• Structural Engineering and Mechanics
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• v.2 no.3
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• pp.295-309
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• 1994

The present paper concerns the mathematical study and the numerical treatment of the problem of semirigid connections in bolted steel column base plates by taking into account the possibility of appearance of separation phenomena on the contact surface under certain loading conditions. In order to obtain a convenient discrete form to simulate the structural behaviour of a steel column base plate, the continuous contact problem is first formulated as a variational inequality problem or, equivalently, as a quadratic programming problem. By applying an appropriate finite element scheme, the discrete problem is formulated as a quadratic optimization problem which expresses, from the standpoint of Mechanics, the principle of minimum potential energy of the semirigid connection at the state of equilibrium. For the numerical treatment of this problem, two effective and easy-to-use solution strategies based on quadratic optimization algorithms are proposed. This technique is illustrated by means of a numerical application.

• The Journal of the Korean dental association
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• v.54 no.6
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• pp.438-446
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• 2016

Severe tooth wear may cause the pathologic change of the TMJ and masticatory muscles, unesthetic facial appearance, pathogenic pulp and occlusal disharmony. Treating patients with severely worn dentition often requires full mouth rehabilitation with increasing vertical dimension. Proper diagnosis and treatment planning are important for esthetic and functional definitive restorations and the long term stability of the neuromuscular system and the TMJ. In this case, 66 year-old female presented with generalized worn dentition. Based on assessment, pathologic destruction of teeth structure on entire dentition was caused by masticatory force and diet habit without loss of vertical dimension. Subsequently, 3 mm increase of vertical dimension that based on incisor for tooth restoration and esthetic improvement was determined. After 8 weeks stabilization period with temporary fixed prostheses, definitive prostheses were fabricated. After 6 months follow up period, satisfactory outcomes were attained both functional and esthetic aspects through this procedure.

• Tuberculosis and Respiratory Diseases
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• v.55 no.4
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• pp.408-412
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• 2003

Pulmonary blastoma is a rare primary lung neoplasm composed of a mixture of immature mesenchyme and epithelium that morphologically mimics embryonal pulmonary structure. Microscopically, tumors could be divided into two classes; those composed solely of malignant glands of epithelial components (well-differentiated fetal adenocarcinoma) and those with biphasic appearance. A 51-year-old man was admitted with left sided pneumothorax. After closed thoracostomy, chest X-ray showed a circular mass in the left lower zone. The tumor was diagnosed as adenocarcinoma as a result of percutaneous needle aspiration biopsy, and left lower lobectomy was performed. The patient was diagnosed as having biphasic pulmonary blastoma on postoperative histological assessment. This case is the first reported patient with biphasic pulmonary blastoma detected by pneumothorax.

• Journal of the Korea Safety Management & Science
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• v.4 no.4
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• pp.97-108
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• 2002

This study deals with the application of knowledge-based engineering and a methodology for the assessment & measurement of reliability, availability, maintainability, and safety of industrial systems using fault-tree representation. A fuzzy methodology for fault-tree evaluation seems to be an alternative solution to overcome the drawbacks of the conventional approach. To improve the quality of results, the membership functions must be approximated based on heuristic considerations. Conventionally, it is not always easy to obtain a system reliability for components with different individual failure probability density functions(p.d.f.), We utilize fuzzy set theory to solve the adequacy of the conventional probability in accounting and processing of built-in uncertainties in the probabilistic data. The purpose of this study is to propose the framework of knowledge-based engineering through integrating the various sources of knowledge involved in a FTA.

• ETRI Journal
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• v.41 no.1
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• pp.42-51
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• 2019

The rainbow hologram provides views of reconstruction with rainbow color within a large viewing zone. In our recent paper, a Fourier rainbow holographic display using diffraction grating and a white-light LED source was introduced. In this technique, the rainbow effect is realized by the dispersion of white-light source on diffraction grating, while the slit is implemented numerically by reducing the demands of the space-bandwidth product of the display. This paper presents a novel analysis on the visual perception of the Fourier rainbow holographic display using Wigner distribution. The view-dependent appearance of the image, including multispectral field of view and viewing zone, is investigated considering the observer and the display parameters. The resolution of the holographic view is also investigated. For this, a new quantitative assessment for image blur is introduced using Wigner distribution analysis. The analysis is supported with numerical simulations and experimentally captured optical reconstructions for the holograms of the computer model and real object generated with different slit size, reconstruction distance, and different observation conditions.

• The korean journal of orthodontics
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• v.52 no.6
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• pp.439-450
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• 2022

This case report describes the treatment of an adult female patient with a history of periodontal disease, Class I malocclusion with extrusion, dental spaces, and pathologic tooth migration. The patient was treated with clear aligners, which effectively controlled the strength and direction of orthodontic forces after 3 months of systematic periodontal treatment. The Peer Assessment Rating (PAR) index was calculated from study models before and after treatment. The pretreatment PAR score was 24, and the posttreatment PAR score was 4. The PAR score for this patient changed by 83%. Satisfactory appearance and good function were achieved for this patient.

• Transactions of the Korean hydrogen and new energy society
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• v.33 no.6
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• pp.795-802
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• 2022

Korea is showing its appearance as a leading country in the hydrogen economy by establishing policies for revitalizing the hydrogen economy and enacting the 「Hydrogen Economy Promotion and Hydrogen Safety Management Act」 for the first time in the world. In addition, domestic hydrogen facilities are using hydrogen energy safely through world-class safety management compared to overseas advanced countries. However, in order to enhance the safety of the rapidly diversifying hydrogen industry and rapid technology development, such as the introduction of liquefied hydrogen, some institutional improvements are needed. In this regard, this paper intends to analyze the results of safety inspections on 13 representative facilities and prepare safety improvement plans to establish preemptive safety measures.

• Human Ecology Research
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• v.62 no.2
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• pp.295-302
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• 2024

This study analyzed the quality characteristics of nutritional bars with varying concentrations (0, 0.5, 1.5, 2.5%) of Enteromorpha intenstinalis powder added. To achieve this, color analysis, an assessment of DPPH radical scavenging activities, and sensory evaluations were performed. The results revealed that as the amount of Enteromorpha intestinalis powder (EIP) increased, pH and lightness values decreased. DPPH radical scavenging activities of 75.26%, 56.11%, 71.59%, and 62.49% were exhibited for the 0%, 0.5%, 1.5%, and 2.5% concentrations, respectively at 50 mg/mL. Significant differences were observed between the samples with respect to the color, appearance, texture, taste, and overall preference for the nutritional bars. Overall preference was highest for the nutritional bar with 1.5% Enteromorpha intenstinalis powder added. Therefore, adding 1.5% of Enteromorpha intenstinalis powder to a nutritional bar is most suitable for enhancing preference and quality characteristics.

• The Journal of Internal Korean Medicine
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• v.45 no.2
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• pp.259-269
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• 2024

This case report describe the effectiveness of combination treatment with Korean medicine for chronic functional constipation after lumbar interbody fusion. A female patient was treated for constipation lasting more than 6 months after surgery for lumbar disc herniation. For assessment, we used a NRS and Health-related Quality of Life Instrument with 8-Item Questionnaire (HINT-8). To assess changes in stool appearance, we used the Bristol Stool Scale. After 2 months of treatment, the NRS decreased from 8 to 1, the HINT-8 total score increased from 25 to 13, and the Bristol stool scale also improved. This case suggests that combined treatment with herbal medicine can improve symptoms of chronic constipation.

• Journal of the Korean Home Economics Association
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• v.44 no.11
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• pp.161-170
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• 2006

The purpose of this study was to research the perception and concern of university students with regard to well-being, and how these affected their assessment and satisfaction of university dormitory foodservice. Therefore, a survey was administered to 328 college students that use a dormitory foodservice. The results of the survey are as follows: First, the more positive the self-centered and society-centered values in relation to well-being, the greater both the concern and will to practice well-being through the eating well-being foods. Second, the attitude toward well-being food was positively correlated with the taste, amount, temperature, appearance and shape of dishes. Third, unlike the will to practice well-being through the eating well-being foods, the greater the concern about foods of well-being, the more positive was the effect on the general satisfaction with the foodservice. The greater the satisfaction with the attributes of a foodservice had a substantial influence on the general satisfaction with the foods. That is to say, the taste and type of dishes played a key role in the general satisfaction with the foods. Fourth, the concern in relation to foods of well-being had no measurable influence on the decisions with regards to the satisfaction of a foodservice or on the intention to reuse that foodservice. In addition, in relation to the degree of satisfaction with the attributes and use of a foodservice, the taste, type, appearance and shape of dishes had an important impact on the decisions to use and reuse a foodservice. Fifth, the general satisfaction with the meals served by a foodservice operation had a measurable influence on the satisfaction with, and intention to reuse that foodservice.