Structural Object Recognition Using Entropy Correspondence Measure of Line Features

KO, San,LEE, Kyoung Mu The Institute of Electronics, Information and Comm 2008 IEICE transactions on information and systems Vol.91 No.1

<P>In this paper we propose an efficient line feature-based 2D object recognition algorithm using a novel entropy correspondence measure (ECM) that encodes the probabilistic similarity between two line feature sets. Since the proposed ECM-based method uses the whole structural information of objects simultaneously for matching, it overcomes the common drawbacks of the conventional techniques that are based on feature to feature correspondence. Moreover, since ECM is endowed with probabilistic attribute, it shows quite robust performance in the noisy environment. In order to enhance the recognition performance and speed, line features are pre-clustered into several groups according to their inclination by an eigen analysis, and then ECM is applied to each corresponding group individually. Experimental results on real images demonstrate that the proposed algorithm has superior performance to those of the conventional algorithms in both the accuracy and the computational efficiency, in the noisy environment.</P>

Modules Which Are Lifting Relative To Module Classes

Kosan, Muhammet Tamer,Harmanci, Abdullah Department of Mathematics 2008 Kyungpook mathematical journal Vol.48 No.1

In this paper, we study a module which is lifting and supplemented relative to a module class. Let R be a ring, and let X be a class of R-modules. We will define X-lifting modules and X-supplemented modules. Several properties of these modules are proved. We also obtain results for the case of specific classes of modules.

Dynamic Modeling and Control Studies for the Elevated Pressure Air Separation Unit in an IGCC Power Plant

Kosan Roh,Hyojin Lee,Jay H. Lee 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10

IGCC (Integrated Gasification Combined Cycle) power plant is one of the promising power generation systems for the future as it can utilize the plentiful resource of coal in an eco-friendly way. The IGCC system is more complicated than the conventional pulverized coal power plant, so its dynamics should be investigated and an appropriate control strategy must be devised to ensure stable and efficient operation. In this research, Elevated Pressure Air Separation Unit (EP ASU) in an IGCC power plant is studied from the viewpoint of dynamic systems analysis. EP ASU separates cryogenic air feed into oxygen and nitrogen in a high pressure column and sends them to the gasification unit and gas turbine. Equation-based modeling of the cryogenic rectification column in EP ASU has been carried out using the software platform of gPROMS. Also, the transient behavior in response to various disturbances is studied through the dynamic simulation. Based on dynamic analysis, a control strategy is suggested at the end.

INDEPENDENTLY GENERATED MODULES

Kosan, Muhammet Tamer,Ozdin, Tufan Korean Mathematical Society 2009 대한수학회보 Vol.46 No.5

A module M over a ring R is said to satisfy (P) if every generating set of M contains an independent generating set. The following results are proved; (1) Let $\tau$ = ($\mathbb{T}_\tau,\;\mathbb{F}_\tau$) be a hereditary torsion theory such that $\mathbb{T}_\tau$ $\neq$ Mod-R. Then every $\tau$-torsionfree R-module satisfies (P) if and only if S = R/$\tau$(R) is a division ring. (2) Let $\mathcal{K}$ be a hereditary pre-torsion class of modules. Then every module in $\mathcal{K}$ satisfies (P) if and only if either $\mathcal{K}$ = {0} or S = R/$Soc_\mathcal{K}$(R) is a division ring, where $Soc_\mathcal{K}$(R) = $\cap${I 4\leq$ $R_R$ : R/I$\in\mathcal{K}$}.

Control Structure Selection for the Elevated-Pressure Air Separation Unit in an IGCC Power Plant: Self-Optimizing Control Structure for Economical Operation

Roh, Kosan,Lee, Jay H. American Chemical Society 2014 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.53 No.18

<P>The air separation unit (ASU) is one of the core elements of integrated gasification combined cycle (IGCC) power plants. The ASU separates air into pure oxygen and nitrogen, to be sent to the gasifier and the gas turbine, respectively. This system consumes about 10% of the gross power output generated in IGCC, so its economical operation is important for lowering the overall power generation cost. The use of an elevated-pressure air separation unit (EP ASU), in which the operating pressure is higher than in a conventional ASU, is known to lead to significant energy savings. In this research, controlled variable selection for an EP ASU was studied, considering both the controllability and economics, that is, with the objective of maintaining economically near-optimal operations in the presence of anticipated load changes. The main tool used for this was the so-called “minimum singular value rule” within the overall framework of self-optimizing control (SOC). For the purpose of selecting and testing self-optimizing control structures, equation-based modeling of EP ASU was carried out and implemented on the commercial software platform gPROMS. Then, the minimum singular value rule was applied using steady-state gain matrices (obtained from the simulator) to select a small number of candidate sets for controlled variables, to which rigorous analyses based on nonlinear simulation and optimization could be applied to pick the top choice. Before the minimum singular value rule was applied, however, certain process insights and heuristics were used to reduce the number of candidate sets down to a manageable level. The economic losses as a result of adopting a fixed control structure were assessed by comparing the hourly operating costs achieved under SOC with the equivalent values obtained by performing full nonlinear optimizations for the given scenarios. In addition, for the suggested control structure, proportional plus integral (PI) control loops were designed, and their dynamic performance was tested in order to make sure that it is attractive in terms of not only economics but also controllability. The finally selected control structure is compared with those presented in previous works.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie402909j'>ACS Electronic Supporting Info</A></P>

Antioxidant and Antimicrobial Properties of Some Lichens and Their Constituents

Marijana Kosanic,Branislav Rankovic' 한국식품영양과학회 2011 Journal of medicinal food Vol.14 No.12

The aim of this study is to examine the in vitro antioxidant and antimicrobial activities of the acetone,methanol, and aqueous extracts of the lichens Cladonia furcata (many-forked Cladonia), Hypogymnia physodes (puffed lichen), and Umbilicaria polyphylla (manyleaf navel lichen) and the antimicrobial activity of fumarprotocetraric acid, gyrophoric acid, and physodic acid isolated from the respective lichen species. Antioxidant activity was evaluated by five different methods: free radical scavenging, superoxide anion radical scavenging, reducing power, determination of total phenolic compounds, and determination of total flavonoid content. U. polyphyla exhibited more powerful antioxidant activities than the other lichen species examined: methanol extracts of U. polyphyla showed 90.08% free radical scavenging activities (the ratio was greater than those of standard antioxidants). Moreover, the extracts tested had effective reducing power and superoxide anion radical scavenging. Total contents of phenol and flavonoid in extracts were determined as pyrocatechol equivalents and as rutin equivalents, respectively. A significant strong relationship between total phenolic and flavonoid contents and their antioxidative activities was observed. The antimicrobial activity was estimated by determination of the minimal inhibitory concentration by the broth microdilution method against six species of bacteria and 10 species of fungi. In general, the lichen extracts tested and their respective acids had relatively strong antimicrobial activity against the microorganisms tested. The present study shows that the lichen species tested demonstrated strong antioxidant and antimicrobial activities. The results suggest that lichens may be used as good sources of natural antioxidants and for pharmaceutical purposes in treating various diseases.

Sustainability analysis of CO₂ capture and utilization processes using a computer-aided tool

Roh, Kosan,Lim, Hyungmuk,Chung, Wonseok,Oh, Jaewoo,Yoo, Haeun,Al-Hunaidy, Ali S.,Imran, Hasan,Lee, Jay H. Elsevier 2018 Journal of CO₂ utilization Vol.26 No.-

<P><B>Abstract</B></P> <P>CO<SUB>2</SUB> capture and utilization technologies (CCU) are recently attracting attention as ways to reduce CO<SUB>2</SUB> emission and generate economic benefits at the same time. Since numerous potential products from CO<SUB>2</SUB> may be considered and multiple processing pathways are possible for each product, there is a growing demand for a tool that can aid in techno-economic and life cycle CO<SUB>2</SUB> analyses of a large number of CCU options, in order to identify promising ones. This work introduces a computer-aided analysis tool called ArKa-TAC<SUP>3</SUP> tailored for this purpose. ArKa-TAC<SUP>3</SUP> can calculate both techno-economic and CO<SUB>2</SUB> reduction metrics of CCU processes in a fast and convenient manner. Sufficient flexibility is assured by adopting a superstructure model framework, which allows the user to conveniently describe a CCU processing network composed of multiple processing steps with a large number of technical options. To demonstrate the tool, a CCU process of acetic acid production is designed and its sustainability is analyzed by using it. By implementing the designed process in four different countries, it is verified that the CCU process can be made sustainable by adopting the process substitution strategies its implementation. Some perspectives on potential applications of the developed tool are given.</P> <P><B>Highlights</B></P> <P> <UL> <LI> ArKa-TAC<SUP>3</SUP>, a computer-aided analysis tool tailored to CCU processes is developed. </LI> <LI> Multiple CCU paths can be handled by adopting superstructure model framework. </LI> <LI> Techno-economic and CO<SUB>2</SUB> reduction metrics of CCU processes cab be calculated simultaneously. </LI> <LI> Implementation of a CO<SUB>2</SUB>-based acetic acid plant in four different countries is examined. </LI> </UL> </P>

A methodological framework for the development of feasible CO₂ conversion processes

Roh, Kosan,Lee, Jay H.,Gani, Rafiqul Elsevier 2016 INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL Vol.47 No.-

<P><B>Abstract</B></P> <P>Converting captured CO<SUB>2</SUB> feedstock into valuable chemical products is viewed as one of the potential ways to reduce atmospheric CO<SUB>2</SUB> emission. To this end, a methodological framework is suggested to support the development of feasible CO<SUB>2</SUB> conversion processes that can contribute to the CO<SUB>2</SUB> reduction by replacing non-CO<SUB>2</SUB> utilizing processes or non CO<SUB>2</SUB>-based products. The framework encompasses several execution and decision steps and uses three main criteria, which are the demand availability, CO<SUB>2</SUB> reduction feasibility, and economic feasibility. As an illustrative example, a methanol plant employing combined reforming (CR) of methane reaction is developed. To supply the CO<SUB>2</SUB> feedstock, the aMDEA-based CO<SUB>2</SUB> capture applied to a SMR-based H<SUB>2</SUB> plant is considered. A baseline process is developed and is compared with a non-CO<SUB>2</SUB> utilizing conventional methanol plant (process substitution) and a gasoline production process (product substitution) in terms of the established criteria. For the former, it is verified that the methanol production via combined reforming leads to cheaper unit production cost as well as lower net CO<SUB>2</SUB> emission compared to the conventional methanol plant. For the latter, it is shown that the feasibility of the CO<SUB>2</SUB>-based methanol as an alternative fuel to gasoline highly depends on the type and price of the raw materials. To improve the developed baseline CO<SUB>2</SUB> conversion process further, (1) some of the combined reforming reaction related design variables are fine-tuned using a sensitivity analysis and an equilibrated syngas plot, and (2) utilization of various renewable energy resources for the internal electricity demand is examined.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A methodological framework for feasible CO<SUB>2</SUB> conversion process development. </LI> <LI> Replacement of a conventional methanol plant by the CO<SUB>2</SUB> conversion process. </LI> <LI> Replacement of gasoline by the CO<SUB>2</SUB>-based methanol. </LI> <LI> Reduction of net CO<SUB>2</SUB> emission of the developed process through a graphical approach. </LI> <LI> Utilization of various renewable energy resources for internal electricity demand. </LI> </UL> </P>

三國佛敎の現況と將來

安居香山(Yasui Kosan) 원광대학교 종교문제연구소 1988 한국종교 Vol.13 No.-

Independently generated modules

Muhammet Tamer Kosan,Tufan Özdin 대한수학회 2009 대한수학회보 Vol.46 No.5

A module M over a ring R is said to satisfy (P) if every generating set of M contains an independent generating set. The following results are proved; (1) Let τ = (Tτ , Fτ ) be a hereditary torsion theory such that Tτ ≠ Mod-R. Then every τ-torsionfree R-module satisfies (P) if and only if S = R/τ(R) is a division ring. (2) Let K be a hereditary pre-torsion class of modules. Then every module in K satisfies (P) if and only if either K ={0} or S = R/ Soc_K(R) is a division ring, where Soc_K(R) = ∩{I≤ R_R : R/I ∈ K}. A module M over a ring R is said to satisfy (P) if every generating set of M contains an independent generating set. The following results are proved; (1) Let τ = (Tτ , Fτ ) be a hereditary torsion theory such that Tτ ≠ Mod-R. Then every τ-torsionfree R-module satisfies (P) if and only if S = R/τ(R) is a division ring. (2) Let K be a hereditary pre-torsion class of modules. Then every module in K satisfies (P) if and only if either K ={0} or S = R/ Soc_K(R) is a division ring, where Soc_K(R) = ∩{I≤ R_R : R/I ∈ K}.