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김경섭,Yonghan Roh 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.3
A selective liquid phase deposition (LPD) of silicon dioxide was performed on a nanometer-scaled photoresist pattern fabricated by using an oxygen-plasma downstream-ashing technique. With the selective LPD method, silicon dioxide can be deposited at low temperatures under 50 C without thermal damage. Using the selective-liquid-phase-deposited silicon-dioxide layer as a wet etching mask, we could fabricate 600-nm-scale isolated structures. The LPD silicon dioxide showed excellent step coverage and good surface morphology. Moreover, the maximum capacitance value of the LPD silicon dioxide was 7 pF. The leakage current density of the LPD silicon dioxide was also very low, which indicated that the LPD silicon dioxide was a good insulating material for integrated circuit (IC). These results raise possibilities of fabricating new types of nanometer-scaled trenches and other nanometer-scale silicon-based devices.
김경섭,이정환,신승원,윤태호,이상민 대한전기학회 2006 전기학회논문지 D Vol.55 No.1(D)
- In this paper, we tried to implement a PDA (Personal Digital Assistant)-based audiometric system to test hearing disorder. Due to the inherent handy nature of PDA system, our hearing test system can be easily performed in an user's local environment and consequently the measured audiometric data can be stored and queryed locally via a built-in PDA database system.
김경섭,정석재,조영주 한국정밀공학회 2014 International Journal of Precision Engineering and Vol. No.
It is important to focus on greenhouse gas emissions from the steel industry because the iron and steel sector emits about 3.2% of the total greenhouse gases in the world. The present investigation examines the mitigation potential of future carbon dioxide reduction technology options in the iron and steel industry using a system dynamics approach. A system dynamics model is constructed based on energy, materials, and process flow: to analyze the carbon dioxide emission reduction technologies and energy use in iron and steel manufacturing processes. We analyzed steel manufacturers’ carbon dioxide emissions and the quantity of energy and materials consumed from coking and sintering, iron-making, continuous casting and rolling processes, and stainless processes. Six different carbon dioxide reduction technologies were introduced into the system in our model.
Magneto-caloric Properties of La0.7Ca0.3(Ni1−xMnx)O3 Compounds
김경섭,장영덕,유성초,강병섭 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.10
The magneto-caloric effect and magnetization behavior have been analyzed in the La<SUB>0.7</SUB>Ca<SUB>0.3</SUB>(Ni<SUB>1-x</SUB>Mn<SUB>x</SUB>)O<SUB>3</SUB> (x = 0.85, 0.88, 0.91, 0.94, 0.97, 1.00) compound. Samples were prepared by standard solid-state reaction in a stream of 5% H<SUB>2</SUB>/Ar gas. X-ray diffraction patterns revealed that all the samples are single phase in orthorhombic structure. The Curie temperature is increasing with increasing of Mn concentration from 175 K to 269 K. The values of magnetic entropy, Δ<I>S<SUB>M</SUB></I> are also increased with increasing of Mn content from 1.20 to 5.64 J/kg K. The enhancement of the magnetic entropy change is believed to be due to occurrence of the strong magnetic ordering between Mn-Mn atoms. The interesting features of this compound make it a competitive candidate for a working material in magnetic refrigeration application.
차량 사용자 인증 시스템을 위한 향상된 충돌 방지 알고리즘의 설계 및 구현
김경섭,이윤섭,최상방,Kim, Kyeong-Seob,Lee, Yun-Seob,Choi, Sang-Bang 한국정보통신학회 2013 한국정보통신학회논문지 Vol.17 No.1
최근 자동차 산업이 눈부시게 발전하면서 운전자의 편의성과 안전성을 위해 차량에는 끊임없이 새로운 시스템이 적용되고 있다. 이러한 시스템은 다수의 FOB 키를 사용하기 때문에 사용자 인증 시 원활한 다중 접속을 위해 충돌방지 알고리즘을 적용시켜 사용하고 있다. 본 논문에서는 다수의 FOB 키를 사용하는 차량용 스마트키 시스템에서 동적으로 사용자 아이디 요청 순서를 최근 사용자 아이디로 변경하여 차후 인증 과정에서의 통신 응답 소요 시간을 획기적으로 감소시키는 향상된 충돌방지 알고리즘을 설계하고 구현하였다. 향상된 충돌방지 알고리즘이 적용된 시스템의 성능 평가를 위해 차량에 실제 장착하여 구현된 알고리즘의 동작을 확인하였고, 다수의 FOB 키에 대한 통신 응답 소요 시간을 측정하였을 때 기존 알고리즘에 비해 약 33% 정도 감소되었음을 검증하였다. Because many of the FOB key, anti-collision algorithm for a seamless multi-access is applied to the smart-key system. In this paper, we have designed and implemented improved anti-collision algorithm that dramatically reduces the communication response time required in the user authentication process immediately after by dynamically changing the order in which the request of the user ID as the user ID on immediately before in the smart key system for vehicles that use many of the FOB key. In order to evaluate the performance of the system the improved anti-collision algorithm is applied, we show the behavior of the algorithm implemented in the state actually mounted on the vehicle and verify that communication response time required for many of the FOB key was reduced by about 33% compared to existing algorithms.