Scheduling jobs to two machines subject to batch arrival ordering

The problem considered is to assign n jobs to two processors so as to minimize the total flow time, with the constraint that a predetermined partial ordering (induced by batch arrivals) must be preserved within the subset of jobs assigned to each processor. An efficient algorithm of time 0(n⁵) is developed, and computational experience is reported.     

Exploiting self‐canceling demand point aggregation error for some planar rectilinear median location problems

When solving location problems in practice it is quite common to aggregate demand points into centroids. Solving a location problem with aggregated demand data is computationally easier, but the aggregation process introduces error. We develop theory and algorithms for certain types of centroid aggregations for rectilinear 1‐median problems. The objective is to construct an aggregation that minimizes the maximum aggregation error. We focus on row‐column aggregations, and make use of aggregation results for 1‐median problems on the line to do aggregation for 1‐median problems in the plane. The aggregations developed for the 1‐median problem are then used to construct approximate n‐median problems. We test the theory computationally on n‐median problems (n ≥ 1) using both randomly generated, as well as real, data. Every error measure we consider can be well approximated by some power function in the number of aggregate demand points. Each such function exhibits decreasing returns to scale. © 2003 Wiley Periodicals, Inc. Naval Research Logistics 50: 614–637, 2003.     

From the people's army to the Jewish people's army: the IDF's force structure between professionalization and militarization

The article discusses processes of “religionization” within the institutional identity and ethos of the Israel Defense Forces (IDF) and the connection of these processes with the significant structural changes the IDF has undergone in recent decades. The main argument presented is that since the late 1980s, the IDF has been in a culture conflict, torn between soldiers and civilians who advocate turning the IDF into a professional army “military professionalization,” and others who wish to preserve, and even strengthen, the “people's army” model. The present article shows that the meaning of the term “people” in this phrase has shifted to refer strictly to the Jewish people, and that a national-ethnic perception strongly influenced by religious-national ideology has been adopted.     

From the sociology of the (military) profession to the sociology of (security) expertise: the case of European national defence universities

Few would disagree that European militaries have experienced dramatic changes since the end of the Cold War. Much of the discussion on these changes to date has referred to the concept of professionalism. However, this approach became outdated as professions in post-industrialist societies entered a state of crisis as a result of growing competition from a variety of competitors. The present study adapts a new framework from the sociology of knowledge literature – sociology of expertise – into one, sociology of security expertise, which is suitable for study of contemporary armed forces. Its utility is demonstrated through analysis of five European professional military education institutions. The analysis shows that European military organisations are transiting, albeit in various degrees, from one form of social organisation of military knowledge production – associated with the military education model common to traditional military colleges – toward another, which is related to the military education model of national defence universities. Hence it is highly probable that European military organisations lose, either voluntary or unintentionally, their professional character and can no longer be unquestionably assumed to be military professions. Hence, they should be analysed hereafter using the sociology of security expertise framework.     

Rethinking strategic culture: A computational (social science) discursive-institutionalist approach

ABSTRACT

The strategic culture approach has been suffering from a prolonged theoretical stalemate, despite a surge in case studies, which culminated in the Johnston-Gray debate and subsequent schism. The present paper outlines a new approach designed to overcome this deadlock, and consists of three arguments. First, the three previous generations of strategic culture studies have failed to explain how strategic culture influences behaviour. Second, aligning strategic culture theory-building with discursive institutionalism offers a way to overcome this fundamental fallacy. Third, a research programme for strategic culture should draw on computational social science to enable it to present and test middle-range theories.     

Explaining the security paradigm shift: strategic culture,epistemic communities,and Israel’s changing national security policy

The paper’s main argument is that Israel’s security policy, which traditionally focused on defending its territorial integrity against regular Arab armed forces, was, by the 2010s, transformed into one that focuses on facing a variety of state- and non-state-based threats. Neo-realist explanations could neither account for the contested nature of the security debate during this period, nor the inconsistent evolution of the policy. The present study aims to solve this conundrum by introducing an alternative approach known as 4th generation strategic culture research. The paper is comprised of four parts. First, the origins and evolution of strategic culture are reviewed, with emphasis placed on the commonly accepted weaknesses that, to date, have prevented it from being used as a testable theoretical concept, and subsequently as an explanatory factor for security policy changes. The second part presents the “modernist constructivism” approach that bridges the gap between traditional constructivism and hypothesis-driven research design. Next, the paper introduces the emerging fourth generation in strategic culture literature, followed by a conceptual framework designed to resolve the inherent weaknesses of the more traditional approaches. Finally, this conceptual framework is applied to analyse the transformation of Israel’s security policy between 1982 and 2014.