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When designing lossless networks, one is faced with the problem of choosing a zero configuration for the reflection coefficient ?(s). Bode showed that if parasitic capacitances are present as well as for power transfer optimization, the best zero configuration is to locate all of them in the left half-plane. Recently, Bode's result was generalized to include parasitic immitances at both ends (source and load) of the quadripole.This work adds a new result to the theory by looking at the overall transfer function poles. It is shown that (a) if the source resistance varies, one should select left half-plane zeros for ?(s); and (b) if the load impedance varies, one should select right half-plane zeros.The pole sensitivity criterion used is the distance between the actual transfer function poles and the poles of the ideal transfer function. 相似文献
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The guiding principle behind university writing centres is to focus on the process of writing rather than the finished product, prioritising higher order concerns related to organisation and argumentation of texts rather than lower order concerns of grammar and punctuation. Using survey-based data, this paper examines students’ concerns regarding written texts in English and analyses whether there is a correlation between students’ and peer-tutors’ perceptions of help received/provided in the writing centre at Nanyang Technological University. The aggregate findings show that there is a significant correlation between their perceptions but a further sub-analysis that pairs individual student and peer-tutor responses reveals that there are discrepancies between their perceptions of the type of help received and provided. These findings not only reveal the type of feedback students prefer, whether global or local, but also whether there is a good fit between student needs and tutoring approach based on students’ nationality and English proficiency. 相似文献
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Myung Koo Kang 《Inter-Asia Cultural Studies》2013,14(3):443-456
Abstract The big irony of the Aceh conflict is that the Acehnese grassroots have never been regarded as its rightful stakeholder. More interestingly, the alienation of the people from the process of conflict resolution coincides with the current process of democratization of the Indonesian state following the collapse of Soeharto's authoritarian regime in mid 1998. This paper argues that the resolving of this conflict by the Indonesian government and GAM (Free Aceh Movement) has appeared as if it were the exclusionary business of the political elite of both sides. At the same time the escalation of military violence continues to victimize the civilians both in terms of human lives and socio-economic deprivation. It is now time to seek more participation of the Acehnese civil society groups in the peaceful resolution of this conflict, as these groups constitute one of the conflict's legitimate stakeholders. Otherwise, the prolongation of the conflict would only serve the vested interests of the Indonesian political and military elite. 相似文献
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This Monte Carlo simulation study investigated the impact of nonnormality on estimating and testing mediated effects with the parallel process latent growth model and 3 popular methods for testing the mediated effect (i.e., Sobel’s test, the asymmetric confidence limits, and the bias-corrected bootstrap). It was found that nonnormality had little effect on the estimates of the mediated effect, standard errors, empirical Type I error, and power rates in most conditions. In terms of empirical Type I error and power rates, the bias-corrected bootstrap performed best. Sobel’s test produced very conservative Type I error rates when the estimated mediated effect and standard error had a relationship, but when the relationship was weak or did not exist, the Type I error was closer to the nominal .05 value. 相似文献
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Objective: Present US parents' perceptions about factors leading to early intercourse and strategies for overcoming them. Methods: Conducted analysis of eight focus groups with 78 male and female African‐American and Hispanic caregivers of fifth‐graders and sixth‐graders (ages 10–12). Results: Participants gave the following primary reasons for early sexual activity: lack of structured activities, adult supervision, and communication; and influence of peers, society, and media. They suggested strategies targeting these reasons, and the need for parents, schools, and the community to work together. Conclusion: Incorporating parents' perspectives would help tailor interventions to the needs of the target population and increase parental support. 相似文献
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Yong Jin Kim Jong Man Lee Chulmo Koo Kichan Nam 《International Journal of Information Management》2013
Recent studies on IT outsourcing have examined the effect of contract specification and relationship strength on IT outsourcing performance in a separate manner. Previous studies, however, ignored the importance of the governance effectiveness that bonds contractual control and relationship strength together to deliver expected outcomes in IT outsourcing exchange. In this paper, we propose a model of IT outsourcing management where governance effectiveness mediates the effect of both contractual control and relationship strength on IT outsourcing performance. We collected data from 143 client companies of IT outsourcing and analyzed it using the PLS method. Our findings show that both contract specification and relationship strength significantly influence governance effectiveness, although contract specification carries the more effect on governance effectiveness than relationship strength does. The governance effectiveness in turn mediates the effect of contract specification and relationship strength on three sub-dimensions of outsourcing performance: cost efficiency, performance improvement, and overall satisfaction. The results and implications are further discussed. 相似文献
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OBJECTIVE: Present US parents' perceptions about factors leading to early intercourse and strategies for overcoming them. METHODS: Conducted analysis of eight focus groups with 78 male and female African-American and Hispanic caregivers of fifth-graders and sixth-graders (ages 10-12). RESULTS: Participants gave the following primary reasons for early sexual activity: lack of structured activities, adult supervision, and communication; and influence of peers, society, and media. They suggested strategies targeting these reasons, and the need for parents, schools, and the community to work together. CONCLUSION: Incorporating parents' perspectives would help tailor interventions to the needs of the target population and increase parental support. 相似文献
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The classical problem of broadband matching was first studied by Bode (1) and developed later by Fano (2); however, Fano's solution, although very elegant, has a practical limitation. The key idea is to replace the load Z2(S) by its Darlington equivalent ending in 1 ohm, but the optimum design is, in general, not very simple. Youla (3) proposed an alternative method where it is relatively easy to find the optimum network even for the more complex impedance load. The paper shows that maximization of the gainbandwidth product, in the presence of load or source variations, depends on the choice of the reflection coefficient zeros, either in the left half-plane or in the right half-plane. 相似文献