• Journal of the Korean Academy of Esthetic Dentistry
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• v.27 no.1
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• pp.4-17
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• 2018

Extraction of highly injured teeth in the maxillary anterior teeth and implants restoration is almost good choice, lastly, you tried to save highly injured teeth is a good choice if you have a trust relationship between the dentist and the patient. If the dentist and the patient work together to achieve long-term maintenance, they will create a thicker trust relationship.

• Proceedings of the Korean Society of Applied Pharmacology
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• 1995.04a
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• pp.115-115
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• 1995

저자 등은 일련의 식물엑스에 대하여 항위염 및 항궤양효능에 관한 검색을 실시하여 오리나무수피의 MeOH엑스가 현저한 효과가 있음을 예지 하였으므로 그에 대하여 보다 구체적인 실험을 실시하였다. 즉 MeOH엑스를 Hexane, CMCl$_3$, BuOH로 계통적으로 추출하여 상기의 분획 및 잔사인 물분획을 제조하여 이에 대한 실험을 실시하였다. 소화성궤양이 공격인자와 방어인자의 불균형에 의해 형성됨을 Shay가 주장함으로써 공격인자의 억제를 알아보기 위한 Mizui 등의 방법인 HClㆍEtOH 유발 위손상 실험과 Guth 등의 Aspirin 위손상 실험 방법에 따라서 위 손상정표를 관찰하였다. Shay의 방법에 따라서 위궤양 모텔은 유문을 결찰하고 검체를 십이지장내에 투여하고 처치를 완료하고 12시간 후에 궤양정도와 또한 4시간의 유문결찰에 의한 위액분 비량, pH 및 산분비량에 미치는 영향을 관찰하였다. 또 염산과 pepsin 등에 의한 점막 손상에 대한 방어인자의 증강요인인 위 mucous membrane의 mucus분비를 알아보기 위한 absoluteㆍ에탄올 위손상에 대한 예방효과 시험을 시행하였다. 이 실험의 결과, 오리나무 MeOH엑스의 항위염 및 항위궤양효과는 BuOH 분획에서 강력한 작용이 있었으며 이 분획은 aspirin 유발 위손상 및 shay 궤양에 효과를 나타내었고 또한 mucin량의 증가를 보여주었다. 그러나 이 분획은 위액, pH 및 산분비량에 영향을 나타내지 아니하였다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.40 no.8
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• pp.721-724
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• 2016

Because of the inherent uncertainties caused by the manufacturing process variations, future loading conditions, and incomplete damage models, the lifetimes of mechanical structures under field conditions are significantly different from the results obtained in the laboratories. In this study, a dual sensor was developed to prognosticate the fatigue failure of structures under these uncertain conditions, and its effectiveness was demonstrated on a rectangular columnar structure under repeated uni-axial loading. The dual sensor is a slightly weaker structure embedded in the target structure, so that failure occurs in the sensor earlier than in the target structure. From the signal differences in the strain gauges in the embedded dual sensor, it is possible to differentiate between the normal status and warning status, even under variable loads.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.756-757
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• 2011

보호장치는 전력계통에 고장이 발생할 경우 신속 정확 하게 고장을 검출하여 고장부분을 계통으로부터 분리시킴으로써 각종 설비의 손상을 막고 정전구간을 최소화 하여 계통의 안정화를 향상시키는 장치이다. 현재 한전 및 발전사 뿐만아니라 수자원공사의 수도사업장에서도는 원격감시 제어를 통한 무인화와 함께 디지털보호계전기가 설치 운영되고 있다. 디지털 보호계전기는 기존의 기계식 보호계전기가 수행하는 보호기능보다 우수한 성능이 입증되었으며 최근 반도체 기술의 비약적 발전과 보호 알고리즘의 지속적인 개발로 보호계전기의 디지털화가 가속되고 있고 더욱 개선된 고성능, 다기능의 보호계전기 또는 IED가 산업현장에 적용되는 추세에 있다. 본 논문에서는 과전압 보호계전기와 부족전압 보호계전기의 기능 및 동작특성에 대하여 연구하였다.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.16 no.6
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• pp.533-539
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• 2023

This study aimed to analyze patients hospitalized for injuries who fell using the data from 2020 to 2021 at institution A located in Gangneung-si, Gangwon-do, using codes for causes of injury. After classifying 20 codes from W00 to W19, which are external cause codes for fall patients, the most frequently occurring W18, W01, W10, and W13 were analyzed. The external cause of injury code W18 was other falls on the same plane, with the highest frequency of S72 and Z47, S72 being a fracture of the femur, and Z47 being orthopedic follow-up treatment. The external injury code W01 was determined to be a fall on the same plane due to slipping, tripping, and tripping, and like W18, S72, a fracture of the femur, and Z47, orthopedic follow-up treatment, were frequently reported. In W10, intracranial injuries such as concussion and epidural hemorrhage due to a fall on the stairs, S06, were common. Lastly, in W13, 91% of cases occurred in people in their 40s to 70s due to falls from buildings or structures, confirming that they occur frequently in middle-aged people, Z47 had the most frequent orthopedic follow-up treatment, and S72 had a fracture of the femur. It was found to be the second most common. In this way, the frequency of falling patients was analyzed, and the age and main diagnosis code at which most falls occurred were analyzed.

• Journal of Aerospace System Engineering
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• v.13 no.6
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• pp.17-25
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• 2019

PHM (Prognostics and Health Management) of aircraft engines is applied to predict the remaining useful life before failure or the lifetime limit. There are two methods to establish a predictive model for this: The physics-based method and the data-driven method. The physics-based method is more accurate and requires less data, but its application is limited because there are few models available. In this study, the data-driven method is applied, in which a multi-layer perceptron based neural network algorithms is applied for the life prediction. The neural network is trained using the data sets virtually made by the C-MAPSS code developed by NASA. After training the model, it is applied to the test data sets, in which the confidence interval of the remaining useful life is predicted and validated by the actual value. The performance of proposed method is compared with previous studies, and the favorable accuracy is found.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.16 no.6
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• pp.526-532
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• 2023

Falls are fatal accidents that occur more than 420,000 times a year worldwide. Therefore, to study patients with falls, we found the association between extrinsic injury codes and principal diagnosis S-codes of patients with falls, and developed a prediction model to predict extrinsic injury codes based on the data of principal diagnosis S-codes of patients with falls. In this study, we received two years of data from 2020 and 2021 from Institution A, located in Gangneung City, Gangwon Special Self-Governing Province, and extracted only the data from W00 to W19 of the extrinsic injury codes related to falls, and developed a prediction model using W01, W10, W13, and W18 of the extrinsic injury codes of falls, which had enough principal diagnosis S-codes to develop a prediction model. 80% of the data were categorized as training data and 20% as testing data. The model was developed using MLP (Multi-Layer Perceptron) with 6 variables (gender, age, principal diagnosis S-code, surgery, hospitalization, and alcohol consumption) in the input layer, 2 hidden layers with 64 nodes, and an output layer with 4 nodes for W01, W10, W13, and W18 exogenous damage codes using the softmax activation function. As a result of the training, the first training had an accuracy of 31.2%, but the 30th training had an accuracy of 87.5%, which confirmed the association between the fall extrinsic code and the main diagnosis S code of the fall patient.

• The Journal of Korean Academy of Prosthodontics
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• v.57 no.1
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• pp.75-80
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• 2019

Fall is the most common cause of trauma in the elderly and a major reason of dental injury. Maxillary anterior region is the most vulnerable area to the traumatic fall. Loss of teeth and adjacent tissue in this area results in maxillofacial defects and inappropriate maxillomandibular relationship. Reconstruction of the loss requires comprehensive and careful planning to fulfill not only functional but also esthetic demand. Prosthetic approach can avoid surgically extensive intervention, reducing both treatment cost and time. This clinical report describes a 78-year-old woman with the loss of teeth and alveolar bone in maxillary anterior region due to a traumatic fall, rehabilitated with a metal-ceramic fixed dental prosthesis using gingival porcelain.

• Journal of the Korean Society of Propulsion Engineers
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• v.18 no.6
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• pp.50-58
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• 2014

This paper is about a short survey on the recent research activities regarding health monitoring and management for liquid rocket engines. For this, we investigate the precedent techniques developed in advanced space-industry countries which are USA, EU, Russia, Japan and China. Particularly, we focus on the technologies applied in China, a recently joined to the advanced space-industry countries in this field. Then we discuss some important points to be considered to apply to the development of the Korea Space Launch Vehicle KSLV-II and other related projects.

• Corrosion Science and Technology
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• v.21 no.4
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• pp.282-289
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• 2022

Aluminum 1000 series alloy, a pure aluminum with excellent workability and weldability, is mainly used in the ship field. Aluminum alloy can combine with oxygen in the atmosphere and form a natural oxide film with high corrosion resistance. However, its corrosion resistance and durability are decreased when it is exposed to a harsh environment for a long period of time. For solving this problem, a porous oxide film can be formed on the surface using an anodizing treatment method, a typical surface technique among various methods. In this study, aluminum 1050 alloy was anodized for 2 minutes, 6 minutes, and 10 minutes. The structure and shape of the oxide film were then analyzed to determine the corrosion resistance according to the thickness of the oxide film that changed depending on working condition using 15 wt% NaCl. After it was immersed in NaCl solution for 1, 5, and 10 days, corrosion damage was observed. Results confirmed that the thickness of the oxide film increased as the anodization time became longer. The depth of surface damage due to corrosion became deeper when the film was immersed in the 15 wt% NaCl solution for a longer period of time.