• International Journal of Automotive Technology
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• 제7권3호
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• pp.237-244
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• 2006

Limited and nonlimited emissions of scooters were analysed during several annual research programs of the Swiss Agency of Environment Forests and Landscape(SAEFL, BUWAL). Small scooters, which are very much used in the congested centers of several cities are a remarkable source of air pollution. Therefore every effort to reduce the emissions is an important contribution to improve the air quality in urban centers. In the present work detailed investigations of particle emissions of different 2-stroke scooters with direct injection and with carburetor were performed. The nanoparticulate emissions with different lube oils and fuels were measured by means of SMPS, (CPC) and NanoMet. Also the particle mass emission(PM) was measured with the same method as for Diesel engines. It can be stated, that the oil and fuel quality have a considerable influence on the particle emissions, which are mainly oil condensates. The engine technology influences the (nano)particle emissions by: mixture preparation, mixture tuning, oil consumption, postoxidation, quality, condition and temperature of the catalyst. Since the particulate emission of the 2-S consists mainly of lube oil condensates the minimization of oil consumption stays always an important goal.

• 한국산업보건학회지
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• 제22권2호
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• pp.91-99
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• 2012

Airborne chlorpyrifos concentrations in formulation workplaces have not been determined in Korea. The aim of the study was to evaluate chlorpyrifos concentrations of air in a formulation workplace and recognize the RBC cholinesterase activities for the formulation workers. 30 air samples (personal or area sampling) were collected and bood samples from 10 workers were collected for RBC chlorinesterase (RBC AChE) activity in a factory on May 2008. Air samples were collected by the National Institute for Occupational Safety and Health (NIOSH) method and were analyzed by GC-MS. Airborne chlorpyrifos concentrations ranged from 0.003 to $12.90mg/m^3$ and geometric mean (GM) was $0.15\;mg/m^3.$ Compared to Korean Occupational Exposure Limit (KOEL) of 0.1 (2011) or $0.2\;mg/m^3$ (2008), at 95% confidence, airborne concentrations exceeded the KOEL 69.7% or 56.1% of the time or less, indicating that this concentration level was unacceptable according to exposure assessment using a LogNorm2$^{(R)}$. Since the workers were continually at work on the organophosphate or carbamate pesticides formulation, individual baseline for RBC AChE activity was not determined. As the results of comparison with reference average value of RBC AChE activity, it was found that a worker was below 70% RBC AChE activity and five workers were abnormal.

• Journal of the Optical Society of Korea
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• 제17권6호
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• pp.525-532
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• 2013

Contrary to the academic interests of other existing studies elsewhere, this study deals with how the alignment algorithms such as sensitivity or Differential Wavefront Sampling (DWS) can be better used under effects from field, compensator positioning and environmental errors unavoidable from the shop-floor alignment work. First, the influences of aforementioned errors to the alignment state estimation was investigated with the algorithms. The environmental error was then found to be the dominant factor influencing the alignment state prediction accuracy. Having understood such relationship between the distorted system wavefront caused by the error sources and the alignment state prediction, we used it for simulated and experimental alignment runs for Infrared Optical System (IROS). The difference between trial alignment runs and experiment was quite close, independent of alignment methods; 6 nm rms for sensitivity method and 13 nm rms for DWS. This demonstrates the practical usefulness and importance of the prior error analysis using the alignment algorithms before the actual alignment runs begin. The error analysis methodology, its application to the actual alignment of IROS and their results are described together with their implications.

• The Journal of Asian Finance, Economics and Business
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• 제8권12호
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• pp.421-429
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• 2021

The aim of the study is to explore the impact of intellectual capital and knowledge management on public sector innovation and also role knowledge management as the mediator variable. The study applied a descriptive quantitative method and by using a simple random sampling approach to 200 civil workers in Indonesian government entities. The data was gathered using an online questionnaire technique and analyzed using the AMOS program for structural equation modeling (SEM). According to the findings of the research, intellectual capital has a substantial influence on knowledge management. As a result, intellectual capital and knowledge management have a significant impact on public sector innovation, with knowledge management serving as a mediator between intellectual capital and public sector innovation. Besides that, the findings of this study suggest that organizations can increase innovation by choosing the right intellectual capital and utilizing good knowledge management. This work addresses a vacuum in the literature on applying knowledge management in the public sector, and so adds substantially to the theoretical progress of the area. Moreover, this is the first study to test the mediating role of knowledge management in the relationship between intellectual capital and innovation in the public sector of a developed country.

• The Journal of Asian Finance, Economics and Business
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• 제8권5호
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• pp.277-285
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• 2021

This study aims to examine the effect of variables of financial management information systems, organizational culture, and human resource competence on the accountability of village government financial reporting. The sample was 65 villages in the two districts using a simple random sampling technique. To analyze the data of this research, multiple regression analysis was conducted. The results showed that organizational culture as a differentiator in the two districts, namely financial management information systems, organizational culture, and human resource competence has a significant positive effect on accountability in preparing village government financial reports in Tabanan Regency. Meanwhile, organizational culture does not have a significant influence in Badung Regency, this is because each village government has a different work culture. In the Tabanan regency, we use local culture as the basis for organizational culture, while in the Badung regency it can be examined between organizational culture and it is carried out differently, which indicates that no one organizational culture type is superior to other types. This means that all types can move in line with and hand-in-hand based on how and when organizational goals are to be realized.

• Psychiatry investigation
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• 제15권11호
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• pp.1030-1036
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• 2018

Objective In this study, we aimed to develop a model predicting individuals with suicide ideation within a general population using a machine learning algorithm. Methods Among 35,116 individuals aged over 19 years from the Korea National Health & Nutrition Examination Survey, we selected 11,628 individuals via random down-sampling. This included 5,814 suicide ideators and the same number of non-suicide ideators. We randomly assigned the subjects to a training set (n=10,466) and a test set (n=1,162). In the training set, a random forest model was trained with 15 features selected with recursive feature elimination via 10-fold cross validation. Subsequently, the fitted model was used to predict suicide ideators in the test set and among the total of 35,116 subjects. All analyses were conducted in R. Results The prediction model achieved a good performance [area under receiver operating characteristic curve (AUC)=0.85] in the test set and predicted suicide ideators among the total samples with an accuracy of 0.821, sensitivity of 0.836, and specificity of 0.807. Conclusion This study shows the possibility that a machine learning approach can enable screening for suicide risk in the general population. Further work is warranted to increase the accuracy of prediction.

• 한국보건간호학회지
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• 제33권2호
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• pp.270-283
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• 2019

Purpose: The aim of this study was to identify the job insecurity, job satisfaction, and organizational commitment of non-regular visiting nurses working at public health centers, and evaluate the effects of job insecurity on the job satisfaction and organizational commitment. Methods: This study was a descriptive survey study. One hundred forty-three visiting nurses, who were non-regular hired by 16 public health centers in B city, were selected using a convenient sampling method. Results: The results were analyzed using SPSS/Win 21.0. A feeling of helplessness (among job insecurity factors) and retention intention significantly affected the job satisfaction of non-regular visiting nurses, and their explanation power was 20%. Retention intention, a feeling of helplessness, and age significantly influenced the organizational commitment, and their explanation power was 26%. Conclusion: Therefore, it would be necessary to stabilize the employment type, provide appropriate promotion and compensation for nurses according to their work performance, and reduce the number of non-regular employees to increase the job satisfaction and organizational commitment of non-regular visiting nurses.

• 한국동물위생학회지
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• 제42권2호
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• pp.117-120
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• 2019

Bovine viral diarrhea Virus (BVDV) infections cause respiratory, gastrointestinal, and reproductive problems, such as infertility, abortion, stillbirth, and sickly offspring. Many countries have reduced the economic damage through the application of different control programmes, and some have successfully eradicated BVD. Detection and elimination of cattle persistently infected (PI) with BVDV is important for BVD eradication because PI cattle are a main source of BVD transmission. In this study, the prevalence of Korean native cattle persistently infected (PI) with BVDV was investigated and determined in 49 farms with 3,050 cattle. The all samples were collected by ear notch sampling. Korean native cattle with initial positives on antigen-ELISA (Ag-ELISA) were sampled again after 3~4 weeks and cattle with second positives in both Ag-ELISA and immunohistochemistry (IHC) were identified as PI cattle. Among the 49 farms, 14 (28.6%) farms had at least more than one PI cow and 21 (0.69%) of 3,050 cattle were determined as PI cattle. As a result of this work, it is suggested that national BVD eradication program is required to reduce economic losses by BVDV infection in Korean cattle industries.

• 한국보건간호학회지
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• 제33권1호
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• pp.98-108
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• 2019

Purpose: The purpose of this study was to identify factors influencing care workers' patient safety behaviors (PSB), we hoped to provide baseline data for its activation. Methods: The subjects of this study were chosen by convenience sampling, which included 114 care workers at long term care facilities. Data were collected from August 22 to October 10, 2018. The gathered data were analyzed using the SPSS program, which was used to Cronbach's alpha, descriptive statistics, t-test, ANOVA, Pearson correlation coefficient and stepwise regression. Results: The care workers' average PSB was at 7.81 points, patient safety culture (PSC) 3.86 points and safety of long-term care facilities 7.07. PSB positively correlated with safety of facilities(r=.802, p<.001) and PSC(r=.558, p<.001). Work attitude and satisfaction of job were explained 35.1% of the PSB. Conclusion: Administrators of long term care facilities should be interested in patient safety culture and improving job satisfaction of care workers in order to improve patient safety behaviors.

• 한국의류학회지
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• 제45권5호
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• pp.758-769
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• 2021

Today, functional gloves must allow the wearer to perform many kinds of delicate work while protecting the hands from hazardous materials. In this study, multiple analyses of 3D hand measurements were performed to provide information on the hand size and shape required for the design of functional gloves for adult men. Size and shape characteristics were identified from 19 different hand measurements, and three factors were collected through factor analysis. The aggregated factor score was used to classify men's hand shapes into three types. These types showed different distribution patterns according to age, indicating a significant distribution difference between hand type and age group. Discriminant analysis extracted nine items that highly contributed to determining hand type. However, since the data provided by Size Korea have some limitations in fully representing hand shape, sampling additional types of hand measurements and using consistent conditions and methods are required for more accurate analysis.