• Annual Conference of KIPS
• /
• 2018.05a
• /
• pp.317-319
• /
• 2018

최근 발생하는 데이터는 대용량이며, 형태가 다양하고 빠르게 생성되는 특징이 있다. 이러한 데이터는 CPU, 인메모리 기반인 기존의 데이터 처리 시스템에서 처리하는데 많은 시간이 소모된다. 이 문제를 해결하기 위해 GPU 기반 데이터 집약 시스템이 출현하기 시작했다. 하지만, 이러한 시스템의 성능을 종합적으로 측정하는 테스트 결과는 시스템마다 다른 기준으로 제공하고 있다. 이에 따라, 개발자 및 사용자는 성능 병목 현상을 탐색하고 해결하는 데 큰 어려움을 겪을 수 있다. 즉, 이러한 다른 기준으로는 개발자 및 사용자가 시스템의 통합적인 성능 비교 분석을 수행하기 힘들다. 이러한 문제를 해결하기 위해서, 본 논문은 원스탑 테스팅 프레임워크인 BenchGAD 를 제안하고자한다.

• Journal of Navigation and Port Research
• /
• v.32 no.2
• /
• pp.141-148
• /
• 2008

This paper is structured into three main parts and a conclusion. The main section provide definitions of efficiency, effectiveness and performance in terms of the distribution channel, followed by a review of related performance measurement, before discussing difficulties of measurement. According to the theoretical approach, it appears that key theroretical issues are centered around customer service, logistics excellence, time compression, the use of IT, and a move towards integrated logistics. The empirical approach shows that in the past, various financial performance indicators were regarded as relevant management information. However, today, management needs additional performance indicators. Therefore, external assessments of effectiveness must be performed to measure customers' satisfaction with the physical flow of product through the distribution channel network. So, what is needed is to take previous normative and explorative research and progress through a framework by developing valid measures of distribution channel's effectiveness and efficiency, and identifying research methodologies suited to the data collection requirements.

• 제어로봇시스템학회:학술대회논문집
• /
• 2001.10a
• /
• pp.52.4-52
• /
• 2001

In this paper we propose a framework of an open architectured manufacturing system base on CORBA middleware. The manufacturing system consists of four configurable software modules 9mchine control module, database module, monitoring module, and operation module). Each module is distributed through the network and integrated with CORBA middleware technology. CORBA Characteristics including independence from programming languages, computing platforms and networking protocols makes us to easily develop new applications and to effectively integrate new module into existing distributed systems. The CORBA program used in this study is The ACE ORB (TAO) developed by the laboratory in Washington University.

• International Journal of Naval Architecture and Ocean Engineering
• /
• v.10 no.2
• /
• pp.225-234
• /
• 2018

A Multibeam Echo Sounder (MBES) is commonly used for rapid seafloor mapping. We herein present a time-domain integrated system simulation technique for MBES development. The Modeling and Simulation (M&S) modules consist of four parts: sensor array signal transmission, propagation and backscattering modeling in the ocean environment, beamforming of the received signals, and image processing. Also, the simulation employs a ray-theory-based algorithm to correct the reconstructed bathymetry, which has errors due to the refraction caused by the vertical sound velocity profile. The developed M&S technique enables design parameter verification and system parameter optimization for MBES. The framework of this technique can also be potentially used to characterize the seabed properties. Finally, typical seafloor images are presented and discussed.

• Annual Conference of KIPS
• /
• 2012.04a
• /
• pp.1091-1094
• /
• 2012

산업 및 무역, 유통 기업들은 수많은 물류자원이 된다. 이러한 기업들은 물류 비용을 절감하기 위해 전문 물류 기업에 물품 운송 부분을 맡긴다. 전문 물류 관리 기업들은 컴퓨터와 인터넷의 발전으로 공급자, 구매자와 타사 기업들간에 인터넷으로 서로 연결된다. 하지만 서로 다른 회사에서 사용하고 관리하는 소프트웨어 때문에 이기종데이터는 타사 기업을 위한 물류 정보시스템에 큰 문제가 된다. 따라서, 본 연구에서는 전문 물류 회사를 위한 도메인 온톨로지 기반의 검색 프레임워크를 제안한다. 제안한 도메인 온톨로지 기반의 검색 프레임워크는 통합 환경에서 전문 물류 회사를 위한 다양한 시스템과 프로세스를 포함한 문서로 제공될 수 있고 여러 다양한 문서의 통합 검색을 지원하며 문서 안의 의미 정보를 고려할 수 있다.

• Journal of information and communication convergence engineering
• /
• v.17 no.2
• /
• pp.117-127
• /
• 2019

In software engineering, to ensure reliability between systems, describing both system architecture and assurance arguments between system elements is considered necessary. There are proposals for system architecture assurance, but use of these traditional methods often requires development of different diagrams using different editors. Because the visual sense of the traditional methods is inadequate, errors readily occur when manipulating different diagrams. Therefore, it is essential that the assurance of dependability between components and systems is visualized and easy to understand. In this paper, an integrated approach to describe the relationship between system actors and system architecture is proposed, and this approach is clarified using an enterprise architecture modeling language. A case study is carried out and comparison to the traditional approach $d^*$ framework is explained. The comparison results show that the proposed approach is more suitable for ensuring dependability in system architecture.

• Annual Conference of KIPS
• /
• 2004.05a
• /
• pp.289-292
• /
• 2004

원자력발전소 MMIS(Man-Machine Interface System)는 발전소 공정과 관련 장비들을 감시 및 제어하고, 필요시에 보호기능을 수행함으로써 발전소를 안전하고 신뢰성 있게 운전할 수 있도록 지원하고 있다. 그러한 MMIS의 설계에 소프트웨어기반의 컴퓨터 기술이 사용된 경우, 그 설계를 구현하기 위해 사용된 소프트웨어가 설계 및 프로그래밍 오류에 취약하여, 공통유형의 소프트웨어 오류로 인해 하드웨어로써 구축된 다중성 설계를 파기시킬 수 있기 때문에 원자력 발전소의 안전 및 안정 운전과 직결되게 된다. 또한 소프트웨어는 설계공정 결함이 일반적으로 최종 결과물에서 확인될 수 있다는 점 때문에 확인 및 검증기술을 정립하고 체계적인 적용이 필수적이다. 이에 따라 본 논문에서는 현재 설계를 진행중인 SMART(System-integrated Modular Advanced ReacTor) MMIS 소프트웨어를 개발하기 위해 적용되는 확인 및 검증 규제요건을 분석하고, 소프트웨어 개발생명주기에 따른 확인 및 검증을 체계적으로 수행하기 위한 프레임웍을 제시한다.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.68 no.1
• /
• pp.189-198
• /
• 2019

In recent years, visual-inertial odometry(VIO) algorithms have been extensively studied for the indoor/urban environments because it is more robust to dynamic scenes and environment changes. In this paper, we propose loosely coupled(LC) VIO algorithm that utilizes the velocity vectors from both visual odometry(VO) and inertial measurement unit(IMU) as a filter measurement of Extended Kalman filter. Our approach improves the estimation performance of a filter without adding extra sensors while maintaining simple integration framework, which treats VO as a black box. For the VO algorithm, we employed a fundamental part of the ORB-SLAM, which uses ORB features. We performed an outdoor experiment using an RGB-D camera to evaluate the accuracy of the presented algorithm. Also, we evaluated our algorithm with the public dataset to compare with other visual navigation systems.

• Journal of Information Processing Systems
• /
• v.17 no.3
• /
• pp.441-452
• /
• 2021

Federated learning provides an efficient integrated model for distributed data, allowing the local training of different data. Meanwhile, the goal of multi-task learning is to simultaneously establish models for multiple related tasks, and to obtain the underlying main structure. However, traditional federated multi-task learning models not only have strict requirements for the data distribution, but also demand large amounts of calculation and have slow convergence, which hindered their promotion in many fields. In our work, we apply the rank constraint on weight vectors of the multi-task learning model to adaptively adjust the task's similarity learning, according to the distribution of federal node data. The proposed model has a general framework for solving optimal solutions, which can be used to deal with various data types. Experiments show that our model has achieved the best results in different dataset. Notably, our model can still obtain stable results in datasets with large distribution differences. In addition, compared with traditional federated multi-task learning models, our algorithm is able to converge on a local optimal solution within limited training iterations.

• International Journal of Computer Science & Network Security
• /
• v.21 no.1
• /
• pp.152-161
• /
• 2021

The paper focuses on Device-to-device (D2D) Architectures evaluation frameworks. D2D communication and discovery can improve spectrum usage efficiency and optimize the tradeoffs between throughput and energy consumption. The target operation modes involve both indirect communication between two nodes via a base station or the direct communication among proximal nodes, enabling use cases that can support communications out of cellular coverage, as well as low end-end delay requirements. The paper will present the architectural evolution of D2D networks within 3GPP standardization and will highlight key network functionalities and signaling protocols. It will also identify key analytical and simulation models that can be used to assess the performance and energy efficiency of resource allocation strategies, and it will present a suitable cross-layer integrated framework.