2,005 research outputs found

    Single or Multiple Pricing in Electricity Pools?

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    We present a 2 bidder multi-unit, common cost auction model with uncertain demand and capacity constraints which ensure that the participants sometimes face a residual market share. The model is motivated by electricity pools. We show that a single-price auction where the bidders can submit only one bid for all units weakly dominates an auction where the bidders can make multiple-price bids in terms of average prices. In the case of uniform price auctions we give an example where the dominance is strict.Electricity Pool, Multi-Unit Auction, Revenue Ranking

    The Apple Tree

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    Consider an individual whose preferences are changing over time. How do we assess her welfare? We argue that this is an empirically relevant question as preferences are constantly changing over time if the agent has a bias towards the present. We present a simple example where preferences are changing over time (the apple tree) and use it to aid our discussion of welfare. We critically assess the approach that focuses on the decision maker (revealed preference) and the one that ignores the decision maker (long-run self) with reference to some recent literature. Finally, we look at some of the problems that arise when we consider a sovereign individual who aggregates her changing preferences.

    Affiliation in Multi-Unit Auctions

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    Assessing the current status of the newly revised plasma television program instruction: the case of Silte zone secondary schools

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    The main objective of this study is to assess the current status of the newly revised plasma television program instruction (PTVPI) in Silte Zone secondary schools. Hence, it tried to examine the extent to which classroom teachers and students perform their roles as stated in plasma guide. In addition to this, it tried to examine the extent to which principals support PTVPI, strengths of the newly revised PTVP and factors affecting it. To accomplish this purpose, the study employed descriptive research design. The study was carried out on 6 secondary schools which were selected through the combination of both available and simple random sampling techniques. Then, a total of 304 individuals participated in the study. Among them, 130 teachers and 6 supervisors were included in the sample through available sampling technique. Additionally, 156 students were included through stratified random sampling while the remaining 12 principals were included through the combination of both purposive and available sampling techniques. Questionnaire, interview and observation checklist were used to collect the necessary data regarding the issue. The analysis of the quantitative data was carried out by using percent, mean, standard deviation, independent sample t-test and one-way ANOVA while qualitative data which were obtained through open ended questions and interview were analyzed using narration. The result of the study revealed that, both classroom teachers and principals are sometimes (moderately) performing their roles while students are usually performing their roles. Moreover, the study found out that, the strengths of the newly revised PTVP are highly supporting both the teachers and students to perform their roles while shortage of new PTVs that take CDs and lack of DVDs in schools are extremely affecting PTVPI among many factors in the study area. From the results of the finding, it is possible to conclude that, status of PTVPI in the study area is moderate. Based on the findings of the study, it is recommended that, government need to provide material support to schools and technical support to both teachers and principals through training in order to improve status of PTVPI in the study area by participating the community as well as non-governmental organizations (NGOs).Jimma Universit

    Effective Capacity of Cognitive Radio Links: Accessing Primary Feedback Erroneously

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    We study the performance of a cognitive system modeled by one secondary and one primary link and operating under statistical quality of service (QoS) delay constraints. We analyze the effective capacity (EC) to quantify the secondary user (SU) performance under delay constraints. The SU intends to maximize the benefit of the feedback messages on the primary link to reduce SU interference for primary user (PU) and makes opportunistic use of the channel to transmit his packets. We assume that SU has erroneous access to feedback information of PU. We propose a three power level scheme and study the tradeoff between degradation in EC of SU and reliability of PU defined as the success rate of the transmitted packets. Our analysis shows that increase in error in feedback access causes more interference to PU and packet success rate decreases correspondingly.Comment: Accepted for publication in International Symposium on Wireless Communication Systems (ISWCS) 201

    A Study of IT Facilities and E-Business System Adoption in Libyan Manufacturing Companies

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    It is generally believed that larger manufacturing organizations respond more swiftly to changes in the global market place because they have better resources at their disposal. These companies are therefore able to remain competitive by formulating the appropriate corporate strategies and making investments which enable them to maintain their strategic position. An opinion based on the activities of such organizations might be misleading in validating a country's manufacturing strategy. This research gives an account to Libyan Manufacturing Companies and their adoption of IT facilities and E-business within the Industry. A sample of hundred questionnaires was sent to Libya, only sixty were returned. The results demonstrate that LMCs do not only require the usability of IT facility to enhance their workforce activities; but also some interests into Managerial, leadership, and technical skills as well

    Practices and Challenges of Supplementary Exam in Selected Colleges of Haramaya University, Ethiopia

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    Supplementary assessment particularly re-exam in the context of Ethiopian universities was introduced with the principle of improving academic achievement of failing students with score near to passing marks. Besides, using more extended type of grading system having plus and minus signs that provide more broader and detailed view about students performance rather than using the traditional five point scale grading (A, B, C, D, and F) is prominent feature of higher institutions. Case study method was utilized to look the trends of re-exam in Haramaya University. The subjects of the study were college deans, instructors, students, registrar data managers and their respective heads. To incorporate instructors and students in to the sample, purposive sampling was used. Available sampling technique was utilized to include registrar data managers and their heads. Questionnaire, semi structured interview and document review sheet were used to collect the necessary data.  The finding of the study showed that, instructors were not sufficiently providing tutorials for their students before allowing them to sit for re-exam. Additionally; belittling, absence of fixed schedule (date and time) for re-exam, low instructors readiness & their bad perception towards re-exam due to the absence of incentives were found to be the major challenges that affect the practices of re-exam. The relationship between study year level and the number of students who scored FX grade (r = -0.92, p < 0.05) was negative and significant. Keywords: FX; Grade; Re-exam; Supplementary assessment
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