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PSS-PZT계 세라믹스의 탄성표면파 속도특성에 관한 연구
강진규,백동수,김준한,홍재일,박창엽 한국전기전자재료학회 1993 電氣電子材料學會誌 Vol.6 No.2
본 논문에서는 0.05Pb(Sn$_{1}$2/Sb$_{1}$2/)-0.35PbTiO$_{3}$-0.60PbZrO $_{3}$+0.4[wt%] MnO$_{2}$ 조성을 갖는 3성분계 압전세라믹스에 Cr$_{2}$O$_{3}$ 의 첨가량을 변화시켜서 지연선을 제작하고 탄성표면파를 여기시켜 전파속도를 측정하였으며 EMMAS 기준에 따라 각 시편의 재료정수를 측정하고 이를 압전방정식에 적용하여 매질에 따라 여기되는 탄성표면파의 계산속도를 이론적으로 산출한 후 이를 지연선에서 측정된 실험속도와 비교하여 재료의 특성이 탄성표면파의 전파특성에 미치는 영향을 조사하였다. 그 결과 SAW 지연선에서 측정된 탄성표면파는 Generalized Rayleigh Wave였으며 재료의 특성이 우수한 시편일 수록 계산속도와 측정속도와의 차가 적었던 것으로 나타났고 오차한도는 평균 99.39[%]였으므로 실험속도 측정방법이 feed through 현상없이 우수한 측정방법이었음을 알 수 있었다.
강진규,유지원 조선대학교 치의학연구원 2018 Oral Biology Research (Oral Biol Res) Vol.42 No.4
Toothache is one of the most common discomforts experienced by patients in dental clinic. If clinical and radiographic examinationsdo not reveal any pathologic findings, we can suspect nonodontogenic toothache. Nonodontogenic toothache can be caused by avariety of causes such as muscle disorders, sinus and nasal mucosal problems, neuropathic pain, neurovascular pain, psychogenicproblems, and cardiogenic disease. A thorough history and clinical examination should be performed to confirm the cause of the pain,and more accurate diagnosis can be established through local anesthetic injection. If the nonodontogenic toothache is misdiagnosed,unnecessary dental treatment such as root canal treatment, periodontal treatment, and extraction can be performed, and the patient'spain is not alleviated through such treatment. Therefore, the cause of toothache must be diagnosed correctly before dental treatment isperformed, and clinicians should be fully aware of the diseases that may cause these symptoms.
폐쇄성 수면무호흡증 환자에서 구강내 장치의 장기간 사용시 부작용
강진규 대한수면연구학회 2009 Journal of sleep medicine Vol.6 No.2
Obstructive sleep apnea (OSA) is a common sleep disorder which affects personal as well as social life, and increases the incidence of cardiovascular disease. Various treatments are available, including modification of life style, surgical treatment, continuous positive airway pressure (CPAP) therapy and oral appliance therapy. Dentist’s role in treating OSA through oral appliance is to select appropriate type of the appliance with the consideration of the efficacy and possible side effects of the appliance. Oral appliance is known to be effective in mild to moderate OSA, and is relatively more tolerable for the patients compared to other treatment modalities of OSA. However, long term use of the appliance can give rise to various side effects, such as, occlusal change, increase salivation during sleep, xerostomia, temporomandibular disorder, etc. Therefore, oral appliance should be managed by well-experienced dentist who can predict and control the possible side effects.