• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.4C
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• pp.276-282
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• 2005

These studies developed system as well as its algorithm which can measure traffic flow and vehicle speed on the highway as well as road by using industrial television(ITV) system. This algorithm used the real time processing of dynamic images. The processing algorithm of dynamic images is developed and proved its validity by frame grabber. Frame grabber can process the information of a small number of sample points only instead of the whole pixel of the images. In the techniques of this algorithm, we made approximate contour of vehicle by allocating sampling points in cross-direction of image, and recognized top of contour of vehicle. Applying these technique, we measured the number of passing vehicles of one lane as well as multilane. Speed of each vehicle is measured by computing the time difference between a pair of sample points on two sample Points lines.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.37 no.6
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• pp.10-21
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• 2000

The Cellular Noninear Networks structure for Distance Transform(DT) and the robust optical flow detection algorithm based on the DT are proposed. For some applications of optical flows such as target tracking and camera ego-motion computation, correct optical flows at a few feature points are more useful than unreliable one at every pixel point. The proposed algorithm is for detecting the optical flows on the trajectories only of the feature points. The translation lengths and the directions of feature movements are detected on the trajectories of feature points on which Distance Transform Field is developed. The robustness caused from the use of the Distance Transform and the easiness of hardware implementation with local analog circuits are the properties of the proposed structure. To verify the performance of the proposed structure and the algorithm, simulation has been done about various images under different noisy environment.

• Ecology and Resilient Infrastructure
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• v.8 no.1
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• pp.22-31
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• 2021

Surface image velocimetry (SIV) is a noncontact velocimetry technique based on images. Recently, studies have been conducted on surface velocity measurements using drones to measure a wide range of velocities and discharges. However, when measuring the surface velocity using a drone, reference points must be included in the image for image correction and the calculation of the ground sample distance, which limits the flight altitude and shooting area of the drone. A technique for calculating the surface velocity that does not require reference points must be developed to maximize spatial freedom, which is the advantage of velocity measurements using drone images. In this study, a technique for calculating the surface velocity that uses only the drone position and the specifications of the drone-mounted camera, without reference points, was developed. To verify the developed surface velocity calculation technique, surface velocities were calculated at the Andong River Experiment Center and then measured with a FlowTracker. The surface velocities measured by conventional SIV using reference points and those calculated by the developed SIV method without reference points were compared. The results confirmed an average difference of approximately 4.70% from the velocity obtained by the conventional SIV and approximately 4.60% from the velocity measured by FlowTracker. The proposed technique can accurately measure the surface velocity using a drone regardless of the flight altitude, shooting area, and analysis area.

• The Korean Journal of Applied Statistics
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• v.28 no.3
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• pp.485-494
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• 2015

Canonical correspondence analysis is an ordination method used to visualize the relationships among sites, species and environmental variables. However, projection results are fluctuations if the samples slightly change and consistent interpretation on ecological similarity among species tends to be difficult. We use the bootstrap methods for canonical correspondence analysis to solve this problem. The bootstrap method results show that the variations of coordinate points are inversely proportional to the number of observations and coverage rates with bootstrap confidence interval approximates to nominal probabilities.

• Journal of Korean Clinical Health Science
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• v.9 no.2
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• pp.1502-1510
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• 2021

Purpose. To investigate on the awareness of consumers on the expertise of optometrists. Methods. Data were collected and analyzed through an online questionnaire targeting 63 consumers (42 consumers over the age of 10 who wore glasses, and 21 students in the Department of Optometry). Result. As a consideration when choosing an optometrist, consumers considered the variety of products (15 persons(23.8%)), expertise such as optometry and fitting, kindness and credibility (11 persons(17.5%)). Students in the Department of Optometry of each selected expertise such as optometry and fitting, kindness and credibility (5 persons(7.9%)) and the results were high. In addition, about the main tasks of optometrists, 20 consumers (31.7%) and 9 students (14.3%)(SD 14.5±5.5) answered that they were medical technicians specializing in vision health. And the service satisfaction of the optometrist (5 point scale) was evaluated as 3.77 points for the consumers and 3.76 points for students(SD 3.77±0.01), and the reliability (5 point scale) for the consumers was 3.42 points and students 3.53 points (SD 3.48±0.06). In terms of expertise (5 point scale), the consumers scored 3.47 points and current students 3.58 points (SD 3.53±0.06). Conclusion. As a result of the study on consumer awareness of the expertise of optometrists, there was no significant difference in the perceptions of the reliability, service, and expertise of optometrists in the opinion of the consumers and students of the Department of Optometry. In terms of reliability and expertise, students in the Department of Optometry were evaluated somewhat higher than the consumers. Therefore, in order for consumers to be able to trust the expertise of optometrists in the future, it is necessary to take pride in being a medical technician specializing in vision health, and to actively promote and make efforts to inform consumers that optometrists are experts recognized by the state.

• Journal of the Korean Society for Railway
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• v.12 no.1
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• pp.16-24
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• 2009

In this study, fatigue crack growth rate of a cracked railway bogie frame under variable amplitude loading is predicted by applying linear elastic fracture mechanics. For this purpose, we find the critical points by reference surveying on cracked railway bogie frames. And we make an effective load history by synthesizing the dynamic load measured from the critical points of railway bogie frame during commercial line operation and the static load calculated from structural analysis. Crack growth analyses are performed at the 3 critical points under the commercial operation loading condition by assuming an initial crack size as 40 mm. and the results are compared with the experimental results from Japanese railway bogie frame crack growth case. From the analysis results, we find that around 500,000 km operating distance is necessary to bring crack growth from the initial crack to unstable crack. And it takes around 3.8 normal operating years. We conclude that it is enough time to detect the crack between normal maintenance period.

• The Journal of the Korean dental association
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• v.56 no.11
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• pp.631-640
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• 2018

Nowadays computer-guided "flapless" surgery for implant placement using templates is gaining popularity among clinicians and patients. The advantages of this surgical protocol are its minimally invasive nature, accuracy of implant placement, predictability, less post-surgical discomfort and reduced time required for definitive rehabilitation. Aim of this study is to describe the digital implant protocol, thanks to which is now possible to do a mini-invasive static guided implant surgery. This is possible thanks to a procedure named surface mapping based on the matching between numerous points on the surface of patient's dental casts and the corresponding anatomical surface points in the CBCT data. With some critical points and needing an adequate learning curve, this protocol allows to select the ideal implant position in depth, inclination and mesio-distal distance between natural teeth and or other implants enabling a very safe and predictable rehabilitation compared with conventional surgery. It represents a good tool for the best compromise between anatomy, function and aesthetic, able to guarantee better results in all clinical situations.

• The Journal of Fisheries Business Administration
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• v.40 no.1
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• pp.97-112
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• 2009

The amendment of regulation affecting the Governing Body of NFFC (National Federation of Fisheries Cooperatives) has been known to the public in May 2008. Its essential points are as follow: 1) the President of NFFC shall be a non-standing officer. 2) the Full-Time Directors shall have the authority to deal with all subjects except for those especially reserved for the General Meeting or Board of Directors, while minimizing the authority of NFFC President. By providing this amendment, the government seeks to make the Governing body becomes professionalized and the management functions carried out by full-time professional board members. However, the amendment seems to pay no attention to the co-operative's identity and principles. In this context, five issues will be discussed: 1) Strengthening the separation between ownership and control of NFFC. 2) Weakening the authority of General Meeting. 3) The bounds of Audit Committee. 4) Consolidating the management control of the Full-Time Directors. 5) The loss of NFFC's Identity, followed by a summary and conclusion.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2008.04a
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• pp.499-504
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• 2008

Recently, the problem controlling lateral drift is important in tall buildings for improvement in economic efficiency and habitability. But, the Outrigger System, general used for tall building in Korea, has weak points with the occupancy of special space and the long duration of works. The dampers are applied to actively control building's response by earthquake and wind load in these days. Accordingly, we analyze the effect of the drift control using various dampers to substitute for the Outrigger System as the efficient system in tall buildings.

• Journal of Haehwa Medicine
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• v.16 no.1
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• pp.17-29
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• 2007

Objectives : The purpose of this study is to search acupuncture & moxibustion treatment on hemafecia. Methods : We search thirty-seven oriental medical literatures related to hemafecia and arrange the articles according to the etiological cause, pathogenesis, acupuncture & moxibustion treatment. Results : 1. Hemafecia is mainly caused by intrinsic factors such as inadequate diet, habitual drinking, indiscreet sex and others. 2. Hemafecia is mainly due to the intestinal febrile state, but sometimes due to the infirmity of whole body energy including digestive system. 3. Governor Vessel Meridian, Bladder Meridian, Spleen Meridian and Stomach Meridian are frequently used for acupuncture & moxibustion treatment on hemafecia. 4. B57, GV1 are most frequently used for acupuncture & moxibustion treatment on hemafecia. 5. CV12, CV6, S36 are most frequently used for moxibustion treatment on hemafecia. 6. Acupuncture points are mainly distributed throughout the low back, lower abdomen and lower limb.