• The korean journal of orthodontics
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• v.54 no.1
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• pp.26-47
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• 2024

Objective: This systematic review aimed to evaluate the correlation between vitamin D levels and the rate of tooth movement, external apical root resorption, bone biomarker expression, and bone remodeling. Methods: Three databases (PubMed, Scopus, and Web of Science) were systematically searched from inception until 14th March 2023 to identify studies investigating the correlation between orthodontic tooth movement and vitamin D in animals and humans. The quality assessment was made in accordance with the Joanna Briggs Institute Critical Appraisal Checklist. Results: Overall, 519 records were identified, and 19 were selected for the qualitative synthesis. Eleven studies investigated the effect of local administration (injections in the periodontal ligament, to the gingiva distal to the teeth, or submucosae palatal area) and systemic administration (oral supplementation) of vitamin D on tooth movement, external apical root movement, pro-inflammatory cytokines, and bone remodeling factors. The remaining eight studies investigated the correlation between serum vitamin D levels and salivary vitamin D levels on bone turnover markers and tooth movement. Conclusions: The findings of this systematic review support that vitamin D3 local injections might increase the rate of tooth movement via the receptor activator of the nuclear factor-kB/osteoprotegerin axis. However, the non-uniform study designs and the different protocols and outcome methods make it challenging to draw reliable conclusions.

• Journal of Intelligence and Information Systems
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• v.21 no.3
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• pp.79-99
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• 2015

The prediction of bankruptcy has been extensively studied in the accounting and finance field. It can have an important impact on lending decisions and the profitability of financial institutions in terms of risk management. Many researchers have focused on constructing a more robust bankruptcy prediction model. Early studies primarily used statistical techniques such as multiple discriminant analysis (MDA) and logit analysis for bankruptcy prediction. However, many studies have demonstrated that artificial intelligence (AI) approaches, such as artificial neural networks (ANN), decision trees, case-based reasoning (CBR), and support vector machine (SVM), have been outperforming statistical techniques since 1990s for business classification problems because statistical methods have some rigid assumptions in their application. In previous studies on corporate bankruptcy, many researchers have focused on developing a bankruptcy prediction model using financial ratios. However, there are few studies that suggest the specific types of bankruptcy. Previous bankruptcy prediction models have generally been interested in predicting whether or not firms will become bankrupt. Most of the studies on bankruptcy types have focused on reviewing the previous literature or performing a case study. Thus, this study develops a model using data mining techniques for predicting the specific types of bankruptcy as well as the occurrence of bankruptcy in Korean small- and medium-sized construction firms in terms of profitability, stability, and activity index. Thus, firms will be able to prevent it from occurring in advance. We propose a hybrid approach using two artificial neural networks (ANNs) for the prediction of bankruptcy types. The first is a back-propagation neural network (BPN) model using supervised learning for bankruptcy prediction and the second is a self-organizing map (SOM) model using unsupervised learning to classify bankruptcy data into several types. Based on the constructed model, we predict the bankruptcy of companies by applying the BPN model to a validation set that was not utilized in the development of the model. This allows for identifying the specific types of bankruptcy by using bankruptcy data predicted by the BPN model. We calculated the average of selected input variables through statistical test for each cluster to interpret characteristics of the derived clusters in the SOM model. Each cluster represents bankruptcy type classified through data of bankruptcy firms, and input variables indicate financial ratios in interpreting the meaning of each cluster. The experimental result shows that each of five bankruptcy types has different characteristics according to financial ratios. Type 1 (severe bankruptcy) has inferior financial statements except for EBITDA (earnings before interest, taxes, depreciation, and amortization) to sales based on the clustering results. Type 2 (lack of stability) has a low quick ratio, low stockholder's equity to total assets, and high total borrowings to total assets. Type 3 (lack of activity) has a slightly low total asset turnover and fixed asset turnover. Type 4 (lack of profitability) has low retained earnings to total assets and EBITDA to sales which represent the indices of profitability. Type 5 (recoverable bankruptcy) includes firms that have a relatively good financial condition as compared to other bankruptcy types even though they are bankrupt. Based on the findings, researchers and practitioners engaged in the credit evaluation field can obtain more useful information about the types of corporate bankruptcy. In this paper, we utilized the financial ratios of firms to classify bankruptcy types. It is important to select the input variables that correctly predict bankruptcy and meaningfully classify the type of bankruptcy. In a further study, we will include non-financial factors such as size, industry, and age of the firms. Thus, we can obtain realistic clustering results for bankruptcy types by combining qualitative factors and reflecting the domain knowledge of experts.

• Journal of Technologic Dentistry
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• v.32 no.4
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• pp.417-433
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• 2010

Purpose: This study evaluated the manpower planning of dental technicians. Methods: Methods : Survey was conducted regarding subject's general characteristics, characteristics of dental technician's occupational view and working conditions, and reason to enter into branches of the public health enter. The survey sample consisted of 323 dental technicians (221 male/ 102 female). Survey was conducted for one month from August 1 to September 1 in 2010. Following results were obtained. Results: 1. Regarding general characteristics of the subjects, there was a slight male predilection with 68.4%. Subjects in their 40s occupied the highest proportion of 32.2%. Majority of subjects worked in the big cities (71.5%). Favored working places were dental laboratory (57.6%) and dental hospital or dental clinic (19.5%). Although no position is available in the public sector such as public health center or health care civil servant, 9.3% preferred working in the public health center. Public sector is more favored than 2-year technical colleges or dental supply and equipment companies. In respect to education, 57% of the subjects graduated college. 67.8% were married. Subjects who specialize in the porcelain or all-ceramic were 57.9%. With regard to current position, head of the dental laboratory was most common. 2. Following occupation characteristics were found. Economic reason took the highest proportion when deciding their occupation (39.9%) followed by gaining social experience (36.5%). Majority of the subjects (76.5%) wanted to work as dental technicians until their retirement. 71.5% pursuit to become a manager of the dental laboratory. 76.1% agreed on opening a dental technician position in the public health center. Regarding an authority to lead developing the dental technician position in the public sector, majority of the subject chose ministry of health and welfare (35.6%) and Korean dental technologist association (34.7%). Employment (average, 30%) and turnover rate (average, 36.5%) of dental technology college graduates ranged from 40% to 60%. Most important factors for the employment were practical experience (41.2%) and competency (34.4%). With regard to job satisfaction, so-so as 46.7% and satisfactory was 42.7% 3. In respect to the reason for opening a position in the public health center, 'It is needed to continue denture rogram for elderly patients' obtained the highest score (4.14 point). 'Institutional devices are required to open a position for dental technicians as a public healthcare provider' received high score (4.11 point). 4. Concerning the working conditions, 'professional knowledge is required' received the highest score (4.23) followed by 'too short maternity and parental leave' (4.21). 5. Relationship between general characteristics of the subjects and favor of working in the public health center was investigated. Significant differences were found according to the current and favored working area, favored occupation, education level, marital status, and specialty. Working in the public health center was favored by following subjects: working in mid- or small-sized cities (4.16 point, p<0.05); PhD degree-holder (4.59 point, p<0.01). 6. Among general characteristics of the subjects, significant difference of working conditions was found in the following factors: gender; working areas; favored working areas; favored working positions, and education level. Majority of subjects favored working in big cities and currently work in big cities although satisfaction was comparatively low (3.75 score). 7. Future plan to work in public health center was evaluated according to occupational characteristics. Subject's intention to work in the public healthcare center was significantly affected by opening of dental technician position, leading authority, average turnover rate, and factors affecting employment. Working in the public health care center was favored by the following subjects: Dental technicians who actively supported opening of the dental technician position (4.34 point, p<0.001); subjects who thought the Korean dental technologist association is responsible for the opening of positions in the public sector (4.26 point, p<0.001); and subjects who thought that attitude and character are important for the employment (p<0.001). 8. Concerning difference of working conditions according to the occupational characteristics, significant difference was demonstrated by factors such as a reason to choose to be a dental technician, work plan, pursuing position, responsible authority, average employment rate, and job satisfaction. High standard of working conditions was required in subjects who selected to be a dental technician for the leisure time after work (s.05 point, p<0.01), who planted to work until their marriage (4.25 point, p<0.001), and who pursuit to be a manager (3.98, p<0.05). 9. In respect to influence of general characteristics on the advancement to public health centers, the coefficient of determination (R2) was 0.068 and age affected the working condition with significant difference according to the pvalue. 10. Regarding influence of general characteristics on the advancement to public health centers, the coefficient of determination (R2) was 0.335 and work plan, opening of dental technician position in the public sector, and responsible authority had significant influence over the subject's intention to work in the public health center according to the p-value. 11. With regard to the influence of general characteristics on the advancement to public health centers, the coefficient of determination (R2) was 0.091 and reason to choose to be a dental technician, work plan, and responsible authority significantly affected subject's working conditions. Conclusion: Korean society is becoming a super-aged society according to several statistics. As aged population is rapidly increasing, national health insurance plans to cover denture for senior citizen over 75 years old from 2012. Therefore, dental technicians are urgently needed in the public health centers all over the nation. Many subjects in this study planed to work until their retirement and recognized dental technician's expertise. Ministry of health and welfare and Korean dental technologist association should co-operate each other to prepare foundation and institutional devices for dental technicians to advance into the public health center. This will improve oral health of the population. This study showed urgency of medical facilities and services which meets increasing number of aged population and welfare of the population.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.6
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• pp.425-431
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• 2020

The purpose of this study was to provide nurses with the basic data to prepare nurses for systematic job embeddedness, job stress, and burnout in small and medium-sized hospitals and to identify any correlations. The data were collected between 1 November 2018 and 28 February 2019. The factors and general characteristics influencing the job embeddedness were found to be position (t=3.53, p<.001), total career (F=3.46, p=.034), current career (F=5.59, p=.004), and turnover experience (t=-1.72, p=.008). The job embeddedness was negatively correlated with the awareness of burnout (r=-.570, p<.001) and job stress (r=-.349, p<.001). Burnout (β=-.570, p<.001) and job stress (β=-.552, p<.001) had significant effects on job embeddedness (F=46.21, p<.001); the explanatory power of these variables was 34.9%. In other words, nurses in hospitals with fewer than 200 beds experienced higher job stress because they were exhausted. This suggests that it has a negative effect on job arrival, which is the intention to remain in the current organization. Therefore, it is necessary to manage exhaustion and job stress appropriately for the job.

• Korean Security Journal
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• no.10
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• pp.149-171
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• 2005

In Korea, local autonomy police has been discussed several times since Liberation in terms of expanding the democracy of police, but this suggestion has not been pursued. However under the incumbent government, the local policing system will be fully implements from 2006, and the government says that it aims to introduce 'model management' from October this year. The model of local policing now in force is based on the national police and local police forces organized in parallel within local government autorities (cities, counties and districts). The heads of local autorities have the power to appoint local police. Of these, local authorities can use public servants working for the national police for 'special purposes'. The research questions for this study were to what extent public servants working for the national police in these circumstances can desire local autonomy police, and what factors influenced their decision to desire in local autonomy police. After analyzing the results of a survey of police officers, the study found that public servants working for the national police did not have great expectations of desire in local autonomy police. The factors that influenced the decision to desire in local autonomy police were the hope that remuneration would be good, and the hope that the atmosphere within the police force would become less bureaucratic and more democratic than the current system. The study also found that the hopes that promotions and working conditions would improve and that police would be treated better in society did not influence the decision of public servants working for the national police to desire in local autonomy police.

• Journal of Korean Academy of Nursing Administration
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• v.4 no.1
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• pp.73-88
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• 1998

The management of nursing resource is very important. that is because nursing staff accounts for 30-40% of total staff in a hospital and nurses provide patoents with attentive service for hours daily. The continuous turnover of nursing staff. however, impedes the quality-oriented nursing care, which will consequently leads to the loss of human and material resource in competitive society. This study aimed to calculate nurse's activity and compare the activity amount based on career experience. Futhermore it aimed to find factors which would influence 'quality weighed direct nursing activity amount'. Questionnaires and check lists for this study were distributed to nurses in a suburban hospital outside of Seoul from October 20 to November 14. 1997. The nursing activities were calculated according to professionality. independency and working hour. And then it were accumulated by quality score. The collected data was analyzed by statistical methods as t-test, ANOVA, correlation, multiple regression. The results of this study were as follows ; Firstly, carrel' experience had no influence on the quality weighed nursing activity amount. But the quality level of service of skilled nurses was higher than that of new nurses. Secondly, career was a variable affecting the quality in nursing service. So career was positively related to the quality of nursing care. Patient's disease severity and number of patient were positively correlated with weighed nursing activity amount. But job satisfaction was negatively correlated v:ith the amount. Thirdly, the independent variables which had significant influence on the weighed nursing activity amount were disease severity and the number of patients, The severity score and number of patient were directly proportional to the weighed nursing activity amount. This results indicated· that weighed nursing activity amount was influenced by the number of patient and patient's disease severity. The quality score of nursing services for experienced members is higher than that of new staff. But both new and skilled staff showed no difference in the quality weighed nursing activity amount. Internal and. external environment influences nursing activities. The quality of nursing services is very important factor in nursing activity. Therefore nursing managers should make an effort to improve nursing care quality through continuous research. Also they should try to maintain experience nurses and assign nursing staff appropriately with patient's severity and other relevant factors being considered. The quality-improved nursing care in the hospital will strengthen hospital's competitiveness.

• Journal of the Korean Data and Information Science Society
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• v.27 no.3
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• pp.791-801
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• 2016

The purpose of this study is to examine factors affecting the intent of re-employment of inactive registered nurses. This study presents a secondary analysis of data collected in 'Nurse Turnover On-line Survey' by Korean Nurses Association and Korea Institute for Health and Social Affairs in 2014. The analysis shows that 70.9% of inactive RNs has an intent to return to practice, and most of them preferred 'flexible working options' (47.8%) or 'fixed day shifts' (43.3%) as a work pattern. Main reasons for resigning from their last job have been found to be 'high work intensity' (18.8%) and 'difficulties of night shifts' (16.7%). Inactive married RNs who have working histories in a general hospital or a long-term care hospital or have preferences for traditional shift works showed a stronger intent to return to practice than their reference group. Our study shows that, for inactive RNs to return to practice, it is recommendable to adopt various non-traditional working patterns, to make a staffing distribution considering the labor intensity and to develop education programs designed to increase RNs' professional satisfaction.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.7 no.4
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• pp.77-86
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• 2012

The purpose of this paper is to review the relationship between organizational commitment, and voluntary turnover(intention to leave), and the moderating effects of personal factors(gender and occupation) on the relationship between organizational commitment and intention to leave. In order to verify and achieve the purposes mentioned above, questionnaire data are gathered and analysed from 458 employees in Daedeok Innopolis Venture Enterprises, Dae-jeon Metropolis, South Korea. Multiple regression and multiple hierarchical regression analysis are applied to test the proposed hypotheses: 1) the relationship between organizational commitment(affective commitment, continuance commitment and normative commitment) and intention to leave, 2) the moderating effects of personal factors(gender and occupation) on the relationship between organizational commitment and intention to leave. Empirical survey's findings are as follows; First, affective commitment(AC) and continuance commitment(CC) are related negatively with intention to leave(IL), but normative commitment(NC) is not related significantly with IL. Second, gender positively moderates the relationship between affective commitment and intention to leave, and occupation negatively moderates the relationship between continuance commitment and intention to leave.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.197-208
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• 2018

The purpose of this study was to investigate levels of vocational identity, adaptation in a nursing school, and nursing student satisfaction with major and clinical practice, to examine their interrelationships, and to investigate predictors affecting the vocational identity of nursing students. The participants were 335 nursing students in D city who were surveyed from October to December 2016 using a self-report questionnaire. The data from 317 participants (response rate 94.6%) were analyzed. There was a statistically significant positive correlation between college adaptation, satisfaction with major, satisfaction with clinical practice, and vocational identity. In the multiple regression analysis, college adaptation, satisfaction with major, and satisfaction with clinical practice were factors significantly associated with the vocational identity. These three factors explained 50.6% of the vocational identity of nursing students. Due to the high turnover rate among new nurses, it is critical that nursing students have a vocational identity as nurses. In order to improve vocational identity, nurse educators should consider helping students to adapt to nursing college, and to become satisfied with major and clinical practice.

• Journal of Navigation and Port Research
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• v.38 no.6
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• pp.701-708
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• 2014

This study is aimed to obtain the influence of port hinterlands on container cargo volumes of Incheon port using System Dynamics(SD). Also, macro economic index such as exchange rates(US dollar), balance of current account, capital balance, Japan trade, China trade, export unit value index, import unit value index, total turnover of Incheon port were used as the factors that influence container cargo volumes of Incheon port. Moreover micro index regarding port hinterlands' operating companies such as total sales, rental fee, number of employees were introduced in the simulation model. In order to measure accuracy of the simulation, this study implemented MAPE analysis. And after the implementation, the simulation was decided as a much more accurate model because MAPE value was calculated to be within 10%. This study respectively examined factors using the sensitivity analysis. As a result, in terms of the effects on cargo volume in Incheon Port, the factor named 'cargo volumes of port hinterlands' operating companies' is most significant. And increasing the rental fee of hinterland was resulted in decreasing the cargo volumes of Incheon port.