• 한국산업정보학회논문지
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• 제27권6호
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• pp.59-68
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• 2022

우리는 자동차 소유자에게 자동차 소모품의 교체 주기를 알려주는 자동차 유지관리 지원 장치를 제안한다. 소모품 교체 주기를 놓친다면 차량의 상태가 악화되기 때문에 권장 기간 내에 소모품을 교체하는 것이 중요하다. 자동차 유지관리 지원 시스템은 설치된 차량의 주행 거리를 기준으로 차량 소유자가 정하는 교체 시간을 알려준다. 이 시스템은 On Board Diagnostics-II 포트에 노출된 Electronic Control Unit과 계기판 사이의 통신을 위해 Controller Area Network 인터페이스에서 획득한 속도 정보를 통합하여 차량 주행 거리를 계산한다. 이를 통해 시스템에 추가 배선이 필요하지 않다. 시스템의 주행 거리를 차량의 계기판과 비교하여 시스템의 오차가 0.28%에 불과하다는 것을 확인하였다. 자동차의 일반적인 조건으로는 무시할 수 있는 15mW를 소비하는 저전력 모드로 자동으로 진입해 점화 스위치가 꺼졌을 때 차량 배터리가 방전되는 것을 방지한다.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2021년도 춘계학술대회
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• pp.377-379
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• 2021

2006년에 진행한 초등학교 특수학급 음악치료에 대한 특수교사와 음악치료사의 인식 조사 논문에 따르면 특수교육에 대한 지원이 확대되며 치료 교육에 대한 학부모들의 수요 또한 늘어나는 것이 확인되었고, 2018년 특수학교의 음악교육 실태조사 연구논문에서 음악실과 기자재구비는 상승하였으나, 이동이 힘들거나, 동시 수업으로 인한 다양한 악기가 부족한 것을 확인하였다. 본 연구는 악기를 이용한 자폐성 장애 아동의 사회성 향상 교육을 위한 하드웨어 및 소프트웨어를 결합한 모듈 개발을 진행하였다. 피에조 센서와 아두이노를 이용하여 다양한 악기 소리를 설정하여 간단한 조작으로 여러 악기를 체험할 수 있고 모듈화를 통하여 음악 치료를 위한 악기를 설계하였다. 이 연구를 통해 장애 아동의 음악 치료에 도움이 되길 기대한다.

• 한국전기전자재료학회논문지
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• 제23권6호
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• pp.497-501
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• 2010

Nano structure $Bi_2Te_3$ films were deposited on (100) GaAs substrates using a modified MOCVD system and the effect of growth parameters on the structural properties were investigated. Different from conventional MOCVD systems, our reactor consist of pressure control unit and two heating zones ; one for formation of nano-sized particles and the other for the growth of nano particles on substrates. By using this instrument we successfully grow $Bi_2Te_3$ films with nano-grain size. The film grown at high reactor pressure has large grain size. On the contrast, the grain size decreases with a decrease in pressure of the reactor. Here, we introduce new growth methods of nano-grain structured $Bi_2Te_3$ films for high thermoelectric figure of merit.

• International Journal of Precision Engineering and Manufacturing
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• 제8권2호
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• pp.54-58
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• 2007

This paper describes an atomic force microscope (AFM)-based instrument for measuring the nanoscale cutting edge profiles of diamond cutting tools. The instrument consists of a combined AFM unit and an optical sensor to align the AFM tip with the top of the diamond cutting tool edge over a submicron range. In the optical sensor, a aser beam is emitted from a laser diode along the Y-axis and focused to a small beam spot with a diameter of approximately $10{\mu}m$ at the beam waist, which is then received by a photodiode. The top of the tool edge is first brought into the center of the beam waist by adjusting it in the X-Z-plane while monitoring the variation in the photodiode output. The cutting tool is then withdrawn and its top edge position at the beam center is recorded. The AFM tip can also be positioned at the beam center in a similar manner to align it with the top of the cutting edge. To reduce electronic noise interference on the photodiode output and thereby enhance the alignment accuracy, a technique is applied that can modulate the photodiode output to an AC signal by driving the laser diode with a sinusoidal current. Alignment experiments and edge profile measurements of a diamond cutting tool were carried out to verify the performance of the proposed system.

• 대한원격탐사학회지
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• 제18권1호
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• pp.53-59
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• 2002

The MSC is a payload on the KOMPSAT-2 satellite to perform the earth remote sensing. The instrument images the earth using a push-broom motion with a swath width of 15 km and a GSD(Ground Sample Distance) of 1 m over the entire FOV(Field Of View) at altitude 685 km. The instrument is designed to haute an on-orbit operation duty cycle of 20% over the mission lifetime of 3 years with the functions of programmable gain/offset and on-board image data compression/storage. The MSC instrument has one channel for panchromatic imaging and four channel for multi-spectral imaging covering the spectral range from 450nm to 900nm using TDI(Time Belayed Integration) CCD(Charge Coupled Device) FPA(Focal Plane Assembly). The MSC hardware consists of three subsystem, EOS(Electro Optic camera Subsystem), PMU(Payload Management Unit) and PDTS(Payload Data Transmission Subsystem) and each subsystems are currently under development and will be integrated and verified through functional and space environment tests. Final verified MSC will be delivered to spacecraft bus for AIT(Assembly, Integration and Test) and then COMSAT-2 satellite will be launched after verification process through IST(Integrated Satellite Test). In this paper, the introduction of MSC, the configuration of MSC electronics including electrical interlace and design of CEU(Camera Electronic Unit) in EOS are described. MSC Operation parameters induced from the operation concept are discussed and analyzed to find the influence of system for on-orbit operation in future.

• 지역사회간호학회지
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• 제31권3호
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• pp.322-336
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• 2020

Purpose: This study aimed to investigate the current state and trends of health literacy research considering migrants living in South Korea. Methods: A review of the literature was conducted using electronic data base and citation tracking. A total of 82 articles were identified, of which 16 articles that met the inclusion criteria were selected for review. Two authors reviewed the articles independently using a matrix table and then examined four aspects of the studies jointly: research method, immigrant characteristics, health literacy assessment, and main findings. Results: Most of the articles (n=13) were descriptive studies and three were methodology studies for instrument development. Of the 13 studies, eight involved female immigrants, four of health literacy involved migrant workers, and four concerned North Korean Refugees. A total of eight types of health literacy assessment tools were used. Sufficient samples and sampling methods were lacking at the population level. Conclusion: The results of the review generally showed that the health literacy of immigrants was lower than that of native South Koreans, and that there was a difference between nationality and gender among immigrants; however, further research is needed to review a larger sample with a validated instrument.

• 대한안전경영과학회지
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• 제14권2호
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• pp.49-54
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• 2012

As all kind of industry has developed, metal structure and machine instrument use bolt, pin, rivet and welding for assembly and combination. For pin and hinge, dimension accuracy is crucial to keep the operation and safety of the structure and machine instrument. In case of complex machine, the hinge for cover open-loop system is one of the significant design elements. Most of the hinges are being imported and assembled sine they give high technology development cost for its unit cost position. The reason is that the localization of hinge is inadequate. As the demand increase and the necessity of localization grow, it is now more important than ever to develop low cost structure. By the low cost structure, a new technology could be obtained for electronic product and structural hinge since it would enable for complex machine hinge to be guaranteed, technologically. Open-loop hinge is the link type and designed for the structure to keep constant open-loop. And, the hinge is examined in design stability by finite element analysis method. In this paper, the operation result is presented when the hinge for complex machine open-loop is designed for link type structure.

• 한국정보전자통신기술학회논문지
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• 제4권4호
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• pp.264-271
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• 2011

항공기의 계기착륙을 유도하는 시스템인 ILS(Instrument Landing System)는 1947년 ICAO(International Civil Aviation Organization)에서 국제표준으로 채택되어 현재는 상용시스템으로 출시되고 있다. 본 논문에서는 통합형 ILS 디지털 송수신 모듈의 설계방법을 제안하였다. 새롭게 제안한 것은 FPGA를 이용한 디지털 이중 AM 변복조기, 샘플링 클럭 생성을 위한 DDS(Direct Digital Synthesizer), DDC(Digital Down converter) 구조의 복조기, DSP 칩을 이용한 AM 스펙트럼 분석기의 디지털 설계 기법이다. 제안한 설계 방법의 유용성을 모듈 개발 및 실험을 통해 확인한 결과, 성능이 우수한 상용 시스템으로의 활용이 가능함을 확인하였다.

• 영어어문교육
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• 제12권1호
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• pp.29-54
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• 2006

The purpose of this study is two-fold: first, to examine the current status of e-dictionary use in Korea and the attitude toward its use by Korean college students; second, to investigate to what degree e-dictionaries may be useful and effective tools in helping to improve learners' overall English skills. The subjects were 84 college students and they were divided into two groups: the experiment group and the control group. The instrument employed was the Preliminary Student Usage Questionnaire, which was developed by the researcher, together with the questionnaire survey developed by Koyama and Takeuchi (2004), which was modified for the study. The findings from this research are as follows: First, a special instruction session on how to use e-dictionaries made a statistically significant difference among users of the dictionaries. Those subjects who had received the instruction displayed a more positive attitude toward the use of e-dictionaries. Second, the experiment group showed a more favorable attitude toward the use of e-dictionaries. On the basis of the above results, the researcher suggests that proper guidance on the use of e-dictionaries and their benefits should have a positive influence on users. The findings from the current research will shed light on the current status of electronic dictionary use among Korean college students.

• 한국연초학회지
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• 제35권1호
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• pp.20-27
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• 2013

An Electronic Nose(E-Nose) and Gas Chromatography/Mass Spectroscopy (GC/MS) are meanwhile conventional technique to analyze volatile materials in many industries (e.g., food, medicine, environment) and have broad acceptance in the analysis of tobacco products. In this study, an experiment where tin oxide gas sensor array responses and GC/MS profiles are used to characterize the volatile compounds of different cigarettes at the same time is performed and the measurements of two instruments are compared for cigarette samples with a known chemical information. E-Nose and GC/MS were employed to differentiate and match flavored cigarettes with commercial tobacco flavoring agents (lavender, vanilla, peppermint, orange, star anise). For verifying reliability of two systems, the analyses were conducted in terms of amount of flavors in each cigarettes using partial least squares (PLS) and with the principal components analysis (PCA). Various chemical sensors and GC/MS data was reduced into two principal factors (PC1, PC2) for being distinguished with visualized regions. Both systems provided adequate results for odor characteristics of cigarettes in this study with each instrument having its own advantages and disadvantages.