• Proceedings of the IEEK Conference
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• 1999.11a
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• pp.867-870
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• 1999

In this paper, we designed a 8-bit flash ADC, which can be used in fully differential circuits. We adopted a 2-step flash architecture with digital correction. The designed ADC is expected to work at the sampling frequency of 30MHz. We carried out the layout with 0.65${\mu}{\textrm}{m}$ CMOS technology The core size is 1.587mm$\times$1.069mm.

• Journal of the Korean Statistical Society
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• v.31 no.1
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• pp.45-61
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• 2002

We consider the problem of estimating binomial proportions in the presence of nonignorable nonresponse using the Bayesian selection approach. Inference is sampling based and Markov chain Monte Carlo (MCMC) methods are used to perform the computations. We apply our method to study doctor visits data from the Korean National Family Income and Expenditure Survey (NFIES). The ignorable and nonignorable models are compared to Stasny's method (1991) by measuring the variability from the Metropolis-Hastings (MH) sampler. The results show that both models work very well.

• The Journal of the Korea Contents Association
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• v.18 no.5
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• pp.58-70
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• 2018

This study aimed to investigate the positive and negative appraisals of care work held by care workers in elderly care facilities and to analyze the mediating effect of care worker's appraisals of care work on the relationship between job environment and service quality. For the purpose of the study, the data were collected from 298 care workers by using non-random and purpose sampling method. The results of the study showed job environment was a significant predictor in explaining in the variances of care work appraisal and service quality. In addition, care worker's positive and negative appraisals of care work were statistically significant mediators in the association of between job environment and service quality. Finding of the study indicated that service quality could be improved by not only improving job environment but also strengthening care worker's positive appraisal of care work. Finally, based on the findings of the study, implications and limitations of the study were discussed.

• Journal of Korean society of Dental Hygiene
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• v.16 no.5
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• pp.741-750
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• 2016

Objectives: This study aims to identify dentists' opinions about the return to work of the dental hygienists with career interrupted. Convenience sampling was made of 22 dentists with the clinical experience (about 0.25%) of the 4,944 members of Gyeonggi-do Dental Association. Data were collected through an electronic survey using e-mails and telephone interviews and analyzed using the constant comparison method. Methods: Open coding was assigned to the initial data from the survey in an explicit language, and focusing on the types of their employment, working conditions, etc. Summarization and conceptualization were made of the second data in an implicit language. Results: Most of the dentists were found to have positive attitudes toward the return to work of career interrupted dental hygienists and hope to adjust their wages based on their job performance or after their probational period expires. Most of the dentists were found to have positive attitudes towards the hygienists' flexible working although their concerns about work efficiency and hospital atmosphere. This study is a qualitative study that describes dentists' opinions and presents the need for the career interrupted dental hygienists to return to work. Conclusions: The study proposed that the educational institutions should take into account the hygienists' opinions when implementing the programs for promoting their return to work and their evaluative studies.

• Convergence Security Journal
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• v.11 no.2
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• pp.55-64
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• 2011

This study is to investigate the relationship of the effect of the private security guard unethical work ethic on job attitude and customer service. We extracted about 450 people examples after the Selection of the private security guard's in active service in Seoul in 2010, and totally 412 people examples were used. This study carried out factorial analysis, reliability analysis, correlation analysis, multiple regression analysis and pass analysis using SPSSWIN 16.0. The followings are conclusions. First, unethical work ethic affects on job attitude partially. Namely, tampering with work and information leaks reduce job attitude. Also, information leaks increase company's turnover rate. Second, unethical work ethic has no effect on customer service. Third, job attitude affects on customer service partially. In other words, the organizational commitment improves the quality of service but decreases the customer-centered service. Fourth, unethical work ethic has an effect on job attitude and customer service indirectly.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.19 no.5
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• pp.523-529
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• 2009

Smart sensor is known as intelligent sensor, it is different with other conventional sensors in the case of intelligent system embedded on it. Smart sensor has many benefits e.g. low-cost in usage, self-decision and self-diagnosis abilities. This sensor consists of perception element(sensing element), signal processing and technology of communication. In this work, a bridge and structure of smart sensor has been investigated to be capable to condition monitoring routine. This investigation involves low power consumption, software programming, fast data acquisition ability, and authoritativeness warranty. Moreover, this work also develops smart sensor to be capable to perform high sampling rate, high resolution of ADC, high memory capacity, and good communication for data transfer. The result shows that the developed smart sensor is promising to be applied to various industrial fields.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2003.05a
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• pp.39-43
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• 2003

This study aimed to understand changing of work organization on variation of social organization and research typological classification of office layout based on preceded understanding. Buildings result from social needs and accommodate a variety of functions-economic, social, political, religious and cultural. Therefore, We can explain historical development of the constructing a building we understand the society and studying, After The modern age, it select a three buildings that there is an historical value of office Layouts planning and comprehend that make use sampling type of office work structure, studies a felicitous Typological classification of office Layouts. They find the development direction of a hereafter office of the task organization out according to it, And we suggest to Typological classification of Office Layouts based on Organization Theories.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.2 no.2
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• pp.83-91
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• 1979

The purpose of this study is to analyze the direct relationship between doctors and number of patients to be treated by applying many kinds of I E's techniques. Generally, doctors in this research work both at OPD & IPD. Under the hospital manegement system that they are applying in, doctor's daily working schedules are instable because the numbers of OPD patients very daily. Therefore, the amount of time they spend for inward Patients are variable too. So the numbers of Patients have great influence to the whole hospital system management. In the first place, the author researched and analyzed a QC of administrative system. Tn the second place, the author carried out Work Sampling with a view for understanding quantity of a doctor's operation. The author suppose this research and analysis is one approach for improving systematic lay-out planning at outpatient waiting room where has many problems to be solved and suggest several process for improvement.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.2 no.2
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• pp.63-81
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• 1979

The purpose of this study is to analyze the direct relationship between doctors and number of patients to be treated by applying many kinds of I E's techniques. Generally, doctors in this research work both at OPD & IPD. Under the hospital manegement system that they are applying in, doctor's daily working schedules are instable because the numbers of OPD patients very daily. Therefore, the amount of time they spend for inward Patients are variable too. So the numbers of Patients have great influence to the whole hospital system management. In the first place, the author researched and analyzed a QC of administrative system. Tn the second place, the author carried out Work Sampling with a view for understanding quantity of a doctor's operation. The author suppose this research and analysis is one approach for improving systematic lay-out planning at outpatient waiting room where has many problems to be solved and suggest several process for improvement.

• International Journal of Precision Engineering and Manufacturing
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• v.5 no.4
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• pp.14-20
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• 2004

In this work, a new control methodology to achieve accurate position control of an AC servo motor subjected to external disturbance is proposed. Unlike conventional sliding mode controller which requires a prior knowledge of the upper bound of external disturbance, the proposed technique, called sliding mode controller with disturbance estimator (SMCDE), can offer robust control performances without a prior knowledge of the disturbance bound. The SMCDE is featured by an integrated average value of the imposed disturbance over a certain sampling period. By doing this, undesirable chattering phenomenon in the estimation process can be effectively alleviated. The benefits of the proposed control methodology are empirically demonstrated on AC servo motor and control responses are evaluated through a comparative work between the proposed and conventional control schemes.