• Proceeding of Spring/Autumn Annual Conference of KHA
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• 2008.11a
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• pp.266-270
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• 2008

The construction wastes have been enormously increased after 90's, but construction wastes have depended on reclamation, therefore the environmental disruption and contamination are getting in the hot issue of society and in controversy with residents. With the consequence that indicates a substitute about an application of construction waste units is the most important thing for studying construction wates of quantity when the construction units are demolished. Nowadays, the area under the housing environment amelioration policies is getting rapidly old, then it is beyond anticipating reconstruction. Likewise, it is common when the process of construction wastes make progress to investigate uneconomically in point of facts, therefore to derive economical effects using construction wastes units should be urgent as soon as possible. In conclusion, the purpose of this study offers the variety of construction wastes and process of treatments, comparison of which the construction is demolished and economical effects of application of construction units.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10b
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• pp.1259-1264
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• 1990

During the past two decades, a lot of researches have been done on the synthesis of grassroot heat exchanger networks(HEN). However, few have been dedicated to retrofit of existing heat exchanger networks, which usually use more amount of utilities (i.e. steam and/or cooling water) than the minimum requirements. This excess gives motivation of trades-off between energy saving and rearranging investment. In this paper, an algorithmic-evolutionary synthesis procedure for retrofitting heat exchanger networks is proposed. It consists of two stages. First, after the amount of maximum energy recovery(MER) is computed, a grass-root network featuring minimum number of units(MNU) is synthesized. In this stage, a systematic procedure of synthesizing MNU networks is presented. It is based upon the concept of pinch, from which networks are synthesized in a logical way by the heuristics verified by the pinch technology. In the second stage, since an initial feasible network is synthesized based on the pre-analysis result of MER and must-matches, an assignment problem between new and existing units is solved to minimize total required additional areas. After the existing units are assigned, the network can be improved by switching some units. For this purpose, an improvement problem is formulated and solved to utilize the areas of existing units as much as possible. An example is used to demonstrate the effectiveness of the proposed method.

• Korean Journal of Poultry Science
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• v.25 no.3
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• pp.103-111
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• 1998

This study was carried out to estirnate the heritabilities and genetic correlations on egg shape index and internal egg qualities ; shell thickness, alburnin heights and Haugh units for breeding plan and selection in Korean native chicken. Data analyzed were the records of 46,908 eggs from 43() layers from April, 1994 to September, 1995. The egg shape index at the first egg, 300 days and 500 days of ages were 74.771, 74.468 and 73.702; the shell thickness were 0.345, 0.344 and 0. 334mm; the alburnen heights were 6.579, 6.130 and 5.318mm; the Haugh units were 86.859, 81.014 and 73.565 respectively. The heritability estimates of egg shape index and internal egg qualities based on the variance of sire, dam and combined components at 300 days of age were 0.136, 0.954 and 0.545 for egg shape index; 0.201, 0.622 and 0.421 for shell thickness; 0.410, 0.961 and 0.633 for albumen height ; 0.353, 0.962 and': 0.608 for Haugh units. The genetic correlation coefficient between shell thickness and albumen height was -0.044~0.824; 0.016~0.949 between Haugh units and shell thickness 0.313~0.941 between albumen height and Haugh units, respectively.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.2210-2211
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• 2008

In this paper, we investigated the quenching characteristics of a superconducting fault current limiter (SFCL) with connection of $2{\times}3$ matrixes. This SFCL consists of the trigger part to apply magnetic field and the current-limiting part to limit the fault current. When the fault occurs, the magnetic field generated in the reactor connected in parallel was applied to the two superconducting units of the current-limiting part to reduce of inhomogeneous critical current behavior between the superconducting units. The quenching behavior of a superconducting unit in the trigger part was affected by the increase of turn numbers. This is because of the difference of current distribution between the inductance of the reactors and the resistance generated in the superconducting units in trigger part. We confirmed that the voltage differences between two superconducting units of the current-limiting part were decreased. This is because of the improvement of inhomogeneous critical current behavior between the superconducting units according to the increase of external magnetic field.

• Korean Journal of Adult Nursing
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• v.18 no.4
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• pp.632-641
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• 2006

Purpose: The purposes of this study were to analyze the core nursing interventions that are used in the medical and surgical units, and to present the basic data that can be applied in clinical fields. Method: The data was collected from 353 nurses of the medical and surgical units from Jan. 2005 to Dec. 2005, using the database of nursing process record system used at a tertiary hospital. Results: 190 interventions were performed in the medical units, with 21 core nursing interventions. 198 interventions were performed in the surgical units, with 16 core nursing interventions. There were 11 common core nursing interventions. Conclusion: The results revealed that the ratio of physiological interventions and the interventions related to safety were high. The interventions were classified according to one's field of specialization, together with the common interventions were also being performed. According to the changes in the demands of consumers, there was also increases in the performance of 'pain management' and 'fall prevention.' We expect that this study will allow for the performance of standardized interventions, and that it will be helpful in the role of the experienced nurse, and in the approach to the nursing specialty.

• Architectural research
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• v.19 no.4
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• pp.101-108
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• 2017

The use of the air conditioner is increasing due to the rise of the outdoor temperature during summer, and the problems of the fire and the cooling performance deterioration are caused due to lack of maintenance of the outdoor unit. In particular, overall performance of cooling system and efficiency in outdoor units have been degraded due to an intake of high-temperature outdoor air thereby increasing cooling energy and operating cost. Thus, this study aimed to increase efficiency of outdoor units by evaporating and cooling intake air through mist spray at the intake port surface in the outdoor unit. The measurements results showed that total power consumption of misting outdoor unit compared to that of conventional outdoor units was reduced by 21% approximately, and total power consumption of the entire system including pump was reduced by 16.7%. In addition, the operating cost including water use was reduced by 13.5% approximately. In summary, if a mist-spray nozzle kit is installed in air-cooled outdoor units, the reduction in the usage of cooling energy and operating cost will be achieved without replacement of existing cooling systems or a large scale of repairs.

• Journal of Power Electronics
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• v.8 no.4
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• pp.291-300
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• 2008

In this paper power system and drive-train for omni-directional autonomous mobile robots with multiple energy storage units are presented. Because in proposed system, which is implemented in soccer robots, the ability of power flow control from of multiple separated energy storage units and speed control for each motor are combined, these robots can be derived by more than one power source. This capability, allow robot to diversify its energy source by employing hybrid power sources. In this research Lithium ion polymer batteries have been used for main and auxiliary energy storage units because of their high power and energy densities. And to protect them against deep discharge, over current and short circuit, a protection circuit was designed. The other parts of our robot power system are DC-DC converters and kicker circuit. The simulation and experimental results show proposed scheme and extracted equations are valid and energy management and speed control can be achieved properly using this method. The filed experiments show robot mobility functions to perform the requested motion is enough and it has a high maneuverability in the field.

• Journal of the Korean Society of Clothing and Textiles
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• v.40 no.1
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• pp.69-80
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• 2016

This study investigated the National Competency Standards (NCS) of fashion planning to compare the fashion planning curriculum of domestic universities and colleges with NCS as well as suggest ways to activate the application of NCS to fashion planning education. Qualitative research was employed based on references from the old and new homepages of NCS as well as fashion planning related subjects of domestic universities and colleges. The results are as follow. First, fashion planning NCS was composed of 10 competency units. Competency units were composed of competency unit elements and performance criteria. The levels of the competency units and the competency unit elements were suggested based on 8 stages. There were significant differences in the content of competency units and the level of competency units between the old version and the revised version of fashion planning NCS. Second, considerable fashion planning related subjects seemed at a higher level than the function level of recent college graduates. There were also omitted subjects which were required for recent college graduates. Third, the requirements for the reorganization of curriculums and education systems as well as the cooperation among industry, colleges, universities, and development part of NCS were suggested for the activation of NCS based education and the validation of NCS.

• Journal of Korean Academy of Nursing Administration
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• v.22 no.2
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• pp.178-188
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• 2016

Purpose: This study was performed to investigate the effect of work environment on nursing performance and the effect of job satisfaction and empowerment on nurses performance in hemodialysis units. Methods: Participants in this study were 206 nurses from 22 hemodialysis units in local clinics, general and university hospitals in two metropolitan areas. The work environment, nursing performance, job satisfaction and empowerment of the participants were measured using four self-report questionnaires. Data were analyzed using SPSS/WIN 18.0. Results: Nursing performance correlated significantly with work environment, job satisfaction, and empowerment in the participants. Predictability of work environment for nursing performance was 28%. Job satisfaction and empowerment showed complete mediating effects, but not moderating effects in the relationship of work environment and nursing performance in the participants. Conclusion: Findings indicate that work environment is an important variable affecting nursing performance in nurses in hemodialysis units and that job satisfaction and empowerment are mediating variables in the relationship of work environment and nursing performance in nurses in hemodialysis units. Improvements in the work environment are needed to induce the high job satisfaction and empowerment that can lead to improvement of nursing performance.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.27 no.10
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• pp.506-514
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• 2015

During the progression of this study, we visited 17 medical institutions. These medical institutions underwent inspection for facility eligibility of national inpatient isolation units to care for patients. Seventeen consultation meetings were held to gather expert opinions, and conferences were held with the medical institutions and local levels of government. Based on these facts, we established a field application model of the criteria of safety-management and conducted a study on this method in order to create more scientific and systematic safety-management criteria including criteria regarding facilities maintenance and methods of equipment inspection. According to an analysis on the 17 medical institutions examined, facility eligibility of 17 national inpatient isolation units was found to be 78.3% on average. Through analysis of the present domestic and foreign conditions of medical institutions, we proposed improvements for when remodeling becomes necessary and established criteria for safety-management in national inpatient isolation units for the care of patients in accordance with the domestic healthcare system.