• Annual Conference of KIPS
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• 2012.11a
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• pp.262-263
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• 2012

하나의 클라우드 서비스 제공자가 제공하는 컴퓨팅 자원의 양과 종류에는 한계가 있다. 이를 극복하려면 클라우드 협업 기술인, 다중 클라우드 자원 브로커를 활용하여, 이종 자원을 탐색하여 사용자에게 제공하는 기술이 필요하다. 본 논문에서는 다중 클라우드 자원 브로커 시스템의 구조를 제안하고, 이종 자원 탐색에 필요한 성능 지표와 LP 모델을 이용한 최적화 기법을 제안하고자 한다.

• Journal of Broadcast Engineering
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• v.20 no.2
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• pp.248-256
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• 2015

In this paper, we model the interference plus noise signal for terrestrial cloud transmission systems and present bit error rate (BER) performances. Since terrestrial cloud transmission systems experience co-channel interference from one or more transmitters, they have to operate under a negative signal-to-interference plus noise ratio (SINR) region. The interference plus noise signal can be modeled as Gaussian random variable under the required SINR region and we observe the BER performance of the cloud transmission system using the derived model. Also, we propose an improved channel estimation scheme by averaging the channel estimates based on least square based interpolation scheme. Simulation results show that the cloud transmission system can operate under negative SINR region using the proposed channel estimation scheme.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.1
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• pp.101-108
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• 2021

This paper builds a real-time home security system based on the OneNet cloud platform to control the status of the house through a smartphone. The system consists of a local part and a cloud part. The local part has I/O devices, router and Raspberry Pi (RPi) that collects and monitors sensor data and sends the data to the cloud, and the Flask web server is implemented on a Rasberry Pi. When a user is at home, the user can access the Flask web server to obtain the data directly. The cloud part is OneNet in China Mobile, which provides remote access service. The hybrid App is designed to provide the interaction between users and the home security system in the smartphone, and the EDP and RTSP protocol is implemented to transmit data and video stream. Experimental results show that users can receive sensor data and warning text message through the smartphone and monitor, and control home status through OneNet cloud.

• International Area Studies Review
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• v.21 no.1
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• pp.97-117
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• 2017

This research highlights the process of adopting cloud computing technology from users' perspective. Concentrating on perceived mechanism from employees side that lead to job performance at work. Cloud computing, the new player in our modern business environment, authors employ diffusion of innovation theory to capture how this new technology affect employees in workplace in terms of job performance. Education for this new system and managerial support by firm were used as moderating variable to test dependent variable, job performance. Research was done through survey from total 284 people working in metropolitan area at South Korea. The result shows that cloud computing system affect positively on work efficiency, and the extent of diffusion factors that influence from the most to least are as follow: 1. Users' Skill, 2. System Quality, 3. Information Quality, 4. Group Awareness, 5. Attitude towards New System. To test diffusion factors of cloud computing and job performance, South Korean people actually felt that cloud computing help their job performance and the extent of diffusion factors that influence from the most to least are as follow: 1. Users' Skill, 2. System Quality, 3. Information Quality, 4. Attitude towards New System, 5. Group Awareness. As for diffusion factors of cloud computing and productivity, result proved that cloud computing really helps firms, and the extent of diffusion factors that influence from the most to least are as follow: 1. Information Quality, 2. Attitude towards New System, 3. Group Awareness, 4. System Quality, 5. Users' Skill. Two moderating variables, employee education and managerial support were tested to prove whether these two variables affect the job performance and the result displays positive affect for both two factors. To conclude, adopting cloud computing helps firms by increase employees' work efficiency and job performance. In order to accelerate the process employees education really matters because users' skill is the most crucial among diffusion factors.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.47 no.6
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• pp.19-27
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• 2010

Many security issues occur in cloud computing service environment such as authentication, access control, and so on. In this paper, we propose an effective authentication and access control model which provide integrated management and control when we access various resources in cloud computing environment. To address these problems, we suggest a context-aware single sign-on and access control system using context-awareness, integrated authentication, access control, and OSGi service platform in cloud computing environment. And we show design and implementation of context-aware single sign-on and access control system. Also we verified the flexibility and convenience of the proposed system through multi fact based integrated authentication in cloud computing environment. We could provide flexible and secure seamless security service by user context in cloud computing environment.

• Journal of the Korean Institute of Intelligent Systems
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• v.24 no.3
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• pp.239-244
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• 2014

As the usefulness of mobile device is kept growing the privacy of the cloud computing is receiving more attentions. Even though many researches and solutions for privacy matters are suggested we are still worrying about the security problems. In addition most of cloud computing systems uses file-level synchronization which make it difficult to modify a part of a file. If we use data-centric app that stores data on embedded DBMS such as SQLite, a simple synchronization may incur some loss of information. In this paper we propose a solution to build a personal cloud that supports record-level synchronization. And we show a prototype system which uses RESTful web services and the same schema on mobie devices and the cloud storage. Synchronization is achieved by using a kind of optimistic concurrency control.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.678-680
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• 2013

Recently, A computing environment are provided that can easily be used for services based on the cloud environment. Among them, SaaS(SoftWare as a Service) is that it provides cloud users to be available by placing the cloud systems on the Internet software. But, the problem with this, problems is that user can not be utilized to not find a service registered in the cloud system. The thing to make clear the meaning and relationship between services using the ontology to solve these problems, It must be supported to be used to find the exact service the user wants. Ontology for service discovery can be used to help to find services by guessing relevance by using the function or service names entered by the user. We provide how to configure the service ontology and the search system of services using ontology.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.4
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• pp.121-126
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• 2023

As service utilization for IT technologies such as artificial intelligence, big data, and IOT has recently increased, cloud computing has been introduced to efficiently manage vast amounts of data and IT infrastructure resources that process them to provide stable and reliable information services while streamlining infrastructure costs. Efforts for this are ongoing. This thesis compares and analyzes the operation results before and after cloud adoption in terms of system failures for 426 systems at 360 branches nationwide in cloud systems of companies operating a total of 1,750 cloud systems. As a result of the analysis, the number of failures and failure types , service downtime, etc., the introduction of the cloud yielded significant results in securing service continuity. Through this result, it is expected to provide meaningful implications to companies expecting to secure service continuity by adopting the cloud.

• Annual Conference of KIPS
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• 2014.11a
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• pp.699-702
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• 2014

본 논문은 스프링 프레임 워크를 이용한 클라우드 환경에서의 자산 및 부실예측 지원시스템을 제안한다. 제안된 시스템은 자동화된 통합인증 및 접근제어 시스템으로서 각기 독립된 모듈에서 처리된 데이터를 기초로 거래관리 모듈로 통합하여 자산 및 부실예측을 평가하고 지원시스템의 데이터의 기법을 다른 모듈과 공유함으로써 자산의 부실채권을 이용한 회수를 관리하여 효율성을 높인다. 또한 제안 시스템은 클라우드 환경에서 운영되므로 정보화를 통한 경영혁신 및 경영정보를 활용한 리스크 관리 시스템을 처리하는데 목적을 둔다. 따라서 제안하는 시스템은 고객과 기업의 전략경영 등의 기능을 강화하여 업무투명성, 비용절감, 고객 접근성이 기존시스템보다 효율적으로 사용될 것으로 기대된다.

• Annual Conference of KIPS
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• 2013.05a
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• pp.846-849
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• 2013

본 논문은 클라우드 기반 자산 및 부실예측관리 통합 지원 시스템을 제안한다. 제안된 시스템은 자동화된 통합인증 및 접근제어 시스템으로서, 각기 독립된 모듈에서 처리된 데이터를 기초로 거래관리 모듈로 통합하여, 자산 및 부실예측을 평가하고 통합지원 시스템의 데이터 및 기법을 다른 모듈과 공유함으로써 자산 및 부실채권 회수 및 관리의 효율성을 높인다. 또한 제안 시스템은 클라우드 환경에서 운영되므로 정보화를 통한 경영혁신 및 경영정보를 활용한 리스크관리 시스템을 처리하는데 목적을 둔다. 따라서 제안하는 시스템은 고객 및 기업의 전략경영 등의 기능을 강화하여 업무투명성, 비용절감, 고객 접근성이 기존시스템보다 효율적으로 사용될 것으로 기대된다.