Objective: The study objectives were to identify factors affecting extension ladders' angular positioning and evaluate the effectiveness of two anthropometric positioning methods. Background: A leading cause for extension ladder fall incidents is a slide-out event, usually related to suboptimal ladder inclination. An improved ladder positioning method or procedure could reduce the risk of ladde...

Air traffic controllers, both civil and military, will soon have the ability to direct pilots to fly complex landing approaches. The imminent replacement of the Instrument Landing System (ILS) with a landing system based on Global Positioning System (GPS) technology at major airports in the United States will allow pilots to fly landing approaches with curved segments and varying descent rates ...

Signal in space (SIS) errors are a major error source for the Global Positioning System (GPS). They are defined as any errors related to satellite transmission, mainly satellite position and clock errors. A better understanding and characterization of the signal in space errors are essential for GPS integrity, because the SIS errors are a metric to determine satellite outages or failures. The s...

treatment planning poses difficulties in edentulous patients for orthognathic surgery prediction and fixation.treatment of severe class iii malocclusion frequently requires orthognathic surgical procedures. for such patients, orthognathic surgery would be the only option before prosthetic rehabilitation.this clinical report describes step-by-step fabrication of a surgical splint for an edentulo...

as functional integration has increased in hand-held consumer devices features such as global positioning system (gps) receivers have been embedded in increasingly more devices in recent years. for example, the train positioning system based on gps provides an integrated positioning solution which can be used in many rail applications without a cost intensive infrastructure. the network built i...

OBJECTIVE To compare the effects of serial casting with positioning for 1 hour per day for the treatment of elbow flexion contracture in adults with traumatic brain injury. DESIGN Pragmatic randomized controlled trial with concealed allocation and assessor blinding. SETTING Four brain injury rehabilitation units. SUBJECTS Twenty-six adults with elbow flexion contracture after traumatic br...

Acetabular component orientation is influenced not only by the orientation at which the surgeon implants the component but also the orientation of the pelvis at the time of impaction. Hence, the orientation of the pelvis at set-up and its movement during the operation are critically important. Using a validated photogrammetric technique, during 67 hip arthroplasties, we measured how 3 surgeons ...

dispute between contractor and broker over “the type and attribute of the wage” in contract leads to a controversy which many imamiehreligious experts believe that has no result but “bilateral oath-taking”. most important criteria of selecting bilateral oath-taking are: simultaneous positioning of contractor and broker in accuser and denier position, lack of common ground between the two sides ...

Abstract Nowadays, robust position, navigation and timing (PNT) information becomes an necessary foundation of e-navigation and requires the trials and development of a new system to improve marine navigation. Positioning estimation methods and their implementation are being investigated in the literature due to their importance in safety and national security services. In this paper, we propos...

Driven by the development of high-performance piezoelectric materials, actuators become an important tool for positioning objects with high accuracy down to nanometer scale, and have been used for a wide variety of equipment, such as atomic force microscopy and scanning tunneling microscopy. However, positioning at the subatomic scale is still a great challenge. Ultrathin piezoelectric material...