Quillen cohomology of enriched operads

A modern insight due to Quillen, which is further developed by Lurie, asserts that many cohomology theories of interest are particular cases of a single construction, which allows one to define cohomology groups in an abstract setting using only intrinsic properties of the category (or $\infty$-category) at hand. This universal cohomology theory is known as Quillen cohomology. In any setting, Quillen cohomology of a given object is classified by its cotangent complex. The main purpose of this paper is to study Quillen cohomology of enriched operads, when working in the model categorical framework. Our main result provides an explicit formula for computing Quillen cohomology of enriched operads, based on a procedure of taking certain infinitesimal models of their cotangent complexes. There is a natural construction of twisted arrow $\infty$-category of a simplicial operad, which extends the notion of twisted arrow $\infty$-category of an $\infty$-category introduced by Lurie. We assert that the cotangent complex of a simplicial operad can be represented as a spectrum valued functor on its twisted arrow $\infty$-category.Comment: 70 pages, substantial modifications, section 8 has been remove

OWNERSHIP STRUCTURE AND FIRM CASH HOLDINGS: EVIDENCE FROM THE PUBLIC FLOAT IN IPOS

Department of Management EngineeringI examine the effect of insider ownership on the level of cash holding by measuring the percentage of shares issued to the public, namely public float. Using a sample of 4,402 IPOs between 1990 and 2013, I find that public float has significantly negative relation with the level of firm???s cash holdings. Specifically, the reduced insider ownership by large percentage of shares issued to the public seems to motivate insiders to waste more cash, resulting in decrease in the level of cash holding. This relation persists even after controlling for various firm characteristics. High public float (or small insider ownership) also exacerbate agency problem evidenced by public float being positively associated with discretionary accrual proxy for agency problem. The level of cash holding reduced further when we interact public float with discretionary accrual term. Collectively, this finding suggests that large sales in insider ownership in IPO market worsen the agency problem and consequently motivate insider to squander firm???s cash holding.ope

Development and Assessment of User Interface for Security-Critical Systems

In this master's thesis a user interface for a security application was investigated. The thesis work was done at a security company in Sweden. The goal was to find current problems with the user interface and to develop a new prototype with improvements. A user-centered design approach was employed to achieve this. Another goal was to look at how this method works for security-critical systems and how usability affects security. By conducting a usability test, usability errors were found that affected information security. There were also other problems that arose when having to deal with trying to use a user-centered design approach when working for a security company