• Journal of Technologic Dentistry
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• v.41 no.2
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• pp.63-69
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• 2019

Purpose: The purpose of this study is to evaluate the effect of CAD/CAM system milling tool wear on the marginal and internal fit of PMMA implant interim prosthesis three-dimensional manner. Methods: A total of 20 crowns were fabricated with CAD/CAM method. Their designs were unified to first molar of the left maxilla. The Customized abutments were prepared and scanned with on optical model scanner. Five crowns were milled by the newly replaced tool (1st milling), and 15 crowns were milled by 2nd, 3rd, 4th milling tool. The marginal and internal fit of 20 interim crowns were measured using the triple-scan protocol. Results: Statistically significant difference was found between the $1^{st}$ milling group ($51.8{\pm}14.6{\mu}m$) and the $3^{rd}$, $4^{th}$ milling group ($128.6{\pm}43.8{\mu}m$, $146.2{\pm}38.1{\mu}m$, respectively) at the distal margins. In the mesial margins, There was a statistically significant difference between the $1^{st}$ milling group ($63.6{\pm}25.9{\mu}m$) and the $3^{rd}$, $4^{th}$ milling group ($137.2{\pm}25.9{\mu}m$, $186.8{\pm}70.6{\mu}m$, respectively). In the distal line angle, significant difference was found between the $1^{st}$, $2^{nd}$, $3^{rd}$ milling groups and the $4^{th}$ milling group. In the mesial axial wall, significant difference was found between the $1^{st}$ milling group ($52.2{\pm}20.3{\mu}m$) and the $3^{rd}$, $4^{th}$ milling groups ($22.8{\pm}8.8{\mu}m$, $7.8{\pm}5.7{\mu}m$). Conclusion: As a result of the experiment, decrease of the marginal and internal fit was statistically significant as the number of machining cycles increased. In order to produce clinically excellent restorations, it is recommandable to consider the condition of the milling tool wear, when designing the restoration with CAD program.

• Journal of Korean Society of Archives and Records Management
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• v.15 no.2
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• pp.103-136
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• 2015

The National Assembly Archives of the Republic of Korea has been using the National Assembly Archives and Records Management System, which added some archival function to the Standard Records Management System that they had previously developed. However, the Standard Records Management System has limits in order to reflect all the business functions of the National Assembly Archives, which also acts as an archival institution, because the system had been developed and distributed to perform the function of a records center. Moreover, the current National Assembly Archives and Records Management System focuses on the management of official records transferred in accordance with the regulations. For this reason, it is difficult to register and manage various record types such as records of the members of the National Assembly (related to legislative activities), oral history collected from the National Assembly leader, audiovisual records of proceedings, and so on. As such, this study analyzed the problems of the current National Assembly Archives and Records Management System and conducted case studies of the systems in the National Archives, the Presidential Archives, Changwon City, and the Cultural Heritage Administration. Through this research, it proposed that system functions, metadata, the target system of the National Assembly Archives, and the Records Integrated Management System need a development plan.

• Environmental and Resource Economics Review
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• v.25 no.1
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• pp.27-60
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• 2016

An integrated assessment model of climate and the economy (IAM) has been a standard tool for the economic analysis of climate change and policy recommendations. Since policy measures to address climate change take places at a national level, a regional integrated assessment model of climate and the economy (RIAM) is gaining more importance. A RIAM is a useful tool for the assessment of regional (or national) impacts of climate change. This paper investigates the main features of the currently available RIAMs. The focus is social welfare functions and the regional aspects of climate change. The comparative analysis shows that there is a huge gap between the economics of climate change and its applications to RIAMs. As an application, this paper examines the effect of social welfare functions on optimal solutions of the RICE (Regional Integrated model of Climate and the Economy) model. It is found that optimal climate policy such as carbon tax or emissions control rate is very sensitive to the assumptions on social welfare functions of RIAMs. It is better for each country to have their own RIAM as a basic tool for national climate policy-making and for international bargaining in greenhouse-gas mitigation. This is because a country's own preferences such as efficiency, equity, and sustainable development as well as national circumstances can be reflected in RIAM. The Republic of Korea has not developed its own RIAM yet. The comparative analysis and the numerical model in this paper can be a stepping stone for the development of such a national model.

• Therapeutic Science for Rehabilitation
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• v.12 no.4
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• pp.123-134
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• 2023

Objective : This study aimed to investigate the level of human rights sensitivity of occupational therapists and compare the differences in the level of human rights sensitivity between variables to provide a basis for awareness, human rights behavior, and the development of human rights education programs. Methods : A questionnaire consisting of general characteristics and 10 human rights susceptibility episodes was distributed, and 131 copies were analyzed. Results : The average score for human rights sensitivity was 58.75 for male and 55.44 for female therapists. As for the difference in human rights sensitivity by episode by sex, statistically significant differences were found in the right to avoid illegal arrest and restriction and the right to freedom from imprisonment. In addition, as a result of differences in changes in human rights sensitivity by subcategory, there was a statistically significant difference between males and females in the perception of responsibility. In the case of males, the average score for perception of responsibility was the highest, and in the case of females, the average score for perception of the situation was the highest. Conclusion : Based on the results of this study, it is necessary to strengthen the content of educational programs in clinical settings to improve human rights consciousness and behavior.

• Korean Journal of Biological Psychiatry
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• v.25 no.4
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• pp.118-124
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• 2018

Objectives Although impulsivity has long been thought as an important factor influencing suicidal behaviors, it is unknown whether impulsivity increases the risk of dying from suicidal behaviors and what specific component among constructs of impulsivity contributes to the risk of dying among suicide attempters. Methods To elucidate the association between impulsivity and medical lethality of suicide attempt among suicide attempters, we consecutively recruited 46 suicide attempters who visited an emergency room of a general hospital located in a metropolitan area, Seoul, Republic of Korea, due to suicide attempts and consented to participate in this study. Then we assessed medical lethality with the Beck Lethality Scale (LS) and impulsivity with the Korean version of the Barratt Impulsiveness Scale-11-Revised (BIS). Demographic variables were obtained from medical records and structured social work reports for suicide attempters. Results Although total scores of the BIS did not correlate with LS scores, only the scores of self-control, that is one of the Barrett's six theoretical constructs of impulsivity in which the higher score indicates less self-control and more impulsivity, had a significant positive correlation with scores of LS (p = 0.003). The association remained significant after adjusting for variables known to affect suicide lethality such as job status, recent alcohol consumption, diagnosis of depressive disorders, and having a plan for suicide (${\beta}=0.429$, p = 0.009). Conclusions Not impulsivity in general, but poor self-control, in particular, predicts lethal suicidal behaviors among suicide attempters. The degree of self-control should be evaluated when assessing patients with elevated suicide risk, and proper measures should be installed to prevent possible future lethal suicide attempts.

• Journal of agricultural medicine and community health
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• v.43 no.2
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• pp.114-124
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• 2018

Objectives: The purpose of this study is to examine the modern history of public health(PH) and suggest a way forward for PH nursing(PHN). Methods: This paper is a review article that derives results from literature review. Results: In the period of beginning (up to 1944), PHN began as the PH Department was created in the Hygiene Bureau in 1908 and tasks about nurses were legislated. PHN was limited to infectious disease tasks and performed mostly by missionaries. In the period of foundation formation (1945 to 1961), the Republic of Korea was founded, and PH policies and tasks were defined with the establishment of the central government organization and the applicable laws. In the period of foundation establishment (1962 to 1979), the Regional PH Act was amended, and as a result, PH Centers(PHCs) spread across the country. In the period of foundation expansion (1980 to 1994), the PH referral system of PHCs, PH Units, and Primary Health Care Post was established. In the period of organization in each area (1995 to 2005), PH programs reflecting changes in disease structure and public needs for the quality of life. A regional health care plan was launched. In the period of funtion expansion (2006 to present day), Centers for support health living were established. Conclusions: In the future, PH nurses need to have a macroscopic perspective that views PH through the overall PH system, and to expand from the existing healthcare concept to the national and global healthcare one.

• Korean Journal of Veterinary Research
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• v.40 no.3
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• pp.543-549
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• 2000

The pathogenicity of Br abortus RB51 strains, producted by commercial vaccine companies in Republic of Korea and USA, were evaluated in mouse and guinea pig. BALB/c and ICR mice were intraperitoneally inoculated with RB51 vaccines or virulent field strain and the existence of RB51 including its ratio of spleen to weights and persistence in spleens were examined. Groups of guinea pigs on day 55-58 of received subcutaneously with various RB51 vaccines, RB51 field isolates (Daehungjin) or virulent field isolates(Sangju) to compare the histopathogenicity in uterus. All the mice received RB51 vaccines or RB51 field isolates survived for 10 days, but the groups of mice received virulent field isolates died 5 from 11 (45.5%) in case of BALB/c mice and 12 from 12 (100%) in ICR mice, respectively. The number of RB51 in the groups of mice given with vaccine strains and RB51 field isolates were declined rapidly were in spleens between 12 and 20 days after inoculation. In contrast the mice given with the virulent field isolates rose in number of bacteria up to 20 days after inoculation. In the groups of mice infected with virulent field isolates, the ratio of spleen weights to body weight were significantly higher than those in control or in the groups inoculated with RB51 strain, including RB51 field isolates, at 12 and 20 days after inoculation. At ten days after inoculation, placentas of both the pregnant and non-pregnant guinea pigs were conducted for histopathological examination. Although any abnormal lesions were not observed in non-pregnant guinea pigs, all the strains caused the inflammation of the placenta, implying pathogenecity of RB51 in pregnant guinea pigs.

• Journal of Korean Neurosurgical Society
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• v.64 no.4
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• pp.644-664
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• 2021

Objective : Since the enactment of the Special Act on Korean Medical Residents, neurosurgeons working at training hospitals have been performing the duties of residents, in addition to their existing patient care responsibilities, which include surgery, education, and research. This study explores the relationships between work intensity, work-life balance, and burnout experienced by Korean neurosurgeons. Methods : The participants (n=451) were neurosurgeons working at training hospitals throughout Republic of Korea. Data on socio-demographic characteristics (including objective and subjective work environment), work intensity, work-life balance, and burnout were gathered using self-report questionnaires completed between March 1 and December 20, 2019. The data were analyzed using descriptive statistics, independent samples t-tests, one-way analysis of variance, Pearson's correlations, and multiple regression analysis. IBM SPSS Statistics for Windows, version 25 (IBM Corp., Armonk, NY, USA) was used for the analyses. Results : The work intensity, work-life balance, and burnout levels of neurosurgeons were 3.95, 3.57 (on a scale from 1 to 5) and 4.60 (on a scale from 1 to 7); and 280 (62.1%) of 451 neurosurgeons were found to be experiencing burnout. By controlling for the socio-demographic characteristics, the effects of work intensity and work-life balance on burnout were analyzed. Work intensity (B=0.314), work-life balance-family and leisure (B=0.216), work-life balance-growth (B=0.147), job stress (B=0.133), and satisfaction with human relationships (B=-0.069) were shown to be significant (all p<0.05), and they were found to affect burnout in the abovementioned order. The overall explanatory power was 58.3% (p<0.05), and the explanatory power with the addition of independent variables such as work intensity and work-life balance was 14.5% (p<0.05). Conclusion : This study showed that Korean neurosurgeons working at training hospitals experienced a high level of work intensity and job stress, and low work-life balance. Additionally, nearly half of the neurosurgeons were found to experience burnout related to factors such as work intensity, work-life balance, job stress, and satisfaction with human relationships. In particular, these factors seem to have deteriorated further after the implementation of the Special Act on Korean Medical Residents. These very high levels of burnout among Korean neurosurgeons who care for patients with both brain and spinal diseases may have a very important impact on patients' health. Therefore, it is recommended that the Korean Neurosurgical Society and the Korean government make efforts to improve the factors that affect burnout among Korean neurosurgeons.

• The Korean Journal of Air & Space Law and Policy
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• v.30 no.2
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• pp.155-176
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• 2015

Leasing is one of the main methods for Chinese airlines to introduce aircraft from overseas manufactures, and this method has been used for more than 30 years by Chinese airlines. Aircraft leasing in essence is a kind of financial transaction, through which lessors provide finance to lessees by means of the delivery of possession of the leased aircraft. At the time when China started to introduce aircraft through leasing some 30 years ago, the Chinese domestic laws were very insufficient to regulate these activities. Therefore, a construction process for the law of aircraft leasing was triggered then, and some fruit has been gained. By far, there are rules to adjust the aircraft activities in the aspects of contract, real right, default and bankruptcy remedies. However, as the improvement of any system must undergo a process of exploration, the law of aircraft leasing in China is still faced up with many challenges. Especially with the emergence and prosperous of domestic leasing industry, new transaction structures and models of aircraft leasing have emerged, which leaves new challenges to current legal system. On the basis of introducing the history and main contents of Chinese legal regime of aircraft leasing, this paper offers an analysis of achievements and challenges on present Chinese laws in the aspects of contract, real right and remedies.

• Analytical Science and Technology
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• v.28 no.3
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• pp.175-181
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• 2015

Cyantraniliprole, which is an ananthranilic diamide insecticide that was developed by the DuPont Corporation, was registered in the Republic of Korea in 2012. It offers exceptional insecticidal activity on a broad range of Lepidopera, Coleoptera, Diptera, and Isoptera. The maximum residue limits are set to pepper, peach, apple, sweet pepper, welsh onion, and so on (0.2~2.0 mg/kg). Therefore, an analytical method for determining cyantraniliprole residue in agricultural products was developed to ensure food safety. In previous studies, welsh onions were among vegetables included in the allium species, which is a representative plant with sulfur organic compounds. In this study, the analytical method was developed and evaluated for the elimination of sulfur compounds from the test solution of allium species during pesticide residue analysis. In order to inactivate the enzyme allinase and produce sulfur compounds, sample extraction was made in the base state pH 10 by reducing the activity of the enzyme. The recoveries of the developed method ranged from 81.9% to 83.2%, and the relative standard deviations were less than 10%. Therefore, based on the results, the method developed in this study is accurate and appropriate for use in cyantraniliprole determination. It will be used as the official method for managing the safety of cyantraniliprole residues in agricultural products.