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Radiation Dose Measurement of D-Shuttle Dosimeter for Radiation Exposure Management System (방사선피폭관리시스템를 위한 D-Shuttle 선량계의 방사선 선량측정)

  • Kweon, Dae Cheol
    • Journal of the Korean Society of Radiology
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    • v.11 no.5
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    • pp.321-328
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    • 2017
  • The purpose of the study is to provide basic data for the management of individual exposure and the monitoring of natural radiation dose using D-Shuttle dosimeter (Chiyoda Technol Corporation, Tokyo, Japan). The dose was calculated using D-Shuttle dosimeter. The dose was 1.346 mSv when exposed for 400 days, the annual dose per year was 1.228 mSv/year and the average dose per hour was $0.014{\mu}Sv/hr$. Domestic individual external dose (1.295 mSv/year = Korea average natural individual external dose) and domestic additional dose per year is -0.0663 mSv/year. D-Shuttle is a personal dosimeter for radiation monitoring. It can be used as a very useful dosimeter for ALARA because of its excellent detection capability of radiation, real-time radiation exposure management, alarm function of radiation work, and efficient and easy to use personal radiation dose management.. Radiation monitoring equipment for radiation workers and local residents can be used for radiation monitoring in hospitals, industry, medical sites, nuclear accident areas and hazardous areas in non-destructive areas.

Intercomparison Exercise at Harshaw 6600, DVG-02TM, and D-Shuttle Dosimeters for the Individual Monitoring of Ionizing Radiation

  • Kim, Dmitriy Spartakovich;Murayama, Kentaro;Nurtazin, Yernat;Koguchi, Yasuhiro;Kenzhin, Yergazy;Kawamura, Hiroshi
    • Journal of Radiation Protection and Research
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    • v.44 no.2
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    • pp.79-88
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    • 2019
  • Background: The main goal of experiments is to compare various operational and technical characteristics of D-Shuttle semiconductor personal dosimeters of the Japanese company "Chiyoda Technol Corporation" and Harshaw thermoluminescent dosimeters (TLD) manufactured by "Thermo Fisher Scientific" and DTL-02 of the Russian Research and Production Enterprise (RPE) "Doza" by their occupational and calibration exposure at various dose equivalents from 0.5 to 20 mSv of gamma-radiation. Materials and Methods: Besides dosimeters DTL-02, D-Shuttle and Harshaw TLD, there were also used: (1) the primary reference radionuclide source Hopewell Designs IAEA: G10-1-12 with $^{137}Cs$ isotope (an error is not more than 6% and activity is 20 Ci), and (2) the verification device UPGD-2M of RPE "Doza" and installed in the National Center for Expertise and Certification of the Republic of Kazakhstan (Kapchagai, the National Center for Expertise and Certification). Results and Discussion: The main results of researches are the following: (1) TLDs for Harshaw 6600 and DVG-02TM have an approximately equal measurement accuracy of the individual dose equivalents in the range from 0.5 to 20 mSv of gamma-radiation. (2) Advantages of dosimeters for Harshaw 6600 are due to the high measurement productivity and opportunity to indicate the dose on the skin $H_p$(0.07). Advantages of DVG-02TM consist of operation simplicity and lower cost than of Harshaw 6600. (3) D-Shuttles are convenient for use in the current and the operational monitoring of ionizing radiation. Measurement accuracy and 10% linearity of measurements are ensured when D-Shuttle is irradiated with dose equivalents below 1 mSv at the equivalent dose rate not higher than $3mSv{\cdot}hr^{-1}$. This allows using D-Shuttle at a routine technological activity. Conclusion: The obtained results of experiments demonstrate advantages and disadvantages of D-Shuttle semiconductor dosimeters in comparison with two TLD systems of DVG-02TM and Harshaw 6600.

A New Shuttle Plasmid That Stably Replicates in Clostridium acetobutylicum

  • Lee, Sang-Hyun;Kwon, Min-A;Choi, Sunhwa;Kim, Sooah;Kim, Jungyeon;Shin, Yong-An;Kim, Kyoung Heon
    • Journal of Microbiology and Biotechnology
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    • v.25 no.10
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    • pp.1702-1708
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    • 2015
  • We have developed a new shuttle plasmid, designated as pLK1-MCS that can replicate in both Clostridium acetobutylicum and Escherichia coli, by combining the pUB110 and pUC19 plasmids. Plasmid pLK1-MCS replicated more stably than previously reported plasmids containing either the pIM13 or the pAMβ1 replicon in the absence of antibiotic selective pressure. The transfer frequency of pLK1-MCS into C. acetobutylicum was similar to the transfer frequency of other shuttle plasmids. We complemented C. acetobutylicum ML1 (that does not produce solvents such as acetone, butanol, and ethanol owing to loss of the megaplasmid pSOL1 harboring the adhE1-ctfAB-adc operon) by introducing pLK1-MCS carrying the adhE1-ctfAB-adc operon into C. acetobutylicum ML1. The transformed cells were able to resume anaerobic solvent production, indicating that the new shuttle plasmid has the potential for practical use in microbial biotechnology.

Efficient heuristic of vehicle routing problem for container shuttle service (컨테이너 셔틀 서비스를 위한 차랑 경로 문제의 근사적 해법)

  • Shin, Jae-Young;Oh, Sung-Inn;Park, Jong-Won
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • pp.171-172
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    • 2009
  • Generally, the container road transportal ion am be divided into three types; short distance, long distance and shuttle transportation. Also container vehicle am be divided into three types according to the chassis types of vehicle; only 20-feet container, only 40-feet container, combined chassis trailer. This paper deals with Vehicle Routing Problem(VRP) for delivering containers considering shuttle transportation. The shuttle service occurs several amounts of container which is same as O/D pairs. This problem is similar to the previously studied VRP for delivering containers using combined chassis trailers, but the characteristics of shuttle service must be considered additionally. We formulate the container shuttle transportation planning problem using combined chassis trailers based on VRP with pick-up and delivery which can visit each node more than one time, and propose an efficient solution procedure.

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An Efficient Heuristic to Solve Vehicle Routing Problem for Container Shuttle Service (컨테이너 셔틀 서비스를 위한 차량 경로 문제의 근사적 해법)

  • Shin, Jae-Young;Oh, Sung-Inn;Park, Jong-Won
    • Journal of Navigation and Port Research
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    • v.33 no.8
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    • pp.583-588
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    • 2009
  • Generally, the container road transportation can be divided into three types; short distance, long distance and shuttle transportation. Specially, the shuttle service occurs several amounts of container which is same as O/D pairs. Also container vehicle can be divided into three types according to the chassis types of vehicle; only 20-feet container, only 40-feet container and combined chassis trailer. Combined chassis trailers can load two 20-feet containers or one 40-feet container. This paper deals with Vehicle Routing Problem (VRP) for delivering containers considering shuttle service. This problem is similar to the previously studied Shin and Oh (2008), but the characteristics of shuttle service must be considered additionally. We formulate the container shuttle transportation planning problem using combined chassis trailers based on VRP with pick-up and delivery which can visit each node more than one time, and propose an efficient solution procedure.

Analysis of Hydraulic Control System for Shuttle Power-shift Transmission (전후진 파워시프트 변속기 유압 제어 시스템 해석)

  • Kim, D.C.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.6 no.4
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    • pp.16-23
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    • 2009
  • The major system of an agricultural shuttle power-shift tractor is the transmission, using power-shift. Because the shifting performance depends on the hydraulic control system, the most important aspect of the optimization is the design of the hydraulic control system. This study was conducted to develop the simulation model of hydraulic control system for the shuttle power-shift transmission by using Easy5 software. Bench test was conducted to verify the simulation. Also, the design parameters which influence the pressure modulation characteristics were investigated.

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Optimum Design of the Mover for LMTT considering the Elastic Characteristic of the Linear Motor (리니어 모터의 전기적 특성을 고려한 LMTT용 이동체의 최적설계)

  • An T.W.;Han K.J.;Han D.S.;Lee S.W.;Lee K.M.;Lee J.M.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • pp.399-400
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    • 2006
  • LMTT(Linear Motor based Transfer Technology) is a new type of transfer system used in the maritime container terminal fur the port automation, and largely consists of a controller, shuttle car, and rail. The shuttle car is divided into the frame part, the driving part, and wheels. In order to design this system, various researches on each part of it must be conducted. In this study, we dealt with the optimum design for the frame part of the shuttle car designed from previous studies on the strength of the frame with respect to the number of cross beams to minimize the weight of the shuttle car and to satisfy design criteria of cargo-handling systems in container terminal. For the optimization of the frame, thicknesses of each beam were adopted as design variables, the weight of the frame as objective function, and stress and deflection per unit length as constraint condition.

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DThe Effect of Thickness Ratio and Hight Ratio of Inner Beam on Strength and Stiffness of Frame in Shuttle Car for LMTT (Inner Beam의 두께비 및 높이비가 LMTT용 Shuttle Car의 Frame 강도 및 강성에 미치는 영향)

  • Han, GD.S.;Han, G.J.;Lee, K.S.;Shim, J.J.;Kim, T.H.
    • Journal of Navigation and Port Research
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    • v.28 no.3
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    • pp.207-211
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    • 2004
  • The final goal of this research is to establish the relative dangerousness D/B for factors on seakeeping performance. This D/B is essential to develope the seakeeping performance evaluation system built-on-ship. The system is composed of the apparatus for measuring a vertical acceleration to be generated by the ship's motions, computer for calculating the synthetic seakeeping performance index and monitor for displaying the evaluating diagram of navigational safety of ship. In this paper, a methodology on the establishment of the relative dangerousness D/B for factors on seakeeping performance is presented by a numerical simulations, playing an important role on the algorithm of the program for calculating the synthetic seakeeping performance index. Finally, It is investigated whether the relative dangerousness D/B can be realized an accurate values according to the loading conditions, weather conditions, wave directions end present ship's speed of a model ship.

Autonomous-Driving Vehicle Learning Environments using Unity Real-time Engine and End-to-End CNN Approach (유니티 실시간 엔진과 End-to-End CNN 접근법을 이용한 자율주행차 학습환경)

  • Hossain, Sabir;Lee, Deok-Jin
    • The Journal of Korea Robotics Society
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    • v.14 no.2
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    • pp.122-130
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    • 2019
  • Collecting a rich but meaningful training data plays a key role in machine learning and deep learning researches for a self-driving vehicle. This paper introduces a detailed overview of existing open-source simulators which could be used for training self-driving vehicles. After reviewing the simulators, we propose a new effective approach to make a synthetic autonomous vehicle simulation platform suitable for learning and training artificial intelligence algorithms. Specially, we develop a synthetic simulator with various realistic situations and weather conditions which make the autonomous shuttle to learn more realistic situations and handle some unexpected events. The virtual environment is the mimics of the activity of a genuine shuttle vehicle on a physical world. Instead of doing the whole experiment of training in the real physical world, scenarios in 3D virtual worlds are made to calculate the parameters and training the model. From the simulator, the user can obtain data for the various situation and utilize it for the training purpose. Flexible options are available to choose sensors, monitor the output and implement any autonomous driving algorithm. Finally, we verify the effectiveness of the developed simulator by implementing an end-to-end CNN algorithm for training a self-driving shuttle.

Deep X-ray Mask with Integrated Micro-Actuator for 3D Microfabrication via LIGA Process (3차원 LIGA 미세구조물 제작을 위한 마이크로 액추에이터 내장형 X-선 마스크)

  • Lee, Kwang-Cheol;Lee, Seung-S.
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.26 no.10
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    • pp.2187-2193
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    • 2002
  • We present a novel method for 3D microfabrication with LIGA process that utilizes a deep X-ray mask in which a micro-actuator is integrated. The integrated micro-actuator oscillates the X-ray absorber, which is formed on the shuttle mass of the micro-actuator, during X-ray exposures to modify the absorbed dose profile in X-ray resist, typically PMMA. 3D PMMA microstructures according to the modulated dose contour are revealed after GG development. An X-ray mask with integrated comb drive actuator is fabricated using deep reactive ion etching, absorber electroplating, and bulk micromachining with silicon-on-insulator (SOI) wafer. 1mm $\times$ 1 mm, 20 $\mu$m thick silicon shuttle mass as a mask blank is supported by four 1 mm long suspension beams and is driven by the comb electrodes. A 10 $\mu$m thick, 50 $\mu$m line and spaced gold absorber pattern is electroplated on the shuttle mass before the release step. The fundamental frequency and amplitude are around 3.6 kHz and 20 $\mu$m, respectively, for a do bias of 100 V and an ac bias of 20 $V_{p-p}$ (peak-peak). Fabricated PMMA microstructure shows 15.4 $\mu$m deep, S-shaped cross section in the case of 1.6 kJ $cm^{-3}$ surface dose and GG development at 35$^{\circ}C$ for 40 minutes.