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습표면 열교환기의 응축수 자유표면 형상 해석을 위한 기초연구
안진수(Cheen Su An),추정호(Jeong Ho Chu),김만회(Man-Hoe Kim) 대한기계학회 2017 大韓機械學會論文集B Vol.41 No.12
습표면 열교환기 표면의 응축수 형상 해석을 위한 기초 연구로 자유표면의 형상을 결정할 수 있는 수치적 알고리즘을 섭동법을 기반으로 개발하였다. 운동학적 경계조건과 동력학적 경계조건을 모두 만족하는 해를 구성하는 섭동 유동함수를 주어진 자유표면의 형상에 대해 구하고, 이를 포텐셜 유동으로 주어지는 2차원 유동에 적용하여 해석해와 비교 검증하였다. 개발된 알고리즘은 비선형 관성항이 포함된 유동의 자유표면 해석으로의 확장이 가능하며 궁극적으로는 습표면 열교환기의 응축수에 대한 표면 형상을 해석하는데 응용될 수 있다. A numerical algorithm based on a perturbation method was used to determine the free-surface profile for the shape analysis of water condensation on a heat exchanger surface. The perturbation of a stream function, which has the solution satisfying both the kinematic and dynamic boundary conditions, is obtained for an assumed free-surface profile. The analysis results are verified by comparing analytical solutions for the two-dimensional potential flow. The developed algorithm can be extended to determine the free-surface profile of flow including a nonlinear inertia term and applied to solve the surface profile of condensation water on a heat exchanger surface under wet conditions.
Area function을 이용한 音聲合成에 관한 연구
林雲千(Un Cheen Lian) 호서대학교 사회과학연구소 1985 社會科學硏究 Vol.4 No.1
Using Area function contour of Acoustic tube modelling we can reduce the data size for phonemic approach of speech synthesis.
Bone Scintigraphy and Tenofovir-Induced Osteomalacia in Chronic Hepatitis B
Alex Khoo Cheen Hoe,Lee Yeong Fong 대한핵의학회 2017 핵의학 분자영상 Vol.51 No.2
Tenofovir, used in the treatment of chronichepatitis B and HIV, is known for its side effects onthe kidneys and bones. We share interesting images of apatient with tenofovir-induced osteomalacia onTechnetium-99 m hydroxymethyelene (Tc-99 m HDP)bone scintigraphy. Pattern recognition of this bonescintigraphy and correlation with the clinical history isessential to avoid misdiagnosis.
Liew Amy Kia Cheen,Yeh Yi-Chun,Abdullah Dalia,Tu Yu-Kang 대한치과보존학회 2021 Restorative Dentistry & Endodontics Vol.46 No.3
Objectives This study aimed to evaluate the efficacy of various local anesthesia (LA) in vital asymptomatic teeth. Materials and Methods Randomized controlled trials comparing pulpal anesthesia of various LA on vital asymptomatic teeth were included in this review. Searches were conducted in the Cochrane CENTRAL, MEDLINE (via PubMed), EMBASE, ClinicalTrials.gov, Google Scholar and 3 field-specific journals from inception to May 3, 2019. Study selection, data extraction, and risk of bias assessment using Cochrane Risk of Bias Tool were done by 2 independent reviewers in duplicate. Network meta-analysis (NMA) was performed within the frequentist setting using STATA 15.0. The LA was ranked, and the surface under the cumulative ranking (SUCRA) line was plotted. The confidence of the NMA estimates was assessed using the CINeMA web application. Results The literature search yielded 1,678 potentially eligible reports, but only 42 were included in this review. For maxillary buccal infiltration, articaine 4% with epinephrine 1:100,000 was more efficacious than lidocaine 2% with epinephrine 1:100,000 (odds ratio, 2.11; 95% confidence interval, 1.14–3.89). For mandibular buccal infiltration, articaine 4% with epinephrine 1:100,000 was more efficacious than various lidocaine solutions. The SUCRA ranking was highest for articaine 4% with epinephrine when used as maxillary and mandibular buccal infiltrations, and lidocaine 2% with epinephrine 1:80,000 when used as inferior alveolar nerve block. Inconsistency and imprecision were detected in some of the NMA estimates. Conclusions Articaine 4% with epinephrine is superior when maxillary or mandibular infiltration is required in vital asymptomatic teeth. Objectives This study aimed to evaluate the efficacy of various local anesthesia (LA) in vital asymptomatic teeth. Materials and Methods Randomized controlled trials comparing pulpal anesthesia of various LA on vital asymptomatic teeth were included in this review. Searches were conducted in the Cochrane CENTRAL, MEDLINE (via PubMed), EMBASE, ClinicalTrials.gov, Google Scholar and 3 field-specific journals from inception to May 3, 2019. Study selection, data extraction, and risk of bias assessment using Cochrane Risk of Bias Tool were done by 2 independent reviewers in duplicate. Network meta-analysis (NMA) was performed within the frequentist setting using STATA 15.0. The LA was ranked, and the surface under the cumulative ranking (SUCRA) line was plotted. The confidence of the NMA estimates was assessed using the CINeMA web application. Results The literature search yielded 1,678 potentially eligible reports, but only 42 were included in this review. For maxillary buccal infiltration, articaine 4% with epinephrine 1:100,000 was more efficacious than lidocaine 2% with epinephrine 1:100,000 (odds ratio, 2.11; 95% confidence interval, 1.14–3.89). For mandibular buccal infiltration, articaine 4% with epinephrine 1:100,000 was more efficacious than various lidocaine solutions. The SUCRA ranking was highest for articaine 4% with epinephrine when used as maxillary and mandibular buccal infiltrations, and lidocaine 2% with epinephrine 1:80,000 when used as inferior alveolar nerve block. Inconsistency and imprecision were detected in some of the NMA estimates. Conclusions Articaine 4% with epinephrine is superior when maxillary or mandibular infiltration is required in vital asymptomatic teeth.