• Journal of Periodontal and Implant Science
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• v.51 no.3
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• pp.147-162
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• 2021

Purpose: This systematic review and meta-analysis was conducted to assess the effects of glycine powder air-polishing (GPAP) in patients during supportive periodontal therapy (SPT) compared to hand instrumentation and ultrasonic scaling. Methods: The authors searched for randomized clinical trials in 8 electronic databases for relevant studies through November 15, 2019. The eligibility criteria were as follows: population, patients with chronic periodontitis undergoing SPT; intervention and comparison, patients treated by GPAP with a standard/nozzle type jet or mechanical instrumentation; and outcomes, bleeding on probing (BOP), patient discomfort/pain (assessed by a visual analogue scale [VAS]), probing depth (PD), gingival recession (Rec), plaque index (PI), clinical attachment level (CAL), gingival epithelium score, and subgingival bacteria count. After extracting the data and assessing the risk of bias, the authors performed the meta-analysis. Results: In total, 17 studies were included in this study. The difference of means for BOP in patients who received GPAP was lower (difference of means: -8.02%; 95% confidence interval [CI], -12.10% to -3.95%; P<0.00001; I²=10%) than that in patients treated with hand instrumentation. The results of patient discomfort/pain measured by a VAS (difference of means: -1.48, 95% CI, -1.90 to -1.06; P<0.001; I²=83%) indicated that treatment with GPAP might be less painful than ultrasonic scaling. The results of PD, Rec, PI, and CAL showed that GPAP had no advantage over hand instrumentation or ultrasonic scaling. Conclusions: The findings of this study suggest that GPAP may alleviate gingival inflammation more effectively and be less painful than traditional methods, which makes it a promising alternative for dental clinical use. With regards to PD, Rec, PI, and CAL, there was insufficient evidence to support a difference among GPAP, hand instrumentation, and ultrasonic scaling. Higher-quality studies are still needed to assess the effects of GPAP.

• The Journal of Korean Academy of Prosthodontics
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• v.60 no.2
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• pp.168-174
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• 2022

In case of gingival recession or bone defect in maxillary anterior implant treatment, it is not easy to obtain satisfactory clinical results. In this case, loss of the labial alveolar plate was diagnosed in the maxillary right central incisor, so after tooth extraction, soft tissue was secured and implant placement with bone graft was planned. In addition, digital guide surgery was performed for the ideal implant position, and GBR (Guided Bone Regeneration) was accompanied with the xenogeneic bone and the autologous bone collected from the mandibular ramus since alveolar bone defects were extensive. After a sufficient period of osseointegration of the implant, a temporary prosthesis was fabricated through secondary stage surgery and impression taking, and through periodic external adjustment, the shape of soft tissue was improved. In the final prosthesis fabrication, a color tone of natural teeth was induced by an gold anodized customized abutment, and an aesthetic and functional zirconia prosthesis with reproducing the shape of the temporary prosthesis through intraoral scan was delivered.

• Journal of Korea Port Economic Association
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• v.38 no.1
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• pp.143-158
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• 2022

The shipping industry has experienced significantly fluctuated while decline in long-term and boom in short-term period due to the continuous recession of the shipping industry since the 2010s and during the recent COVID-19 pandemic. This study aims to suggest implications for securing manpower and personnel policy by analyzing the effects of job environmental factors of a liner shipping company on job satisfaction and turnover intention and differences between land and marine workers. For the analysis, the job environmental factors of a liner shipping company were divided into work character, relational factors, personnel characters, and remuneration factors, and then structural equation model and t-test were conducted to test the relationship between job satisfaction and turnover intention. As a result of the study, it was found that job environmental factors, such as work, relationship, personnel, and remuneration, had a positive (+) effect on job satisfaction, and job satisfaction had a negative (-) effect on turnover intention. In a comparative analysis between groups such as land and sea workers, it was found that the maritime workers group had higher job satisfaction and lower turnover intention than the land workers.

• The Journal of the Korea Contents Association
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• v.21 no.12
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• pp.906-917
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• 2021

This study focused on real estate rental income, which is being interested as a means of preparing for old age in the age of low growth and aging. Rental income is seen to function as a safety net of society at a time when it is necessary to live a difficult old age due to the disconnection of income and the extension of the average life span. Therefore, this study conducted the following study on 1,025 households that own rental real estate nationwide. First, the relationship between the characteristics of the household of the rental real estate owner and the real estate rental income was analyzed, and second, it examined whether there is a difference in rental income between the group that engages in income activities other than rental income and the group that only has rental income without income activities. As a result of the analysis, among the demographic and sociological characteristics, gender and spouse were identified as significant variables in rental income. Among the economic characteristics, income and total debt were found to be significant variables. In the case of income activities, rental income was low, and rental income was high when the total debt was high. However, if interest rates rise and the economic recession is prolonged due to unpredictable causes, the owner may suffer from double-use. In preparation for this, it is necessary to review real estate policy alternatives such as easing the period of real estate holdings.

• Journal of Korea Port Economic Association
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• v.39 no.1
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• pp.1-16
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• 2023

As the transfer of cargo functions to Gwangyang Port is completed, Yeosu Port has established a vision to become a hub for maritime tourism in Korea. Revitalization of the marine tourism industry through cruise development is recognized as a major strategy. Major domestic cruise tourism ports (Busan Port, Jeju Port, Incheon Port) have established a basic plan for fostering port cruises in response to the "Basic Plan for the Promotion of the Cruise Industry" established in 2016. However, the plan for Yeosu Port is insufficient. The cruise tourism industry, which is in recession due to Corona 19, is expected to recover due to with-Corona and Post-Corona. Therefore, Yeosu Port needs to take the lead in promoting the cruise industry to prepare for this. Accordingly, this study intends to derive evaluation items for the fostering of the Yeosu Port cruise industry through prior research and the gathering of expert opinions. An IPA (Importance Performance Analysis) analysis is conducted to identify problems and suggest promoting policies for the Yeosu Port cruise industry. According to the IPA analysis results, in the major categories, the creation of cruise infrastructure, and the establishment of a support system were evaluated as weak items (high importance but low satisfaction), and sub-categories corresponding to the two major categories were identified as weak points. Based on the results of this analysis, measures to promote the cruise industry in Yeosu Port were presented as cruise infrastructure, route expansion, tourism product development, and support system. This study is expected to be utilized when establishing policies for constructing Yeosu Port as the hub port of maritime tourism in Korea.

• Journal of Korea Entertainment Industry Association
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• v.13 no.1
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• pp.121-138
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• 2019

A term 'Wolabal' which is an abbreviation of the words, in South Korea means the balance between work and life. The term reflects on people's thoughts to seek for their happiness these days. In fact, they think that the quality of the life is more valuable than any other things on their lives, reflecting on the issues caused by modern societies. 'Wolabal' has emerged as an alternatives to solve the social issues like economic recession, high unemployment rate, aging society, low birth rate and etc. However, in order to establish 'Wolabal' as a culture the comprehensive agreement between an individual and society should be considered first. In society, the system or policies to forster cultural business should be settled while in individual, it is necessary to change the way they think about their work and the qualities of their lives. From this view we have to focus on the relationship between their work and leisure. On the relationship between their work and leisure we should understand that the relationship is not conflicted but co-exists and understanding the real meaning of the relationship is critical in balancing between work and life. The recognition to the labor which has been from the past would give not only the meaning of individual survival but the one of their whole lives. Despite this, modern society has faded away the real meaning of labor because it has focused on the mass manufacturing and sometimes the long-termed economic sluggish has emerged. This trend has made people think about their lives and seek for their lives' real value.

• Journal of Periodontal and Implant Science
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• v.53 no.2
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• pp.120-134
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• 2023

Purpose: We investigated whether repeated irradiation with light-emitting diodes (LEDs) at a combination of 470 nm and 525 nm could suppress the progression of experimental periodontitis. Methods: A experimental periodontitis model was established in the second, third, and fourth premolars of the mandible in beagle dogs for 2 months. The spontaneous progression of periodontitis was monitored under the specified treatment regimen for 3 months. During this period, the animals were subjected to treatments of either plaque control only (control) or plaque control with LED application (test) at 2-week intervals. The clinical parameters included the probing pocket depth (PPD), gingival recession (GR), and the clinical attachment level (CAL). Histomorphometric analysis was performed using measurements of the length of the junctional epithelium, connective tissue (CT) zone, and total soft tissue (ST). Results: There were significant differences in PPD between the control and test groups at baseline and 12 weeks. When the change in PPD was stratified based on time intervals, it was shown that greater differences occurred in the test group, with statistical significance for baseline to 12 weeks, 6 to 12 weeks, and baseline to 6 weeks. There was no significant difference in GR between the control and test groups at any time points. Likewise, no statistically significant differences were found in GR at any time intervals. CAL showed a statistically significant difference between the control and test groups at baseline only, although significant differences in CAL were observed between baseline and 12 weeks and between 6 and 12 weeks. The proportion of CT to ST was smaller for both buccal and lingual areas in the control group than in the test group. Conclusions: Repeated LED irradiation with a combination of 470-nm and 525-nm wavelengths may help suppress the progression of periodontal disease.

• Journal of Popular Narrative
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• v.25 no.3
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• pp.41-66
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• 2019

This paper looks at the readers and publishing strategies of paperback romance novels in the the 1980s based on the 'high-teen' concept. The purpose of this article is to examine the meaning the 'high-teen' concepts as expressed in the media through the publication of paperback romance series in the 1980s. Among paperback romance series, this paper was based on pirated/licensed version of novels published by Harlequin, a Canadian publisher, and the magazine media's advertising promotional phrases that were published targeting the same readers. Since the 1970s, mass media have referred to teenagers as high-teens and called them important consumers. High-teen was a term referring to teenagers in school uniforms, mostly girls, and in the 1980s, 'high-teen' was also introduced as a new consumer market, and the publishing market put forward a number of publishing strategies to attract them. The paperback romance, including , has identified 'high-teen' readers as late-teen girls, sensitive consumers for best-sellers/million-sellers, readers with a tendency to read stories of love, and readers that favor American and Western culture. Since the 1980s, the market for paperback romance has been in the recession, but readers have kept the romance genre alive by accepting and localizing the Harlequin series. With the rise of a new form of media called the 'Web Novel', interest in the romance genre is increasing, and we hope this study will serve as a starting point for a variety of discussions with (women) readers about romance reading/enjoyment.

• Korean Association of Arts Management
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• no.49
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• pp.149-176
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• 2019

It is a known fact that the spread of multiplexes has contributed to movie industry flourish and extending public rights for enjoying movies. However, in terms of Urban Discourse, Multiplexes centered in new downtown have given rise to Doughnut Phenomena in old downtown. It is especially regrettable that the local theaters which have been symbolic cultural spaces storing the 'memory of life' of local communities are disappearing due to a recession of business zone in old downtown. Japan has long been worked in various activities spotlighting on movie/image contents as the major means of creative urban regeneration. Among them, the 'Community Cinema' has made a contribution to regional revitalization by improving movie screening environment of the local community through renewal of local theaters and further creating related culture and industry in the local area. In this study, I focus on 'Fukaya Cinema' which started from NPO(Non-Profit Organization) and reused a closed industrial facility to a movie theater in cooperation with local TMO(Town Management Organization). Fukaya Cinema, which operates in the form of a business community, plays important roles as the core cultural facility in the local community and is regarded as a significant case showing a possibility of urban regeneration using movie/image contents. I investigate the specific founding process and activities of Fukaya Cinema and intend to derive the implications from that. Through this, I aim to provide the basic urban regeneration data utilizing movie/media contents.

• Korea Trade Review
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• v.43 no.5
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• pp.159-177
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• 2018

The container shipping sector is an important international logistics operation that connects open economies. Freight rates rapidly change as the market fluctuates, and staff related to the shipping market are interested in factors that determine freight rates in the container market. This study uses the Vector Error Correction Model(VECM) to estimate the impact of factors affecting container freight rates. This study uses data published by Clarksons. The analysis results show a 4.2% increase in freight rates when world container traffic increases at 1.0%, a 4.0% decrease in freight rates when volume of container carriers increases by 1.0%, a 0.07% increase in freight rates when bunker price increases by 1.0%, and a 0.04% increase in freight rates accompanying 1.0% increase in libor interests rates. In addition, if the current freight rate is 1.0% higher than the long-term equilibrium rate, the freight rate will be reduced by 3.2% in the subsequent term. In addition, if the current freight rate is 1.0% lower than the long-term equilibrium rate, the freight rate will decrease by 0.12% in the following term. However, the adjusting power in a period of recession is not statistically significant which means that the pressure of freight rate increase in this case is neglectable. This research is expected to contribute to the utilization of scientific methods in forecasting container freight rates.