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APPROXIMATE ADDITIVE MAPPINGS IN 2-BANACH SPACES AND RELATED TOPICS: REVISITED
YUN, SUNGSIK The Kangwon-Kyungki Mathematical Society 2015 한국수학논문집 Vol.23 No.3
W. Park [J. Math. Anal. Appl. 376 (2011) 193-202] proved the Hyers-Ulam stability of the Cauchy functional equation, the Jensen functional equation and the quadratic functional equation in 2-Banach spaces. But there are serious problems in the control functions given in all theorems of the paper. In this paper, we correct the statements of these results and prove the corrected theorems. Moreover, we prove the superstability of the Cauchy functional equation, the Jensen functional equation and the quadratic functional equation in 2-Banach spaces under the original given conditions.
HYERS-ULAM STABILITY OF AN ADDITIVE (ρ1, ρ2)-FUNCTIONAL INEQUALITY IN BANACH SPACES
박춘길,Sungsik Yun 한국수학교육학회 2018 純粹 및 應用數學 Vol.25 No.2
In this paper, we introduce and solve the following additive (p1, p2)-functional inequality where p1 and p2 are fixed nonzero complex numbers with|p1 | + |p2|< 2. Using the fixed point method and the direct method, we prove the Hyers- Ulam stability of the additive (p1; p2)-functional inequality (0.1) in complex Banach spaces.
SDN과 허니팟 기반 동적 파라미터 조절을 통한 지능적 서비스 거부 공격 차단
윤준혁 ( Junhyeok Yun ),문성식 ( Sungsik Mun ),김미희 ( Mihui Kim ) 한국정보처리학회 2022 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.11 No.1
네트워크 기술의 발달로 그 적용 영역 또한 다양해지면서 다양한 목적의 프로토콜이 개발되고 트래픽의 양이 폭발적으로 증가하게 되었다. 따라서 기존의 전통적인 스위칭, 라우팅 방식으로는 네트워크 관리자가 망의 안정성과 보안 기준을 충족하기 어렵다. 소프트웨어 정의 네트워킹(SDN)은 이러한 문제를 해결하기 위해 제시된 새로운 네트워킹 패러다임이다. SDN은 네트워크 동작을 프로그래밍하여 효율적으로 네트워크를 관리할 수 있도록 한다. 이는 네트워크 관리자가 다양한 여러 양상의 공격에 대해서 유연한 대응을 할 수 있는 장점을 가진다. 본 논문에서는 SDN의 이러한 특성을 활용하여 SDN 구성 요소인 컨트롤러와 스위치를 통해 공격 정보를 수집하고 이를 기반으로 공격을 탐지하는 위협 레벨 관리 모듈, 공격 탐지 모듈, 패킷 통계 모듈, 플로우 규칙 생성기를 설계하여 프로그래밍하고 허니팟을 적용하여 지능형 공격자의 서비스 거부 공격(DoS)을 차단하는 방법을 제시한다. 제안 시스템에서 공격 패킷은 수정 가능한 플로우 규칙에 의해 허니팟으로 빠르게 전달될 수 있도록 하였으며, 공격 패킷을 전달받은 허니팟은 이를 기반으로 지능적 공격의 패턴을 분석하도록 하였다. 분석 결과에 따라 지능적 공격에 대응할 수 있도록 공격 탐지 모듈과 위협 레벨 관리 모듈을 조정한다. 제안 시스템을 실제로 구현하고 공격 패턴 및 공격 수준을 다양화한 지능적 공격을 수행하고 기존 시스템과 비교하여 공격 탐지율을 확인함으로써 제안 시스템의 성능과 실현 가능성을 보였다. With the development of network technology, the application area has also been diversified, and protocols for various purposes have been developed and the amount of traffic has exploded. Therefore, it is difficult for the network administrator to meet the stability and security standards of the network with the existing traditional switching and routing methods. Software Defined Networking (SDN) is a new networking paradigm proposed to solve this problem. SDN enables efficient network management by programming network operations. This has the advantage that network administrators can flexibly respond to various types of attacks. In this paper, we design a threat level management module, an attack detection module, a packet statistics module, and a flow rule generator that collects attack information through the controller and switch, which are components of SDN, and detects attacks based on these attributes of SDN. It proposes a method to block denial of service attacks (DoS) of advanced attackers by programming and applying honeypot. In the proposed system, the attack packet can be quickly delivered to the honeypot according to the modifiable flow rule, and the honeypot that received the attack packets analyzed the intelligent attack pattern based on this. According to the analysis results, the attack detection module and the threat level management module are adjusted to respond to intelligent attacks. The performance and feasibility of the proposed system was shown by actually implementing the proposed system, performing intelligent attacks with various attack patterns and attack levels, and checking the attack detection rate compared to the existing system.
HYERS-ULAM STABILITY OF DERIVATIONS IN FUZZY BANACH SPACE: REVISITED
Gang Lu,Yuanfeng Jin,Gang Wu,Sungsik Yun 한국수학교육학회 2018 純粹 및 應用數學 Vol.25 No.2
Lu et al. [27] dened derivations on fuzzy Banach spaces and fuzzy Lie Banach spaces and proved the Hyers-Ulam stability of derivations on fuzzy Banach spaces and fuzzy Lie Banach spaces. It is easy to show that the denitions of derivations on fuzzy Banach spaces and fuzzy Lie Banach spaces are wrong and so the results of [27] are wrong. Moreover, there are a lot of seroius problems in the statements and the proofs of the results in Sections 2 and 3. In this paper, we correct the denitions of biderivations on fuzzy Banach algebras and fuzzy Lie Banach algebras and the statements of the results in [27], and prove the corrected theorems.
( Won Jai Lee ),( Ji Hun Park ),( Sungsik Shin ),( Jung U Shin ),( Hyun No ),( Dae Hyun Lew ),( Woo Ick Yang ),( Chae Ok Yun ),( Kwang Hoon Lee ),( Ju Hee Lee ) 대한피부과학회 2014 대한피부과학회 학술발표대회집 Vol.66 No.2
Background: Endothelial-to-mesenchymal transition (EndoMT) is a phenotypic conversion characterized by the down- regulation of vascular endothelial markers and acquisition of a mesenchymal phenotype. Objectives: We hypothesize that keloid fibroblasts may be of endothelial origin and that EndoMT contributes substantially to the collagen accumulation during the development and progression of keloids. Methods: Wnt-3a protein expression was examined by immunohistochemistry in keloid tissues. HDMECs were treated with Wnt-3a. mRNA and protein expression of endothelial and mesenchymal cell markers was measured with real-time reverse transcriptase-polymerase chain reaction and immunocytochemistry. Also, co-expression of cluster of differentiation 31 and vimentin in the vascular endothelium of keloid tissues was examined with immunofluorescence. Results: Overexpression of Wnt-3a was noted in human keloid tissues. Wnt-3a treatment significantly reduced VE-cadherin mRNA expression and induced vimentin and slug mRNA expression in HDMECs. HDMECs became spindle-shaped and exhibited reduced expression of CD31 and increased expression of vimentin, slug, and α-SMA. Also, co-expression of CD31 and vimentin was observed in the dermal vascular endothelium of keloid tissues from two patients with clinically active keloids patients (n=7). Conclusion: Transient conversion of HDMECs to a mesenchymal phenotype may contribute substantially to dermal fibrosis of the keloid and hypertrophic scars
혈청 아디포넥틴 측정 키트(AdipoMark)의 개발과 심혈관질환 위험요인과의 관련성 연구
지선하(Sun Ha Jee),이승복(Seungbok Lee),민성식(Sungsik Min),박정용(Jungyong Park),김현숙(Hyon-Suk Kim),김상연(Sang Yeun Kim),윤지은(Ji Eun Yun),이선주(Sun Ju Lee),지은정(Eun Jung Jee),이희연(Hee Yeon Lee),송혜윤(Hye Yun Song) 한국역학회 2007 Epidemiology and Health Vol.29 No.2
Purposes: To develop a rapid, sensitive, qualitative ELISA-kit for serum adiponectin and examine correlation with adiponectin and cardiovascular risk factors. Methods: On the base of monoclonal antibodies against adiponectin, apply indirect ELISA to study the performance parameter of the kit. The correlation was examined between adiponectin and cardiovascular risk factors including waist circumference, body mass index, triglyceride, and HDL cholesterol. Results: The limited concentration of detection of the ELISA-kit was 1㎍/㎖. Linearity with R&D system and AdipoGen with this ELISA-kit was acceptable: the linear equation with R&D system was y=1.0116x+0.4629 (R2=0.97) and linear equation with AdipoGen was y=0.9562x+1.1961 (R2=0.93), respectively. The average recovery rate of the ELISA-kit ranged 92 to 104%. The correlation coefficient of waist circumference with adiponectin was -0.2276 (p<0.0001) among men and -0.2328 (p<0.0001) among women. Conclusion: This ELISA-kit was quick, sensitive, and stable and can be used to determine adiponectin in serum.