• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.1123-1126
• /
• 2005

This paper introduces the key features of NCS (Network based Control System), which is quite a new concept in the industrial automation market. Two control systems "DCS" and "PLC" have been recognized as control systems used for process and factory automation during the past decades. However, the market requires more complex functionality, such as monitoring and operation, alarm handling and notification from remote locations using the Web or e-mail. Besides enhancing functionality, interoperability between each device and system is highly required since network and engineering tools provided by many vendors do not cooperate with each others, so that lots of conversion, reconfiguration and reprogramming are required when expanding systems. NCS can meet this requirement, installing leading-edged IT technology using international standards for network and engineering environment. NCS, which is a harmony of web functionality, networkability and a reliable control function, enables information integration and responding to the market's requirements with agility and high reliability.

• 통상정보연구
• /
• 제9권1호
• /
• pp.259-274
• /
• 2007

The paradigm of the global logistics network has been rapidly changing from traditional concept of productivity in cost terms, toward the new characteristics of innovative productivity in terms of economies of scale, economies of scope, and economies of network. As the ship or airplane becomes larger and speedier, the less logistics hub required. The more diverse logistics parties integrate each other horizontally or vertically, the higher synergy effects they get. The more systematic concurrent engineering available for global supply chain management such as Korean manufacturers in China, the higher productivity they get. The paper analyzes these three paradigms of logistics into the application for the Korean manufacturers in China and concludes that the Korean government, the companies in China should be more focused on the governance of the logistics and the intermediary such as the 4th party logistics(4PL) is definitely developed its role and functions based on three paradigms above mentioned.

• 한국정보통신설비학회:학술대회논문집
• /
• 한국정보통신설비학회 2003년도 하계학술대회
• /
• pp.349-352
• /
• 2003

In this paper, we introduce the concept, architecture, and service areas of FS-VDSL specification. We mainly focused on FS-VDSL CPE architecture, which consists of two different types, concentrated architecture and distributed one. We also provide the possibility of CPE adaptation in domestic in-home environment. As a result of our study, distributed CPE architecture is a better candidate to our in-home environment. Another important point of consideration in FS-VDSL adaptation in Korea is the protocol stack of FS-VDSL. Recently, Ethernet-based VDSL technology is more populated than ATM-based VDSL, which is originally adopted in FS-VDSL specification. So, we must deeply think about the modification of protocol stack of FS-VDSL when deploying it in Korea.

• 한국통신학회논문지
• /
• 제16권9호
• /
• pp.809-818
• /
• 1991

최근 사요자의 광대여 및 지능형 서비스의 요구로 협대역 ISDN으로 발전되고 있다. 다라서 본 논문에서는 광대역 ATM망의 설계에 따른 여러고려사항을 사요자의 GOS, 망관리 및 시스템 설계 요구사항의 3가지 관점에서 살펴보아다. 특히 3가지의 고려사항을 광대역 통신망의 성능면에서 서로 형펴에 따라 조명하였으며, 광대역ATM 교환기의 설계를 위한 각종 파라메타들을 망운용 및 관리와 성능면에서 계층 개념을 도입하여 제시하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1989년도 추계학술대회 논문집 학회본부
• /
• pp.186-190
• /
• 1989

A Study for Bad Data Processing in state estimation by a Neural Network is presented. State estimation is the process of assigning a value to an unknown system state variable based on measurement from that system according to some criteria. In this case, the ability to detect and identify bad measurements is extremely valuable, and much time in oder to achieve the state estimation is needed. This paper proposed new bad data processing using Neural Network in order to settle it. The concept of neural net is a parallel distributed processing. In this paper, EBP (Error Back Propagation) algorithm based on three layered feed forward network is used.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1993년도 정기총회 및 추계학술대회 논문집 학회본부
• /
• pp.3-5
• /
• 1993

This paper presents a identification techniques of coherent generators for dynamic equivalents using artificial neural networks. In the developed neural network, inputs are the power system parameters which have a property of coherency. Outputs of the neural network are coherency and error indices which are derived from density measure concept. The learning of developed neural network is carried out by means of error back-propagation algorithm. Identification of coherent generators are implemented by proposed grouping algorithm using coherency and error indices. The proposed method is confirmed by simulations for 39-bus New England system.

• 한국CDE학회논문집
• /
• 제5권1호
• /
• pp.71-78
• /
• 2000

The growths of the World Wide Web and the advances in high-speed network access have greatly changed existing CAD/CAE environment. The m has enabled us to share various distributed product data and to collaborate on a design work. An international standard for the product model data, STEP, and a standard fur the distributed object technology, CORBA, are becoming very important components in the advanced design and manufacturing environment. These two technologies provide background for the sharing of product data and the integration of applications on the network. This study describes a prototype CAD/CAE environment that is integrated on the network by STEP and CORBA. Several application servers servers and client software were developed to verify the proposed concept.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 I
• /
• pp.374-377
• /
• 2003

In this paper, a performance evaluation model of the Fat-Tree network with the multiple-buffered crossbar switches is proposed and examined. Buffered switch technique is well known to solve the data collision problem in the switch network The proposed evaluation model is developed by investigating the transfer patterns of data packets in a switch with output-buffers. Steady state probability concept is used to simplify the analyzing processes. Two important parameters of the network performance, throughput and delay, are then evaluated. To validate the proposed analysis model, the simulation is carried out on the various sizes of Fat-tree networks that use the multiple a$\times$b buffered crossbar switches. It is observed that both analysis and simulation results are match closely.

• ETRI Journal
• /
• 제20권2호
• /
• pp.171-191
• /
• 1998

In this paper, we propose a new heuristic design algorithm for the virtual path (VP)-based ATM network with multiple traffic classes, in which QoS constraints associated with traffic class are taken into account. The minimum bandwidth of VP required to carry given amount of traffic is obtained by utilizing an equivalent bandwidth concept, and the route of each VP is placed so that the network cost is minimized while the QoS requirement is fulfilled To evaluate our design algorithm, we consider two kinds of traffic: voice traffic as low speed service and still picture traffic as high speed service. Through numerical examples, we demonstrate that our design method can achieve an efficient use of network resources, which results in providing a cost-effective VP-based ATM network.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제9권1호
• /
• pp.68-86
• /
• 2015

Future wireless network aims to integrate different radio access networks (RANs) to provide a seamless access and service continuity. In this paper, a new resource denotation method is proposed in the WLAN and LTE heterogeneous networks based on a concept of spectral bandwidth mapping. This method simplifies the denotation of system resources and makes it possible to calculate system residual capacity, upon which an economic model-based network selection algorithm is designed in both under-loaded and over-loaded scenarios in the heterogeneous networks. The simulation results show that this algorithm achieves better performance than the utility function-based access selection (UFAS) method proposed in [12] in increasing system capacity and system revenue, achieving load balancing and reducing the new call blocking probability in the heterogeneous networks.