Optimal decision threshold for soft decision cooperative spectrum sensing

In order to achieve higher spectrum efficiency in cognitive radio （CR） systems, a closed-form expression of the optimal decision threshold for soft decision cooperative spectrum sensing based on the minimum total error probability criterion is derived. With the analytical expression of the optimal decision threshold, the impact of different sensing parameters on the threshold value is studied. Theoretical analyses show that the optimal threshold achieves an efficient trade-off between the missed detection probability and the false alarm probability. Simulation results illustrate that the average signal-to-noise ratio （SNR） and the soft combination schemes have a great influence on the optimal threshold value, whereas the number of samples has a weak impact on the optimal threshold value. Furthermore, for the maximal ratio combing （MRC） and the modified deflection coefficient （MDC） schemes, the optimal decision threshold value increases and approaches a corresponding individual limit value while the number of CR users increases. But the number of CR users has a weak influence on the optimal decision threshold for the equal gain combining （EGC） scheme.

Acknowledgments to reviewers of World Journal of Gastroenterology

Many reviewers have contributed their expertise and time to the peer review,a critical process to ensure the quality of World Journal of Gastroenterology .The editors and authors of the articles submitted to the journal are grateful to the following reviewers for evaluating the articles（including those published in this issue and those rejected for this issue）during hte last editing time period.

Technical Evaluation of Eye Drops Instillation： A Systematic Review

Objective： Assess the profile of eye drops in patients with eye diseases. Methods： Studies available in the scientific literature were identified without any time limits using the databases Embase-Medline, Scielo, Scopus and Web of Knowledge. The selected studies were compared with the following inclusion criteria： （i） if the study evaluated the eye drop instillation, （ii） if the study involved participation of patients with eye diseases. Results： Twelve studies met the inclusion criteria. Of them, 83.33% evaluated the technique of eye drop instillation in patients with glaucoma, 8.33% in patients with eye diseases and 8.33% in patients with cataract after undergoing surgery to correct. 41.66% of studies have chosen to record a video of patients to analyze the technique of instilling eye drops and 41.66% did not describe the/esearch location. Regarding the type of study, 75% had the design as prospective cross-sectional, 8.33% prospective open label study, 8.33% intervention study and 8.33% study called masked trial. Although studies evaluate the technique of eye drop instillation, only 8.33% describe in the article the reference in the literature used to evaluate patients. 50% of articles acknowledged some sort of bias or limitation. Conclusion： The limitations inherent in these types of studies should guide future research.

Corporate Social Responsibility （CSR）, Good Corporate Governance （GCG）, and Firm Performance

The strategy of the company, such as corporate social responsibility （CSR）, can be adopted to show a good image of the company to the external parties. The company can maximize the shareholders＇ equities, the prosperity of the owners of interests, the reputation of the company, and the long-term viability of the company by undertaking the CSR. The controversy whether the company should be engaged in CSR or not is still going on. According to the shareholder theory, the supporters of CSR （Donaldson ＆ Preston, 1995; Jones, 1995） say that CSR is a mechanism to achieve a better financial condition and to maximize the property of the shareholders （A. Mackey, T. B. Mackey, ＆ Barney, 2007）. This research investigates in three folds, the relationships among corporate governance, CSR, and firm performance, then the relationship between intellectual property and firm performance. This research shows that the independent board of commissioners is related to CSR. CSR and the institutional ownership are also related to firm performance. In addition, intellectual property is strongly related to firm performance. This means that intellectual property owned by public-limited companies in Indonesia increases firm performance.

Research on Data Compression of WSN Based on Compressed Sensing

For Wireless Sensor Networks （WSN） is responsible for sensing, collecting, processing and monitoring of environmental data, but it might be limited in resources. This paper describes in detail the compressed sensing theory, study the wireless sensor network data conventional compression and network coding method. The linear network coding scheme based on sparse random projection theory of compressed sensing. Simulation results show that this system satisfies the requirements of the reconstruction error of packets needed to reduce the number of nodes to the total number of 30%, improves the efficiency of data communications in wireless sensor network, reduce the energy consumption of the system. With other wireless sensor network data compression algorithm, the proposed algorithm has the advantages of simple realization, the compression effect is good, especially suitable for resource limited, and the accuracy requirements are not particularly stringent in wireless sensor networks.

Task Complexity and Second Language Teaching

In the past few years, the notion of task complexity has been receiving substantial attention in the field of second language acquisition. This paper explores task complexity from the cognitive perspective by analyzing two studies with Skehan＇s limited capacity hypothesis and Robinson＇s cognition hypothesis. The two studies, namely You-Jin Kim＇s （2012） and Mirdamadi and Jong （2015）, explore on how linguistic complexity affects language performance. Two hypotheses, Skehan＇s limited capacity hypothesis and Robinson＇s cognition hypothesis, explain the two studies from the cognitive perspective by predicting either that increasing task complexity reduces a pool of attentional capacity during task performance or that increasing complex tasks promotes greater accuracy and complexity of speech and writing. It is suggested that language teaching, syllabus designing in particular, should be based on the basis of task complexity.

How Can SMEs be Successful： A Legal and Economic Analysis of China Commodity Centre - YIWU

Nowadays, the policy of encouraging the development of SMEs, starting a business has become a popular choice for many people. Alongside entrepreneurial talent, the legal environment and system design are also very significant for SMEs＇ surviving. This Article provides the successful experiences of SMEs in YIWU, including raising sufficient capital from private finance, highly autonomous forms of enterprise, as well as thinking highly of intellectual property. This article analyses the current problems of SMEs from both legal and economic perspectives, and gives three proposals： legalising underground lending system and creating private banks, introducing the Limited Liability Company into China, and providing the road for transforming intellectual property rights into easily realisable interests, for the purpose of building a more advantageous developing environment for SMEs.

Stable Rank One and Real Rank Zero for Crossed Products by Finite Group Actions with the Tracial Rokhlin Property

The authors prove that the crossed product of an infinite dimensional simple separable unital C*-algebra with stable rank one by an action of a finite group with the tracial Rokhlin property has again stable rank one. It is also proved that the crossed product of an infinite dimensional simple separable unital C*-algebra with real rank zero by an action of a finite group with the tracial Rokhlin property has again real rank zero.

Exploration behaviour and behavioural flexibility in orb-web spiders： A review

Orb-web spiders and their webs constitute an ideal model system in which to study behavioural flexibility and spatial cognition in invertebrates due to the easily quantifiable nature of the orb web. A large number of studies demonstrate how spiders are able to modify the geometry of their webs in response to a range of different conditions including the ability to adapt their webs to spatial constraints. However, the mechanisms behind this impressive web-building flexibility in these cognitively limited animals remain poorly explored. One possible mechanism though may be spatial learning during the spiders＇ exploration of their immediate surroundings. This review discusses the importance of exploration behaviour, the reliance on simple behavioural rules, and the use of already laid threads as guidelines for web-building in orb-web spiders. The focus is on the spiders＇ ability to detect and adapt their webs to space limitations and other spatial disruptions. I will also review the few published studies on how spatial information is gathered during the exploration phase and discuss the possibility of the use of ＇cognitive map＇-like processes in spiders. Finally, the review provides suggestions for designing experimental studies to shed light on whether spiders gather metric information during the site exploration （cognitive map hypothesis） or rely on more simple binary information in combination with previously laid threads to build their webs （stigmergy hypothesis）.

Anti-monopoly law in the compulsory licensing of intellectual property

As an incentive to innovation, intellectual property （IP） should be protected by law. However, as it is a key factor in market competition, it should also be subject to competition law. In most jurisdictions, restriction of competition related to IP rights is not a black and white question, and such rights are challenged only when the IP owners hold market power and when protection of their fights has a serious and unreasonable effect on competition. In assessing IP-related restriction of competition, we need to analyze several elements： we have to define the relevant markets, identify the parties concerned, determine their market share, assess the anti-competitive effects of the controls, etc.. China＇s existing legislation is not adequate to solve problems arising from IP-related restriction of competition. Nevertheless, the process of China＇s legislation on this issue shows clearly that the misuse of IP rights for the purpose of excluding or significantly restricting competition is not justifiable under competition law.