback linearization loop and a repetitive controller together.
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최기상,Choi, Gi-Sang 한국음향학회 2008 韓國音響學會誌 Vol.27 No.8
바이올린, 비올라, 첼로, 콘트라베이스 등 비올족 현악기는 현의 진동이 브리지를 통해 몸체로 전달되고 공명을 일으켜 큰 소리를 내게 되어 있다. 즉 현악기에서는 현의 진동이 음원이 되며 현의 재질, 구조와 경계조건이 음색에 결정적 영향을 미치게 된다. 본 연구에서는 첼로에서 한쪽 끝은 고정되고 다른 끝은 손가락에 의해 운지된 현의 진동을 양 끝이 고정된 개방현의 진동과 비교하여 해석하고 실험하였다. 해석과 실험의 결과는 운지된 현의 진동이 양단이 고정된 개방현의 진동과 크게 다른 것을 보여준다. 또 운지된 현에서 손가락 끝과 현의 접촉 조건에 의해서도 음색이 크게 달라지므로 접촉조건을 조절함으로써 악기의 음색을 바꿀 수 있음을 설명해 준다. In viol family string instruments vibration of string is transmitted to the front plate through bridge to cause resonance of the instrument body. Therefore, the vibration of string is the source of sound and the properties, the structure, and the boundary conditions of string are expected to have significant effect on the sound. In this study the vibration of strings in cello when one end is fixed and the other end is pressed with finger tip is studied and compared with the case of the fixed-fixed ends. The result of analysis and experiment shows that the vibration of the string that is fixed at one end and pressed with finger tip at the other end is significantly influenced by the contact condition of the string with the finger tip and also quite different from that of the fixed-fixed string, It also suggests that the sound of a cello can be significantly influenced by the contact condition between the string and the finger tip in the fingered string.
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고등학교 장애학생 진로·직업 교육 내실화를 위한 지표 개발
최기상,김진철,박혜영,박희찬,이효자,황윤의 국립특수교육원 2010 특수교육연구 Vol.18 No.1
This research focuses on the present condition of vocational education and preparing careers in establishments in special high schools which are setting in secondary education class in special education school, special education classroom in general education high school or inclusive high school. The method of this research was to analyze the literature analysis on literature reviews on career, vocational education, career rehabilitation education, general education and special education for students with disabilities. Using the content and the results the researchers used precedent research to implement ule literature analysis; they developed a rough draft of directions. Then the rough draft was investigated with Delphi Technique for 3 times with 32 specialists of career, vocational education, and special education staff. The direction was completed through the research committee after a total of 10 times The indicators developed were composed of three parts: Input, process, and output of career and vocational education for high school students with disabilities. The input indicators were focused on present conditions and matters for career and vocational education, such as perceptions, system, equipments, budget, etc. The process indicators were focused teaching-learning for career and vocational education, such as individualized education program, managing the curriculum, connection between society and region, job preparation, man power and vocational education. The output indicators were focused results for career and vocational education, such as percentage of employment, entering college or university, vocational training for career, achievement of educational goal, etc. This research was developed based on the direction of the curriculum emphasis and present conditions for future career and vocational education with school sites, institutions, and companies. The direction is to know the present condition along with the school and the companies to prepare the curriculum and necessary equipment for the students from now on. Henceforth, an adequate verification will complete the direction through an investigation for research of field suitability.
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