• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.464-466
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• 2003

In this paper an advanced algorithm for selecting a seam line automatically, which used to be selected by human operator for mosaicked images is presented. In addition to four factors proposed by automation theory, the FOM(Figure Of Merit) of tie point were taken into account to suggest the method to select a seam line applicatively and the algorithm was applied to mosaic test images.

• Journal of the Optical Society of Korea
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• v.9 no.4
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• pp.145-150
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• 2005

The method to obtain four speckle patterns with relative phase shift of $\pi$/2 by passive devices such as two waveplates and a linear polarizer, and to calculate the phase at each point of the speckle pattern in shearography with a Wollaston prism is described. In this paper, we analyze its potential error sources caused by wave plates.

• Korean Journal of Materials Research
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• v.18 no.5
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• pp.253-258
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• 2008

A simple method to deposit carbon nanotube films uniformly on large area substrates using an arc discharge method is reported in this paper. The arc discharge method was modified to deposit carbon nanotube films in situ on the substrates. The substrates were scanned several times over the arcing point for a uniform film thickness. Deposition was carried out under variable dc bias conditions at 600 torr of $H_2$ gas. The thickness uniformity of the single-wall carbon nanotube films as characterized by a four-point probe was within 30% deviation. The morphology and crystal quality of the single-wall carbon nanotube film were also characterized by field emission scanning electron microscopy and Raman spectroscopy.

• Journal of Korean Academy of Nursing
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• v.7 no.2
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• pp.22-30
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• 1977

An analysis of the Nursing activities was carried out during the period of October 6 - 10, 1975 for five days, at postanesthetic room in Seoul National University Hospital. Continuous Time Study method was applied to this study by Observing and checking the activities performed by 8 nursing personnel at head nurse, staff nurse, and nurse aide level. Six nursing Students and 6 staff nurses observed and recorded all activities during the day and the evening for 5 days after certain process of training. Following results were obtained I 1. Percentages of nursing activity os were identified at each level of nursing personnel according to the skill Level 1) Thirty three point forty two Percent of the total head nurse's activities were spent by administrative activities, 21,33% by Clerical activities, 10.63% by Nursing activities, 6.54% by Messenger activities, 4.0% by Housekeeping activities, and 24. 08% by Unclassified activities, 2) Forty point forty two percent of the total staff nurses'activities were spent by Nursing activities, 12.7% by Administrative activities, 8.03% by Housekeeping activities, 3.08% by Clerical activities, 2.03% by Messenger activities, 0.08% by Dietary activities, and 34.19 o/e by Unclassified activities. 3) Thirty six point sixty three percent of the total nurse aide's activities were spent by Messenger activities, 14.4% by Housekeeping activities, 2.2% by Nursing activities, 1.0% by Clerical activities, 0.83% by Administrative activities, and 44.94% by Unclassified activities, 2. Percentages of nursing activities were identified at each level of nursing personnel according to area of activity. 1) Thirty three point ninety six percent of the total head nurse's activities were spent by Unit - Centered activities, 30.26% by Patient - Centered activities, 8.69 % by Personnel - Centered activities and 24.09 o/o by Other - Centered activities. 2) Fifty two point seventy four percent of the total staff nurses' activities were spent by Patient - Centered activities, 11.5 % by Unit -Centered activities, 1.68 % by Personnel -Centered activities and 34.02% by Other - Centered activities. 3) Forty nine point sixty seven Percent of the total Nurse aide's activities were spent by Unit -Centered activities, 5.13% by Patient -Centered activities, 0.27% by Personnel -Centered activities and 44.93%by Other -Centered activities. 3. Percentages of staff nurses' activities were identified at each skill Level according to their shifts. 1) Forty four point eighty one percent of the total day time activities were spent by Nursing activities, 13.62% by Administrative activities, 6.37% by Housekeeping activities, 2.08% by Clerical activities, 1.74 % by Messenger activities, 0.07% by Dietary activities and31.31 o/o by Unclassified activities. 2) Thirty three point eighty seven percent of the total evening time activities were spent by nursing activities, 10.51% by Housekeeping activities, 10.0% by Administrative activities, 4.58% by Clerical activities, 2.46% by Messenger activities, 0.09% by Dietary activities and 38.49% by Unclassified activities, 4. There was no great difference among activities of 5 days.

• Journal of Mechanical Science and Technology
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• v.18 no.8
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• pp.1368-1374
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• 2004

The remaining life estimation for the aged components in power plants as well as chemical plants are very important because mechanical properties of the components are degraded with in-service exposure time in high temperatures. Since it is difficult to take specimens from the operating components to evaluate mechanical properties of components, nondestructive techniques are needed to evaluate the degradation. In this study, test materials with several different degradation levels were prepared by isothermal aging heat treatment at $630^{\circ}C$. The DC potential drop method and destructive methods such as tensile and fracture toughness were used in order to evaluate the degradation of 1Cr-1Mo-0.25V steels. In this result, we can see that tensile strength and fracture toughness can be calculated from resistivity and it is possible to evaluate material degradation using DC potential drop method, non-destructive method.

• Proceedings of the KIEE Conference
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• 2001.11c
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• pp.215-218
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• 2001

To improve the performance of PID controller of high order systems by model reduction, we proposed a new model reduction method in frequency domain. A new model reduction method we proposed, considered four points (${\angle}G(jw)=0$, $-{\pi}/2$, $-{\pi}$, $-3{\pi}/2$) in stead of two points (${\angle}G(jw)=-{\pi}/2$, and $-{\pi}$) in Nyquist curve. And for high order systems that it have not two point (${\angle}G(jw)=-{\pi}/2$, and $-{\pi}$) in Nyquist curve, we proposed a method to annex very small dead time. This method has a annexed very small dead time on the base model for reduction, and we cancel it after to get the reduced model. It is shown that the performance of proposed method is better than any other methods.

• International Journal of Naval Architecture and Ocean Engineering
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• v.13 no.1
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• pp.136-146
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• 2021

This paper aims to numerically estimate the dynamic ice load on a conical structure. The Discrete Element Method (DEM) is employed to model the level ice as the assembly of numerous spherical particles. To mimic the realistic fracture mechanism of ice, the parallel bonding method is introduced. Cases with four different ice drifting velocities are considered in time domain. For validation, the statistics of time-varying ice forces and their frequencies obtained by numerical simulations are extensively compared against the physical model-test results. Ice properties are directly adopted from the targeted experimental test set up. The additional parameters for DEM simulations are systematically determined by a numerical three-point bending test. The findings reveal that the numerical simulation estimates the dynamic ice force in a reasonably acceptable range and its results agree well with experimental data.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2036-2038
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• 2001

In this paper, we propose the neural network based emotion recognition method for intelligently recognizing the human's emotion using vision system. In the proposed method, human's emotion is divided into four emotion (surprise, anger, happiness, sadness). Also, we use R,G,B(red, green, blue) color image data and the gray image data to get the highly trust rate of feature point extraction. For this, we propose an algorithm to extract four feature points (eyebrow, eye, nose, mouth) from the face image acquired by the color CCD camera and find some feature vectors from those. And then we apply back-prapagation algorithm to the secondary feature vector(position and distance among the feature points). Finally, we show the practical application possibility of the proposed method.

• Structural Engineering and Mechanics
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• v.68 no.6
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• pp.647-660
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• 2018

The Incremental Dynamic Analysis (IDA) procedure is currently known as a robust tool for estimation of seismic collapse capacity. However, the procedure is time-consuming and requires significant computational efforts. Recently some simplified methods have been developed for rapid estimation of seismic collapse capacity using pushover analysis. However, a comparative review and assessment of these methods is necessary to point out their relative advantages and shortcomings, and to pave the way for their practical use. In this paper, four simplified pushover analysis-based methods are selected and applied on four regular RC intermediate moment-resisting frames with 3, 6, 9 and 12 stories. The accuracy and performance of the different simplified methods in estimating the median seismic collapse capacity are evaluated through comparisons with the results obtained from IDAs. The results show that reliable estimations of the summarized 50% fractile IDA curve are produced using SPO2IDA and MPA-based IDA methods; however, the accuracy of the results for 16% and 84% fractiles is relatively low. The method proposed by Shafei et al. appears to be the most simple and straightforward method which gives rise to good estimates of the median sidesway collapse capacity with minimum computational efforts.

• Journal of the Korean Society for Nondestructive Testing
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• v.34 no.2
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• pp.148-154
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• 2014

Photoelasticity is a useful technique for obtaining the differences and directions of principal stresses in a model. In conventional photoelasticity, the photoelastic parameters are measured manually point by point. Identifying and measuring photoelastic data is time-consuming and requires skill. The fringe phase shifting method was recently developed and has been found to be convenient for measuring and analyzing fringe data in photo-mechanics. This paper presents an experimental study on the stress distribution along a horizontal line that passes the central point of a rhombus plate made of Photoflex (i.e., type of urethane rubber). The isoclinic fringe and/or principal stress direction is constant on this horizontal line, so a four-bucket phase shifting method can be applied. The method requires four photoelastic fringes that are obtained from a circular polariscope by rotating the analyzer at $0^{\circ}C$, $45^{\circ}C$, $90^{\circ}C$ and $135^{\circ}C$. Experimental measurements using the method were quantitatively compared with the results from FEM analysis; the results from the two methods showed comparable agreement.