Compact e-cash schemes allow a user to withdraw a wallet containing k coins in a single operation, each of which the user can spend unlinkably. One big open problem for compact e-cash is to allow multiple denominations of coins to be spent efficiently without executing the spend protocol a number of times. In this paper, we give a (partial) solution to this open problem by introducing two addit...

Divisible E-cash systems allow users to withdraw a unique coin of value 2 from a bank, but then to spend it in several times to distinct merchants. In such a system, whereas users want anonymity of their transactions, the bank wants to prevent, or at least detect, double-spending, and trace the defrauders. While this primitive was introduced two decades ago, quite a few (really) anonymous const...

Foreign body ingestion is a common emergency problem in children. Coins are the most common foreign bodies lodged in the esophagus. This is a retrospective study where we reviewed 21 consecutive paediatric cases of coins impacted in the upper esophagus. These children were attended at the BP Koirala Institute of Health Sciences, Dharan, from March 2007 to March 2008. In this study, Mc-Intosh la...

All gold and silver coins legally current in the UK Certain French, Spanish and American gold coins 5-franc pieces of the Latin Union All bronze coins legally current in the UK nil nil 3. Gold Coast and Dependencies ditto nil nil ditto Nickel-bronze 1/10 of a penny, halfpenny and 1-penny pieces nil 4. Southern Nigeria (Western Province) ditto Certain French, spanish and american gold coins nil ...

Esophageal foreign bodies (FBs) in children are a commonly seen complaint that can cause severe morbidity. Different methods are used for their extraction. We reviewed our cases and described direct extraction technique. The specifications of 1116 children with esophageal FBs between 1990 and 2000 were evaluated. All FB cases were considered emergencies and intervention was performed in the ope...

The counterfeit coin problem requires us to find all false coins from a given bunch of coins using a balance scale. We assume that the balance scale gives us only “balanced” or “tilted” information and that we know the number k of false coins in advance. The balance scale can be modeled by a certain type of oracle and its query complexity is a measure for the cost of weighing algorithms (the nu...

The role of contact with nickel-containing coins has been controversial. The aim of our study was to compare the release of nickel from Euro (1 and 2) coins and from Polish coins (2 PLN and 5 PLN) at 4oC and 32oC in an immersion test using artificial sweat according to the EU reference method. Nickel extract was analyzed at 8 time points starting from 1 h up to 168 h. After 7 days of test durat...

This paper describes the implementation of a quantitative cost effectiveness analyzer for Web-supported academic instruction that was developed in Tel Aviv University during a long term study. The paper presents the cost effectiveness analysis of Tel Aviv University campus. Cost and benefit of 3,453 courses were analyzed, exemplifying campus-wide analysis. These courses represent large-scale We...

Goldreich-Krawczyk (Siam J of Comp’96) showed that only languages in BPP have constant-round public-coin black-box zero-knowledge protocols. We extend their lower bound to “fully black-box” privatecoin protocols based on one-way functions. More precisely, we show that only languages in BPP—where Sam is a “collision-finding” oracle in analogy with Simon (Eurocrypt’98) and Haitner et. al (FOCS’07...

khanghah gilvan cemetery is located in khalkhal, in the iranian province of ardebil. this cemetery came into light during a highway construction project in khanghah village. until now, three archeological excavations, under the author’s supervision, have been carried out in this cemetery that has resulted in burials from the middle bronze age up to parthian period.   among the excavated burial...