• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.483-490
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• 2016

Automobile door latch is a fine design and assembly techniques are required in order to produce them in a small component assembly shape such as a spring, injection products, a small-sized motor. The door latch is fixed to not open the door of the car plays an important role it has a direct impact on the driver's safety. In this study, during trimming of the terminals of the connector main components of the car door latch, reduce rollover and conducted a research to find a suitable effective shear surface. Using the Taguchi method with orthogonal array of Finite Element Analysis and optimal Design of Experiments were set up parameters for the shear surface quality of the car door latch connector terminals. The design parameters used in the analysis is the clearance, the radius, and the blank holding force, the material of the connector terminal is a C2600. Trimming process optimum conditions suggested by the analysis has been verified by experiments, the shear surface shape and dimensions of a final product in good agreement with forming analysis results.Taguchi method from the above results in the optimization for the final rollover and effective shear surface improved for a vehicle door latch to the connector terminal can be seen that the applicable and useful for a variety of metal forming processes other than the trimming process is determined to be applicable.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.35 no.6
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• pp.1277-1285
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• 2015

It has been known that the conventional retaining wall system with timber lagging and H pile has several problems such as the irregular gap between H-piles, cutting or adding to standard timber, back fill over first step excavation, and especially break-down accident at the disjoint of wall system. In the practical excavation, these problems may lead to worker's accident and the inefficiency of construction economy. To solve the above problems, a new method using prefabricated retaining wall was proposed and verified. The characteristics of the new method is to replace timber wall as free-sliding steel-lagging and connector. To check its verification and application, laboratory tests such as bending strength, tensile strength, and fatigue strength were carried out. Also, a pilot test in the field and numerical simulations under various ground conditions were performed. From the researches, it is found that the prefabricated retaining wall plate can be superior to the conventional timber lagging plate in the strength. It is also found that the proposed methods can be effective in the reuse of retaining wall plate and safe in the disjoint of wall system. Finally, it is desired that the proposed method will be effective in the reduction of the imported timbers and helpful in the safety of retaining wall construction.

• Journal of Korean Society of Transportation
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• v.27 no.2
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• pp.15-22
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• 2009

There exist some limits when we forecast urban railway demand by traditional 4 step model. The first reason is that the model based on socioeconomic data by an administrative unit, 'Dong', yields a 'Dong' unit trip matrix. But a 'Dong' often has two or more stations. The second reason is that urban railway demand by station would be affected rather by station access area on foot than by a 'Dong' unit. So the model based on 'Dong' characteristic data have some inaccuracies in itself. Owing to the limits of the model based on 'Dong' unit data, there exits some difficulty in forecasting urban railway demand by station. So this paper studied two alternatives. The first is to forecast the demand by using the data of station access area on foot rather than 'Dong' unit data. This needs too much time and effort to collect data and analyse them, while the accuracy of the model didn't improve a lot. The second is to adjust the location of 'Dong' centroid and the length of centroid connector link. By this way we can reflect the characteristics of station access area on foot under traditional 4 step model. Comparing the expected demand to the observed data for each station, the result looks like very similar.

• Journal of KIISE:Software and Applications
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• v.29 no.7
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• pp.436-449
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• 2002

This paper describes on our experience of developing the Database Connector as an interconnection method between multimedia database, and the streaming framework. It is possible to support diverse and mature multimedia database services such as retrieval and join operation during the streaming if an interconnection method is provided in between streaming system and multimedia databases. The currently available interconnection schemes, however have mainly used the file systems or the relational databases that are Implemented with separated form of meta data, which deafs with information of multimedia contents, and streaming data which deals with multimedia data itself. Consequently, existing interconnection mechanisms could not come up with many virtues of multimedia database services during the streaming operation. In order to resolve these drawbacks, we propose a novel scheme for an interconnection between streaming framework and multimedia database, called the Inter-Process Communication (IPC) based Database connector, under the assumption that two systems are located in a same host. We define four transaction primitives; Read, Write, Find, Play, as well as define the interface for transactions that are implemented based on the plug-in, which in consequence can extend to other multimedia databases that will come for some later years. Our simulation study show that performance of the proposed IPC based interconnection scheme is not much far behind compared with that of file systems.

• Journal of KIISE:Software and Applications
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• v.36 no.4
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• pp.261-272
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• 2009

The EJB 3.0 specifications, which were improved in terms of performance and ease of development, were recently announced. Accordingly, for the EJB 3.0 application environment, developers generally prefer the gradual transformation of components whose performance must be improved to the complete transformation of all the EJB 2.1 components into EJB 3.0 components. Previous studies, however, did not consider the service of the application and did not ensure the compatibility and reusability of the components in the full replacement of EJB 3.0 due to the transformation using different specifications. This study proposed three transformation techniques that consider the service supported in the existing application, wherein the compatibility and reusability of the components are ensured in the case of the full replacement of EJB 3.0. The proposed transformation techniques are techniques for gradual transformation, such as direct transformation that directly connects components, indirect transformation that uses the EJB connector, and indirect template transformation wherein the template pattern is applied to the indirect transformation. The proposed transformation techniques were verified by comparing the reusability and processing capability of the components per second, and the standards for selecting a technique were provided based on the characteristics of the transformation into EJB 3.0 that were found in this study.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.214-216
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• 2017

컴퓨터 기술이 발전하면서 현대사회에서의 정보의 중요도와 의존도가 나날이 증가하고 있다. 정보가 중요해진 만큼 해킹 기술도 다양하고 예측하기 어렵게 만들어지면서 정보사회가 위협받고 있다. 이와 관련된 기술을 이스라엘의 벤구리온대학 내의 사이버보안 연구센터에서 연구했다. 2014년에 개발한 Airhopper는 디스플레이 어댑터에서 출력 시 나오는 주파수를 이용해 데이터를 변조해서 휴대폰으로 수신 할 수 있도록 정보를 추출하는 공격이고, 2016년에 개발한 USBee는 USB 2.0 커넥터를 이용한 장비를 통해서 USB 데이터 와이어를 조작해 특정 주파수를 만들어 무선망을 구축하고 데이터를 추출해 내는 공격이다. 본 논문에서는 이 Airhopper와 USBee 기술을 이용한 사이버 공격 시나리오를 추출하고 이에 대한 예방 및 대응 방안을 제시한다.

• Journal of KIISE:Databases
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• v.27 no.4
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• pp.613-626
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• 2000

전통적인 워크플로우 패러다임에 있어서는 하나의 워크플로우가 자동으로 실행되기 위해서는 사전에 해당 워크플로우 탬플릿이 정의되어야 한다. 하지만 많은 경우에 있어서 프로세스 생성시에 전체 워크플로우를 명확하게 정의 할 수 없는 상황이 발생한다. 그러한 경우에는 워크플로우 파편을 통합하여 유도되는 것이 적절하다. 워크플로우 관리시스템이 그러한 상황에 대처하기 위해서는 실행 중에 워크플로우를 정의하는 기능을 갖출 필요가 있다. 본 논문에서는 워크플로우 관리시스템에서 실행 중 워크플로우 정의 기능을 어떻게 수용할 것인지에 관해서 소개하고 그러한 기능을 수용하는 워크플로우 관리 시스템이 어떠한 구조이어야 하는지에 관해서 논의한다. 본 논문에서는 또한 실행 중 워크플로우 정의를 위한 세가지 워크플로우 파편 템플릿이 소개되며 이것들로부터 전체 워크플로우를 유도하는 알고리즘이 고안되었다. 실행 중 워크플로우 정의 기능을 구현하기 위해서는 커넥터 메커니즘이 고안되었으며 이것의 구조와 기능도 소개된다.

• The KIPS Transactions:PartC
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• v.8C no.4
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• pp.415-420
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• 2001

VLSI 기술의 빠른 발전으로 디지털 시스템의 동작주파수가 높아짐에 따라 고속 통신시스템 의 하드웨어 설계 시 신호 무결성을 고려한 설계가 필수적이다. 디지털시스템에서의 잡음원 은 전송선에서의 전원장치, 접지 바운스, 실장 재료 등에 관련된다. 본 연구에서는 고속네트 워크/통신시스템의 기가비트 연결 설계기술에 필요한 요소들을 언급하였고, 실제 설계 신호 불연속에 영향을 미치는 커넥터의 누화 및 전송선의 표피 효과, 유전손실 등을 고려한 백플 레인보드를 시뮬레이션 하였다.

• Fire Science and Engineering
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• v.22 no.2
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• pp.84-90
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• 2008

This paper aims to experimentally investigate the in-fire performance of composite beams with respect to the effects of load ratio and shear interaction. Under a Standard ISO834 fire, the development of temperature and deflection of simply supported composite beams were recorded. In particular, the transition of temperature distribution across the cross-section. The fire resistance of composite beam was interpreted regarding the level of shear interaction.

• 한국정보통신설비학회:학술대회논문집
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• 2005.08a
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• pp.35-37
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• 2005

본 논문은 FTTH 의 본격적인 사업에 앞서 순수한 광선희망에서의 반사손실의 영향을 파악하고 문제점 도출 및 해결방안을 찾고자 시스템적인 요소를 제외하고 시험을 하였다. E-PON 광선로망의 반사손실 측정값을 위하여 1 단분기(1*32)에서의 SC/PC, SC/APC, 2 단분기(1*4/1*8)에서의 SC/PC, SC/APC 의 4 가지 형태로 구성하여 측정하였고 SC/PC 커넥터 사용시 단자내가입자단의 공기중에 노출되는 채널수가 많을수록 일정한 패턴을 보이며 반사손실 특성이 저하되었다.