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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of IKEEE
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Institude of Korean Electrical and Electronics Engineers
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Volume & Issues
Volume 7, Issue 2 - Dec 2003
Volume 7, Issue 1 - Jul 2003
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A Study on the Design and Electrical Characteristics of High Performance Smart Power Device
Ku, Yong-Seo ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 1~8
In this study, the high performance BCD device structure which satisfies the high voltage and fast switching speed characteristics is devised. Through the process and device simulation, optimal process spec. & device spec. are designed. We adapt double buried layer structure, trench isolation process, n-/p-drift region formation and shallow junction technology to optimize an electrical property as mentioned above. This I.C consists of 20V level high voltage bipolar npn/pnp device, 60V level LDMOS device, a few Ampere level VDMOS, 20V level CMOS device and 5V level logic CMOS.
Design of a Small-Area Finite-Field Multiplier with only Latches
Lee, Kwang-Youb ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 9~15
An optimized finite-field multiplier is proposed for encryption and error correction devices. It is based on a modified Linear Feedback Shift Register (LFSR) which has lower power consumption and smaller area than prior LFSR-based finite-field multipliers. The proposed finite field multiplier for GF(2n) multiplies two n-bit polynomials using polynomial basis to produce
mod p(x), where p(x) is a irreducible polynomial for the Galois Field. The LFSR based on a serial multiplication structure has less complex circuits than array structures and hybrid structures. It is efficient to use the LFSR structure for systems with limited area and power consumption. The prior finite-field multipliers need 3
m flip-flops for multiplication of m-bit polynomials. Consequently, they need 6
m latches because one flip-flop consists of two latches. The proposed finite-field multiplier requires only 4
m latches for m-bit multiplication, which results in 1/3 smaller area than the prior finite-field multipliers. As a result, it can be used effectively in encryption and error correction devices with low-power consumption and small area.
Design of Optical Polarizer using Three-channel Rib-type Couplers
Hong, Kwon-Eui ; Lee, Won-Seock ; Ho, Kwang-Chun ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 16~21
A rigorous modal transmission-line theory (MTLT) based on effective dielectric method (EDM) is introduced and developed to analyze the polarization beam-splitting of optical rib-type directional coupler with three guiding layers. Furthermore, to confirm the validity of approach proposed in this paper, we compare our results with those ones of BeamPROP, which is a commercial software package used widely. Consequently, the numerical results reveal that the hybrid modes incident into a guiding channel of rib-type coupler are split well through upper and lower guiding channels in a polarization length.
Improvement of Stimulus Pattern and Design of Discrimination System for Coincident ratio Elevation with Traditional Meridians
Lee, Yong-Heum ; Ko, Su-Bok ; Jeong, Dong-Myong ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 22~31
Conventional stimulus patterns have used DC for discrimination of acupoint and meridian which is the basic object of diagnosis and medical treatment in oriental medicine. Those discriminate conduction points by stimulation on body skin with DC. But, it is insufficient to reliability in discrimination ratio, coincident ratio, body effect, reproductivity. Therefore, this paper has extracted the optimal parameter of frequency and waveform in order to improve conventional pattern, and proposed the SPAC(Single Power Alternative Current) stimulus pattern applying that. Also, We proposes algorithm which is able to discriminate with low pressure of the electrode by displaying in the level meter both the absolution and relation value of the skin current. It can decrease pain and body effect by electrode pressure and discriminate acupoint regardless of skin current in difficult discrimination spot. We have compared the performance of system applying the extracted optimal parameter and algorithm. We have compared discrimination, coincident ratio of both conduction point and traditional acupoints by acupoint stimulation pattern. In the results, we confirmed reliability of SPAC stimulus pattern.
Radiation Pattern in Rectangular Microstrip Patch Antenna with Anisotropy Substrates and Superstrate
Yoon, Joong-Han ; Lee, Hwa-Choon ; Kwak, Kyung-Sup ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 32~42
In this paper, radiation pattern of rectangular microstrip patch antenna with anisotropy substrates and superstrate is studied by using a rigorous full-wave approach and a moment method calculation. Dyadic Green's function is derived for selected anisotropy material by constitutive relation. From these results, integral equations of electric fields are formulated. The electric field integral equations are discretized into the matrix form by applying Galerkin's moment method and then the current coefficients are obtained.. After solving the current coefficients, the far-zone electric field in spherical coordinates can be obtained by using the stationary phase method. To verify the validity of numerical result, we compare our result with existing one and get a good agreement between them. From the numerical results, the radiation patterns for variation of uniaxial superstrate thickness, anisotropy ratio of substrate and superstrate layer are presented and analyzed.
A New Variable Degeneration Resistor for Digitally Programmable CMOS VGA
Kwon, Duck-Ki ; Park, Jong-Tae ; Yu, Chong-Gun ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 43~55
A degenerated differential pair has been widely used as a standard topology for digitally programmable CMOS VGAs. A variable degeneration resistor has been implemented using a resistor string or R-2R ladder with MOSFET switches. However, in the VGAs using these conventional methods, low-voltage and high-speed operation is very hard to achieve due to the dc voltage drop over the degeneration resistor. To overcome the problem a new variable degeneration resistor is proposed where the dc voltage drop is almost removed. The proposed gain control scheme makes it easy to implement a low-voltage and high-speed VGA. This paper describes the problems existed in conventional methods, the principle and advantages of the proposed scheme, and their performance comparison in detail. A CMOS VGA cell is designed using the proposed degeneration resistor. The 3dB bandwidths are greater than 650㎒ and the gain errors are less than 0.3dB in a gain control range from -12dB to +12dB in 6dB steps. It consumes 3.1㎃ from a 2.5V supply voltage.
A Design of an Adder and a Multiplier on
Yoon, Byoung-Hee ; Choi, Young-Hee ; Kim, Heung-Soo ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 56~62
In this paper, we designed a adder and a multiplier using current mode T-gate on
. The T-gate is consisted of current mirror and pass transistor, the designed 4-valued T-gate used adder and multiplier on
. We designed its under 1.5um CMOS standard technology. The unit current of the circuits is 15㎂, and power supply is 3.3V VDD. The proposed current mode CMOS operator have a advantage of module by T-gate`s arrangement, and so we easily implement multi-valued operator.
The QoS support using DSR protocol In Mobile Ad-hoc Network
Park, Gyong-Bae ; Kang, Kyoeng-In ; Oh, Se-Duck ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 63~71
In this paper, we propose an DSR(Dynamic Source Routing) protocol to support QoS for reliable data transmission in the mobile ad-hoc network. The proposed algorithm uses DSR protocol to support QoS as its basic routing protocol, and uses the nodes which are between source and destination nodes as key QoS support. Because of moving nodes there is some problem that is restricted reliable data transmission. For solve this problem, source node set up the QoS link with destination node. The nodes that are located at QoS link and find out loss of transmission path save the transmitting data packets. Those search a new transmission path to destination node and transmit the saved data packet to destination node. As the result of evaluation, we found the proposed QoS network guaranteed reliable data transmission with almost 100% data reception rate for slowly moving mobile ad-hoc network and with more 96% data reception rate, which is improvement of 3.7737% reception rate compared with none QoS network, for continuously fast moving mobile ad-hoc network
CMOS Gigahertz Low Power Optical Preamplier Design
Whang, Yong-Hee ; Kang, Jin-Koo ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 72~79
Classical designs of optical transimpedance preamplifier for p-i-n photodiode receiver circuits generally employ common source transimpedance input stages. In this paper, we explore the design of a class of current-mode optical transimpedance preamplifier based upon common gate input stages. A feature of current-mode optical transimpedance preamplifier is high gain and high bandwidth. The bandwidth of the transimpedance preamplifier can also be increased by the capacitive peaking technique. In this paper we included the development and application of a circuit analysis technique based on the minimum noise. We develop a general formulation of the technique, illustrate its use on a number of circuit examples, and apply it to the design and optimization of the low-noise transimpedance amplifier. Using the noise minimization method and the capacitive peaking technique we designed a transimpedance preamplifier with low noise, high-speed current-mode transimpedance preamplifier with a 1.57GHz bandwidth, and a 2.34K transimpedance gain, a 470nA input noise current. The proposed preamplifier consumes 16.84mW from a 3.3V power supply.
A Routing Scheme for Multi-Classes in Multi-hop LEO Satellite Networks with Inter-Satellite Links
Lee, Bong-Ju ; Kim, Young-Chon ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 80~87
This paper proposes a routing scheme for multi-hop LEO satellite networks with inter-satellite links aiming for reducing the number of link handovers while keeping the efficient use of network resource. The proposed routing scheme controls the link handovers by taking account of the deterministic LEO satellite system dynamics, geographical location of a ground terminal and statistic information of call duration. The performance of the proposed routing scheme has been evaluated and compared with previous routing schemes in terms of average number of link handovers during a call, the call blocking and dropping probability, and the network utilization.
Implementation of Linear Power Amplifier with 1.9 GHz for PCS Basestation
Kim, Sang-Ki ; Bang, Sung-Il ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 88~96
In this paper, We designed and implemented a linear high-power amplifier which can be used for the commercial service in band of
at U.S.A. The output power of the implemented linear high power amplifier is 25W. In order to satisfy IMD characters decided by FCC, the Feedforward linearization techniques has been used. The used feedforward method has improved the IMD characteristics from 10.51dBc to 19.01dBc in each power level from 1W(30dBm) to 25W(44dBm). The IMD level of the final output shows from minimum 64.84dBc to maximum 68.17dBc. Because this good characteristics of IMD, the LPA is expected to use as a commercial product of PCS base station.
A Rule for Reducing Error Remains in Multicopy Transmission ARQ
Shin, Woo-Cheol ; Park, Jin-Kyung ; Ha, Jun ; Choi, Cheon-Won ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 97~106
In ARQ based error control, imperfect error detection leaves error remains on a packet. Aiming for a reduction of error remains in multicopy transmission ARQ system, we propose a rule of requesting a retransmission and deciding a correct copy, (identified as
rule). While the probability of error remains is reduced by the employment of the
rule at multicopy transmission ARQ, delay and throughput performance may be degraded in comparison with those of conventional single copy transmission ARQ. Thus, we develop an analytical method to evaluate the performance trade-off in multicopy transmission ARQ following the
rule. From the numerical results obtained by the analytical method, we investigate the effect of channel characteristics on the performance of error remains, packet loss, throughput, and packet delay, and confirm that the adaptability of the
rule to conform to various QoS requirements with ease.
Fault Detection and Diagnosis of the Deaerator System in Nuclear Power Plants
Kim, Bong-Seok ; Lee, In-Soo ; Lee, Yoon-Joon ; Kim, Kyung-Youn ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 107~118
In this paper, dynamic control model is formulated by considering the geometrical structure of the deaerator storage tank in nuclear power plant and input-output flow rate at steady state, and we describe fault detection and diagnosis (FDD) scheme based on the adaptive estimator. The performance and effectiveness of the proposed FDD scheme are evaluated by applying real operating data obtained from the YOUNGKWANG 3 & 4 FSAR.
Surgical Simulation Environment for Replacement of Artificial Knee Joint
Kim, Dong-Min ;
Journal of IKEEE, volume 7, issue 1, 2003, Pages 119~126
This paper presents a methodology for constructing a surgical simulation environment for the replacement of artificial knee join using CT image data. We provide a user interface of preoperative planning system for performing complex 3-D spatial manipulation and reasoning tasks. Simple manipulation of joystick and mouse has been proved to be both intuitive and accurate for the fitness and the wear expect of joint. The proposed methodology are useful for future virtual medical system where all the components of visualization, automated model generation, and surgical simulation are integrated.