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박노철 ( Byung Han Ko ),고병한 ( No Cheol Park ),박영필 ( Young Pil Park ),안영규 ( Young Gyu Ahn ) 정보저장시스템학회 2014 정보저장시스템학회논문집 Vol.10 No.2
Vibration and acoustic noise arise from the Multilayer Ceramic Capacitor (MLCC) because of the piezoelectric effect of dielectric substance which consists of BaTiO3. However, the phenomenon is not analyzed clearly because the MLCC shows different behavior compare with ordinary piezoelectric substance like PZT. Thus, MLCC was tested under the several DC bias conditions and heat treatment effect was also tested and analyzed in this paper. From the test, MLCC shows not only piezoelectric effect but also another physical phenomenon like electrostriction. Also, it was verified that DC bias affect to the piezoelectric constant of MLCC.
안와가성종양의 임상양상과 스테로이드 반응성에 대한 분석
성미선,오한진,고병이,윤경철,Mi Sun Sung,Han Jin Oh,Byung Yi Ko,Kyung Chul Yoon 대한안과학회 2013 대한안과학회지 Vol.54 No.2
Purpose: To evaluate the clinical features and treatment outcomes of steroid therapy for orbital inflammatory pseudotumor. Methods: Sixty-four patients diagnosed with orbital inflammatory pseudotumor were reviewed retrospectively. Patients with a follow-up period of less than 6 months were excluded from the study. The pseudotumor was classified into myositic, lacrimal, anterior, diffuse, or apical type according to orbital computed tomography findings. All patients were initially treated with systemic corticosteroids and evaluated for response to the treatment. Treatment outcome was considered a “success” if the patient had complete relief of symptoms with no recurrence, and a “failure” if the patient had no or only partial relief of symptoms or showed relapse. Factors affecting the treatment outcome were analyzed. Results: The most frequent lesion subtype was myositis. Periorbital edema was the most common symptom and was evident in 53.1% of the patients. Thirty-eight patients (59.4%) showed treatment success. Age, sex, bilaterality, and mean follow- up length did not correlate with the treatment outcome. A short interval from symptom onset to treatment time and apical subtype were significantly associated with good steroid response (p < 0.05). Conclusions: In orbital inflammatory pseudotumor, myositis was the most common subtype. A short interval from symptom onset to treatment time and apical subtype were associated with good steroid response.