• 한국음향학회지
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• 제23권8호
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• pp.590-596
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• 2004

본 논문에서는 한국어 연결 숫자음 인식을 위한 최대 사후 eigenvoice을 사용한 자기적응 기법을 제안한다. 제안된 최대 사후 eigenvoice 기법은 eigenvoice 계수에 대한 확률 밀도 함수를 가정함으로 구성된다. 제안된 알고리즘은 기존 eigenvoice 추정 과정에 선 분포 모델을 포함하는 일반적인 해를 제공하는 구조를 갖는다. 인식할 한 문장만을 사용하는 자기 적응 시스템을 위해 매우 강인한 특성을 갖는 최대 사후 eigenvoice 적응 기법을 사용하였다. 한국어 연결 숫자음에 대한 일련의 자기 적응 실험결과 제안된 알고리즘의 성능은 매우 적은 량의 적응 데이터에 대해 기존 eigenvoice 알고리즘에 비해 우수한 성능을 나타냈었다.

• 디지털산업정보학회논문지
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• 제11권1호
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• pp.27-35
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• 2015

Increasing the number of GPU (Graphic Processor Unit) cores, the studies on High Performance Computing Platform using GPU have actively been made in recent. This trend has led to the development of GPGPU (General Purpose GPU) and CUDA (Compute Unified Device Architecture) Framework. In this paper, we explain the many benefits of the GPU based system, and propose the ICIDF(Identify Compute-Intensive Data set and Function) methodology to apply GPU technology to legacy military information system for performance improvement. To demonstrate the efficiency of this methodology, we applied this method to AES CPU based program obtained from the Internet web site. Simply changing the data structure made improved the performance of AES program. As a result, the performance of AES based GPU program is improved gradually up to 10 times. Depending on the developer's ability, additional performance improvement can be expected. The problem to be solved is heat issue, but this problem has been much improved by the development of the cooling technology.

• 인터넷정보학회논문지
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• 제5권3호
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• pp.87-98
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• 2004

일반 가입자들에게 초고속 인터넷 서비스를 제공하기 위해서 구성되는 가입자 망은ADSL, VDSL, DOCSIS 등 다양한 종류의 접속방식과 그에 따른 이기종(이기종)의 장비들로 이루어져 있다. 이러한 가입자 망은 전국적으로 분산되어 있으며, 분산된 가입자 망은 효과적이며 집중화된 형태로 관리하기 위해서는 다양한 형태의 접속방식을 지원하는 이기종 장비 및 단말들의 상위 개념으로서 추상적이며 논리적인 객체 관리모델이 필요하다. 본 논문은 통합된 계층적 망관리를 가능하게 하는 인터넷 가입자 망에 대한 모델링 구조론 RM-ODP흘 이용하여 제시하였다. 그리고 가입자 망의 예로서 UML을 이용한 객체지향 방법론을 채택하여 DOCSIS의 HFC 가입자망에 대한 관리 시스템을 설계하고 구현하였다.

• Journal of Electrical Engineering and Technology
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• 제10권3호
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• pp.888-894
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• 2015

This paper presents a unified model based assessment framework to quantify threats and vulnerabilities associated with control systems, especially in the SCADA (Supervisory Control and Data Acquisition) system. In the past, this system was primarily utilized as an isolated facility on a local basis, and then it started to be integrated with wide-area networks as the communication technology would make rapid progress. The introduction of smart grid, which is an innovative application of digital processing and communications to the power grid, might lead to more and more cyber threats originated from IT systems. However, an up-to-date power system often requires the real-time operations, which clearly implies that the cyber security would turn out to be a complicated but also crucial issue for the power system. In short, the purpose of this paper is to streamline a comprehensive approach to prioritizing cyber security risks which are expressed by the combination of threats, vulnerabilities, and values in the SCADA components.

• Journal of Computing Science and Engineering
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• 제2권4호
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• pp.375-393
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• 2008

The dynamic cast operation allows flexibility in the design and use of data management facilities in object-oriented programs. Dynamic cast has an important role in the implementation of the Data Management Services (DMS) of the Mission Data System Project (MDS), the Jet Propulsion Laboratory's experimental work for providing a state-based and goal-oriented unified architecture for testing and development of mission software. DMS is responsible for the storage and transport of control and scientific data in a remote autonomous spacecraft. Like similar operators in other languages, the C++ dynamic cast operator does not provide the timing guarantees needed for hard real-time embedded systems. In a recent study, Gibbs and Stroustrup (G&S) devised a dynamic cast implementation strategy that guarantees fast constant-time performance. This paper presents the definition and application of a cosimulation framework to formally verify and evaluate the G&S fast dynamic casting scheme and its applicability in the Mission Data System DMS application. We describe the systematic process of model-based simulation and analysis that has led to performance improvement of the G&S algorithm's heuristics by about a factor of 2. In this work we introduce and apply a library for extracting semantic information from C++ source code that helps us deliver a practical and verifiable implementation of the fast dynamic casting algorithm.

• 한국CDE학회논문집
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• 제10권2호
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• pp.133-142
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• 2005

This paper proposes an object-oriented conceptual information model of mechanical assemblies, named open assembly model (OAM). The proposed assembly model primarily defines hierarchical relationships between parts and subassemblies. Together with the assembly hierarchy. the model also provides a way to represent tolerances, kinematic information, and parametric assembly constraints. Relational information such as mating conditions and degree of freedom between parts and subassemblies is captured via assembly features and relationships thereof. The information model is described using class diagrams of the Unified Modeling Language (UML), and instance diagrams are used to exemplify the proposed information model. The conceptual model presented in this paper is an integrated information model for assembly representation, which could supply necessary information for tolerance analysis and synthesis, kinematic simulation, and assembly simulation. Such a conceptual information model plays an important role for the exchange of information between modeling, analysis and planning systems. Hence, the proposed model could serve as a framework for developing data exchange standards of mechanical assemblies. The proposed model is demonstrated through a case study of a planetary gear assembly.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2012년도 추계학술대회
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• pp.487-490
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• 2012

세계가 하나의 경제로 통합화되고 있는 상황에서 우리나라가 선진국과의 경쟁에서 경쟁력을 유지하기 위해서는, 기술 개발을 통한 필수특허 창출은 물론이고 이를 국제표준에 반영하는 노력을 기울여야 한다. 특히, 기술개발과 연계한 효율적인 표준화도 중요하지만, 중장기 기술 기획 시 표준화를 고려한 기획의 중요성이 커지고 있다. 따라서 본 논문에서는 국내 정보통신 관련 기술기획 및 표준화 기획 분야의 사례를 분석하여 기술기획에 기반한 효과적인 표준화 기획 체계를 제시하여 국내 개발기술의 국제 표준화를 촉진하고 표준화 활동의 초석을 마련하는 것을 목적으로 한다.

• Journal of Computing Science and Engineering
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• 제6권1호
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• pp.60-66
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• 2012

It has been proved that information and communication technology (ICT) solutions for personalized health (PHealth) and ambient assisted living (AAL) can support people in their daily life activities. Several solutions have been demonstrated to empower different levels of services through seamless data acquisition and specific users' interaction modalities. Usually services usability and accessibility are handled in the design process and are validated with small users' groups. Moreover, while service design and systems development have been extensively described in literature, service deployment methodologies are not properly addressed and documented. Proper reference guidelines are also missing. The most common methodologies like unified process (UP) or ICONX can cover only the design and the development of PHealth services without a clear description on the following phases such as deployment, service provision and maintenance. These phases present several risks to be taken into account right from the beginning of the implementation of PHealth or AAL services. This paper focuses on the description of a structured methodology to deploy PHealth services and how this process can be supported by integrated software routines and adapting the UP framework in particular the "Transition phase."

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제11권9호
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• pp.4438-4460
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• 2017

The Kernelized Correlation Filters (KCF) tracker has caused the extensive concern in recent years because of the high efficiency. Numerous improvements have been made successively. However, due to the abrupt motion between the consecutive image frames, these methods cannot track object well. To cope with the problem, we propose an extended KCF tracker based on swarm intelligence method. Unlike existing KCF-based trackers, we firstly introduce a swarm-based sampling method to KCF tracker and design a unified framework to track smooth or abrupt motion simultaneously. Secondly, we propose a global motion estimation method, where the exploration factor is constructed to search the whole state space so as to adapt abrupt motion. Finally, we give an adaptive threshold in light of confidence map, which ensures the accuracy of the motion estimation strategy. Extensive experimental results in both quantitative and qualitative measures demonstrate the effectiveness of our proposed method in tracking abrupt motion.

• 한국정보과학회논문지:소프트웨어및응용
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• 제26권4호
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• pp.533-545
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• 1999

절차적 재사용, 객체지향 사용, 디자인 패턴, 분석 패턴, 그리고 프레임 워크와 같은 효율적인 소프트웨어 재상요에 대한 많은 연구가 진행되어 오고 있다. 최근 들어 객체지향 프레임워크가 효율적이고 실용적인 재사용 기법으로 크게 부각되고 있다. 객체지향 프레임워크는 특정 도메인에 대한 여러 어플리케이션들 간의 공통된 행위들을 지닌 클래스들의 집합으로서, 재사용성을 증가시키고, 어플리케이션 개발시간을 단축시키는 효과를 지니고 있다. 그러나, 객체지향 프레임워크를 구축하기 위한 체계적인 개발 프로세스와 세부적인 개발 지침에 대한 연구가 충분히 이루어지지 않은 상태이며 OMG의 Unified Modeling Kanguage (UML)을 이용한 객체지향 프레임워크 개발에 관한 연구도 매우 미흡한 상태이다. 본 논문에서는 UML 문법과 의미를 기반으로 한 실용적인 객체지향 프레임워크 모델링 기법을 제시한다. 제시된 모델링 기법의 프로세스는 분석, 설계 구현, 그리고 시험 4단계(Phase)로 구성되어 있으며 , 각 단계는 논리적인 개발 업무(Task)들로 정의된다. 제시된 프로세스는 UML 다이어그램들을 적용 및 확장하였고, Objectory 프로세스를 바탕으로 한 것이므로 , 제시된 프로세스의 적용성 검증을 위해 전자 상거래 도메인에 대한 적용사례연구를 제시한다.