• Computers and Concrete
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• 제12권6호
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• pp.785-802
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• 2013

Ready-mixed soil material, known as a kind of controlled low-strength material, is a new way of soil cement combination. It can be used as backfill materials. In this paper, artificial neural network and nonlinear regression approach were applied to predict the compressive strength of ready-mixed soil material containing Portland cement, slag, sand, and soil in mixture. The data used for analyzing were obtained from our testing program. In the experiment, we carried out a mix design with three proportions of sand to soil (e.g., 6:4, 5:5, and 4:6). In addition, blast furnace slag partially replaced cement to improve workability, whereas the water-to-binder ratio was fixed. Testing was conducted on samples to estimate its engineering properties as per ASTM such as flowability, strength, and pulse velocity. Based on testing data, the empirical pulse velocity-strength correlation was established by regression method. Next, three topologies of neural network were developed to predict the strength, namely ANN-I, ANN-II, and ANN-III. The first two models are back-propagation feed-forward networks, and the other one is radial basis neural network. The results show that the compressive strength of ready-mixed soil material can be well-predicted from neural networks. Among all currently proposed neural network models, the ANN-I gives the best prediction because it is closest to the actual strength. Moreover, considering combination of pulse velocity and other factors, viz. curing time, and material contents in mixture, the proposed neural networks offer better evaluation than interpolated from pulse velocity only.

• 방송공학회논문지
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• 제23권1호
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• pp.3-10
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• 2018

깊이맵은 현재 다양한 분야에서 활용되고 있다. 이러한 깊이맵을 인공 신경망으로 생성하는 연구가 최근 관심을 받고 있다. 본 논문에서는 기존의 기 제작된 깊이맵 생성 알고리즘을 합성곱 신경망으로 구현할 수 있는지에 대한 타당성을 검증한다. 먼저 깊이맵은 관심맵과 운동 히스토리 영상의 가중치 합으로 얻는다. 실험영상과 깊이맵을 합성곱 신경망의 입력과 출력으로 하여, 신경망을 학습시킨다. 정성적, 정량적 실험 결과는 제안한 합성곱 신경망이 깊이맵 생성 방법을 대체할 수 있다는 것을 보여준다.

• 한국통신학회논문지
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• 제33권4A호
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• pp.411-417
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• 2008

본 논문에서는 multi-hop 블루투스 스캐터넷을 형성하는 BSFP (Bluetooth Scatternet Formation Protocol)을 제안한다. BSFP는 각각의 블루투스 기기에서 독립적으로 수행되고, 초기단계에서 주변 기기들에 대한 정보를 요구하지 않으며, 모든 기기들이 블루투스의 통신 가능 범위 안에 위치하지 않아도 스캐터넷을 형성할 수 있다. BSFP는 1) 자신의 주위에 어떤 노드들이 있는지를 찾는 Init 단계, 2) 각각의 노드가 국부적 정보만을 가지고 스캐터넷을 형성하는 Ready 단계, 3) 연결된 링크를 이용하여 통신을 하는 Complete 단계로 구성된다. BSFP에서는 스캐터넷 형성을 완료할 때까지 걸리는 실행시간이 기기들의 수가 늘어나도 크게 변하지 않으며, 인접 기기들 간의 통신 링크의 수가 많은 스캐터넷을 형성하여 신뢰도 높은 mobile ad hoc network을 구성할 수 있도록 해 준다.

• International Journal of Computer Science & Network Security
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• 제23권7호
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• pp.165-170
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• 2023

Scheduling algorithms plays a significant role in optimizing the CPU in operating system. Each scheduling algorithms schedules the processes in the ready queue with its own algorithm design and its properties. In this paper, the performance analysis of First come First serve scheduling, Non preemptive scheduling, Preemptive scheduling, Shortest Job scheduling and Round Robin algorithm has been discussed with an example and the results has been analyzed with the performance parameters such as minimum waiting time, minimum turnaround time and Response time.

• 한국멀티미디어학회논문지
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• 제25권2호
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• pp.280-286
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• 2022

In order to efficiently collect data, it is essential to locate the facilities and analyze the movement data. The current technology for location collection can collect data using a GPS sensor, but GPS has a strong straightness and low diffraction and reflectance, making it difficult for indoor positioning. In the case of indoor positioning, the location is determined by using wireless network technologies such as Wifi, but there is a problem with low accuracy as the error range reaches 20 to 30 m. In this paper, using BLE 4.2 built in Raspberry Pi, we implement Bluetooth Smart Ready. In detail, a beacon was produced for Advertise, and an experiment was conducted to support the serial port for data transmission/reception. In addition, advertise mode and connection mode were implemented at the same time, and a 3-count gradual algorithm and a quadrangular positioning algorithm were implemented for Bluetooth RSSI error correction. As a result of the experiment, the average error was improved compared to the first correction, and the error rate was also improved compared to before the correction, confirming that the error rate for position measurement was significantly improved.

• 한국멀티미디어학회논문지
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• 제22권4호
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• pp.502-514
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• 2019

Existing user research methods are subject to a variety of research conditions such as the amount and variety of data collected and the expertise of the facilitator of a group research session. In this study, we propose a new user research methodology using an 'Issue-Network' system, which is developed based on the theory and methods of social network analysis. The Issue-Network is designed to define problem spaces from the issues raised by users in a group research session in a form of an interactive network graph. The system helps to break out of ordinary perspectives of looking into problem spaces by enabling an alternative and more creative way to connect issues in the network. In this study, we took a case study of generating the Issue-Network on behalf of the problems raised by users in various driving-related situations. We were able to draw three navigation usage scenarios that cover relatively important problem spaces: safety and being ready for the unexpected, smart navigation and notifications, making use of the spare time. In the future, the Issue-Network system is expected to be used as a tool to identify problems and derive solutions in group research sessions involving a large number of users.

• 정보와 통신
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• 제20권11호
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• pp.1550-1559
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• 2003

The convergence of fixed and wireless networks in data communication is providing the necessary driver for M2M commerce to take-off. The opportunities provided by M2M Commerce areonly limited by imagination. Automotive Fleet and Freight, Tolling, Water and Power Metering, Supply Chain Management including Asset Management, Remote Monitoring and Diagnostics, Energy Management and Access Control and Security are among the many M2M applications that are currently getting rolled out. ARC Group expects the worldwide solutions market to be worth in excess of US$ 100 billion by 2007. In addition, operator revenues worldwide from the transport of Telematics data alone will rise from US$ 3.5 billion in 2002 to US$ 78 billion by 2007. This paper discusses some of the lifestyle and business opportunities provided by M2M Commerce in the new ear of network convergence. It also provides some case studies to demonstrate the benefits of M2M Commerce across the supply chain. The key focus of the paper is on achieving enhanced lifestyle, cost reduction, improved profitability and enhanced customer relationship management through M2M Commerce.

• 디지털산업정보학회논문지
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• 제11권4호
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• pp.25-31
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• 2015

Smart healthcare environments which merge medical and IT technology are getting ready for the third generation centering EHR from current second generation. As a basic technology for the introduction and activation of EHR systems it requires heterogeneous network interworking techniques between various wired and wireless medical devices. Interworking technology for heterogeneous network among various medical devices is needed to introduce EHR system. The heterogeneous network interworking technology is needed for construction of a reliable data system to convert each of unstructured data into structured data. Therefore, in this paper, we identify the domestic and international trends of smart medical field and analyze the characteristics of wired and wireless communication technology that is used in a heterogeneous network. and also suggest requirements needed for interworking technology and provide interworking technology based on them. we expect that proposed method which is designed for smart healthcare environments would provide a basic architecture needed for third smart medical technology generation.

• 정보처리학회논문지C
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• 제18C권6호
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• pp.413-422
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• 2011

오버레이 네트워크는 인터넷 연결성을 손상시키지 않고 새로운 네트워킹 기능을 제공할 수 있는 현실적인 방안이다. 본 논문은 서비스 오버레이의 용이한 구성을 지원하는 사용자 정의 네트워크 서비스를 소개하고 구성된 오버레이 네트워크 상에서 고속 데이터 평면 처리를 수행하는 서비스 게이트웨이의 하드웨어 및 소프트웨어 구조를 살펴본다. 또한, 멀티캐스트 응용 지원을 위한 서비스 오버레이 네트워크의 생성 과정을 예시한다. 국가과학기술연구망에 구축된 실험환경에서 서비스 게이트웨이의 성능 평가를 수행하고 수백 Mbps급 멀티미디어 서비스의 적용가능성을 확인한다.

• International Journal of Contents
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• 제1권2호
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• pp.13-17
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• 2005

Base Station Controller which belongs to IMT-2000(International Mobile Telecommunication - 2000) network has several types of structure for efficient control protocol. This difference of structure occurs two different protocols for call handling. Recently the need of IMT-2000 is highly increasing, so it is important to analyze the performance of processors and IPC(Inter-Processor Communication) module with structure of BSC and protocol difference. This paper presents the performance comparison of different types of BSC in view of processor utilization, waiting time, queue length and QoS(Quality of Service) through the simulation model.