EXISTENCE OF SOLUTIONS FOR BOUNDARY VALUE PROBLEMS VIA F-CONTRACTION MAPPINGS IN METRIC SPACES

Komi Afassinou,Ojen Kumar Narain 경남대학교 기초과학연구소 2020 Nonlinear Functional Analysis and Applications Vol.25 No.2

The purpose of this paper is to present some sufficient conditions for the existence and uniqueness of solutions of the nonlinear Hammerstein integral equations and thetwo-point boundary value problems for nonlinear second-ordinary differential equations. Toestablish this, we introduce the generalized Suzuki-(α, β)-F-contraction and the generalized(α, β)-F-contraction in the framework of a metric space and establish some fixed point results. The results obtained in this work provide extension as well as substantial generalizationand improvement of several well-known results on fixed point theory and its applications.

ITERATIVE ALGORITHM FOR APPROXIMATING SOLUTIONS OF SPLIT MONOTONE VARIATIONAL INCLUSION, VARIATIONAL INEQUALITY AND FIXED POINT PROBLEMS IN REAL HILBERT SPACES

Komi Afassinou,Ojen Kumar Narain,Oluwaseun Elizabeth Otunuga 경남대학교 기초과학연구소 2020 Nonlinear Functional Analysis and Applications Vol.25 No.3

The goal of this paper is to introduce a modified Halpern iterative algorithm for approximating solutions of split monotone variational inclusion, variational inequality and fixed point problems of an infinite families of multi-valued type-one demicontractive mappings in the framework of real Hilbert spaces. Using our iterative algorithm, we state and prove a strong convergence result for approximating a common solution of split monotone variational inclusion, variational inequality problems and fixed point problem for countable family of multi-valued type-one demicontractive mappings. The iterative algorithm employed in this paper is designed in such a way that it does not require the knowledge of operator norm. Lastly, we give some consequences of our main result and give application of one of the consequences to split minimization problem. The result presented in this paper extends and generalizes some related results in literature.

古代朝鮮半島の国名を付した「国記」について - 編纂とその背景をめぐって -

Komi ya, Hi detaka 계명대학교 인문과학연구소 2015 동서인문학 Vol.0 No.50

Gukgi (國記) means a book on a kingdom. Ancient China had written some books named gukgi. This article investigated the books named gukgi on kingdoms of ancient Korea. These are divided into two groups. Suksingukgi (≷肅愼國記≸) is a compilation of envoy’s knowledge and records on relations from the beginning. On the contrary, Goryeogi (≷高麗記≸), Sillagukgi (≷新羅國記≸), and Balhaegukgi (≷渤海國記≸) are just records of envoy to prepare for war or negotiation. Suksingukgi was written because Jin dynasty needed more informations on Suksin with increasing frequency of contact with it. The others were written to handle the disputes with the kingdoms. Tang dynasty’s ministry of foreign affairs was already accumulating the records on the kingdoms through the visiting envoys. The purpose of writing affected the use of the book. The most part of Suksingukgi was copied in the Book of Jin. However, Goryeogi, Sillagukgi, and Balhaegukgi were partly used in the compilation of the Book of Tang and the New Book of Tang. Gukgi on kingdoms of ancient Korea shows Tang dynasty placed emphasis on the relations with them. 本稿は朝鮮半島の国名を付した国記に関する性格を検討したものであ る。国記にはおもに二つの性格が見られる。第一に≷粛慎国記≸のように、 同時代の記録だけでなく、前代の交渉記事を集積し、整理したものであ る。次に≷高麗記≸≷新羅国記≸≷渤海国記≸のように、同時代における特定の 目的をもって唐の使節がそれにあわせた収集をおこない整理をしたものが あげられる。 これら≷国記≸が国際関係的理由により作成された点は共通した特徴であ る。しかし、≷高麗記≸≷新羅国記≸≷渤海国記≸と≷粛慎国記≸の編纂理由は、 国際紛争の有無という点で違いがある。前者は、喫緊の国際紛争を解決す るための手段として、後者は中国との交渉増加を背景に編纂された。 こうした編纂の目的の相違は、その後の転載にも影響を及ぼしている。 ≷晋書≸粛慎伝は、≷粛慎国記≸の情報をほぼすべて掲載しているのに対し て、≷高麗記≸≷新羅国記≸≷渤海国記≸は限定的に使用されている。これは鴻 臚寺にて使節が往来するたびに国内の事情を毎年のように報告していたた め、≷粛慎国記≸のように情報の集積をする必要がなかったからである。こ れは、中韓の活発な交流とともに唐東方の国際関係上の重要性を意味する ものである。

BERINDE TYPE RESULTS VIA SIMULATION FUNCTIONS IN METRIC SPACES

Komi Afassinou,Jong Kyu Kim 경남대학교 기초과학연구소 2020 Nonlinear Functional Analysis and Applications Vol.25 No.3

In this paper, we introduce coincidence point theorems for Beride type contraction mappings via simulation functions and obtain some sufficient axioms for the existence and uniqueness of coincidence point for such class of mappings in the setting of metric spaces.

Through Optimization in Pipelined Data-Path Scheduling

Hiuonori Komi,Katsumi Harashima,Kunio Fukunaga 대한전자공학회 1993 JTC-CSCC : Joint Technical Conference on Circuits Vol.- No.-

Characterization of Novel Trichoderma asperellum Isolates to Select Effective Biocontrol Agents Against Tomato Fusarium Wilt

El_Komy, Mahmoud H.,Saleh, Amgad A.,Eranthodi, Anas,Molan, Younes Y. The Korean Society of Plant Pathology 2015 Plant Pathology Journal Vol.31 No.1

The use of novel isolates of Trichoderma with efficient antagonistic capacity against Fusarium oxysporum f. sp. lycopersici (FOL) is a promising alternative strategy to pesticides for tomato wilt management. We evaluated the antagonistic activity of 30 isolates of T. asperellum against 4 different isolates of FOL. The production of extracellular cell wall degrading enzymes of the antagonistic isolates was also measured. The random amplified polymorphic DNA (RAPD) method was applied to assess the genetic variability among the T. asperellum isolates. All of the T. asperellum isolates significantly reduced the mycelial growth of FOL isolates but the amount of growth reduction varied significantly as well. There was a correlation between the antagonistic capacity of T. asperellum isolates towards FOL and their lytic enzyme production. Isolates showing high levels of chitinase and ${\beta}$-1,3-glucanase activities strongly inhibited the growth of FOL isolates. RAPD analysis showed a high level of genetic variation among T. asperellum isolates. The UPGMA dendrogram revealed that T. asperellum isolates could not be grouped by their antagonistic behavior or lytic enzymes production. Six isolates of T. asperellum were highly antagonistic towards FOL and potentially could be used in commercial agriculture to control tomato wilt. Our results are consistent with the conclusion that understanding the genetic variation within Trichoderma isolates and their biochemical capabilities are required for the selection of effective indigenous fungal strains for the use as biocontrol agents.

Comparative Analysis of Defense Responses in Chocolate Spot-Resistant and -Susceptible Faba Bean (Vicia faba) Cultivars Following Infection by the Necrotrophic Fungus Botrytis fabae

El-Komy, Mahmoud H. The Korean Society of Plant Pathology 2014 Plant Pathology Journal Vol.30 No.4

In this study, resistance responses were investigated during the interaction of Botrytis fabae with two faba bean cultivars expressing different levels of resistance against this pathogen, Nubaria (resistant) and Giza 40 (susceptible). Disease severity was assessed on leaves using a rating scale from 1 to 9. Accumulation levels of reactive oxygen species (ROS), lipid peroxidation and antioxidant enzymes (superoxide dismutase, catalase and ascorbate peroxidase) were measured in leaf tissues at different times of infection. The expression profiles of two pathogenesis-related proteins (PRPs) encoded by the genes PR-1 and ${\beta}$-1,3-glucanase were also investigated using reverse transcription RT-PCR analysis. The accumulation of these defense responses was induced significantly in both cultivars upon infection with B. fabae compared with un-inoculated controls. The resistant cultivar showed weaker necrotic symptom expression, less ROS accumulation, a lower rate of lipid peroxidation and higher activity of the enzymatic ROS scavenging system compared with susceptible cultivar. Interestingly, ROS accumulated rapidly in the resistant leaf tissues and peaked during the early stages of infection, whereas accumulation was stronger and more intense in the susceptible tissues in later stages. Moreover, the response of the resistant cultivar to infection was earlier and stronger, exhibiting high transcript accumulation of the PR genes. These results indicated that the induction of oxidant/antioxidant responses and the accumulation of PRPs are part of the faba bean defense mechanism against the necrotrophic fungus B. fabae with a different intensity and timing of induction, depending on the resistance levels.

기후와 지형 조건을 반영한 우리나라 주요 수종의 반경 생장 반응 예측

최고미(Choi, Komi),김문일(Kim, Moonil),이우균(Lee, Woo-Kyun),강현우(Gang, Hyeon-u),정동준(Chung, Dong-Jun),고은진(Ko, Eun-jin),윤병현(Yun, Byung-Hyun),김찬회(Kim, Chan-Hoe) 한국기후변화학회 2014 한국기후변화학회지 Vol.5 No.2

Comparative Analysis of Defense Responses in Chocolate Spot-Resistant and -Susceptible Faba Bean (Vicia faba) Cultivars Following Infection by the Necrotrophic Fungus Botrytis fabae

Mahmoud H. El-Komy 한국식물병리학회 2014 Plant Pathology Journal Vol.30 No.4

In this study, resistance responses were investigatedduring the interaction of Botrytis fabae with two fababean cultivars expressing different levels of resistanceagainst this pathogen, Nubaria (resistant) and Giza 40(susceptible). Disease severity was assessed on leavesusing a rating scale from 1 to 9. Accumulation levels ofreactive oxygen species (ROS), lipid peroxidation andantioxidant enzymes (superoxide dismutase, catalaseand ascorbate peroxidase) were measured in leaf tissuesat different times of infection. The expression profilesof two pathogenesis-related proteins (PRPs) encodedby the genes PR-1 and β-1,3-glucanase were also investigatedusing reverse transcription RT-PCR analysis. The accumulation of these defense responses was inducedsignificantly in both cultivars upon infection withB. fabae compared with un-inoculated controls. Theresistant cultivar showed weaker necrotic symptomexpression, less ROS accumulation, a lower rate of lipidperoxidation and higher activity of the enzymatic ROSscavenging system compared with susceptible cultivar. Interestingly, ROS accumulated rapidly in the resistantleaf tissues and peaked during the early stages of infection,whereas accumulation was stronger and moreintense in the susceptible tissues in later stages. Moreover,the response of the resistant cultivar to infectionwas earlier and stronger, exhibiting high transcriptaccumulation of the PR genes. These results indicatedthat the induction of oxidant/antioxidant responses andthe accumulation of PRPs are part of the faba beandefense mechanism against the necrotrophic fungus B. fabae with a different intensity and timing of induction,depending on the resistance levels.

Characterization of Novel Trichoderma asperellum Isolates to Select Effective Biocontrol Agents Against Tomato Fusarium Wilt

Mahmoud H. El_Komy,Amgad A. Saleh,Anas Eranthodi,Younes Y. Molan 한국식물병리학회 2015 Plant Pathology Journal Vol.31 No.1

The use of novel isolates of Trichoderma with efficient antagonistic capacity against Fusarium oxysporum f. sp. lycopersici (FOL) is a promising alternative strategy to pesticides for tomato wilt management. We evaluated the antagonistic activity of 30 isolates of T. asperellum against 4 different isolates of FOL. The production of extracellular cell wall degrading enzymes of the antagonistic isolates was also measured. The random amplified polymorphic DNA (RAPD) method was applied to assess the genetic variability among the T. asperellum isolates. All of the T. asperellum isolates significantly reduced the mycelial growth of FOL isolates but the amount of growth reduction varied significantly as well. There was a correlation between the antagonistic capacity of T. asperellum isolates towards FOL and their lytic enzyme production. Isolates showing high levels of chitinase and β-1,3-glucanase activities strongly inhibited the growth of FOL isolates. RAPD analysis showed a high level of genetic variation among T. asperellum isolates. The UPGMA dendrogram revealed that T. asperellum isolates could not be grouped by their antagonistic behavior or lytic enzymes production. Six isolates of T. asperellum were highly antagonistic towards FOL and potentially could be used in commercial agriculture to control tomato wilt. Our results are consistent with the conclusion that understanding the genetic variation within Trichoderma isolates and their biochemical capabilities are required for the selection of effective indigenous fungal strains for the use as biocontrol agents.