• 한국자동차공학회논문집
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• 제3권6호
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• pp.224-237
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• 1995

An ECU(Electronic Control Unit) with 16 bit microcomputer has been developed. This system includes hardware and software for more precise control on fuel injection, ignition timing, and idle speed. This control system employs an air flow sensor of the hot wire type, a direct ignition system, an idle speed control system using a solenoid valve, and a crank angle sensor. Especially, the crank angle sensor provides two separate signals: One is the position signal(POS) which indicates 180 degree pulses per revolution, and the other is the reference signla(REF) that represents each cylinder individually. The conventional engine control system requires at least two engine revolutions in order to identify the cylinder number. However, the developed engine control system can recognize the cylinder number within a quarter of an engine revolution. Therfore, the developed engine control system has been able to control fuel injection and ignition timing more quickly and accurately, Furthermore, the number of misfire reduces during the cold start.

• Journal of Biosystems Engineering
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• 제19권2호
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• pp.91-98
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• 1994

Planting, transplanting, and harvesting are important processes for the successful production of farm products in Korea because those require the high labor intensity during limitted period. Recently, many researches of using automatic control with a microcomputer are carried in the agricultural field, but are not much spread to the seeder development. Automatic sowing technology would be much attractive if there was a way to assure that each seed was count accurately in the seed metering device. Thus, an automatic seed metering device was designed and constructed to be controlled by microcomputer. This device could be improved in not only counting the number of seeds in but also sowing seeds between row spacings. Automatic seed metering device consisted of conveyor belt and temporary storage device. Performance of seed metering device depends on the apparatus including sensor, stepping motor and DC-solenoid. Research contents and results are summarized as follows. 1. The seed metering device involving seed hopper, sorter and temporary storage device was designed and constructed. 2. A seed counting system with six photo electric sensors, designed and built for this project, was adequate for tranferring and counting seeds accurately. 3. Operating algorithm for stepping motor and photo electric DC-solenoid was developed. The Seed metering device proved to be a smooth and accurate operating device using the algorithm. 4. The performance of second prototype metering device was examined with five kinds of seeds ; mung beans, red beans, white beans, black beans and corn to transfer and count the seeds. The error ratio of seed metering was less than 3.5%.

• 한국통신학회논문지
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• 제10권2호
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• pp.69-75
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• 1985

印章識別은 平滑化, 回轉 및 移動, 細線化整合技法의 순서로 수행된다. CCTV카메라에 入力된 印章映像은 A/D變換機와 8bit microcomputer에 의하여 $256{\times}256$畵素의 2進映像으로 변환한다. 두 映像을 定位置로 回轉시킨 후, 細線化過程을 거쳐 文字의 골격선을 찾는다. 畵素거리에 따라 Weight.를 정하고 distance-weighted Correlation, C를 계산한다. 계산된 $C^K$와 결정상수 $C_YES$, $C_NO$를 비교하여 印章을 識別한 결과 95%의 높은 識別率을 얻었고 한 개의 對象印章을 識別하는데 걸린 시간은 3분 이내였다.

• 한국초등과학교육학회지:초등과학교육
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• 제25권4호
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• pp.454-464
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• 2006

The purpose of this study was to develop MBL(Microcomputer Based Laboratory) programs for sixth-grade elementary students in science laboratory instructions and to ascertain the effects of this program on academic achievement and science-related affective characteristics. In laboratory instructions, using the MBL was found to be effective in improving academic achievement for elementary students, especially in the domain of knowledge. In addition, it helped students to improve science-related affective characteristics. The experimental group showed higher levels, especially in the domains of cognition and interest. When our findings were analyzed in detail, the sub-domains that showed positive effects included 'cognition of science' in the domain of cognition, and interest toward science', 'interest toward science learning', 'interest toward science related activities', and 'anxiety for science' in the domain of interest. Male students exhibited improvement in the domain of cognition while female students showed improvement in the domain of interest. In conclusion, utilizing MBL programs as an experimental measurement in the real field of elementary science education can be said to be both positive and desirable.

• Journal of Biosystems Engineering
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• 제10권2호
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• pp.19-26
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• 1985

This study was carried out to develop a versatile data acquisition/processing system for overall tractor performance utilizing a NEC PC-8001 microcomputer. The data acquisition system measures drawbar pull and power, wheel torque and axle power, ground speed, wheel slip, fuel flow, and engine speed. The system stores hexadecimal data for these variables in memory. Upon completion of each test run, all hexadecimal data stored in memory are recorded on floppy disc. The data processing system reads in the data collected on floppy disc and interprete them using several graphical and statistical techniques. The system uses the same microcomputer and a dot-matrix printer. The data acquisition system has been installed on a GOLDSTAR 500 tractor (2WD, 50 ps). A field study has shown that tractor performance data can be quickly and easily collected. It also appeared that the data processing system can be used to efficiently analyze the collected data. The data acquisition system has some troublesome in mounting and handling on tractor since it uses a general-purpose computer consisting of several components.

• 수산해양기술연구
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• 제25권1호
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• pp.29-34
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• 1989

이상과 같은 제어계의 구성방법으로 제어계를 설계할 경우에는 오차신호에 대한 PI제어기와 플란트의 상태피이드백을 아울러 행하는 제어계로 됨을 알 수 있으며, 또한 응답 시뮬레이션 결과로부터 알 수 있듯이 본 연구에서 제안하는 방법으로 제어기를 구성할 경우 양호한 제어가 가능하다. Fig.3의 플로우챠트의 그림에서 점선으로 표시된 실시간제어실험의 프로그램은 구성은 되어 있으나 실제로 실험을 행하지 못한 아쉬움이 있으며, 다음 기회에 이 부분의 실험도 행하고자 한다.

• 한국수산과학회지
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• 제53권6호
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• pp.954-959
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• 2020

This study aimed to verify the effectiveness of rescue apparatus, that can capture crabs using external stimuli such as food and electricity, without relying on divers. In this study, a microcomputer-based controller and an IC-device-based controller were developed, and spot inspection was conducted using 20 modules and 30 sea urchin removal modules. Accordingly, 58, 18, 17, and 74 sea urchins were introduced in the first, second, third and fourth experiments, respectively. The result of evaluating the lure of each removal mechanism, based on the catch per unit effort, with an electrical stimulus was 1.1 (32/10), with a feeding stimulus was 3.4 (100/29), and with electrical and feeding stimuli was 3.5 (35/10).

• 한국멀티미디어학회논문지
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• 제25권4호
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• pp.610-619
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• 2022

Recently, the market for masks has been growing due to air pollution, sun protection, pollen allergies and other reasons. In addition, the demand for masks has increased dramatically due to the new coronavirus from 2020, and masks are still one of the necessities of life. Although the reliance on masks is increasing, there are many inconveniences associated with wearing masks for long periods of time. At the same time, technology is developing rapidly, and the demand for smart wearable devices is increasing. Therefore, at the moment when the fourth industrial revolution is underway, combining people's common necessities with IoT technology to bring new convenient experiences to people is an important direction for future technology development and product development. In this study, smart masks were designed and implemented using IoT(Internet of Things) technology. The mask uses a microcomputer Adafruit circuit playground express, using the microcomputer's LED, optical sensors, can be in the dark place light, and through the temperature sensor real-time grasp of body temperature changes. If the body temperature rises above normal, the LED will turn "on" and activate the voice sensor to warn yourself and others around you.

• Journal of Biosystems Engineering
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• 제7권2호
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• pp.18-29
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• 1983

효율적(效率的)인 농업기계(農業機械)의 실내(室內) 및 실외실험(室外實驗)을 위(爲)하여 Microcomputer에 의(依)한 Data 측정(測定)을 위(爲)해 A/D 변환기(變煥器)를 Interface 시키고, 이를 기록보관(記錄保管)하기 위해 Computer memory인 2716용(用) EPROM programmer와 Microprinter를 interface시켰고, 실험(實驗) 후(後)Data를 다시 HP computer로 전송(傳送)하기 위(爲)한 RS232C 장치(裝置) 등(等)의 Hardware를 구성(構成)하고, 이들의 작동(作動)을 위(爲)한 Microprogram을 개발(開發)하여 Data acquisition system으로 활용(活用)할 수 있는 방안(方案)을 연구(硏究)한 본(本) 연구(硏究)의 주요(主要) 결과(結果)를 요약(要約)하면 다음과 같다. 1. 사용(使用) channel수(數), 측정시간(測定時間) 간격(間隔) 및 측정(測定) data수(數)를 자유(自由)로 조정할 수 있는 측정용(測定用) microprogram을 개발(開發)하였으며 최소(最小) 측정시간(測定時間) 간격(間隔)은 $58.8{\mu}s$이었다. 2. A/D 변환기(變煥器)의 Calibration을 위(爲)해 Function generator에서 삼각파(三角波), 구형파(矩形波), sin파등(波等)을 발생(發生)시켜 Oscillograph에서 확인(確認)하고 이를 계측(計測)하여 보관(保管)한 후(後) HP Computer에 전송(傳送)하여 plotting한 결과(結果) 정확(正確)한 파형(波形)을 얻을 수 있었다. 3. Data 기록(紀錄)을 위(爲)한 EPROM programmer는 잘 동작(動作)하였으며 기록(紀錄) 및 원래(原來)의 Data와 비교(比較)하는 데 총 소요시간(所要時間)은 75초 정도였고, 취급이 용이(容易)할 뿐 아니라 지워서 재사용(再使用)할 수 있어 경제적(經濟的)이었다. 4. Data의 기록(記錄)을 위(爲)한 Microprinter는 그 2kB Decimal로 변환(變換)시켜 Print하는 시간(時間)이 15분(分) 정도이었으며 계측(計測)과 동시(同時)에 기록(記錄)시키는 완속측정용(緩速測定用)으로 적당하였다. 5. 본(本) system과 HP3000 컴퓨터 간(間)의 Data 전송(傳送) 장치(裝置)를 사용(使用)하면 2k byte의 Data를 HP3000 computer로 전송(傳送)하는데 1~2분(分)정도 소요(所要)되었고, 작동(作動)은 만족스러웠다. 6. 사용(使用) 전원(電源)은 DC/DC 변환기(變煥器)를 사용(使用)하여 입력전원(入力電源)이 7~25V로 단일화(單一化)하였으며, 그 상용전류(常用電流)는 1.8A정도로 tractor의 battery를 사용(使用)할 경우도 시동시(始動時)에 전압강하(電壓降下)에 의(依)한 컴퓨터의 오동작(誤動作)이 일어나지 않았으며 야외실험(野外實驗)에서의 적응성(適應性)이 우수하였다. 이상(以上)의 결과(結果)를 종합할 때 본(本) system은 실내(室內) 및 실외(室外) 실험(實驗)을 위(爲)한 Data auquistition system으로 활용(活用)할 수 있으며 경제적면(經濟的面)이나 정말 고속 측정(側定) 면(面)에서 우수한 성능(性能)을 갖춘 것으로 인정(認定)된다.

• 한국과학교육학회지
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• 제28권4호
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• pp.331-339
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• 2008

이 연구의 목적은 중학교 과학수업에 MBL실험 수업을 적용한 후 전통적 실험 수업과 비교하여 어떠한 학습 효과가 있는지 알아보는 것이다. MBL실험 집단은 중학교 2학년 교과서 내용 중 5개 주제의 실험을 MBL실험으로 개발하여 적용하였으며 전통실험 집단은 교과서에서 제시한 방법으로 실험을 실시하였다. MBL실험 수업의 효과를 알아보기 위하여 MBL실험 수업과 전통실험 수업 실시 전에 과학학업성취도, 그래프능력, 과학탐구능력, 과학과 관련된 정의적 영역의 사전 검사를 실시하였고, 수업 처치 후에 사후 검사를 실시하였다. 연구결과 과학학업성취도와 과학탐구능력, 그래프 그리기 능력에서 MBL실험 수업이 전통실험 수업보다 효과가 있는 것으로 나타났다. 또한 MBL실험 수업이 과학과 관련된 정의적 영역에 미치는 효과를 조사한 결과 통제집단이 실험집단보다 통계적으로 유의미하게 높았다. 따라서 중학교 과학실험 수업에 도입초기 단계에 있는 MBL실험이 새로운 실험방법으로 현장 활용 가능성에 대한 긍정적 시사점을 찾을 수 있었다.