• 제목/요약/키워드: scale effect

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농촌 지역에서 유입 유량이 소규모 하수처리장 처리 효율에 미치는 영향 (Effect of sewage flow on treatment efficiency of small scale wastewater treatment plant in rural community)

  • 임지열;길경익
    • 한국습지학회지
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    • 제18권3호
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    • pp.267-274
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    • 2016
  • 농촌 지역 하수도 보급은 하천, 호소 및 습지와 같은 수계 수질 보호를 위해서 반드시 필요하다. 또한 안정적인 소규모 하수처리장 운영을 위해서는 유입 유량과 농도의 변화가 큰 소규모 하수도 특성을 고려해야 한다. 본 연구에서는 봉화군 18개의 소규모 하수처리장 운전 결과를 통해 유입유량비 (유입 유량 / 설계 유량) 특성, 소규모 하수처리장 처리 효율에 미치는 영향과 적정 유입유량비 산정에 관한 연구를 수행하였다. 분석 결과 유입유량비는 여름철에 가장 높은 것으로 나타난 반면, 유입 하수 농도는 가을철과 겨울철에 높은 것으로 나타났다. 유입유량비가 증가할수록 처리 효율이 증가하는 경향을 보였으며, 영양염류 처리 효율이 유기물과 부유물질 처리 효율에 비해 민감한 영향을 받는 것으로 나타났다. 안정적인 소규모 하수처리장 처리 효율을 위해서는 유입유량비 0.8 이상을 유지해야 할 것으로 판단된다.

아동의 학습된 무력감과 관련 변인간의 인과관계:아동의 자기능력지각, 스트레스, 모의 양육태도를 중심으로 (The Causal Relations of Children's Learned Helplessness and Related Variables:Focusing on the Children's Perception of Self-Competence, Stress and Mother's Childrearing Attitudes)

  • 이경님
    • 한국생활과학회지
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    • 제8권2호
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    • pp.227-243
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    • 1999
  • The purpose of this study was to analyze a causal relations of children's learned helplessness, stress, perception of self-competence and mother's childrearing attitudes. The subjects were 370 of 4th and 6th grade in elementary school and the second grade in junior high school in Busan and their's mothers. The instruments used for this study were learned helplessness scale, stress scale, self-perception profile for children, and childrearing attitude scale. The data was analyzed with pearson's correlation, multiple regression and path analysis. The major findings of this study were as follows : 1. Children's global self-worth, social self, age and mother's controlling childrearing attitudes predicted children's stress. 21% of the variance of children's stress was explained by these variables. 2. Children's stress, global self-worth, academic and social self predicted children's learned helplessness. 54% of the variance of children's learned helplessness was explained by these variables. 3. 1) Global self-worth was the first contribution and had a indirect effect through stress as well as a direct effect on children's learned helplessness. 2) Children's stress and academic self had direct effect on children's learned helplessness. 3) Children's social self had a indirect effect through stress as well as a direct effect on children's learned helplessness. 4) Mother's affectionate childrearing attitudes had indirect effect through academic, and social self and global self-worth on children's learned helplessness. Mother's controlling childrearing attitudes had indirect effect through stress on children's learned helplessness. Children's age had a indirect effect through global self-worth and stress and children's sex had a indirect effect through social self on children's learned helplessness.

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간호조직에서 변혁적 리더쉽과 조직몰입의 관계에 대한 연구;성격특성의 조절효과를 중심으로 (A Study on the Relationship between Transformational Leadership and Organizational Commitment in Nursing Organization;Focusing on Moderating Effect of Personal Characteristics)

  • 김명숙;박영배
    • 간호행정학회지
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    • 제7권1호
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    • pp.41-51
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    • 2001
  • Today's health care environment is rapidly changing and nurse administrators' leadership styles need to identify in nursing organization to achieve organizational objectives. By Bass(1985), transformational leadership stimulates the subordinates to be creative and achieve organizational objectives and is related to job satisfaction, job involvement, productivity, and organizational commitment. Transformational leadership process consists of charisma, intellectual stimulation, individual consideration. The purpose of this study is to identify the effect of transformational leadership and personal characteristics on nurses' organizational commitment. The subjects for this study consisted of 594 nurse from 8 University Hospitals and General Hospitals. The data were collected by personal characteristics scale, transformational leadership scale, and organizational commitment scale. The factor analysis, Cronbach's alpha analysis, Pearson correlation analysis, multiple regression analysis and hierarchical multiple regression analysis were used for the statistical method. The results of this study were found that (1) charisma dimension of transformational leadership has positive influence on nurses' organizational commitment; but another two dimensions(intellectual stimulation and individualized consideration) did not showed significant effect on organizational commitment (2) nurses' personal characteristic(internal locus of control) moderated the effect of transformational leadership on organizational commitment.

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아동의 또래괴롭힘과 관련변인간의 인과관계 -아동의 행동문제, 내외통제소재와 어머니의 양육행동을 중심으로 - (The Causal Relations of Children′s Behavior Problems, Locus of Control and Mother′s Childrearing Behavior)

  • 이경님
    • 대한가정학회지
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    • 제39권8호
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    • pp.37-52
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    • 2001
  • The purpose of this study was to explore the relationships of mother's childrearing behavior, children's behavior problems, locus of control and peer victimization. The subjects were 360 children of 4th and 6th grade and their mothers. The instruments were Peer Victimization Scale, CBCL, Locus of Control Scale for Children, Childrearing Behavior Scale. The major findings of this study were as follows; (1) The type of peer victimization had a significant difference between girls and boys. That is, boys were more focused on overt victimization than girls. There was no significant gender difference in relational victimization, And there was no significant grade difference in overt and relational victimization. (2) Mother's rejection-restriction childrearing behavior, children's social withdrawal behavior problems, extemal locus of control predicted children's peer victimization. 24% of the variance of children's peer victimization was explained by these variables. (3) Mother's rejection-restriction childrearing behavior was the first contribution factor and had a direct and indirect effect through children's locus of control on children's peer victimization. And children's social withdrawal behavior problems was second contribution factor and had a direct effect on children's peer victimization. Children's locus of control had a direct and indirect effect through children's social withdrawal behavior problems on children's peer victimization. Mother's warmth-acceptance and permissiveness-nonintervention childrearing behavior had indirect effect through children's locus of control on children's peer victimization.

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극하근과 대원근에 적용한 전침이 견관절 기능 개선 및 통증 경감에 미치는 영향 (Effect of the Electro-acupuncture Stimulation into the Infraspinatus and the Teres Major for the Shoulder Function Improvement and Pain Reduction)

  • 장원석;배성수
    • The Journal of Korean Physical Therapy
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    • 제19권6호
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    • pp.43-47
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    • 2007
  • Purpose: This study examined the effect of electro-acupuncture stimulation of the infraspinatus and teres major on the shoulder function reduction. The subjects consisted of 20 female patients with a shoulder dysfunction. Methods: The 20 female patients with shoulder dysfunction participated voluntary in this research. 10 minute electro-acupuncture stimulation (frequency: 5Hz, Intensity: below the pain threshold) with Infra-red therapy, 3 times per week given to the patients' Trigger point of the infraspinatus and teres major. The Visual Analog Scale (VAS), Apley's Scratch Test and Global Perceived Effect Scale (GPES) were examined before alter six applications. Results: There was a significant decrease in the VAS (p<0.05) and Apley's Scratch Test (p<0.05). In addition, there was statistically significant increase in the Global Perceived Effect Scale (p<0.05). Therefore, the infraspinatus and teres major is a very important muscle for the shoulder function. Conclusion: This data will be used to develop a treatment method for patients with a shoulder dysfunction. These results suggest that the electro-acupuncture stimulation into the infraspinatus and the teres major Trigger point is an effective intervention for patients with shoulder dysfunction and pain.

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불안정애착과 주관적 안녕감의 관계: 탈중심화와 자기자비의 매개효과 (The Relationship between Unstable Attachment and Subjective Well-Being: Mediating Effect of Decentering and Self-Compassion)

  • 김용희
    • 스트레스연구
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    • 제26권4호
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    • pp.290-295
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    • 2018
  • 본 연구는 불안정 애착과 주관적안녕감의 관계에서 탈중심화와 자기자비의 매개효과를 알아보기 위하여 실시하였다. 이를 위해 255명의 대학생을 대상으로 불안정애착척도, 주관적 안녕감척도, 탈중심화 척도, 자기자비척도를 실시하여 분석하였다. 매개회귀분석 결과는 다음과 같다. 첫째, 불안정애착은 주관적 안녕감, 탈중심화, 자기자비와 유의한 부적 상관을 나타냈다. 둘째, 불안정애착이 주관적 안녕감에 미치는 영향에서 탈중심화는 부분매개효과를 나타냈다. 셋째, 불안정애착이 주관적 안녕감에 미치는 영향에서 자기자비는 완전매개효과를 나타냈다. 본 연구결과에 근거하여 논의와 제언을 기술하였다.

A System Dynamics Model of Alternative Fuel Vehicles Market under the Network Effect

  • Kwon, Tae-Hyeong
    • 한국시스템다이내믹스연구
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    • 제8권2호
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    • pp.5-23
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    • 2007
  • According to the system dynamics model of this study, if there is a significant network effect on vehicle operating costs, it is difficult to achieve the shift to AFV even in the long term without a policy intervention because the car market is locked in to the current structure. Network effect can be caused by an increasing return to scale in fuel supply sector as well as in maintenance service sector. It is also related to the fact that the reliability and awareness of consumers on new products increases with the growth of the market share of the new products. There are several possible policy options to break the 'locked in' structure of car market, such as subsidy on vehicle price (capital cost), subsidy on fuel (operating cost) and niche management policy. Combined policy options would be more effective than relying on a single policy option to increase the market share of AFV.

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Effect of Flow Liners on Ship′s Wake Simulation in a Cavitation Tunnel

  • Lee, Jin-Tae;Kim, Young-Gi
    • Journal of Hydrospace Technology
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    • 제1권1호
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    • pp.41-56
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    • 1995
  • Flew control devices, such as flow liners, are frequently introduced in a cavitation tunnel in order to reduce the tunnel blockage effect, when a three-dimensional wake distribution is simulated using a complete ship model or a dummy model. In order to estimate the tunnel wall effect and to evaluate the effect of flow liners on the simulated wake distribution, a surface panel method is adopted for the calculation of the flow around a ship model and flow liners installed in a rectangular test section off cavitation tunnel. Calculation results on the Sydney Express ship model show that the tunnel wall effect on the hull surface pressure distribution is negligible for less than 5% blockage and can be appreciable for more than 20% blockage. The flow liners accelerate the flow near the afterbody of the ship model, so that the pressure gradient there becomes more favorable and accordingly the boundary layer thickness would be reduced. Since the resulting wake distribution is assumed to resemble the full scale wake, flow liners can also be used to simulate an estimated full scale wake without modifying the ship model. Boundary taper calculation should be incorporated in order to correlate the calculated wake distribution with the measured one.

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사회봉사 교과목 수강전후 간호학생들의 자아실현 비교연구 (A Study on the Changing in Self-actualization of Nursing College Students after a Voluntary Program)

  • 박후남;최영애
    • 한국간호교육학회지
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    • 제5권2호
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    • pp.285-299
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    • 1999
  • The Effect of Curriculum with voluntary program on Self-Actualization in Nursing Students. The purpose of this study was to identify the effect of the voluntary program experience with curriculum on self-actualization in nursing college students and to guide the desirable voluntary activity of college students. The research design utilized in this study was one group pretest-posttest design. The data were gathered two times with self-actualization test. First data were gathered before voluntary activity. And second data were gathered after instruction and five times voluntary activity. The data were analized by frequency, t-test, paired t-test and ANOVA using the SAS program. The results were as follows: The scores of self-actualization in nursing students belonged to normal range. Before voluntary activity, the scores were significantly higher than standardized group in Nature of Man, Constructive Scale (P<.001), and the scores were significantly lower than standardized group in Feeling Reactivity Scale(P<.05) and Capacity for Intimate Construct Sscale (P<.001). After the activity the scores were significantly higher than standardized group in Self Actualizing Values Scale(P<.001), Existentiality (P<.01), Spontaneity Scale (P<.001). Self Acceptance Scale(P<.05) and Nature of Man, Constructive Scale (P<.001). After the activity the scores were significantly increased more than before the activity in Inner Directed Scale (P<.001). Self Actualizing Values Scale (P<.001), Feeling Reactivity Scale (P<.001), Capacity for Intimate Construct Sscale (P<.001). Spontaneity Scale (P<.01), Time Competent Scale (P<.05) and Existentiality (P<.05). And the scores were not significantly increased more than before the activity in Self Regard Scale, Self Acceptance Scale and Nature of Man, Constructive Scale. The results of this study showed that voluntary activities were effective self-actualization. So, it is thought that voluntary program is necessary in the curriculum for nursing college students. This study suggests as follows : 1) It is necessary to inspect the self-actualization test after various experience of voluntary activity in college students. 2) It is necessary to grope the plans to activate the social service programs. 3) It is necessary to study continious and voluntary social service of college students.

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외국인직접투자, 경제성장, 환경규제의 관계분석 : 규모효과와 기술효과를 중심으로 (The Linkage of Foreign Direct Investment, Economic Growth, and Environmental Regulations : Scale Effect and Technique Effect)

  • 김광욱;강상목
    • 자원ㆍ환경경제연구
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    • 제18권3호
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    • pp.523-544
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    • 2009
  • 본 연구는 목적은 내생적 환경정책모형(endogenous environmental policy)에 기초하여 외국인직접투자(foreign direct investment), 경제성장, 환경규제의 상호관계를 실증적으로 분석하는 것이다. 외국인자본비율의 1% 증가는 0.044%(고정효과), 0.047%(확률효과)의 경제성장효과를 유발하였으며, 노동자 1인당 생산량의 1% 증가는 2.038%(고정효과), 1.890%(확률효과)의 환경규제강화를 유도하는 것으로 계측되었다. 그러나 생산 과정에 있어 강력한 환경규제가 기술혁신의 유인으로 작용한다는 포터의 가설(Porter's theory)을 지지할 만한 실증결과는 보여주지 못하였다. 또한 2개의 대기오염물질 (NOx, $CO_2$)을 기준으로 규모효과(0.0119, 0.0172)가 기술효과(-0.0048, -0.0007)보다 크게 추정되었다. 이는 국제사회의 꾸준한 노력에도 불구하고 더욱 적극적인 환경보호를 위해 각국의 공공지출액을 증액시킬 필요성이 있음을 의미한다.

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