• Title, Summary, Keyword: dual modules

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INVERTIBILITY OF GENERALIZED BESSEL MULTIPLIERS IN HILBERT C-MODULES

  • Tabadkan, Gholamreza Abbaspour;Hosseinnezhad, Hessam
    • Bulletin of the Korean Mathematical Society
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    • v.58 no.2
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    • pp.461-479
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    • 2021
  • This paper includes a general version of Bessel multipliers in Hilbert C∗-modules. In fact, by combining analysis, an operator on the standard Hilbert C∗-module and synthesis, we reach so-called generalized Bessel multipliers. Because of their importance for applications, we are interested to determine cases when generalized multipliers are invertible. We investigate some necessary or sufficient conditions for the invertibility of such operators and also we look at which perturbation of parameters preserve the invertibility of them. Subsequently, our attention is on how to express the inverse of an invertible generalized frame multiplier as a multiplier. In fact, we show that for all frames, the inverse of any invertible frame multiplier with an invertible symbol can always be represented as a multiplier with an invertible symbol and appropriate dual frames of the given ones.

Implementation of Small Size Dual Band PAM using LTCC Substrates (LTCC를 이용한 Small Size Dual Band PAM의 구현)

  • Shin, Yong-Kil;Chung, Hyun-Chul;Lee, Joon-Geun;Kim, Dong-Su;Yoo, Jo-Shua;Yoo, Myong-Jae;Park, Seong-Dae;Lee, Woo-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.357-358
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    • 2005
  • Compact power amplifier modules (PAM) for WCDMA/KPCS and GSM/WCDMA dual-band applications based on multilayer low temperature co-fired ceramic (LTCC) substrates are presented in this paper. The proposed modules are composed of an InGaP/GaAs HBT PAs on top of the LTCC substrates and passive components such as RF chokes and capacitors which are embedded in the substrates. The overall size of the modules is less than 6mm $\times$ 6mm $\times$ 0.8mm. The measured result shows that the PAM delivers a power of 28 dBm with a power added efficiency (PAE) of more than 30 % at KPCS band. The adjacent-channel power ratio (ACPR) at 1.25-MHz and 2.25-MHz offset is -44dBc/30kHz and -60dBc/30kHz, respectively, at 28-dBm output power. Also, the PAM for WCDMA band exhibits an output power of 27 dBm and 32-dB gain at 1.95 GHz with a 3.4-V supply. The adjacent-channel leakage ratio (ACLR) at 5-MHz and 10-MHz offset is -37.5dBc/3.84MHz and -48dBc/3.84MHz, respectively. The measured result of the GSM PAM shows an output power of 33.4 dBm and a power gain of 30.4 dB at 900MHz with a 3.5V supply. The corresponding power added efficiency (PAE) is more than 52.6 %.

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A High-Power Step-up Converter with High Efficiency and Fast Control-to-Output Dynamics

  • Kang, Jeong-il;Roh, Chung-Wook;Moon, Gun-Woo;Youn, Myung-Joong
    • Journal of Power Electronics
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    • v.1 no.2
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    • pp.78-87
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    • 2001
  • A new high-power step-up based on the two-module parallel-input (PISO) modular dual inductor-fed push-pull converter is proposed. The proposed converter is operated at a constant duty cycle and employs and auxiliary circuit to control the output voltage with a phase-shift between two modules. It shows a high efficiency due to the greatly reduced switch turn-off stress. It also shows a high and linear voltage conversion ratio, low current stress in the output capacitor, and fast control-to-output dynamics. The operation principles and the mathematical models of the proposed converter are presented. Features of the proposed converter are discussed in comparison with the two-module PISO modular dual inductor-fed push-pull converter. Also, experimental results from a 50kHz, 800W, 350 Vdc prototype with an input voltage range of 20-32 Vdc are provided to confirm the validity of the proposed converter. The new converter compares favorably with the conventional counterpart, and is considered well siuted to high-power step-up applications.

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Fault Detection Methods in a Dual Redundant Power Controller for CRCS (제어봉 구동장치 제어시스템용 이중화 전력제어기에서의 고장검출 방법)

  • Kim, C.K.;Shin, J.R.;Cheon, J.M.;Lee, J.M.;Kwon, S.M.
    • Proceedings of the KIEE Conference
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    • pp.2606-2608
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    • 2005
  • In this paper we describe the fault detection methods in a Dual-Redundant Power Controller(DRPC) for Control Rod Control System(CRCS). The DRPC has the function of fault detection for controller itself and power modules. And in this paper we have described the some complex items out of fault detection methods for CRCS. By utilizing the suggested methods, we are convinced that these methods are applied to commercial use before long.

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FPGA Board Implementation for an Embedded Machine-to-Machine Remote Control System (임베디드 M2M 원격제어 시스템을 위한 FPGA 보드 구현연구)

  • Sanjaa, Bold;Baek, Jong Sang;Jeong, Hwan Jong;Oh, Seung Chan;Jeong, Min A;Lee, Yeon-U;Lee, Seong Ro
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.501-503
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    • 2013
  • This project presents a concept of mobile robots using prototypes, computing proposal oriented to embedded systems implementation. We implement our system using GPS module, Ultrasonic sensor(range sensors), H-bridge dual stepper control, DTMF(Dual-tone Multi-Frequency ) and LCD module. In this paper we construct a mechanical simple mobile robot model, which can measure the distance from obstacle with the aid of sensor and should able to control the speed of motor accordingly. Modules were interfaced with FPGA(Field Programmable Gate Array) controller for hardware implementation.

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Optical Design of Multimedia-Embedded LED Dental Astral Lighting using the Reverse Dual Reflector Method

  • Kwon, Young Hoon;Hwang, Hyo Chang;Jun, Hwa Joon;Kwon, Jin Hyuk
    • Journal of the Optical Society of Korea
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    • v.19 no.4
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    • pp.409-414
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    • 2015
  • Light-emitting diodes (LED) have many advantages for dental astral lighting because of their high color rendering index (CRI), low power consumption, light weight and longer life. A dental astral lamp is specially designed and simulated for securing the extra space for installing a multimedia display that will be helpful for treating young patients. The optical system using the reverse dual reflection method consisted of four illumination modules disposed at the four corners of the dental astral lamp, and each module comprises a high power LED, an elliptical mirror, and a multifacet reflector assembly using eight cylindrical mirrors. It is shown that the required illuminance, illumination pattern, and the illumination uniformity are well satisfied.

Design of GPS L1-CA/Galileo Dual Mode Receiver (GPS L1-CA/Galileo 겸용 수신기의 설계)

  • Kim, Chan-Mo;Im, Sung-Hyuk;Jee, Gyu-In;Cho, Yong-Beom
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.1
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    • pp.7-12
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    • 2008
  • A GNSS(Global Navigation Satellite System) using GPS provides us with very useful information concerning the positioning of users in many sectors such as transportation, social services, the justice system and customs services, public works, search and rescue systems and leisure. A GNSS using the Galileo satellite is due to work in 2008 and expected to be used in various fields such as aviation, marine transportation, land surveying, resources development precise agriculture, telemetics, and so on. In this paper, we discuss the implementation and testing of a combined GPS/Galileo receiver which we named KSTAR V1.0. Each tracking module of GPS/Galileo dual mode correlator has the five track arms which consist of Very Early code, Early code, Prompt code, late code, and Very late code. Each of 24 tracking modules can be assigned to GPS and/or Galileo signal by changing mode selection register. The basic correlator integration dump period is set to 1ms for GPS C/A code and fast Galileo signal tracking. The performance of the developed combined GPS/Galileo receiver was tested and evaluated using the IF (Intermediated Frequency)-level GPS/Galileo signal generator.

△-CLOSURES OF IDEALS WITH RESPECT TO MODULES

  • Ansari-Toroghy, H.;Dorostkar, F.
    • Honam Mathematical Journal
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    • v.30 no.1
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    • pp.101-113
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    • 2008
  • Let M be an arbitrary module over a commutative Noetherian ring R and let ${\triangle}$ be a multiplicatively closed set of non-zero ideals of R. In this paper, we will introduce the dual notion of ${\triangle}$-closure and ${\triangle}$-dependence of an ideal with respect to M and obtain some related results.

Development of Infrared Target for Dual-Sensor Imaging Seeker's Test and Evaluation in HILS System (이종센서 영상탐색기 시험평가를 위한 적외선 표적원 개발)

  • Park, Changhan;Song, Sungchan;Jung, Sangwoon
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.29 no.11
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    • pp.898-905
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    • 2018
  • In this work, infrared targets for a developed hardware-in-the-loop simulation(HILS) system are proposed for a performance test of a dual-sensor imaging seeker equipped with an infrared and a visible sensor that can lock and track for ground and air targets. This integrated system is composed of 100 modules of heat and light sources to simulate various kinds of target and the trajectory of moving targets based on scenarios. It is possible to simulate not only the position, velocity, and direction for these targets but also background clutter and jamming environments. The design and measurement results of an infrared target, such as the HILS system configuration, developed for testing and evaluation of a dual-sensor imaging seeker are described. In the future, it is planned to test the lock-on and tracking performance of an imaging seeker equipped with single or dual sensors dynamically in real time based on a simulation flight scenario in the developed HILS system.

The Fundamental Researches to Evaluate PVT Module Performance (PVT 모듈 성능 평가를 위한 기초 연구)

  • Kim, Pilkyu
    • Journal of the Korean Solar Energy Society
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    • v.38 no.4
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    • pp.1-9
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    • 2018
  • PVT modules commonly can be defined as a combination of PV modules and thermal collectors. After absorbing sun light, electricity and hot water can be actually provided to users simultaneously, which dual outputs (electricity and hot water) have drawn academic interest and industrial activities. Additionally, heat exchange between solar cell and flowing water can enhance solar cell efficiency. Because of PVT modules effectiveness, new international markets and commercial products have made. Especially European, facilities and measurement methods are established to evaluate PVT module performance. However, there are no currently appropriate internationally and domestic standards and facilities to test PVT module performance Herein, to test PVT module performance, indoor thermal simulators and fundamental standard study are considered.