• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.6
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• pp.1120-1127
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• 2008

This paper presents implementation of localization system using UWB (Ultra-Wide Band) sensors and its experimental results along with development of context-aware services. In order for precise measurement of position, we experimented various conditions of pitch angles, yaw angles, number of sensors, height of tags along with measuring errors at each installation. As an application examples of the location tracking system, we developed an intelligent health training management system based on context-aware technology. The system provides appropriate training schedule to a trainee by recognizing position of the trainee and current status of gymnastic equipments and note the usage of the equipment through a personal digital assistant (PDA). Error compensation on position data and moving direction of the trainee was necessary for context-aware service. Hence, we proposed an error compensation algorithm using velocity of the trainee. Experimental results showed that proposed algorithm had made error data reduce by 30% comparing with the data without applying the algorithm.

• Journal of Radiation Industry
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• v.7 no.2_3
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• pp.221-224
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• 2013

RI-Biomics is a new compound word of radiation technology and Biomics related to the study of life. RI-Biomics is high radiation fusion technology by combining evaluation of pharmacokinetics in vivo (RI-ADME) of new drugs and medical materials using radioisotope and molecular imaging technology using nuclear medicine equipments. RI-Biomics fields are emerging with the increasing usage of radioisotopes (RI). In this paper, we investigated the latest trends of radioisotope using in RI-Biomics fields. The representative radioisotopes are $^{14}C$, $^3H$ and $^{32}P$ for the optimization and the selection of candidates in the development process of new drugs among the RI-Biomics fields. As shown in the status of accumulated income of radioisotopes, using amounts of radioisotopes are showing a tendency to increase every year. $^{14}C$ is 61.6% increase of accumulated income growth rate and $^3H$ increased by 58.8% and $^{32}P$ increased by 33.9% in 2012 compared to 2007. These isotopes are used in a variety of fields as using of $^{14}C$ for microdosing test, development of [$^3H$]cholesterol absorption inhibitors, study of [$^{131}I$]pyronaridine tetraphosphate for malaria therapy. These are going on in vivo test sucessfully. So, clinical research step is expected to begin soon. Therefore, usages of radioisotopes are necessary and need for the evaluation of pharmacokinetics, optimization and the selection of new drug candidates in the development process of new drugs among the RI-Biomics fields. So, using of radioisotopes is predict to increase continuously except for primarily used $^{14}C$, $^3H$.

• Journal of Digital Convergence
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• v.17 no.10
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• pp.405-410
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• 2019

This study is an primary analysis on convergence of porcelain lacquer painting art which is composed of porcelain art and raw lacquer technic. As a part of ceramic art, this study suggest 3 ways of porcelain lacquer decoration with understanding of its history and contemporary status. Lacquer technic gives stability for surface paintings and it also has various media to express its beauty. Porcelain lacquer decoration art contains artistic value and pragmatic purpose for daily life usage. These days, due to unavailability for mass production, it tends to be tried for art work purposes. However this artistic technic and value can be applied to porcelain goods, so that it will raise aesthetic pleasure and cultural diversity.

• Smart Structures and Systems
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• v.15 no.1
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• pp.135-150
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• 2015

Large concrete structures are prone to cracks and damages over time from human usage, weathers, and other environmental attacks such as flood, earthquakes, and hurricanes. The health of the concrete structures should be monitored regularly to ensure safety. A reliable method of real time communications can facilitate more frequent structural health monitoring (SHM) updates from hard to reach positions, enabling crack detections of embedded concrete structures as they occur to avoid catastrophic failures. By implementing an unconventional mode of communication that utilizes guided stress waves traveling along the concrete structure itself, we may be able to free structural health monitoring from costly (re-)installation of communication wires. In stress-wave communications, piezoelectric transducers can act as actuators and sensors to send and receive modulated signals carrying concrete status information. The new generation of lead zirconate titanate (PZT) based smart aggregates cause multipath propagation in the homogeneous concrete channel, which presents both an opportunity and a challenge for multiple sensors communication. We propose a time reversal based pulse position modulation (TR-PPM) communication for stress wave communication within the concrete structure to combat multipath channel dispersion. Experimental results demonstrate successful transmission and recovery of TR-PPM using stress waves. Compared with PPM, we can achieve higher data rate and longer link distance via TR-PPM. Furthermore, TR-PPM remains effective under low signal-to-noise (SNR) ratio. This work also lays the foundation for implementing multiple-input multiple-output (MIMO) stress wave communication networks in concrete channels.

• Journal of Soil and Groundwater Environment
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• v.25 no.2_spc
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• pp.16-27
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• 2020

Nitrate contamination has received much attention at local as well as regional scales. The domestic situation is not out of exception, and it has been reported to be very serious, particularly within agricultural areas as a result of excessive usage of nitrogen fertilizers. Meanwhile, nitrate can be naturally attenuated by denitrification in subsurface environments. The denitrification occurs through biotic (biological) and abiotic processes, and numerous previous studies preferentially focused the former. However, abiotic denitrification seems to be significant in specific environments. For this reason, this study reviewed the previous studies that focused on abiotic denitrification processes. Firstly, the current status of nitrate contamination in global and domestic scales is presented, and then the effect of geological media on denitrification is discussed while emphasizing the significance of abiotic processes. Finally, the implications of the literature review are presented, along with future research directions that warrant further investigations. The results of previous studies demonstrated that several geological agents could play a vital role in reducing nitrate. Iron-containing minerals such as pyrite, green rust, magnetite, and dissolved ferrous ion are known to be powerful electron donors triggering denitrification. In particular, it was proven that the rate of denitrification by green rust was comparative to that of biological denitrification. The results indicate that abiotic denitrification should be taken into account for more accurate evaluation of denitrification in subsurface environments.

• Proceedings of the Korean Society of Sericultural Science Conference
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• 1997.06a
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• pp.1-21
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• 1997

Silk is praised "Queen of Fiber", which wrote a glorious page in the history of human adornment culture. Thanks to the development of science and technology, silk production has been increased dramatically during last half century. Nowadays, as "Healthy Fiber" silk lets all the globe to be forming the "Silk Boom" Like in other scientific fields, a great deal of progress has been made in sericultural science and technology, which also accelerated the development of multipurpose utilization of sercultural recourses. The main tendency of the sericulture development is raising the quality of cocoon, and at the same time, increasing the output per unit mulberry area and labor production efficiency. The chief measure of raising the cocoon quality is breeding and selecting the new mulberry and silkworm varieties, preventing and curing the diseases and pests and improving the environment of mounting, and the symble for increasing the labor productivity is carrying out the technological system of saving labor and operation ease, and enlarging the production scale. As a natural protein fiber, silk will be still a favorite with human in the next century, because its structure and properties can not be replaced by other any fiber. The 21st century is the biological time, and measures of developing sericulture will use the achievement on the field of molecular biology and biotechnology to carry out the molecular breeding, development regulating, silkworm rearing industrializing, exploiting the new silk and its new usage, utilizing the sericultural resources, and producing the special protein from silkworm as a host of expressing exogenous genes so that make the sericulture to contribute more what it can do for the human being.

• Korean Journal of Clinical Pharmacy
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• v.31 no.3
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• pp.198-204
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• 2021

Background: Cardiovascular (CV) disease is known as one of the major causes of death from disease worldwide. Statin therapy plays a pivotal role in atherosclerotic cardiovascular disease (ASCVD) lowering the LDL-cholesterol level effectively. The purpose of this study was to evaluate the association of the intensity of statin therapy in adult patients of Korea and the risk of ASCVD of the patient group. Methods: We used data from sample of patients from the Health Insurance Review and Assessment Service (HIRA-NPS-2018). We analyzed the patterns of prescribing statins including types of statin, statin intensity, and number of patients with ASCVD or risk of ASCVD. Results: 155,512 patients were included in the analysis, and 27,950 patients (18.0%) was over 75 years. High-intensity statin usage was increased in ASCVD patients compared with the low-intensity statin use. The OR (odds ratio) of high-intensity statin were increased in myocardial infarction patients compared with low-intensity statin use showing the highest OR; 12.40 (95% CI; 9.48-16.22). At patient groups of angina, ischemic heart disease and carotid disease, high-intensity statin prescription rate was increased compared with low-intensity statin. However, there was no statistical significance between both statin prescription rates in patients of peripheral arterial disease, abdominal aneurysm, diabetic mellitus and atherosclerosis. Conclusion: The statin prescription rate showed intensity increasing tendency according to the risk of ASCVD. More aggressive statin therapy might be beneficial for the ASCVD patients based on the recent guidelines of dyslipidemia.

• Journal of the Korean Society of Clothing and Textiles
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• v.45 no.2
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• pp.390-407
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• 2021

The study aims to assess the current status of sustainable clothing habits from the perspective of consumers. Awareness and management behavior regarding microplastics from fashion products and usage of fleece and faux fur were investigated. A random online survey involving 413 women was conducted to figure out their perceptions on microplastics that are shedded from fashion products such as fleece and faux fur. The results indicate that 73.6% were not aware of the fact that microplastic is released during the washing process of fleece and faux fur. Furthermore, only 26.6% of the respondents who were aware of microplastics from clothing washing were making efforts to reduce its emission. The respondents considered product sustainability more in the selection stage than in the management stage (p<.001). The results revealed that, although the respondents were highly aware of the risk of environmental pollution that microplastics pose, they were neither fully cognizant of the fact that microplastics may come from fashion products, nor did they make efforts to reduce its emissions. Compared with respondents in their 20's, respondents in the age of 30-40 years seemed more aware of microplastics from fashion products and exerted more effort to reduce its emission.

• Neurospine
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• v.15 no.4
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• pp.383-387
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• 2018

Objective: Lower back pain (LBP) is a worldwide health problem, and magnetic resonance imaging (MRI) is a common modality used to aid in its diagnosis. Although specific guidelines for assessing the necessity of MRI usage exist, the use of MRI as the initial imaging method for LBP seems to be more common than necessary in general practice. Methods: We conducted a retrospective chart review of 313 patients who had undergone MRI of the lumbosacral spine during 2014-2015. We recorded and compared various factors, including age, sex, body mass index, current smoking status, race, symptoms, MRI findings, and progression to surgery within the next year. All rates were compared according to whether the MRI results showed radiographically significant findings (MRI-positive) or not (MRI-negative) using the chi-square or Fisher exact tests (if the expected cell count was <5). All analyses were performed using SAS version 9.4. Results: There were no statistically significant differences in the rates of each symptom between the MRI-positive and MRI-negative groups, which accounted for 58.5% (183 of 313) and 41.5% (130 of 313) of the MRIs, respectively. The difference in the rate of surgery in the next year (18% among MRI-positive patients and 8.5% among MRI-negative patients) was found to be statistically significant (p<0.05). Conclusion: Based on our findings, 41.5% of patients underwent lumbar MRI unnecessarily and 81% of patients with positive MRIs did not have surgery within the next year. Further physician training is needed to avoid unnecessary investigations and expenditures.

• The Journal of Sustainable Design and Educational Environment Research
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• v.17 no.3
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• pp.46-53
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• 2018

This study is to investigate the effect of the school dining space on the learning environment, such as study activity space, student self-government space, student communication and community building, as well as to suggest ways to utilize them. For this purpose, literature review and survey research were conducted. In the literature review, the understanding of the middle school curriculum, the study of the school facility space, the understanding of the school lunch, the communication and communication environment. The survey was conducted on 17 middle schools, 90 middle schools, and 65 non-cooking transportation middle schools in Jeollabuk - do to investigate the utilization status and standards of the Cafeteria dining space. As a result of this study, it is suggested that there will be a follow-up study on application of public design according to the usage for efficient utilization of school dining space.