• Journal of dental hygiene science
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• v.23 no.4
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• pp.378-388
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• 2023

Background: With increasing interest in health in old age, aspects of oral aging are being considered. The Korean Academy of Geriatric Dentistry recently proposed the diagnostic criteria for oral frailty in older adults in Korea. This study aimed to conduct a cross-sectional survey of factors related to oral frailty among community-dwelling older adults and identify differences in oral frailty status according to age and sex. Methods: Among 217 older adults aged ≥60 years who visited a senior center in Wonju, 206 completed all tests for oral frailty. Among them, data from those with a Korean Version of the Modified Barthel Index score ≥90 were used in the final analysis. After evaluating oral frailty diagnostic factors such as chewing ability, occlusal force, tongue pressure, oral dryness, oral cleanliness, and swallowing function, oral hypofunction was determined according to the oral frailty diagnostic criteria. Subsequently, the evaluation results were compared based on sex and age. Results: Significant differences in chewing ability, maximum occlusal pressure, and maximum tongue pressure were observed between sexes. However, these differences did not affect oral frailty diagnosis. All diagnostic factors of oral frailty, except for the risk of oral dryness and swallowing dysfunction, showed significant differences with age. However, no significant difference was observed in the prevalence of oral frailty. Additionally, this study found no relationship between sex and oral frailty factors using the oral frailty diagnostic criteria. However, it also found that age plays a significant role as an oral frailty diagnostic indicator, in addition to oral dryness and swallowing function. Conclusion: Sex and age did not affect oral frailty diagnosis. However, patients' chewing ability, occlusal force, and tongue pressure were affected by sex and age. Therefore, sex and age should be considered when diagnosing and intervening in oral frailty in the future.

• Journal of the Semiconductor & Display Technology
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• v.22 no.4
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• pp.113-118
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• 2023

Maintenance of semiconductor equipment processes is crucial for the continuous growth of the semiconductor market. The process must always be upheld in optimal condition to ensure a smooth supply of numerous parts. Additionally, it is imperative to monitor the status of the robots that play a central role in the process. Just as many senses of organs judge a person's body condition, robots also have numerous sensors that play a role, and like human joints, they can detect the condition first in the joints, which are the driving parts of the robot. Therefore, a normal state test bed and an abnormal state test bed using an aging reducer were constructed by simulating the joint, which is the driving part of the robot. Various sensors such as vibration, torque, encoder, and temperature were attached to accurately diagnose the robot's failure, and the test bed was built with an integrated system to collect and control data simultaneously in real-time. After configuring the user screen and building a database based on the collected data, the characteristic values of normal and abnormal data were analyzed, and machine learning was performed using the KNN (K-Nearest Neighbors) machine learning algorithm. This approach yielded an impressive 94% accuracy in failure diagnosis, underscoring the reliability of both the test bed and the data it produced.

• Journal of Digital Policy
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• v.3 no.4
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• pp.27-33
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• 2024

The study aims to enhance the early diagnosis rate of dementia patients due to the increasing elderly population by developing an Android-based dementia diagnostic testing app. The research methodology involved designing the app based on the LICA (Lee's Instrument for Cognitive Assessment) for the elderly, providing users with an intuitive interface and incorporating voice recognition features to ensure usability for illiterate individuals. The app transmits user responses to a Flask server for immediate grading and feedback. The analysis results indicate that the developed app offers a convenient LICA testing environment, allowing the elderly to easily assess their risk of dementia. This research enhances the accessibility of early dementia diagnosis and suggests future studies to integrate various cognitive testing methods and improve app functionalities. Such contributions are expected to play a significant role in the advancement of dementia prevention and management systems.

• Journal of radiological science and technology
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• v.30 no.4
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• pp.407-417
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• 2007

The purpose of this study is to determine whether change of the lumbar intervertebral disc diameters and size is a risk factor for development of lumbar disc lesion and this changes are associated with aging. The L4-5 and L5-S1 intervertebral disc diameters and size were measured in 50 normal subjects and 50 low back pain patients in the age range $20{\sim}60$ by MRI. The data were analysed with independent t-test to differentiation between normal subjects and low back patients. We also analysed with one-way ANOVA, Pearson correlation and simple linear regression to differentiate between different age ranges. This study has shown that older subjects of both normal and low back pain patients have significantly larger transverse diameters and sizes of the L4-5 and L5-S1 intervertebral disc, compared with those of younger subjects. In addition, low back pain patients's disc sizes were larger than normal subjects but there was statistically no significant difference. The measurement of the intervertebral disc size can be considered as a clinically useful method for diagnosis of the low back pain and aging of the intervertebral disc. However, further study should be conducted to establish normal value of intervertebral disc size on large number of subjects.

• Proceedings of the KIEE Conference
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• 1995.07c
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• pp.1353-1355
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• 1995

While the modern society has been highly diversified and civilized, the demand for the safty of a power transmission has been greatly increased. For the underground cable, the performance of the electrical equipments is being improved by developing a new technology, and the reliability of the power supply is being up graded by impressing the diagnostic and monitoring technology of the system. In this paper the aging procedure of O.F and XLPE cables are described, including the diagnostic and monitoring equipments and the future subject.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1439-1443
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• 2011

Bimodal Tram is the new conceptual and environmental-friendly public transportation which adopted series hybrid system. The generator driven by CNG engine supplies the electric power to Battery and traction motor. The generator installed on the vehicle will experience the mechanical vibration and electrical transient variation. Those may cause some defects on the generator which will be the hazardous effects to the vehicle. This paper has investigated the possibility to find out some diagnostic features for the defects of generator through the voltage and current generated from it. Those were analyzed in both time and frequency regions. For the next, more works will be needed to complete the purpose of this paper.

• Journal of Physiology & Pathology in Korean Medicine
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• v.22 no.6
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• pp.1403-1409
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• 2008

The purpose of this study is to develop the systematic process on the discrimination of Sasang constitution with the pulse diagnosis apparatus. The pulse waves were acquired at the right and the left Guan point with 1420 people who were apparently healthy. In order to minimize the effect of aging on the shape of pulse wave, the age groups of 30s, 40s, and 50s were used. Taeum group was the best to classify, Soyang group was the worst. With the same group size, the sensitivity of Soyang group was increased. Input variables were selected with the consideration of the floating-sink ratio, tests of equality of group means, multiple comparison, multicollinearity, and structure matrix. To increase the sensitivity of Soyang, the variables which could tell the difference between Soyang and Soeum were selected.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1834-1835
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• 2011

본 논문에서는 22.9kV급 지중 전력 케이블의 열화에 의한 특성 변화를 분석한다. 케이블이 실제 선로로 포설될 경우 케이블에는 고전압이 흐르게 되고, 이로 인해 열이 발생하게 된다. 이와 같이 발생한 열에 의한 절연체 이상은 케이블 사고로 이어지므로 케이블의 열화 특성 분석은 사고를 미연에 방지하기 위해서 필요하다. 따라서 본 논문에서는 실제 선로에 사용된 후 교체된 케이블의 감쇠 상수를 구하여 열화가 진행된 정도에 따른 감쇠상수의 변화를 분석한다. 이 때, 네트워크분석기의 S-파라미터를 이용하여 감쇠 상수를 구하고, 정상 상태 케이블과 폐 케이블의 감쇠상수를 비교하여 열화에 의한 케이블의 특성을 분석한다.

• Journal of Biomedical Engineering Research
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• v.30 no.5
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• pp.355-361
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• 2009

Mitochondria play a key role in maintaining life by producing ATP and heat. Recent researches have demonstrated that degenerative diseases such as heart failure, obesity/diabetes, cardiovascular disease, and psychiatric diseases are accompanied by mitochondria dysfunction. In this sense, mitochondria medicine considers the significance of mitochondria in human pathology and tries to explain degenerative diseases as a fatal consequence of mitochondria dysfunction. Here, I introduce the fundamentals of mitochondria physiology and present examples showing the relationship between mitochondria dysfunction and chronic complex diseases. Although mitochondria medicine uses a molecular biological approach predominantly, a biomedical engineering approach might play a critical role in unveiling the complexity of mitochondria medicine and in its application to the diagnosis and treatment of chronic diseases. Thus, I also briefly review the prospects of research using biomedical engineering methods.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.59 no.1
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• pp.40-46
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• 2010

DC link electrolytic capacitors are widely used in various PWM power converter system, such as adjustable speed driver(ASD) or DC/DC converter. Electrolytic capacitors, which is the most of the time affected by aging effect, plays a very important role for the power electronics system quality and reliability. This objective of this paper is to propose a improvement method to detect the rise of equivalent series resistor(ESR) in order to realize the online failure prediction of electrolytic capacitor for DC link of PWM power converter. The ESR detection scheme is based on the determination of the electrolytic capacitor AC losses calculated from voltage/current measurement using AC coupling. Therefore, the preposed online failure prediction method has the merits of easy ESR computation and circuit simplicity compare with BPF method. Simulation results show the veridity of the proposed on-line ESR estimation method.