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수복재료와 내가동연결장치가 IMZ 임프란트 보철물의 충격흡수효과에 미치는 영향
이수정,정찬목,전영찬,Lee, Su-Jeong,Chung, Chan-Mo,Jeon, Young-Chan 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.1
The purpose of this study was to evaluate the shock absorbing effect of 4 restorative materials and intramobile connector. The damping effect of four restorative materials used to veneer test crown rigidly connected to IMZ implant and subjected to an impact force was measured. These materials included a gold alloy(stabilor G) : a noble metal ceramic alloy(Degudent H) : porcelain(Duceram) : composite resin(Dentacolor). In addition, this study compared damping effect of same restoretive materials after using polyoxymethylene intramobile connector(POM IMC). The result of this study suggest that : In case of using metal IMC 1. Veneered composite resin(group IV) reduced the impact force by 75%, when compared to an equivalent thickness of porcelain(group III). Group IV reduced the impact force by 87% and 89%, respectively, when compared to Stabilor G(group I) and Degudent H(group II). 2. The impact force recorded was higher for the alloy with the higher elastic modulus.(Stabilor G, group I, Young's modulus 107 Gpa, versus Degudent H, Group II, Young's modulus 95 Gpa) 3. It took the longest time for composite resin veneered group(IV) to reach to peak force when compared group I, II, III. In case of using POM IMC 4. The mean impact force recorded were reduced by 79%(group I), 78%(group II), 69%(group III), 84%(group IV), respectively, when compared to using metal IMC. 5. The time required to reach the peak force were increased by 78%(group I, II) 87%(group III), 34%(group IV), respectively, when compared to using metal IMC>.
파라미터 추정을 이용한 산업용 회분식 반응기의 열수지 모델링 방법
이광순,이대욱,정찬목 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4
자켓이 달린 산업용 회분식 반응기의 공정분석과 제어계 개선을 위한 일반적인 열수지 동특성 모델을 제시하였다. 제시한 모델은 반응기와 자켓주위의 열수지식으로 구성되어 있으며 조정 파라미터로써 현장 운전 자료를 이용하여 쉽게 추정할 수 있는 총괄 열전달 계수를 가지고 있다. 자켓내부의 흐름을 관형 흐름 모델(Plug Flow Model, PFM) 또는 N개의 혼합 반응기가 직렬로 연결된 모델(N mixed-reactors-in-series, MFM)로 근사하여 자켓내의 온도 분포를 반영하였다. 산업용 고분자 중합 반응기인 EPS(Extended PolyStyrene) 반응기의 거동을 제시한 모델을 이용하여 예측하였다. 결과적으로, 현장 자료에 의해 조율된 모델이 실제 공정 자료를 매우 잘 예측하고 있음을 알 수 있었다. 또한, 자켓 내부의 온도 분포 예측성능은 MFM이 PFM에 비하여 매우 뛰어남을 알 수 있었다. We have proposed a generic dynamic heat balance model of industrial batch reactors with jacket for analyzing the processes and improving reactor control. The proposed model is composed of heat balances for the reactor and jacket and has one adjustable parameter, the overall heat transfer coefficient, which can be easily estimated using reactor operation data. The temperature distribution in the jacket was reflected in the model by approximating the flow phenomena as the plug flow model(PFM) or N mixed-reactors-in-series model(MFM). As an application, the model was used to predict the behaviors of an industrial EPS(Extended PolyStyrene) polymerization reactor. As a result, it was found that the model after tuning can predict the reactor behaviors very closely to the real data. And also we could find out that the prediction performance of MFM is much better than that of PFM.