• Wind and Structures
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• 제3권4호
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• pp.255-266
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• 2000

Wind-induced interference effects on a building are the result of one or more adjacent buildings modifying the flow of wind around it, which may result in a significant increase or decrease in wind loads on the building. Wind loading standards and codes of practice offer little guidance to the designer for assessing the effects of interference. Experimental results on interference effects indicate that code recommendations may be significantly low (unsafe) or uneconomically conservative. The paper presents results of an extensive experimental program to study the wind flow mechanisms and to quantify the extent of wind load modifications on buildings due to interference effects. These results have been simplified and presented from the point-of-view of design and codification for the case of two buildings. Based on these results, general guidelines and limiting conditions defining wind interference are formulated and discussed.

• 전기전자학회논문지
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• 제7권2호
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• pp.281-287
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• 2003

본 연구에서는 전파관리시스템(RFMS)의 효율적 운용을 위하여 전파전파 분석 기능 개선 방안을 도출하였다. 즉, ITU-R에서 권고하는 파라미터별 전파전파 알고리즘, 간섭분석 알고리즘 및 공유기준들에 대한 체계적인 분석을 수행한 후, 사용자가 원하는 환경 및 조건에 적합한 전파간섭 분석 알고리즘과 보호기준을 자동으로 선택해 낼 수 있는 모델 선정 기준안을 도출하였다. 이 결과를 이용하여 RFMS에서 최적의 전파 간섭 분석 알고리즘을 자동 선택하여 효율적으로 분석을 수행하도록 해주는 프로그램 및 그 활용 예를 제시하였다.

• 가족자원경영과 정책
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• 제12권3호
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• pp.59-79
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• 2008

In this study, the investigator examined employees' work-family conflict, and analyzed its relationship with family health, to clarify the two-way influence of work-family and to verify the influence of a family friendship system based upon work-family compatibility and a healthy family. Data from 379 married female and male corporate employees were collected. Collected data were analyzed on the SPSS WIN 12.0 program. Study findings are as follows: First - For the individual, in domain variables of work-family conflict according to socio-demographic characteristics, gender has a significant influence upon strain-based conflict, family interference with work, and time-based conflict. Second - Work domain variables such as occupation, career, employment type, and working hours have a significant influence upon work interference with family, while career, and a working couple have a significant influence upon family interference with work. Finally - average housework hours and children have a significant influence upon work interference with family, whereas the length of a marriage, the average housework hours, and a housework helper have a significant influence upon family interference with work.

• 한국통신학회논문지
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• 제34권7A호
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• pp.548-553
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• 2009

다가올 4세대 이동 통신 시스템은 언제 어디서나 임의의 정보기기로 고속의 네트워크에 접속을 가능하게 하는 것을 목표로 하고 있다. 셀룰러 이동통신 시스템은 이와 같은 요구에 맞춰 나가기 위해서는 주파수 재사용 문제로 인한 셀간의 간섭 문제를 해결해야만 한다. 본 논문에서는 이와 같은 셀간 간섭 문제를 해결하기 위해 문턱 값 기반 영역 결정 (Threshold-Based Region Decision: TBRD)이라는 알고리즘을 제안하고 제안된 알고리즘의 특성과 성능을 모의실험 결과를 통해 분석한다. 그 결과, 제안된 기법은 기존의 UE (User Equipment)의 측정(measurement)만으로 구성되어 적용의 유연성이 높았으며 문틱 값 (Threshold value)의 손쉬운 조정으로 성능 향상까지 이루어 냈다.

• 한국통신학회논문지
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• 제32권2A호
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• pp.179-187
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• 2007

무선 네트워크가 OFDMA 시스템으로 발전되어감에 따라 무선 자원 관리에서 셀 간 간섭 제어가 중요한 이슈가 되고 있다. 인접 셀에서 같은 채널을 할당하는 것은 셀 간 간섭을 야기하므로, 채널 할당은 셀 간 간섭을 낮추도록 이루어져야 한다. 분산 방식의 채널 할당에서는 독립적으로 채널을 할당하면서, 각 셀이 낮은 간섭 수준을 겪도록 해야 한다. 이 논문에서는 간섭 영역의 개념을 소개하고 이를 이용한 두 가지 알고리즘을 제안한다. 두 가지 알고리즘은 이동성이 낮은 사용자를 가정한다. 기본 알고리즘은 할당하고자하는 채널에서 간섭 영역 탐지를 하여 할당을 결정하지만, 조합 알고리즘은 이에 더해 채널 상태도 확인하여 할당을 결정한다. 이들은 낮은 복잡도에 비해 좋은 수율과 공평성 성능을 보인다.

• ETRI Journal
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• 제34권3호
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• pp.297-307
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• 2012

A femtocell is a small cellular base station, typically designed for use in a home or small business. The random deployment of a femtocell has a critical effect on the performance of a macrocell network due to co-channel interference. Utilizing the advantage of a multiple-input multiple-output system, each femto base station (FBS) is able to form a cluster and generates a precoding matrix, which is a modified version of conventional single-cell block diagonalization, in a cooperative manner. Since interference from clustered-FBSs located at the nearby macro user equipment (MUE) is the dominant interference contributor to the coexisting networks, each cluster generates a precoding matrix considering the effects of interference on nearby MUEs. Through simulation, we verify that the proposed algorithm shows better performance respective to both MUE and femto user equipment, in terms of capacity.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2011년도 추계 학술논문 발표대회
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• pp.9-10
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• 2011

Domestic construction industry suffered from the IMF and makes a great effort to improve in 'cost management', 'strengthening the competitiveness of the construction industry'. Therefore, the industry has become interested in improving the productivity of construction and ongoing research is being progressed in various angles. In such circumstances, the needs for a study of concepts and space of the actual construction work place is emerging. This study were utilized BIM to understand the types and causes of problems in space during the finishing work in construction and categorize importance and frequency of occurence through a survey of experts and AHP to analyze the realtive effects of importance then modeling to them to aware of issues and give direction for efficient management. This study is anylize the problem which is caused by same time process in finishing work progress of apartment applied by BIM. and categorize the type of work interference management in finishing work, and anylize by the type of occurence then predict the work interference management through in BIM 3D VIEW and suggest the solutions.

• 디지털산업정보학회논문지
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• 제10권4호
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• pp.109-116
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• 2014

In recent, ISM (Industrial Scientific Medical) band that is 2.4GHz band authorized free of charge is being widely used for smart phone, notebook computer, printer and portable multimedia devices. Accordingly, studies have been continuously conducted on the possibility of coexistence among nodes using ISM band. In particular, the interference of IEEE 802.11b based Wi-Fi device using overlapping channel during communication among IEEE 802.15.4 based wireless sensor nodes suitable for low-power, low-speed communication using ISM band causes serious network performance deterioration of wireless sensor networks. This paper examined a method of identifying channel status to avoid interference among wireless communication devices using IEEE 802.11b (Wi-Fi) and other ISM bands during communication among IEEE 802.15.4 based wireless sensor network nodes in ISM band. To identify channels occupied by Wi-Fi traffic, various studies are being conducted that use the RSSI (Received Signal Strength Indicator) value of interference signal obtained through ED (Energy Detection) feature that is one of IEEE 802.15.4 transmitter characteristics. This paper examines an algorithm that identifies the possibility of using more accurate channel by mixing utilization of interference signal and RSSI mean value of interference signal by wireless sensor network nodes. In addition, it verifies such algorithm by using OPNET Network verification simulator.

• 한국통신학회논문지
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• 제35권3A호
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• pp.238-244
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• 2010

본 논문에서는 다중 셀 다중 사용자 시스템에서 상향링크시 셀 간 간섭을 완화시키기 위한 부분공간 간섭 정렬을 적용했을 때 높은 합용량을 유지하기 위한 사용자 선택 방법을 제안하였다. 제안된 방법은 각 사용자가 인접 셀에 미치는 간섭이 큰 사용자를 선택하고 간섭 정렬을 적용함으로써 간섭 정렬을 하는 사용자 수를 줄이는 동시에 높은 합용량을 유지시킨다. 전산 모의 실험을 통해 전체 합용량을 달성 가능한 최대 합용량의 90%로 설정했을 때 부분공간 간섭 정렬을 위해 채널을 분해 하는 사용자 수가 50%이상 감소하는 것을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권1호
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• pp.216-239
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• 2021

The present work addresses the challenging problem of coordinating power allocation with interference management in multi-robot networks by applying the promising expansion capabilities of multiple-input multiple-output (MIMO) and full duplex systems, which achieves it for maximizing the throughput of networks under the impacts of Doppler frequency shifts and external jamming. The proposed power allocation with interference coordination formulation accounts for three types of the interference, including cross-tier, co-tier, and mixed-tier interference signals with cluster head nodes operating in different full-duplex modes, and their signal-to-noise-ratios are respectively derived under the impacts of Doppler frequency shifts and external jamming. In addition, various optimization algorithms, including two centralized iterative optimization algorithms and three decentralized optimization algorithms, are applied for solving the complex and non-convex combinatorial optimization problem associated with the power allocation and interference coordination. Simulation results demonstrate that the overall network throughput increases gradually to some degree with increasing numbers of MIMO antennas. In addition, increasing the number of clusters to a certain extent increases the overall network throughput, although internal interference becomes a severe problem for further increases in the number of clusters. Accordingly, applications of multi-robot networks require that a balance should be preserved between robot deployment density and communication capacity.