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Effects of College English FnF (Focus on Form) Class Types on Target Vocabulary and Grammar (대학 교양영어 FnF수업유형이 목표어휘와 목표문법의 습득에 미치는 효과)

  • Kim, Young-hee
    • Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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    • v.7 no.12
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    • pp.371-380
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    • 2017
  • This paper aims to explore a comparative instructional effects among meaning-based communicative language teaching, input-enhanced FnF instruction and output-enhanced FnF instruction in order to optimize the teaching methods of target grammar and vocabulary. The experiment selected three homogeneous groups of 30 students in each group for the comparison: One comparative group with communicative language teaching, one input-enhanced FnF group and another output-enhanced FnF group. The result indicates that the input-enhanced group outperformed the comparative group in the grammar test with statistical significance and the output-enhanced group overweighted the comparative group in the vocabulary test. However, no significant statistical difference was found between the input-enhanced group and the output-enhanced group. The conclusion from the result could bear the following pedagogical implication: The general English education must use the eclectic method of adopting communicative language teaching with FnF of input-enhanced target grammar and output-enhanced target vocabulary to supplement the students with the basic vocabulary and grammar.

A Review of SiC Static Induction Transistor (SIT) Development for High-Frequency Power Amplifiers

  • Sung, Y.M.;Casady, J.B.;Dufrene, J.B.
    • KIEE International Transactions on Electrophysics and Applications
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    • v.11C no.4
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    • pp.99-106
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    • 2001
  • An overview of Silicon Carbide (SiC) Static Induction Transistor (SIT) development is presented. Basic conduction mechanisms are introduced and discussed, including ohmic, exponential, and space charge limited conduction (SCLC) mechanisms. Additionally, the impact of velocity saturation and temperature effects on SCLC are reviewed. The small-signal model, breakdown voltage, power density, and different gate structures are also discussed, before a final review of published SiC SIT results. Published S-band (3-4 GHz) results include 9.5 dB of gain and output power of 120 W, and L-band (1.3 GHz) results include 400 W output power, 7.7 dB of gain, and power density of 16.7 W/cm.

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마이크로 컴퓨터를 이용한 신경근 차단 감시장치의 개발에 관한 연구

  • 전계록;조진호
    • Journal of Biomedical Engineering Research
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    • v.11 no.2
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    • pp.257-268
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    • 1990
  • A system has been developed for monitoring the effect of neuromuscular blocking frugs and the neuromuscular function during anesthesia and surgery. This system is composed of software and hardware, the latter are nerve stimulator, force transducer, interface board(preamplifier, filter, peripheral input/output) and personal computer (apple ll) , the former are programmed in ASSEMBLY and BASIC language. The nerve stimulator which is controlled by personal computer is capable of delivering single shocks at o.)Hz, train of four at 2Hz and tetanic stimulation at 30, 100, 200Hz. The response, adduction of the thumb, is sensed by the force transducer. The output of the force transducer Is amplified, filtered, converted digital signal and then processed by the per- sonal computer. The personal computer quantia4es twitch and traln of four tesponse and calculates the 74 ratio (Ta/Tl )between the first and fourth response of train of four. This ratio is used to estimate the level of the neuromuscular block. This system has reaserch potential for determining the effect of newer neuromuscular blocking drugs for comparlsion with presently used drugs of alternatively, for delerminig the effects of blocking drugs in altered physilogical states.

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Investigation and Circuit Analysis for DC-DC Converter (DC-DC Converter 특성검토 및 회로해석)

  • Hwang, Su-Seol;Lee, Jae-Deuk
    • Aerospace Engineering and Technology
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    • v.5 no.2
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    • pp.166-173
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    • 2006
  • A DC-DC converter is a device that accepts a DC input voltage and produces a DC output voltage. Typically the output produced is at a different voltage level than the input. In addition, DC-DC converters are used to provide noise isolation, power bus regulation, etc. In this paper, it reviews some kinds of the popular DC-DC converter topolopgies and performs simulation selected basic type of DC-DC Converter.(Buck-type Converter)

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Research on High Efficiency Non-Isolated Push-Pull Converters with Continuous Current in Solar-Battery Systems

  • Li, Yan;Zheng, Trillion Q.;Chen, Qian
    • Journal of Power Electronics
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    • v.14 no.3
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    • pp.432-443
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    • 2014
  • In order to improve the output efficiency of solar cells and to extend the life span of batteries, the input currents of converters are required to be continuous. If low output voltage ripple is required at the same time, it is obvious that the application of basic two-order converters (such as Buck and Boost derived converters) will not be good enough. In this paper, a lot of non-isolated push-pull converters (NIPPCs) with continuous current will be introduced due to their lower current stress, higher efficiency and better EMC performance. By decomposing the converters into push-pull cells, inductor and free-wheeling diodes, two families of NIPPCs based on single inductor and coupled inductor separately are systematically generated. Furthermore, characteristics analyses for some of the generated converters are also shown in this paper. Finally, two prototypes based on the corresponding typical topologies are built in the lab to verify the theoretical outcomes.

Design and Performance Analysis of Axial-Flux Permanent-Magnet Generator for Wind Energy System Applications (횡자속형 영구자석 풍력발전기 설계 및 특성해석)

  • Hwang, Don-Ha;Kang, Do-Hyun;Kim, Yong-Joo;Bae, Sung-Woo;Choi, Kyeong-Ho;Kim, Dong-Hee
    • Proceedings of the KIEE Conference
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    • 2002.07b
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    • pp.949-951
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    • 2002
  • Permanent-magnet (PM) synchronous generator is feasible for use with a wind turbine, because the generator for wind power requires variable-speed generation, light weight, and high torque. In this paper, basic design and construction of an axial-flux permanentmagnet generator with power output at 60 [Hz], 300 [r/min] for wind energy system is introduced. Finite-element method (FEM) is applied to analyze generator performance. In order to save time, equivalent analysis model is developed. The performance of the proposed generator at no-load and resistive load are compared, and power output and voltage at various speed and loads are compared as well. The results of FE analysis show that this PM generator is a useful solution for small-scale wind-turbine applications.

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Plan for the Development of a Standardized Dummy for Persons in Need of Rescue in a Confined Space (밀폐공간 구조 요구자를 위한 더미 표준화 개발 방안)

  • Choi, Seo-Yeon;Rie, Dong-Ho;Kim, Hyung-Jun
    • Journal of the Korea Safety Management & Science
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    • v.18 no.4
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    • pp.99-105
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    • 2016
  • This study was conducted to develop a dummy in an environment similar to the human body, to prepare a standard for evaluation and to present the process of the production in order to evaluate the performance of the robot that can detect the persons needing rescue in a confined space, who are difficult for fire-fighting officials to rescue in case of fire and disaster. As a result, a standard for evaluation was developed and standardized into four parts 'Normal,' 'Risk Stage 1,' 'Risk Stage 2' and 'Risk Stage 3'based on the number of breath cycles, carbon dioxide concentration, core temperature and criteria for hearing to recognize the voice. In addition, in order to produce a dummy, fever, breathing capacity and voice output function were compared and analyzed. This study has significance that it built up basic data of the method of producing the actual dummy, by presenting characteristics and controlling methods using the waterproof insulation heating coil for the function, solenoid valve for the consecutive output of breathing capacity and USB program sound board for voice output.

Application of Bias-Correction and Stochastic Analogue Method (BCSA) to Statistically Downscale Daily Precipitation over South Korea (남한지역 일단위 강우량 공간상세화를 위한 BCSA 기법 적용성 검토)

  • Hwang, Syewoon;Jung, Imgook;Kim, Siho;Cho, Jaepil
    • Journal of The Korean Society of Agricultural Engineers
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    • v.63 no.6
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    • pp.49-60
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    • 2021
  • BCSA (Bias-Correction and Stochastic Analog) is a statistical downscaling technique designed to effectively correct the systematic errors of GCM (General Circulation Model) output and reproduce basic statistics and spatial variability of the observed precipitation filed. In this study, the applicability of BCSA was evaluated using the ASOS observation data over South Korea, which belongs to the monsoon climatic zone with large spatial variability of rainfall and different rainfall characteristics. The results presented the reproducibility of temporal and spatial variability of daily precipitation in various manners. As a result of comparing the spatial correlation with the observation data, it was found that the reproducibility of various climate indices including the average spatial correlation (variability) of rainfall events in South Korea was superior to the raw GCM output. In addition, the needs of future related studies to improve BCSA, such as supplementing algorithms to reduce calculation time, enhancing reproducibility of temporal rainfall patterns, and evaluating applicability to other meteorological factors, were pointed out. The results of this study can be used as the logical background for applying BCSA for reproducing spatial details of the rainfall characteristic over the Korean Peninsula.

The Design and Characteristics Comparison of 600W Class Consequent Pole Type IPMSM (600W급 Consequent Pole Type IPMSM 설계 및 특성 비교)

  • Gim, Gyu-Hwa;Park, Byung-Jun;Kim, Yongn-Tae;KimJang, Gyu-Tak
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.8
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    • pp.1040-1046
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    • 2018
  • The Permanent Magnet Synchronous Motor(PMSM) has various advantages. However, new types of research have been carried out because of rising prices of materials for rare earth magnets used in PMSM and also unstable supply. In this paper, we propose Consequent Pole(CP) type IPMSM for magnet reduction. The shape of CP type IPMSM stator was same with Basic model IPMSM. The design of the rotor shape was proceeded that CP type IPMSM achieved the same output as the basic model IPMSM. Finally, the selected model and IPMSM were compared and discussed.

Development of a Robust Nonlinear Prediction-Type Controller

  • Park, Ghee-Yong
    • 제어로봇시스템학회:학술대회논문집
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    • 1998.10a
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    • pp.445-450
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    • 1998
  • In this paper, a robust nonlinear prediction-type controller (RNPC) is developed for the continuous time nonlinear system whose control objective is composed of system output and its desired value. The basic control law of RNPC is derived such that the future response of the system is first predicted by appropriate functional expansions and the control law minimizing the difference between the predicted and desired responses is then calculated. RNPC which involves two controls, i.e., the auxiliary and robust controls into the basic control, shows the stable closed loop dynamics of nonlinear system of any relative degree and provides the robustness to the nonlinear system with parameter/modeling uncertainty. Simulation tests for the position control of a two-link rigid body manipulator confirm the performance improvement and the robustness of RNPC.

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