• International Journal of Fluid Machinery and Systems
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• 제1권1호
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• pp.76-85
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• 2008

In order to extract micro hydropower in the very low specific speed range, a Positive Displacement Turbine (PDT) was proposed and steady performance was determined experimentally. However, the suppression of large pressure pulsation is inevitable for practical application of PDT. The objective of the present study is to reveal the mechanism and the characteristics of pressure pulsation in PDT by use of CFD and to suppress the pressure pulsation. Unsteady CFD analysis has revealed that large pressure pulsation is caused by large variation of rotational speed of the following rotor, while the driving rotor, which is output rotor, keeps constant speed. Here is newly proposed a 4-lobe helical type rotor which can reduce the pressure pulsation drastically and the performance prediction of new PDT is determined.

• 아시아태평양코퍼스연구
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• 제1권2호
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• pp.1-14
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• 2020

Previous work has shown that men both explain and value the act of explaining more than women, as explaining conveys expertise. However, previous studies are limited to English. We conducted an exploratory study to see if similar patterns are seen amongst Japanese speakers. We examined three registers of Japanese: conversational interviews, simulated speeches, and academic presentations. For each text, we calculated two measures: lexical density and the percentage of the text written in kanji. Both are indicators of expository language. Men produced significantly higher scores for the interviews and speeches. However, the results for the presentations depend on age and academic field. In fields in which women are the minority, women produce higher scores. In the field in which men are the minority, younger men produced higher scores but older men produced lower scores than women of the same age. Our results show that in academic contexts, the explainers are not necessarily men but rather the gender minority. We argue that such speakers are under social pressure to present themselves as experts. These results show that the generalization that men tend to explain more than women does not always hold true, and we urge more academic work on expository language.

• 한국심리학회지 : 문화 및 사회문제
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• 제10권3호
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• pp.37-59
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• 2004

이 연구는 한국 청소년의 학업성취과정에서 부모자녀관계가 어떠한 심리적 역동을 갖는가에 대한 분석을 주된 목적으로 한다. 부모자녀관계는 부모의 사회적 지원, 성취압력, 자녀에 대한 기대, 부모에 대한 죄송함과 존경심 지각을 포함했다. 이러한 부모자녀관계가 자녀의 심리특성으로서 자기조절학습효능감과 성취동기, 그리고 행동특성으로서 공부시간과 학업성적에 어떠한 영향을 미치는지 분석하였다. 동시에 학업성취과정에서 과거의 성취도가 어떠한 영향력을 갖는지에 대해서도 종단자료를 통해 분석하고자 했다. 1차 표집대상은 2개 초등학교 6학년 전체 961명이었으며, 그들이 중학교 1학년 시기가 되었을 때 7개 중학교에 분산된 856명이 2차 표집되었다. 그들이 중학교 3학년이 되었을 때 830명(남 411명, 여 419명)이 3차 표집되었고, 3차 표집대상 학생의 부모에게도 질문지를 실시하여 아버지 722명과 어머니 767명이 표집되었다. 3차 표집대상 중에서 학생과 아버지 어머니 자료가 모두 수집된 694명의 자료가 이 연구를 위한 최종분석대상이었다. 분석결과는 다음과 같다: 1) 과거의 학업성취도는 현재의 학업성적을 결정하는 가장 영향력있는 변인이었으며, 자기조절학습효능감과 공부시간에도 영향을 미쳤다. 2) 부모에 대한 죄송함은 성취동기를 높였으며, 성취동기는 공부시간에 직접적으로 관련되었다. 3) 부모에 대한 존경심은 자기조절학습효능감을 증진했으며, 높아진 효능감은 학업성적을 향상시켰다. 4) 부모의 사회적 지원은 자녀의 자기조절학습효능감과 성취동기를 증진했으며, 부모의 성취압력은 성취동기를 높였다. 5) 자녀에 대한 부모의 기대는 자녀의 학업성적에 정적인 영향이 있었다. 6) 자기조절학습효능감은 학업성적에 정적인 영향을 주었다. 이러한 결과로부터, 과거 학업성취가 현재 학업성취를 결정하는 가장 중요한 예언변인이며, 부모자녀관계와 자기조절학습효능감도 청소년의 학업성취에 영향을 주는 중요한 변인임이 확인되었다.

• Human Ecology Research
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• 제52권1호
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• pp.43-53
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• 2014

The purpose of this study was to 1) investigate the characteristics of burnout of Korean elementary school students and 2) develop and validate the Korean Academic Burnout Scale-Elementary School Students (KABS-ESS). Fifty-one behavioral descriptions of burnout extracted through a preliminary survey, focus group interview, and literature review were administered to a sample of 531 elementary students of the 4th to 6th grade in Gyeonggi Province. The results of an exploratory factor analysis indicated that the structure of the burnout of Korean elementary school students consists of seven factors (i.e., inefficacy, avoidance, cynicism, emotional exhaustion, physical exhaustion, antipathy and cognitive exhaustion), and this structure of final 28 items was confirmed by the confirmatory factor analysis. The KABS-ESS showed a correlation of .771 with a representative academic burnout scale, Maslach Burnout Inventory-Student Survey, and -.561 with the academic engagement scale, indicating that both convergent and discriminant validities were confirmed. Furthermore, all fit indices of the structural equation model of the Schaufeli and Bakker's job demands-resources in an academic setting were satisfactory, and the possibility of the validity generalization of the model was supported. The demand variables predicting academic burnout and engagement were academic overload and parental pressure, while self-resilience, self-regulated learning strategies, and parental and the teacher's support were identified as the resource variables. Lastly, the implications and future direction of the present study were discussed.

• 대한간호학회지
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• 제49권4호
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• pp.495-504
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• 2019

Purpose: Nursing students experience a high degree of perceived stress during skills training. The resulting academic sentiment is worthy of research. This study examined the learning motivation as a mediator in the association between perceived stress and positive deactivating academic emotions in nursing students undergoing skills training. Methods: A survey was conducted on 386 third-year undergraduate nursing students at a university in Changchun, China, in 2017. The survey included the items on perceived stress, learning motivation during nursing skill training, and general academic emotion. There were 381 valid responses (response rate=98.7%). Based on the results of partial correlation and stepwise multiple regression equations, the study examined the mediation model between perceived stress, learning motivation and positive-deactivating academic emotions using process 2.16 (a plug-in specifically used to test mediation or moderation effect in SPSS). Results: There was a significant negative correlation between students' perceived stress and learning motivation during nursing skills training and positive-deactivating academic emotions. Nervousness, loss of control, and interest in developing reputation had significant predictive effects on positive-deactivating academic emotions. The mediating model was well supported. Conclusion: Learning motivation during nursing skills training lessened the damage of perceived stress on positive-deactivating academic emotions. Improving students' motivation to learn could reduce their perceived stress and build more positive emotions. Positive emotions during learning played an important role in helping nursing students improve skills and enhance their nursing competence.

• Journal of Mechanical Science and Technology
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• 제14권11호
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• pp.1216-1224
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• 2000

The collapse pressure of tubes is determined experimentally by Tschoepe and Maison for various materials with different geometries. The results are compared with those obtained by ASME Codes UG-31 and UG-28. A collage pressure is the pressure required for the incipient yielding stress of the tubes with and without ovality. This collapse pressure is compared with the experimental results by Tschoepe and Maison. The present investigation is towards finding the collapse pressure required to bring the entire wall of tubes into a state of plastic flow for the pipes, with ovality and without ovality. This collapse pressure is compared with the collapse pressure obtained through experiments in the present investigation. The experimental results are compared with the pressure obtained by FEM(finite element methods). The FEM results are then compared with results obtained through an approximate plastic analysis of the strain hardening material, SA312-TP304 stainless steel. The structural integrity evaluation is performed for the heat exchanger used in an actual nuclear power plant by using various methods described in this paper. The results obtained by the various analyses and the FEM are discussed. consequently, the paper is oriented towards an actual design purpose of d heat exchanger in an industrial environment, rather than for the purpose of an academic research project investigation.

• Journal of Chest Surgery
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• 제50권4호
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• pp.295-297
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• 2017

A 27-year-old man was admitted with a penetrating injury at the mid-manubrium. Computed tomographic (CT) angiography showed a f illing def ect in the aortic arch. This was evaluated as a sign of injury and the patient underwent an emergency operation. No active bleeding or clot was f ound in the mediastinum during the operation. The laceration point was between the innominate and the left carotid artery posteriorly. The injury was approached using hypothermic circulatory arrest. Aortotomy and exploration showed a 2-cm-long full-thickness aortic injury with an overlying clot. A filling defect on angiography as a sign of a penetrating arch injury has never been reported previously, but was the main pathological finding on CT angiography in our case. The aorta is a high-pressure system and injuries to it should be treated aggressively.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2020년도 추계국제학술대회
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• pp.15-15
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• 2020

In an internal document, CORONA-VIRUS DISEASE 2019 (COVID-19) PLAN, release developed stated that "on January 22, 2020, Palau Ministry of Health activated its emergency operations center, and since then has prepared and put in place measures in response to this global pandemic." The actions eventually led to the closure of most flights coming into Palau as a method to protect its population. The population of is at high risk with COVID19 due to the very elevated rate of NCD's, as well as the limited access to proper testing and treatment facilities. Increased use of traditional medicines in the population has reduced the co-morbidities by reducing risk factors. Furthermore, the expansion of tradtional NCD therapies, especially that of DAK reduce pressure due to obesity and diabetes therefore allowing for unimpaired immune systems to combat deadly infectious diseases such as COVID19.

• 한국콘텐츠학회논문지
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• 제16권9호
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• pp.590-599
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• 2016

본 연구는 청소년의 일상 스트레스와 스마트폰 이용 및 중독이 학업에 어떤 영향을 미치는지 파악하고, 스마트폰 이용에 대한 부모의 중재 효과를 분석하는 데 그 목적이 있다. 이를 위해 청소년(13~18세)을 대상으로 스마트폰 이용 전반에 관한 온라인 설문조사를 실시하였다. 분석 결과, 오락적 목적의 스마트폰 이용 및 스마트폰 중독 경향성이 청소년의 학업 장애 요인으로 나타났다. 또한 가족 간 갈등, 학업, 미래에 대한 압박감 차원의 스트레스가 스마트폰 이용에 따른 학업장애를 이끈다는 것 역시 확인할 수 있었다. 부모의 중재는 그 유형에 따라 스마트폰 이용 및 중독, 학업장애 요인에 대해 서로 다른 효과를 갖는 것으로 나타난다. 이용시간을 제한할수록 오락적 이용이 증가하고, 이용하는 앱을 제한할수록 정보적 이용이 감소하는 것으로 나타났다. 참여적 형태의 부모 중재는 커뮤니케이션을 위한 스마트폰 이용이 증가하며, 앱을 추천하는 방식의 부모 중재는 스마트폰 중독지수를 감소시키는 것을 알 수 있었다.

• Safety and Health at Work
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• 제5권3호
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• pp.165-167
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• 2014

The Dutch construction industry has introduced a compulsory preemployment medical examination (PE-ME). Best-evidence contents related to specific job demands are, however, lacking and need to be gathered. After the identification of job demands and health problems in the construction industry (systematic literature search and expert meeting), specific job demands and related requirements were defined and instruments proposed. Finally, a work ability assessment was linked to the instruments' outcomes, resulting in the modular character of the developed PE-ME. Twenty-two specific job demands for all Dutch construction jobs were identified, including kneeling/squatting, working under time pressure, and exposure to hazardous substances. The next step was proposing self-report questions, screening questionnaires, clinical tests, and/or performance-based tests, leading to a work ability judgment. "Lifting/carrying" is described as an example. The new modular PE-ME enables a job-specific assessment of work ability to be made for more than 100 jobs in the Dutch construction industry.