• KSII Transactions on Internet and Information Systems (TIIS)
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• 제4권6호
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• pp.1237-1252
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• 2010

This paper proposes an intelligent technique for data sharing and event transition among personal devices including smart phones, laptops, and desktops. We implemented the PES (Personal Event Service) system that proactively executes appropriate tasks across multiple devices without explicit user requests by sharing the data used by the user and recognizing user intention based on the observed actions of the user for specific devices. The client module of PES installed on each device monitors the user actions and recognizes the intention of the user. The server provides data sharing and maintenance for clients. The connection between client and server is established by Java RMI (Remote Method Invocation). A series of experiments were performed to evaluate user satisfaction and system accuracy, and the results showed that the PES system can proactively provide appropriate, personalized services with a high degree of satisfaction to the user in an effective and efficient manner.

• International journal of advanced smart convergence
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• 제10권2호
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• pp.64-72
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• 2021

XML message brokers have a lot of importance because XML has become a practical standard for data exchange in many applications. Message brokers covered in this document store many users. This paper is a study of the processing of twig pattern queries in XML documents using branching node streams in XML message broker structures. This work is about query processing in XML documents, especially for query processing with XML twig patterns in the XML message broker structure and proposed a method to reduce query processing time when parsing documents with XML twig patterns by processing information. In this paper, the twig pattern query processing method of documents using the branching node stream removes the twigging value of the branch node that does not include the labeling value of the branch node stream when it receives a twig query from the client. In this paper, the leaf node discovery time can be reduced by reducing the navigation time of nodes in XML documents that are matched to leaf nodes in twig queries for client twig queries. Overall, the overall processing time to respond to queries is reduced, allowing for rapid question-answer processing.

• 정보보호학회논문지
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• 제6권4호
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• pp.53-66
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• 1996

World Wide Web is a total solution for multi-media data transmission on Internet. Because of its characteristics like ease of use, support for multi-media data and smart graphic user interface, WWW has extended to cover all kinds of applications. The Secure Information Center(SIC) is a data transmission system using conventional cryptography between client and server on WWW. It's main function is to support the encryption of sending data. For encryption of data IDEA(International Data Encryption Algorithm) is used and for authentication mechanism MD5 hash function is used. Since Secure Information Center is used by many users, conventional cryptosystem is efficient in managing their secure interactions. However, there are some restrictions on sharing of same key and data transmission between client and server, for example the risk of key exposure and the difficulty of key sharing mechanisms. To solve these problems, the Secure Information Center provides encryption mechanisms and key management policies.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2011년도 춘계학술발표대회
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• pp.160-162
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• 2011

본 논문에서는 Zigbee 통신을 이용하여 대기전력을 차단함 함으로써 전력 소비를 줄이기 위한 스마트 오피스 시스템의 설계 및 구현에 관하여 기술한다. 구현된 시스템은 Server를 통하여 각 Client의 전류에 대한 통제를 가능하게 하며, 전력 사용 상황과 전력량 정보를 통해 사용자에게 고지함으로써 기존의 전자기기의 대기전력의 소비를 줄일 수 있다. 또한 외부 장치에서 Server로의 접근을 통해 제어할 수 있도록 하여 공간적인 문제도 고려하였다. 실험 결과를 통해 시스템을 이용함으로써 대기전력 소비가 종전보다 작아짐을 확인 할 수 있었다. Server는 ARM과 C#, Client는 ATmega와 C를 이용하여 구현하였다.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제2권6호
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• pp.245-252
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• 2013

본 연구는 스마트러닝을 위한 실시간 평가학습과 상호작용을 통한 피드백을 지원하는 시스템을 개발하고자 한다. 개발된 평가학습 시스템은 태블릿 PC용 어플리케이션과 스마트폰용 앱 그리고 서버로 구성되어 있으며 클라이언트는 서버와 무선통신을 이용해 데이터를 주고받는다. 본 시스템은 평가를 통한 학습자와 교수자간, 학습자와 학습자들 간에 실시간 상호작용과 피드백을 가능하게 하였다. 이러한 방법을 적용함으로서 학습자의 수준별 지도가 가능하며 학습자의 학업성취도와 학습 흥미도를 높이고자 한다.

• 한국정보통신학회논문지
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• 제16권11호
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• pp.2424-2430
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• 2012

기존의 개발된 시각 장애인을 위한 길 안내 서비스를 위한 보조기구는 지팡이에 장착된 RFID 태그를 이용, 표지블록과 RF통신을 하는 정도의 간단한 보행 안내 서비스였습니다. 이는 RFID의 리더기의 인식거리가 짧고, 명확한 장애물의 위치, 크기 및 형태를 판단 할 수 없다. 이에 위험 사항이나 길안내 중 경로 이탈 발생 시 대책방안이 시급히 필요하다. 오늘 날 스마트 디바이스 개발로 인해 사용자들에게 다양한 혜택과 편리성을 제공 하고 있다. 이에 안드로이드 플랫폼 Client 와 Server(PC)간의 소켓 스트림을 이용, 실시간 영상정보와 음성, 위치정보를 전송하여 시각장애인의 위험 상황에 즉각적인 조치를 취할 수 있는 시스템 및 1:N 서비스를 구현하고자 한다.

• 디지털산업정보학회논문지
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• 제10권1호
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• pp.81-87
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• 2014

Password-based authentication using smart card provides two factor authentications, namely a successful login requires the client to have a valid smart card and a correct password. While it provides stronger security guarantees than only password authentication, it could also fail if both authentication factors are compromised ((1) the user's smart card was stolen and (2) the user's password was exposed). In this case, there is no way to prevent the adversary from impersonating the user. Now, the new technology of biometrics is becoming a popular method for designing a more secure authentication scheme. In terms of physiological and behavior human characteristics, biometric information is used as a form of authentication factor. Biometric information, such as fingerprints, faces, voice, irises, hand geometry, and palmprints can be used to verify their identities. In this article, we review the biometric-based authentication scheme by Cheng et al. and provide a security analysis on the scheme. Our analysis shows that Cheng et al.'s scheme does not guarantee any kind of authentication, either server-to-user authentication or user-to-server authentication. The contribution of the current work is to demonstrate these by mounting two attacks, a server impersonation attack and a user impersonation attack, on Cheng et al.'s scheme. In addition, we propose the enhanced authentication scheme that eliminates the security vulnerabilities of Cheng et al.'s scheme.

• International Journal of Internet, Broadcasting and Communication
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• 제13권4호
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• pp.121-128
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• 2021

In order to design a real time big data collection and analysis system of manufacturing data in a smart factory, it is important to establish an appropriate wired/wireless communication system and protocol. This paper introduces the latest communication protocol, OPC-UA (Open Platform Communication Unified Architecture) based client/server function, applied user interface technology to configure a network for real-time data collection through IoT Integration. Then, Database is designed in MES (Manufacturing Execution System) based on the analysis table that reflects the user's requirements among the data extracted from the new cutting process automation process, bush inner diameter indentation measurement system and tool monitoring/inspection system. In summary, big data analysis system introduced in this paper performs SPC (statistical Process Control) analysis and visualization analysis with interface of OPC-UA-based wired/wireless communication. Through AI learning modeling with XGBoost (eXtream Gradient Boosting) and LR (Linear Regression) algorithm, quality and visualization analysis is carried out the storage and connection to the cloud.

• International Journal of Internet, Broadcasting and Communication
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• 제13권3호
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• pp.148-154
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• 2021

We propose the AI Smart Factory Model for integrated management of production processes in this paper .It is an integrated platform system for the production of food packaging containers, consisting of a platform system for the main producer, one or more production partner platform systems, and one or more raw material partner platform systems while each subsystem of the three systems consists of an integrated storage server platform that can be expanded infinitely with flexible systems that can extend client PCs and main servers according to size and integrated management of overall raw materials and production-related information. The hardware collects production site information in real time by using various equipment such as PLCs, on-site PCs, barcode printers, and wireless APs at the production site. MES and e-SCM data are stored in the cloud database server to ensure security and high availability of data, and accumulated as big data. It was built based on the project focused on dissemination and diffusion of the smart factory construction, advancement, and easy maintenance system promoted by the Ministry of SMEs and Startups to enhance the competitiveness of small and medium-sized enterprises (SMEs) manufacturing sites while we plan to propose this model in the paper to state funding projects for SMEs.

• 한국컴퓨터그래픽스학회논문지
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• 제21권3호
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• pp.17-26
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• 2015

본 연구는 클라이언트 서버 기반의 볼륨 가시화 시스템에 대해 설명한다. 소형 병원에서의 볼륨 가시화 시스템은 소수의 사용자만이 동시에 사용한다는 점에 착안하여, 단일 GPU를 장착한 PC를 렌더링 서버로 사용하고 클라이언트는 현재 대중적으로 사용하는 스마트 폰과 같은 안드로이드 기반의 모바일 장비를 사용하였다. 사용자가 클라이언트 응용 프로그램을 이용하여 렌더링 요청을 하면, 서버는 GPU를 사용하여 볼륨 가시화를 수행한다. 렌더링 영상은 서버에서 JPEG나 PNG 형식으로 압축하는데, 네트워크 전송량을 감소시켜 가시화 속도를 향상시킬 수 있다. 추가적으로 사용자가 터치 스크린을 드래그 하는 경우 반응시간을 향상하기 위해, 사용자가 발생하는 일부의 이벤트를 제거하며 서버는 제거된 이벤트를 보간을 통해 보상하는 방법을 제안한다. 그 결과로 제안 시스템은 5명의 동시 사용자에 대해 GPU를 장착한 단일 상용 하드웨어로 실시간 볼륨 가시화가 가능하였다.