• 산업공학
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• 제12권1호
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• pp.79-93
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• 1999

As most of information systems developed are data-centric rather than process-centric, it is difficult for users to understand and manage the system from the viewpoint of work processes. To resolve the problem of the data-centric design, we propose a new method to design WFMSs(Workflow Management Systems), which are focused on processes and modified from current information engineering methods. In this research, the drawing approval and engineering change approval process of a K manufacturing company has been analyzed as a sample process. This method takes two steps, i.e., process analysis and system design. In the prosess analysis, data and processes are analyzed, and functions and tasks are derived from the processes. In the system design, a data model for the operation of WFMS is designed, and based on this data model, build-time and run-time functions of WFMS are designed.

• 치과방사선
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• 제16권1호
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• pp.69-79
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• 1986

The purpose of this investigation was to know correlation of mean values between centric occlusion and centric relation by the cephalogram in Angle's Class Ⅰ and Ⅲ malocclusion subjects. 22 adults with Angle's Class Ⅰ malocclusion (17 men and 5 women, 21 to 27 years of age) and 14 adults with Angle's Class Ⅲ malocclusion (10 men and 4 women, 21 to 27 years of age) were selected from the dental students in Yonsei University. Each subject was given two lateral cephalometric radiographies and cephalometric analysis was performed. All data from these analyses was recorded and statistically processed with CYBER computer system. 1. The results were obtained as follows: There was a strong positive correlation between centric occlusion and centric relation in all subjects with Angle's Class Ⅰ and Ⅲ malocclusion. 2. In Angle's Class Ⅰ malocclusion, measurements in lower facial height revealed significant difference between centric occlusion and centric relation (P<0.05). In Angle's Class Ⅲmalocclusion, measurements in facial axis angle, mandibular plane angle, convexity of A point, lower incisor protrusion, lower facial height revealed significant difference between centric occlusion and centric relation (P<0.05). 3. When the mandible was moved from centric occlusion to centric relation, the mean distance of mandibular movement was 1.27㎜ (0.2-2.8㎜) in Angle's Class Ⅰ malocclusion, 1.70㎜ (0.55-4.15㎜) in Angle's Class Ⅲ malocclusion, and 1.44㎜ (0.2-4.15㎜) in all subjects.

• International Journal of Computer Science & Network Security
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• 제21권6호
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• pp.169-180
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• 2021

Since machine learning was invented, there have been many different machine learning-based algorithms, from shallow learning to deep learning models, that provide solutions to the classification tasks. But then it poses a problem in choosing a suitable classification algorithm that can improve the classification/detection efficiency for a certain network context. With that comes whether an algorithm provides good performance, why it works in some problems and not in others. In this paper, we present a data-centric analysis to provide a way for selecting a suitable classification algorithm. This data-centric approach is a new viewpoint in exploring relationships between classification performance and facts and figures of data sets.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권5호
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• pp.2267-2285
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• 2016

Information Centric Networking that uses content name instead of IP address as routing identifier can handle challenges such as traffic explosion and user mobility, but it also suffers from scalability and incompatibility problems. In this paper by combining the concept of software defined networking and Internet end to end arguments, we propose a wide area deployable software defined information centric networking service model named SD-ICN. SD-ICN employs a dual space structure that separates edge service network and core transmission network. The enhanced SDN techniques are used in edge service network in order to implement intelligent data routing and caching, while traditional IP technique is reserved in core transmission network so as to provide wide area high speed data transmission. Besides, a distributed name resolution system based on the cooperation of different controllers is also presented. The prototype experiments in our campus network show that SD-ICN can be deployed in a scalable and incremental way with no modification of the core network, and can support typical communication modes such as multicast, mobility, multihoming, load balancing, and multipath data transmission effectively.

• ETRI Journal
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• 제44권2호
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• pp.313-326
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• 2022

This study presents a noble scheme for distributed and parallel simulations with optimized agent placement for simulation instances. The traditional parallel simulation has some limitations in that it does not provide sufficient performance even though using multiple resources. The main reason for this discrepancy is that supporting parallelism inevitably requires additional costs in addition to the base simulation cost. We present a comprehensive study of parallel simulation architectures, execution flows, and characteristics. Then, we identify critical challenges for optimizing large simulations for parallel instances. Based on our cost-benefit analysis, we propose a novel approach to overcome the performance constraints of agent-based parallel simulations. We also propose a solution for eliminating the synchronizing cost among local instances. Our method ensures balanced performance through optimal deployment of agents to local instances and an adaptive agent placement scheme according to the simulation load. Additionally, our empirical evaluation reveals that the proposed model achieves better performance than conventional methods under several conditions.

• 패션비즈니스
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• 제7권5호
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• pp.32-44
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• 2003

In apparel industry, the worksheet or product specification document has the function of products design. Drawing up worksheet exactly is important to quality control of apparel products. Every company needs to manage the product data of design-centric to establish TQM environment. In order to control the quality data of design-centric, an apparel worksheet system was developed by using the function of product data management system.

• 한국컴퓨터정보학회논문지
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• 제25권1호
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• pp.1-11
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• 2020

본 논문에서는 프로세서 중심 컴퓨터 구조에서 개발된 MPI 병렬 프로그램을 수정하지 않고 메모리 중심 컴퓨터 구조에서 더 효율적으로 수행시키는 기술을 제안한다. 본 연구에서 제안하는 기술은 메모리 중심 컴퓨터 구조가 가지는 빠른 대용량 공유 메모리 특징을 이용하여 MPI 표준 라이브러리 함수가 수행하는 네트워크 통신을 통한 느린 데이터 전달을 공유 메모리를 통한 빠른 데이터 전달로 대체하여 효율성을 얻는다. 본 연구에서 제안한 기술은 두 개의 프로그램에 구현되었다. 첫 번째 프로그램은 MC-MPI-LIB라고 불리는 수정된 MPI 라이브러리인데 이는 기존 MPI 표준 라이브러리 함수의 의미를 유지하면서 메모리 중심 컴퓨터 구조에서 더 효율적으로 수행한다. 두 번째 프로그램은 MC-MPI-SIM이라고 불리는 시뮬레이션 프로그램인데 이는 프로세서 중심 컴퓨터 구조 상에서 메모리 중심 컴퓨터 구조의 수행을 시뮬레이션한다. 본 논문에서 제안한 기술은 도커 가상화 상에서 구현된 분산 시스템 환경에서 개발하고 시험하였다. 다수의 MPI 병렬 프로그램을 이용하여 제안한 기술의 성능을 측정한 결과 메모리 중심 컴퓨터 구조에서 더 높은 성능으로 수행 가능함을 보였으며, 특히 통신 오버헤드 비율이 높은 MPI 병렬 프로그램의 경우 매우 높은 성능으로 수행 가능하다는 점을 확인하였다.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제7권5호
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• pp.177-188
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• 2018

최근 웹, 소셜 네트워크 서비스, 모바일, 사물인터넷 등의 ICT 기술의 발전으로 인해 처리 및 분석이 필요한 그래프 데이터의 규모가 급속하게 증가하였다. 이러한 대규모 그래프 데이터는 단일 기기에서의 처리가 어렵기 때문에 여러 기기에 나누어 분산/병렬 처리하는 것이 필요하다. 기존 그래프 처리 알고리즘들은 단일 메모리 환경을 기반으로 연구되어 분산/병렬 처리환경에 적용되기 힘들다. 이에 대규모 그래프의 보다 효과적인 분산/병렬 처리를 위해 정점 중심 방식의 그래프 처리 시스템들과, 정점 중심 방식의 단점을 보완한 블록 중심 방식의 그래프 처리 시스템들이 등장하였다. 이러한 시스템들은 초기 그래프 분할 상태가 전체 처리 성능에 상당한 영향을 미친다. 한 번에 최적의 상태로 그래프를 분할하는 것은 매우 어려운 문제이므로, 그래프 처리 시간에 점진적으로 그래프 분할 상태를 개선하는 여러 로드 밸런싱 기법들이 연구되었다. 그러나 기존 기법들은 대부분 정점 중심 그래프 처리 시스템을 대상으로 하여 블록 중심 그래프 처리 시스템에 적용이 어렵다. 본 논문에서는 블록 중심 그래프 처리 시스템을 대상으로 적용 가능한 로드 밸런싱 기법을 제안한다. 제안 기법은 동적으로 블록을 재배치하여 점진적으로 그래프 분할 상태를 개선시키며, 해를 찾아나가는 과정에서 지역 최적해를 벗어나기 위한 블록 분할 전략을 함께 제시한다.

• Journal of information and communication convergence engineering
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• 제18권1호
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• pp.22-27
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• 2020

Content centric networking (CCN) is regarded as promising internet architecture because it can provide network efficiency in terms of bandwidth consumption by separating contents from a specific network location and decrease network congestion events. However, the application of a CCN does not widely consider the side effects of mobile devices, particularly mobile content sources. For content source mobility, a full routing update is required. Therefore, in this study, a route optimization scheme is proposed for mobile content sources in a CCN environment to provide low communication overhead, short download time, and low resource consumption. The proposed scheme establishes a direct path between content requesters and a mobile content source for the exchange of interest and data packets using interest-piggybacked data packets. Based on the inherent CCN naming characteristics, the content source does not know the name prefix of the content consumer, and thus the proposed optimized CCN scheme utilizes the content router in the home domain of the content source.

• 전자통신동향분석
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• 제33권5호
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• pp.86-94
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• 2018

Information-Centric Networking (ICN) has been recognized as a new networking technology for the upcoming data-centric 4th industrial revolution based society. In addition, it has noted that Pub/Sub-style communication is rapidly growing in areas including big data processing and microservice as well as the existing Internet of Things and social networking technologies. Therefore, ICN is highly needed to efficiently support Pub/Sub-style communication for successful deployment as a next-generation network infrastructure technology. This paper summarizes the recent research trends of Pub/Sub communication technologies over ICN, and discusses future research issues.