• Journal of Communications and Networks
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• 제3권4호
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• pp.317-323
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• 2001

Traditional configuration management involves complex labor-intensive processes performed by experts. The configuration tasks such as installing or reconfiguring a system, provisioning network services and allocating resources typically involve a large number of activities involving multiple network elements. The network elements may be associated with proprietary configuration management instrumentation and may also be spread across heterogeneous network domains thereby increasing the complexity of configuration management. This paper introduces an architecture for the self-configuration of networks (SELFCON). The proposed architecture involves a directory server, which is uses to maintain configuration information. The configuration information stared in the directory server is modeled using the standard DEN specification thereby allowing effective exchange of network, system and configuration management data among heterogeneous management domains. SELFCON associates configuration intelligence with the components of the network, rather than limit it to a centralized management station. The network elements are notified about related changes in configuration policies, based upon which, they perform self-configuration. SELFCON is able to provide automation of configuration management and also an effective unifying framework for enterprise management.

• Structural Engineering and Mechanics
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• 제64권5호
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• pp.591-610
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• 2017

This paper is concerned with the static analysis of variable thickness of two directional functionally graded porous materials (FGPM) circular plate resting on a gradient hybrid foundation (Horvath-Colasanti type) with friction force and subjected to compound mechanical loads (e.g., transverse, in-plane shear traction and concentrated force at the center of the plate).The governing state equations are derived in terms of displacements based on the 3D theory of elasticity, assuming the elastic coefficients of the plate material except the Poisson's ratio varying continuously throughout the thickness and radial directions according to an exponential function. These equations are solved semi-analytically by employing the state space method (SSM) and one-dimensional differential quadrature (DQ) rule to obtain the displacements and stress components of the FGPM plate. The effect of concentrated force at the center of the plate is approximated with the shear force, uniformly distributed over the inner boundary of a FGPM annular plate. In addition to verification study and convergence analysis, numerical results are displayed to show the effect of material heterogeneity indices, foundation stiffness coefficients, foundation gradient indices, loads ratio, thickness to radius ratio, compressibility, porosity and friction coefficient of the foundation on the static behavior of the plate. Finally, the responses of FG and FG porous material circular plates to compound mechanical loads are compared.

• Imaging Science in Dentistry
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• 제35권4호
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• pp.207-213
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• 2005

Purpose: To classify and describe the characteristic features of MRI of some ameloblastoma variants. Materials and Methods: The MR images, CT images, and panoramic radiographs in 5 cases were retrospectively examined as follows. First, the contents of ameloblastomas were devided into two portions of either solid or cystic components on the basis of MR signal intensities. The signal intensity within the solid or cystic portions was classified as homogeneous or heterogeneous. Next, the characteristic internal feature of the lesion on T1W1 or T2WI was described. The signal intensities were classified into low, intermediate, slightly high, high, and strong high signal intensity. Results: Unicystic lesion showed homogeneous high signal intensity (SI) on T2W2 and the rim enhancement of the surrounding area including the mural nodule and the thick wall except the central portion on Gd- T1W1. Solid type revealed heterogeneous and high SI area with strong high SI area on T2W2. On Gd- T1W1, the area corresponding to the low signal spot on T1W1 and the strong high signal spot on T2W1 showed low SI. Hybrid type showed slightly enhanced capsular structures and low SI for the round bony septa and the areas connecting the mixed and cystic lesions on T2Wl and Gd-T1W1. Conclusion: MRI could easily assess the relationship between the mixed and cystic findings in ameloblastoma.

• 한국해양공학회지
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• 제37권1호
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• pp.38-48
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• 2023

To maintain the existing systems of ships and introduce autonomous operation technology, it is necessary to improve situational awareness through the sensor fusion of the automatic identification system (AIS) and automatic radar plotting aid (ARPA), which are installed sensors. This study proposes an algorithm for determining whether AIS and ARPA signals are sent to the same ship in real time. To minimize the number of errors caused by the time series and abnormal phenomena of heterogeneous signals, a tracking method based on the combination of the unscented Kalman filter and probabilistic data association filter is performed on ARPA radar signals, and a position prediction method is applied to AIS signals. Especially, the proposed algorithm determines whether the signal is for the same vessel by comparing motion-related components among data of heterogeneous signals to which the corresponding method is applied. Finally, a measurement test is conducted on a training ship. In this process, the proposed algorithm is validated using the AIS and ARPA signal data received by the voyage data recorder for the same ship. In addition, the proposed algorithm is verified by comparing the test results with those obtained from raw data. Therefore, it is recommended to use a sensor fusion algorithm that considers the characteristics of sensors to improve the situational awareness accuracy of existing ship systems.

• 한국생산제조학회지
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• 제22권2호
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• pp.281-286
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• 2013

As the product lifecycle is getting shorter and various models should be released to respond to the needs of customers and markets, automation-based flexible production line has been recognized as the core competitiveness. According to these trends, system vendors supply cell-level systems such as FMC(Flexible Manufacturing Cell) that is integration of core functions of FMS(Flexible Manufacturing System) and RMC(Reconfigurable Manufacturing Cell) that can easily extend components of FMC. In the cell-based environment, flexible management for shop floor composed of existing job shop, FMCs and RMCs from various system vendors has emerged as an important issue. However, there could be some problems on integrated operation between heterogeneous cells to use vendor-specific cell controllers and on seamless information flow with high level systems such as ERP(Enterprise Resource Planning). In this context, this paper proposes process management systems supporting integrated shop operation of heterogeneous multi-cell based flexible manufacturing environment: First of all, (1) Integrated Shop Operation System to apply the process management system is introduced, and (2) Multi-Layer BOP(Bill-Of-Process) model, a backbone of the process management system, is derived with its data structure. Finally, application of the proposed model is illustrated through system implementation results.

• 생명과학회지
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• 제14권2호
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• pp.269-274
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• 2004

불균일상 촉매를 이용한 대두유와 메탄올간의 에스테르화 반응에 대하여 조사하였다. 온도 40∼$65^{\circ}C$에서 대두유와 메탄올 혼합물 내 성분 분배를 측정하였다. NaOH, CaO, Ca(OH)$_2$, MgO, Mg(OH)$_2$, and Ba(OH)$_2$과 같은 촉매에 대하여 반응 혼합물의 글리세린 함량을 측정하였다. 측정된 글리세린 농도로부터 반응 혼합물의 전화율을 계산하였다. 촉매 투여량, 보조용매 그리고 반응온도의 최종전화율에 대한 영향을 조사하였다. 대두유에 대한 메탄올의 용해도는 메탄올에 대한 대두유의 용해도보다 월등히 컸다. 대두유의 에스테르화 반응에 불균일상 촉매를 사용한 경우 최종전화율은 불균일상 촉매의 염기도에 크게 의존하였고, 촉매 금속의 염기도 증가에 따라 증가하였다. 알칼리 금속의 수산화물이 산화물 보다 효과적이었으며, 산화물은 촉매효과를 보이지 않았다. Ca(OH)$_2$를 에스테르화 반응의 촉매로 사용한 경우, 최종전화율의 최대값이 촉매 투여량 4%일 때 측정되었다. 최종전화율과 반응속도는 온도증가에 따라 증가하였으며 5$0^{\circ}C$에서 급격한 증가를 보였다. Ba(OH)$_2$를 촉매로 사용한 경우 보조용매로 HCl$_2$를 투여하면, 투여량 3%일 때 최종전화율의 최대값이 측정되었다.

• 한국공간정보시스템학회 논문지
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• 제1권2호
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• pp.33-46
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• 1999

CORBA와 같은 분산 컴퓨팅 환경에서 이종의 시스템 및 데이타베이스들의 통합을 위해 기존에는 포장자(wrapper)를 사용하였다. 이러한 여러 분야에 적용되는 포장자들 중에는 클라이언트에게 공통의 인터페이스를 제공하는 공간 데이타 제공자가 있다. 기존에는 공간 데이타 제공자를 데이타 소스별로 작성해야 하기 때문에 중복 구현과 구현 후의 변경 확장에 대한 문제가 있다. 이 논문에서는 공간 데이타 세공자의 재사용과 확장성을 위해 독립 포장자 객체와 종속 포장자 객체의 두개의 층으로 이루어진 새로운 구조를 제시한다. 종속 포장자 객체는 각 데이타소스에 대한 공간 데이타 작성시에 새로이 작성되야 하는 객체이고, 독립포장자 객체는 재사용될 수 있는 객체를 말한다. 또한 이 논문에서는 미들웨어에서 질의 처리 결과 유지 방법에 따른 구현 방법론을 제시한다. 질의 결과 유지 방법에는 질의 결과를 데이타로 유지하는 방법과 CORBA 객체로 변환하여 유지하는 방법으로 나뉘어진다. 각 방법에 대한 성능 평가 결과 CORBA 객체를 생성하는 방법의 비용이 상당히 높은 것을 알 수 있다.

• 한국멀티미디어학회논문지
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• 제9권10호
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• pp.1361-1370
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• 2006

최근 인터넷 기술의 빠른 발전은 웹 애플리케이션 관련 다양한 기술을 적극적으로 활용하는 방향으로 진화되고 있으며 다양한 장비들 간의 호환성 있는 정보 교환 소요도 급증하고 있다. 이러한 추세는 유비쿼터스 시대로의 진입에 따라 변화되는 부분들 중 일부라 할 수 있다. 본 논문은 다양한 클라이언트 유형들로 구성된 물류정보 시스템을 대상으로 상호간에 효과적으로 정보교환을 할 수 있는 계층구조를 지닌 컴포넌트의 설계 및 구현에 초점을 두었다. 설계 및 구현 시 재사용성과 확장성 증대를 위해 독립적 계층 구조 개념의 컴포넌트들을 제시 하였으며 클라이언트 간 상호 원활한 인터페이스를 위해 XML 웹 서비스 기능을 적용하였다. 설계 및 구현 시 다양한 시험을 통한 검증을 위해 RFID 입력 장치, PDA, 데스크 탑 등 다양한 유형의 클라이언트들을 적용 대상으로 하였으며 클라이언트 유형 및 플랫폼에 관계없이 정상적으로 작동됨을 확인하였다. 본 논문에서 구현된 컴포넌트는 향후 유사 업무를 개발 시 효과적으로 재사용될 수 있을 것이다.

• Carbon letters
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• 제6권1호
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• pp.31-40
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• 2005

The carbon nanofibers (CNFs) were synthesized through the catalytic decomposition of hydrocarbons in a quartz tube reactor. The CNFs prepared from $C_3H_8$ at $550^{\circ}C$ was selected as the purification sample due to the higher content of impurity than that prepared from other conditions. In this study, we carried out the purification of CNFs by oxidation in air or carbon dioxide after acid treatment, and investigated the influence of purification parameters such as kind of acid, concentration, oxidation time, and oxidation temperature on the structure of CNFs. The metal catalysts could be easily eliminated from the prepared CNFs by liquid phase purification with various acids and it was verified by ICP analysis, in which, for example, Ni content decreased from 2.51% to 0.18% with 8% nitric acid. However, the particulate carbon and heterogeneous fibers were not removed from the prepared CNFs by thermal oxidation in air and carbon dioxide. This result can be explained by that the direction of graphene sheet in CNFs is vertical to the fiber axis and the CNFs are oxidized at about the similar rate with the impurity carbon.

• Investigative Magnetic Resonance Imaging
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• 제19권1호
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• pp.56-61
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• 2015

Adenosarcoma of the uterus is a rare biphasic tumor containing benign glandular epithelial and malignant mesenchymal components. The tumor has been reported to be associated with antiestrogen therapy, particularly tamoxifen, but there have been a few case reports with MRI. We present two cases of MRI findings of uterine adenosarcoma after antiestrogen therapy, tamoxifen and toremifene in breast cancer patients. The tumor presents as a large polypoid mass occupying the endometrial cavity, and may protrude into the vagina. On MRI, the tumor typically shows solid components with scattered small cysts and heterogeneous enhancement. These findings are not significantly different from conventional adenosarcoma.