• International Journal of Fluid Machinery and Systems
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• 제9권1호
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• pp.1-16
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• 2016

Behaviors of surges appearing near the stall stagnation boundaries in various fashions in systems of a single-stage compressor and flow-path systems were studied analytically and were tried to put to order. Deep surges, which enclose the stall point in the pressure-mass flow plane, tend to have either near-resonant surge frequencies or subharmonic ones. The subharmonic surge is a multiple-loop one containing, for example, in a (1/2) subharmonic one, a deep surge loop and a mild surge loop, the latter of which does not enclose the stall point, staying only within the stalled zone. Both loops have nearly equal time periods, respectively, resulting in a (1/2) subharmonic surge frequency as a whole. The subharmonic surges are found to appear in a narrow zone neighboring the stall stagnation boundary. In other words, they tend to appear in the final stage of the stall stagnation process. It should be emphasized further that the stall stagnation initiates fundamentally at the situation where a volume-modified reduced resonant-surge frequency becomes coincident with that for the stagnation boundary conditions, where the reduced frequency is defined by the acoustical resonance frequency in the flow-path system, the delivery flow-path length and the compressor tip speed, modified by the sectional area ratio and the effect of the stalling pressure ratio. The real surge frequency turns from the resonant frequency to either near-resonant one or subharmonic one, and finally to stagnation condition, for the large-amplitude conditions, caused by the non-linear self-excitation mechanism of the surge.

• 한국생활과학회지
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• 제18권2호
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• pp.477-489
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• 2009

In this study, elementary school students' satisfaction in school food service and their dietary behaviors were investigated, based on survey performed on 453 elementary school students (233 boy and 221 girl students) in the range of 4th grade to 6th grade. 85.7% of the students had agreed to the necessity of school food service. The point of overall satisfaction in school food service was $3.53{\pm}0.83$. The highest satisfactory factor was menu of school food service$(3.64{\pm}0.77)$, while the lowest satisfactory was service$(3.41{\pm}0.85)$. The point of boy students' satisfaction in menu(p<0.05), sanitation & facility(p<0.001), and service(p<0.05) of school food service was higher than girl students'. The students' responses indicate that: 36.9% of the students wash their hands before meal; 19.9% of the students brush their teeth after meal; 36.1% of the students arrange their table after meal; 22.1% of the students do not disturb others during their meal. 46.5% of the students always have meals pleasantly, while 22.8% of the students have meals without any particular feelings. 74.6% of the students always eat proper amount. 51.3% of the students turned out to eat snacks between meals out of hunger (50.7%) once a day with their friends(59.8%). 61.8% of the students believe that their tastes are affected by their parents and 57.8% of the students are aware of their unbalanced diet to be corrected. In summary, to provide satisfactory school food service for students, the improvements in the facilities and hygienic standard and the taste and nutrition have to be preceded, and the students have to be advised about the healthy dietary habits and the hazard of biased diet.

• 한국도서관정보학회지
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• 제4권
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• pp.91-111
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• 1977

The view point of the library is treated as a first subject. This study is scheduled to construct, as a experimental study, the system of the Library Science. The study of this fields is called upon greatly because the trial to understand library as a socio-cultural phenomenon did not study as many times. As a result of the study, library is defined as ${\ulcorner}Structural Formation of Inquirying Behavior{\lrcorner}$. Not only technique and actual proof are possible in this study but also this definition is technical definition to indicate the main phenomenon of Librarial Behavior. This schedule represent the trial to define Library Behavior which could anticipate and fabricate when we analyze this definition First, we can find out, first of all, the researching behavior among the human behaviors and then human behavior has the condition of practice. At last, researching behavior can not have any result when it is a natural situation, it has only the meaning when it is guided by an obvious intention. The object of the library is just this human behavior. Second, Formation permits the guidance and self-control at the same-times. The answer about what we find out and practice make it possible the act of guidance. This guidance can't burden any subject but permit the people to result his own researching behaviors. He can save his activities, his own researching behaviors by the result of it. Third, The statematical means efficient performances, and them efficient performances is impossible, here is 'discoveries' of behavior itself. The system of the library is the formation of the relation between the accumulated civilizations and accumulated civilizations. As the definitions of the above mentions, library has the big abilities to the creation and succession of the civilization. As the contemporary view-points, there are some questions about the above described definition can meet it of the library. When we frame the science of library as the learning systems, we can't but the library as this definitions.

• 대한치과기공학회지
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• 제34권2호
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• pp.179-199
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• 2012

Purpose: This study was conducted to prepare the fundamental data on oral hygiene of the elderly and to assess the behavior of oral hygiene, subjective oral health, oral health problem among the elderly, and to contribute to successful enhancement of life in their declining years. Methods: The author surveyed the behavior of oral hygiene, subjective oral health, oral health problem to 192 elderly at a health center of Busan using structured self- administered questionnaire from Nov. 2nd 2009 to Feb. 10th 2010. Collected data were analysed by SPSS WIN 18.0 statistical program for frequency, percentage production, ${\chi}^2$ (Chi-square) verification, t-test, One-way ANOVA, Logistic Regression. Results: The distribution of total subjects by oral health behaviors were 56.8% for "have ever trained how to tooth brushing", 76.6% for "correctly performed tooth brushing by himself ", 71.8% for "tooth brushing a day is two times and less", 87.5% for "it doesn't tooth brushing in meals and after" and 53.6% for "it doesn't use the facility for oral health", respectively. The distribution of total subjects by the state of perceived oral health were 51.0% for "feel the oral discomfort", 51.6% for "feel the comfortable chewing on starchy food", respectively. The mean point of perceived oral health by general characteristics of total subjects were statistically significant difference in sex, type of medical insurance, smoke, exercise, and chronic disease. The mean point of perceived oral health by oral health behaviors of total subjects were statistically significant difference in educational experience on tooth brushing, recognition for tooth brushing by himself, tooth brushing a day, and tongue cleaning. The risk factors of perceived oral health were type of medical insurance and chronic disease in general characteristics, tooth brushing in meals and after and tooth brushing a day, and tongue cleaning in oral health behaviors. Conclusion: The author recommend to the prevention of chronic disease, carry out the tooth brushing in meals and after, three times and over tooth brushing a day and tongue cleaning for oral health. and the author consider that it need to prepare the active countermeasure to oral health such as reeducation for oral health and supply to the tongue cleaner.

• 융합정보논문지
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• 제11권1호
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• pp.261-267
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• 2021

본 연구는 트랜드에 민감하고 취업 등 외모에 관심이 어느 때보다 많은 여대생들을 대상으로 하여 여대생들의 뷰티 라이프스타일 행동이 미용가치추구와 화장품구매행동에 미치는 영향을 알아보고 미용산업 중 여대생들의 소비시장을 파악하고 미용산업 발전에 기여하고자 한다. 본 연구를 위한 자료수집은 모두 328명을 대상으로 실시하였으며 설문조사는 자기평가방식을 사용하였고, 5점 리커트척도와 선다형을 사용하였다. 분석결과는 다음과 같다. 첫째, 뷰티 라이프스타일 행동이 미용가치추구에 미치는 영향에 대한 회귀분석 결과, 네일행동, 메이크업행동, 다이어트행동, 성형행동, 쇼핑행동은 p<0.01에서 유의한 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 화장품구매행동에 따른 미용가치추구의 차이에 대한 결과, 화장품구매횟수가 통계적으로 유의한 것으로 나타났다. 셋째, 뷰티 라이프스타일 행동 관심도에 따른 화장품구매행동의 차이에 대한 결과, 화장품구매횟수, 화장품구입비는 통계적으로 유의한 것으로 나타났다.

• 대한지역사회영양학회지
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• 제14권2호
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• pp.236-244
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• 2009

Dietary therapy is a basic and emphasized treatment for diabetes. Several clinical studies have shown that diet can play a major role in preventing and managing diabetes. The purposes of this study were to evaluate the dietary behavior and to find solutions to barriers of diabetes mellitus patients. From February to July in 2007, questionnaires were distributed to one hundred and ten patients who were diagnosed DM by physicians and excluded first coming out-patients. One hundred and three data were used for statistical analysis using SPSS/Win 12.0. The main results of this study included the following: To measure dietary behaviors and barriers, a five point scale was used with the following labels: 'strongly yes', 'yes', 'fair', 'no', 'strongly no'. Thirteen dietary behaviors related to diabetes were grouped into the following 4 factors using factor analysis; 'taste control factor', 'blood glucose influence factor', 'practice volition factor', and 'exercise factor'. The mean scores of 4 factors were 3.88, 3.48, 3.55, 3.21, respectively. The 'taste control behaviors' score of subjects who had practiced diet therapy(4.00) was higher than those who had not practiced diet therapy(P<0.05). The 'blood glucose influence behaviors' score of subjects who had nutrition education(3.59) was higher than those who had no nutrition education(P<0.05) and subjects who had practiced diet therapy showed higher score(3.59) than those who had not practiced diet therapy(P<0.05). 'Exercise behaviors score' of subjects who were over 60(3.59) was the lowest(P<0.05). Subjects who had nutrition education showed higher 'exercise behaviors' scores(3.38) than those who had no nutrition education(P<0.05). Subjects who had practiced diet therapy showed higher 'practice volition behaviors' scores(3.72) than those who had not practiced diet therapy(P<0.001). Subjects who were over weight showed the highest 'practice volition behaviors' scores(3.78) concerning BMI(P<0.05). In conclusion, this study expected that Nutrition educators(Dietitian) applied to patient effective nutrition education and counseling through evaluation of Dietary behaviors and barriers considered management types and ecological factors of diabetes patients. Also diabetic patients were easy to change dietary habits because they formed behaviors through education and counsel and there were positive effects in their blood glucose control through removing barriers related to dietary therapy.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 춘계학술대회 논문집
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• pp.328-331
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• 2009

This paper presents the behaviors of transient and conventional grounding impedances of a 30m counterpoise according to the injection point of lightning impulse currents. As a result, the trend of the conventional grounding impedances measured as a function of risetime of impulse current is similar to the transient grounding impedance of counterpoise. The injection point of impulse current greatly influences on the transient grounding impedance characteristics of counterpoise. The transient grounding impedances strongly depend on the injection point and the rising time of impulse current and the soil characteristics.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.317-324
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• 2006

Performance-based design concept is needed to evaluate the seismic capacity of building. In this study, the method estimating the performance point of the spatial structures based on capacity spectrum method (CSM) is proposed. And for efficient evaluation for the performance point of the spatial structures, the algorithm to convert spatial structural system to ESDOF system is simulated Its efficiency is confirmed by comparing with time history analysis of full model. And dynamic behaviors of spatial structures are examined by using this method. At last, evaluation of structural performance according to variation of stiffness after plastic deformation on the substructures is carried out.

• 한국공간구조학회:학술대회논문집
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• 한국공간구조학회 2006년도 춘계 학술발표회 논문집 제3권1호(통권3호)
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• pp.49-57
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• 2006

Performance based seismic design is a very efficient method in evaluating the seismic capacity of building. In this study, the method estimating the performance point of the spatial structures based on capacity spectrum method(CSM) is proposed. And for efficient evaluation for the performance point of the spatial structures, the algorithm to convert spatial structural system to ESDOF system is proposed. Its efficiency is confirmed by comparing with time history analysis of full model. And dynamic behaviors of spatial structures are examined by using this method. At last, evaluation of structural performance according to variation of stiffness after plastic deformation is carried out.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2008년도 추계학술대회 논문집
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• pp.69-72
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• 2008

This paper presents the transient and conventional grounding impedance behaviors of large grid grounding system associated with the injection point of impulse current The measurement methods consider two possible errors in the grounding-system impedances: (1) ground mutual resistance due to current flow through ground from the ground electrode to be measured to the current auxiliary, (2) ac mutual coupling between the current test lead and the potential test lead The test circuit was set to reduce the error factors. The transient grounding impedance depends on the rise time and injection point of impulse current It is effective that grounding conductor is connected to the center of the large grid grounding system.