BACKGROUND GPs are often the first point of contact for patients with prodromal schizophrenia. Early intervention, and therefore early detection, of schizophrenia is pivotal for the further disease course. However, recent studies have revealed that, due to its low prevalence in general practice and its insidious features, prodromal schizophrenia often remains unnoticed. AIM To test whether a ...

NAVSYS Corporation has developed a prototype for a flexible, high-performance Space-based Software GPS Receiver (SSGR) to demonstrate the next generation of tracking and navigation capabilities for space applications. Based on a Software Defined Radio (SDR) approach, the SSGR will provide an integrated precision navigation and attitude determination solution for space applications. In order to ...

INTRODUCTION General practitioners (GPs) have the potential to promote alcohol harm minimisation via discussion of alcohol use with patients, but knowledge of GPs' current practice and attitudes on this matter is limited. Our aim was to assess GPs' current practice and attitudes towards discussing alcohol use with their patients. METHODS This qualitative study involved semi-structured, face-t...

A GPS receiver flying on the High Earth Orbit (HEO) AMSAT-OSCAR 40 (AO-40) spacecraft has been returning GPS observations from high above the altitude of the GPS constellation. AO-40, an amateur radio satellite launched November 16, 2000, is currently in a low inclination, 1000 by 59000 km altitude orbit. This low-cost experiment utilizes a mid 1990’s era, 6-channel, C/A code receiver configure...

This paper describes the design, operation and performance test results of a miniature, low cost integrated GPS/inertial navigation system (INS) designed for use in UAV or UGV guidance systems. The system integrates a miniaturized commercial GPS with a low grade Micro-Electro-Mechanical (MEMS) inertial measurement unit (IMU). The MEMS IMU is a small self-contained package (< 1 cu inch) and incl...

BACKGROUND Earlier reports suggest limited clinical reasoning and substantial uncertainty of GPs in assessing patients suspected of dementia. OBJECTIVE To explore the predictors of GPs to decide on the presence and absence of dementia as well as the predictors of diagnostic confidence of GPs. DESIGN An observational study was set up among 107 patients of 64 GPs. The GPs were instructed to u...

OBJECTIVE The aim of this study was to identify factors influencing the prescribing of psychotropic medication by general practitioners (GPs) to nursing home residents with dementia. SUBJECTS AND METHODS GPs with experience in nursing homes were recruited through professional body newsletter advertising, while 1,000 randomly selected GPs from southeastern Australia were invited to participate...

In 1993, the Space Shuttle Program selected an off-the-shelf Global Positioning System (GPS) receiver to eventually replace the three Tactical Air Navigation units on each space shuttle orbiter. A proven, large production base GPS receiver was believed to be the key to reducing integration, certification, and maintenance costs. More GPS software changes, shuttle flight software changes, and fli...

1.1 GPS – benefits & constraints The Global Positioning System (GPS) is an all-weather, global, satellite-based, roundthe-clock system developed by the U.S. Department of Defense, which since the early 1980s has been available to the civilian community and has truly revolutionized navigation, surveying and geodesy. GPS is based on a constellation of up to 30 satellites orbiting the Earth, broad...

Errors in the Coordinated Universal Time (UTC) offset parameters broadcast by Global Positioning System (GPS) satellites caused many thousands of GPS-controlled clocks to be in error by approximately -13 μs on January 25-26, 2016. The erroneous UTC offset information was broadcast by 15 GPS satellites, or half of the available constellation, during the anomaly. This paper discusses the technica...