• Proceedings of the Korea Database Society Conference
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• 2000.11a
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• pp.186-197
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• 2000

기업의 해체 이후 등장한 인터넷 비즈니스 기업들은 기존의 오프라인 기업들과는 달리 비즈니스에 의한 수익을 올리지 못하고 있다. 아직도 임계점에 도달하지 못해서 그런 것일까\ulcorner 아니면 기존의 수익 구조로는 어떤 한계가 있는 것일까\ulcorner 많은 연구에서 인터넷 비즈니스는 선점의 효과를 강조하고 있다. 경쟁에서 먼저 임계점에 도달한 인터넷 기업들은 주가로 보상을 받고 있기도 하다. 그러나, 임계점에 도달한 기업이 아직도 비즈니스에 의한 수익의 창출에는 그다지 성과를 올리지 못하고 있는 것 같다. 본 연구에서 주장하는 것은 다음의 두 가지이다. 첫째는, 인터넷 비즈니스 기업들은 임계점을 중시한 나머지 수익 구조에 대한 전략의 수립에 실패하였다. 둘째는, 인터넷 비즈니스 기업들은 기존의 오프라인 기업들과는 달리 온라인 기업 중심으로 이루어 졌기 때문에 기존의 오프라인 기업들과는 근본적으로 다른 수익 구조를 가져야 할 것이다. 즉, 기존의 온라인 기업들의 사업 방식과는 달라야 한다. 누구나 흉내낼 수 있는, 그래서 경쟁상의 우위를 지속적으로 유지시키기가 어려운, 운영의 효율성 중심이 아닌, 어떤 차별화된 전략을 가져야 할 것이다.

• Proceedings of the Optical Society of Korea Conference
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• 2000.08a
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• pp.44-45
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• 2000

Shack-Hartmann 센서로부터 얻어진 기울기 정보로부터 파면을 재구성하고 분석하기 위해서는 각각의 점 영상에 대한 위상 구배로부터 파면의 위상을 재구성할 수 있는 수학적인 알고리즘이 필요하다. 파면의 위상을 재구성하기 위한 알고리즘은 Hudgin, Fried, Southwell이 제시한 세 가지 방법에 대한 연구결과가 가장 많이 알려져 있다. 본 연구에서는 CCD 카메라로부터 전송된 디지털 영상에서 각각의 점 영상의 중심점을 추출하여 점 영상의 이동정보로부터 수평과 수직방향의 기울기를 계산하고, 이를 바탕으로 최소제곱법(least-square fitting)을 사용하여 위상을 재구성하였다. 파면의 기울기 정보로부터 파면을 재구성하기 위해 기존의 이론을 바탕으로 행렬계산법을 사용하여 각각의 경우를 일반화하였고, 위상의 복구와 파면의 보정에 따른 해석적인 오차의 관계를 논의하였다. (중략)

• Proceedings of the Korean Operations and Management Science Society Conference
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• 1992.04b
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• pp.393-402
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• 1992

살상면적을 이용한 기존의 효과분석방법론 SQ2는 표적중심점을 조준점으로 하여 사격하는 것으로 가정하고 있다. 본 연구에서는 조준점 좌표에 관계없이 표적의 피해확률을 계산할 수 있는 효과분석방법론 MOSSE를 소개한다. MOSSE는 조준좌표에 관계없이 표적의 피해확률을 계산할 수 있다.

• Journal of Korean Society for Geospatial Information Science
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• v.20 no.1
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• pp.93-99
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• 2012

This study aims to identify spatio-temporal land price change pattern in Gongju city including the area incorporated and surrounding area depending on the Multifunctional Administrative City Construction. For this, GIS data was built by calculating the average land price each 209 Dong and Ri by the time of the year 2000, 2005 and 2010 based on. The first, the change in the land price was to identify in the 5-year intervals through a kriging interpolation as a kind of geostatistical techniques. The second, a trend analysis was conducted to know directional change pattern of the east-west axis and the north-south axis. Finally, the weighted mean center was calculated by the land price at a weight to examine moving direction on the center point of land price, point of view. The result is that the land price change pattern appeared visible higher growth on the eastern built in the Multifunctional Administrative City, moving direction on the center point of the land price appeared that the phenomenon was concentrated in the northeastern area.

• Korean Journal of Optics and Photonics
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• v.9 no.6
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• pp.362-367
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• 1998

Center Distance Finding (CDF) is a technique to find the sphere diameter by measuring the distance between two contacting spheres. The focal spots of the sphere clusters are formed in the back-focal plane by the transmission-mode optical microscope with the pseudothermal illumination source. Digital images taken by the CCD camera were processed by the software called Global Lab Image. The centers of the focal spots are found and the spot positions are expressed in terms of the CCD pixel elements, whose coordinate are calibrated by a heterodyne interferometer. The new CDF measurement system has been developed, which are more advantageous in time and convenience than the existing system, while the measurement uncertainly remains sufficient for its use as a magnification standard for optical microscopy. Two kinds of polystyrene spheres whose nominal diameters 3 and 10 $\mu\textrm{m}$ (NIST SRM 1962 and 1960) are measured with the uncertainly less than 1% at the confidence level of 99%, and the results are compared with the results of National Institute of Standards and Technology.

• Korean Journal of Optics and Photonics
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• v.19 no.1
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• pp.1-8
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• 2008

Shack-Hartmann sensors are widely employed as a wavefront measuring device in various applications. Adaptive optics is one of the major applications. Since an adaptive optics system should be operated in real-time, high-speed wavefront sensing is essential. In high-speed operation, integration time of an image detector is very short. In this case, noises such as readout noise and photon noise greatly influence the accuracy of wavefront sensing. Therefore a fast and noise-insensitive centroid finding algorithm is required for the real-time wavefront sensing. In this paper, the multi-resolution correlation method is proposed. By employing multi-resolution images, this method greatly reduces the computation time when compared to the fast Fourier transform (FFT) correlation method. The verification is performed through the computational simulation. In this paper, the center of mass method, correlation method and multi-resolution correlation method are employed to compare the measurement accuracy of the centroid finding algorithms. The accuracy of a Shack-Hartmann wavefront sensor using the proposed algorithm is proved to be comparable to that of the conventional correlation method.

• Journal of the Korean Applied Science and Technology
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• v.37 no.6
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• pp.1790-1797
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• 2020

This study was conducted to evaluate the nursing practice environment, moral distress, and the factors that influence person-centered care and the experience of person-centered care among nurses working in a long-term care hospitals. 154 nurses who was working in long-term care hospitals in D city and G province were evaluated. Date were collected from May 1st to 31th, 2020 and analyzed using the SPSS/WIN 25.0 program. The mean score of nursing practice environment was 2.42, the moral distress was 3.27, and person-centered care was 3.60. Person-centered care showed significantly positive correlations with moral distress(r=.53, p<.001) and showed significantly positive correlations with nursing practice environment(r=.32, p<.001). Regression analysis revealed that the factors which significantly influenced person-centered care were nursing practice environment and moral distress. Therefore, in order to increase person-centered care, nursing intervention programs that improve the nursing practice environment and reduce moral disgtress are required for nurses working in long-term care hospitals.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.23 no.1
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• pp.123-133
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• 2024

Existing autonomous driving technology has been developed based on sensors attached to the vehicles to detect the environment and formulate driving plans. On the other hand, it has limitations, such as performance degradation in specific situations like adverse weather conditions, backlighting, and obstruction-induced occlusion. To address these issues, cooperative autonomous driving technology, which extends the perception range of autonomous vehicles through the support of road infrastructure, has attracted attention. Nevertheless, the real-time analysis of the 3D centroids of objects, as required by international standards, is challenging using single-lens cameras. This paper proposes an approach to detect objects and estimate the centroid of vehicles using the fixed field of view of road infrastructure and pre-measured geometric information in real-time. The proposed method has been confirmed to effectively estimate the center point of objects using GPS positioning equipment, and it is expected to contribute to the proliferation and adoption of cooperative autonomous driving infrastructure technology, applicable to both vehicles and road infrastructure.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.47 no.1
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• pp.17-24
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• 2010

This paper proposed the method to separate a liver into left and right liver lobes for exact volumetry of the river graft at abdominal MDCT(Multi-Detector Computed Tomography) image before living donor liver transplantation. On the image of segmented liver, 4 points(the middle point of Inferior Vena Cava, a point of Middle Hepatic Vein, a point of Portal Vein, a middle point of gallbladder fossa) are selected. A liver is separated into left and right liver lobes on the basis of the 4 points. The volume and ratio of the river graft are estimated. The volume estimated using 4 points and the manual volume that radiologist processed and estimated are compared with the weight measured during surgery to support proof of the exact volumetry. After selection the 4 points, the time involved in separation a liver into left and right river lobe and volumetry of them is measured for confirmation that the algorithm can be used on real time during surgery. This study progressed to ensure donor's and recipient's safe who will undergo the liver transplantation.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.159-160
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• 2016

본 연구는 우리나라 수출입 컨테이너화물의 5대 내륙기종점 권역별로 항만집중도 및 변이효과를 분석함으로써, 항만간 경쟁 구도 및 효율적인 컨테이너부두 개발 및 운영에 대한 시사점을 도출하고자 한다. 2011년, 2006년, 2011년의 항만별 내륙기종점 조사자료를 바탕으로 허쉬만-허펜달지수 및 변이할당법을 활용하여 분석하였다.