• International Journal of Fluid Machinery and Systems
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• v.7 no.3
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• pp.110-124
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• 2014

Surge phenomena in the zone of reduced speeds in a system of a nine-stage axial flow compressor coupled with ducts were studied analytically by use of a surge transient simulation code. Main results are as follows. (1) Expansion of apparently stable, non-surge working area of the pressure vs. flow field beyond the initial stage-stall line was predicted by the code in the lower speed region. The area proved analytically to be caused by significantly mismatched stage-working conditions, particularly with the front stages deep in the rotating stall branch of the characteristics, as was already known in situ and in steady-state calculations also. (2) Surge frequencies were found to increase for decreasing compressor speeds as far as the particular compressor system was concerned. (3) The tendency was found to be explained by a newly introduced volume-modified reduced surge frequency. It suggests that the surge frequency is related intimately with the process of emptying and filling of air into the delivery volume. (4) The upstream range of movement of the fluid mass having once passed through the compressor in surge was found to reduce toward the lower speeds, which could have caused additionally the increase in surge frequency. (5) The concept of the volume-modified reduced surge frequency was able to explain, though qualitatively at present, the behaviors of the area-pressure ratio parameter for the stall stagnation boundary proposed earlier by the author.

• Korean journal of food and cookery science
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• v.33 no.3
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• pp.342-352
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• 2017

Purpose: The purposes of the study were to evaluate dietitian's practices for sustainability management and identify barriers of sustainability management at school foodservice. Methods: A total of 220 dietitians working in Daejeon and Chungnam area were surveyed. 187 responses were analyzed for the study. Data were analyzed using SPSS Windows. Results: The respondents were 36% in their 20 s, 38% in their 30 s, 39.6% in elementary schools, 33.7% in middle schools and 26.4% in high schools. Among dietitian's practices for sustainability management, the item with the highest self-evaluation was purchase eco-friendly food (3.75). The category with the highest score was procurement (3.52), by waste management (3.48), production (3.39), menu management (3.36), facility and energy management (3.20), personnel management (3.18), and nutrition education (3.04). In the area of menu management, production management, facility and energy management, nutrition education, and personnel management, scores of elementary school working dietitians were the highest, followed by middle school and high school (p<0.001). The most perceived factor for barriers to sustainability management was principal's indifference to sustainability management (4.10 out of 5 points). ietitian's sustainability management practices and barriers showed a negative correlation. Conclusion: It is necessary to dietitians, employees, and principals' awareness about sustainability management in order to perform effective sustainable management school foodservice.

• Journal of the Korean Home Economics Association
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• v.36 no.9
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• pp.153-166
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• 1998

In this study commuter marriage was defined as a family in which working husband and wife, who have professional job having family orientation and job orientation, come and go lived separately for more than days a week for working in different region. This study examined the determinants of living separately the merits and demerits of commuter marriage, relation with family, family finance and household work for twelve case wives fitted for above definition, and the findings are as the following. The main cause of commuter marriage was wife's work place. The merits of commuter marriage were that wives can devote to their own increased time and that they had fresh feeling to their husbands. The demerit were mental burden to mother-in-laws and their mothers who take charge of home management and the high cost of living for double housekeeping. In the area of relation with family, they and their husbands call above one time per day for communication although they live separately for three or four days, do not insist on norms of living together, and overcome difficulties of commuter marriage well. In the area of family six couples used allowances method. They have high living cost like traffic expenses, telephone charges, and housing expenses because of double living. In the area of household work, they mainly manage family life with the help of household helpers like mother-in-laws or their own mothers.

• Nuclear Engineering and Technology
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• v.56 no.2
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• pp.485-497
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• 2024

Ring beam is the main anchorage zone of the tendons in the nuclear power prestressed concrete containment vessel (PCCV). Its safety is crucial and has a great influence on the overall performance of PCCV. In this paper, two half-scale ring beams were tested to investigate the mechanical performance of the anchorage zone in the PCCV under multidirectional pressure. The effect of working condition with different tension sequences was investigated. Additionally, a half axisymmetric plane model of the containment was established by the finite element simulation to further predict the experimental responses and propose the local reinforcement design in the anchorage zone of the ring beam. The results showed that the ultimate load of the specimens under both working conditions was greater than the nominal ultimate tensile force. The original reinforcement design could meet the bearing capacity requirements, but there was still room for optimization. The ring beam was generally under pressure in the anchorage area, while the splitting force appeared in the under-anchor area, and the spalling force appeared in the corner area of the tooth block, which could be targeted for local strengthening design.

• Journal of Nutrition and Health
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• v.19 no.6
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• pp.392-401
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• 1986

Various types of restaurants in Seoul city are a were assessed in terms of facilities equipped, and dining and kitchen space allocation. Facilities checklist was developed to evaluate the facilities condition of sampled restaurants. Subjective sample were randomly selected based on the distribution factors of areas, types and sizes. The facilities for the sanitary working environment were assessed as the insufficient condition. Also basic kitchen equipments and facilities, and restroom facitilities of restaurants were within the kitchen or dining room space allowance level. Space requirement and facilities standard models were developed for the guideline to improve the working environment.

• Journal of the Korean Home Economics Association
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• v.25 no.3
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• pp.83-94
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• 1987

The floor plan of the folk houses in Korean-Middle area was "-" type, "ㄱ" type and "double " type. The common terms of lifespaces were Anbang(안방), Wootbang(웃방), Cunnunbang(건넌방), Taechung(대청), Maru(마루), Buoak(부엌), Chungji(정지), Sarangbang(사랑방), Bongdang(봉당). 1) Anbang was basically a master room and was a family room. The function of another presented in Anbang was a space of the dying hour, the mourning decorums, and the memorial services. 2) Wootbang, Cunnunbang was terms that coming from the space position. Such spaces were the private rooms of children. 3) Sarangbang was basically the space of a reception of guests. 4) Buoak, Chungji were cooking and working space. Primarily, Buoak was the terms meaned Bootumk(부뚜막) in Chosun dynasty. 5) Maru, Tachung were terms of presented from side of construction. Specially, it was the chief space in family in Summer. 6) Bongdang was a terms of space that mean working areas, entry hall etc.working areas, entry hall etc.

• Journal of the Korean Home Economics Association
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• v.44 no.6 s.220
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• pp.15-22
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• 2006

The purpose of this study was to investigate the relationship between early childhood teacher's knowledge and protective practice on safety. The study subjects were 312 early childhood teachers working at kindergartens and day care centers in Seoul, Kyung-gi area. A modified questionnaire was based on that developed by Nam(2002). Data were analysed by t-test, One-way ANOVA, and Pearson's correlations. The results were as follows. First, there was a small but insignificant difference for safety knowledge in the teachers' teaching experiences, and working place, but no difference in attending safety education. Second, there were differences for safety practices in teaching experiences and working place. Third, teachers' safety knowledge was highly and positively correlated with safety practices. In conclusion, enhanced early childhood teacher' safety knowledge is needed for improved safety practice.

• Korean Journal of Occupational Health Nursing
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• v.29 no.1
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• pp.1-7
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• 2020

Purpose: The purpose of this study is to investigate the effect of work environment on health problems of nurses. Methods: The subjects of the study were 395 nurses who were wage workers among KWCS (Korean Working Conditions Survey) respondents in 2014. The work environments were measured by the KWCS questionnaire. Results: 48.5% of the 395 nurses had health problems. The prevalence of musculoskeletal diseases (34.7%) was the highest among all health problems. The ergonomic work environment was significantly related to musculoskeletal disorders, headache and eye strain, and fatigue. In addition, the increase in work-individual interface area was significantly related to fatigue. Conclusion: The work environment of nurses affects health problems. It is therefore important to develop strategies that improve the health problems of nurses by reducing ergonomic and psycho-social risk factors.

• Journal of the Korean Home Economics Association
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• v.32 no.2
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• pp.179-192
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• 1994

This study examines work and family life of married women and policy implications of the low class in Daegu area. Data were gathered from the use of face-to-face interview method from a sample of 564 married working women. And the political printed materials of family welfare policy(1988~1993) were analyzed. The major findings of this study can be summarized as follows: Most of the respondents remain unstable in their working situation with the double burden of a paid work and housework. Thus it is necessary for the government to implement family policies for married working women such as establichment of various child care centers study room for adolescence councelling center job-training center and dissemination of egalitarian sex-role attitudes. Finally it is suggested that the formulation of family net works be promoted for the effective utilization of local resources and family welfare programs.

• Journal of the Korean Institute of Rural Architecture
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• v.7 no.3
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• pp.76-83
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• 2005

According to the results of analyzing the formation enterprise of beautiful public latrines, which Chungcheongnamdo is promoting, the conclusions of this study are as follows. The design for construction form should be suitable well for the surrounding environment according to the installation place of public latrines. Construction scales and sanitary appliances should be decided according to the location, use personnel, use frequency, and user type of latrines. It is not desirable to decide working expenses on the basis of pyeong irrespective of construction scale. In the purchase of building sites, because the building sites owned by the nation or the public bodies are difficult to apply the related laws, it is difficult to construct public latrines as eternal facilities. Because the building sites owned by individuals are very expensive, the execution of enterprises is difficult. Therefore, it is necessary to simplify the administrative procedures and increase the working expenses.