• Korean Journal of Head & Neck Oncology
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• v.34 no.1
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• pp.37-39
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• 2018

Tongue osteoma is a rare disease. Clinically, it occurs mainly in the posterior part of the tongue and may cause foreign body sensation, but most of it is found incidentally without any symptom. Clear mechanisms of development have not yet been established, but many hypotheses have been proposed. Treatment is possible with surgical resection and no recurrence or malignancy has been reported. We experienced a 29 year old man with osteoma of tongue. We report this case with a review of literature.

• Journal of the East Asian Society of Dietary Life
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• v.25 no.5
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• pp.752-764
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• 2015

The main objective of this study was to investigate how Jongga and its cuisine is perceived by Koreans and foreign tourists and develop Jongga culinary culture for culinary tourism. Chungjae Jongga was chosen since it is one of the most famous Jongga in South Korea. In-depth personal interviews were performed with Koreans and foreign tourists. Interviews were performed to provide deeper insights into comments and subject matters. Most tourists selected "having lunch at Jongga" as the most distinctive part of the tour. To develop the experience at Jongga as a culinary destination, questionnaires were created to study eight areas: satisfaction, expectations as a tourist at Jongga, most impressive part of tour, preference of food serving style, length of stay, price range, things to be improved, and role of food guide. This study will help Jongga to improve food as a culinary tourist's attraction and ultimately heighten the value of Jongga. Perceptions toward Jongga and its cuisine were generally positive, but the quality of service and lack of organization in establishments were perceived to be negative factors.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.1
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• pp.73-79
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• 2016

In this paper a cervical rehabilitation robot for Mckenzie exercises to be effective to neck pain relief is proposed. The robot has two degrees of freedom (DOF) for Lateral flexion and extension, Dorsal and Vental flexion which enable user to perform cervical stretching and isometric exercises for neck muscles. The mechanical parts of the cervical rehabilitation robot can be mounted on a back- or head-rest of chair, and user can perform the Mckenzie exercise with seated. In experiments we measured the range of motion of cervical part, EMG signals from neck muscles and the contact forces of a head bracket fixing the head part of user, and then evaluated their performances. From the experimental results, we showed a feasibility of the cervical rehabilitation robot proposed in this study.

• Journal of the Korean Society of Radiology
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• v.11 no.3
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• pp.139-146
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• 2017

At the Brain MRI examination, RF Pulse are irradiated on the human head in order to acquire MR images. At this time, a considerable part of the irradiated RF Pulse energy is absorbed in our body and the temperature of the human head will rise depending on the degree of exposure, so it will affect the human head. Even if the same RF Pulse energy is given, if the metal is inserted in the human head, the conductivity of the human head is greatly increased by the metal, so the SAR value increases and the temperature also rises. Therefore, we started this research with the question as to whether there is difference between the change in SAR value and temperature displayed on the head of the human according to use or not of the dental implant. Experiments were using the XFDTD program on a 128 MHz RF Pulse frequency by a 3.0 tesla MRI. We can see that both are increasing that the average value of SAR and temperature that absorbed by the human head model used the dental implant. In addition, the average maximum SAR value and the maximum temperature rise in the brain part are shown below the international safety standard value but the influence can not be ignored because of the result may change according to the increase in the number of dental implant. And as future tasks. we need to the simulation of temperature rise and SAR due to an increase in the number of implants and volumes of teeth, dental implant material.

• Korean Journal of Otorhinolaryngology-Head and Neck Surgery
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• v.61 no.12
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• pp.710-713
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• 2018

A congenital cholesteatoma is a benign mass formed from the keratinizing stratified squamous epithelium. It usually occurs in young children's anterosuperior part of the middle ear. A congenital cholesteatoma which originates from mastoid temporal bone or expands to posterior cranial fossa is rare. Standard treatment of an intracranial cholesteatoma is surgical removal with craniotomy. A 69-year-old woman was diagnosed with a congenital cholesteatoma of mastoid temporal bone that expanded to the posterior cranial fossa, which was successfully treated with transmastoid marsupialization without craniotomy. This is a first documented case of a congenital cholesteatoma of mastoid temporal bone that expanded to posterior cranial fossa, which was successfully treated with transmastoid marsupialization without craniotomy.

• Transactions of the Korean Society of Automotive Engineers
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• v.4 no.5
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• pp.187-196
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• 1996

In this study, 3-dimensional finite element model of a diesel engine cylinder head was made to accomplish heat transfer analysis and also thermal stress and deformation analysis. Heat release analysis and Nusselt-Reynolds correlations were applied to determine the convective boundary conditions which are required for heat transfer analysis to calculate temperature distribution. Thermal stress distribution was also investigated from heat transfer analysis results. Steady state temperature and heat flux were measured by using K-type thermocouples and then compared with numerical results to give a guarantee for the propriety of numerical analyses.

• Journal of information and communication convergence engineering
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• v.10 no.4
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• pp.384-389
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• 2012

In this paper, we examine the problems of the low energy adaptive clustering hierarchy (LEACH) protocol and present ideas for improvement by selecting the cluster head node. The main problem with LEACH lies in the random selection of cluster heads. There exists a probability that the formed cluster heads are unbalanced and may remain in one part of the network, which makes some part of the network unreachable. In this paper, we present a new version of the LEACH protocol called the improved LEACH (ILEACH) protocol, which a cluster head is selected based on its ratio between the current energy level and an initial energy level, and multiplies by the root square of its number of neighbor nodes. The simulation results show that the proposed ILEACH increases the energy efficiency and network lifetime.

• 유체기계공업학회:학술대회논문집
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• 2006.08a
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• pp.341-344
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• 2006

In this analytical study on the engine coolant flow of a heavy-duty diesel engine with 4 valves and linear-type 8 liter 6 cylinders, the characteristics of pressure drop and engine cooling performance with the additional coolant passages between cylinder blocks have been investigated. Since the most part of pressure drop is caused by the coolant flow passages inside a cylinder head and cylinder blocks for this type of heavy-duty diesel engines, the advantage of pressure drop is just 2.6% and the characteristics of heat transfer and the distribution of coolant velocities in the head part show little differences in case of additional coolant passages. Thus the coolant flow passages between cylinder blocks make little contribution on the cooling performance of heavy-duty diesel engines

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.1349-1354
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• 2008

In this study, we try to find the root cause of water condensing failures in a headlamp using chemical and mechanical analysis. Through the surface inspection by OM, SEM and CT, it was found that water infiltrate into the headlamp through hotmelt adhesive debonding part caused by adhesion force degradation and poor quality. IR spectra shows that adhesion force degradation are characterized by increase of some functional group(1742, 1710, 1649, 1016). Through the ESPI measurement, it is turned out that bonding structural change by thermal expansion and degradation of adhesive can be the cause of void generation. So it is recommended that cooling passage and the bonding part should be redesigned to give a guarantee of less thermal stress and high adhesion quality.

• Journal of Korean Academy of Nursing
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• v.8 no.2
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• pp.1-13
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• 1978

Evaluation for students’performance is a very important and difficult responsibility of head nurses. This study was undertaken to investigate and identify head nurses’attitudes toward evaluation for clinical performance of nursing students. Data were gathered through questionnaire from eighty eight head nurses at three hospitals in Kwang Ju City and four hospitals in Seoul, during the period of April 9th-26th, 1978. The questionnaire developed by the researcher included 19 statements which concerned the attitudes of head nurses: their perception about objectives of evaluation for the students clinical performance, their attitudes toward responsibility as evaluator, their attitudes toward method of evaluation, their understanding and interest in nursing students. Mean attitude score more than 60% were classified as positive or favorable, and less than 60% to be negative or unfavorable. The result obtained could be summerized as follows: 1. The mean score of head nurses’attitudes was positive (67.9%). Hypothesis I was rejected, 2. Head nurses’perception about objectives on performance evaluation was very favorable (85.5%). 3. Head nurses’attitudes toward evaluating method were negative (50.9%), post-evaluation interview were perceived to be a part of evaluating process (73.9%), although only few (22.7%) implemented. 4. The head nurses’attitudes in the responsibility as a evaluator were unfavorable (58.2%). 5. Relatively favorable response was revealed in understanding and interest about nursing students (79.6%). 6. Educational level, duration of clinical experience, marital status, and geographical region of head nurses were no significant influence on the attitudes toward evaluation for clinical performance (P > 0.05), while only age revealed significant difference (P < 0.05) Hypothesis 2, 3, 5 and 6 were accepted, hypothesis 4 was rejected.