In this work we present the ANOCAST environment being an anonymous communication framework based on wireless technology having reached prototype status. By exploiting the availability of current broadcast communication systems (e. g. digital satellites and Wi-Fi) we achieve recipient anonymity and unobservability. We examine our approach by a simulation approach using a prototype implementation...

This paper develops the idea that obsolescence acts as an incentive device to provide quality for experience goods. The argument is that obsolescence affects the frequency at which consumers repurchase products and may punish producers for a lack of quality. A higher rate of obsolescence enables a firm to convince its consumers that it provides high quality. We identify a trade–off between qual...

This paper studies price competition between experts and discounters in a market for credence goods. While experts can identify a consumer’s problem by exerting costly but unobservable diagnosis effort, discounters just sell treatments without giving any advice. The unobservability of diagnosis effort induces experts to use their tariffs as signaling devices. This makes them vulnerable to compe...

We present the traffic analysis problem and expose the most important protocols, attacks and design issues. Afterwards, we propose directions for further research. As we are mostly interested in efficient and practical Internet based protocols, most of the emphasis is placed on mix based constructions. The presentation is informal in that no complex definitions and proofs are presented, the aim...

Market participants can invest to increase their gains from trade before searching for partners. The entrants' type distribution and efficiency are jointly determined correlated. This paper explores a random search model of ex ante investments efficiency, assuming that the investment amount remains investor's private information. We show payoffs equivalent equilibrium when observable. In unique...

the present study clarifies the difference between orthographic words and their phonological correspondents in persian writing system via computing orthographic depth of persian writing system. in this article, first, the relationship between orthographic forms of the words and their phonological correspondents is formalized by using context free and context sensitive grapheme-phoneme rules. th...

Downfall flows from different outlet hydraulic structures such as culverts and jetsthrowingtothe erodible downstream bed cause scour hole and changes in the downstream bed topography. Therefore,by performing some physical modeling tests on culvert jet flow under different angles, changes in the downstream bed topography under the effect of different parameters such as flow rate, depth of the ta...

sugarcane, which has high water requirements, is grown in khuzestan province (iran). climate and optimizing the use of water is very important to sustainable cultivation of sugarcane. studies of water requirements for sugar cane in khuzestan show that in parts of sugarcane agro-industry, the water applied is more than the actual water requirement of the plant. the present study was conducted to...

This paper studies efficient allocation of resources in an economy in which agents are initially heterogeneous with regard to their wealth levels and whether they have ideas or not. An agent with an idea can start a business that generates random returns. Agents have private information about (1) their initial types, (2) how they allocate their resources, and (3) the realized returns. The unobs...

Interocular transfer of the tilt aftereffect was investigated in normal humans with good stereopsis and in subjects without stereoscopic vision. These latter subjects were divided into two groups: those with and those without a history of strabismus. Strabismic subjects showed grossly reduced interocular transfer of the effect (12% mean transfer). Nonstrabismic subjects had moderate transfer (4...