• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 봄 학술발표회 논문집
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• pp.161-166
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• 2001

Overconsolidated clays have a different stress history according to the deposit environment. The stress history is classified into (i) rotation angle of stress path, (ii) overconsolidation ratio, and (iii) magnitude of length of recent stress path. Stress-strain behaviour of overconsolidated clays strongly depends on these stress history. In this study a series of drained stress path tests were carried out. Test results indicated that stress-strain behaviour of overconsolidated clay(focused on strain rate) depends on OCR and length of recent stress path, especially rotation angle.

• 한국직업건강간호학회지
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• 제21권2호
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• pp.154-163
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• 2012

Purpose: The purpose of study was to identify the relationships among attitude on job rotation, job stress and organizational commitment of hospital nurses. Methods: The data were collected from the self-reported questionnaire responses of 430 nurses from Sep. 1 to Sep. 30, 2010 at a university hospital in D city and analyzed by descriptive statistics, t-test, ANOVA, Scheff$\acute{e}$ test and Pearson correlation coefficients. Results: Nurses who experienced job rotation showed negative attitude on job rotation (t=-4.84, p<.001), high level of job stress (t=3.81, p<.001) and low level of organizational commitment (t=-1.99, p= .047). There was a significantly negative correlation between nurses' attitude on job rotation and job stress (r=-.13, p<.01). Also, there was a significantly positive correlation between nurses' attitude on job rotation and organizational commitment (r=.32, p<.001). Conclusion: These results suggest that job rotation in nurses needs to be planned based on the individual attitude, opinion, specialty and capability in nurse for reducing their job stress and enhancing organizational commitment of hospital nurses.

• The Journal of Advanced Prosthodontics
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• 제12권4호
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• pp.204-209
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• 2020

PURPOSE. Prevention of xerostomia and stress is important to prolong healthy life expectancy and improve the quality of life. We aimed to investigate the effects of tongue rotation exercise for increasing salivary secretions and stabilizing salivary stress hormone levels. MATERIALS AND METHODS. Twenty four participants without subjective oral dryness were enrolled. The exercises comprised tongue rotation exercise and empty chewing. The salivary stress hormone level was measured using a Salivary Amylase Monitor. Unstimulated whole saliva volume and salivary amylase activity were measured before tongue rotation exercise or empty chewing and subsequently 5, 10, and 15 minutes after these exercises. Differences in the rates of change of unstimulated whole saliva volume and salivary amylase activity were analyzed by repeated measure analysis of variance. RESULTS. Statistically significant differences among the rates of change were not observed after empty chewing for unstimulated whole saliva volume and salivary amylase activity at the four measurement times. However, the rate of change of unstimulated whole saliva volume and salivary amylase activity were statistically significantly different among the four time points: before the tongue rotation exercise and 5, 10, and 15 minutes post-exercise (P<.05 and P<.01, respectively). CONCLUSION. Tongue rotation is effective in increasing saliva secretion, reducing stress, improving oral function, and extending healthy life expectancy.

• 센서학회지
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• 제19권1호
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• pp.62-66
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• 2010

We have proposed and demonstrated a rotation angle sensor based on the stress -optic effect of a fused fiber coupler whose transmission spectrum is altered by the torsional stress. The peak of transmission spectrum was shifted to longer wavelength region with rotation of the coupler. The rotation angle sensor revealed reproducibility and symmetric behavior with respect to the rotation direction. The sensitivity of the sensor was 0.367 [nm/degee].

• 한국산학기술학회논문지
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• 제18권10호
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• pp.373-381
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• 2017

본 연구는 간호사의 심리적 안녕감에 영향을 주는 요인과 경로를 설명하는 이론적 모형을 구축하고, 검증하기 위해 실시되었다. 본 연구의 대상자는 B광역시와 G도에 소재한 200병상 이상의 4개 종합병원 병원에 근무 중인 간호사이며, 자료수집은 2017년 7월 3일부터 8월 25일까지 시행하였다. 간호사의 직무순환 스트레스의 경로계수를 검증한 결과, 직무순환 스트레스는 도전적 스트레스 평가, 방해적 스트레스 평가, 심리적 안녕감에 통계적으로 유의한 영향을 미치며, 방해적 스트레스 평가는 심리적 안녕감에 부의 영향을 미치는 것으로 나타났다. 간호사의 직무순환 스트레스는 도전적 스트레스 평가, 방해적 스트레스 평가, 심리적 안녕감에 직접 효과가 있었으며, 방해적 스트레스 평가는 심리적 안녕감에 직접 효과가 있는 것으로 나타났다. 또한 간호사의 직무순환 스트레스는 방해적 스트레스 평가를 매개로 심리적 안녕감에 간접효과가 있는 것으로 나타났다. 간호사는 직무순환을 경험하며 도전적인 스트레스와 방해적 스트레스를 갖는다는 것을 확인하였고, 특히 방해적인 스트레스는 간호사의 심리적 안녕을 떨어뜨리기 때문에 간호조직의 노력과 관리가 필요하다. 이에 간호조직은 간호사에게 직무 순환이 도전적 스트레스 요인이 될 수 있도록 긍정적인 조직 환경을 조성하고 체계적인 전략을 세워야 할 것이다.

• 임상간호연구
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• 제22권3호
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• pp.352-358
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• 2016

Purpose: This study was a methodological research implemented to establish basic data for controlling the job rotation stress of nurses and effectively managing human resources by reflecting the Nurse Job Rotation Stress Scale (NJRS) developed by Huang and others into the domestic nursing environment and verifying the use of measurement tools. Methods: The study selected nurses working at four hospitals, with over 300 beds, in Seoul, Gyeongi-do, and Busan, as its research subjects and verified the content validity, construct validity, concurrent validity, and internal consistency reliability of the measurement tool. Results: The results ultimately formed eight questions from three sub-factors (3 emotional response questions, 2 daily life questions, and 3 communication questions). In terms of reliability, emotional response issued a Cronbach's of .78, daily life issued a Cronbach's of .75, and communication issued a Cronbach's of .86. Conclusion: This study is expected to be used as basic data for achieving effective human resource management by calculating the stress of clinical nurses resulting from job rotation, but the researcher believes that the measurement tools must be expanded by confirming additional job rotation stress questions which reflect the organizational culture of Korea.

• 대한족부족관절학회지
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• 제15권1호
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• pp.22-26
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• 2011

Purpose: To report the effectiveness of adding distal fibular external rotation stress test on the traditional lateral stress Cotton test in evaluating distal tibiofibular syndesmotic injuries. Materials and Methods: We evaluated syndesmotic injuries with intraoperative stress test during treating ankle fractures from March 2009 to September 2010. External rotation of distal fibula using small elevator was added on traditional stress test in case of suspicious syndesmotic injury. We retrospectively reviewed and compared the results of each test in 44 cases for which we tried both tests. Results: In 9 cases of positive traditional lateral stress tests, positive results were obtained in all cases by additional external rotation tests. In 21 cases of negative traditional stress tests, additional stress tests results were also negative. But there were 10 cases of positive additional tests and 4 of negative additional tests in equivocal results cases by the traditional stress tests. Conclusion: Using additional external rotation stress test in case of equivocal test result by the traditional lateral stress Cotton test for evaluation of syndesmotic injury during operation for ankle fracture can be a supplemental method to clarify syndesmotic injury needs fixation.

• 한국기계가공학회지
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• 제9권4호
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• pp.59-65
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• 2010

This paper presents the study on the contact stress analysis of a pair of mating spur gears during rotation. Contact stress analysis is performed between two spur gear teeth at different contact positions during rotation. An example is presented to investigate the variation of contact stress on a pair of mating gears with contact positions. The variation of contact stress during rotation is compared with the contact stress at lowest point of single tooth contact(LPSTC) and AGMA Equation for contact stress. The results show that contact stress varies along the contact position and gets maximum values in the beginning and end of the contact. In this study, the gear design considering the contact stress on a pair of mating gears is more severe than that of AGMA standard.

• 대한간호학회지
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• 제47권4호
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• pp.551-561
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• 2017

Purpose: This study aimed to present and test a structural model for describing and predicting the factors affecting subjective career satisfaction of nurses experiencing rotation and to develop human resources management strategies for promoting their career satisfaction related to rotation. Methods: In this cross-sectional study, we recruited 233 nurses by convenience sampling who had over 1 year of career experience and who had experienced rotation at least once at G university hospital. Data were collected from August to September in 2016 using self-reported questionnaires. The exogenous variables consisted of rotation perception and rotation stress. Endogenous variables consisted of career growth opportunity, work engagement, and subjective career satisfaction. A hypothetical model was tested by asymptotically distribution-free estimates, and model goodness of fit was examined using absolute fit, incremental fit measures. Results: The final model was approved and had suitable fit. We found that subjective career satisfaction was directly affected by rotation stress (${\beta}=.20$, p=.019) and work engagement (${\beta}=.58$, p<.001), indirectly affected by rotation perception (${\beta}=.43$, p<.001) through career growth opportunity and work engagement. However, there was no total effect of rotation stress on subjective career satisfaction (${\beta}=-.09$, p=.270). Career growth opportunity directly and indirectly affected subjective career satisfaction (${\beta}=.29$, p<.001; ${\beta}=.28$, p<.001). These variables accounted for 65% of subjective career satisfaction. Conclusion: The results of this study suggest that it is necessary to establish systematic and planned criteria for rotation so that nurses can grow and develop through sustained work and become satisfied with their career.

• 한국기계가공학회지
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• 제10권2호
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• pp.90-95
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• 2011

This paper presents the study on the contact stress analysis of a pair of mating helical gears for turbo blower during rotation. Turbo blowers need high speed rotation of impeller in structure and high rate gear ratio. The use of helical gear indicated that noise was an important problem when the application involves high speeds and large power transmission. An example is presented to investigate the variation of contact stress on a pair of mating gears with contact positions. The variation of contact stress during rotation is compared with the contact stress at the lowest point of single tooth contact(LPSTC) and AGMA Equation for contact stress. In this study, the gear design considering the contact stress on a pair of mating gear is more severe than that of AGMA standard.