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P-125 : Evaluation of Membrane Fouling Index for Secondary Wastewater
류동완,김태원,이대행,이재욱,문희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
The performance of membrane operation is often reduced because of concentration polarization and fouling, which causes continuous flux decline. Fouling phenomena have been characterized by using many parameters such as the silting index, plugging index, fouling index and membrane filtration index. The general limitation of these methods is the requirement of long time. Hence, studies were carried out to minimize the time required to evaluate the fouling index by combining the pressure variation and effluent volume obtained for short time, under various operating conditions including powdered activated carbon dose, permeate flow rate, pH of the feed solution, feed temperature etc. Results showed that flux decline for secondary domestic wastewater was highly dependent on the powdered activated carbon dose. Especially, the proposed method considerably reduced the measuring time for determining the fouling index.
류동완,박찬영 경북대학교 센서기술연구소 1990 센서技術學術大會論文集 Vol.1 No.1
High speed type isothermal calorimeter was designed and constructed using an analog circuit and a digital computer. The analog circuit measures the differential variations in temperature of the isothermal calorimeter in real time, and the computer receives the changes via an interface (IEEE-488). The information comming from the circuit is used to computer simulation which is analysing the heat of reaction, the heat capacity of the reaction mixture, and finally the change of compositions in the calorimeter. In order to trace and control the dynamic differential change of the physical and chemical properties in the calorimeter, an algorithm was developed which is necessary for the receiving input signal from the analog circuit, for the simulations of the reaction scheme ,and for the calorimeter actions, respectively. After the estimation of the parameters affecting the calorimeter's action by employing water as an standard material for the calibration, the sample run employing both of 2-methyl furan and maleic anhydride in dioxane medium as a sample reaction was performed. The response data obtained from the calorimeter were compared with the simulated ones. Consequently the energy storage capacity of the mixture, the heat of reaction of the reaction, the equilibrium constant of the reaction, and the reaction rate could estimated within 0.5 % accuracy.
생리 활성 세라믹 분말이 첨가된 포장용 LDPE 필름의 새로운 에틸렌 평형 용해 모델
류동완,정재철,심승우,박찬영 전남대학교 촉매연구소 2000 觸媒硏究 論文集 Vol.21 No.-
This work investigates a new model that predicts the equilibrium solubility of gaseous component with polymer film. The new model regards the gas concentration in fluid phase as depressing factor in desorption from the surface of the film. The final mathematical form describes actual observation well with its second order form. The over all figure of the equilibrium solubility is sigmoid that one sees frequently in experiments. The only disadvantage of this model is the bulk concentration appears in denominator that induces the expression becomes infinite if the concentration is none. Insertion of one constant added to the concentration term in the denominator defeats this shortcoming. The following is the mathmatical form of the net rate of dissolution and the equilibrium solubility, respectively. □ Also, this paper presents the logical method obtaining the parameters from the experimental equilibrium data for the ethylene dissolution in LDPE film that had incorporated a ceramic powder with selective gas permeability. Finally, the dependency of the equilibrium parameters, KA, Cmax, the others to the weight fraction of the powder and appears to be linear and presented to follow : The parameters were calculated by soluble equilibrium constant, KA, maximum soluble concentration, Cmax and soluble rate constant, k+ for ethylene gas permeated through LDPE packaging films containing the ceramic powders 0∼6wt% at 20℃, the above model being applied. The values showed 1.45×106∼3.70×106[(㎤/mol)2], 2.30×10-3~2.92×10-3 [mo1/㎠sec]and 0.273∼0.405[㎤/mol sec], respectively.
Implementation of Indoor Localization System
류동완,김선형,정동규 한국인터넷방송통신학회 2019 Journal of Advanced Smart Convergence Vol.8 No.3
In this paper, a localization system for indoor objects is proposed. The proposed system consists of Beacons, LED Cells, Main Cell Controller (MCC), and Display. A Beacon is attached at each indoor object, and each LED cell has Beacon Scanner and VLC Transmitter. The Visual Light Communications (VLC) and Power Line Communications (PLC) methods are used to communicate the signals for localization of indoor objects. And the proposed system is designed, and implemented as a prototype. To certify that our propose d system can exactly localize a given indoor object, we take test for the implemented system as a p rototype. Here the location of the given indoor object is known. Test is done in two ways. The first is to check the operation of the detail of the system, and the second is the position recognition of i ndoor object. The second is the test of the implemented system to correctly detect the location of the indoor object with Beacon, while the object with Beacon is moved from location C to A. The experimental result shows that the system is exactly detect the moving locations. The system has the advantages of using previously installed power lines, and it does not need to use LAN lines or optical cables. The proposed system is usefully applied to indoor object localization area.