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This paper discusses a stiffness sensing system that call IIleasure tollgue stiffness in vivo ． Considerillg that the global stif丘less generally depends upon the thickness of tissue ， we utilize the equiva ！ ent ， Ybung ， s modllllls de丘ned by the applied pressllre divided by the ti8sue strain ． We also introdllce an index of mllscle contraction by usillg EMG signal for judging whether the stiffness increase is caused by a muscle contraction or a disease ． By using an experimental systcm 〔 〕 omposed of a gripper typed stiffness sensing system and an EMG sensor ， we 8how that the equivalent tongue Young ' s modulus under mllscle contraction is f ( )ur tillles larger than that under Ilo contractl rl ・ Key Wbrds ： Tongue Stiffness ， Mllscle Contra． ctioI1 ， Medical Diagnosis

In recent years, hybrid vehicles, which use advanced electronic controls, are increasing. As the Engine Control Unit (ECU) has come to be mounted in the engine compartment, solder cracking resulting from the stress due to the mismatching CTE (Coefficient of Thermal Expansion) between electronic and PCB has become an issue. Low elastic modulus material was developed to solve this issue.Low elastic prepreg has a low elastic modulus and high elongation, and also has high reliability properties in CAF (Conductive Anodic Fliament) and heat resistance. Low elastic modulus material applied to the surfaces of PWBs of standard FR-4 material inhibits solder cracking, absorbing the soldering stress.

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