• Textile Coloration and Finishing
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• v.28 no.3
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• pp.156-163
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• 2016

The 6 novel super hydrophobic bluish-green dyes, showing the maximum absorption at 600~650nm, were synthesized to dye polyolefin fibers such as polypropylene and high strength polyethylene fibers. Their absorption spectra appeared almost the same at visible range, which meant the length of alkyl substituents did not affect on color appearance of the dyes. The optimum length of alkyl group was determined as hexyl substituents from the practical point of view. From the dyeing results, the optimum dyeing condition was $130^{\circ}C$ for 1 hour. The good fastness ratings to washing, rubbing were obtained showing 4-5 for both fibers. Light fastness was obtained also good rating 4 for both fibers.

• Proceedings of the KIEE Conference
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• 1998.07a
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• pp.31-33
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• 1998

In this paper, the temperature rise within busbar part of high voltage GIS is calculated under the condition that the continuous current is carrying. Heat transfer by conduction and convection is considered between the current carryig conductor and SF6 gas. FLUX 2D which is a commercial electromagnetic and thermal analysis program is used. The results show reasonable temperature distribution.

• Proceedings of the Korea Institute of Applied Superconductivity and Cryogenics Conference
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• 2003.10a
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• pp.288-290
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• 2003

The transformer is expected to be an essential component of resistive type superconducting fault current limiter (SFCL) for both the increase of voltage ratings in SFCL and the simultaneous quench due to different critical current between HTSC elements. However, for the design to prevent the saturation of iron core and the effective fault current limitation, the analysis for operation of SFCL with consideration for the magnetization characteristics are required. In this paper, the fault current limiting characteristics related with the magnetization ones were investigated through the variation of the ratio of the number of turns in the 1st and the 2nd windings. The proper design condition with variation of the number of turns to make the effective fault current limiting operation could be determined.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.23 no.2
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• pp.164-168
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• 2010

The transformer is expected to be an essential component of a superconducting fault current limiter (SFCL) for both the increase of its voltage ratings and the simultaneous quench due to different critical current between high-$T_C$ superconducting (HTSC) elements comprising the SFCL. However, in order to perform the effective current limiting operation of the SFCL, the design for the SFCL considering the hysteresis characteristics of the iron core is required. In this paper, the influence of the hysteresis characteristics of the iron core comprising the transformer type SFCL on its current limiting characteristics was investigated. Through the comparative analysis on the hysteresis curves due to the ratio of the turn number between the 1st and the 2nd windings of the transformer, the proper design condition for the ratio of the turn number to achieve the effective current limiting operation of the transformer type SFCL could be obtained.

• Textile Coloration and Finishing
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• v.31 no.2
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• pp.98-106
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• 2019

The dyeability and fastness properties of super-hydrophobic navy dyes having different length of alkyl groups were investigated on ultra high molecular weight polyethylene fabrics. Those dyes exhibited strong color strength in the wavelength of mainly 550~650nm, which meant that they were navy color. From the results accomplished under various dyeing conditions, it can be concluded that those dyes have higher affinity on the fibers at $130^{\circ}C$ than at the lower dyeing temperature. Considering processing time and thermal damage of the fibers, one hour is good enough to obtain full strength of color. Maximum color strength was obtained at 2~3%owf of pure dyes. Except for the rub fastness under dry condition, all fastness such as to washing and light showed as good as of 4~5 ratings.

• Journal of the Ergonomics Society of Korea
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• v.15 no.2
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• pp.177-184
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• 1996

In light-weight hand tools, static posture may result in postural fatigue. Psotural tremor of the upper extremity in a static posture was measured to provide guidelines for hand tool weight. Postural tremor was measured on five levels of tool weitht : no weight, 400g, 800g, 1200g, and 1600g. Three types of camcorder recording postures were selected. For each condition, postural tremor was measured together with ENG of biceps, deltoid and pectoralis major, and Borg's CR-20 ratings of perceved exertion. Results of the experiment are as follows : frequency analysis of tremor revealed increased amplitude of frequency bands of 2-4Hz and 10-14Hz. Postural tremor of the upper extremeity maintained the initial level until fatigue developed. After the development of fatigue, the rate of change of postural tremor significantly increased. Different tool weights and hand postures showed different rates of tremor increase. Time tp fatigue and corresaponding endurance time were positively correlated with Borg's RPE scores.

• International conference on construction engineering and project management
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• 2013.01a
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• pp.507-508
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• 2013

International Roughness Index (IRI) has been widely used by state DOTs to quantify pavement smoothness. When pavement condition falls below certain IRI thresholds, corresponding pavement maintenance treatments should be considered for application. Selection of appropriate IRI thresholds is essential to tactical allocation of limited resources to improve the conditions of states' roadway systems. This selection process is often challenging, however, because IRI thresholds are largely determined by Perceived Ride Quality (PRQ), and PRQ differs in each state. In this paper, a framework is proposed to address this problem. Passenger raters will be randomly selected from predetermined geographic locations, and their PRQ ratings collected. Taking this perceived ride data, along with other data collected, a statistical analysis will be conducted to establish the relationship between measured IRI values and PRQ. Appropriate IRI thresholds will then be determined. Once this framework is implemented, state DOTs could make informative maintenance decisions, which are expected to greatly enhance the public perception of pavement conditions in today's challenging economy.

• Science of Emotion and Sensibility
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• v.17 no.2
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• pp.25-34
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• 2014

The current study investigates the impacts of empathic concern, as a personal trait, and rational/emotional appeal on responses over the campaigns to help the disabled. Empathic concern is an emotional personality known as strongly activating altruistic motivations. The experiment proceeded at two stages that in the first stage, the personal disposition was measured and in the second stage, the condition of appeal type was presented. Thus, the whole experimental design was empathic concern(2) ${\times}$ appeal type(2) on attitudes and behavioral intention. Individuals high in empathic concern showed higher ratings, compared to people low, on attitudes and behavioral intention in the condition of rational appeal. The difference between high and low empathic concern in the condition of emotional appeal was small.

• Journal of Intelligence and Information Systems
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• v.17 no.3
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• pp.25-41
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• 2011

Recently, support vector machines (SVMs) are being recognized as competitive tools as compared with other data mining techniques for solving pattern recognition or classification decision problems. Furthermore, many researches, in particular, have proved them more powerful than traditional artificial neural networks (ANNs) (Amendolia et al., 2003; Huang et al., 2004, Huang et al., 2005; Tay and Cao, 2001; Min and Lee, 2005; Shin et al., 2005; Kim, 2003).The classification decision, such as a binary or multi-class decision problem, used by any classifier, i.e. data mining techniques is so cost-sensitive particularly in financial classification problems such as the credit ratings that if the credit ratings are misclassified, a terrible economic loss for investors or financial decision makers may happen. Therefore, it is necessary to convert the outputs of the classifier into wellcalibrated posterior probabilities-based multiclass credit ratings according to the bankruptcy probabilities. However, SVMs basically do not provide such probabilities. So it required to use any method to create the probabilities (Platt, 1999; Drish, 2001). This paper applied AdaBoost algorithm-based support vector machines (SVMs) into a bankruptcy prediction as a binary classification problem for the IT companies in Korea and then performed the multi-class credit ratings of the companies by making a normal distribution shape of posterior bankruptcy probabilities from the loss functions extracted from the SVMs. Our proposed approach also showed that their methods can minimize the misclassification problems by adjusting the credit grade interval ranges on condition that each credit grade for credit loan borrowers has its own credit risk, i.e. bankruptcy probability.

• Korean Journal of Psychosomatic Medicine
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• v.9 no.2
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• pp.174-181
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• 2001

Objectives : The author investigated the rate of diagnostic agreement between consultants and consultees and concordance ratings on the consultees' recommendation to examine the interactive collaborativeness and find the factors that influence the reflectiveness on treatment. Methods : The subjects were 54 patients with delirium selected from 583 cases referred from other departments who were admitted to Hanyang University Kuri Hospital from July 1, 1995 to Dec. 31, 1997. The information on demographic data, diagnostic impression, symptoms, management before consultation, psychiatric recommendation, management after consultation, diagnoses at the referring departments and the psychiatric department on delirium was obtained by medical records and consultation papers retrospectively. The reflectiveness of the psychiatric recommendation was divided into complete concordance, partial concordance, and nonconcordance and among them the complete and partial concordance were considered for concordance. The reflectiveness was compared among all the departments and between medical unit and surgery unit. Results: The rate of diagnostic agreement on the cause of delirium was highest(85.7%) in organic brain syndrome and lowest in general medical condition(0%). There was no statistically significant differences between medical unit and surgery unit. Neither differences were there among all the departments. In comparing symptoms affecting the reflectiveness, it was 73.5% in impulsive and aggressive behavioral changes, whereas 40.0% in behavioral changes. Reflectiveness of psychiatric recommendation showed higher scores in the case of behavioral changes. The cases of sleep problem showed higher scores of reflectiveness. When these two symptoms of behavioral change and sleep problem were compared as one factor, the results suggested that there were significant differences. The cases with both two symptoms showed 80% in reflectiveness, and the cases with only one symptom or no symptoms showed 44.8% in reflectiveness. There were no statistical significances between concordance ratings and symptoms such as disturbance of consciousness, disorientation, and hallucination that cannot be easily evaluated at the referring departments. Conclusions : The rate of diagnostic agreement on the cause of delirium was highest in the case of organic brain syndrome in which lesions can be easily recognized. The factors that influence the reflectiveness of psychiatric recommendation were behavior changes and sleep disorders in the symptoms of evaluated cases.