• 한국군사과학기술학회지
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• 제14권1호
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• pp.74-83
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• 2011

In this paper, we propose an architecture design of military operation system utilizing cellular networks. The main contribution of this paper is to provide a cost-effective military operation solution for ground forces, which is based on IT(information technology). By employing the cellular phones of officers' and non-commissioned officers' as the tools of operational communication, the proposed system can be constructed in the minimum duration and be built on the four components: command and control system, gateway, security system, and terminal(cell phone). This system is most effective for the warfare of limited area, but the effectiveness does not decrease under the total war covering the whole land of Korea. For the environmental change of near future, expanded architecture is also provided to utilize the functionalities of smart phones.

• 한국전자파학회논문지
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• 제14권9호
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• pp.912-918
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• 2003

본 논문에서는 셀룰러 CDMA와 IMT-2000 중계기 에 사용되는 이중대역 모노폴 안테나를 설계 및 구현하였다.3차원 전산모의실험 프로그램인 HFSS(High Frequency Structure Simulator)를 사용하여 안테나론 설계하였으며, 전기적 특성 측정은 HP 8720C네트웍 분석기론 사용하였다. 측정된 S$_{11}$값은 셀룰러 CDMA와 IMT-2000 전 대역에서 -l0.9 dB 이하의 특성을 보였으며, 859 MHz와 2027.5 MHz에서 각각 2.38 dBi와 4.02 dBi의 이득을 갖는 전방향 복사패턴을 전산모의실험 결과로 확인하였다. 구현된 안테나는 소형으로서 상용화시 낮은 가격으로 생산할 수 있다.다.

• 대한안전경영과학회지
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• 제6권2호
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• pp.187-197
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• 2004

The recycling cell formation problem means that disposal products are classified into recycling product families using group technology in their end-of-life phase. Disposal products have the uncertainties of product condition usage influences. Recycling cells are formed considering design, process and usage attributes. In this paper, a new approach for the design of cellular recycling system is proposed, which deals with the recycling cell formation and assignment of identical products concurrently. Fuzzy ART neural networks are applied to describe the condition of disposal product with the membership functions and to make recycling cell formation. The approach leads to cluster materials, components, and subassemblies for reuse or recycling and can evaluate the value at each cell of disposal products. Disposal refrigerators are shown as an example.

• 한국IT서비스학회지
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• 제11권1호
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• pp.239-246
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• 2012

The user increases around the WiBro and in which the mobile broad band service is the wireless internet base technology HSDPA, that is the cellular phone foundation technique, and moreover the issue about the user effective quality guarantee emerges but the quality control of the wireless network is the incomplete actual condition. Therefore, the reliability verification according to the development of the system for the performance measure for the continued wireless data service and it and evaluation are needed for the quality control. In this paper, the wireless data service quality measurement system was implemented with the design. The same test environment as the existing network performance measurement program was built for the reliability verification of the embodied device for measuring quality and evaluation and the cost performance was performed. It could confirm that design and embodied wireless data service quality measurement system operated accurately in this paper through the quality measure result value analysis.

• 한국산업정보학회논문지
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• 제11권1호
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• pp.69-76
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• 2006

텔레매틱스란 통신과 정보과학의 합성어로 운전경로 안내, 차량 사고나 도난감지, 교통상황 및 각종 생활 편의 정보를 운전자에게 실시간으로 제공한다. 본 논문에서는 텔레매틱스 서 비스를 위하여 내장형 리눅스 기반의 CDMA 및 GPS를 장착한 텔레매틱스 단말기를 제작하고, 휴대 전화를 이용하여 원격지에서 인터넷에 연결된 텔레매틱스 서버와 차량 단말기간의 통신을 통해 차량의 상태를 확인하고, SMS(Short Message Service)를 이용하여 차량을 제어하는 방법을 제안하고 구현한다. 이를 위해 JAVA 기반의 휴대 전화 단말 플랫폼인 SK-VM을 이용하여 제안하는 시스템을 설계 및 구현하고 이를 검증한다.

• 한국정보통신학회논문지
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• 제3권1호
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• pp.129-139
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• 1999

DECT(Digital Enhanced Cordless Telecommunications)는 사설교환기에 이동서비스를 제공하기 위한 통신규약으로 셀 반경이 100∼200 m 정도인 협역상의 이동서비스를 제공하는 초소형 셀룰라(pico-cellular) 방식이고, PSTN을 이용한 저가형 통신서비스를 제공함으로써 빌딩의 옥내형 이동통신을 위한 GSM의 이상적인 보완책으로 각광을 받고 있다. 본 논문에서는 링크제어, 오류제어, 시퀀스제어, 흐름제어 기능의 수행으로 상위 네트워크 계층에게 신뢰성 있는 통신 링크를 제공하고, 가입자 수용용량의 증대를 위해 증설되는 기지국과 기지국 접속장치의 위치에 무관하게 실시간 서비스를 제공할 수 있는 데이타 링크제어 계층의 구현을 위해 이의 구조와 기능을 분석하고 설계하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권2호
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• pp.514-535
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• 2019

Information-centric networks operate under the assumption that all network components have built-in caching capabilities. Integrating the caching strategies of information centric networking (ICN) with wireless virtualization improves the gain of virtual infrastructure content caching. In this paper, we propose a framework for software-defined information centric virtualized wireless device-to-device (D2D) networks. Enabling D2D communications in virtualized ICN increases the spectral efficiency due to reuse and proximity gains while the software-defined network (SDN) as a platform also simplifies the computational overhead. In this framework, we propose a joint virtual resource and cache allocation solution for latency-sensitive applications in the next-generation cellular networks. As the formulated problem is NP-hard, we design low-complexity heuristic algorithms which are intuitive and efficient. In our proposed framework, different services can share a pool of infrastructure items. We evaluate our proposed framework and algorithm through extensive simulations. The results demonstrate significant improvements in terms of visiting latency, end user QoE, InP resource utilization and MVNO utility gain.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권1호
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• pp.114-130
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• 2021

With the drastic growth of Information and Communication Technology (ICT) industry, global energy consumption is exponentially increased by mobile communications. The huge energy consumption and increased environmental awareness have triggered great interests on the research of dynamic distribution of cell user and traffic, and then designing the energy efficient cellular network. In this paper, we explore the temporal and spatial characteristics of human mobility and traffic distribution using real data set. The analysis results of cell traffic illustrate the tidal effect in temporal and spatial dimensions and obvious periodic characteristics which can be used to design Base Station (BS) dynamic with sleeping or shut-down strategy. At the same time, we designed a new Cell Zooming and BS cooperation mode. Through simulation experiments, we found that running in this mode can save about 35% of energy consumption and guarantee the required quality of service.

• 디지털콘텐츠학회 논문지
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• 제11권4호
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• pp.433-443
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• 2010

본 논문에서는, 무선 셀룰러 네트워크와 Mobile IP 기반의 네트워크를 위해 제안되었던 기존의 다양한 위치 관리 기법들에 대한 광범위한 소개 및 분류법을 제시한다. 또한, 기존에 제안되었던 다양한 위치 관리 기법들로부터, 네트워크의 종류와 관계없이 위치 관리 기법들의 이해를 돕기 위한 유용한 가이드를 제공할 수 있는 공통의 핵심 기술들 및 주요 설계상의 목표와 성능 고려 사항 등을 도출해 낸다. 본 논문의 목적은 위치 관리를 위한 새로운 기법을 제안하는 것이라기보다는, 기존에 제안되었던 위치관리 기법들의 다양한 설계상의 핵심적인 특징들을 도출해내고, 차세대 무선 이동 네트워크에서 보다 효율적이고 최적화된 위치 관리 기법을 설계하기 위해 근간이 되는 핵심 개념 및 기술들에 대한 통찰력을 향상시키는 것을 그 목적으로 한다. 또한, 이러한 근간이 되는 개념 및 기술들은 네트워크의 종류와 관계없이 향후의 이동 컴퓨팅 환경에서 보다 효율적인 이동성 및 서비스 품질 제공을 위해서도 쉽게 적용될 수 있을 것으로 기대되는 바이다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.849-851
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• 2003

A location-based service or LBS in a cellular telephone network is a service provided to the subscriber based on his current geographic location. This position can be known by user entry or a GPS receiver that he carries with him, but most often the term implies the use of a function built into the cell network that uses the known geographic coordinates of the base stations through which the communication takes place. One implication is that knowledge of the coordinates is owned and controlled by the network operator, and not by the end user. Location utility service provides two kinds of functions, geocoder and reverse geocoder. Geocoder converts an address into a coordinate and reverse geocoder changes a coordinate into an address. Because location utility service is the first step to progress LBS, various servises such as directory, routing, presentation, and etc require to access that. In this paper, we will describe the architecture of LBS platform and the concept and the role of location utility service.