• Food Science of Animal Resources
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• v.36 no.3
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• pp.389-396
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• 2016

In order to attain heavier live weight without impairing pork or sensory quality characteristics, carcass performance, muscle fiber, pork quality, and sensory quality characteristics were compared among the heavy weight (HW, average live weight of 130.5 kg), medium weight (MW, average weight of 111.1 kg), and light weight (LW, average weight of 96.3 kg) pigs at time of slaughter. The loin eye area was 1.47 times greater in the HW group compared to the LW group (64.0 and 43.5 cm², p<0.001), while carcass percent was similar between the HW and MW groups (p>0.05). This greater performance by the HW group compared to the LW group can be explained by a greater total number (1,436 vs. 1,188, ×10³, p<0.001) and larger area (4,452 vs. 3,716 μm², p<0.001) of muscle fibers. No significant differences were observed in muscle pH_{45 min}, lightness, drip loss, and shear force among the groups (p>0.05), and higher live weights did not influence sensory quality attributes, including tenderness, juiciness, and flavor. Therefore, these findings indicate that increased live weights in this study did not influence the technological and sensory quality characteristics. Moreover, muscles with a higher number of medium or large size fibers tend to exhibit good carcass performance without impairing meat and sensory quality characteristics.

• Transactions of the Korean Society of Automotive Engineers
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• v.22 no.5
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• pp.59-65
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• 2014

Diesel engines have the superior combustion efficiency and fuel economy that they are widely used for industry, heavyduty vehicles, etc. However, its exhaust emissions have become the major concerns due to their environmental impacts. Moreover, the depletion of fossil fuels is the main issue. Therefore, it is important to look for alternative sources of energy. Bio-diesel is one of the ideal energy which has proved to be ecofriendly for more than fossil fuels. The experimental tests analysed the engine performance and emission characteristics of a diesel engine using diesel and biodiesel blended of BD25, BD45 and BD65, in order to study the use of clean fuel to meet the increasingly stringent emission regulations. The engine performance was examined by using engine dynamometer while an exhaust gas analyzer was used to examine the emission characteristics. The effect of biodiesel on engine performance were lower to diesel through comparing their HP and torque but fuel consumption was slightly increased because of biodiesel has lower heating value and higher density than diesel. However, due to the better lubricity, the brake thermal efficiency of biodiesel was higher than diesel. The emission characteristics were strongly affected by the blending ratio of diesel and biodiesel. The results showed that the smoke opacity, hydrocarbons (HC) and carbon monoxide (CO) emissions decreased while the nitrogen oxides (NOX) slightly increased.

• Korean Journal of Occupational Health Nursing
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• v.22 no.2
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• pp.159-170
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• 2013

Purpose: To provide the data of health manager education program in order to improve the quality of work-sites health management with qualification based job analysis of health managers (Occupational Health Nursing, Industrial Hygienist, Environmental Engineer). Methods: A descriptive research on 132 health managers using IPA and SPSS/WIN. Results: The overall average of importance of health management job was 8.0 (10 being the maximum score). Nurses had significantly higher score in the level of importance per areas and health management jobs. The overall average of performance of health management job was 6.7 (10 being the maximum score). Nurses had higher score in the area of health management. IPA matrix distributions per health management job area showed the correlations in qualification backgrounds and all of 3 main areas. Conclusion: There was difference in the level of importance and performance on health management jobs based on the qualification backgrounds of health managers. To improve the health of workers, an integrated health management must be provided. And to provide this, it is necessary to offer the additional education to health managers with an institutional complementary plan.

• Journal of the Korean School Mathematics Society
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• v.15 no.3
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• pp.487-509
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• 2012

This study, in order to contribute to improvement of the affective domain for mathematics which is one of the largest issues of mathematics education, examined the background variables influencing mathematics anxiety of middle/high school students. As the result, the middle school students showed a greater level of anxiety than the high school students did, and especially the anxiety level according to environment factor and learning strategy factor was high. Also, male students showed overall a greater mathematics anxiety than female students did, and both group of students showed a higher anxiety level according to environment factor and learning strategy factor. Besides, the greater the time spent on private education was, the higher the mathematics anxiety level, and in test/performance factor, the group with low self-initiated learning time showed a higher level of mathematics anxiety compared to other two groups. Among four subfactors of mathematics anxiety test, the students overall scored lowest in anxiety for test/performance factor, and highest in environment factor.

• Korea Journal of Hospital Management
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• v.15 no.3
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• pp.1-16
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• 2010

As a cross-sectional study, this study was aimed to investigate and compare the job efficiency and satisfaction of nurses according to the hospital grade. Survey was conducted by mail on June 2009, and the respondents were 1,016 nurses working in 15 hospitals which are 9 high-grade general hospitals and 6 general hospitals. The percent of nurses acknowledging their hospital grades is 34.5%, and that is 20.5% at high-grade general hospitals. As the result of review of studies, it is concluded that under the circumstance that differential rates are contracted to calculate fees for hospital services and copayment of patients are according to nursing grades and hospital grades, the degree of nurses' awareness of insurance fees impact on their performance like recording of care and prescription. In order to improve nurses' performance, they need to be educated about the national insurance fee system. In hospitals with higher nursing grade and more beds, the levels of nursing quality and faithfulnes and their job satisfaction were higher. Nurses' awareness of their hospital nursing grade was related to the quality of nursing but not the faithfulness. Nurses working in higher nursing-grade hospital are more self-respect and satisfied at their jobs, and their job efficiencies are not significantly different. The current nursing fees based on the proper number of nurses per beds of nursing units should be changed to be based on the amount of job per nurse by their nursing protocol, and the nurse staffing standard should be differentiated between nursing grades. As the aspect of nursing, 24-hours patient care, it is difficult to improve nurses' job satisfaction, and in the other hand, that tends to depend on their income level. In the current circumstance, comprehensive research is required to investigate the propriety of 25% of the inpatient fees as the nursing management charge.

• Korean Chemical Engineering Research
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• v.47 no.1
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• pp.65-71
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• 2009

In this study, performance and economic analysis of natural gas/syngas fueled 100 MWth chemical-looping combustion (CLC) combined cycle plant were performed. Net efficiency of both cases was 53~54%, corresponding to previous research. We used Chemical Engineering Plant Cost Index and Guthrie method to evaluate plant cost. For syngas fueled CLC combined cycle plant, the plant cost was higher since lower heating value(LHV) of syngas was lower than that of natural gas and cost of electricity(COE) was also higher since the cost of syngas was higher than that of natural gas. By sensitivity analysis, it was shown that the cost of syngas should be less than 5.3 $/GJ in order to make COE lower than 5.8 ¢/kWh which was COE of natural gas fueled CLC combined cycle plant.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.29 no.9A
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• pp.1013-1021
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• 2004

In the WCDMA mobile multimedia communication system, the adaptive array antenna IS adopted to improve the performance of the system by reducing inter-user interference using antenna beam control. Usually, the interference resulted from the higher data rate users is much more significant to the lower data rate users than the other way around, so the overall performance can be enhanced by reducing the interference from higher data rate users. In order to maximize the efficiency of adaptive antenna operation, an optimal call admission control, especially during handoff, adaptive to the data rates is a critical problem. In this paper, We propose a call admission control algorithm based on the Soft QoS concept for the efficient processing of the handoff of higher data rate calls, and an adaptive handoff control mechanism according to the data rates. The proposed algorithm has been evaluated by computer simulation that it accommodates high data rate users among many lower data rate users much better, and the average call blocking probability for lower rate users becomes much lower than the conventional call admission control algorithm.

• The Journal of Korean Academic Society of Nursing Education
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• v.23 no.1
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• pp.27-36
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• 2017

Purpose: The purpose of the non-equivalent control group pretest-posttest study was to test the effects of self-directed nursing practice using peer-tutoring, on the level of confidence, performance and learning satisfaction of nursing students in practicing core nursing skills. Methods: The data were collected from 80 junior nursing students at a nursing college in Daejeon before and after 3 weeks of intervention on practicing six core nursing skills, according to the highest order of priority. The subjects were divided into the peer-tutoring practice group (PTPG, n=40) and the lecturer-guided practice group (LGPG, n=40). The data were analyzed using mean, frequency, and t-test. Results: The PTPG scored statistically higher than the LGPG on the performance of 'indwelling urinary catheterization' and 'wearing protection equipment while entering quarantine room & disposing waste'. The PTPG scored statistically higher than the LGPG on the confidence of 'indwelling urinary catheterization' and 'inserting intravenous catheterization'. The PTPG scored statistically higher on learning satisfaction than LGPG. Conclusion: The results showed that self-directed nursing practice using peer-tutoring could be effective for nursing students in improving proficiency in core nursing skills and might be applied to core nursing skills training.

• Management & Information Systems Review
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• v.38 no.1
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• pp.225-239
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• 2019

In order for a company to grow through technological innovation, technological innovation capacity to support technological innovation is more important than anything else. In addition, the technology commercialization process can not be ignored in order to lead to the improvement of the business performance. In this context, this study analyzed the impact of firm's technological innovation capacity on business performance and tried to analyze whether technological innovation capacity has a moderating effect on technological innovation capacity. To analyze the purpose of this study, we collect data through questionnaires of small and medium venture companies located in the southeast region of korea. The results of multiple regression analysis based on 132 collected company survey data are summarized as follows. First, Technology innovation capacity has a positive effect on business performance. Specifically, companies with well-equipped R&D capabilities, technology accumulation capabilities, and technology innovation systems showed higher business performance(market competitiveness, business growth potential, and business profitability). Second, technology commercialization capacity has a positive effect on the effect of technological innovation capacity on business performance. This result implies that a company with a good technical commercialization capability increases the positive influence of technological innovation capacity on business performance. The results of this study suggest that it is important to systematically manage the technology commercialization capacity in order to generate business performance through technological innovation.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.4 no.2
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• pp.123-136
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• 1992

A preliminary thermodynamic design model of two-evaporator refrigerator/freezer system is constructed. This system is based on Lorentz-Meutzner cycle using refrigerant mixtures. This model screens alternative refrigerant (R32, R125, R143a, R22, R134a, R152a, R124, R142b, R123) mixtures to select the best performance-giving refrigerant mixtures and its composition for the system. Also, it estimates the effects of cooling temperatures of intercoolers, evaporator's area ratio, cooling load ratio on the performance of the system. The COP of the system ranges from 1.4 to 1.6, which is superior to that of the single evaporator system charged with R12 by 13% to 29%. Among 15 mixtures, R22/R123, R143a/R123, R32/R142b, and R32/R124 (in the order of high COP) are most recommendable. For the case of R22/R123, R22 mass fraction more than 0.5(Load Ratio=1.0) or 0.7(Load Ratio=0.33) is recomended in order to replace R12 without reduction in volumetric capacity when keeping the compressor as the same one. COP has the highest value with X(R22)=0.7 and 0.8, respectively. For the case of R143a/R123, in the similar manner, mass fraction of R143a is more than 0.5 or 0.6 while best performance occurs at X(R143a)=0.8. Higher temperature intercooler is more important for the performance of the system than lower temperature intercooler. The area ratio of evaporators is roughly proportional to load ratio of the evaporators.