• Nuclear Engineering and Technology
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• 제53권8호
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• pp.2708-2715
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• 2021

The Multi-Purpose Overload Robot (CMOR) is a key subsystem of China Fusion Engineering Test Reactor (CFETR) remote handling system. Due to the long cantilever and large loads of the CMOR, it has a large rigid-flexible coupling deformation that results in a poor position accuracy of the end-effector. In this study, based on the Levenberg-Marquardt algorithm, the spatial grid, and the linearized variable load principle, a variable parameter compensation model was designed to identify the parameters of the CMOR's kinematics models under different loads and at different poses so as to improve the trajectory tracking accuracy. Finally, through Adams-MATLAB/Simulink, the trajectory tracking accuracy of the CMOR's rigid-flexible coupling model was analyzed, and the end position error exceeded 0.1 m. After the variable parameter compensation model, the average position error of the end-effector became less than 0.02 m, which provides a reference for CMOR error compensation.

• 한국직업건강간호학회지
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• 제22권2호
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• pp.130-139
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• 2013

Purpose: This study was to identify the relationship among clinical nurse's job overload, self-efficacy, emotional exhaust and turnover intention. Methods: The study was conducted through a survey on 537 clinical nurses in five general hospitals. The data were collected by self-reporting questionnaires and analysed by the SPSS/WIN 17.0 program using descriptive statistics, t-test, ANOVA, Pearson correlation coefficient and stepwise multiple regression. Results: The mean score of turnover intention was 3.04. Turnover intention according to age, total career, job objective, and work off showed significant differences. The significant positive correlations between emotional exhaust and turnover intention (r=.531, p<.001), job overload and turnover intention (r=.514, p<.001) were found. The significant factors influencing turnover intention were emotional exhaust (${\beta}$=.488, p<.001), career (${\beta}$=.175, p<.001), job overload (${\beta}$=.119, p= .003), and number of night (${\beta}$=.117, p=.002), which accounted for 40.3% of the variance. Conclusion: Thought this result, nursing managers should analyze the reasons for high turnover intention, focusing on the main factors affecting turnover intention and consider the solutions to decrease the turnover intention.

• 한국융합학회논문지
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• 제8권3호
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• pp.1-13
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• 2017

본 연구의 목적은 테크노 스트레스 유발요인의 인구통계학적 차이를 살펴보기 위해 수행되었다. 그동안 테크노 스트레스에 영향을 미치는 다양한 요인에 대한 실증연구가 수행되었으나, 근본적 영향을 미친다고 알려져 있는 인구통계학적 요인들에서 어떠한 차이가 있는지에 대한 연구는 수행되지 않았다. 따라서 본 연구는 테크노스트레스 유발요인이 그동안 학자들이 주장해온 인구통계학적인 요인 중에서 성별, 연령, 교육수준, 컴퓨터 사용시간, 직위, 컴퓨터 지식 등에서 각각 어떠한 차이를 나타내는지 실증 분석을 분석하였다. 각각의 인구통계학적 요인을 모두 2개의 요인으로 구분한 후 독립표본 t-검정을 수행하여 차이를 검정하였다. 분석에 사용된 테크노 스트레스 유발요인은 업무과부화, 사생활 침해, 기술복잡성, 기술변화속도 등 5가지이다. 분석결과, 성별과 직위는 기술변화속도에서 유의한 차이를 나타냈다. 교육수준에서는 업무과부화가 차이가 존재하는 것으로 나타났다. 연령에서는 업무 과부화, 사생활침해, 기술복잡성, 기술변화속도에서 차이가 존재하는 것으로 나타났다. 컴퓨터에 대한 활용 지식에서는 기술복잡성, 직무불안정성, 기술변화속도에서 차이가 존재하였다. 마지막으로 컴퓨터 사용시간에서는 유의한 차이가 존재하지 않았다.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제27권4호
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• pp.215-223
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• 2024

Purpose: Patients who receive frequent blood transfusions are at an elevated risk of developing hepatic fibrosis due to iron overload in the liver. In this study, we evaluated the effectiveness of transient elastography (TE) (FibroScan^®) for assessing liver fibrosis in patients with pediatric cancer. Methods: We enrolled 106 consecutive cases of acute leukemia in individuals under 21 years of age. The participants were followed for 2 years. Based on their serum ferritin (SF) levels, the patients were divided into two groups: group 1 (SF≥300 ng/mL) and group 2 (SF<300 ng/mL). A liver FibroScan^® was performed, and a p-value of less than 0.05 was considered statistically significant. Results: Among the various parameters in the liver function test (LFT), alkaline phosphatase was significantly higher in a subgroup of patients aged 5-8 years in group 2 compared to those in group 1. The indices of liver fibrosis determined by TE, including the FibroScan score, controlled attenuation parameter score, steatosis percentage, and meta-analysis of histological data in viral hepatitis score, as well as indirect serum markers of liver fibrosis such as the aminotransferase (AST)/alanine aminotransferase (ALT) ratio, Fibrosis 4 score, and AST to platelet ratio index, did not differ significantly between the two groups. The association between the TE results and LFT parameters was only significant for ALT. Conclusion: Transfusion-associated iron overload does not have a significant correlation with severe liver fibrosis. FibroScan^® is not a sensitive tool for detecting early stages of fibrosis in survivors of pediatric leukemia.

• 성인간호학회지
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• 제13권4호
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• pp.560-570
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• 2001

Purpose: The purpose of this study is to identify factors of the causal attribution of cancer and to determine related variables. Method: Subjects were one hundred and thirty three cancer patients. The tool of the perceived causal attribution used was developed by authors and basically founded on Kim's work(1993). The SAS program was used to analyze the data along with descriptive statistics, t-test, ANOVA, Duncan's Multiple range test, and Principal component analysis and varimax rotation. Results: 1) The perceived causal attribution measurement revealed four factors; overload, destiny, stress, and constitution. The total percentage of variance explained by the four factors was 44.3%. 2) The scores of destiny on women, having religion, unemployed, lower level of education, no spouse, groups of uterine cervix and lung cancer, not receiving an operation and receiving radiation were significantly higher than those other groups. 3) The scores of stress on women, having religion, and not having a job were significantly higher than those on men, without religion, and having a job. 4) The scores of constitution on those in their forties, women, not receiving an operation and receiving radiation were significantly higher than for those in their sixties, men, receiving operation and not receiving radiation. There was no significant difference in the factor scores of overload by any variables. Conclusion: Factors of the perceived causal attribution of cancer among Korean cancer patients were overload, destiny, stress, and constitution. The scores of each factor the perceived causal attribution was significantly different by general and disease related characteristics.

• 한국전자통신학회논문지
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• 제19권4호
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• pp.741-752
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• 2024

사회적으로, 정보보안에 대한 필요성이 증가하면서, 조직들은 정보보안을 위한 기술적 투자를 강화하고 있다. 본 연구는 상대적으로 관심이 부족한 내부자의 정보보안 준수 체계 강화를 위한 방안을 제시하였다. 특히, 조직에서 개인의 행동 원인을 설명하는 계획된 행동이론을 반영하여 기술 스트레스와 조직 공정성을 통해 행동이 변화할 수 있음을 밝히고자 하였다. 연구는 정보보안 도입 기업에 근무하는 조직원에 설문 조사를 하였으며, 383건의 표본을 활용하여 가설 검정을 하였다. 검정 결과, 정보보안 기술에 의한 스트레스(과부하와 불확실성)가 조직원의 태도를 감소시키고, 조직 공정성이 주관적 규범을 높였으며, 자기 효능감과 함께 준수 의도에 영향을 주었다. 더불어, 조직 공정성이 과부하 및 불확실성의 태도에 미치는 부정적 영향을 완화하는 것을 확인하였다. 연구 결과는 조직의 부정적 보안 환경을 개선하기 위한 조직 공정성 조건을 제시하여, 조직 내부의 보안 성과 달성을 위한 방안 마련에 도움을 줄 것으로 기대한다.

• 한국컴퓨터정보학회논문지
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• 제22권4호
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• pp.17-24
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• 2017

In this paper, we propose an efficient dynamic workload balancing strategy which improves the performance of high-performance computing system. The key idea of this dynamic workload balancing strategy is to minimize execution time of each job and to maximize the system throughput by effectively using system resource such as CPU, memory. Also, this strategy dynamically allocates job by considering demanded memory size of executing job and workload status of each node. If an overload node occurs due to allocated job, the proposed scheme migrates job, executing in overload nodes, to another free nodes and reduces the waiting time and execution time of job by balancing workload of each node. Through simulation, we show that the proposed dynamic workload balancing strategy based on CPU, memory improves the performance of high-performance computing system compared to previous strategies.

• 한국정밀공학회지
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• 제18권6호
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• pp.59-66
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• 2001

Fatigue strength of the welding structure is governed by the residual stress at the weldment toe and static tensile overloads were known as relieving the residual stresses. In this study, static tensile overloads were applied to the welding structures which caused the relief of residual stresses. The amount of residual stress relief was found as proportional to the change of fatigue limit at the given conditions. Based on the fact of the proportionality between the change of fatigue limit and that of residual stress, simple measurement technique is proposed. Modified stress-life curves base on proposed technique gave good agreement with test results.

• Journal of Welding and Joining
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• 제19권6호
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• pp.652-657
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• 2001

To analyze and predict crack initiation position and propagation directions on the spot welded area are very important for strength design of the automobile body structure. It is necessary to test by method considering random loads with variable amplitude for strength design of vehicle body structure, because driving cars are actually subjected to random loads with variable amplitude in the road. Although this condition, nearly all tests haute been performed under constant load conditions in the laboratory because it is impossible to replay like an actual conditions. In this study, using in-plane bending type specimens, the overload factor affecting on the fatigue strength, crack initiation and propagation directions of spot-welded specimens have been studied.

• 대한전기학회논문지
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• 제39권2호
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• pp.111-118
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• 1990

This paper presents a new algorithm of contingency analysis and countermeasure to alleviate the line overloads for electric power systems. In this algorithm, the inverse matrix of the new Jacobian matrix when a contingency occurs, in fastly calculated using the house-holder's Inverse Matrix Modification Lamma (IMML) with the original factor table. The generation outputs are firstly adjusted to alleviate all line overloads occurred by the contingency without tripping loads. If the generation adjustment is not enough anymore to alleviate line overloads, then the control of bus injection power is recommended to quickly alleviate remaining overloads with minimum amount of load tripping and generation read-justing at the termination busbars of the overload lines. The proposed algorithm has been validated in tests on the 6 busbar test system.