This paper describes postural behaviour in static reaching sidewards, and the role of the trunk in particular. It turned out that the trunk (chest, pelvis) is not involved when reaching sidewards up to roughly 40-50&#...
详细信息
This paper describes a method we developed heuristically to validate cognitive models with the aid of variable length MARKOV chains. The focus of the proposed method is the validation of sequences of actions rather th...
详细信息
Recent research on modeling timing jitter has raised a requirement for a predictable, high magnitude, uniform, and wide bandwidth H-feld. In this paper, a novel H-feld generator design methodology is proposed. It cons...
详细信息
This paper details the application of three-dimensional image warping techniques to full body scan data. Borrowed from the toolbox of geometric morphometriesmethods commonly used to quantify the size and shape of anat...
详细信息
A unique measurement device, called StickMan, and a customized vehicle climate control system, were developed to measure thermal comfort under transient and non-uniform conditions inside vehicle. The systems were full...
详细信息
Numerous thermal models have been developed for the human body. Most of them are only for the nude person. Without applying clothing, the human thermal models have very limited uses. In this paper, a comprehensive num...
详细信息
The objective of this pilot study was to investigate how far dimensional constraints (vision requirements, head clearance) influence postures of car drivers. For that purpose the preferred sitting postures of 9 subjec...
详细信息
With rising customer expectations, driver comfort will become more and more important for car manufacturers in distinguishing themselves from others. This is a challenge, since it is difficult to predict comfort, espe...
详细信息
This paper presents FDTD design analysis of a dual-band loop wire antenna for a 900/1800 MHz mobile handset with the consideration of the human hand and head effects. The loop wire antenna with a small gap of a 1 FDTD...
详细信息
This paper presents FDTD design analysis of a dual-band loop wire antenna for a 900/1800 MHz mobile handset with the consideration of the human hand and head effects. The loop wire antenna with a small gap of a 1 FDTD-cell size (2.5-mm) is mounted on a metallic box covered by a plastic coating. The human head is modeled as a multi-layered superquadric ellipsoid. This model can cover the case of a sphere, ellipsoid, square cube, or rectangular cube, which facilitate the modeling of the head-shape and tissue properties. The superquadric ellipsoidal head model (with the ears) comprises 9 different tissues of skin, cartilage, fat, muscle, bone, blood, nerve, brain, and eye-lens. Considering the proximity between the handset held by hand and the ear of a head, a y-oriented loop wire antenna is positioned at a distance of 1.25cm. FDTD computation and experimental measurement of the antenna VSWR (mounted on a metallic box with a plastic coating) in free space and held by a hand close to a head is performed. The radiation characteristics of the loop antenna affected by the head and the SAR distribution are important for antenna design and RF exposure studies.
Quest for a material to suit the service performance is almost as old as human civilization. So far materials engineers have developed a series of alloys, polymers, ceramics, and composites to serve many of the perfor...
详细信息
ISBN:
(纸本)0819446025
Quest for a material to suit the service performance is almost as old as human civilization. So far materials engineers have developed a series of alloys, polymers, ceramics, and composites to serve many of the performance requirements in a modem society. However, challenges appear when one needs to satisfy more than one boundary condition. For example, a component with negative Co-efficient of Thermal Expansion (CTE) using a ductile metal was almost impossible until recently. Synthesis of various technologies such as Direct Metal Deposition (DMD) Homogenization design Method (HDM) and multi material Computer Aided design (CAD) was necessary to achieve this goal. Rapid fabrication of three-dimensional shapes of engineering materials such as H13 tool steel and nickel super alloys are now possible using Direct Materials Deposition (DMD) technique as well as similar techniques such as Light Engineered New Shaping (LENS) or Directed Light Fabrication (DLF). However, DMD has closed loop capability that enables better dimension and thermal cycle control. This enables one to deposit different material at different pixels with a given height directly from a CAD drawing. The. feedback loop also controls the thermal cycle. H 13 tool steel is one of the difficult alloys for deposition due to residual stress accumulation from martensitic transformation. However, it is the material of choice for the die and tool industry. DMD has demonstrated successful fabrication of complicated shapes and dies and tools, even with H13 alloys. This process also offers copper chill blocks and water-cooling channels as the integral part of the tool. On the other hand ZrO2 was co-deposited with nickel super alloys using DMD. Flexibility of the process is enormous and essentially it is an enabling technology to materialize many a design. Using DMD in conjunction with HDM and multi-material CAD, one can produce components with predetermined performance such as negative co-efficient of expansion, by
暂无评论