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실내 라돈환경계의 선량감도분석에 의한 제어매개변수 모델링
주운표,장시영,김건중 대한방사선 방어학회 1991 방사선방어학회지 Vol.16 No.2
라돈 및 붕괴생성물*의 호흡에 의한 인체 피폭선량의 제어가능성을 찾기 위해 다음과 같은 과정을 거쳤다. 1) 라돈에 관련된 기존모델을 토양 기공모델, 실내붕괴 모델, 폐선량계산모델로 분류해석하고, 2) topology이론에 따라 물리유추개념으로써 회로망으로 전환하여, 라돈환경계통을 정식화, 검증계산을 거쳐, 3) 모의계산으로 선량감도를 분석하여 최적매개변수의 범위를 모색하였다. 매개변수인 환기율, 침적율, 부착율가 제어범위내 변화될 때, 정식화된 111원 연립방정식의 해를 구하여 선량감도를 분석하였으며, 제어매개변수의 선량감도에 의한 효과를 3차원으로 도식화하였다. 본 연구 수행결과, 제어매개변수 변화에 따른 실내의 222Rn 및 Rn-D*의 농도 변화과정은 새롭게 해석할 수 있는 벡터감도단층모형으로, 일부 제어매개변수의 조합변화에 따른 선량감도는 3차원 그래프모형으로 나타낼 수 있었다. 선량감도의 3차원 그래프에서는 실내환경의 대표적 매개변수 값 범위에서 변곡점이 나타났으며, 일반적으로 높은 환기조건(>h-1)하에서는 공기정화에 의하여 선량이 전반적으로 증가되나, 불충분한 환기조건(<0.5h-1)하에서는 공기정화에 의하여, 선량이 40%정도로 감소되는 것으로 나타났다. (라돈 및 붕괴생성물은 이하 222Rn 및 Rn-D로 통일한다.) This paper aimed to analyse dose sensitivity to the controllable parameters of indoor radon(222Rn) and its decay products(Rn-D) by applying the input-output linear system theory. Physical behaviors of 222Rn & Rn-D were analyzed in terms of 222Rn gas-generation, -migation and -infiltration to indoor environments, and the performance output-function, i.e. mean dose equivalent to Tracho-Bronchial(TB) lung region, was assessed to the following extented ranges of the controllable paramenters; a) the ventilation rate constant(λv): 0∼50[h-1]. b) the attachment rate constant(λa) : 0∼500[h-1]. c) the unattached-deposition rate constant(λ??) : 0∼50[h-1]. A linear input-output model was reconstructed from the original models in literatures, as follows, which was modified into the matrices consisting of 111 nodal equations ; a) indoor 222Rn & Rn-D Behaviour ; Jacobi-Porstendoerfer-Bruno model. b) lung dosimetry ; Jacobi-Eisfeld model. Some of the major findings, which identify the effectiveness of the model, were as follows. a) λv is most effective, dominant controllable parameters in dose reduction, if mechanical ventilation is applied, due to 222Rn gas removal effect. b) λa, depending on the air particle-concentration, reduces the dose somewhat within λv<1 h-1 range. However, the dose increases conversely, λv>1 h-1 range. c) λ?? reduces the dose linearly as λv does. Such dose(z-axis) senstivities could be understood with three-dimensional plots whose x,y-axes are combined 2 out of the 3 paramenters(λv, λa, λ??).
Factor Analysis of Linear Type Traits and Their Relation with Longevity in Brazilian Holstein Cattle
Kern, Elisandra Lurdes,Cobuci, Jaime Araujo,Costa, Claudio Napolis,Pimentel, Concepta Margaret McManus Asian Australasian Association of Animal Productio 2014 Animal Bioscience Vol.27 No.6
In this study we aimed to evaluate the reduction in dimensionality of 20 linear type traits and more final score in 14,943 Holstein cows in Brazil using factor analysis, and indicate their relationship with longevity and 305 d first lactation milk production. Low partial correlations (-0.19 to 0.38), the medium to high Kaiser sampling mean (0.79) and the significance of the Bartlett sphericity test (p<0.001), indicated correlations between type traits and the suitability of these data for a factor analysis, after the elimination of seven traits. Two factors had autovalues greater than one. The first included width and height of posterior udder, udder texture, udder cleft, loin strength, bone quality and final score. The second included stature, top line, chest width, body depth, fore udder attachment, angularity and final score. The linear regression of the factors on several measures of longevity and 305 d milk production showed that selection considering only the first factor should lead to improvements in longevity and 305 milk production.
( Kern Hee Chang ),( Yeon Tae Jeong ),( Chan Yeong Kwak ),( One Choi ),( Jung Hoe Kim ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.5
We have previously reported that N-acetylcysteine (NAC) not only delayed apoptosis but also enhanced the production of recombinant erythropoietin (EPO) in Chinese hamster ovary (CHO) cell culture. To investigate the production enhancement mechanism, the effects of similar thiolreducing agents were studied. Intriguingly, all mild reducing agents examined including mercaptoethanesulfonic acid (MESNA), thiolactic acid (TLA), and thioglycolate (TG) were shown to block apoptosis and increase EPO production. A pulse-chase study of EPO secretion revealed that all four thiol-reducing agents increased the EPO secretion rate; among them TLA showed the highest rate. In terms of product quality, the sialic acid content of the glycoprotein is one of the most important factors. It was reported that a number of glycoproteins produced by CHO cells often have incomplete sialylation, particularly under high-producing conditions. Human α2,3-sialyltransferase (α2,3-ST) was introduced into EPO-producing CHO cells in order to compensate for the reduced sialylation during supplementation with NAC. When α2,3-ST was expressed in the presence of NAC, reduced sialylation was restored and an even more sialylated EPO was produced. Thus, our study is significant in that it offers increased EPO production while still allowing the prevention of decreased sialylation of EPO.
Implementation and Comparison of Controllers for Planar Robots
Kern, John,Urrea, Claudio,Torres, Hugo The Korean Institute of Electrical Engineers 2017 Journal of Electrical Engineering & Technology Vol.12 No.2
The nonlinear behavior and the high performance requirement are the main problems that appear in the design of manipulator robots and their controllers. For that reason, the simulation, real-time execution and comparison of the performance of controllers applied to a robot with three degrees of freedom are presented. Five controllers are prepared to test the robot's dynamic model: predictive; hyperbolic sine-cosine; sliding mode; hybrid composed of a predictive + hyperbolic sine-cosine controller; and adaptive controller. A redundant robot, a communication and signal conditioning interface, and a simulator are developed by means of the MatLab/Simulink software, which allows analyzing the dynamic performance of the robot and of the designed controllers. The manipulator robot is made to follow a test trajectory which, thanks to the proposed controllers, it can do. The results of the performance of this manipulator and of its controllers, for each of the three joints, are compared by means of RMS indices, considering joint errors according to the imposed trajectory and to the controller used.