http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Shack-Hartmann 센서를 이용한 파면측정의 정확도 향상에 관한 연구
노경완,엄태경,김지연,박상훈,윤성기,이준호,Roh, Kyung-Wan,Uhm, Tae-Kyoung,Kim, Ji-Yeon,Park, Sang-Hoon,Youn, Sung-Kie,Lee, Jun-Ho 한국광학회 2006 한국광학회지 Vol.17 No.5
Shack-Hartmann 파면측정 센서는 적응광학 분야에서 파면측정용으로 가장 널리 사용되고 있다. Shack-Hartmann 센서에서 파면측정 알고리즘은 크게 점영상의 중심점 탐색 알고리즘과 파면복원 알고리즘으로 나눌 수 있다. 이 중 점영상의 중심점 탐색은 파면측정 결과에 크게 영향을 미치나 많은 연구결과에도 불구하고 최적의 중심점 측정 알고리즘 및 내부 변수 설정에 대한 일반적인 해결책은 아직 제시되지 못하고 있다. 현재, 중심점 탐색 알고리즘으로는 무게중심법(center of gravity)이 가장 널리 사용되고 있다. 본 연구에서는 중심점 탐색 알고리즘에 의한 측정 정확도 분석을 위해 무게중심법과 상관관계법(correlation)을 함께 고려하였다. 이를 위해 Shack-Hartmann 센서의 파면측정 과정을 전산모사하였고, 이로부터 중심점 탐색 알고리즘과 관련하여 무게중심법 및 상관관계법에서의 노이즈 특성을 비교, 분석하였다. 또한, 무게중심법에서 문턱값(threshold value)의 설정에 따른 파면측정의 정확도에 대한 분석을 통하여 노이즈 제거를 위한 최적의 문턱값을 제안하였다. 이와 더불어 Shack-Hartmann 센서 시스템을 구성하여 디포커스(defocus)를 발생시키고 이를 측정하는 실험을 수행함으로써 파면측정 알고리즘 및 전산모사 결과를 검증하였다. The SharkHartmann wavefront sensors are the most popular devices to measure wavefront in the field of adaptive optics. The Shack-Hartmann sensors measure the centroids of spot irradiance distribution formed by each corresponding micro-lens. The centroids are linearly proportional to the local mean slopes of the wavefront defined within the corresponding sub-aperture. The wavefront is then reconstructed from the evaluated local mean slopes. The uncertainty of the Shack-Hartmann sensor is caused by various factors including the detector noise, the limited size of the detector, the magnitude and profile of spot irradiance distribution, etc. This paper investigates the noise propagation in two major centroid evaluation algorithms through computer simulation; 1st order moments of the irradiance algorithms i.e. center of gravity algorithm, and correlation algorithm. First, the center of gravity algorithm is shown to have relatively large dependence on the magnitudes of noises and the shape & size of irradiance sidelobes, whose effects are also shown to be minimized by optimal thresholding. Second, the correlation algorithm is shown to be robust over those effects, while its measurement accuracy is vulnerable to the size variation of the reference spot. The investigation is finally confirmed by experimental measurements of defocus wavefront aberrations using a Shack-Hartmann sensor using those two algorithms.
A Production-and-Scheduling for One-Vendor Multi-Buyer Model under the Consolidation Policy
노경완,성창섭,이익선 한국경영과학회 2014 經營 科學 Vol.31 No.3
This paper considers an integrated one-vendor multi-buyer production-inventory model where the vendor manufactures multiple products in lot at their associated finite production rates. In the model, it is allowed for each product to be shipped in lot to the buyers even before the whole product production is not completed yet. Each product lot is dispatched to the associated buyer in a number of shipments. The buyers consume their products at fixed rates. The objective is to the production and shipment schedules in the integrated system, which minimizes the total cost per unit time. The total cost consists of production setup cost, inventory holding cost and shipment cost. For the model, an iterative optimal solution procedure with shipment consolidation policy incorporated. It is then tested through numerical experiments to show how efficient and effective the shipment consolidation policy is.
전기자동차의 에너지효율 및 1회충전 주행거리 측정을 위한 단축 시험방법 연구
노경완,노만수 한국자동차공학회 2022 한국 자동차공학회논문집 Vol.30 No.6
The future of electric vehicle sales looks promising. According to the IEA, around 250 million electric vehicles will be sold globally as a 30 % sales share by 2030. Since its debut, EV technology has progressed significantly with dramatic sales. This indicates that EVs with a range of up to 500 km are now available on the market. It is good news for consumers; however, the problem is that EVs with a longer range need more time to have the energy efficiency and range tested based on SAE J1634. SAE recommends the multi-cycle test(MCT) rather than the single-cycle test(SCT) in order to avoid the long test duration required to measure the energy efficiency and range of EVs. However, it is still time-consuming because the present methodology requires the vehicle’s battery energy to be completely depleted. The main purpose of this study is to improve the present time-consuming test methodology. This study proposes better methodology with two ways, SPT1 and SPT2, in order to dramatically reduce the test time as the vehicle’s battery energy may be partially discharged. Therefore, SPT1 and SPT2 call for only two UDDS and one HFEDS as the essential driving modes on the test sequence. The test results show that SPT2 appears to be a more proper method than SPT1 for reducing the test time with similar test results on MCT, and it was statistically verified by the paired two sample t-test.
노경완,김충원,이준 조선대학교 동력자원연구소 1994 動力資源硏究所誌 Vol.16 No.2
In this paper, We designed a new multimedia authoring tool that will ease the development of multimedia application product and the editing of media data such as text, sound, graphic, video, etc. And then, described the structure of management, programming model and user interface of the new multimedia authoring tool called Prototype Viewer. This tool has special event pointers such as frame list, object list that indicate a attribute of the media and have nothing to do with the nature of the media. Using the event pointer, we can save a storage space of the disk and reuse the same media data. This authoring tool applies to Product announcement, Computer aided instruction, Information system, Business presentation, etc.
노경완,김충원 조선대학교 에너지.자원신기술연구소 1998 에너지·자원신기술연구소 논문지 Vol.20 No.1
This paper presents new system for remote image processing using a webcam such like a CCD camera and QuickCam Developed System composed an automatically renewable HTML documents and captured an image every minute in the server. If user selected a specific image processing method, server transfer a correspondent ActiveX control to the client. Using the image processing control, user open and process an image from the local, other client, and server Client accomplish most image processing by itself. Server capture and transfer images to the client. Therefore, we can minimize the processing load on the server.
충남대학교 부속동물병원에 의뢰된 개의 뇨결석 성분 분석 결과
노경완,송근호,조종기,박성준 忠南大學校 獸醫科大學 動物醫科學硏究所 2005 動物醫科學硏究誌 Vol.13 No.-
A retrospective analysis was performed with 14 cases of canine urolithiasis examined at Laboratory of Clinical Pathology, College of Veterinary Medicine, Chungnam National University in the period between January 2005 and November 2005. The female (8 cases) had most occurrence about 14 cases. The Shih-tzu (8 cases), Poodle (4 cases) had higher incidences than other breeds. Canine urolithiasis occurred from 1 year 3 months to 7 years 6 months, but the most prevalence age was 3 years. The major mineral component of calculi was calcium oxalate (64.28%) and struvite(21.44%).