• 산업공학
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• 제20권4호
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• pp.547-559
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• 2007

In this paper, we design Real-Time Postal Logistics Operational Model and System as a to-be system. Current postal logistics information system, named PostNet, is a basic infra system designed for an end-to-end IT-driven process, from mail acceptance to delivery, linked with internal and external systems. Recent competing circumstances drive demand for more intelligent information system. So we design real-time postal logistics operational system focused on site operations. we analyze postal logistics operation and interview field workers and establish real-time postal logistics operational model to solve operational issues. Finally we suggest system specifications.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.532-535
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• 1999

In power cable joints, the interfaces of two different dielectric materials are inevitable. In addition, the interfacial breakdown between two internal dielectric surfaces represents one of the major causes of failure for power cable joints. We chose epoxy/EPDM interface, one of the interface in cable joints, and investigate dielectric interfacial breakdown phenomenon. First, design specimen with Flux 2D. Second, find interface condition which has high dielectric strength. Third, investigate interfacial breakdown properties with variable temperature.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2002년도 춘계학술대회 논문집
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• pp.516-521
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• 2002

According as railway signalling equipments are computerized recently, necessity of communication protocol for interface between these equipments is increasing, Therefore the research about communication protocol structure that is need according to computerization trend of these signalling goes, especially communication protocol structure for interface between LDTS(Local Data Transmission System) and EIS(Electronic Interlocking System). Analyzed existent protocols that is applied currently for interfaces between above two signalling for this research and also technology analysis of internal/external similar protocols and operator and maker's requirement. With these study finding plain in this paper, explained summary of communication protocol structure for interface between LDTS and EIS.

• 산업공학
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• 제7권3호
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• pp.213-225
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• 1994

For the implementation of CE(Concurrent Engineering), the TDMS(Technical Document Management System) which integrates design and manufacuring information, is required. In this paper a drawing information management system, one of the essential modules for the TDMS has been developed. The system is operated in SUN SPARC II workstations. A CAD software called CIMCAD-2D is used for the storage and management of drawings. Relational DBMS ORACLE is used for the development of information data bases concerned with drawings. As an integration tool, the multi-media software called LINKAGE is used. Various functions for drawings and concerned information have been developed with the internal language CIMSHELL and SQL $^*PLUS$.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 심포지엄 논문집 정보 및 제어부문
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• pp.68-70
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• 2004

In this paper we develop an adaptive interface between video compression and transission protocols to handle QoS fluctuations that are common to mobile communication systems. We consider various generic design alternatives for QoS adaptation and identify 'QoS negotiation' as the most promissing. This method gives the best possibilities to obtain system-wide efficiency. To handle the indued system complexity we apply a design philosophy (called ARC) that separates implementation dependencies by introducing QoS interfaces between system modules. In the ARC phlosophy the implementation details are hidden in the subsystems. To assure efficient adaptation, the QoS must be negotiated between modules. We select the QoS parameters that are both necessary and sufficient for efficient negotiation between the video encoder and protocol modules. We describe the relation between the QoS parameters at the interface and the internal parameters of common video coding methods and protocol elements. Furthermore, we describe a negotiation procedure that allows a system-wide optimum to emerge.

• 한국가시화정보학회:학술대회논문집
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• 한국가시화정보학회 2002년도 추계학술대회 논문집
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• pp.31-34
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• 2002

Imaging techniques using x-ray beam at high energies (>6KeV) such as contact radiography, projection microscopy, and tomography have been used to nondestructively discern internal structure of objects in material science, biology, and medicine. This paper introduces the x-ray micro-imaging method using 1B2 micro-probe line of PAL (Pohang Accelerator Laboratory). Cross-sectional information on low electron density materials can be obtained by probing a sample with coherent synchrotron x-ray beam in an in-line holography setup. Living organism such as plants, insects are practically transparent to high energy x-rays and create phase shift images of x-ray wave front. X-ray micro-images of micro-bubbles of $20\~120\;{\mu}m$ diameter in an opaque tube were recorded. Clear phase contrast images were obtained at Interfaces between bubbles and surrounding liquid due to different decrements of refractive index.

• 한국화재소방학회:학술대회논문집
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• 한국화재소방학회 1997년도 International Symposium on Fire Science and Technology
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• pp.11-18
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• 1997

Fire safety systems in large buildings are likely to be complex and may be designed independently of other systems. This means that the interactions and interfaces between the fire safety systems and between the environmental control systems and the fire safety systems may not be carried out properly. Many large, recent buildings have many technological component systems that are used for the control of the environment within the building. Because of the "special" nature of the fire safety systems there is little consideration is given to the possibility systems with a dual function. However, many of the functions of fire safety systems are extensions of systems that provide the day to day control over the internal environment. The present world-wide trend towards the establishment of performance codes, and regulations, will enable the functional design of all systems and thereby allow closer integration of the "ordinary" and "special" systems. Some aspects of the functional and performance characteristics of systems in buildings are introduced and discussed. Special reference is made to the contributions of the systems to the minimisation of fire damage.e minimisation of fire damage.

• Nuclear Engineering and Technology
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• 제51권4호
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• pp.996-1007
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• 2019

We investigated the influence of the aspect ratio (H/R) of the oxide layer on the reactor vessel heating in three-layer configuration. Based on the analogy between heat and mass transfers, we performed mass transfer experiments to achieve high Rayleigh numbers ranging from $6.70{\times}10^{10}$ to $7.84{\times}10^{12}$. Two-dimensional (2-D) semi-circular apparatuses having the internal heat source were used whose surfaces of top, bottom and side simulate the interfaces of the oxide layer with the light metal layer, the heavy metal layer, and the reactor vessel, respectively. Multi-cell flow pattern was identified when the H/R was reduced to 0.47 or less, which promoted the downward heat transfer from the oxide layer and possibly mitigated the focusing effect at the upper metallic layer. The top boundary condition greatly affected the natural convection of the oxide layer due to the presence of secondary flows underneath the cold light metal layer.

• Composites Research
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• 제13권6호
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• pp.23-29
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• 2000

층상구조재료가 갖는 약점으로는 구성재료층 간의 열.기계적 특성 차이로 인하여 내부응력이 발생되고 비틀림 변형이 유발되어 형상 제어가 매우 어려울 뿐만 아니라, 반복적인 열 하중으로 인해 열이력을 받을 경우 접합부에서의 파손이 생길 수 있다는 것이다. 최근 층상구조에서 조직 혹은 조성이 점차적으로 변하는 계면을 삽입한 경사조성재료는 열.기계적 변형특성 차이에 의한 재료의 손상을 최소화시킬 수 있으나, 용도에 적합한 구조설계를 위해서 열.기계적 해석이 필요하다. 본 연구에서는 전자패키징용 $Al-SiC_p$ 경사조성 복합재료의 기하학적 구조와 온도변화에 따른 곡면화 변형 및 내부응력분포를 해석하고자 하였다. 한편 층상구조 $Al-SiC_p$ 경사조성 복합재료의 열변형량을 측정하고 내부응력분포를 실험적으로 구하여, 이론적으로 계산한 결과와 비교하였다. 본 연구의 해석결과는 경사조성 층상구조재료의 최적구조 설계에 유용하게 적용할 수 있다.

• 정보보호학회논문지
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• 제21권4호
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• pp.101-114
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• 2011

산업스파이 및 악의적인 내부 이용자에 의한 기업 내부 핵심 정보유출 사건이 증대되고 있는 현실을 반영하듯, 감사 및 로그 보안기술의 중요성이 한층 부각되고 있는 것이 현실이다. 본 논문에서는 기업의 중요 정보를 처리하는 운영체제에 접속한 사용자에 대한 행위를 면밀히 감시 및 분석하여, SOX 법안에서 요구하는 수준의 기업 내부통제를 위한 세션로깅시스템을 제안한다. 본 논문에서 제안하는 시스템은 운영체제에 접속한 사용자의 불법적인 행위를 모니터링하고, 그 행위 과정의 세부 로그를 통해 명확한 증거를 제시할 수 있도록 하고 있다. 이를 위해 논문에서 제안한 별도의 여러 서비스를 추가하여 운영체제를 변경하는데, 이러한 서비스는 기존의 운영체제가 제공하는 인터페이스를 이용하면서 접근을 제어하고 로그를 획득하기 위한 기능을 추가적으로 제공한다. 서버에 접속한 관리자 및 사용자의 행위에 대한 세션 로그를 중앙 집중적으로 저장, 관리하고 해당 로그에 대한 검색 및 조회 기능을 제공할 수 있도록 하여, SOX 법안에서 요구하는 수준의 기업 내부통제를 위한 컴퓨터 포렌식 시스템 및 로그 기술을 제안한다.