Necessary Conditions for K/2 Degrees of Freedom

Stotz et al., 2016, reported a sufficient (injectivity) condition for each user in a K-user single-antenna constant interference channel to achieve 1/2 degree of freedom. The present paper proves that this condition is necessary as well and hence provides an equivalence characterization of interference channel matrices allowing full degrees of freedom

Exploratory Evidence for the Adoption of the Ias 7 in Turkey

This paper examines the adoption of the International Accounting Standard No 7 (IAS 7) “Cash Flow Statements (CFS)” of the International Accounting Standards Board (IASB) by the listed companies in the Istanbul Stock Exchange (ISE) in Turkey. The purpose of this study is to provide brief information about the history and background of the adoption or harmonization of the global financial reporting standards, to explore the degree of homogeneity in choosing among different options permitted by the IAS 7 and the degree of compliance with it. In order to achieve this purpose, an exploratory study was developed and conducted by analyzing financial statements of 17 non-financial firms of ISE top 30 from the year of 2007 to 2009. The findings of the study have shown a significant heterogeneity and non-compliance in applying the IAS 7 in Turkey. The high degree of heterogeneity may dismiss the comparability of financial statements across entities, requiring further efforts by the IASB to reduce options permitted in its standards. The high degree of non-compliance may create the risk of misleading financial information users who might have expected that the audited financial statements they have been prepared according to the IASB standards.accounting harmonization, adoption, compliance, IAS 7, cash flow statement.

Random Access Channel Coding in the Finite Blocklength Regime

Consider a random access communication scenario over a channel whose operation is defined for any number of possible transmitters. Inspired by the model recently introduced by Polyanskiy for the Multiple Access Channel (MAC) with a fixed, known number of transmitters, we assume that the channel is invariant to permutations on its inputs, and that all active transmitters employ identical encoders. Unlike Polyanskiy, we consider a scenario where neither the transmitters nor the receiver know which transmitters are active. We refer to this agnostic communication setup as the Random Access Channel, or RAC. Scheduled feedback of a finite number of bits is used to synchronize the transmitters. The decoder is tasked with determining from the channel output the number of active transmitters ($k$) and their messages but not which transmitter sent which message. The decoding procedure occurs at a time $n_t$ depending on the decoder's estimate $t$ of the number of active transmitters, $k$, thereby achieving a rate that varies with the number of active transmitters. Single-bit feedback at each time $n_i, i \leq t$, enables all transmitters to determine the end of one coding epoch and the start of the next. The central result of this work demonstrates the achievability on a RAC of performance that is first-order optimal for the MAC in operation during each coding epoch. While prior multiple access schemes for a fixed number of transmitters require $2^k - 1$ simultaneous threshold rules, the proposed scheme uses a single threshold rule and achieves the same dispersion.Comment: Presented at ISIT18', submitted to IEEE Transactions on Information Theor

Gaussian Multiple and Random Access in the Finite Blocklength Regime

This paper presents finite-blocklength achievabil- ity bounds for the Gaussian multiple access channel (MAC) and random access channel (RAC) under average-error and maximal-power constraints. Using random codewords uniformly distributed on a sphere and a maximum likelihood decoder, the derived MAC bound on each transmitter’s rate matches the MolavianJazi-Laneman bound (2015) in its first- and second-order terms, improving the remaining terms to ½ log n/n + O(1/n) bits per channel use. The result then extends to a RAC model in which neither the encoders nor the decoder knows which of K possible transmitters are active. In the proposed rateless coding strategy, decoding occurs at a time n t that depends on the decoder’s estimate t of the number of active transmitters k. Single-bit feedback from the decoder to all encoders at each potential decoding time n_i, i ≤ t, informs the encoders when to stop transmitting. For this RAC model, the proposed code achieves the same first-, second-, and third-order performance as the best known result for the Gaussian MAC in operation

The Market Performance of Initial Public Offerings in the Istanbul Stock Exchange

This study examines the long-standing IPO performance in the Istanbul Stock Exchange (ISE) by using new factors such as source of shares (new issue or sale of large shareholders), allocation of shares and dispersion of investors as well as existing factors such as market conditions (hot/cold), underwriters’ reputation, and firm characteristics (firm size, E/P, and B/M ratios) in the period of 1990-2000. Our results differ from the previous studies at least three ways. First, the magnitude of underpricing is significantly lower, while underperformance is higher than those of in other studies. Our strong evidence supports the existence of the underpricing by positive initial excess returns (5.94%) and the long-term underperformance up to three-year holding period (-84.5%) in the ISE. Second, underperformance starts much earlier than in other markets i.e. at the end of first month following the IPO because of myopic behavior of investors seeking short-term returns. Third, the underperformance disappears for IPOs made in a cold market, and those made through the sale of large shareholders. Allocation of shares in an IPO and firm size also impact after-market performance of sharesInitial Public Offerings, Underperformance, Underpricing, Market Efficiency, Emerging Markets

IFRS 2005 in Turkey; Can We See the Evidences on the Financial Reports of the Companies Listed?

The Turkish economy has been emerging one during the last decades. So, has been the Turkish Capital Market. This study focuses on the IFRS applications in 2005 in Turkey. Particularly has dealt with the following research questions: First, what has been the position statement of the goodwill and the deferred taxes on the financial statements investigated? Second, what has been the importance of the amounts of the goodwill and the deferred taxes on financial statements investigated? In order to find out the reasonable answers to the questions above, the financial reports IFRS applied of the top 100 companies listed on the Istanbul Stock Exchange have been analyzed. Data available on the web pages were obtained from financial reports of those. The empirical research was conducted through a statistical software package. The financial statements as of December 31, 2003, 2004, and 2005 have been covered by the study. The results have shown the impacts of the items covered in the study on the financial positions of the companies investigated.IFRS, Emerging Economies, Goodwill, Deferred Taxes

İlk ödülün sevinci:Melih Cevdet Anday'la

Taha Toros Arşivi, Dosya No: 326-Melih Cevdet Andayİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

Neyzen Tevfik

Taha Toros Arşivi, Dosya No: 62-Neyzen Tevfikİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

Muhsin Ertuğrul "Tiyatro Seferberliği" açtı

Taha Toros Arşivi, Dosya No: 99-Muhsin Ertuğrulİstanbul Kalkınma Ajansı (TR10/14/YEN/0033) İstanbul Development Agency (TR10/14/YEN/0033

Cyrtophora citricola (Araneae: Araneidae: Cyrtophorinae), a first record for Turkey

We recorded the tent-web spider Cyrtophora citricola (Forsskål, 1775) (Araneidae: Cyrtophorinae) from Turkey for the first time at two sites. Body measurements and a brief description of the female are presented, as well as information on the sites (olive and orange orchards, shrubs) and the accompanying spider fauna