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김진성(Jin-seong Kim),이재후(Jaehoo Lee),박정열(Jungyul Park),이치범(Chibum Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
This paper proposed a simple and novel self-sintering process of silver nanoparticle (AgNP) ink with commercial photo paper. Generally, AgNPs in the commercially available ink is capsuled for its preservability, so it requires sintering process to removing the capsule for high conductivity. In this work, we used commercial photo papers containing chloride on its surface generally, which induces self-sintering of AgNP. When AgNP ink is printed on the photo paper, chlorine ions is emitted from photo paper, and they are acting as sintering agent for AgNPs. Due to this phenomenon, self-sintering process occurs without any additional treatment after printing. We demonstrated proportional relationship quantitatively between conductivity of printed pattern and chlorine atom ratio in several types of photo paper. The sheet resistances measured from printed pattern are low enough (lower than 0.25 ohm/square) for efficient printed electronics.
현환섭 ( Hwansub Hyun ),박인 ( In Park ),이재후 ( Jaehoo Lee ),신상진 ( Sang-jin Shin ) 대한스포츠의학회 2017 대한스포츠의학회지 Vol.35 No.2
Overhead athletes often suffer from elbow injuries due to repetitive throwing movements. In particular, in the baseball pitching motion, a high shear torque generated in the late corking and early acceleration stage causes tensile loads on the medial elbow and shear force on the posterior of the elbow. These repetitive movements can lead to valgus extension overload syndrome. The valgus extension overload syndrome mainly occurs in overhead athletes, and is characterized by limited elbow flexion and pain at the end of extension. It is necessary to differentiate from the stress fracture or the avulsion fracture of the olecranon which complain of posterior elbow pain through computed tomography. The treatment is primarily rehabilitation that restricts the elbow motion. If refractory or mechanical symptoms persist, arthroscopic surgery may be an effective treatment modality for the removal of the osteophytes. In the surgical field, it is desirable to reconstruct the medial collateral ligament when it is confirmed that the ligament is ruptured. Patients who underwent arthroscopic removal of olecranon osteophytes had immediate active elbow exercises and for 3 months were prohibited from pitching exercises. During this period, they were rehabilitated with the focus on strengthening muscles around the scapula, rotator cuff and shoulder. After 3 months, the pitching exercise is gradually started. Six months after the operation, the elbow strength should be restored to the level at which the game starts. Patients who underwent a combined ulnar collateral ligament reconstruction, half pitching are allowed at 6 months.