基于Stackelberg博弈的生鲜农产品供应链决策研究

针对生鲜农产品流通过程的巨大损耗,引入期权合同工具,基于Stackelberg博弈,研究一个供应商和一个零售商组成的单周期两阶段供应链的决策问题。在零售商既订购产品又订购期权的情况下,给出分散控制系统中零售商的最优产品订购和最优期权订购策略以及供应商的最优定价策略。经数值分析得到:产品损耗率与零售商的最优期权订购量和最优总订购量成正比,与最优产品订购量先成正比、再成反比;期权订购价与零售商的最优期权订购量和最优总订购量成反比,与最优产品订购量成正比。     

中小学体育课堂教学调控的新内涵

体育新课程改革要求教师的课堂调控不仅要注重教学目标的达成,更要注重学生的长远发展,尊重学生的个体体验和个性差异.体育课堂教学调控是师生共同成长的历程,其目的是促进学生的学习和发展.课程改革为中小学体育课堂调控注入了新内涵.结合实例对体育课堂的有效调控,即对教学目标、教学内容和练习方法三个要素的调控进行了论述.     

Voices of donors: Case reports of body donation in Hong Kong

Body donation is important for medical education and academic research. However, it is relatively rare in Hong Kong when compared with many Western countries. Comprehensive research has been performed on the motivation for body donation in Western countries; however, there is still insufficient research on body donation in Hong Kong to provide information on how to increase the body‐donation rate. To understand the factors involved in the decision to donate one's body, the authors interviewed a registered donor and the daughter of another donor in Hong Kong. The authors interpreted the information collected in light of the available published reports, which mostly focus on body donation in Western countries. Despite the consistency of some demographic factors and motivations between the participants in our study and those investigated in the published reports from Western countries, there are differences in education level and socioeconomic status between the donors in our study and those from Western studies. The authors also suggest that Confucianism and Buddhism in Chinese culture may motivate potential body donors in Hong Kong. Other important factors that influence the body‐donation decision may include family members' body donation, registration as organ donors, and good doctor–patient relationships. Although case report studies have their limitations, this study allows us to explore the complexity of events and establish the interconnectivity of factors involved in body donation, which could not be achieved in previous survey‐based studies. © 2012 American Association of Anatomists.     

Dissecting the dissectors: Knowledge,attitude, and practice of body bequests by Nigerian anatomists

Anatomy education in most African countries is limited by an insufficient number of cadavers for students to undertake dissection. This already significant shortage is exacerbated by an increasing number of medical schools and students. Virtual dissections are impractical in alleviating such a shortfall in African anatomy education, and further cadaver supply is challenged by unethical and dubious sources. This study was designed to assess the knowledge, attitudes, and practice of whole body and organ donation by Nigerian anatomists with the aim of finding solutions to the problems associated with the availability of cadavers in Nigerian medical schools. Out of 46 anatomists that participated in the survey, only 23.9% would consider donating their whole bodies and 60.9% their organs. More than 95% of respondents did not believe that body bequests could become the sole source of cadavers for anatomic dissection in Nigeria. Age and gender were not statistically significant in the choice of being a body or organ donor. The unacceptability to one's family members regarding body donation was the major reason for respondents' unwillingness to make a whole body donation. None of the 14 medical schools sampled in this study have yet instituted a body registration and donation program. The anatomists showed a high level of knowledge and awareness of body bequest programs, which were not reflected by their attitudes and practice. The authors recommend proactive measures aimed at improving the perception and attitudes of Nigerian anatomists. Anat Sci Educ. © 2012 American Association of Anatomists.     

Ultrasound and cadaveric prosections as methods for teaching cardiac anatomy: a comparative study

This study compared the efficacy of two cardiac anatomy teaching modalities, ultrasound imaging and cadaveric prosections, for learning cardiac gross anatomy. One hundred and eight first-year medical students participated. Two weeks prior to the teaching intervention, students completed a pretest to assess their prior knowledge and to ensure that groups were equally randomized. Students, divided into pre-existing teaching groups, were assigned to one of two conditions; "cadaver" or "ultrasound." Those in the cadaver group received teaching on the heart using prosections, whereas the ultrasound group received teaching using live ultrasound images of the heart. Immediately after teaching, students sat a post-test. Both teaching modalities increased students' test scores by similar amounts but no significant difference was found between the two conditions, suggesting that both prosections and ultrasound are equally effective methods for teaching gross anatomy of the heart. Our data support the inclusion of either cadaveric teaching or living anatomy using ultrasound within the undergraduate anatomy curriculum, and further work is needed to compare the additive effect of the two modalities.     

The translucent cadaver: An evaluation of the use of full body digital x-ray images and drawings in surface anatomy education

It has been noted by staff at the Faculty of Health Sciences, Stellenbosch University that medical students neglect the study of surface anatomy during dissection. This study reports on the novel use of Lodox® Statscan® images in anatomical education, particularly the teaching of surface anatomy. Full body digital X‐ray images (Lodox Statscan) of each cadaver (n = 40) were provided to second year medical students. During dissection students were asked to visualize landmarks, organs, and structures on the digital X‐ray and their cadaver, as well as palpate these landmarks and structures on themselves, their colleagues, and the cadaver. To stimulate student engagement with surface anatomy, dissection groups were required to draw both the normal and actual position of organs on a laminated image provided. The accuracy of the drawings was subsequently assessed and students were further assessed by means of practical identification tests. In addition, students were asked to complete an anonymous questionnaire. A response rate of 79% was obtained for the student questionnaire. From the questionnaire it was gathered that students found the digital X‐ray images beneficial for viewing most systems' organs, except for the pelvic organs. Although it appears that students still struggle with the study of surface anatomy, most students believed that the digital X‐rays were beneficial to their studies and supported their continued use in the future. Anat Sci Educ. © 2012 American Association of Anatomists.     

地方院校化学类新型人才培养模式探索

在高等教育大众化的背景下,地方院校发挥教育职能,凸显办学特色,提高毕业生就业率尤为重要.周口师范学院化学系以教学为中心、以考研为抓手全面提高教育教学质量,培养化学类新型人才,实现学生可持续发展和高层次就业,连续5年考研录取率占毕业生总数60%以上,一次性就业率95%以上.成功的培养模式为地方院校化学类新型人才的教育和培养提供了很好的借鉴.     

Student injuries in the dissecting room

Cadaver dissection is the first opportunity for many students to practice handling human tissue and is their first exposure to the occupational hazards involved with this task. Few studies examine dissection room injuries to ascertain the dangers associated with dissecting. We performed a retrospective cohort analysis of dissection room injuries from four student cohorts over an eleven‐year period (2001–2011), including second‐year medical students, third‐year medical students, second‐year dental students, and third‐year science students. Injury data included activity causing injury, object responsible, and injury site. A total of 163 injuries during 70,039 hours of dissection were recorded, with 66 in third‐year medical students, 42 in second‐year medical students, 36 in third‐year science students, and 16 in second‐year dental students. The overall rate was 2.87 injuries per 1,000 dissection hours, with second‐year medical students most frequently injured (5.5 injuries per 1,000 hours); third‐year medical students were least frequently injured (1.3 injuries per 1,000 hours). A significant difference in injury rates between student groups indicated a higher than expected injury rate to second‐year medical students and lower than expected rates to third‐year medical students. Injury rates increased for most groups between 2001–2006 and 2007–2011 periods. Most injuries (79%) were from scalpel cuts to the finger or thumb. This study provides injury rates for dissection room injuries to students, indicating differences in injury frequency between cohorts and an increase in injury rate over time. As scalpel cuts were the most likely injury mechanism, targeting scalpel handling with preventative strategies may reduce future injury risk. Anat Sci Educ 6: 404–409. © 2013 American Association of Anatomists.     

Talking about death: Implementing peer discussion as a coping mechanism to overcome fears about dissection,death, and dying

Many studies have reported on the perceptions of medical students toward dissection. It is important to understand the feelings and symptoms experienced during dissection so that they can be adequately handled. Prior to dissection, first year students are given lectures on aspects of dissection, death and dying, and death rituals in various cultures. Two separate questionnaires, one given during the first week of dissection and another given one month into the program were then completed anonymously by dissection groups. The questions were designed to be open‐ended, thereby encouraging group discussion amongst students. The questionnaires were used to determine the perception of students to dissection and to discover if these perceptions change during the dissection program. The first questionnaire revealed that students do experience fears and anxiety prior to and at the beginning of dissection; however, most of these fears dissipated by the time of the second questionnaire. One month into dissection students cited talking to peers as their main coping mechanism and fewer students mentioned emotional detachment from their cadaver as a coping mechanism, as was the case in the first questionnaire. Dissection was perceived as a positive experience by our student cohort and most students cited the main advantage of dissection as the ability to visualize organs in three dimensions. The comprehensive answers received from the students indicated that thorough discussion of feelings amongst peers occurred, introducing students to an important coping mechanism at an early stage of their learning. Anat Sci Educ. © 2013 American Association of Anatomists.     

物理课教学中的情境创设与学生创新精神

当今社会教育主题是实施创新教育 ,培养创造型人才 ,我国现行的教育体制以培养创新精神和实践能力为核心的素质教育