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강동배,박창현,정우식,이귀옥,이화운,Kang, Dongbae,Park, Changhyoun,Jung, Woo-Sik,Lee, KwiOk,Lee, Hwa Woon 한국환경과학회 2020 한국환경과학회지 Vol.29 No.7
It is well known that atmospheric environments, including both meteorology and air quality, significantly affect public health, such as chronic lung disease and cancer, and respiratory infections. In this study, we have analyzed correlations between the number of daily respiratory outpatients and the atmospheric environments data for about ten years for the city of Busan, South Korea. The respiratory problem patients data have been categorized into two health-vulnerable groups by age over 65(DayPA_O65) and under 20(DayPA_U20), each of which shows relatively higher correlations with air quality and meteorology, respectively. However, time series analysis with factor separation results in that DayPA_O65 and DayPA_U20 show a higher relation with variance components and daily irregular factors of atmospheric concentrations, respectively.
Experimental Cutting Performance Evaluation of LGP using Vibration Assisted High Speed Shaping
강동배(Kang, Dong-Bae),안중환(Ahn, Joong-Hwan),손성민(Son, Seong-Min) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.4
폴리메틸메타클릴레이트(PMMA)는 광 관련 부품제조에 있어 중요한 재료로 많이 사용되고 있다.특히 TV,모니터, 휴대폰 등에 쓰이고 있는 디스플레이의 도광판(LightGuidePanel)에 적용되고 있어 현재까지는 매우 큰 상업적인 수요가 있다.PMMA도광판의 가공은 일반적으로 고속밀링에 의해 이루어지는데 부품에 대한 높은 정밀도 요구특성에도 불구하고 가공표면의 굴곡,균열 등에 대한 불량이 적지 않게 발생하고 있다.이러한 문제점을 해결하기 위하여 PMMA진동을 부가하 는 고속선삭의 적용이 시도되었으며 절삭공구에 진동을 부가하기 위한 장치와 최적 조건이 조사되었다.도광판용 PMMA의 진동절삭은 일반적인 밀링가공법에 비해 절삭력의 현저한 감소,열변형영역의 축소 등을 유도하였다.가공면에 있어서는 가 공방법이 엔드 밀링에서 단인공구를 사용하는 선삭으로 변경되었음에도 불구하고 진동절삭법에 의해 가공표면의 균일성이 크게 향상되어 가공면의 표준편차 1.0~6.0㎛,평균거칠기 0.3㎛가 달성되었다. PMMA (Polymethyle-methacrylate) optical components have recently been increasingly used as one of the important part of the high precision equipments. This research presents comparatively the surface preparation of light incident plane, LIP (Light Incident Plane) of LGP (Light Guide Panel) by end milling, high speed shaping, and vibration assisted high speed shaping. From several experiments, the results show that the surface quality was improved in high speed shaping and the vibration assisted HSS show not only decreasing waviness and breakage also raising the straightness property. For applying high speed shaping and vibration assisted HSS, an additional tool post was developed and experimentally used.
Development of a PVDF sensor for detecting over-load and impact on large-scale mechanical structures
강동배(Kang, Dong-Bae),안중환(Ahn, Joong-Hwan),김강연(Kim, Gang-Yeon),손성민(Son, Seong-Min) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.11
오늘날 작업능률 및 운용효율의 향상을 위해 장비의 대형화 추세가 진행되고 있으나 이와 더불어 사고 발생 시에는 많은 인명 피해와 함께 크나큰 경제적인 손실을 초래하게 되어 대형장비의 안전성 문제에 대하여 많은 연구가 진행되고 있다. 대형구조물의 안전성 감시를 위해 외부의 부하에 따른 구조물의 변형은 스트레인게이지로, 순간적인 충격에 의한 진동은 가속도 센서를 이용한다. 본 연구에서는 고분자 압전 필름센서인 PVDF(PolyVinyliDene Fluoride)를 이용하여 구조물의 변형 에 대한 측정뿐만 아니라 충격에 대해서도 민감하게 반응하여 하나의 센서로 부하와 충격을 모두 검출하여 산업적 효율성과 실효성 향상을 도모하였다. 개발된 센서는 스트레인 게이지의 출력값에 대해 14% 이내의 오차를 나타내고 가속도 센서와는 충격에 대해 동일한 패턴의 충격신호를 나타내었다. An external overload or impact is an important factor affecting the safety of large-scale structures. The proposal of this paper is the development of a system for detecting overload and impulse using a single PVDF film sensor. In large-scale structures, the load causes the structure to be deformed and the impulse generates vibration on the structure. Generally, low frequency deformation or bending of a structure is measured with a strain gauge and the high frequency vibration is detected by an accelerometer. On the other hand, a single sensor that can detect both deformation and vibration has not been developed. In this study, the development of a detection system integrated with a polyvinylidene fluoride (PVDF) film sensor, amplifier, and software was attempted to monitor deformation and impact through a single sensor. The system was verified by the possibility of detecting overload and impulse, and the two filtered signals of the PVDF were compared with a conventional strain gauge and an accelerometer.
강동배(Dong Bae Kang),김화영(Hwa Young Kim),손성민(Seong Min Son),안중환(Jung Hwan Ahn) Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.7
Shoe with leather upper such as safety and golf shoe requires a roughing process where the upper is roughed for helping outsole to be cemented well. It is an important and basic process for production of leather shoe but is not automated yet. Thus, there are problems that the defect rate is high and the quality of roughed surface is not uniform. In order to solve such problems, the interest in automation of roughing process is being increased and this paper introduces CAM system for 5-axis automatic roughing machine as one part of automation of roughing process. The CAM system developed interpolates a B-spline curve using points measured from the Roughing Path Measurement System. The B-spline curve is used to generate the tool path and orientation data for a roughing tool which has not only stiffness but also flexibility to rough the inclined surface efficiently. For productivity, the upper of shoe is machined by side of the roughing tool and tool offset is applied to the roughing tool for machining of inclined surface. The generated NC code was applied to 5-axis polishing machine for the test. The upper of shoe was roughed well along the roughing path data from CAM and the roughed surface was proper for cementing of the outsole.
강동배(Kang, Dong-Bae),안중환(Ahn, Joong-Hwan),손성민(Son, Seong-Min) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.1
정렬 시스템(Alignment System)은 다축의 스테이지를 이용하여 신속하게 물체를 정렬오차 범위 내로 위치 결정시키는 역할을 한다. 본 연구에서는 병렬구조로 설계하여 두께가 얇고 높은 정밀도와 더불어 강성이 높은 XYθ 정렬 스테이지를 개발하였다. 개발된 박형 병렬구조 XYθ정렬 스테이지는 직각도, 반복정밀도, 진직도 등의 3가지 측 정항목에 대해 초정밀급을 달성하였으며 반복정밀도는 1 ㎛미만이다. 비전시스템 및 정렬알고리즘을 활용한 정렬성능 평가에서는 정렬오차 ± 6.25㎛를 달성하였다. Alignment systems with multi-axis motions are applied to determine vertical arrangement of multilayer assembly such as LCD, PDP, and MLCC. This study reports the development of XYθ alignment stage which is designed as thin-type structure and parallel actuations. The thin-type parallel XYθ alignment stage is maintained below 1 ㎛ in repeatability error. The squareness and straightness also allow precise motion for the alignment by the developed stage. The measured error is ± 6.25㎛ in the alignment experiment by the vision system on the parallel XYθ alignment stage.
강동배(D. B. Kang),손성민(S. M. Son),안중환(J. H. Ahn) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
A workpiece with a large surface area is likely to be uneven due to form error and waviness. These geometric disturbances can cause inaccurate micro shapes to be formed when micro features are micro-grooved into the surface and cause the resulting workpiece to fail to function as desired. Thus, real-time measurement and compensation is required to guarantee the form accuracy of micro features while machining a workpiece with a large surface area. In this study, a method is suggested for real-time measurement of geometric error for the micro grooving of a large flat surface using a laser displacement sensor. The measurements are demonstrated for the workpieces with large surface areas and the experimental results show that the waviness and form error are well detected.