• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2005년도 ICCAS
• /
• pp.320-323
• /
• 2005

This paper discusses heat problem of IC, which composes the electronic instruments, to guarantee reliability of electronic instruments. And also proposes the unified equivalent model for various electronic instrument products to guarantee reliability and life of its parts. Because electronic instruments are down sizing and operated with high frequency, the internal temperature of electronic instruments is rising steadily. The internal temperature of the electronic instruments gives a big effect to electronic instrument's reliability and life. The semiconductor parts are the representative heat generation parts because of its complicated function, high frequency and high density. Consequently, guaranteeing reliability and life of electronic semiconductor is the important start point in securing the reliability and life of the electronic instrument product. Unfortunately, there are many factors, which affect heat dissipation efficiency. The heat dissipation efficiency follows the environment where the electronic instrument products are used. Therefore it is very difficult to define reliability and life of the electronic manufactures. Electronic instrument products are composed of printed circuit board (PCB), integrated circuit (IC), resistance, and capacitor and so on. And there are superposed thermal resistances, because the parts are arrayed on the printed circuit board (PCB), Therefore the total thermal resistance is variable. Consequently it cannot have same thermal model for each electronic instrument products. In the next part, we propose the unified equivalent model for various electronic instruments. And using the proposed equivalent model proofs the method for analysis reliability of electronic parts.

• 한국조명전기설비학회:학술대회논문집
• /
• 한국조명전기설비학회 2004년도 춘계학술대회 논문집
• /
• pp.456-459
• /
• 2004

Generally, instrument transformer of the core type have been used for measuring current. Because instrument transformer has defects, electronic instrument was appeared. Electronic instrument has many merit-linearity, small size, low cost, etc. Rogowski coil is typical electronic CT and R-divider is typical electronic VT. This paper is introduced a basic concept and theory of electronic current transformer, electronic voltage transformer.

• 한국멀티미디어학회논문지
• /
• 제15권1호
• /
• pp.51-62
• /
• 2012

본 논문에서는 초등학교 저학년 학생들이 쉽고 효율적으로 건반악기 연주 방법을 학습할 수 있도록 개발한 악기 자율학습기를 설명한다. 개발한 악기 자율학습기는 PC기반의 학습 소프트웨어와 외장 전자건반악기 모듈로 구성된다. 우리는 USB 인터페이스를 적용한 전자건반악기와 PC용 S/W를 연동하여 악기 연주에 필요한 정보를 PC 화면에 제공하는 기능과 타자연습과 유사한 형식의 게임을 통해 학습내용을 재미있게 복습하는 기능을 구현하였다. 개발한 외장 전자건반모듈은 USB 인터페이스를 통하여 PC로부터 선택적으로 악기연주 안내정보를 수신하여 LED 및 7-세그먼트에 표시해줌으로써 초보자들이 쉽게 악보 내 음계와 건반의 상관관계를 숙지할 수 있도록 하였다. 또한 사용자가 건반을 잘못 눌렀을 때 이를 감지하여 LED와 PC 화면에 안내정보를 출력하도록 구현하였다. 구현된 악기 자율학습기를 이용한 악보 연주 실험을 통하여 학습효율이 향상됨을 확인하였다.

• 한국전자통신학회논문지
• /
• 제9권9호
• /
• pp.999-1004
• /
• 2014

본 논문에서는 초보자들도 건반악기의 연주 방법을 쉽고, 효과적으로 학습할 수 있도록 건반악기 자율 학습 시스템을 개발하였다. 본 연구에서 개발한 지능형 건반악기 자율 학습시스템은 스마트폰 기반의 학습 어플리케이션과 건반악기 보조 모듈로 구성된다. 건반악기 보조 모듈은 스마트폰 어플리케이션과 블루투스 통신을 통하여 악기 연주 정보를 수신한 후, LED에 표시해 줌으로써 초보자도 쉽게 건반과 음계의 상관관계를 숙지할 수 있도록 하였다. 또한 사용자의 연주정보를 저장하고, 분석 정보를 제공하여 효과적인 학습이 가능하도록 구현하였다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 제38회 하계학술대회
• /
• pp.760-761
• /
• 2007

Instrument transformers provide the reproduction of the primary current or voltage to the measuring and protecting devices. The errors of an iron-cored transformer are caused by the difference between the primary and secondary currents due to the hysteresis characteristics of the iron-core. An error compensating algorithm for instrument transformer can improve the accuracy of conventional current and voltage transformers. This paper describes the performances of the electronic current and voltage transformers mounted an error compensating algorithm. The test results of the electronic transformers in Korea Electrotechnology Research Institute(KERI) are presented.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 하계학술대회 논문집 A
• /
• pp.310-312
• /
• 2004

Generally, instrument transformer of the core type have been used for measuring current. Because instrument transformer has defects, electronic instrument was appeasred. This paper is introduced a basic concept and thoery of electronic instrument and described the the simulation of core type CT and no saturation CT. The evaluation of CT models implemented using EMTP(Electro Magnetic Transients Program) was carried out. The result of comparison both core type CT and no saturation CT are presented.

• 한국컴퓨터정보학회논문지
• /
• 제16권11호
• /
• pp.85-93
• /
• 2011

음악교육은 창의력, 사회성, 학업 성취도를 향상시킨다. 음악교육에 있어서 학습자들이 수동적으로 지식을 전달 받기보다는 자기 수준에 맞는 내용을 선택하여 자신의 학습속도에 맞춰 스스로 학습할 수 있는 학습자 중심의 교육이 강조되고 있다. 이에 따라 자신의 학습 수준, 속도에 맞게 학습할 수 있는 학습도구의 개발이 요구되고 있고, 특히 자율학습이 가능한 전자 악기 HW, SW에 대한 요구가 높아지고 있다. 그러나 기존의 전자악기와 PC MIDI를 이용한 software들은 초등학교 저학년 학생들이 악기연주 자율학습에 활용하는데 어려움이 있다. 본 논문에서는 이들 문제점들을 해결하기 위해 PC 환경에서 PC와 USB Interface로 통신 가능한 외장 전자 건반악기와 PC 기반 software로 구성되는 악기연주 자율학습 지원도구 구현방법을 제안한다. 외장 전자건반모듈은 USB를 지원하는 PIC18F4550 MCU를 활용함으로써 간결한 구조와 저비용으로 구현하였다. 그리고 PC상에서 수행되는 software는 악보편집, MIDI정보 처리, 외장 전자건반모듈과의 상호연동을 통하여 건반악기와 유사한 환경을 지원함으로써 향후 자율학습용 컨텐츠가 추가될 경우 전자건반악기 연주 자율학습에 활용이 가능하다고 판단된다.

• Journal of Electrical Engineering and Technology
• /
• 제12권2호
• /
• pp.904-910
• /
• 2017

This paper presents temperature measurement of solar photovoltaic modules using the custom-made system composed of an infrared temperature sensor and a microcontroller. The obtained measurement results are processed, displayed and stored on a PC using the custom-made virtual instrument. The proposed system overcomes some of the problems related to the contact sensor application, and at the same time offers accurate readings and better flexibility. The proposed system is especially suitable for applications where the cost is a limiting factor in the choice of measuring system. The conducted analysis and the obtained results have shown an excellent accuracy of the proposed system in comparison to a high quality thermal imaging camera used as the reference instrument.

• 기술혁신학회지
• /
• 제1권1호
• /
• pp.96-105
• /
• 1998

Electronic cash affects central bank in many areas, in particular regarding the issuance of money, supervision of cashless payments, supervision of the banking system and monetary policy. The effects of electronic cash on central bank policies, the security and integrity of the payment system, and naturally also on single sector such as company engaged in the transport of money and valuables, depend mainly on the extent to which the new payment methods can replace cash. The possible development of electronic cash merits special attention from central banks for at least three reasons. First, central banks are concerned that the introduction of the new payment instrument should have no adverse effect on public confidence in the payment system and payment media. Second, although the substitution of electronic cash for other forms of money should not theoretically hamper central bank's ability to control the money supply, it might, however, have practial implications, at least in the long run, which need to be carefully examined. Third, because electronic cash may be used for payments of very small value, they have the potential, more than any other cashless instrument, to take over the role of notes and coins in the economy and, therefore, have implications for central bank's activities and revenues.

• 한국전기전자재료학회논문지
• /
• 제24권12호
• /
• pp.935-938
• /
• 2011

The etching characteristics of ZnO and etch selectivities of ZnO to $SiO_2$ in $SF_6$/Ar plasma were investigated using Inductively-coupled-plasma (ICP). The maximum etch rates of ZnO were 6.5 nm/min at $SF_6$(50%)/Ar(50%), Source power (700 W), Bias power (250 W), Working pressure(8 mTorr). The etch rate of ZnO showed a non-monotonic behavior with increasing from 0% to 50% Ar fraction in $SF_6$/ Ar plasma. The plasma diagnostic were characterized using Optical Emission Spectroscopy (OES) analysis measurements.