The Impartial Anonymous and Neutral Culture (IANC) model of social choice assumes that the names of the voters as well as the identity of the alternatives are immaterial. This models allows for comparison of structural properties social choice rules (SCRs) for large values of the parameters empirically: whether Condorcet winners exist, whether Borda and Condorcet winners are identical, whether ...

We study the computational complexity of computing a manipulation of a two stage voting rule. An example of a two stage voting rule is Black’s procedure. The first stage of Black’s procedure selects the Condorcet winner if they exist, otherwise the second stage selects the Borda winner. In general, we argue that there is no connection between the computational complexity of manipulating the two...

A society facing a choice problem has also to choose the voting rule itself from a set of different possible voting rules. In such situations, the consequentialism property allows us to induce voters’ preferences on voting rules from preferences over alternatives. A voting rule employed to resolve the society’s choice problem is self-selective if it chooses itself when it is also used in choosi...

In order to characterize the set of desirable social choice functions, researchers have proposed axioms that all social choice functions should satisfy. However, it has been shown that achieving these axioms is impossible. Instead of viewing this impossibility result as a limitation, it can be viewed as an opportunity. In this paper, we develop a means of comparing various social choice functio...

Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) is an algorithm that can be used alternative design in a decision support system (DSS). TOPSIS provides recommendation so users get information their decision, example tourist wants visit destination Malang, then recommendations destinations the form ranking recommendation, with highest rank most recommended recommendati...

We study the problem of coalitional manipulation—where k manipulators try to manipulate an election on m candidates—under general scoring rules, with a focus on the Borda protocol. We do so both in the weighted and unweighted settings. For these problems, recent approaches to approximation tried to minimize k, the number of manipulators needed to make the preferred candidate win (thus assuming ...

Disaster is a general term for events that result in physical, economic, and social losses people occur when insufficient resources exist. Natural disasters, particularly earthquakes, are frequent occurrences worldwide. Although plans made both pre-and post-disaster periods, the painful experience of recent major earthquake on Eastern Anatolian Fault Line Turkey has highlighted inadequacy these...