• Transactions of the Korean Society of Automotive Engineers
• /
• v.17 no.4
• /
• pp.101-107
• /
• 2009

Actuators using shape memory alloys use the one-way shape recovery stress. But when external load is applied the accumulated plastic strain induced by repeated deformation is the factor of generation of uncorrect recovery stress and unreliability. To solve this problem, two-way shape memory effect (TWSME) is considered. TWSME induced by plastic deformation have advantages including simple heating cycle without external force and enough recovery force for using actuators. but there is no research on cylinder-type or tube-type shape memory alloy actuators using two-way shape memory effect until now. Therefore in this study, characteristics of two-way shape memory effect is verified through the compression experiments using cylinder-type and tube-type specimens.

• Journal of the Korean Chemical Society
• /
• v.7 no.4
• /
• pp.264-270
• /
• 1963

The general equation for the substituent effect test, which was derived in the previous paper, has been extended to correlate thermodynamic parameters of solvolysis reaction by modifying the potential energy term to represent the effect of changes in solvent composition. The linear fits of the new equation, $\Delta{\Delta}H^\neq=a'Y+b\Delta{\Delta}S^\neq$, were tested with 35 examples from literature and average correlation coefficient of 0.977 was obtained. Examination of results showed that the equation is generally applicable to solvolysis reaction and helps elucidate some the difficulties experienced with the Grunwald-Winsteln equation. It has been stressed that the linear enthalpy-entropy effect exists only between the external enthalpy and entropy of activation, and therefore strictly it is the linear external enthalpy-entropy effect.

• Korea Journal of Hospital Management
• /
• v.15 no.2
• /
• pp.1-14
• /
• 2010

This study tried to analyze about the investment effects on the spent capital and possessed tangible assets of some hospitals during their hospital management. For this analysis purpose, this study used the financial data of 100 hospitals which presented their financial statements to an finance-information company from 2004 to 2006. The analysis was done with PEFR(Percentage of External Funds Required) and Tangible Asset. The FEPR considered the retained interior fund relating to the investment types in the hospital industry. And the Tangible Asset was related to the possession condition of facilities and equipment. The EBIT rate(Earnings before interest and tax to sales) meaning the management performance and tangible asset turnover were used as the measured variables of investment effect. As the result of data analysis, it was identified that the tangible asset like the hospitals's facilities and equipment was not an agent significantly to influence on the management performance(EBIT rate), the eventual goal of hospital management. But, it was identified that there was some differences tangible asset turnover according to each hospital's main characteristics. And at targeting the all sample hospitals, it was found that the management performance(EBIT rate) had some significant effect on the retained earnings rate, a part of source of PEFR.

• Computers and Concrete
• /
• v.11 no.4
• /
• pp.305-316
• /
• 2013

This paper aims to study the effect of measurement methods and cracking on chloride transport of concrete materials. Three kinds of measurement methods were carried out, including immersion test, rapid migration test and steady-state migration test. All of these measurements of chloride transport show that chloride ion diffusion coefficient decreased with the reduction of water to cement ratio. Results of the immersion test were less than that of rapid migration test and steady-state migration test. For the specimen of lower water to cement ratio, the external electrical field has little effect on chloride binding relatively. Compared with the results obtained by these different measurement methods, the lower water to cement ratio may cause smaller differences among these different methods. The external voltage can reduce chloride binding of concrete, and the higher electrical field made a strong impact on the chloride binding. Considering the effect of high voltage on the specimen, results indicate that results based on the steady-state migration test should be more reasonable. For cracked concrete, cracking can accelerate the chloride ion diffusion.

• Ocean Systems Engineering
• /
• v.13 no.1
• /
• pp.43-55
• /
• 2023

In this study, the SCFs in tubular T-joints stiffened with external ring under axial load are studied and discussed. After verification of the present numerical model with the results of several available experimental tests, 156 FE models were generated and analyzed to parametrically evaluate the effect of the joint geometry and the ring geometry on the SCFs. Results indicated that the SCF of the stiffened T-joints at crown point can be down to 24% of the SCF of the corresponding un-reinforced joint at the same point. Also, the effect of the ring on the SCF at saddle point is more remarkable than the effect of the ring on the SCF at crown point. Moreover, against un-reinforced joints under axial load, the SCF at saddle point of the stiffened joint is smaller than the SCF at crown point of that stiffened joint. The ring results in the redistribution of stresses in the ring and metal substrate. Also, the effect of the ring thickness on the decrease of the SCFs is slight and can be ignored. In final step, the geometric parameters affecting the SCFs of the stiffened T-joints are analyzed by multiple nonlinear regression analyses. An accurate formula is proposed for determining the SCFs.

• Journal of the Korea Safety Management & Science
• /
• v.26 no.1
• /
• pp.15-24
• /
• 2024

The purpose of this study is to improve the stack effect of the staircase and the failure to take into account the opening of the outside door of the staircase, which are the disadvantages of the existing smoke control only vestibule. As a result of the study, the new vestibule and the staircase simultaneous smoke control are equipped with an exhaust flap damper with an effective opening area of about 0.25 m² in the upper part of the staircase, and a ventilator-type air supply fan of about 5 m³/s in the lower part, and take measures to prevent overpressure in the staircase. If you use the new simultaneous smoke control method of the vestibule and staircase, you can achieve the following effects. First, it is possible to open the external entrance door. Second, it can reduce the stack effect. Third, the staircase door closes automatically without fail. And a new method of preventing overpressure was proposed for the vestibule.

• Physical Therapy Korea
• /
• v.5 no.3
• /
• pp.1-10
• /
• 1998

In motor learning, the relative frequency of external feedback is the proportion of external feedback presentations divided by the total number of practice trials. In earlier studies, increasing the percentage of body weight loading on the affected leg of hemiplegic patients, external feedback was continuously produced as the patient attempted to perform a movement. This feedback was produced to enhance the learning effect. However, recent studies in nondisabled populations have suggested that compared with 100% relative frequency conditions, practice with lower relative frequencies is more effective. My study compared the effect of 100% relative frequency conditions with 67% relative frequency conditions to determine what effect they exerted on motor learning for increasing the percentage of body weight loading on the affected lower limbs of patients with hemiplegia. Twenty-four hemiplegic patients were randomly assigned to one of two experimental groups. Each group practiced weight transfer motor learning on a machine. During practice, visual feedback was offered to all subjects. The experiment was carried out with full visual feedback for patients in group one but only 67% visual feedback for patients in group two. The percentage of loading on the affected leg was recorded four times: before learning (baseline value), immediately after learning, 30 minutes after learning, 24 hours after learning. The results were as follows: 1. In the 100% visual feedback group, the percentage of loading on the affected leg increased significantly in all three testing modes over the baseline value. 2. In the 67% visual feedback group, the percentage of loading on the affected leg increased significantly in all three measurements. 3. Immediately after learning, the learning effect was not significantly different between the two groups, but was significantly greater after both the 30 minutes delay and the 24 hours period. These results suggest that the 33% reduction in the provision of visual feedback may enhance the learning effect of increasing the percentage of body weight loading on the affected leg in patients with hemiplegia.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.12 no.5
• /
• pp.2078-2086
• /
• 2011

The purpose of this study is to study internal and external factors affecting entrepreneurial intention of korean professional soldiers who are supposed to retire less than one year. Another main focus of this study is to find out whether there is mediating effect of entrepreneurial support programs for entrepreneurial intentions. In this research, data were collected from 361 officers and non-commission officers who are scheduled to retire from the military within 5 months to one year after at least 10 years of military service. The collected data were analyzed by SPSS using the regression analysis method. In this study, we found that internal factors did not positively affect entrepreneurial intentions, however, external factors positively affected entrepreneurial intentions. It was also found that entrepreneurial support programs played important role as moderating variables between social perceptions toward entrepreneurs and their entrepreneurial intentions. Based on these findings, implications of research implications are discussed, and recommendations for future research were provided.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.11
• /
• pp.302-313
• /
• 2016

This study conducts statistical analysis based on a survey of 300 CEOs from Korean companies in order to examine the effects of a CEO's internal?external activities (information, knowledge management, learning organization) on business innovation activity (exploitative, exploratory) and business performance. Analysis results show that learning organization activity had a significant positive (+) effect on exploitative and exploratory innovation activity. In addition, knowledge management activity lacked statistically significant effects on exploratory innovation activity. Furthermore, exploitative and exploratory innovation activity was affected by CEO's internal?external activities (information, knowledge management, learning organization) and had a significant positive (+) effect on company's business performance. but it was shown that the level of influence was different. Results of this study imply that maximizing business performance through developing innovation activity by CEO's internal?external activities (information, knowledge management, learning organization) in the company, extracting activity advantageous to company's business environment based on activity perceived in the precedent study and business strategy becomes advantageous to the attainment of business performance objectives.

• Journal of Korean Home Economics Education Association
• /
• v.13 no.2
• /
• pp.25-36
• /
• 2001

The purpose of this study is to activate the disposition behaviour of dealing with the recyclable clothes by using the primary causes related to the behaviour. The summary of the outcome of this research is as follows. First. the attitude of girl students toward the consumption of their clothes is of great value. It presents the attitudes toward both the internal incentive and the external incentive are of great value and the attitude toward the external incentive has a little higher level than the attitude toward the internal incentive does : the altruistic behaviour of high school girls who tend to simply give or donate their clothes to their relatives or neighbors has a higher level than the economic behaviour by barter or sale at second-hand. Second. there's a positive correlation between the attitude toward the consumption of clothes and the altruistic behaviour in dealing with clothes and there is not a significant correlation between the attitude toward the consumption of clothes and the economic behaviour. The attitude toward the internal incentive has a positive correlation with the altruistic disposition. This research shows that there's a positive correlation between the attitude toward the external incentive and the economic disposition behaviour and the altruistic disposition behaviour. Third. the relative power of influence of the related variables that have an effect on the altruistic disposition behaviour shows that the attitude toward the internal incentive comes first and the personal contact with the information comes second. the attitude toward the consumption of clothes comes third and the existence of mother's job comes last in order of influence. The relative power of influence of the related variables that have an effect on the economic disposition behaviour shows that grades and the attitude toward the external incentive comes first and the existence of siblings comes next in order of influence.