A description of QUALCOMM Automatic Satellite Position Reporting (QASPR(R)) for mobile communications

Two satellite position reporting has been introduced into the OmniTRACS mobile satellite communication system. This system significantly improves position reporting reliability and accuracy while simplifying the terminal's hardware. The positioning technique uses the original OmniTRACS TDMA timing signal formats in the forward and return link directions plus an auxiliary, low power forward link signal through a second satellite to derive distance values. The distances are then converted into the mobile terminal's latitude and longitude in real time. A minor augmentation of the spread spectrum profile of the return link allowed the resolution of periodic ambiguities. The system also locates the two satellites in real time with fixed platforms in known locations using identical mobile terminal hardware. Initial accuracies of 1/4 mile have been realized uniformly throughout the USA using a satellite separation of 22 degrees and there are no dead zones, skywaves, or cycle slips as found in terrestrial systems like LORAN-C

Comparison morphisms and the Hochschild cohomology ring of truncated quiver algebras

A main contribution of this paper is the explicit construction of comparison morphisms between the standard bar resolution and Bardzell's minimal resolution for truncated quiver algebras (TQA's). As a direct application we describe explicitely the Yoneda product and derive several results on the structure of the cohomology ring of TQA's. For instance, we show that the product of odd degree cohomology classes is always zero. We prove that TQA's associated with quivers with no cycles or with neither sinks nor sources have trivial cohomology rings. On the other side we exhibit a fundamental example of a TQA with non trivial cohomology ring. Finaly, for truncated polyniomial algebras in one variable, we construct explicit cohomology classes in the bar resolution and give a full description of their cohomology ring.Comment: 32 pages, Final Versio

A field study of the nursing services understood by the non-nurse members of three health councils.

Thesis (M.S.)--Boston Universit

Charismatic Technology

To explain the uncanny holding power that some technologies seem to have, this paper presents a theory of charisma as attached to technology. It uses the One Laptop per Child project as a case study for exploring the features, benefits, and pitfalls of charisma. It then contextualizes OLPC’s charismatic power in the historical arc of other charismatic technologies, highlighting the enduring nature of charisma and the common themes on which the charisma of a century of technological progress rests. In closing, it discusses how scholars and practitioners in human-computer interaction might use the concept of charismatic technology in their own work.

The private sector in fisheries: The case of Ghana

The research for this report consisted of two elements: a study of existing literature and data sets on Ghana fisheries, and a field trip to investigate the fishery first hand. The field work was divided roughly equally between key informants in the production, marketing and processing of artisanal and industrial fisheries. For individual fisherfolk, middle women and processors, a purposive sampling system was necessitated by the brevity of the period of research. Where possible, key informants were sought, such as chief fishmen, "Queen" fish mammies and heads of cooperative trading and processing bodies. The bias inherent in this approach is recognised by the authors. Other potential sources of error/bias are the lack of a seasonal perspective of the fishery, unrepresentative nature of the sample of interviews and the necessity to seek informants in accessible areas of Ghana. A number of key informants in Government institutions and agencies as well as donor agencies and universities were also interviewed in order to gain a wider perspective on the framework within which the fisheries sector operates. Where possible, a semi-structured interview format was used, with informants and groups of respondents encouraged to discuss the key issues broadly whilst allowing the flexibility to follow interesting insights as they appeared

Composing Control Barrier Functions for Complex Safety Specifications

The increasing complexity of control systems necessitates control laws that guarantee safety w.r.t. complex combinations of constraints. In this letter, we propose a framework to describe compositional safety specifications with control barrier functions (CBFs). The specifications are formulated as Boolean compositions of state constraints, and we propose an algorithmic way to create a single continuously differentiable CBF that captures these constraints and enables safety-critical control. We describe the properties of the proposed CBF, and we demonstrate its efficacy by numerical simulations.Comment: Submitted to the IEEE Control System Letters (L-CSS) and the 2024 American Control Conference (ACC). 6 pages, 3 figure

Effect of sound stress on ovulation, estrus, and conception in beef heifers

Thirty of the 50 heifers used in estrous synchronization studies and that received prostaglandin and Syncro-Mate B to synchronize estrus were subjected to sound stress for 48 hours after prostaglandin was injected. Fifty-nine percent of 29 sound-stressed heifers that showed estrus within 5 days conceived when artificially inseminated compared with 72 percent of 18 nonstressed heifers

Report on a visit to Indonesia to conduct a review of the post harvest fisheries sector

A review of post-harvest fisheries in Indonesia was undertaken for the Overseas Development Administration, by a fisheries technologist, a biologist, and an economist, during a five week visit in June and July 1988. The terms of reference were: to review post-harvest fisheries and donors' activities in the sector, and to identify a strategy for future ODA inputs. The marine fishery is the most important in terms of value, followed by tambak aquaculture (mostly shrimps and milkfish), and the inland capture fishery. Most of the harvest is sold in the domestic market as wet fish, dried fish, and pindang (fish cooked in brine). Exports of frozen shrimp, from the tambaks and the marine fishery, are becoming increasingly important. Additionally, there are exports of wet fish on ice to Singapore. The team considered that the greatest problem facing the sector is overfishing of the South Java Sea, resulting in operational fishing grounds being located at an ever increasing distance from the main markets on Java. This poses a challenge to resource management, both pre- and post-harvest. The former requiring resource surveys, and the latter, the identification of low-cost improvements to on-board handling, to ensure the supply of fish to Java's predominantly low income population. A study encompassing these aspects is proposed by the EC in collaboration with France; ODNRI, in consultation with ODA HO, will liase with the French technical agency (ORSTOM) to determine whether complementary inputs from ODNRI would be useful. A second area in which action is proposed is in reducing losses from insect infestation of sun-dried fish. Dried fish is an important protein source for low-income groups in Indonesia, and an area in which ODA could make an effective contribution. The use of household insecticides on drying fish in Indonesia has been widely publicised and the practice banned. The problem persists though, and the team recommends a follow-up programme to an existing project. The existing project has provided training to the staff of provincial quality control laboratories in loss assessment and reduction, including the use of a safe (and approved) insecticide - Minawet. Financial analysis of the use of Minawet and adoption trials will be undertaken during the final stages of the existing project. Subject to satisfactory results from these, a large-scale extension project is proposed, aimed at adoption of Minawet by fish processors. An additional element will be the provision of the necessary training and equipment in pesticide residue analysis, for the National Centre for Quality Control and Fish Processing