• Journal of the Korean Institute of Telematics and Electronics
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• v.25 no.5
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• pp.509-521
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• 1988

In the designs of integrated circuits, the buffer circuits used for driving a large capacitive load from minimum-structured logic circuit outputs have important effects upon system throughputs. Therefore it is important to optimize the buffer circuits. In this paper, the principle of designing CMOS buffer circuits which have the minimum delay and drive the given capacitive load is discussed. That is, the effects of load capacitance upon rise time, fall time, and delay of the CMOS inverter and the effects of parasitic capacitances are finely analysed to calculate the requested minimum-delay CMOS buffer condition. This is different from the method by C.A. Mead et. al.[2.3.4.]which deals with passive-load-nMOS buffers. Large channel width MOS transistor stages are necessary to drive a large capacitive load. The effects of polysilicon gate resistances of such large stages upon delay are also analysed.And, the area of buffer circuits designed by the proposed method is smaller than that of buffer circuits designed by C.A. Mead's method.

• ETRI Journal
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• v.27 no.5
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• pp.585-594
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• 2005

A small electronic nose (E-Nose) system has been developed using an 8-channel vapor detection array and personal digital assistant (PDA). The sensor array chip, integrated on a single microheater-embedded polyimide substrate, was made of carbon black-polymer composites with different kinds of polymers and plasticizers. We have successfully classified various volatile organic compounds such as methanol, ethanol, i-propanol, benzene, toluene, n-hexane, n-heptane, and c-hexane with the aid of the sensor array chip, and have evaluated the resolution factors among them, quantitatively. To achieve a PDA-based E-Nose system, we have also elaborated small sensor-interrogating circuits, simple vapor delivery components, and data acquisition and processing programs. As preliminary results show, the miniaturized E-Nose system has demonstrated the identification of essential oils extracted from mint, lavender, and eucalyptus plants.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.57 no.6
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• pp.1063-1068
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• 2008

BACnet(Building Automation and Control Networks) is a standard data communication protocol specifically designed for building automation and control systems, BACnet provides six options for data link layer protocols and these six data link layer options can be applied with various wired transmission media. Recently wireless technology prevails in automation area. ZigBee is an IEEE 802.15.4 based standard communication protocol for low-rate wireless personal area networks. In this study, we propose a BACnet over ZigBee model that adopts ZigBee communication channel as a wireless data link layer protocol in a BACnet-based communication network system. The technology proposed in this paper can expand the BACnet application using the advantages of wired and wireless integrated network solution.

• Proceedings of the KIEE Conference
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• 2004.07c
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• pp.2128-2130
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• 2004

High throughput analysis using a DNA chip microarray is powerful tool in the post genome era. Less labor-intensive and lower cost-performance is required. Thus, this paper aims to develop the multi-channel type label-free DNA chip and detect SNP (Single nucleotide polymorphisms). At first, we fabricated a high integrated type DNA chip array by lithography technology. Various probe DNAs were immobilized on the microelectrode array. We succeeded to discriminate of DNA hybridization between target DNA and mismatched DNA on microarray after immobilization of a various probe DNA and hybridization of label-free target DNA on the electrodes simultaneously. This method is based on redox of an electrochemical ligand.

• ETRI Journal
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• v.20 no.3
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• pp.284-300
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• 1998

A new thermosyphon cooling module (TSCM) has designed, fabricated and tested to cool the multi-chip module consists of a cold plate and an integrated condenser. With an allowable temperature rise of $56^{\circ}C$ on the surface of the heater, the cooling module TSCM can handle a heat flux of about 2.7 $W/cm^2$ using R11 as working fluid. The transient characteristics of the cooling module have been proved to be excellent: that is, when a heat load is applied inside of the system, steady state can be achieved within 10 to 15 minutes. It has been found that the length of the vapor channel between the cold plate and the condenser in addition to the ambient and the condenser temperatures affect the system performance.

• Proceedings of the IEEK Conference
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• 2004.08c
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• pp.455-459
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• 2004

Electrostatic discharge(ESD) is a serious reliability concern. It causes approximately most of all field failures of integrated circuits. Inevitably, future IC technologies will shrink the dimensions of interconnects, gate oxides, and junction depths, causing ICs to be increasingly susceptible to ESD-induced damage [1][2][3]. This thesis shows the optimization of the ESD protection circuit based on the tested results of MM (Machine Model) and HBM (Human Body Model), regardless of existing Reference in fully silicided 0.18 um CMOS process. His thesis found that, by the formation of silicide in a source and drain contact, the dimensions around the contact had a less influence on the ESD robustness and the channel width had a large influence on the ESD robustness [8].

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2883-2886
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• 2003

좋은 발성을 위하여 음성이 만들어지려면, 뇌의 언어중추의 명령에 의하여 신경망을 통하여 ‘호흡기관(폐와 흉곽. 호흡관련 근육들)’과 ‘발성기관(주로 후두 즉 성대)’ 그리고 ‘조음, 공명기관(인두, 구강 및 비강)’의 근육들이 유기적으로 작용하여야 한다. 이런 협력 체제에 문제가 생기면, 다양한 종류의 질환이 유발될 수 있다[1,2]. 현재 임상에서 음성 분석을 위해 사용되는 시스템은 대부분 성대의 진동을 측정하기 위해 stroboscopy, 전기성문파형검법 (EGG, electroglottography), 후두근전도 중의 한 방법과 음성 분석을 위한 분석 프로그램으로 구성되어 있다. 그러나, 발성은 호흡과 매우 밀접한 관계가 있어 음성, 성대의 진동, 호흡 관계를 종합적으로 관찰할 필요가 있다. 본 연구에서는 발성 시 성대 점막의 접촉 양상은 ECG 로 측정하며, 발성의 주 에너지원이 되는 호흡의 변화를 2 channel 인덕턴스 호흡감시 장치(RIP: repiratory inductive plethymography)를 이용하여 흉곽의 움직임과 상 복강의 움직임에 대하여 측정하며, 발성되는 음성은 마이크로폰을 통하여 측정하는 ‘EGG, 음성, 호흡 통합검사 장치’를 개발하였다.

• JSTS:Journal of Semiconductor Technology and Science
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• v.16 no.2
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• pp.210-214
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• 2016

In this paper, the decrease in the contact resistance of Ni germanide/Ge contact was studied as a function of the thickness of the antimony (Sb) interlayer for high performance Ge MOSFETs. Sb layers with various thickness of 2, 5, 8 and 12 nm were deposited by RF-Magnetron sputter on n-type Ge on Si wafers, followed by in situ deposition of 15nm-thick Ni film. The contact resistance of samples with the Sb interlayer was lower than that of the reference sample without the Sb interlayer. We found that the Sb interlayer can lower the contact resistance of Ni germanide/Ge contact but the reduction of contact resistance becomes saturated as the Sb interlayer thickness increases. The proposed method is useful for high performance n-channel Ge MOSFETs.

• Korean Journal of Computational Design and Engineering
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• v.15 no.3
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• pp.167-177
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• 2010

In recent years, the use of high-resolution tiled display system which does not have restrictions on the size of the screen and implements various layout of tile is increasing in order to evaluate the digital mock-up in physical scale or explore large engineering data set in detail. In this study, we developed multi-channel distributed visualization system which provides a virtual reality-based visual contents using 3D open-source graphics engine. Efficient data structures and exchange methods were proposed as a scene synchronization technology in PC cluster environments. DLP-Cube based tiled visualization system which provides $5{\times}2$ layout of display wall was developed and we validated our approach using this system. In addition, we introduced integrated control program that administrates PC cluster environment in remote and controls the layout of display channels.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.04a
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• pp.195-196
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• 2000

A passband-flattening technique based on Fourier optics concept for phased-array wavelength router is presented. For easy control of optical power in each waveguide without phase correction, misaligned array waveguides are used. BPM simulation results indicate that flat passband is as wide as 75 % of the channel spacing with the insertion loss penalty of about 6 dB and with the crosstalk of about -28 dB.