University of California

About: University of California is a education organization based out in Oakland, California, United States. It is known for research contribution in the topics: Population & Layer (electronics). The organization has 55175 authors who have published 52933 publications receiving 1491169 citations. The organization is also known as: UC & University of California System.

The Global Situation

Abstract: Imagine an internet system, linking up computer users. Or a rush of immigrants across national borders. Or capital investments shuttled to varied offshore locations. These world-making "flows," too, are not just interconnections but also the recarving of channels and the remapping of the possibilities of geography. Imagine the landscape nourished by the creek. Yet even beyond the creek's "flows," there are no stable landscape elements: Trees sprout up, transforming meadows into forests; cattle browse on saplings, spreading meadows past forest edges. Nor are forests and meadows the only way to divide up the landscape. Consider the perspective of the earthworm, looking for rich soils, or the weed, able to flourish in both meadow and forest, though only when each meets certain conditions. To tell the story of this landscape requires an appreciation not only of changing landscape elements but also of the partial, tentative, and shifting ability of the storyteller to identify elements at all. Imagine ethnic groups, corporations, refugees, nongovernmental organizations (NGOs), nation-states, consumers, social movements, media moguls, trade organizations, social scientists, international lawyers, and bankers, all swarming alongside creeks and earthworms to compose the landscape, to define its elements, carve its channels of flow, and establish its units of historical agency. We live in a time of self-consciousness about units and scales: Where shall we draw the boundaries of regions? How are local communities composed? And, most important for this essay, what is this thing we call the globe? If social scientists have had a lot to say about these questions of late, so have other people. Contestants form themselves in shifting alliances, mobilized for reasons of power, passion, discipline, or dis-ease and mounting campaigns for particular configurations of scale. Some of the most excited campaigning in the last 25 years has concerned the globe, that planet-wide space for all humanity and its encompassing habitat. Moreover, in the last ten years, talk about the globe has heated up to the point that many commentators imagine a global era,

A Practical and Provably Secure Coalition-Resistant Group Signature Scheme

Abstract: A group signature scheme allows a group member to sign messages anonymously on behalf of the group However, in the case of a dispute, the identity of a signature's originator can be revealed (only) by a designated entity The interactive counterparts of group signatures are identity escrow schemes or group identification scheme with revocable anonymity This work introduces a new provably secure group signature and a companion identity escrow scheme that are significantly more efficient than the state of the art In its interactive, identity escrow form, our scheme is proven secure and coalition-resistant under the strong RSA and the decisional Diffie-Hellman assumptions The security of the noninteractive variant, ie, the group signature scheme, relies additionally on the Fiat-Shamir heuristic (also known as the random oracle model)

Endovascular electrolytically detachable wire and tip for the formation of thrombus in arteries, veins, aneurysms, vascular malformations and arteriovenous fistulas

Abstract: An artery, vein, aneurysm, vascular malformation or arterial fistula is occluded through endovascular occlusion by the endovascular insertion of a platinum wire and/or tip into the vascular cavity. The vascular cavity is packed with the tip to obstruct blood flow or access of blood in the cavity such that the blood clots in the cavity and an occlusion if formed. The tip may be elongate and flexible so that it packs the cavity by being folded upon itself a multiple number of times, or may pack the cavity by virtue of a filamentary or fuzzy structure of the tip. The tip is then separated from the wire mechanically or by electrolytic separation of the tip from the wire. The wire and the microcatheter are thereafter removed leaving the tip embedded in the thrombus formed within the vascular cavity. Movement of wire in the microcatheter is more easily tracked by providing a radioopaque proximal marker on the microcatheter and a corresponding indicator marker on the wire. Electrothrombosis is facilitate by placing the ground electrode on the distal end of the microcatheter and flowing current between the microcatheter electrode and the tip.

On the Corporate Demand for Insurance

Abstract: Insurance contracts are regularly purchased by corporations. The Insurance Information Institute reports that “business insurance accounted for approximately 54.2 percent of the $79, 032,923,000 in direct property and liability insurance premiums written in the United States in 1978” (1979, p. 9). Yet even though annual premiums exceeded $42.8 billion,1 the importance of these contracts has been largely ignored by the finance profession. For example, the topic of insurance is completely absent from the index of virtually all corporate finance textbooks.