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이영교,원동호,이영숙 한국콘텐츠학회 2005 한국콘텐츠학회논문지 Vol.5 No.1
With the rapid progress of research to offer a convenience of mobile communication, the mobile users can use not only the services of voice call but also the variety services of data communication using Internet. These include Internet Searching, Internet Shopping and Internet banking and Internet stock exchange and electronic payment and so on, based on PKI. Also, the need of data communication between the mobile users has been increased. As it is possible for mobile users to do user authentication, key distribution, encryption, decryption and so on, it is needed the certificate status validation between the mobile users. However due to the PCS(Personal Communication System) had been only designed and implemented for voice call between the mobile users, it is not easy to apply data communication between the mobile users on PKI. Therefore the study of for the data communication between the mobile users in PCS is a few. It is for the data transfer between the mobile users to communicate using call processing of PCS. So, we propose how to process the certificate status validation during call processing for data communication between the mobile users in the PCS. 이동통신 사용자들은 PKI를 기반으로 무선 인터넷을 통한 뱅킹, 증권거래, 전자 지불 등의 다양한 서비스를 이용하고 있다. 또한 이동통신 사용자간의 데이터 통신에 대한 필요성도 점차 증가하고 있다. 무선 PKI 환경에서 사용자들은 인증서를 이용하여 사용자 인증, 키 분배, 암복호화 등을 수행할 수 있으며 그에 따라 이동통신 사용자간의 인증서상태 검증과정도 필요하게 되었다. 이미 개발되어 상용화되어 있는 이동통신용 교환기는 음성 통화를 위주로 설계되었으므로 이를 이용하여 데이터 통신을 하기 위해서는 음성호의 호처리 절차를 이용하여야 한다. 따라서 본 연구에서는 무선 PKI 환경을 이용한 이동통신 사용자간의 데이터 통신에 필요한 인증서상태 검증작업을 호처리 과정 내에서 효율적으로 처리할 수 있는 모델을 PCS(Personal Communication System)를 중심으로 제안하고자 한다.
클라이언트와 서버의 연산시간을 줄여주는 실시간 인증서 상태 검증에 관한 연구
이영교,원동호,이영숙,조석향 한국콘텐츠학회 2005 한국콘텐츠학회논문지 Vol.5 No.2
As a research on PKI is being very popular, the study relating to certificate status validation is being grown with aim to reduce an overhead of the protocol and to provide an efficient operation. The OCSP of the standard protocol related to the study enables applications to determine the revocation state of an identified certificate. However, the OCSP server can not service millions of certificate status validation requests from clients in a second on E-commerce because of the computational time for signature and verification. So, we propose the Real-time Certificate Status Validation Protocol(RCSVP) that has smaller computational time than OCSP. RCSVP server reduce the computational time of certificate status validation using hash function and common secret value. Also RCSVP client does not need the computational time of certificate verification to acquire the public key from an identified certificate. Therefore, the proposed protocol enables server to response millions of certificate status validation requests from clients in a second on E-commerce. OCSP는 서버가 클라이언트에게 request와 response를 이용하여 실시간 인증서 상태 검증을 제공해주는 온라인 프로토콜이다. 서버와 클라이언트 사이에 전송되어지는 request와 response는 사용자 인증과 데이터의 무결성을 위하여 보내는 측에서 전자서명이 되고 수신측에서 서명검증이 된다. E-commerce 상에서 서버는 초당 수백만 개의 클라이언트들의 인증서 상태검증 요구를 처리해야 하는데 OCSP 서버는 전자서명과 서명검증을 위한 연산 시간으로 이 조건을 만족할 수 없다. 따라서 본 논문에서는 클라이언트-서버 환경에서 서버의 연산 시간을 줄여 수백만 개의 인증서 상태 검증 요청을 처리할 수 있는 방법을 제안하고자 한다. 이 방법은 또한 클라이언트에서의 연산 시간도 줄여준다.
이영교,안경림 한국컴퓨터산업학회 2001 컴퓨터産業敎育學會論文誌 Vol.2 No.9
Security is very important at EC(Electronic Commerce) Environments. The reason is that exchanged data(that is user private information(accounts, card-no, password), transaction items, etc) is various and is very sensitive. In this paper, we propose the Secure-XML Messaging System(S-XMS) which is implemented to support Message Level Security, Encryption and Digital Signature. And we implement Message Confidentiality Service, User Authentication & Message Integrity Service and Non-Repudiation Service among the various Security Services.
패킷화된 음성과 저속의 데이터가 혼합된 트래픽을 위한 Layered Cell 프로토콜의 성능해석
이영교,박기식,정해원,조성준 한국통신학회 1999 한국통신학회논문지 Vol.24 No.7
In this paper, we proposed a simulation model to which apply the AAL 2 (AAL type 2) between BSC and MSC in the cellular mobile communication systems. We suggested the frame structure of processing the packets of short length and the scheme which multiplex to one or more ATM cell. Also, we analyzed the performance of the APR, transmission delay, and channel transmission efficiency used in the packetized voice traffic and the low bit-rate data traffic such as fax. From the simulation results, the maximum number of users are 47 users without using AAL 2 multiplexing, but the maximum number of users are 70 (Non-Overlapping scheme) users, 110 (Overlapping scheme) users, respectively. Thus, we knew that the Overlapping scheme is more efficient than the Non-Overlapping scheme. Finally, we showed that the optimum transmission buffer size is 4 ATM cells in the cellular communication systems with the bandwidth of 2 Mbps.
취업준비생과 채용기업을 위한 양방향 검색 시스템에 관한 연구
이영교 국제차세대융합기술학회 2022 차세대융합기술학회논문지 Vol.6 No.10
As having rapidly developed Internet based IT technologies, various applications using IT technologies also have been improved and lots of benefits could be expected as a result. However, even in an IT environment, redundant work still exists for companies that want to hire talented people and for applicants who want to work in the companies they want. For example, the job seeker is busy finding job postings on multiple recruitment portal websites, filling out resumes and self-introductions to apply, and companies looking to hire people are also busy posting job postings on multiple recruitment portals. The job seeker and recruiting companies waste costs and time to find and post job openings, but both fail to achieve satisfactory results. However, websites such as Worknet allow the job seeker to search in detail of companies that want to hire, and in some sites, companies can search for the job seeker when he/she is uploading their resumes. Therefore, this paper proposes an interactive searching system between the job seeker and recruiting companies, which allows the job seeker to search for the recruiting company that they want in detail, and allows the recruiting company to search for the job seeker in detail. 인터넷을 기반으로 하는 IT가 발전하면서 많은 분야가 빠르게 발전하고 있으며 우리는 그 혜택을 누리고 있다. 그러나 아직까지도 인재를 채용하려는 회사와 원하는 기업에 취업하려는 지원자는 힘들기만 하다. 지원자는 채용 정보를 여러 채용 포털 웹 사이트에서 찾아 이력서와 자기소개를 작성하여 지원하기에 바쁘고 인재를 채용 하려는 기업은 채용공고를 여러 채용 포털에 올리느라 바쁘다. 지원자와 채용 기업은 비용과 시간을 낭비하면서 채용정보를 찾고 채용정보를 올리지만 각기 만족스런 결과를 얻지 못한다. 그나마 워크넷과 같은 웹 사이트는 채 용을 원하는 기업을 지원자가 상세히 검색할 수 있도록 되어 있고 일부 사이트는 지원자가 이력서를 업로드시키 면 기업에서 지원자를 검색하는 상황이다. 따라서 본 논문에서는 지원자가 원하는 채용 회사를 상세히 검색할 수 있고 반대로 인재를 채용하려는 회사에서도 지원자를 상세히 검색할 수 있는 지원자와 채용 기업의 양방향 검색 시스템을 제안한다.
이영교,이영숙 한국콘텐츠학회 2002 한국콘텐츠학회논문지 Vol.2 No.4
This paper proposes the cell scheduling algorithm proper to high-speed ATM switch. The proposed algorithm is the VRR(Variable weight Round Robin) combined the FRR to variant QLT. The FRR performs the cell service of the fixed weight by each buffer. So, FRR don't support the QoS of ATM service classes although it is easy to implement a high speed switch. VRR uses the method expaned to variable weight according to buffer state as well as schedules the cell according the Fixed weight based FRR. The simulation to evaluate the proposed algorithm was done by AweSim arid Visual C++. The result graphs show that the proposed algorithm is excellent, especially in the aspect of cell loss. This area is engaged by English Abstract.
이영교,안정희,Lee, Younggyo,Ahn, Jeonghee 디지털산업정보학회 2015 디지털산업정보학회논문지 Vol.11 No.2
The almost of Web page has been gathered the personal information(Korean resident registration number, name, cell-phone number, home telephone number, E-mail address, home address, etc.) using the membership and log-in. The all most user of Web page are concerned for gathering of the personal information. I-pin is the alternative means of resident registration number and has been used during the last ten-year period in the internet. The accident of I-pin mass illegal issue was happened by hacker at February, 2015. In this paper, we analysis the problems of I-pin system about I-pin mass illegal issue accident and propose a improvement method of it. First, I-pin issue must be processed by the off-line of face certification in spite of user's inconvenience. Second, I-pin use must be made up through second certification of password or OTP. The third, the notification of I-pin use must be sent to the user by the text messaging service of cell-phone or the E-mail. The forth, I-pin must be used an alternative means of Korean resident registration number in Internet. The methods can reduce the problems of I-pin system.
이영교,안정희 한국컴퓨터산업학회 2002 컴퓨터産業敎育學會論文誌 Vol.3 No.1
This paper propose the queue structure of cell buffering in the output buffer of ATM switch for the traffic with the different QoS. The proposed queue structure can minimize the cell loss ratio of bursty traffic, maximize the queue utilization through the sharing of real-time queue and non-real-time queue. To evaluate the proposed queue structure, we compare the CLP and cell average delay of the proposed queue and fixed queue using the bursty traffic patterns.