An algorithm for optimal difference systems of sets

Difference Systems of Sets (DSS) are combinatorial structures that generalize cyclic difference sets and are used in code synchronization. A DSS is optimal if the associated code has minimum redundancy for the given block length n, alphabet size q, and error-correcting capacity ρ. An algorithm for finding optimal DSS is presented together with tables of optimal solutions found by this algorithm. Dedicated to Professor Frank K. Hwang on the occasion of his 65th birthday. Research supported by NSF Grant CCR-0310632.     

From Labour Shortage to Unemployment: Soviet Workers' Attitudes about Possible Changes in Labour Relations

Abstract. After seventy years of centralised economy, the ex-Soviet Union is now experiencing the problem of developing a market economy. The monopoly of the means of production had generated guaranteed employment. an elevated number of vacant positions and scarce territorial and occupational mobility. At the same time, there were low salaries and a series of guaranteed basic services. The translation to a market economy can generate the fear of losing certain guarantees. The author analyses these problems, referring principally to field research conducted among industrial workers.