Ⅰ. INTRODUCTION
In fourth semester most of our department students attend the subject of mechanical manufacturing practice and we have made a bolt by ourselves. But the process was not a soft job. A bolt and nut is used diversely but it seemed that we don't know much about a importance and manufacture of bolts.
A bolt is a threaded fastener used in industry to make two or more mechanical
the merger of 1967, the two companies (McDonnell Aircraft and Douglas Aircraft) were one company. However they were not completely merged. The lack of horizontal movement of executives among the various business units and geographic regions was a key factor contributing to separate organizational cultures and hampered the situation. Additional business unit silos had emerged and created a fractur
Depend upon the severity of deficiency, age
Early Signs
Reluctance to move, lameness, large painful joint
Progress Signs
Spontaneous fracture, compression fracture, curvature ofthe long bone, poor tooth development
Clinical signs
History (particulary diet history)
Blood work (Note : Ca & P concentrations are not necessarily altered)
Radiographs (often see wide cartilageous e
- the base of osteoporotic fragility
osteoporosis는 bone mass 감소로 인한 skeletal fragility 상태를 말한다. 이러한 상태로 인해 fracture의 risk가 증가한다. 즉 bone이 견딜 수 있는 intrinsic strength보다
더 많은 힘이 들어가면 bone break가 일어난다. 이러한 bone에 영향을 주는 요소는 bone architecture, bone shape, bony material property가