• Journal of Korean society of Dental Hygiene
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• v.13 no.1
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• pp.1-12
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• 2013

Objectives : In order to make a proposal of a Korean standard dental hygiene curriculum, the job description of the National Health Personnel Licensing Examination Board was analyzed to prepare a job analysis matrix of dental hygienist to select required core competency. Methods : Data were analyzed to test the job validity of dental hygienist and categorize the duties of dental hygienist. A proposal of a standard dental hygiene curriculum was mapped out by making a comparative analysis of the courses necessary for American authorization of dental hygiene curriculum, existing proposals of Korean standard dental hygiene curriculum and the courses of the departments of dental hygiene offered by domestic three-year colleges and four-year universities. Results : Basic medicine courses were reinforced or newly offered to provide an opportunity for students to transfer to a domestic four-year university or to a foreign university. In the field of clinical dental hygiene and practice, preventive dentistry, prophylaxis and practice were integrated, and the names of the related courses were unified to give a chance for students to engage in comprehensive dental hygiene practice. There were different courses for dental clinical science at present. In this proposal, students should earn 125 credits in total. Conclusions : Standard dental hygiene curriculum proposal was required by three-year and four-year colleges across the nation. To make it happen, the original names of dental hygiene courses should be used, and the dental hygiene certification and evaluation institute that is under the umbrella of the Korean Dental Hygienists Association should lay out the standard of the KSDHEP to facilitate the utilization of the standard dental hygiene curriculum proposal.

• 유체기계공업학회:학술대회논문집
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• 2002.12a
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• pp.363-369
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• 2002

Orifice meter is the most widely used flowmeter in custody transfer between KOGAS and city gas companies. Absolute pressure value is needed to calculate the gas flow of orifice metering system, but the gauge pressure transmitters are mainly used in the field. In case that the gauge pressure transmitters are used, the fixed value as standard atmospheric pressure(101.325kPa) is applied for the absolute pressure value. The real, local atmospheric pressures of each metering station are different from the standard condition as the altitude and weather conditions. In this study the flow calculation errors were quantitatively analyzed through examining the atmospheric pressures of 50 stations of KOGAS. The data for analysis are such like the time data of supplied gas amount, the altitude of each metering station, the time data of atmospheric pressures and altitudes of each weather observatory. The results showed that the local atmospheric pressures were different from the standard value and the gas flow calculation errors were distributed between $-0.024\%{\~}0.025\%$ based on the supplied gas amount in the year 1999 and 2000.

• Journal of Biosystems Engineering
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• v.26 no.6
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• pp.517-524
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• 2001

Steep and narrow ramp installed in the paddy field makes it difficult and sometimes dangerous to drive agricultural machines on it. Because agricultural machinery become larger and heavier, it is necessary to revise design standard for ramp to provide safe travel. This study was conducted to revise the design standard fur paddy field ramp, especially for its width and slope. A mathematical model predicting travelling path of a tractor on paddy field ramp and farm road was developed and simulated. To verify this model, field tests were carried out. The model could predict trvelling path with RMS Error of 12.5cm and 8.2cm, which were judged to be adoptable fur determining the width of paddy field ramp. By applying this model to 110ps tractor, which was assumed to be the largest tractor in Korea, width of paddy field ramp was determined as over 3.6m. The slope of paddy field ramp, which provided tractor with 10% of the total weight of the tractor and the mounted implement as reaction force at front wheel against ground was analyzed by considering weight transfer effect on a ramp. The result showed that adequate slope of paddy field ramp was 14°.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.23 no.10
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• pp.646-655
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• 2011

This study aimed at quantifying the impact of the reinforced standard for envelope insulation on heating and cooling energy consumption in a Korean detached house as well as at identifying the effect of regionally subdivided standards. For them, a series of simulations for application of the reinforced standard on respective walls, roof, floor, windows, and all envelopes were computationally conducted for a prototypical detached residential building. In addition, the subdivided standards were applied to each regions-central and southern regions, and the Jeju island. Analysis revealed that heat transfer through envelopes was the most significant source of building heat gain and loss; the reinforced standard effectively reduced heating energy consumptions, especially in central region; and the subdivided standards did not presented a clear difference in the amount of energy consumption for the southern region and the Jeju island, thus, a further study is required to investigate the necessity of regional subdivisions.

• Nuclear Engineering and Technology
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• v.56 no.7
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• pp.2698-2703
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• 2024

A bilateral comparison was conducted between the International Atomic Energy Agency (IAEA) and the Korea Research Institute of Standards and Science (KRISS) to measure the absorbed dose to water in accelerator photon beams. KRISS served as a linking laboratory to compare the IAEA standard with the key comparison reference value (KCRV) of the BIPM.RI(I)-K6 program, in which KRISS participated in 2017. Two ionization chambers from the IAEA were used as transfer instruments for the comparison. Both laboratories measured the calibration coefficients of these instruments and calculated the ratios. The ratio of the KRISS standard to the KCRV was applied to obtain the degree of equivalence of the IAEA, along with its uncertainty. The largest deviation of the IAEA measurement from the KCRV was 3.4 mGy/Gy, significantly smaller than the expanded uncertainty of 10.7 mGy/Gy (k = 2, 95% level of confidence). This study demonstrates the equivalence of IAEA's measurement standard for accelerator photon beams to other primary standard dosimetry laboratories. It provides evidence for the satisfactory operation of IAEA's quality management system and enhances the international credibility of the IAEA SSDL network, particularly in high-energy accelerator photon beams from linear accelerators.

• Journal of the Korean Wood Science and Technology
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• v.45 no.3
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• pp.343-359
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• 2017

Many researches and policies have been carried out for saving energy in buildings. However, there are a few studies of thermal characteristics of wood-based materials that have been widely used as structural materials and finishing materials in buildings. In this study, thermal bridging areas were found to investigate thermal performance of residential building using non wood-based materials and wood-based materials. And heat transfer analysis of 16 case studies according to composition of structural materials and finishing materials was conducted. Also in this experiment, Physibel Trisco was used as the heat transfer analysis simulation tool, which conforms to the calculation method of ISO 10211. Analytical modeling was also carried out according to the ISO 10211, and the boundary temperature conditions were set at room temperature $20^{\circ}C$ and outdoor temperature $-11.3^{\circ}C$ (Seoul standard) according to the energy saving design standard in South Korea. Applied structures are classified according to the cases of concrete structure with non wood-based finishing materials, concrete structure with wood-based finishing materials and wood structure. Analyzed building elements were divided into a wall, a roof, an interlayer floor and a bottom floor. As a result, it can be confirmed that the thermal bridge of the concrete structure and wood structure were caused by the geometrical and material causes. In addition, the structural thermal bridge was caused in the discontinuity of the insulation in the concrete structure. Also it was confirmed that the linear heat transfer coefficient of the wall decreases when the wood-based materials are applied to the concrete structure.

• Journal of the Korean Society of Clothing and Textiles
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• v.13 no.4
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• pp.400-411
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• 1989

Moisture related properties of fabrics in dynamic modes are considered to be important in the judgement of the subjective comfort characteristics of clothing fabrics. In the current study, an attempt to improve the cobaltous chloride test method was made which has been known as a convenient screening test for dynamic surface wetness. The color changes of cobaltous chloride treated fabrics on the simulated sweating skin were calibrated against standard color strips. The standard color strips were made of all typs of test fabrics and installed inside of the test tubes containing a series of saturated salt solutions, which gives more quantitative informations on dynamic moisture transfer Influences of fiber types and finishes on dynamic moisture transfer in textiles were studied using a single layer of fabric samples. Fiber types included $100\%$ cotton, C/P 50/50, C/P 35/65. Durable press and soil release finished cotton and C/P 50/50 fabrics were also included. There were significant fiber effects on the dynamic moisture transfer. The order of time taken to reach to the specified $\%$ RH was C/P 35/65$100\%$ cotton fabrics. It was possible to detect significant finish effects by increasing the concentrations of cobaltous chloride solutions. The order of time taken to reach to the specified $\%$ R.H was durable press$100\%$ cotton, C/P 50/50, C/P 35/65 and $100\%$ PET were placed at the inner side of the outer layer and tested. It was shown that cobaltous chloride treated $100\%$ cotton fabirc was easier to detect color changes than C/P blend fabic in the double layer experiments. By placing test sample under the cobaltous chloride treated cotton fabrics, it was able to detect the differences among the test samples, some of which were known to be difficult in padding with cobaltous chloride solutions. Besides, the double layer method would provide with the broader application of the cobaltous chloride method in !uture, since it is possible to test the dynamic moisture transfer of clothing as worn.

• Journal of Korean Academy of Nursing Administration
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• v.9 no.1
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• pp.141-150
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• 2003

Purposes : This study was to investigate the job stress and turnover intention related to transfer of duty post of staff nurses working in general hospitals. Method : The subjects of this study were 384 staff nurses working in 6 general hospitals, with more than 200 beds, in Daegu and Kungbuk province in Korea. Data were collected through questionnaires and from Sep. 15 to Oct. 6, 2001. The used tool for measuring the degree of job stress was developed by Kim and Gu(1984) and the used tool for measuring the degree of turnover intention was developed Kim and Lee(2001). The data were analyzed into frequency, percentage, mean, standard deviation, t-test, ANOVA, Tukey's post hoc contrast, Pearson's correlation coefficient according to the purpose of study by use SPSS Win 10.0 statistical program. Results : The following are the results of the study: (1) Average score of the job stress, turnover intention of resignation of the subjects were 2.64 and 4.44. (2) The result of the analysis of job stress related to transfer of duty post was higher in job stress; not satisfaction of current duty post(t=-2.06, p=0.04). (3) The result of the analysis of turnover intention related to transfer of duty post was higher in turnover intention; period of the an advance notice when transfer to current duty post less than 7day(F=3.55, p=0.02), not satisfaction of current duty post(t=-2.45, p=0.02), want the transfer from current duty post(t=3.68, p=0.00). (4) The study reveals that there was statistically significant positive correlation relationship between job stress factors and turnover intention(r=.183, p=.000). Conclusion : The study which relating to period of the an advance when transfer and satisfaction of current duty post and reconsideration of transfer of duty post shows statistically significant difference between job stress and turnover intention. Therefore it is regarded that is needed to set a period of profer advance notice, grip on unsatisfactory factor of current duty post and intervention and management of the subjects were wanted transfer of duty post.

• Journal of Mechanical Science and Technology
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• v.17 no.11
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• pp.1801-1811
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• 2003

An experimental study was conducted to investigate the effects of air-side fouling and cleaning on the performances of various condenser coils used in unitary air-conditioning systems. A total of six condenser coils with different fin geometry and row number were tested. Performance tests were performed at three different conditions: clean-as-received, after fouling, and after cleaning. In all cases, it was observed that the fouling was mostly confined to the frontal face of the heat exchanger as reported in the previous investigations. The amount of deposited dust was more dependent on fin geometry for the single-row heat exchangers than for the double-row heat exchangers. The predominant effect of fouling was to cause a more significant increase in air-side pressure drop than a degradation in heat transfer performance. For the single-row heat exchangers, the pressure drop increased by 28 to 31%, while the heat transfer performance decreased by 7 to 12% at the standard air face velocity of 1.53 m/s depending on fin shape. For the double-row heat exchangers, the pressure drop increased by 22 to 37%, and heat transfer performance decreased by only 4-5% at the same air face velocity. Once the contaminated coils were cleaned according to the given cleaning procedure the original performance of the heat exchangers could almost be recovered completely. The pressure drop could be restored within 1 to 7% and the heat transfer performance could be recovered to within 1 to 5% of the originally clean heat exchangers. Therefore, it is concluded that a periodic application of the specified cleaning technique will be effective in maintaining the thermal performance of the condenser coils.

• Journal of Family Resource Management and Policy Review
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• v.22 no.1
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• pp.23-37
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• 2018

This study aimed to investigate resource transfer for baby boomers' adult children and related factors pertaining to baby boomers' later-life preparation. This study was conducted in 2016 using written questionnaires completed by 405 baby boomers residing in Seoul and metropolitan cities in South Korea. The data were analyzed using IBM SPSS Statistics 23.0 and the following statistical methods: frequency, percentiles, the mean, standard deviation, a t-test, one-way ANOVA, Cronbach's alpha, and hierarchical multiple linear regression analysis. Baby boomers' average level of later-life preparation was found to be 3.45/5, a relatively rational score. Baby boomers tended to transfer more resource from their adult children when they had many adult children, were more satisfied with their romantic relationship. Baby boomers' level of later-life preparation was higher when there was lesser resource transfer of their adult children. The greatest influential variables pertaining to the respondents' later-life preparation were their family's income, children's marital status, satisfaction with their romantic relationship, and level of transfer from their adult children. It was concluded that baby boomers have insufficient later-life preparation in terms of finances due to their need to support their adult children; thus, nation-wide practical programs are needed to prepare baby boomers for a happy life.