• Journal of the Korean Society for Aviation and Aeronautics
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• v.26 no.2
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• pp.76-82
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• 2018

A test simulator is needed to develop a fuel quantity measurement system that takes into account the roll and pitch motion of the aircraft. In this paper, we develop a test simulator that consists of attitude simulation equipment, fueling equipment, and data storage equipment. The attitude simulation equipment simulates the aircraft attitude. It is manufactured to operate pitch angle and roll angle movement. The fueling equipment supplies fuel to the supplementary fuel tank. The data storage equipment collects and stores the measured data. We also develop an automation software that operates the test simulator and collects data automatically. The test simulator has been automated to prevent testers from being exposed to toxic fuel. Through automation software, the collection period is reduced by one quarter compared to manual collection. The developed fuel quantity measurement system is verified through the test simulator.

• Proceedings of the KSME Conference
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• 2008.11a
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• pp.396-401
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• 2008

The disc-pad brake system is an important part of automobile safety system. During braking, the kinetic energy and potential energies of a moving vehicle are converted into the thermal energy through frictional heat between the brake disc and the pads. Most of the thermal energy dissipated through the brake disc. The temperature could be exceed the critical value for a given material, which leads to undesirable effects, such as the brake fade, premature wear, brake fluid vaporization, bearing failure, thermal cracks, and thermallyexcited vibration. The object of the present study is to investigate temperature field and temperature variation of brake disc and pad during single brake. The brake disc is decelerated at the initial speed with constant acceleration, until the disc comes to stop. The pad-disc brake assembly is built by 3D model with the appropriate boundary condition. In the simulation process, the mechanical loads are applied to the thermomechanical coupling analysis in order to simulate the process of heat produced by friction.

• Journal of Physiology & Pathology in Korean Medicine
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• v.25 no.4
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• pp.708-714
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• 2011

This study was aimed to review the trend of case reports of neuropsychiatry disease. The case reports were collected by retrieving Journal of Oriental Neuropsychiatry and analyzing period were from 1990 to 2010. We analyzed them for publish year, research institution, patients, sorts of diseases, pattern identification diagnosis, instrument, treatment period, sorts of treatments, and treatment with western medicine. We analyzed 142 case reports and there were many kinds of neuropsychiatry diseases and instruments that were evaluated the process. The reserchers used various treatment with oriental medicine. However, the number of case reports have decreased since the year of 2008. Most of the research institutions were university and general oriental medical hospital and the portion of private hospitals was only 2.11%. For the development of practical clinical trial of oriental medicine, we needs more qualifying case report. We hope more reserchers for psychiatry disease of oriental medicine will be interested in the publication of case report and this will serve to produce advance of oriental medicine.

• Korean Journal of Oriental Medicine
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• v.17 no.2
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• pp.39-46
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• 2011

Objectives : This study was aimed to review the trend of dementia clinical studies in Korean Oriental Medicine and to suggest better clinical studies. Method : We collected 26 papers on dementia clinical studies in the internet site OASIS using the keyword 'Dementia'. Then we analyzed them. Results : There were 26 clinical study papers that were published between 1996 and 2010. Observational studies account for 61% of total clinical studies, whereas experimental studies account for only 31%. Effects of treatment in experimental studies was evaluated mainly by MMSE-K and K-DRS. Treatment period of experimental studies was longer than 100days. Conclusions : High quality experimental studies like randomized clinical trial(RCT) and intervention studies which use syndrome differentiation(辨證) have not yet been published. It is necessary to research and develop duration of treatment effect and tools for evaluating treatment effects.

• Journal of Oriental Neuropsychiatry
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• v.22 no.3
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• pp.1-11
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• 2011

Objectives : As the number of patient with dementia increases, interest in mild cognitive impairment (MCI), which is a pre-dementia stage, has been expanding. In this study, we investigated the effects from selected clinical research articles to evaluate the effectiveness of non-pharmacological interventions. Methods : We searched MCI related articles on MEDLINE and the Web of Science using keywords related to MCI. We selected 26 articles, and 13 evaluated efficiency using the Jadad score. Results : Physical exercise and cognitive remediation techniques were effective for improving MCI. Transcutaneous electrical nerve stimulation, taichi, and music belonged to "perhaps" effectiveness group. Many of the 13 articles that evaluated MCI using the Jadad score evaluated them as "good" or "poor", and only three articles evaluated MCI as "excellent". Conclusions : The present evidence suggests that cognitive remediation techniques to improve memory and physical exercise were effective for people with MCI. However, further studies are needed to identify the physical exercise effects.

• Journal of the Korean Society of Radiology
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• v.83 no.5
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• pp.1141-1146
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• 2022

Extraskeletal osteochondroma, a variant of chondroma, typically arises in the para-articular location of hands and feet. It is a rare disease and is particularly uncommon when joint components are not involved or localized away from joints. Herein, we report a case of extraskeletal osteochondroma in the posterior neck of a 66-year-old female. The characteristic radiologic finding of our case is presented, along with the typical findings of the disease and review of related literature reports.

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.139-139
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• 2012

With angle resolved photoemission spectroscopy (ARPES), the surface electronic band structures of Pt3Co (111) and Pt3Ni (111) single crystals are investigated, which allow to study the bonding interaction between chemically absorbed atomic oxygen and its surfaces. The d-band electrons of subsurface TM are separated from the direct chemical bonding with atomic oxygen. That is, the TM does not contribute to direct chemical bonding with oxygen. From the density functional theory (DFT) calculations, it is identified that the main origin of improved oxygen absorption property, i.e. softening of Pt-O bonding, is due to the suppression of Pt surface-states which is generated from change of interlayer potential, i.e. charge polarization, between Pt-top and TM-subsurface. Our results point out the critical roles of subsurface TM in modifying surface electronic structures, which in turn can be utilized to tune surface chemical properties.

• Journal of the Korean Geosynthetics Society
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• v.15 no.4
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• pp.79-88
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• 2016

A derelict bridge called WoljungGyo is being restored in Gyeongju, the capital city of ancient Silla. WoljungGyo was originally built in 760AD, and later rebuilt in 1280AD during the Goryeo Kingdom. The bridge lasted in working condition for at least 520 years. The bridge was uncovered to the remains of both abutments and four piers, with only one or two steps remaining. The provenance of the WoljungGyo stone relics was investigated to decide the type of stone for the restoration works. Field survey were carried out in the whole area of Gyeongju-Si with petrological investigation for the stone relics. Results of the study present that Namsan granite was used in those days for building of the WoljungGyo. It is seems that the used stones were obtained from tor or core stone around the Tongil-jeon and Tap-gok area in the east side of Mt. Namsan.

• Radiation Oncology Journal
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• v.30 no.1
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• pp.36-42
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• 2012

Purpose: To evaluate the radial displacement of clinical target volume in the patients with node negative head and neck (H&N) cancer and to quantify the relative positional changes compared to that of normal healthy volunteers. Materials and Methods: Three node-negative H&N cancer patients and five healthy volunteers were enrolled in this study. For setup accuracy, neck thermoplastic masks and laser alignment were used in each of the acquired computed tomography (CT) images. Both groups had total three sequential CT images in every two weeks. The lymph node (LN) level of the neck was delineated based on the Radiation Therapy Oncology Group (RTOG) consensus guideline by one physician. We use the second cervical vertebra body as a reference point to match each CT image set. Each of the sequential CT images and delineated neck LN levels were fused with the primary image, then maximal radial displacement was measured at 1.5 cm intervals from skull base (SB) to caudal margin of LN level V, and the volume differences at each node level were quantified. Results: The mean radial displacements were 2.26 (${\pm}1.03$) mm in the control group and 3.05 (${\pm}1.97$) in the H&N cancer patients. There was a statistically significant difference between the groups in terms of the mean radial displacement (p = 0.03). In addition, the mean radial displacement increased with the distance from SB. As for the mean volume differences, there was no statistical significance between the two groups. Conclusion: This study suggests that a more generous radial margin should be applied to the lower part of the neck LN for better clinical target coverage and dose delivery.

• Journal of Oriental Neuropsychiatry
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• v.22 no.3
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• pp.115-125
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• 2011

Objectives : This study was aimed to review the trend of clinical studies in Journal of Oriental Neuropsychiatry since 2001 to 2010. Methods : We collected 260 clinical studies and analyzed them for publish year, sorts of disease or symptoms, pattern identification diagnosis, and classification of clinical studies. Among them, we selected 46 clinical experimental studies and these studies were further analyzed for publish year, research institution, sort of disease or symptoms, sorts of treatments, number of subject, and pattern identification diagnosis. Results : The number of clinical studies in Journal of Oriental Neuropsychiatry have increased since the year of 2001. There were 62 kinds of diseases and symptoms and Hwa-Byung had the highest number of studies followed by depression, headache, insomnia and so on. The clinical experimental studies, which took up 17% of the clinical studies, have increased since 2001 and was varied with year. There were 13 reserch institutions for clinical experimental studies and they studied about stress, dementia, Hwa-Byung, and so on. Most of studies researched treatment about acupuncture, herb medicine, and meditation treatment for persons under 144. There are only 22% of studies using pattern identification diagnosis. Conclusions : For the development of oriental medicine for psychiatric disease, we need more qualifying clinical studies like RCT. We hope more researchers for psychiatry disease of oriental medicine will be interested in the publication of clinical studies and this will serve to produce advance of oriental medicine as evidence based medecine.