• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2015년도 추계학술발표대회
• /
• pp.767-770
• /
• 2015

With the deployment of web-based educational game over the internet, the user's registration becomes a critical element. The user is authenticated by the system using username, password, and unique code. However, it cannot be handled properly because the data is transmitted through insecure channel on the network. Hence, security requirement is needed to avoid identity leakage from malicious user. In this paper, we propose a secure communication approach using SSL protocol for an online game. We also describe the security requirements for our approach. In future work, we intend to configure and implement the SSL protocol by enabling HTTPS in web-based online game.

• 한국통신학회논문지
• /
• 제18권12호
• /
• pp.1945-1955
• /
• 1993

본 논문은 개인통신서비스(PCS)의 운영에 있어 필수적인 요소로 부상하고 있는 개인식별 기능을 갖는 두가지 키분배 방식을 제안하였다. PCS를 위한 서비스절차와 안정성 요구분석을 수행하고, 기존에 제안된 디지털 이동통신을 위한 키분배방식의 안전성을 검토하였따. 특히 기존 방식중 Park 등이 제안한 ElGamal변형방식이 이용자 인증과정에 있어서 능동적 공격자에 대해 취약함을 입증하였다. 본 제안방식 I,II 는 Rabin 과 ElGamal 암호계를 변형, 혼합한 것으로, PCS 운영에 있어서 빈번히 요구되는 인증시 계산량을 감소시켰고 이용자의 제한된 계산능력을 고려하여 이용자의 계산량을 줄였으며, PCS 안전성 요구사항을 만족시킨 것이다. 타 방식과 비교분석한 결과, 안전성 및 효율성 특히 이용자의 계산량에 있어서 제안방식이 더 개선되었음을 확인하였다.

• 한국컴퓨터정보학회논문지
• /
• 제9권4호
• /
• pp.61-69
• /
• 2004

인간과 컴퓨터 사이의 복잡한 상호작용을 지원하기 위해서는 사용자 인터페이스의 설계가 중요하다. 고객의 요구사항을 수집하고 설계하기 위하여 매우 포괄적인 다방면의 지식이 요구된다. 사용자 인터페이스 설계자는 그래픽 전문가, 요구사항 분석가, 시스템 설계자, 프로그래머, 기술 전문가, 사회 행동과학자, 그리고 업무분야에 따라서 그 분야의 전문가를 필요로 한다. 따라서 다방면의 전문성을 만족시킬 수 있는 사용자 인터페이스를 설계하기 위하여 더 많은 연구가 요구되고 있다. 본 논문에서는 필드 추상화 객체, 태스크 추상화 객체, 트랜잭션 추상화 객체, 폼 추상화 객체 등의 4단계의 가시화 기법을 제안한다. 이 모델링 단계는 사용자 인터페이스에서 가시적 응집도를 향상시켜주고, 초보 설계자도 양질의 사용자 인터페이스를 개발할 수 있도록 지원한다.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제13권3호
• /
• pp.1311-1324
• /
• 2019

In the traditional cellular network communication, the cellular user and the base station exchange information through the uplink channel and downlink channel. Meanwhile, device-to-device (D2D) users access the cellular network by reusing the channel resources of the cellular users. However, when cellular user channel conditions are poor, not only D2D user cannot reuse its channel resources to access the network, but also cellular user's communication needs cannot be met. To solve this problem, we introduced a novelty D2D communication mechanism in the downlink, which D2D transmitter users as half-duplex (HD) relays to assist the downlink transmission of cellular users with reusing corresponding spectrum. The optimization goal of the system is to make the cellular users in the bad channel state meet the minimum transmission rate requirement and at the same time maximize the throughput of the D2D users. In addition, i for the purpose of improving the efficiency of relay transmission, we use two-antenna architecture of D2D relay to enable receive and transmit signals at the same time. Then we optimized power of base station and D2D relay separately with consideration of backhaul interference caused by two-antenna architectures. The simulation results show that the proposed HD relay strategyis superior to existing HD and full-duplex (FD) models in the aspects of system throughput and power efficiency.

• 한국항해항만학회지
• /
• 제40권3호
• /
• pp.89-95
• /
• 2016

S-Mode는 항해설비에 있어 표준화된 디스플레이, 기능 및 공통인터페이스를 사용자에게 제공하여 항해기능 사용의 친숙화를 도모함으로써 항해안전성 향상을 위한 기능이다. 2008년 국제해사기구에서 국제선장협회는 S-Mode 도입의 필요성을 제기하였고, 2015년 6월 해사안전위원회에서 승인된 e-Navigation 전략이행계획에 주요과제로서 S-Mode 가이드라인 개발을 2019년까지 완료할 것을 목표로 하고 있다. 본 연구는 S-Mode 가이드라인 개발에 대한 사용자의 기대와 요구사항을 조사하기 위해서 핵심 항해설비인 전자해도시스템의 주 사용자인 항해사를 대상으로 S-Mode의 필요성과 표준화의 범위, 개발에 고려하여야 할 우선순위 요소에 대한 설문조사를 실시하고 그 내용을 분석하였다. 연구의 결과는 e-Navigation 이행 시 선박 항해설비 전반에 적용될 S-Mode 개념 및 기능에 대한 개념을 구체화하고, 개발에 고려할 세부요소들을 제시함으로써 구체적인 표준화 항목을 도출하는 것에 기여할 수 있을 것으로 기대된다.

• 디지털산업정보학회논문지
• /
• 제12권3호
• /
• pp.11-24
• /
• 2016

The purpose of this study is to develop a recruiting platform resolving the mismatch between corporate job and job finder's competence in recruitment market. For this, we investigated technological trends and limitation on recruit platform. Based on the findings, this study investigates the trends and directions related to recruiting platform evolution and identified critical success factors and development strategies for successful development of recruiting platform. Two development strategies include employment of online resume and construction of database assessing job finder's competence. We also proposed target system architecture incorporating job database, competency assessment form, capability oriented resume. To analyze user requirement national competency standards and core job capability evaluation model were analyzed. Next, we designed integrated database, user interfaces, and dynamic functionalities using the forms developed in earlier stage. Finally, we assessed the fidelity of form item, integrity of database, and the usability of interface to evaluate the effectiveness of the system.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2004년도 춘계학술대회 논문집
• /
• pp.494-500
• /
• 2004

The purpose of this thesis is to know and understand the user requirements to provide with intelligent railway information service in response to the Ubiquitous environment. The railroad specially has a disadvantage of door-to-door service, however by using the information and communication techniques, we can provide the passengers who are using the intermodal transportation means with the realtime information, therefore we can overcome the above disadvantage. To deduce the passenger's needs for providing the future-type railway information service, we introduce the results of the questionnaire. In chapter 2, we studies on the concepts of intelligent railway information service, and in chapter 3, we investigate the cases of Japan and China, and in chapter 4, we study the passager's satisfaction by the questionnaire concerning the railway information service and suggest the needs for information offering.

• 제어로봇시스템학회논문지
• /
• 제18권11호
• /
• pp.1011-1017
• /
• 2012

Augmented Reality is being widely used not only for Smartphone users but also in industries such as maintenance, construction area. With smartphone, due to the low localization accuracy and the requirement of special infrastructure, current LBS (Localization Based Service) is limited to show P.O.I. (Point of Interest) nearby. Improvement of IMU (Inertial Measurement Unit) based deadreckoning is presented in this paper. Additional sensors such as the magnetic compass and magnetic flux sensors are used as well as the accelerometer and the gyro for getting more movement information. Based on the pedestrian movement, appropriate sensor information is selected and the complementary filter is used in order to enhance the accuracy of the localization. Additional sensors are used to measure the movements of the upper body and the head and to provide the user's line of sight.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제9권11호
• /
• pp.4331-4346
• /
• 2015

The femtocell network, which is designed for low power transmission and consists of consumer installed small base stations, coexists with macrocells to exploit spatial reuse gain. For its realization, cross-tier interference mitigation is an important issue. To solve this problem, we propose a joint access and power control scheme that requires limited information exchange between the femto and macro networks. Our objective is to maximize the network throughput while satisfying each user's quality of service (QoS) requirement. To accomplish this, we first introduce two distributed interference detection schemes, i.e., the femto base station and macro user equipment based schemes. Then, the proposed scheme dynamically adjusts the transmission power and makes a decision on the access mode of each femto base station. Through extensive simulations, we show that the proposed scheme outperforms earlier works in terms of the throughput and outage probability.

• 국제학술발표논문집
• /
• The 3th International Conference on Construction Engineering and Project Management
• /
• pp.1453-1462
• /
• 2009

It is very important for performance of information system that we make an effort to raise user's satisfaction by continuously grasping user's requirement by evaluation of PMIS based on ASP service quality and reflecting this to information system. However, It is lack that developments of suitable evaluation index of PMIS based on ASP service quality. Hereupon, In this study, we propose the evaluation indicators. First, The evaluation area is classified by form the foundation of D & M IS Success Model (2003); system quality, information quality, service quality. Second, The detail evaluation item which include considerations which are gotten through investigation of the construction industry and PMIS based on ASP is grouping by form the foundation SERVQUAL which is a service quality evaluation tool proposed PZB(1988). It is suitable to evaluate PMIS based on ASP service quality in construction industry and able to evaluate various aspects.