• Journal of Welding and Joining
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• v.28 no.1
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• pp.41-46
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• 2010

The low alloy-steel material(1.0Cr-0.5Mo, SA213T12), which has widely been used for the waterwall tube in the conventional power plant, do not have enough creep rupture strength for waterwall tubes of the Ultra-supercritical(USC) boilers. According to this reason, the high-strength low alloy-steel(2.25Cr-1.0Mo, SA213T22) has newly been adopted for the waterwall tube in the USC boilers. This paper presents failure analysis on weld-joint of the waterwall tubes in USC boilers. Visual inspections were performed to find out the characteristics of the fracture. Additionally both microscopic characteristics and hardness test were carried out on failed tube samples. Failures seem to happen mainly because the welding process has not been conducted strictly.(preheating, P.W.H.T and so forth). Thus, this paper has the purpose to describe the main cause of the poor welding process and to explain how to prevent similar failures in those weld-joints.

• The Korean Journal of Nuclear Medicine
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• v.29 no.4
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• pp.473-477
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• 1995

Information about regional wall motion obtained with gated $^{99m}Tc-MIBI$ SPECT was compared in 23 subjects(4 normals) to echocardiography or contrast left ventriculography. Gated SPECT study using 20-30 mCi $^{99m}Tc-MIBI$ were aquired lot 8 frames/RR interval (aqusition time=40min.) and processed with Cine Mode computer protocol. Regional wall motion was assessed by visual analysis. The concordance with echocardiography was 88% and with contrast ventriculography was 78%. We conclude that gated $^{99m}Tc-MIBI$ SPECT was effective in assessing the regional wall motion with the information of regional perfusion in one study.

• The Journal of Internal Korean Medicine
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• v.36 no.4
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• pp.527-546
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• 2015

Objectives The purpose of this study was to investigate the correlation between gastric emptying measured by ultrasonography and Korean medical instruments of diagnosis and assessment in functional dyspepsia (FD) patients. Among the subgroups of FD, postprandial distress syndrome (PDS) is related to gastric motility disorder.Methods Ten patients with FD and particularly with PDS as well as 10 healthy controls were enrolled in the study from September to November 2015. The gastric emptying shown as the half-life of gastric volume (T_1/2) was measured by ultrasonography. The severities of spleen qi deficiency and dyspepsia symptoms were assessed by a spleen qi deficiency questionnaire (SQDQ) and the Nepean Dyspepsia Index-Korean version (NDI-K), respectively. In addition, a food retention questionnaire (FRQ), a damum questionnaire (DQ), a cold and heat questionnaire (CHQ), a deficiency and excess questionnaire (DEQ), and a visual analogue scale (VAS) of distention and fullness were completed by every participant.Results In comparison with the control group, the FD group showed significantly higher scores for the SQDQ, NDI-K, FRQ, DQ, DEQ, and VAS of distention and fullness. T_1/2 was also significantly higher in the FD group than in the control group. There were significant correlations between T_1/2 and the SQDQ score. However, there were no significant correlations between T1/2 and other questionnaire scores except for one item of the NDI-K.Conclusions According to these findings, it was determined that measuring gastric emptying using ultrasonography could be a quantitative indicator to diagnose spleen qi deficiency in FD patients.

• Journal of Biosystems Engineering
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• v.38 no.4
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• pp.287-294
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• 2013

Purpose: Greenhouses for a protected horticulture covered with a plastic or glass are easy to have weakness in a heat loss by deterioration, damage, poor construction, and so on. To grasp the vulnerable points of heat loss of the greenhouses is important for heating energy saving. In this study, an on-site heat loss audit and energy consulting system were developed for an efficient energy usage of a greenhouse. Method: Developed system was mounted with infrared thermal and visual cameras to grasp the heat loss from the greenhouse quickly and exactly, and a trial calculation program of heating load of greenhouse to provide farmers with the information of heating energy usage. Results: Developed system could print out the reports about the locations and causes of the heat losses and improvement methods made up by an operator. The mounted trial calculation program could print out the information of the period heating load and fuel cost according to the conditions of greenhouse and cultivation. The program also mounted the databases of the information on the 13 horticultural energy saving technologies developed by the Korea Rural Development Administration and simple economic analysis sub-program to predict the payback period of the technologies. Conclusion: The developed system was expected to be used as the basic equipment for an instructors of district Agricultural Technology and Extension Centers to conduct the energy consulting service for the farmers within the jurisdiction.

• Journal of Animal Science and Technology
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• v.54 no.3
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• pp.191-198
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• 2012

The objective of this study was to evaluate the potential use of a dielectric barrier discharge (DBD) plasma system to improve microbial safety of sliced cheese. The atmospheric pressure plasma (APP) effect on visual appearance and a sensory evaluation were also carried out. The number of Escherichia coli inoculated on cheese slices decreased by 0.09, 0.47, 1.16 and 1.47 log cycles with helium (4 liters/min [lpm]) and 0.05, 0.87, 1.89 and 1.98 log cycles with He/$O_2$ mixture (4 lpm/15 standard cubic centimeters per minute), after being treated with plasma for 1, 5, 10, and 15 min, respectively. Significant reductions were also observed in Staphylococcus aureus inoculated onto cheese slices ranging from 0.05 to 0.45 log cycles with He and from 0.08 to 0.91 log cycles with He/$O_2$-treated samples, respectively. Adding oxygen resulted in a significant increase in inactivation of both pathogens. No visible change in the plasma-treated cheese slices was observed even though the instrumental analysis showed a significant decrease in the $L^*$-value and an increase in the $b^*$-value. The cheese slices were damaged after 10 and 15 min of plasma treatment. In addition, significant reductions in sensory quality including flavor, odor, and acceptability of plasma-treated cheese slices were observed. The results indicate that the DBD plasma system has potential for use in sanitizing food products, although the effect was limited. Further development of the APP system is necessary for industrial use.

• Journal of Korean Physical Therapy Science
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• v.10 no.1
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• pp.7-17
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• 2003

The purpose of this study was to investigate the effect of the involved lower limb weight bearing training on symmetrical weight supporting rate improvement and gait characteristics of patients with hemiplegia including their gait velocity, cadence, stride length, step length of the non affected side, step length of the affected side, foot angle of the non affected side, foot angle of the affected side, base of support, and so on. The subject of the study was 28 men and women patients with hemiplegia from 22 to 77 age, among patients who doctor diagnosed as hemiplegia due to stroke or traumatic brain injury, were possible to do independent gait more than 45m without others assistance, the flexion contracture of hip pint was less than $15^{\circ}$, did not have contracture for knee pint and one more than $5^{\circ}$ for ankle joint, did not have contraindication for exercise or gait did not show visual defect due to brain injury. The patients, the subject of the study, were classified into 14 patients of treatment. group applying continuous involved weight bearing with general therapeutic exercise and 14 patients of control group applying general therapeutic exercise, and then analyzed their gait before and after exercise. Temporal distance gait analysis(Boening, 1977) was used to analyze their gait, and ink foot-print was applied as one of measurement methods. However, it was statistically signifiant in the change rate(%) of gait characteristics, and treatment group's patients with hemiplegia had been highly changed in gait characteristics in comparison with control group. From the above-mentioned results, could find that continuous involved weight bearing training for patients with hemiplegia was effective to improve their gait ability and it could increase the ability in comparison with general exercise.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.3
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• pp.359-364
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• 1995

This experiment was conducted to get the fundamental information about the difference in color and some chemical components of grey flue-cured tobacco cultivated in paddy field to compare with normal tobacco. Cured leaves of NC82 were separated with visual characters into three classes of slight, fair and severe symptoms of grey leaf by percentage of grey parts to whole leaf area, and compared to normal ones. Occurrence of grey leaves tended to be higher in lower stalk position than in upper ones. Cl, Mn and Fe content of grey leaves was much higher when it compared with normal leaves, and within the same leaf, grey parts were increased in Fe, Mn and Cl content than in those of normal parts but there was no appearent difference in total sugar, nicotine and Ca contents. Chemical analysis of grey leaf samples indicated that they contained more Fe, Mn and Cl contents than those of normal leaves. These tendencies in chemical traits were accordance with the degree of grey symptoms. Grey leaves showed remarkably lower b*value and slightly lower L*value than those of normal leaves, while a*value was mostly higher in grey leaves. In general, grey appearence of grey flue-curd tobacco seemed to be from less yellowish color, poorer brightness with more brownish or reddish color.

• Journal of the Korean Society of Clothing and Textiles
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• v.30 no.4 s.152
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• pp.507-518
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• 2006

This study aims to prove that traditional patchwork wrapping cloth can be a creative motive for modem fashion, and the application of it can be a way of expressing not only the pride in our cultural heritage but also the originality of fashion design. The analysis of the plasticity of 108 patchwork wrapping clothes has come up with the following findings: Firstly, the plane structure consists of 41 basic forms and 67 applied ones. Secondly, 61 contrast color harmony and 47 similarity color harmony. Thirdly, the fabric consists of 88 silk clothes, 19 ramie clothes, and 1 silk and ramie cloth. Fourthly, 47 unlined clothes and 61 lined ones. The study also expresses the analyzed plasticity of patchwork wrapping cloth for fashion with the following findings: Firstly, basic plane structures, contrast color harmony, silk cloth and the press flower coating technique become one piece dress to express splendid and elegant image. Secondly, application plane structures, similarity color harmony of natural dyeing method using persimmon, ramie cloth and the press flower coating and over lock technique become a jacket and a blouse to express calm and dynamic image. Thirdly, the needling and over lock technique used to patch clothes has become a desirable way to express fabric with unique surface effects. Fourthly, the press flower coating which modernizes embroidery in patchwork wrapping. cloth has become a new technique which can create high values with its extended the visual effects of the material. Fifthly, Patchwork wrapping cloth in Chosun Dynasty has now become a motive for modem fashion design to express tradition and creation.

• Archives of design research
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• v.16 no.1
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• pp.261-270
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• 2003

This paper focuses on the navigation methods which users select in different websites or for different tasks. Identifying the preferred navigation methods used for each case would help developers to construct the structure of website more effectively and confidently. To achieve the goal, this paper presents a framework on the classification of links as S_link and C_link. Then experiment is designed in order to evaluate the type of preferred link in each case. For the experiment, two different types of prototype websites such as news sites and shopping sites were constructed for which two different types of tasks such as goal-centered tasks and process-centered tasks were given to users. Particularly, to minimize the effects of visual elements and technical difference, prototype websites were produced with only HTML, not JavaScript nor Shockwave Flash. The result showed dearly that type of tasks had more significant effects on users navigation patterns than type of website. And users are more dependent on the S_link in the goal-centered task and on the C_link in the process-centered task. These findings were more apparent at the Qualitative test which was conducted for the comparative analysis between prototype site and real site.

• Journal of Engineering Education Research
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• v.11 no.2
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• pp.15-24
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• 2008

Teaching is communication between instructor and students. The learning outcomes can be enhanced by active learning of students. However, there are many obstacles to effective learning below, such as lecture notes authored by instructor, passive student participation, and paper-based homework. In this paper, we propose an effective method for enhancing learning effect through constructing learner ontologies in which knowledge discovered by students is conceptualized and organized. The learning ontology is composed of a teacher ontology and many learner ontologies. The learning ontology is used in discussion, visual presentation, and knowledge sharing between instructor and students. We used the learning ontology in two lectures in practice and learned that the learning ontology enhances learning effect through analysis of feedbacks of students.