• Transactions of the Korean Society of Mechanical Engineers
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• v.16 no.2
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• pp.248-258
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• 1992

Three-dimensional rigid-plastic finite element formulation based on the membrane theory was described and a computer program for large deformation analysis was developed. In the formulation, normal and planar anisotropy of sheet material and rotation of the principal axes of anisotropy was taken into consideration. Sheet metal was assumed to be rigid-plastic material obeying Hill's quadratic yield criterion and its associated flow rule. Deep drawing process, as a preliminary test, for normal anisotropic material was analyzed in order to examine the validity of developed finite element program. The results were consistent with the existing finite element solutions or experimental data. The present study was mainly concerned with the influence of planar anisotropy on deformation behaviour. Finite element analysis and experiment were carried out for the whole process of deep drawing of planar anisotropic material. The computational and experimental results on the shape of ear, strain distribution and punch load were in good agreement.

• Korean Journal of Head & Neck Oncology
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• v.19 no.2
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• pp.137-141
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• 2003

Introduction: A routine superficial parotidectomy with facial nerve dissection in parotid tumor surgery often results in facial dysfunction, Frey syndrome and defect in operation site. Formal facial nerve dissection has been a recommended procedure, because pleomorphic adenoma is a commonly recurrent tumor in case of inadequate surgical management, however it can not be always reasonable in aspect of postoperative sequelae. Patients and Methods: Through retrospective review of 245 cases parotidectomies and follow up for more than three years, clinicophathologic factors influencing to the selection of surgical procedure were considered to be age, sex, and preoperative pathology confirmed by preoperative MRI and FNA. Results: Five categories were established as follow for surgical decision in parotid tumor surgery. Category 1. Superficial lobe adenoma -- Superficial parotidectomy -- 124 Category 2. Deep lobe adenoma -- Deep parotidectomy -- 39 Category 3. Non pleomorphic adenoma -- Tumorectomy 1.5cm adenoma in young female -- Tumorectomy -- 25 Category 4. Recurrent multicentric tumor -- Parotidectomy+RT -- 9 Category 5. Parotid cancer; Parotidectomy + UND (RND) + RT -- 48 ; CORE (Composite Regional Ear Resection) -- 2 Conclusion: Surgical morbidity and recurrence rate could be minimized by individualizing the surgical procedure according to the category principle based on the clincopathologic features.

• Journal of the Korean Home Economics Association
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• v.44 no.7 s.221
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• pp.99-111
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• 2006

This study was conducted to investigate children's emotional response, emotion regulation strategy, and emotion regulation effect (regulation effect of strategies), and to determine the relationships among emotion regulation strategy, emotion regulation effect and children's psychological well-being in anger, (ear, and disappointment situations. Emotion regulation strategy recomposed four strategies through factor analysis based on the children's direct answers to the question inquiring on the method used to regulate anger, fear, and disappointment. A total of 359 elementary school children in glades 5 or 6 selected one strategy use to regulate anger, fear, and disappointment. The effect of that selected strategy were estimated. Psychological well-being is evaluated by a questionnaire. The results of this study showed that most of elementary school children used the attention evocation strategy to regulate anger, fear, and disappointment, and this strategy was confirmed to be the most effective. Children's psychological well-being was associated with only emotion regulation effect in anger, fear, and disappointment situations.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.05a
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• pp.74-76
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• 2006

An external electrode fluorescent lamp (EEFL) has an advantage of a long lifetime in the ear1y stages of the study on plasma discharge, interest in the lamp continues. Researches on the operation of external electrode fluorescent lamps have focused mainly on its use of a type of high frequency (MHz). By performing high brightness using a square wave operation method with the low frequency below 100kHz, which is applied to a narrowed tube type lamp that has several mm of lamp diameter, EEFL presented the possibility of using it as a light source for back-lights. However, because EEFL generates plasma using wall charges, which considers the impedance characteristics of glass based on the structural principle in discharge, it can be significant1y affected by frequency. Thus, this study verified the change in the characteristics of electromagnetic fields according to the change in frequency through a Maxwell's electromagnetic field simulation and examined the relationship between the change in the EEFL frequency and brightness by measuring the optical characteristics. In addition, the characteristics of the transformation of energy orbits were verified by investigating the characteristics of the wavelength according to the change in frequency through the OES.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2003.05a
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• pp.125-129
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• 2003

The identification of location and strength distribution of extended noise sources is important in the practical noise control engineering, especially in the viewpoint of dealing with the inherent nature of noise problem in question. For noise source ranking inside an automotive vehicle, the window method has been mainly used due to its simplicity. However, time and cost drawbacks in the measurement and inaccuracy due to low-frequency tunneling and lack of phase information have been a serious problem in using this method. In this study, the inverse FRF method was employed to carry out the noise source ranking inside an automotive vehicle and it was also used to predict the interior sound pressure with the change of sound insulation materials. As a result, it was found that the source contribution of vehicle panels could be successfully identified in comparison with the window method. The sound pressure at driver's ear position was predicted based on the obtained data and was compared with the measured data. The agreement in spectral trends was acceptable and their difference in level was within 3㏈ above 500㎐.

• Archives of Craniofacial Surgery
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• v.15 no.2
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• pp.89-93
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• 2014

Background: To refine facial transplantation techniques and achieve sound results, it is essential to develop a suitable animal model. Rat is a small animal and has many advantages over other animals that have been used as transplantation models. The purpose of this study was to describe a rat hemifacial transplantation model and to verify its convenience and reproducibility. Methods: Animals used in this study were Lewis rats (recipients) and Lewis-Brown Norway rats (donors). Nine transplantations were performed, requiring 18 animals. The hemifacial flap that included the ipsilateral ear was harvested based on the unilateral common carotid artery and external jugular vein and was transferred as a single unit. Cyclosporine A therapy was initiated 24 hours after transplantation and lasted for 2 weeks. Signs of rejection responses were evaluated daily. Results: The mean transplantation time was 1 hour 20 minutes. The anatomy of common carotid artery and external jugular vein was consistent, and the vessel size was appropriate for anastomosis. Six of nine allografts remained good viable without vascular problems at the conclusion of study (postoperative 2 weeks). Conclusion: The rat hemifacial transplantation model is suitable as a standard transplantation training model.

• Korean Journal of Occupational Health Nursing
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• v.19 no.1
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• pp.14-27
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• 2010

Purpose: The purpose of this study was to identify health promoting behaviors and health problems in contact center consultants, and to provide basic data in order to develop health promoting interventions for these people. The subjects were 680 consultants randomly selected from 6 contact centers out of 31 in D city. The data were collected from March 20, to March 28, 2008. Methods: The tools for this study were HPLP II developed by Walker et al. (1995) that was modified and translated by Park (2005) and modified CMI for contact center consultants based on CMI developed by Bordman (1994). The data were analyzed by descriptive statistics, t test, ANOVA, and Scheffe test with the SPSS WIN 14.0 program. Results and Conclusion: The contact center consultants' health promoting behavior was in a low level and they had certain health problems related to their job such as eye, ear and throat. In consideration of contact center consultants' job characteristics, health education should be provided with the development of systematic health programs.

• The Journal of the Society of Korean Medicine Diagnostics
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• v.14 no.2
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• pp.25-42
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• 2010

Background and purpose: The chronic diseases caused by lifestyle are on the increase. This study aims to review the eating habits as etiological factors and related symptoms from the perspective of Korean medicine. In this process, we will make a proposal on the treatment of the lifestyle related diseases. Methods: We studied the sentences about the eating habits and related diseases in Donguibogam Results and Conclusions: 1. The eating habits as etiological factors are overeating, irregular eating, late-night foods, fatty & heavy foods, cold foods, alcohols, etc. 2. The diseases caused by the eating habits are not limited to the gastrointestinal diseases(stomachache, vomiting, diarrhea, etc) but include the non-gastrointestinal diseases(edema, arthralgia, anal diseases, eye diseases, ear diseases, diabetes, cancers, etc.) 3. In the treatment of the diseases caused by the eating habits, the special regard should be paid to the etiological factors.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.37-37
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• 2003

Rice is one of the most important crop in the world and is a major export of Thailand. Optical sensors are not useful for rice monitoring, because most cultivated areas are often obscured by cloud during the growing period, especially in South East Asia. Spaceborne Synthetic Aperture Radar (SAR) such as RADARSAT, can see through regardless of weather condition which make it possible to monitor rice growth and to retrieve rice acreage, using the unique temporal signature of rice fields. This paper presents the result of a study of examining the backscatter behavior of rice using multi-temporal RADARSAT dataset. Ground measurements of paddy parameters and water and soil condition were collected. The ground truth information was also used to identify mature rice crops, orchard, road, residence, and aquaculture ponds. Land use class distributions from the RADARSAT image were analyzed. Comparison of the mean DB of each land use class indicated significant differences. Schematic representation of temporal backscatter of rice crop were plotted. Based on the study carried out in Pathum Thani Province test site, the results showed variation of sigma naught from first tillering vegatative phase until ripenning phase. It is suggested that at least, three radar data acquisitions taken at 3 stages of rice growth circle namely; those are at the beginning of rice growth when the field is still covered with water, in the ear differentiation period, and at the beginning of the harvest season, are required for rice monitoring. This pilot project was an experimental one aiming at future operational rice monitoring and potential yield predicttion.

• Archives of Plastic Surgery
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• v.46 no.2
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• pp.102-107
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• 2019

Mobile computing devices (MCDs), such as smartphones and tablets, are revolutionizing medical practice. These devices are almost universally available and offer a multitude of capabilities, including online features, streaming capabilities, high-quality cameras, and numerous applications. Within the surgical field, MCDs are increasingly being used for simulations. Microsurgery is an expanding field of surgery that presents unique challenges to both trainees and trainers. Simulation-based training and assessment in microsurgery currently play an integral role in the preparation of trainee surgeons in a safe and informative environment. MCDs address these challenges in a novel way by providing valuable adjuncts to microsurgical training, assessment, and clinical practice through low-cost, effective, and widely accessible solutions. Herein, we present a review of the capabilities, accessibility, and relevance of MCDs for technical skills acquisition, training, and clinical microsurgery practice, and consider the possibility of their wider use in the future of microsurgical training and education.