• Journal of Periodontal and Implant Science
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• v.51 no.3
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• pp.163-178
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• 2021

Purpose: The aim of this study was to evaluate clinical factors affecting the longevity of fixed retainers and the influence of fixed retainers on periodontal health in periodontitis patients. Methods: In total, 52 patients with at least 2 years of follow-up after periodontal and orthodontic treatment were included in this study. After scaling and root planing, orthodontic treatment with fixed appliances or clear aligners was performed. Fixed retainers with twist-flex stainless steel wires were bonded to the palatal or lingual sides of anterior teeth. Changes in clinical parameters, including the plaque index, gingival index, calculus index (CI), probing pocket depth, and radiographic bone levels, were evaluated before bonding of fixed retainers and at a 12-month follow-up. Cumulative survival rates (CSRs) for retainer failure were evaluated according to sex, site, CI, stage of periodontitis, and the severity of the irregularity with the log-rank test and hazard ratios (HRs). Results: Twelve months after bonding of fixed retainers, improvements were observed in all clinical parameters except CI and radiographic bone gain. The overall CSR of the retainers with a CI <1 at the 12-month follow-up after bonding of fixed retainers was significantly higher than that of the retainers with a CI ≥1 at the 12-month follow-up (log-rank test; P<0.001). Patients with stage III (grade B or C) periodontitis had a higher multivariate HR for retainer failure (5.4; 95% confidence interval, 1.22-23.91; P=0.026) than patients with stage I (grade A or B) periodontitis. Conclusions: Although fixed retainers were bonded in periodontitis patients, periodontal health was well maintained if supportive periodontal treatment with repeated oral hygiene education was provided. Nonetheless, fixed retainer failure occurred more frequently in patients who had stage III (grade B or C) periodontitis or a CI ≥1 at 12-month follow-up after bonding of fixed retainers.

• Acta Via Serica
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• v.7 no.1
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• pp.1-28
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• 2022

The province of the People's Republic of China, the Xinjiang Uygur Autonomous Region has historically been known under various names - Eastern Turkestan, Chinese Turkestan, Kashgaria, etc. In the early 19^th century this region was one of the least explored in Western scholarship and for the influence over which the so-called 'Great Game', geopolitical rivalry between Great Britain and the Russian Empire, gradually unfolded. This rivalry was one of the significant factors stimulating increased interest in an in-depth and comprehensive study of the geography, nature, and population of Kashgaria. Accordingly, in the second half of the 19^th to early 20^th centuries, several expeditions were organized that pursued serious academic goals alongside military, diplomatic, and commercial purposes. One of these expeditions, organized by the Imperial Russian Geographical Society, was the so-called 'Tibetan expedition' led by a talented scientist and military figure M.V. Pevtsov in 1889-90. The expedition followed the routes of Eastern Turkestan, the northern outskirts of the Tibetan Plateau, and Dzungaria studying this vast region's geography, topography, nature, climate, and population. The results of this investigation were presented by M.V. Pevtsov in a detailed and comprehensive report published in St. Petersburg in 1895. An important part of this narrative is the so-called "Ethnographic Essay of Kashgaria," which reflects the author's observations and thoughts on this region's ethnic composition, religious beliefs, language, customs, and rituals. This article offers insights and analysis of the content of Pevtsov's report, which provides valuable information about the daily life of the population of Kashgaria at the end of the 19^th century to an English-speaking audience.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.42 no.6
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• pp.793-802
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• 2022

Non-structural improvements to urban drainage systems are necessary to overcome the elevated levels of urban flood damage. This study proposed a type of automatic pump/gate operation technology for urban pump stations that takes reservoir inflows and river water levels into account and its performance is compared with the current operation using the concept of residual flow-based resilience. The proposed automatic operation relies on three pump operations and two gate operations. The water depth at the monitoring node was used for the pump operation, and the monitoring node was selected in consideration of the first overflow node and the maximum overflow node. The target area is the Daegu Bisan urban pump station, and the rainfall data consisted of probability rainfall sets with durations of 30 minutes, 60 minutes, 90 minutes and 120 minutes, and frequencies of 30, 50, and 70 years. As a result of the application of the proposed operation, differences in the resilience between the automatic operation and the current operation were at least 5.20E-05 with a maximum of 8.07E-04. The longer the duration is, the greater the difference in the resilience.

• Korean Journal of Culture and Social Issue
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• v.28 no.3
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• pp.441-481
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• 2022

This study attempted to explore the experience related to the work-family balance of working moms during the COVID-19 period. To this end, in-depth interviews were conducted by recruiting 17 part-time and full-time working moms with at least 1 child under the age of 13. As a result of analyzing the data using the method of grounded theory, 106 concepts, 50 subcategories, and 24 categories were derived. The central phenomenon that working moms experienced in the process of work and family balance were "physical and emotional exhaustion", "anxiety and guilt about not doing well in situations of role conflicts between various roles", "job crisis experienced by working mothers" and "deepening family conflicts". The process of working moms overcoming the central phenomenon and achieving work-family balance was identified as five stages: the 'shock and confusion stage', the 'struggling stage', the 'actively coping and making compromise stages', the 'acceptance stage', and the 'post-traumatic growth stage'. Based on these results, discussions on the work-family balance of working mothers during the COVID-19 period was dealt as well as suggestions for follow-up studies.

• Journal of Korea Port Economic Association
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• v.38 no.4
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• pp.1-11
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• 2022

Although the port distripark concept and its development policy have been introduced since almost twenty years, there is no visible results of the policy. Specifically, the level of value-added logistics using transhipment cargo is too low. In this paper, we mainly focus on the causes of the policy failure of port distripark's value added activities in terms of conceptual as well as practical or functional. Definitely, the study reviews the concept of port distripark compared to industrial park or bonded factory. The study also analyzes the differentiation of port distripark and port hinterland. The study generats that the problem or error that may occur when port hinterland is identified with the port distripark. Last but not least, the limitations of value added logistics is generated on the study. We examined in depth whether the already well known value added activity of port distripark is really activities that add 'value'.

• Journal of Oriental Neuropsychiatry
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• v.34 no.3
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• pp.151-161
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• 2023

Objectives: To examine effect of Korean medical treatment on patients with insomnia and correlations among changes in psychological scales before and after treatment. Methods: Medical records of 38 patients diagnosed with insomnia based on DSM-V who received Korean medical treatment (herbal-medication, acupuncture, Korean psychotherapy) for at least 8 weeks were retrospectively reviewed. Psychological scales including Insomnia Severity Scale (ISI), Beck Depression Inventory-II (BDI-II), State-Trait Anxiety Inventory (STAI), Beck Anxiety Inventory (BAI), and State-Trait Anger Expression Inventory (STAXI) were measured every four weeks and analyzed. Results: After eight weeks of treatment, ISI, BDI-II, BAI, STAI-X-1/2, and STAXI-S/T showed statistically significant decreases. Psychological scale pairs that showed a statistically significant correlation were ISI and BDI-IIㆍSTAI-X-1ㆍSTAI-X-2ㆍTA, BDI-II and BAIㆍSTAI-X-1ㆍSTAI-X-2ㆍAX-I, BAI and STAI-X-1ㆍSTAI-X-2ㆍSAㆍTA, STAI-X-1 and STAI-X-2, SA and TA, and TA and AX-I. In women, the improvement of AX-C was high. The improvement in AX-I score was significant when the disease duration was more than one year. A lower pretreatment BAI value predicted a greater decrease in ISI score after treatment. Conclusions: Korean medical treatment including herbal medicine, acupuncture, and Korean psychotherapy was effective in improving insomnia symptoms and accompanying symptoms such as depression, anxiety, and anger. In the future, more in-depth follow-up research is needed on the mechanisms by which various psychological problems (depression, anxiety, anger, etc) cause and worsen insomnia and the psychological symptoms secondary to insomnia.

• Journal of Korean Society of Rural Planning
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• v.29 no.3
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• pp.53-67
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• 2023

In this study, the problem of the idleness of public buildings in rural areas is seriously emerging, but there are no clear standards for assessing the utilization of these buildings. Therefore, this study endeavors to investigate the actual state of idleness of buildings created by rural area development projects based on the criteria for each type. As part of this study, rural facilities were selected in two locations in Sangju City and Miryang City among the target areas of the Rural Agreement. Utilization evaluation criteria were developed to identify the conditions of underutilization. In order to determine the utilization pattern for each facility type, an in-depth interview with the operator and an inspection of the facility were conducted. Based on the analysis, the degree of utilization (e.g., low use, non-use, etc.) was different for each facility type, and among the four facility types (rural tourism, culture and welfare, exercise and recreation, income-based), rural tourism was rated as the least efficient. It has been found that the operating entity's capacity has a significant influence on the utilization of facilities. Socioeconomic factors, such as a decrease in utilization rates, are greatly influenced by the operating entity's capacity. Therefore, support from local governments as well as the national level is required to recycle idle facilities. Lastly, this study suggests the need for different standards for utilization, depending on the type of facility. This moves beyond checking the degree of idleness by the same standard that was previously implemented.

• Journal of the Korean Society for Precision Engineering
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• v.13 no.10
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• pp.154-160
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• 1996

The control of diamond turning is usually achieved through a laser-interferometer feedback of slide position. The limitation of this control scheme is that the feedback signal does not account for additional dynamics of the tool post and the material removal process. If the tool post is rigid and the material removal process is relatively static, then such a non-collocated position feedback control scheme may surfice. However, as the accuracy requirement gets tighter and desired surface cnotours become more complex, the need for a direct tool-tip sensing becomes inevitable. The physical constraints of the machining process prohibit any reasonable implementation of a tool-tip motion measurement. It is proposed that the measured force normal to the face of the workpiece can be filtered through an appropriate admittance transfer function to result in the estimated dapth of cut. This can be compared to the desired depth of cut to generate the adjustment control action in additn to position feedback control. In this work, the design methodology on the admittance model-based control with a conventional controller is presented. The recursive least-squares algorithm with forgetting factor is proposed to identify the parameters and update the cutting process in real time. The normal cutting forces are measured to identify the cutting dynamics in the real diamond turning process using the precision dynamoneter. Based on the parameter estimation of cutting dynamics and the admitance model-based nanodynamic control scheme, simulation results are shown.

• Women's Health Nursing
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• v.29 no.2
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• pp.104-114
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• 2023

Purpose: The purpose of this study was to comprehensively understand and describe the meaning of physical activity for managing menopausal symptoms in middle-aged women. Methods: This study targeted middle-aged women with menopausal symptoms who participated in regular exercise at least three times a week for more than 12 weeks. Nine participants were individually interviewed via in-depth face-to-face interviews, and participatory observation was also employed. Colaizzi's phenomenological qualitative research method was applied for analysis. Results: Participants were asked, "What does it means to participate in physical activity at this time of your life?" Fourteen codes, six themes, and three theme clusters were derived for the meaning of physical activity for managing menopausal symptoms these middle-aged women. The six themes were "reviving the exhausted body and mind," "being free from the yoke of pain," "being settled in life," "finding oneself and becoming altruistic," "striving while anticipating change," and "equipping the body and mind." The three theme clusters were "overcoming my past pain," "taking the initiative for today's life," and "moving towards new change." Conclusion: The narratives revealed that physical activity allowed women to overcome menopausal symptoms, the burden of relationships, and stress, thereby enabling them to make positive changes in their lives and have expectations for the future. Thus, physical activity was a positive force in a healthy menopausal transition for women with menopausal symptoms. The findings of this study can be used to encourage physical activity in peri-menopausal women and to develop physical activity programs for managing menopausal symptoms.

• The Journal of the Convergence on Culture Technology
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• v.8 no.3
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• pp.613-621
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• 2022

The purpose of this study is to understand the transition experience from face-to-face lectures by nursing professors to non-face-to-face lectures. In this study, 17 nursing professors who have conducted non-face-to-face lectures for at least two semesters were collected through in-depth individual interviews according to the empirical phenomenological research method and analyzed according to the qualitative topic analysis method. The research results described the transition experiences of non-face-to-face lectures, focusing on the topics of change and development process according to non-face-to-face lectures, relationship with students, self-relationship, social context and sociality. In conclusion, nursing professors are expected to receive sufficient support to autonomously select non-face-to-face lectures using advanced technologies according to the trend of social change.