• 한국자동차공학회논문집
• /
• 제20권2호
• /
• pp.8-14
• /
• 2012

"Throttle-by-Wire" is an electronic throttle system in which mechanical cables and hydraulics are replaced by a fieldbus network, electric motors and sensors. It is crucial for an electronic throttle to design a controller that can offer an accurate and fast reference tracking performance in the presence of nonlinearities, such as friction in the gearbox and "limp-home" nonlinearity. This paper presents a nonlinear dynamic inversion based control algorithm for electronic throttle systems. Using the proposed method, the specified control performance can be achieved by canceling inherent nonlinear characteristics of the electronic throttle system. The control performance is investigated through a set of simulation results.

• 인터넷정보학회논문지
• /
• 제6권2호
• /
• pp.153-163
• /
• 2005

본 논문에서는 통합적으로 상품 정보를 처리할 수 있는 전자 카탈로그 문서 구조를 정의하고 다양한 카탈로그 문서 포맷 및 구조를 지원하기 위하여 전자 카탈로그 표준 포맷을 XML(eXtensible Morkup Language)로 제안하였다. 또한, 거래에 참여하는 사용자가 정의된 전자 카탈로그 문서를 전자 상거래에 이용할 수 있도록 통합형 전자 카탈로그 시스템을 설계 및 구현하였다. 본 시스템은 웹 서비스와의 연동을 통하여 웹 서비스가 가지고 있는 비즈니스 통합 및 상호 운용성 등 다양한 장점과 전자 카탈로그 문서에서 얻을 수 없는 유용한 정보들을 웹 서비스를 통하여 얻을 수 있도록 하였다.

• Transactions on Electrical and Electronic Materials
• /
• 제5권5호
• /
• pp.185-188
• /
• 2004

Phase transitions from the amorphous to crystalline states, and vice versa, of GST(GeSbTe) and AST(AsSbTe) thin films by applying electrical pulses have been studied. These materials can be used as nonvolatile memory devices. The thickness of ternary chalcogenide thin films is approximately 100 nm. Upper and lower electrodes were made of AI. I-V characteristics after impressing the variable pulses to GST and AST films. Tc(crystallization temperature) of AST system is lower than that of the GST system, so that the current pulse width of crystallization process can be decreased.

• Transactions on Electrical and Electronic Materials
• /
• 제9권3호
• /
• pp.110-115
• /
• 2008

In this paper, we have designated a 42-inch RGB LED BLU, 80 % above illuminance. A desirable brightness performance was attained, by doing anti-parallel configuration, a fitting of LED's strip distance and a height of the top of LED to the back of the LCD. We get the 85.81 % of the brightness uniformity which has 12.8 mm away from LED's top and LCD's back and 51.41 mm of the same spacing between LED's strip in simulation and 82.24 % in experiment.

• 한국정보처리학회논문지
• /
• 제7권5S호
• /
• pp.1638-1648
• /
• 2000

Electronic commerce using internet is rapidly increasing a method to introduce and sell goods. persons who buy products in electronic commerce prefer to make interactive communications by multi users about products rather than show product informations. Reserved interactive transaction system for electronic commerce is electronic commerce system that is able to make a real communication buyers and customers. In this paper, e intend to design and implement reserved interactive transaction system for electronic commerce. it is efficiently used in middle and samll transaction system and able to make similar applications to sell and negotiate products for commercial transaction.

• Transactions on Electrical and Electronic Materials
• /
• 제5권6호
• /
• pp.241-243
• /
• 2004

The phase transition between amorphous and crystalline states in chalcogenide semiconductor films can be controlled by electrical or pulsed laser beam; hence some chalcogenide semiconductor films can be applied to electrically write/erase nonvolatile memory devices, where the low conductive amorphous state and the high conductive crystalline state are assigned to binary states. In this letter, the characteristics of phase transition in differential chalcogenide thin film are investigated. Al was used for the electrode as the thickness of 100, 300, 500 nm, respectively.

• Transactions on Electrical and Electronic Materials
• /
• 제8권4호
• /
• pp.178-181
• /
• 2007

We have designed high performance prism light-guide plate (LGP) in 17 inch TFT-LCD. In test result to embody high brightness BLU in case of LGP of base and upper surface with 17 inch, thickness 8 mm adding prism construct, it is superior brightness improvement than previous that of printing form about some 20% and in this course to embody actual material it succeeded prism LGP production by 17 inch injection form process.

• Transactions on Electrical and Electronic Materials
• /
• 제15권1호
• /
• pp.1-6
• /
• 2014

Self-exciting electronic ballast, of small size, and low cost, and high power, with no stroboscopic effect, no noise, is widely used in the general lighting market. This paper describes the cause of high switching loss of self-exciting electronic ballast, based on its operational principle; then, to reduce the switch temperature and increase the reliability of the product, the drive circuit has been improved, to achieve soft-switching. The theory analysis, simulation and experimental result prove the feasibility and compatibility of this new method in practice. Finally, the design procedure and winding method of the self-exciting current transformer are introduced.

• 전력전자학회논문지
• /
• 제25권6호
• /
• pp.503-510
• /
• 2020

The importance of DC breakers as key protection equipment is increasing in accordance with growing concerns on MVDC distribution network systems without DC/AC conversion. Different from the situation in AC systems, no natural zero-crossing point exists in DC systems. Thus, DC breaker technology is more difficult than AC breaker technology. The solutions for DC breakers can be divided into three types: mechanical, power electronics, and hybrid. In this study, the operating principles of several topologies of hybrid circuit breakers and that of the proposed DC breaker are analyzed and simulated by sorting two types. The breakers are compared in terms of the type and number of semiconductors, volume, power loss, auxiliary components, isolation, and other aspects. The advantages and disadvantages of the breakers are also analyzed.

• 무역상무연구
• /
• 제19권
• /
• pp.119-138
• /
• 2003

ICC(International Chamber of Commerce) developed new rule on the presentation of electronic record in L/C transactions. This rule named as the e-UCP. The gists of this article are on the application of e-UCP in practice and it's some problems. The e-UCP is the supplement of current exisiting UCP but is superior to UCP under some circumstances. The e-UCP is only apply to the presentation of electronic record regardless of type of L/C(for example, traditional paper L/C or electronic L/C). The presentation of electronic record has some problems which has not seen in the presentation of paper document. These peblems are Time, Place of presentation, and format of electronic record and so on. The e-UCP provided on the basis of these problems. However, the e-UCP has some obscure provisions on the examination of electronic record and the corruption of electronic record. Who is responsible for the corruption of electronic record by the virus on the system of bank ? The current e-UCP is not clear on this matter. We have to note followings in case of presenting the documents electronically and applying the e-UCP. First, Beneficiary has additional duty to notice of completion of presentation. Second, It will be increasing the clean NEGO through prompt feedback of the descrepancy at the presenting time. Third, It is no use of L/G(Letter of Guarantee).