• Journal of the Institute of Convergence Signal Processing
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• v.7 no.4
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• pp.195-200
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• 2006

The conventional discrete circuit for ABS/TCS system was examined and the problems of the system were analyzed by computer simulation. In order to improve the performance of ABS/TCS system, interface IC which has error compensation, comparator and under voltage lock-out circuit was designed and their electrical characteristics were investigated. The voltage regulator was included to compensate the temperature variation in the temperature range from $-20^{\circ}C$ to $120^{\circ}C$ for automobile environment. ABS and brake signal were separated using the duty factor of same frequency or different frequencies. UVLO(Under Voltage Lock-Out) circuit and constant current circuit were applied for the elimination of noise, and protection circuit was applied to cut the excess current off. Layout for IC fabrication was designed to enhance the electrical performance of ABS/TCS system. Layout was consisted of 11 masks, arrayed effectively 8 pads to reduce the current loss. We can see that the result of layout simulation was better than the result of bread board.

• Journal of Digital Convergence
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• v.19 no.1
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• pp.239-248
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• 2021

This study was aimed to investigate the factors influencing teacher efficacy of depression, anxiety, stress among school teachers in COVID- 19 special disaster area. The data were collected from May 9 to 16, 2020 for 123 high school teachers in D city. As a result of the study, the influential factor of teacher efficacy was satisfaction with duty (β=0.27, p=.002), economic level (β=0.18, p=.022), education (β=0.18, p=.022), subjective health state (β=0.16, p=.047), stress (β=-0.16, p=.044), gender(β=0.16, p=.042). These factors accounted for 35% in teacher efficacy. It was found that depression(β=-0.09, p=.468) and anxiety(β=-0.12, p=.320) had no significant effect on teacher efficacy. When developing a program to improve teacher efficacy, it is required to prepare measures not only to manage stress but also to improve job satisfaction.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.21 no.6
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• pp.266-283
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• 2022

With the rapid development of autonomous vehicle technology, unexpected accidents are occurring. Therefore, it is necessary to minimize user accident damage through the development of autonomous traffic safety education. Since edge cases, accident type, and risk factor analysis are important for realistic education, overseas case studies and demonstrations were carried out, and based on this, two curriculum for service providers and general users were developed. The service provider curriculum consisted of OEDR, sudden stop, cut-in, take-over, defensive driving, system malfunction, policy and information security education, and the general user curriculum consisted of attention duty, take-over, operating design domain, accidents type, laws, functions, information security education.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.11 no.1
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• pp.85-91
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• 2001

Background : It goes without saying that cumulative trauma disorders is spreading to various types of occupation in many advanced countries including America, and it forms considerable rate of total occupational disorders already. and as the result of it, the seriousness of worker health problem and economic loss owing to production loss, recuperation expense, etc. are on the increasing trend through whole society. In case of Korea, the related measures as well as accurate fact-finding survey data on cumulative trauma disorders aren't prepared in detail, so it implies forward problem would be serious. Purpose : The purpose of this study is to draw the risk factor of cumulative trauma disorders in production factory, to forecast the rate of occurrence of cumulative trauma disorders on the basis of subjective symptoms, and to present forward realistic and effective prevention measures by showing the risk of cumulative trauma disorders, objecting the production factory of a domestic riding automobile assembly shop, by estimating in the aspect of human-engineering through the analysis of risk factor being a cause of cumulative trauma disorders. Methods : For this study, I investigated work type and on-duty hours, breathing time, and subjective symptoms of cumulative trauma disorders through questionnaire, objecting the workers in press. car body, coating, and outfit factory. Results : As a result of research, 81.2% of workers were in the physical burden due to present working, and the highest prevalence by part of body is an waist. The higher a rule score, The higher the number of workers complaind for working intensity, and the higher age work duration, tool used time, the higher prevalence of subjective symptoms by part of body. The number of workers complaind subjective symptom for treatment is the highest in drugstore.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.2
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• pp.16-23
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• 2006

This paper presents a novel single-stage high frequency resonant inverter link type DC-DC converter using zero voltage switching with high power-factor. The proposed topology is integrated half-bridge boost rectifier as power factor corrector(PFC) and half-bridge high frequency resonant converter into a single-stage. The input stage of the half-bridge boost rectifier works in discontinuous conduction mode(DCM) with constant duty cycle and variable switching frequency. So that a boost converter makes the line current follow naturally the sinusoidal line voltage waveform. Simulation results have demonstrated the feasibility of the proposed high frequency resonant converter. Characteristics values based on characteristics analysis through circuit analysis is given as basis data in design procedure. Also, experimental results are presented to verify theoretical discussion. This proposed inverter will be able to be practically used as a power supply in various fields as induction heating applications, fluorescent lamp and DC-DC converter etc.

• Journal of the Institute of Electronics Engineers of Korea SC
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• v.43 no.1 s.307
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• pp.45-52
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• 2006

In this paper, authors propose a step-up converter of pulse width modulation (PWM) and power factor correction (PFC) by using a novel loss-less snubber. The proposed converter for a discontinuous conduction mode (DCM) eliminates the complicated circuit control requirement and reduces the size of components. The input current waveform in the proposed converter is got to be a sinusoidal form of discontinuous pulse in proportion to magnitude of ac input voltage under the constant duty cycle switching. Thereupon, the input power factor is nearly unity and the control method is simple. In the general DCM converters, the switching devices are fumed-on with the zero current switching (ZCS), and the switching devices must be switched-off at a maximum reactor current. To achieve a soft switching (ZCS and ZVS) of the switching turn-off, the proposed converter is constructed by using a new loss-less snubber which is operated with a partial resonant circuit. The result is that the switching loss is very low and the efficiency of converter is high. Some simulative results on computer and experimental results are included to confirm the validity of the analytical results.

• Journal of Korean Home Economics Education Association
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• v.21 no.4
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• pp.105-125
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• 2009

This study attempts to extract the necessary criteria as a secondary school home economics teacher through the factor analysis, and to analysis the teacher's and student's perceptions for the requirement criteria of home economics teacher(RCHET) thereof to confirm the necessary criteria as a secondary school home economics teachers. This research was based on the requirement criteria of home economics teacher developed by Korea Institute for Curriculum and Evaluation(KICE) Korean Home Economics Education Association(2008)(KHEEA) collected from secondary, upper secondary school home economics teachers and students in Jeollabuk-do. RCHET encompasses the six areas : (l)'Expert of lesson related to evaluation' (2)'Efficient manager of diverse materials for study', (3)'Student advisor equipped with a teaching sense of duty and sound humanity', (4)'Curriculum expert equipped with a expertise knowledge', (5)'A fair and democratic schoolroom environment promoter'. (6)'Career path counselling expert understanding student's characteristics and environments'. Through the factor analysis, six RCHET factors are more important to teachers than students. According to importance perception for RCHET, home economics teachers' qualification for minor second subject and participation of training program showed similar differences statistically in all RCHET factors. Thus, effort for expertise improvement of teacher had important influence on expertise improvement of teacher. As a result of examining the differences from importance evaluation for RCHET, similar differences from frequence of home project, preference of home economics teacher, manual training and home economics score, interest of home economics showed statistically.

• Journal of the Korea Society of Computer and Information
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• v.25 no.6
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• pp.231-237
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• 2020

The purpose of this study is to present theoretical and policy implications based on the results of the empirical analysis of job stress in consideration of insufficient prior research on the level of job stress by public officials in charge of social welfare and public officials in general administration. For this purpose, social welfare and general administrative positions working at the City Hall of G Metropolitan City and five autonomous districts(including the Dong community service center) were selected as subjects for research. The data analysis used the SPSS statistical program to obtain technical statistics based on the average of the lower variables of the job stress. According to the analysis, there is a difference in the subjective perception level of public officials in charge of social welfare and public officials in general administration in both internal factors of job, such as job demands and job autonomy and external factors of job, such as job insecurity, organizational system, conflict of relations, inadequate compensation, and job culture. Based on this, it presented policy measures that require the granting of self-esteem of public officials in charge of social welfare, improvement of their duties, and adjustment of their workload to an appropriate level.

• Journal of the Korean Society for Library and Information Science
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• v.55 no.1
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• pp.107-133
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• 2021

This study was performed in order to provide suggestions on how to strengthen librarian competency by evaluating and analyzing the competency value of librarians as information professions. First, the study divided the common competency value of librarians as human capital of libraries into skills, knowledge, behavior and attitude, and analyzed each area of competency value for librarians of the A-library. As a result, the average of the 'librarian's behavior and attitude' area was the highest, followed by the 'librarian's skill' area and the 'librarian's knowledge' area. Second, in terms of 'librarian's skill', A-library librarians' competence values were high in the order of 'communication', 'leadership', 'technology' and in the terms of 'librarian's knowledge' ones were high in the order of 'law and policy', 'marketing', 'learning and growth' and 'finance and accounting'. In addition, in areas of 'librarian's behavior and attitude', the factors were high in the order of 'ethics and values', 'interpersonal relationships' and 'customer service'. Third, the analysis of whether the average difference exists depending on the characteristics of A-library librarians on their evaluation of the competency value shows that only the 'working period' factor in the total competency value and the two factors 'age' and 'working period' were statistically significant in the 'librarian's knowledge' area. Forth, as a result of a regression analysis to identify the characteristics of A-library librarians and their impact on competency value, only the 'final education' factor was statistically significant for the competency value of the 'librarian's skill' area. Fifth, in the survey on problems and desirable improvement measures in increasing the competency value of librarians, the proportion of presenting problems and improvement plan in systemic aspects such as the 'librarian qualification system' and 'librarian training system' was high.

• Journal of Technologic Dentistry
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• v.10 no.1
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• pp.89-111
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• 1988

This study relates to the procedures and the attitude of dental technicians. In order to identify the attitude factors which have influence on the job satisfaction and the organizational commitment, self-administered questionnares were distributed by mail to 504 technicians randomlyselected from 482 dental laboratories registered in Korean Dental Lab. Association from February 6 to February 27, 1987. The following results were obtained: 1. Canonical correlation between the group of general variables and the group of job satisfactional variables was significant statistically as Rc=0.48. But canonical correlation between the group of general variables and the group of organizational commitment variables was insignificant statistically as Rc=0.37. 2. Canonical correlation between the group of job characteristic variables and the group of job satisfactional variables was highly significant statistically as Rc=0.69. Wage propriety, promotion opportunity and benefits propriety were highly influential factors among the job characteristic variables. 3. Canonical correlation between the group of job characteristic variables and the group of organizational commitment variables was highly significant statistically as Rc=0.61. Wage propriety, promotion opportunity of acquiring technique and duty importance were highly influential factors among the job characteristic variables. 4. The job characteristic variables which had influence on the job satisfaction varied statistically according to the general variables. in case of age, technical career, academic career and duty, the job characteristic variable was wage propriety and the business relations. 5. The job characteristic variables which had influence on the organizational commitment varied statistically according to the general variables. The case of male was applicable to wage propriety, the case of female was applicable to benefits propriety, the case of dental technicians who were less than 30 years old was applicable to wage propriety, the case of dental technicians who had more than 5 years technical career was applicable to monotonousness. 6. The most influential factor was wage propriety among job characteristic variables which influenced on the job satisfaction and the organizational commitment of dental technicians.