排序方式： 共有12条查询结果，搜索用时 15 毫秒
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Colak T Akca T Turkmenoglu O Canbaz H Ustunsoy B Kanik A Aydin S 《Journal of Zhejiang University. Science. B》2008,9(4):319-323
Objective: This prospective randomized clinical trial was conducted to evaluate the necessity of drainage after total thyroidectomy or lobectomy for benign thyroidal disorders. Methods: A total of 116 patients who underwent total thyroidectomy or lobectomy for benign thyroidal disorders were randomly allocated to be drained or not. Operative and postoperative outcomes including operating time, postoperative pain assessed by visual analogue scale (VAS), total amount of intramuscular analgesic administration, hospital stay, complications, necessity for re-operation and satisfaction of patients were all assessed. Results: The mean operating time was similar between two groups (the drained and non-drained groups). The mean VAS score was found to be significantly low in the non-drained group patients in postoperative day (POD) 0 and POD 1. The mean amount of intramuscular analgesic requirement was significantly less in the non-drained group. One case of hematoma, two cases of seroma and three cases of transient hypoparathyroidism occurred in the non-drained group, whereas one case of hematoma, two cases of seroma, two cases of wound infections and two cases of transient hypoparathyroidism occurred in the drained group. No patient needed re-operation for any complication. The mean hospital stay was significantly shorter and the satisfaction of patients was superior in the non-drained group. Conclusion: These findings suggest that postoperative complications cannot be prevented by using drains after total thyroidectomy or lobectomy for benign thyroid disorders. Furthermore, the use of drains may increase postoperative pain and the analgesic requirement, and prolong the hospital stay. In the light of these findings, the routine use of drains might not be necessary after thyroid surgery for benign disorders. 相似文献
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NaYeon Yang Huk Yaung Hyunkyung Noh Sun Hee Jang Bora Lee 《International Journal for Educational and Vocational Guidance》2017,17(1):19-38
The current study examined how planned happenstance skills (i.e., curiosity, flexibility, persistence, optimism, and risk-taking) changed during school-to-work transition and how career-related variables were associated with the initial levels and change rates of planned happenstance skills. In a sample of 307 South Korean college students, all planned happenstance skills except for risk-taking decreased over time. Furthermore, some of the career-related variables were associated with the initial level and the change rates of planned happenstance skills. In sum, the current study suggests that utilizing planned happenstance skills may be a worthwhile pursuit during school-to-work transition. 相似文献
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While aquatic exercises have been considered one of the most appropriate learning activities for older adult learners because they are safe and beneficial for health, limited evidence exists regarding how older adult learners perceive their learning environment and different learning strategies. Thus, our research explored older adults’ perceptions of peer-led aquatics classes. We interviewed 19 individuals who participated in aquatics exercise courses in a community recreation center in order to answer the following research questions: (a) How do older adults perceive a peer-led aquatics class? (b) How do older adult learners describe their interaction with their instructor and other learners in their learning environment? Using constant comparative analysis, we identified the participants’ perceptions of peer-led learning with regard to their perceived relationships in class, optimistic views on the peer-led learning concept, mixed and neutral attitudes, and professionalism of teaching. From our findings, we discussed empathic relationships, mixed perspectives derived from learners’ physical condition and personal value, and a lack of peer instructor training programs, especially in a senior fitness field. Findings have implications for senior fitness instructors and educators of older adults. 相似文献
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Saradi Bora 《Resonance》2017,22(2):123-133
The Earth’s ionosphere consists of plasma produced by the photoionization of thin upper atmospheric gases by UV rays and photons of short wavelength from the sun. The upper ionosphere is used for radio communication and navigation as it re-ects long, medium, as well as short radio waves. Since solar radiation is the main cause of the existence of ionosphere, any variation in the radiations can affect the entire radio communication system. This article attempts to brie-y introduce the readers to the study of ionosphere in the context of its use as a radio re-ector, with particular reference to India. 相似文献
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Canan A. Agirtan Taner Akar Seher Akbas Recep Akdur Cahide Aydin Gulsen Aytar Suat Ayyıldız Sevgi Baskan Tugba Belgemen Ozdecan Bezirci Ufuk Beyazova Fatma Yucel Beyaztas Bora Buken Erhan Buken Aysu D. Camurdan Demet Can Sevgi Canbaz Gurol Cantürk Meltem Ceyhan Abdulhakim Coskun Kadriye Yurdakok 《Child abuse & neglect》2009,33(4):247-255
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Unified modeling and analysis of a proportional valve 总被引：4，自引：0，他引：4
Developments in nonlinear control theory have made it possible to design controllers for systems having non-smooth nonlinearities in their dynamics. Hydraulic systems that use inexpensive proportional valves are examples of such systems, where nonlinearities arise due to valve geometry and spool imperfections. Without a proper valve model, however, nonlinear analysis and control of these hydraulic systems is not possible.We have developed nonlinear equations for a generic proportional valve model and have used them to obtain simplified flow rate expressions under generally accepted assumptions. These equations relate a set of geometric spool properties and physical model parameters to the flow rate through the valve ports. The development focuses on obtaining a single set of flow rate equations applicable to critical center, overlapped, and underlapped proportional valves. These unified model equations are useful for simulation and nonlinear controller design. We have also demonstrated that the errors incurred when using the unified valve model are dependent on the damping coefficient alone and are less than 10% in the frequency range within which most valves are used. 相似文献
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Bora Lee Monique Landberg Ki-Hak Lee 《International Journal for Educational and Vocational Guidance》2016,16(1):45-68
This study examined how the endorsement of work values changed over time and investigated the role of socioeconomic status in the development of work values. A 5-year longitudinal sample of Korean adolescents was used. Three work values were measured: Extrinsic reward, working conditions, and personal development. Findings indicate that Korean adolescents’ endorsement of extrinsic reward and working conditions declines modestly over time, while no systematic change was found in the personal development value. Adolescents from a lower socioeconomic status were generally less likely to endorse work values than those from higher socioeconomic status. Implications regarding career interventions are discussed. 相似文献