Relationships between shifts of the center of gravity and electromyographic activities (EMGs) were investigated in man during standing. The EMG was mainly obtained from the gastrocnemius and soleus muscles (GS), but other muscles, such as hamstring, tibialis anterior and quadriceps muscles were also included. The shift of gravity center was measured as a change in foot pressure. A forward shift...

Today, researchers exploit hybrid craft more than they used to be. The main reason is that they need to high speed as well as extra portability. For instance, a famous hybrid craft is named Hysucat, was designed through the combination of catamaran and hydrofoil. Catamarans, a type of multihull boats, have always considered by designers because of their simultaneous supply of high speed and sta...

A polytope in R is said to be stable on a facet if and only if the perpendicular to that facet through the center of gravity meets the facet itself. One may consider the stability of a body with respect to an arbitrary "center of gravity on the interior of the body [1,3,6], or one may take the center of gravity to be determined by the shape of the body itself. Most typically, the center of grav...

CARLA SÁ*, RAYMOND J. G. M. FLORAX† and PIET RIETVELD‡ *University of Minho, Portugal, and Tinbergen Institute, Roetersstraat 31, 1018 WB Amsterdam, The Netherlands. Email: [email protected] †Department of Spatial Economics, Free University, De Boelelaan 1105, 1081 HV Amsterdam, The Netherlands, and Regional Economics Applications Laboratory (REAL), University of Illinois, Urbana, IL 61801–3671, ...

General gait design for a walking robot has an assumption that the weight of a leg is negligible compared to that of body. Under the assumption, only the gravity center of the body is taken into consideration in the gait design since the total gravity center of whole robot coincides always with the gravity center of the body only. Roughly speaking, however, motion of a weighty leg has serious i...