OPTING IN AND OPTING OUT: CAN THERE BE UNIFORM INTERPRETATION OR DOES VARIATIO DELECTAT GOVERN?

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Cotorsion torsion triples and the representation theory of filtered hierarchical clustering

We give a full classification of representation types of the subcategories of representations of an $m \times n$ rectangular grid with monomorphisms (dually, epimorphisms) in one or both directions, which appear naturally in the context of clustering as two-parameter persistent homology in degree zero. We show that these subcategories are equivalent to the category of all representations of a smaller grid, modulo a finite number of indecomposables. This equivalence is constructed from a certain cotorsion torsion triple, which is obtained from a tilting subcategory generated by said indecomposables.Comment: 39 pages; corrected the lists appearing in Cor. 1.6 and minor changes throughou

Universality of the Bottleneck Distance for Extended Persistence Diagrams

The extended persistence diagram is an invariant of piecewise linear functions, introduced by Cohen-Steiner, Edelsbrunner, and Harer. The bottleneck distance has been introduced by the same authors as an extended pseudometric on the set of extended persistence diagrams, which is stable under perturbations of the function. We address the question whether the bottleneck distance is the largest possible stable distance, providing an affirmative answer.Comment: 20 pages + 12 pages appendix, 18 figures, LaTeX; removal of appendix on "stable functors on M" which has moved to arXiv:2108.09298, added and improved figures, added a note of caution regarding variants of the bottleneck distance, rewrote the proof of lemma 4.6 (formerly lemma 4.4), added appendix B including the connection to the original definition of extended persistence, several minor edit

Control Perception Differences in IS Offshoring Projects: Conceptualization and Empirical Test of Performance Impact

This paper takes a novel approach to IS project control by studying control perceptions of clients and vendors in IS offshoring projects and the implications of their perceptions for project performance. We present the results of a survey-based analysis of 46 client-vendor dyads involved in IS offshoring projects. A major contribution of this study lies in operationalizing and empirically testing attempted control (control perceived by the client) and realized control (control perceived by the vendor). Based on prior research, we employ a relational governance view to test whether control perception differences decrease IS project performance. Building on transaction cost economics, we then develop and test the rival perspective that control perception differences may improve performance. Our data support the view that perception differences can be beneficial for IS offshoring project performance

Creating of patina on the surface of copper and brass

In paper studied the literature on the creation of patina on architectural objects, which made fromcopper and its alloy. In purposes of cleaning and patination invited to use the polymer a gel, the mixture ofpolymethylmethacrylate and polymethacrylic acid, polyethylene glycol containing gold nanoparticles. It wasfound, that using of polymer gel can protect object from environmental hazards, allows us to give a decorativepainting, can control processes at the interface of polymer gel electrolyte-copper (brass). Besides, it can restoreobject complex shape

Why Do You Control? The Concept of Control Purpose and Its Implications for IS Project Control Research

Existing IS project control research primarily draws on agency theory to conceptualize control, relating control closely to aligning behaviors of self-interested controllees with organizational objectives. Recent studies in neighboring disciplines, however, suggest that the agency view of control is too narrow to fully understand control activities. Informed by these studies as well as drawing on stewardship and coordination theory, we introduce the concept of control purpose to the IS literature. We define this concept as the intentions underlying the controller’s control activities, and distinguish between appropriation- and coordination-oriented controls. To evaluate the control purpose concept, we conduct a secondary analysis of 21 IS project control case studies. Results show that, despite their stated agency focus, most studies report on controls addressing both appropriation concerns and coordination requirements. On this basis, we discuss two potential research areas, knowledge management and control dynamics, where the control purpose concept can offer novel insights