• 한국멀티미디어학회논문지
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• 제24권2호
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• pp.255-266
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• 2021

Most common web or application system architectures have central network. As a result, central network can be supervised and controlled in all situation. And It has the advantage of easy to manage and fast to work. However, central network have a disadvantage of weak to security and unclear. In particular, many institutions used by web system be has many problems by central network. In this paper, we proposed blokchain technology based on ethereum to resolve of problem and trading structure that arise in cental network. We propose a decentralized application based on points including cryptocurrency functions and smart contract to the advantages of blockchain with a decentralized structure. The results of the performance experiment are as follows; It has shown the advantages of reliable use and security in a variety of environments(Windows, Ubuntu, Mac).

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.47-52
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• 2005

In this paper we describe SLA metrics and software architecture for newly upcoming IP TV service. Firstly we show the general description for IP TV. This consists of brief description of IP TV, the general figure of configuration and elements of IP TV network and communication protocol stack of IP TV data transmission for deriving communication quality parameter. And we propose SLA metrics depending on quality measurement point. According to the measurement point the measurable SLA metrics are different. The total view of the IP TV SLA measurement and management architecture is shown. When the quality measurement point is the routers that consist of internet node, the IP media NMS is the quality collection system. And when the quality measurement point is the IP TV STB(Set-Top Box), the IP media collector and Quality Collection Server are the quality collection system. And we show the software block diagram of IP TV SLA processing system and the other related network management systems.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권12호
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• pp.5948-5971
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• 2019

Estimating loss rates with the packet traces captured from some point in the middle of the network has received much attention within the research community. Meanwhile, existing intermediate-point methods like [1] require the capturing system to capture all the TCP traffic that crosses the border of an access network (typically Gigabit network) destined to or coming from the Internet. However, limited to the performance of current hardware and software, capturing network traffic in a Gigabit environment is still a challenging task. The uncaptured packets will affect the total number of captured packets and the estimated number of packet losses, which eventually affects the accuracy of the estimated loss rate. Therefore, to obtain more accurate loss rate, a method of strengthening packet loss measurement from the network intermediate point is proposed in this paper. Through constructing a series of heuristic rules and leveraging the binomial distribution principle, the proposed method realizes the compensation for the estimated loss rate. Also, experiment results show that although there is no increase in the proportion of accurate estimates, the compensation makes the majority of estimates closer to the accurate ones.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2000년도 추계정기학술대회:지능형기술과 CRM
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• pp.427-436
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• 2000

The prediction of stock price index is a very difficult problem because of the complexity of the stock market data it data. It has been studied by a number of researchers since they strong1y affect other economic and financial parameters. The movement of stock price index has a series of change points due to the strategies of institutional investors. This study presents a two-stage forecasting model of stock price index using change-point detection and artificial neural networks. The basic concept of this proposed model is to obtain Intervals divided by change points, to identify them as change-point groups, and to use them in stock price index forecasting. First, the proposed model tries to detect successive change points in stock price index. Then, the model forecasts the change-point group with the backpropagation neural network (BPN). Fina1ly, the model forecasts the output with BPN. This study then examines the predictability of the integrated neural network model for stock price index forecasting using change-point detection.

• 상하수도학회지
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• 제27권1호
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• pp.1-10
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• 2013

Major issues in water supply service have changed from expansion of service area to improvement of service quality, i.e., water quality and safety, and early response to emergency situation. This change in the service concept triggers the perceptions of limitation with the current centralized water supply system and of necessities of decentralized (distributed) water supply system (DWSS), which can make up the limitations. DWSS can reduce the possibility of water supply outage by establishing multiple barriers such as emergency water supply system, and secure better water quality by locating treatment facilities neighboring consumers. On the other hand, fluctuation of water demand will be increased due to the reduced supply area, which makes difficult to promptly respond the fluctuating demand. In order to supplement this, hybrid water supply system was proposed, which combined DWSS with conventional water supply system using distributing reservoir to secure the stability of water supply. The Optimal connection point of DWSS to existing water supply network in urban area was determined by simulating a supply network using EPANET. Optimal location of decentralized water treatment plant (or connection point) is a nodal point where changes in pressure at other nodal points can be minimized. At the same time, the optimal point should be selected to minimize hydraulic retention time in supply network (water age) to secure proper water quality. In order to locate the point where these two criteria are satisfied optimally, Distance measure method, one of multi-criteria decision making was employed to integrate the two results having different dimensions. This methodology can be used as an efficient decision-support criterion for the location of treatment plant in decentralized water supply system.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.778-781
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• 2005

In this paper, we describe a development of a Bluetooth Access Point for the WAN connection of home network devices. Especially, users can access the PSTN at home instead of expensive digital cellular network through the AP, using the 'one-phone', which is the Bluetooth enabled cellular phone. The simultaneous benchmark test about telephone service and LAN access service shows the perfect compatibility and reasonable performance of the access point. The one-phone service can become a convergence of wired and wireless communication through the AP.

• 한국정보통신학회논문지
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• 제9권7호
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• pp.1445-1451
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• 2005

홈 네트워크란 일반적으로 PC를 비롯한 가정 내의 가전기기들이 하나의 네트워크로 통합되어 통신이 가능하도록 하는 것을 의미한다. 21세기에 들어서 홈 네트워크 환경을 위한 여러 가지 기술들이 제시되었다. 대표적으로 HomePNA, IEEE1394, ethernet lan, 블루투스 등이 있다. 일반적으로 홈 네트워크를 구현하는데 있어 가전기기간 데이터를 전송 할 경우 표준 직렬 인터페이스인 RS232를 이용한다. 그러나 RS232를 이용하여 홈 네트워크를 구현할 경우 다음과 같은 문제점이 있다. 즉, point-to-point 방식을 사용하여 각각의 기기를 모두 RS232로 연결해야 한다는 것이다. 이를 경우 기기의 숫자만큼 회선이 늘어남으로 인해 시스템 자체가 복잡해지고 비용도 증가한다. 이러한 문제점을 개선하고자 이 논문에서는 RS422 Multi-drop mode 시리얼 통신를 이용하여 흠 네트워크를 설계하였고 임베디드 리눅스 시스템으로 제어하였다. 그리고 홈 네트워크 가상환경을 구현하기 위해서 PIC를 이용하여 모터 및 센서를 RS422와 연결하였다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 추계종합학술대회
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• pp.512-516
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• 2005

홈 네트워크란 일반적으로 PC를 비롯한 가정 내의 가전기기들이 하나의 네트워크로 통합되어 통신이 가능하도록 하는 것을 의미한다. 21세기에 들어서 홈 네트워크 환경을 위한 여러 가지 기술들이 제시되었다. 대표적으로 HomePNA, IEEE1394, ethernet lan, 블루투스 등이 있다. 일반적으로 홈 네트워크를 구현하는데 있어 가전기기간 데이터를 전송 할 경우 표준 직렬 인터페이스인 RS232를 이용한다. 그러나 RS232를 이용하여 홈 네트워크를 구현할 경우 다음과 같은 문제점이 있다. 즉, point-to-point 방식을 사용하여 각각의 기기를 모두 RS232로 연결해야 한다는 것이다. 이를 경우 기기의 숫자만큼 회선이 늘어남으로 인해 시스템 자체가 복잡해지고 비용도 증가한다. 이러한 문제점을 개선하고자 이 논문에서는 RS422 Multi-drop mode 시리얼 통신을 이용하여 홈 네트워크를 설계하였고 임베디드 리눅스 시스템으로 제어하였다. 그리고 홈 네트워크 가상환경을 구현하기 위해서 PIC를 이용하여 모터 및 센서를 RS422와 연결하였다.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2005년도 Proceedings of ISRS 2005
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• pp.678-682
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• 2005

IETF suggested AAA for safe and reliable user authentication on various network and protocol caused by development in internet and increase in users. Diameter standard authentication system does not provide mutual authentication and non-repudiation. AAA authentication system using public key was suggested to supplement such Diameter authentication but application in mobile service control nodes is difficult due to overhead of communication and arithmetic. ID based AAA authentication system was suggested to overcome such weak point but it still has the weak point against collusion attack or forgery attack. In this thesis, new ID based AAA authentication system is suggested which is safe against collusion attack and forgery attack and reduces arithmetic quantity of mobile nodes with insufficient arithmetic and power performance. In this thesis, cryptological safety and arithmetical efficiency is tested to test the suggested system through comparison and assessment of current systems. Suggested system uses two random numbers to provide stability at authentication of mobile nodes. Also, in terms of power, it provides the advantage of seamless service by reducing authentication executing time by the performance of server through improving efficiency with reduced arithmetic at nodes.

• 한국항해항만학회지
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• 제29권6호
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• pp.555-560
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• 2005

전체 시스템을 최적상태로 유지하기 위한 정보공유의 필연성 등으로 대다수의 제어 시스템이 디지털 제어 시스템으로 대체되고 있다. 이러한 디지털 제어 시스템이 원활하게 운영되기 위해서는 전통적인 점대점 연결방식이 아닌 네트워크를 기반으로 한 시스템이 필수적이며, 이러한 산업용 네트워크를 지능형 항만 물류 시스템에 적용하기 위할 연구가 최근 다양하게 이루어지고 있다. 본 논문에서는 NMEA 2000의 기반이 되는 CAN 프로토콜을 이용한 크레인 시스템의 타당성을 검증하기 위하여 단순화된 네트워크 기반 제어 시스템을 구현하였다.