Signal constellations in the hyperbolic plane: A proposal for new communication systems

Signal constellations in the hyperbolic plane are provided as an alternative to traditional signal constellations in the Euclidean plane, since channels may actually exist for which the latter signal constellations are not as suitable as the former. A hyperbolic gaussian probability density function, based solely on geometrical considerations, is derived to determine the performance of the hyperbolic signal constellations. Benefits result from an approach conceived in terms of reduced signal-to-noise ratio, needed to achieve a prescribed error rate and equivalent optimum receiver complexity.     

Legends in Science: from Boom to Bust

In biology and medicine, a scientist’s legend is most commonly determined by their sphere of influence, either on surrounding peers, on clients in the case of medical practitioners, or on the wider scientific public in the case of research scientists. A scientific paper still constitutes the most effective portal through which ideas, knowledge and opinions can be shared among academics and scholars. Thus, legends in science are built upon a scientist’s published literature. Legend was always assumed to be safe in its final form, i.e., a published paper. Yet, a powerful movement of post-publication peer review has begun to identify that not all has been well with the vetting process that led to the publication of a tranche of the scientific literature, and that editorial oversight and weakness has prevailed in a number of cases, leading to retractions and a more critical re-assessment of the literature. One could say that the half-life of a scientific paper has only just begun once it is published. Within this context of science publishing that has given a sense of false security, legends may evolve from boom to bust within the space of weeks or even months. The legendary status of a scientist is therefore no longer safe if there are hidden or undiscovered errors, fraud or misconduct.     

Perspectives of specific language disability

Annals of Dyslexia -     

电子商务实验课程的设计

对电子商务实验的开设问题提出以课程需要、应用需要以及以基本技能训练和学生创造性能力培养两方面切入实验内容的安排 ,并提供了一个实验安排的样本     

Workplace conditions for successful teacher professional development: School principals’ beliefs and practices

Research has increasingly shown that school principals exercised a significant role in teacher professional development (TPD). Nevertheless, the insights into the particular influence they exert in this process and how it is exercised still need to be developed. This article focuses on what school principals consider important working conditions for TDP and which leadership practices they use to realise these conditions in their schools. Using a multiple case study design, including 20 semi‐strcutured interviews with primary school principals, the findings show that they consider both structural (sufficient time and evaluation of TDP interventions) and cultural (an open work climate and collaboration) conditions to be important for TDP. Additionally, school principals emphasise the significance of teachers’ learning attitudes, differentiation in professionnalisation efforts and knowledge sharing in their schools. Furthermore, the results highlight that they have trouble in realising these working conditions, especially those for internal learning activities (such as an open work climate). Based on the results, recommendations are made for further research and policy makers concerning the preparation and support that principals need to realise (internal) TDP in their schools.     

关于反腐败斗争的几点思考

腐败的表现是多方面的。主要表现在经济活动、组织人事、执纪执法、生活作风、结交朋友、亲属管理等方面。产生腐败的原因是复杂的 ,主要有攀比心理、侥幸心理、从众心理、拜金心理。我们应采取加强教育、依靠法制、搞好监督等措施 ,将反腐败斗争进行到底。