• Journal of the Korean Wood Science and Technology
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• v.44 no.2
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• pp.231-240
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• 2016

The change in chemical compositions of leachate and medium density fiberboard (MDF) from a laboratory-scale simulated landfill which constructed in a plastic container containing alternating layers of soil and MDF was investigated to evaluate decomposing of MDF in soil. Four treatments were conducted: 1) MDF in soil, 2) MDF only, 3) cured UF resin in soil, and 4) soil only. Molecular weight (MW) distribution of compounds in leachate from soil only treatment did not change over time. In UF resin in soil treatment, the MW distribution shifted to a lower MW distribution over time, while the peak shifted to the left indicated changing to higher MW distribution in leachate from treatment 1 and 2 contained MDF. Higher percent nitrogen in leachate was observed in MDF containing treatments due to the UF resin in the MDF. The percent carbon slightly increased in MDF only while that greatly decreased in MDF in soil treatment maybe due to bacterial activity. The percent of extractable materials from the MDF decreased greatly on day 35 compare to day 0, and subsequently did not change much on day 77. In contrast, percent holocellulose and lignin did not change much over time. No structural change of the wood fiber in MDF occurs during the study. Water-soluble materials from MDF in soil contributed the change in chemical composition of leachate.

• The Journal of Asian Finance, Economics and Business
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• v.7 no.7
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• pp.379-390
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• 2020

This study aims to get empirical evidence about the influence of budgetary participation and understanding of the accounting system on the performance of local government apparatus with organizational commitment as an intervening variable. The population in this study was structural apparatuses in the Regional Apparatus Organization (OPD) of Sleman Regency, Indonesia, which included offices and agencies with a total of 25 OPDs. 125 people were selected as sample by using purposive sampling based on specific criteria. Data were analyzed based on multiple regression and path analysis (Analysis Path) utilizing the SPSS program. The results of this study indicated that budgetary participation had no positive influence on organizational commitment; understanding of the accounting system had a positive effect on organizational commitment; organizational commitment did not have a positive effect on the performance of local government apparatuses; budgetary participation did not impact positively on the local government apparatuses performance; understanding of the accounting system positively effected the performance of local government apparatuses; participation in budgeting did not have a positive effect on the local government apparatuses performance through organizational commitment; while understanding the accounting system had a positive impact on the local government apparatuses performance through organizational commitment.

• The korean journal of orthodontics
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• v.49 no.3
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• pp.150-160
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• 2019

Objective: This study aimed to analyze the effect of changing various parameters of the bone-borne rapid palatal expander (RPE) using the finite element method (FEM). Methods: In eight experimental groups, we investigated the effect of the number, position, and length of miniscrews; positional changes of the expander; and changes in the hook length on maxillary expansion. In finite element analysis, we compared the magnitude and distribution of stress, and the displacement changes following expansion of the bone-borne RPE. Results: When we compared the number and position of miniscrews, placing miniscrews in the anterior and posterior sides was advantageous for maxillary expansion in terms of stress distribution and displacement changes. Miniscrew length did not significantly affect stress distribution and displacement changes. Furthermore, anteroposterior displacement of the expander did not significantly affect transverse maxillary expansion but had various effects on vertical changes of the maxilla. The maxilla rotated clockwise when the miniscrews were placed in the anterior region. The hook length of the expander did not show consistent results in terms of changes in stress distribution and magnitude or in displacement changes. Conclusions: The findings of this study suggest that changes in the location and length of the miniscrews and displacement of the bone-borne RPE could affect the pattern of the maxillary expansion, depending on the combination of these factors.

• Journal of Korean Dental Hygiene Science
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• v.4 no.1
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• pp.79-87
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• 2021

Background: The purpose of the present study was to confirm the degree of physical activity and oral health behaviors of adolescents, and to investigate the relationship between them. Methods: The present study utilized data from the 15th (2019) Korea Youth Risk Behavior Web-Based Survey data, which included a total of 57,303 adolescents for analysis. Statistical analysis was performed using PASW Statistics 21.0. The significance level for significance was set at 0.05. Results: The rate of toothbrushing before sleeping was 1.152 times higher in the group that performed muscle strengthening exercises more than 3 times a week than in the group that did not (p < 0.001). The rate of use of oral hygiene products was 1.246 times higher in the group that performed physical activity for 60 min or more every day than in the group that did not, and 1.207 times higher in the group that performed muscle strength exercise at least 3 times a week than in the group that did not (p < 0.001). Conclusions: Adolescents who engaged in physical activities had a high rate of practice for some oral health behaviors. These results suggested that the group with positive health behaviors has a higher rate of oral health behavior practice, showing that health behaviors are highly interrelated.

• Journal of Korean Clinical Health Science
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• v.8 no.2
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• pp.1436-1443
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• 2020

Purpose: The purpose of this study was to differences in the expression rate of Porphyromonas gingivalis according to smoking status, smoking amount and period of smoking. Methods: At the time of investigation, 30 smokers and non-smokers were recruited among patients with periodontitis with a probing pocket depth(PPD) of 4 mm or more. General information was collected using a self-questionnaire, and the average value was used by a dentist to measure the probing pocket depth of three times each for the first or second molar. Plaque collection and analysis were performed by collecting only subgingival plaque using a conventional method, and the expression rate of P. gingivalis was confirmed using polymerase chain reaction (PCR). For statistical analysis, the SPSS Ver 25.0 program was used. Results: Smoking did not have a significant effect on the expression of P. gingivalis, but it did affect the expression of more type II genotypes (p<0.05). In addition, smokers had more slight periodontal pocket, and the amount and duration of smoking did not affect the expression of P. gingivalis. Conclusions: In the future, it is necessary to reinforce the group of smokers and non-smokers with healthy oral conditions, and to investigate the quantitative difference in the expression rate and genotype of P. gingivalis over time of harmful substances in smoking.

• Journal of Microbiology
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• v.33 no.2
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• pp.146-148
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• 1995

Coprinus congregatus has a membrane-associated laccase which is not secreted into culture media. A mutant monokaryon obtained, by U. V. irradiation followed by protoplast generation and regeneration method, was successfully isolated. When the mutant was grown on a agar plate or in a liquid medium, it secreted laccase while the wild type did not under the same growth conditions. The laccase of the mutant was compared with that of wild type did not under the same growth conditions. The laccase of the mutant was compared with that of wild type of native PAGE analysis, and showed identical mobility.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.313-314
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• 2000

최근들어 유해한 작업환경의 대기나 공장의 배기 가스, 또는 주변 주거 지역의 대기에서 검출되는 인체 유해 물질들에 많은 관심이 모아지고 있다. 이들 물질 중 휘발성 유기오염물(VOC)은 대기 중에 매우 낮은 농도로 존재하기 때문에 이의 측정은 매우 중요시되고 있다. 휘발성 유기화합물(VOC)의 분석 방법에는 GC-MS 또는 GC-FID에서 정확하게 측정하기 위하여 저온 농축법을 이용한 분석방법이 있으며 이들 두 가지 방법은 각각의 저온 농축시스템은 조절이 어렵고 작동하기가 복잡하다. (중략)

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.359-362
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• 2021

자기 주권 신원 증명 기술인 DID가 강력한 인증 수단으로 떠오르고 있다. 이런 DID 기술을 사용한 DIDComm은 중앙을 거치지 않는, 사용자끼리의 통신(P2P)을 가능하게 만들어 주며, 이는 강력한 보안을 제공해 준다. 본 글은 DIDComm 기술을 활용한 P2P 메신저에 대해 작성하였다. 이를 활용한 메신저는 사용자 간의 높은 보안을 가진 통신을 제공해 줄 수 있으며 앞으로의 인터넷 시대, 메타버스 시대에서 주목할 만한 기술이다.

• Journal of the Korean Data and Information Science Society
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• v.21 no.4
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• pp.651-667
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• 2010

In this paper, using a meta analysis of anti-hyperlipidemia effect of soybeans were studied. Studied the effects of soybeans using Hedges' standardized mean difference looked at the effect. Applying the fixed-effects model analysis of fecal cholesterol and total cholesterol and triglycerides showed a statistically significant reduction in HDL cholesterol increase was statistically significant at. In addition, the homogeneity of all variables by running the test did not meet the homogeneity of the kidney weight, between weight, HDL cholesterol, LDL cholesterol, total cholesterol, and triglycerides in the random effects model against the results of the analysis conducted by a statistically significant variable that did not.

• Physical Therapy Korea
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• v.14 no.1
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• pp.82-89
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• 2007

The Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) is a valid and widely used instrument for the assessment of osteoarthritis patients. In this study, data was obtained from the out-patients with painful osteoarthritis of the knee. One hundred-three out-patients were interviewed by physical therapists. In an exploratory way, a Korean version of the KWOMAC was analyzed for unidimensionality, item separation, and item difficulty using the Winsteps programs. Ninety-five patients with osteoarthritis of the knee over 65 years were analyzed for Rash analysis. In the analysis several functional items poorly fit to the model. These items included "heavy domestic duties" and "standing". In the pain domain, one item ("at night while in bed") did not fit the model. In the stiffness domain one item ("after sitting, lying, or resting later in the day") did not fit the model. Although 4 items from the 3 domains (pain, stiffness, function domain) do not fit well, the KWOMAC domains were confirmed by Rasch analysis. Thus the KWOMAC needs to be further examined before it can be used to properly determine the health status of the elderly with OA.