In 2004, Abe et al. proposed a threshold signerambiguous signature scheme from variety of keys. Their scheme is a generalized case of the ring signature scheme, and it allows the key types to be based the trapdoor one-way permutations (TOWP) or sigma-protocols including Schnorr’s signature scheme. However, the signed message is public for all, which may result in disputes. In this paper, we pre...

Attribute-based encryption (ABE) which allows users to encrypt and decrypt messages based on user attributes is a type of one-to-many encryption. Unlike the conventional one-to-one encryption which has no intention to exclude any partners of the intended receiver from obtaining the plaintext, an ABE system tries to exclude some unintended recipients from obtaining the plaintext whether they are...

In every communicative context, each participant assumes some kind of role and negotiates some type of relationship with their counterparts. In the e-learning domain, the roles (e.g. instructor, learner, marker, administrator, etc.) for participants are well structured and relationships (e.g. one-to-one, one-to-many, hierarchical, etc.) among roles are relatively predictable. This paper propose...

This paper studies the effects of generic entry on post-patent price competition for 18 prescription drugs recently exposed to competition. An independent, validating test of the “generic competition paradox” is conducted using a newly created data set. Each generic entrant is associated with an average 1% increase in the branded price. The one-way error component model accounts for intermolecu...

The different options for the reconstruction of the city of Lisbon in the aftermath of the 1755 earthquake are studied with an agent-based model based on randomwalks. This method gives a comparative quantitative measure of mobility of the circulation spaces within the city. The plans proposed for the city of Lisbon signified a departure from the medieval mobility city model. The intricacy of th...

The relationship between social segregation and workplace segregation had been traditionally studied as a one-way causal relationship mediated by referral hiring. In this paper we introduce an alternative framework which describes the dynamic relationships between social segregation, workplace segregation, individuals’ homophily levels, and referral hiring. An agent-based simulation model was d...

In this paper we analyze relationships between different forms of knowledge that can be discovered in the same data matrix (database): regularities, concept descriptions and conceptual clusters (hierarchies). These relationships, very important for our understanding of knowledge, have not received sufficient attention, neither in the domain of machine learning nor from the perspective of knowle...

In this paper we describe a multiagent simulation model of human behavior in the aftermath of a hypothetical, largescale, human-initiated crisis in the center of Washington D.C. Prior studies of this scenario have focused on modeling the physical effects of the attack, such as thermal and blast effects, prompt radiation, and fallout. Casualty and mortality estimates have been obtained by assumi...

This paper adopts agent-based simulation to study the horizontal competition among homogenous price-setting retailers in a one-to-many supply chain (one supplier and multiple retailers). We model the supplier and retailers as agents, and design their behavioral rules respectively. The results show that although the agents learn individually based on their own experiences, the system shows an as...

Distributed Nearest Neighbor Search (DNNS) locates service nodes that have shortest interactive delay towards requesting hosts. DNNS provides an important service for largescale latency sensitive networked applications, such as VoIP, online network games, or interactive network services on the cloud. Existing work assumes the delay to be symmetric, which does not generalize to applications that...