• 한국정보과학회논문지:정보통신
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• 제32권1호
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• pp.34-50
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• 2005

최근 운송 수단 등에 형성된 네트워크가 하나의 단위로 이동할 때 효율적으로 인터넷 접속을 지속할 수 있도록 하는 네트워크 이동성 지원 방안에 대한 연구가 이루어지고 있다 그런데, 지금까지 제안된 방안들은 이동 네트워크에 속하는 이동 노드의 수가 많아지는 경우 점차 핸드오프에 걸리는 시간이 증가하여 원활한 통신이 불가능하게 되거나, 이동 네트워크가 중첩된 상황에서 비효율적인 경로를 통한 전송을 초래하는 문제를 가지고 있다. 이에 본 논문은 이들 문제점을 해결할 수 있는 확장성 있는 네트워크 이동성 지원 방안인 SNEMOS(Scalable NEtwork Motility Support)를 제안하고 시뮬레이션에 의해 그 성능을 평가하였다. 시뮬레이션 결과 핸드오프 지연, 라우팅 경로 길이, 패킷 전달 지연, 데이타 패킷의 헤더 오버헤드 및 시그널링 오버헤드 둥의 측면에서 SNEMOS가 기존의 스킴들에 비해 우수한 성능을 보임을 알 수 있었다.

• 한국IT서비스학회지
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• 제11권2호
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• pp.339-353
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• 2012

Mobile communication technology is advancing forward to deliver more connected devices and richer content and applications. The number of subscriptions continues to grow along with an explosive increase in the mobile data traffic demand. Thereby, it creates a significant network capacity shortage concerns for mobile network operators. In order to address this problem, it is essential to increase the network capacity at a low additional cost. The device-to-device (D2D) communication based proximity service is believed to have a promising future mobile communication technology that is capable to create new mobile service opportunities and offload traffic to the eNB. In addition, it is also required to develop new mobile communication services and its business models not only to accommodate the increasing mobile traffic demand but also to foster profitability of mobile business service providers such as the network providers, contents providers and platform providers. In this article, we first analyze current mobile business eco-system in the context of CPNT based value chain. Then, propose service development framework and business model creation methodologies for the device-to-device communication based services in the beyond LTE/LTE-Advanced systems.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권5호
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• pp.1146-1165
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• 2013

Collaborative awareness between persons with various smart multimedia devices is a new trend in the Internet of Things (IoT). Because of the mobility, randomness, and complexity of persons, it is difficult to achieve complete data awareness and data transmission in IoT. Therefore, research must be conducted on mobile-aware service models. In this work, we first discuss and quantify the social relationships of mobile nodes from multiple perspectives based on a summary of social characteristics. We then define various decision factors (DFs). Next, we construct a directed and weighted community by analyzing the activity patterns of mobile nodes. Finally, a mobile-aware service routing algorithm (MSRA) is proposed to determine appropriate service nodes through a trusted chain and optimal path tree. The simulation results indicate that the model has superior dynamic adaptability and service discovery efficiency compared to the existing models. The mobile-aware service model could be used to improve date acquisition techniques and the quality of mobile-aware service in the IoT.

• 융합보안논문지
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• 제23권1호
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• pp.125-137
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• 2023

공공기관을 필두로 민감정보를 취급하는 기업들은 사이버 공격 예방을 위하여 업무망과 인터넷망을 분리 구축하고, 강한 접근통제를 바탕으로 중요 데이터를 보호하고 있다. 그렇기에 업무망과 인터넷망이 연결되는 접점을 수반하는 시스템은 관리적, 기술적으로 안전한 보안환경 구축이 필수적으로 요구되고 있다. 기관에서 사용하고자 하는 모바일 장치의 경우 기기를 통제하기 위한 MDM(Mobile Device Management) 솔루션이 그 예라 할 수 있다. 이 시스템은 모바일 장치 정보, 사용자 정보 등의 민감정보를 인터넷망에서 취급하여 동작하므로 운영 시 각별한 보안대책이 요구된다. 본 연구에서 인터넷망에서 반드시 운영되어야 하는 시스템에서의 민감정보 데이터 처리를 내부망에서 관리할 수 있도록 모델을 제시하였으며, 이를 망연동 솔루션을 기반으로 한 MDM 솔루션을 중심으로 기능 설계 및 구축하였다.

• ETRI Journal
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• 제34권3호
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• pp.308-318
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• 2012

As mobile markets in most developed countries are rapidly coming close to saturation, it is increasingly challenging to cover the cost of providing the network, as revenues are not growing. This has driven mobile operators, thus far mostly involved in facility-based competition, to turn their attention to network sharing. There exist various types of mobile network sharing (MNS), from passive to active sharing. In this paper, we propose a model, based on the supply-demand model, for evaluating the economic effects of using six types of MNS. Our study measures the economic effects of employing these six types of MNS, using actual WiBro-related data. Considering lower service price and expenditure reduction, the total economic effect from a year's worth of MNS use is estimated to be between 513 million and 689 million USD, which is equal to three to four percent of the annual revenue of Korean mobile operators. The results of this study will be used to support the establishment of a MNS policy in Korea. In addition, the results can be used as a basic model for developing various network sharing models.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.469-472
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• 2000

Security-related issues in mobile communications are increasing. The security requirements of mobile communications for the mobile users include authentication of the mobile user, the data confidentiality, the data confidentiality and the location privacy of mobile user. These services require security features compatible with the wireline networks. However, wireless networks have many restrictions compare to wireline networks such as the limited computational capability of mobile equipment and limited resource(bandwidth) between a mobile user and a fixed network. So, security features for IMT-2000 are designed to meet the limited capacity. In this paper, we analyze the required security features and mechanism, and design network access security feature effective for IMT-2000 Systems. The design includes security functions allocation to each system. Finally, discuss the computational power of each system based on at]coated functions to it

• International Journal of Computer Science & Network Security
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• 제23권10호
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• pp.73-80
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• 2023

The recent growth in the use of mobile devices has contributed to increased computing and storage requirements. Cloud computing has been used over the past decade to cater to computational and storage needs over the internet. However, the use of various mobile applications like Augmented Reality (AR), M2M Communications, V2X Communications, and the Internet of Things (IoT) led to the emergence of mobile cloud computing (MCC). All data from mobile devices is offloaded and computed on the cloud, removing all limitations incorporated with mobile devices. However, delays induced by the location of data centers led to the birth of edge computing technologies. In this paper, we discuss one of the edge computing technologies, i.e., cloudlet. Cloudlet brings the cloud close to the end-user leading to reduced delay and response time. An algorithm is proposed for scheduling tasks on cloudlet by considering VM's load. Simulation results indicate that the proposed algorithm provides 12% and 29% improvement over EMACS and QRR while balancing the load.

• International journal of advanced smart convergence
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• 제6권2호
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• pp.82-88
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• 2017

The data generated by the BSN sensor attached to the human body is mostly mobile. Accordingly, in a mobile cloud environment that processes BSN data, the service should not be fixed in a specific area but be able to support it according to the move. The mobile device must be able to process, filter and transmit the collected BSN data. The cloud server must be able to collect the data processed by the mobile device and provide it as a service. And the transfer of data requires standardized transfer between each device. In this paper, we propose a data delivery method through standard schema when mobile device processes data and provides service in cloud system and a data processing method according to the movement of the mobile device.

• 한국콘텐츠학회논문지
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• 제7권8호
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• pp.66-75
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• 2007

전통적인 SNMP를 이용한 중앙집중형 네트워크 관리 방식은 빈번한 폴링에 의한 통신량의 증가와 특정관리 노드에 병목 현상이 생기는 문제점을 안고 있다. 이러한 문제를 해결하고 극복하기 위한 이동 에이전트에 의한 네트워크 관리방식들이 연구되어 오고 있다. 그러나 이동 에이전트에 의한 네트워크 관리 방식은 관리해야 될 노드가 증가함에 따라 이동되는 데이터량이 누적 증가되어 효율성이 떨어진다. 이러한 문제점을 해결하기 위하여 본 논문에서는 이동에이전트를 이용한 분할관리 방식을 제안한다. 제안된 방법에서는 노드들은 그룹들로 나누어지고 별도의 이동에이전트들에 의하여 관리된다. 각각의 이동에이전트들은 자신의 노드들을 방문하고 정보를 수집한다. 제안된 방법이 효율적임을 실험을 통하여 보였다.

• International Journal of Control, Automation, and Systems
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• 제1권1호
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• pp.134-141
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• 2003

A major research issue associated with service robots is the creation of an environment recognition system for mobile robot navigation that is robust and efficient on various environment situations. In recent years, intelligent autonomous mobile robots have received much attention as the types of service robots for serving people and industrial robots for replacing human. To help people, robots must be able to sense and recognize three dimensional space where they live or work. In this paper, we propose a three dimensional environmental modeling method based on an edge enhancement technique using a planar fitting method and a neural network technique called "Growing Neural Gas Network." Input data pre-processing provides probabilistic density to the input data of the neural network, and the neural network generates a graphical structure that reflects the topology of the input space. Using these methods, robot's surroundings are autonomously clustered into isolated objects and modeled as polygon patches with the user-selected resolution. Through a series of simulations and experiments, the proposed method is tested to recognize the environments surrounding the robot. From the experimental results, the usefulness and robustness of the proposed method are investigated and discussed in detail.in detail.