Print Media (Books)

Victor Strauss' The Printing Industry: An Introduction to its Many Branches, Processes and Products New York: Bowker, 1967— $24.50).

Charles B. Anderson (ed.) Bookselling in America and the World: Some Observations and Recollections (New York: quadrangle, 1975—$9.50).

Richard Armour's The Happy Bookers (New York: McGraw-Hill, 1976—$6.95)     

Using rating matrix compression techniques to speed up collaborative recommendations

Collaborative filtering is a popular recommendation technique. Although researchers have focused on the accuracy of the recommendations, real applications also need efficient algorithms. An index structure can be used to store the rating matrix and compute recommendations very fast. In this paper we study how compression techniques can reduce the size of this index structure and, at the same time, speed up recommendations. We show how coding techniques commonly used in Information Retrieval can be effectively applied to collaborative filtering, reducing the matrix size up to 75 %, and almost doubling the recommendation speed. Additionally, we propose a novel identifier reassignment technique, that achieves high compression rates, reducing by 40 % the size of an already compressed matrix. It is a very simple approach based on assigning the smallest identifiers to the items and users with the highest number of ratings, and it can be efficiently computed using a two pass indexing. The usage of the proposed compression techniques can significantly reduce the storage and time costs of recommender systems, which are two important factors in many real applications.     

A New System for Classifying Children in the Jewish School

Members of the clergy provide a great deal of counseling. How did this come about? How are they prepared for this role? In what capacity is this role played by rabbis? Do rabbis feel their training is adequate for what they are called upon to do? What are the implications of this for both education and professional development of rabbis? This article addresses these questions historically and through presentation of an empirical study of Conservative rabbis who studied at the Jewish Theological Seminary and are currently in the pulpit.     

A Global Investigation of Granger Causality between Information Infrastructure Investment and Service-Sector Growth

Over the past two decades, both developed and developing countries have been investing a significant portion of their resources in the creation of an information infrastructure. However, speculation abounds regarding the efficacy of information infrastructure investments, especially when the opportunity cost for investing in information technology (IT) is measurably high among developing nations. This longitudinal study introduces and explores infrastructure development and service-sector growth as key metrics for IT investment success. It also traces the notional evidence of IT infrastructure development as mediating the causal relationship between information infrastructure investments and service-sector growth. Using data from low-income, middle-income, and high-income countries, the mediating and lagged impact of information infrastructure on service-sector growth reveals that information infrastructure development does play a significant role as a mediator. It points out that information infrastructure investments can be a misleading causal antecedent if countries fail to develop their infrastructure. It also provides evidence of a recursive relationship between infrastructure development and service-sector growth. An exploratory time-series analysis across different country categories suggests that information infrastructures must be properly developed to reconcile the paradox. In addition, exploratory tests reveal a distinct divergence between infrastructure investments and infrastructure development among different country tiers.