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김홍재,이창주,나건 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
Reactive oxygen species (ROS) generation occurs oxidative stress to cells. It makes cell aging, disorder and death. Thus there are many studies to remove ROS using antioxidant agents. Researchers want to apply these agent in physiological environment. However, some of the antioxidant agents are unstable in a physiological environment (pH7.4) and easily destroyed during formulation. These problems should be solved for bio-application of antioxidant agents. To preserve their antioxidant ability, we used nanoparticle to formulate them. It makes more stable in pH 7.4 compare to unformulated antioxidant agents. Furthermore we tried another loading method, rather than passive loading. It comes 2-folded high loading efficiency of nanoparticle. Also, in release test, loaded antioxidant agents release slowly over 14 days. It means that antioxidant capacity maintain for a long time. Consequently, antioxidant agent loaded nanoparticle is effect on stability in physiological environment.
김홍재,박혜진,박형,나건 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In recent years, Photo Dynamic Therapy (PDT) has been proposed their potentials to treat acne using Photosensitizer(PS) or PS-conjugated drugs. However, drug resistance and side-effects are acting as barriers in their bio-application. In this study, we solve these problems to fabricate nanoparticles which loaded polymer-conjugated PS for enhencing skin cell penetration. After irradiation of specific wave lengh, there are remarkable results in PS loaded nanoparticle group. Using Franz cell diffusion system, we compare the tissue penetration efficiency between free PS and PS loaded nanoparticles. As a result, PS loaded nanoparticles group has higher skin permeability than free PS group. In addition, PS loaded nanoparticles group exhibited the 2-fold, 1.5-fold higher toxicity of acnes than conventional antibiotics group and PS conjugated with cationic polymers group. Consequently, PDT with PS loaded nanoparticles is effective for the treatment of acnes.
김홍재,강창민,오준성,황민진 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
In order to prevent harmful effects on humans and environment, carwash wastewaters have to treat before discharging into the surface water bodies because they contain various pollutants such as detergents, oil, grease, chemicals and road grime, and heavy metals, etc. In this study, the microbubbles were employed to separate for suspended particles include the oils, dusts, and detergents without any coagulants. During the flotation process, the small amounts of oxidation agent such as ozone gas was introduced with air for facilitate of pollutants disintegration. The disintegrated pollutants from oils and detergents were used as biodegradable carbon sources in soil covered oxidation process (SCOP). The experimental results demonstrated the efficiency of the flotation, ozonation, and SCOP in removing suspended solids and chemical contaminants from real carwash wastewater.
Human Factor를 고려한 최적관리모델의 탄력체계에 관한 연구
金洪材 건국대학교 1991 대학원 학술논문집 Vol.33 No.-
This thesis intends to design the Aggregate optimum management model through human factor which is main characteristic of cybernetics information system The present optimum management models are described for modeling tasks in diverse management spheres characterized by cost-oriented and one-point discrete target. The method has been used to elicit static problems of the general parts of production control and operation management. These subjects are inevitably faced with dynamic environments. The outcome of management activities is also at the mercy of these dynamic factors. There are three sourses of factor to consider in aggregate-optimum manegement for elastic systems:Human factor, productivity, and cost. Especially human factors as a independent variable are lacking in various situations but very important. Attributes of human factors in itself construct the elasticity which is explained by negative feedback. Most consequent human factors by the view point cybernetics are optimal feedback control, stability, equilibrium, steady-sate, isomorphism, homomorphism, syntality, homeostasis, reverberation, echolocation, learning, perturbation, and self-reproducing automata. These traits draw a conclusion to damped oscillation. The elastic system of optimum management model based on Human factors through the damped oscilation validate the new horizen of management strategy and generate the creative-valued productivity.
金洪材,李太熙 건국대학교 1993 대학원 학술논문집 Vol.37 No.-
This Paper is focused on the Elastic Function's Approach of Human Behavior Characteristics for Managerial Effectiveness. The Human Behavior in aspect of management is very changeable and diverse. Therefore, it is very difficult to grope the its characteristic. A Theory and model, based on Human Behavior and Psychology, can explain the important factors of behavior characteristics. For analyzing these facts, following theorems should be considered : Weber-Fechner's law, Markov process, Interest Ratio, Learning theory, Random Walk theory. These important facts resulted to Eigenvalue and Eigenvector problem. Because of the Eigenvalue and Eigenvector explain the mode of variat1on and the velocity of variation respectively. Further sensitivity analysis for Eigenvalue and E1genvector get hold of variable characteristic factor. This characteristic factor can be generalized by Elastic Function. That is, Elastic Function is important instrument of variation analysis for forecasting and control of management.