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AL-Scan;을 이용한 술 전 안구생체계측과 백내장 수술 후 굴절력 예측의 정확성
김성인,강석재,오태훈,최진석,백남호,Sung In Kim,Sug Jae Kang,Tae Hoon Oh,Jin Seok Choi,Nam Ho Baek 대한안과학회 2013 대한안과학회지 Vol.54 No.11
Purpose: To compare the axial lengths, anterior chamber depths, and keratometric measurements and to predict postoperative refractions of AL-Scan<sup>®, IOL master<sup>®, and ultrasound. Methods: A total of 40 eyes in 30 patients who received cataract surgery were included in the present study. The axial length, anterior chamber depth, and keratometry were measured by 2 types of partial coherence interferometry (AL-Scan<sup>®and IOL master<sup>®) and ultrasound. The SRK/T formula was used to calculate IOL power, and the predictive error which subtracts predictive refraction from postoperative refraction was compared among the ocular biometry devices. Results: Axial lengths were 23.08 ± 0.62 mm, 23.09 ± 0.62 mm, and 22.99 ± 0.62 mm measured by AL scan<sup>®, IOL master<sup>®, and ultrasound, respectively. Axial length measured by ultrasound was statistically significantly shorter than AL scan<sup>® and IOL master<sup>® (p < 0.001, p < 0.001, respectively). The anterior chamber depth and keratometry were 3.11 ± 0.06 mm and 44.82 ± 1.34 D measured by AL scan<sup>®, and 3.13 ± 0.06 mm and 44.85 ± 1.26 D measured by IOL master<sup>®, respectively. The differences of anterior chamber depth and keratometry between the 2 devices were not statistically significant (p = 0.226, p = 0.331, respectively). The mean absolute prediction errors were 0.44 ± 0.35 D, 0.40 ± 0.34 D, and 0.39 ± 0.30 D in AL-Scan<sup>®, IOL master<sup>® and ultrasound, respectively, and were not statistically significantly different (p = 0.843, p = 0.847, p = 1.000, respectively). Conclusions: The ocular biometric measurements and prediction of postoperative refraction using AL-Scan<sup>® were as accurate as IOL master<sup>® and ultrasound. J Korean Ophthalmol Soc 2013;54(11):1688-1693
Structural information-based trilateral filter를 사용하는 효율적인 cost aggregation 방법
여윤재(Yoon-Jae Yeo),지서원(Seo-Won Ji),강석재(Seok-Jae Kang),고성제(Sung-Jea Ko) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
This paper presents an improved cost aggregation method which resolves the image ambiguity around the object boundary with the similar color. Unlike the conventional cost aggregation method using the bilateral filter which considers the photometric similarity and the geometric similarity, the proposed method aggregates the cost using a trilateral filter based on the structural information. Experimental results show that the proposed method outperforms the conventional method.
손실된 동적 영역을 고려한 개선된 가중치 맵 기반의 다중 노출 영상 합성 방법
지서원(Seo-Won Ji),강석재(Seok-Jae Kang),김승욱(Seung-Wook Kim),김채성(Chae-Sung Kim),고성제(Sung-Jea Ko) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.6
A high dynamic range (HDR) image can be synthesized by using a set of differently exposed low dynamic range (LDR) images. However, ghosting effects often appear in a scene with moving objects. In general, anti-ghosting which consists of detection and correction of moving object regions tends to eliminate image details in the moving object regions. This paper presents a new correction method to preserve image details. For each moving object region, input LDR images are classified into ghosting and non-ghosting images using K-means clustering. The non-ghosting LDR images are utilized to produce final HDR image. Experimental results show that the proposed method achieves better visual quality and detailed information in the synthesized HDR image, compared with the conventional methods.
이종연(Lee Jong Yeon),강석형,김상중(Kim Sang Jung),강석재(Kang Seok Jae),성호진(Sung Ho Jin),유영돈(Yoo Young Don),윤용승(Yun Yong Seung) 한국에너지기후변화학회 2008 에너지기후변화학회지 Vol.3 No.1
In order to utilize incineration waste heat from industrial wastes, survey of the waste heat utilization status for each incineration site, suggestion of its utilization methods, analysis of cost-benefit for the methods, and suggestion of support policy were conducted. Utilization ratio of surplus heat from industrial wastes was 54%. The surplus heat is equivalent to the calories of 141,000 ㎘ heavy oil resulting in reduced its import of 54.3 billion won. For 12 incineration sites, useful utilization methods are district heating, temperature control of process, treatment of landfill leachate, and sewage dry depending on site conditions. To increase utilization of waste heat, improved systems (e.g. realization of a feed unit cost, approval of CDM business, incentive for a green company designation, etc) and economic supports (e.g. a low interest loan, a government subsidy, an increased investment tax credit, etc) were suggested.