• Title/Summary/Keyword: Dual-Function

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Cost-effective single board PDP sustaining driver with dual resonant method

  • Lim, Hyun-Muk;Eom, Cheol-Hwan;Lee, Jun-Young
    • Proceedings of the KIPE Conference
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    • 2008.06a
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    • pp.446-448
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    • 2008
  • A new plasma display panel sustaining driver using single side sustaining technique with the dual resonant method is proposed. Since this circuit enables to reduce switches in energy recovery circuit with keeping voltage stress like that of prior circuit, it can be low cost circuit comparing with a conventional driver. To integrate sustain function into one side with single power source in the driver, a charge pump method is adopted to make negative sustaining voltage and achieve dual resonant energy recovery on sustaining modes.

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Dual Mode AMOLED Pixel Circuit

  • Bae, Byung-Seong;Son, Yong-Duck;Jang, Jin;Lee, Ki-Yong;Chung, Ho-Kyoon
    • 한국정보디스플레이학회:학술대회논문집
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    • 2006.08a
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    • pp.1082-1085
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    • 2006
  • We proposed dual mode pixel circuit in AMOLED (active matrix organic light emitting device). After light emitting period of OLED, we used it as a photo sensor. We measured photo current of OLED and simulated the proposed pixel circuit to verify it's function of dual mode, that is lighting and sensing.

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EXTENSIONS OF t-MODULES

  • Woo, Sung-Sik
    • Communications of the Korean Mathematical Society
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    • v.9 no.2
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    • pp.361-367
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    • 1994
  • An elliptic module is an analogue of an elliptic curve over a function field [D]. The dual of an elliptic curve E is represented by Ext(E, $G_{m}$) and the Cartier dual of an affine group scheme G is represented by Hom(G, G$G_{m}$). In the category of elliptic modules the Carlitz module C plays the role of $G_{m}$. Taguchi [T] showed that a notion of duality of a finite t-module can be represented by Hom(G, C) in a suitable category. Our computation shows that the Ext-group as it stands is rather too "big" to represent a dual of an elliptic module.(omitted)

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A Dual Problem and Duality Theorems for Average Shadow Prices in Mathematical Programming

  • Cho, Seong-Cheol
    • Journal of the Korean Operations Research and Management Science Society
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    • v.18 no.2
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    • pp.147-156
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    • 1993
  • Recently a new concept of shadow prices, called average shadow price, has been developed. This paper provides a dual problem and the corresponding duality theorems justifying this new shadow price. The general duality framework is used. As an important secondary result, a new reduced class of price function, the pp. h.-class, has been developed for the general duality theory. This should be distinguished from other known reductions achieved in some specific areas of mathematical programming, in that it sustains the strong duality property in all the mathematical programs. The new general dual problem suggested with this pp. h.-class provides, as an optimal solution, the average shadow prices.

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Development of Dual Mass Flywheel (이중질량플라이휠의 개발)

  • 지태한;정재훈;송영래
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2003.11a
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    • pp.1067-1072
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    • 2003
  • Generally dual mass flywheel(DMF) is used as a solution to reduce noise and vibration of power train system and to improve the comfortability of passenger car. In this paper, design concept of new DMF model, analytical/numerical model, test procedure and tuning results are presented. Design parameters are studied by some numerical methods and tests. As the result, we can find more efficient model of DMF and reduce vibration level in power train system.

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Optimal Trajectory Planning for Cooperative Control of Dual-arm Robot (양팔 로봇의 협조제어를 위한 최적 경로 설계)

  • Park, Chi-Sung;Ha, Hyun-Uk;Lee, Jang-Myung
    • Journal of Institute of Control, Robotics and Systems
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    • v.16 no.9
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    • pp.891-897
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    • 2010
  • This paper proposes a cooperative control algorithm for a dual-arms robot which is carrying an object to the desired location. When the dual-arms robot is carrying an object from the start to the goal point, the optimal path in terms of safety, energy, and time needs to be selected among the numerous possible paths. In order to quantify the carrying efficiency of dual-arms, DAMM (Dual Arm Manipulability Measure) has been defined and applied for the decision of the optimal path. The DAMM is defined as the intersection of the manipulability ellipsoids of the dual-arms, while the manipulability measure indicates a relationship between the joint velocity and the Cartesian velocity for each arm. The cost function for achieving the optimal path is defined as the summation of the distance to the goal and inverse of this DAMM, which aims to generate the efficient motion to the goal. It is confirmed that the optimal path planning keeps higher manipulability through the short distance path by using computer simulation. To show the effectiveness of this cooperative control algorithm experimentally, a 5-DOF dual-arm robot with distributed controllers for synchronization control has been developed and used for the experiments.

Optimal Dual Pricing and Passenger Safety Level for Cruise Revenue Management

  • Cho, Seong-Cheol;Zhang, Mengfei
    • Journal of Navigation and Port Research
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    • v.41 no.2
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    • pp.63-70
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    • 2017
  • Despite the remarkable continual growth of the world cruise industry, studies have yet to be attempted on many revenue management problems in cruise operations. This paper suggests two schemes that can be easily applied to cruise revenue management: optimal dual pricing and passenger safety level. In optimal dual pricing, a pair of higher and lower prices is applied to cabin reservation through market segmentation. This scheme can be executed with a linear price-response function for the current unreserved cabins. A cruise line could benefit from this scheme to maximize reservation revenue while attaining full occupancy. The dual pricing scheme is also devised to produce only integer demands to suit real management practices. The life boat capacity is an additional service capacity unique to the cruise industry, catering to passengers' safety. The concept of passenger safety level is defined and computed for any passenger life boat capacity of a cruise ship. It can be used to evaluate the passenger safety of a cruise ship in operation, as well as to determine the number of life boat seats required for a new cruise ship. Hypothetical examples are used to illustrate the operation of these two schemes.

Analysis of Dual-mode Resonator with Short-Stub (단락형 스터브에 의한 이중 모드 공진기의 해석)

  • Yun, Tae-Soon
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2013.05a
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    • pp.497-499
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    • 2013
  • In this paper, electrical lengths and impedances of a dual-mode resonator are calculated by using the transfer function of a dual-mode resonator by realizing the short-stub. The electrical length of transmission-line for a resonator is function of the frequency and the electrical length of stub is defined by the frequency and impedances of line and stub. Also, the inverter value of a bandpass filter using the dual-mode resonator is calculated. The effect of stub's impedance for inverter is very small. And, as the impedance of line is decreasing, the inverter value is increasing and as the bandwidth is increasing, the inverter value is increasing.

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Development of Twin-Objective Actuator with Radial Tilt Function for Blu-Ray Disc Recorder (BD Recorder용 3축 독립구동 Twin-Objective 액추에이터 개발)

  • Kim, Seok-Jung;Heor, Tae-Youn;Kim, Tae-Kyung;Ahn, Young-Man;Chung, Chong-Sam;Park, Soo-Han
    • Transactions of the Society of Information Storage Systems
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    • v.1 no.2
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    • pp.121-126
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    • 2005
  • Recently, an optical disc system has been proposed using blue laser diode, high NA objective lens and groove only disc structure. A new method is needed to readout CD and DVD in this Blu-Ray Disc Recorder. In order to readout CD and DVD in Blu-Ray Disc Recorder, we adopted dual-lenses actuator in consideration of optical utilization efficiency, optical performance and insurance of sufficient W.D(working distance). This dual-lenses actuator has two objectives in radial direction, one is for CD/DVD and the other is for BD. We had to solve the induced problems of collision between disc and lens, DC tilt increase, AC tilt increase, 2nd resonance deterioration and AC sensitivity drop caused by disposing two lenses in an actuator. Also we developed high response twin- objective actuator with radial tilt function to apply high-speed BD Recorder or BD Player. Consequently we presented that two kinds of dual-lenses actuators for BD Recorder have been possessed good performance in 3 axis directions. And we measured eye patterns of CD, DVD and BD by using one BD optical pick-up with dual-lenses actuator.

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Study on Dual-Energy Signal and Noise of Double-Exposure X-Ray Imaging for High Conspicuity

  • Song, Boram;Kim, Changsoo;Kim, Junwoo
    • Journal of Radiation Protection and Research
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    • v.46 no.4
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    • pp.160-169
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    • 2021
  • Background: Dual-energy X-ray images (DEI) can distinguish or improve materials of interest in a two-dimensional radiographic image, by combining two images obtained from separate low and high energies. The concepts of DEI performance describing the performance of double-exposure DEI systems in the Fourier domain been previously introduced, however, the performance of double-exposure DEI itself in terms of various parameters, has not been reported. Materials and Methods: To investigate the DEI performance, signal-difference-to-noise ratio, modulation transfer function, noise power spectrum, and noise equivalent quanta were used. Low- and high-energy were 60 and 130 kVp with 0.01-0.09 mGy, respectively. The energy-separation filter material and its thicknesses were tin (Sn) and 0.0-1.0 mm, respectively. Noise-reduction (NR) filtering used the Gaussian-filter NR, median-filter NR, and anti-correlated NR. Results and Discussion: DEI performance was affected by Sn-filter thickness, weighting factor, and dose allocation. All NR filtering successfully reduced noise, when compared with the dual-energy (DE) images without any NR filtering. Conclusion: The results indicated the significance of investigating, and evaluating suitable DEI performance, for DE images in chest radiography applications. Additionally, all the NR filtering methods were effective at reducing noise in the resultant DE images.