• 정보학연구
• /
• 제7권2호
• /
• pp.77-92
• /
• 2004

전자무역은 종래의 서류거래 대신 EDI나 인터넷 등 컴퓨터 네트워크를 이용하여 전자적 데이터 메시지를 송수신하여 종래의 무역거래방식에 컴퓨터와 정보통신기술을 결합시킨 새로운 형태의 무역거래를 말한다. 따라서, 본고에서는 무역결제 및 무역운송을 중심으로 무역거래의 전자화 현황을 살펴본 향후 전자무역의 활성화 방안을 제안하고자 한다.

• 마이크로전자및패키징학회지
• /
• 제8권2호
• /
• pp.43-48
• /
• 2001

Economical consumption of energy, longer life of lamps, higher lighting comfort and new aesthetic of illumination is subject of numerous research and development works. The halogen lamps are an example of positive solution some of above mentioned problems. The electronic transformers are more frequent used for their supply. In comparison with conventional transformers they have less weight, less volume and 60% less power losses. Their advantages are particular visible, when the hybrid technique is applied. The paper presents the results of engineering research and development works carried out in Private Institute of Electronic Engineering, in R. & D. Center for Hybrid Microelectronics and Resistors and in Technical School of Communications in Krakow, in the field of the design and exploitation tests of hybrid converters 220V AC /12V DC (electronic transformers) and electronic ballasts destined for the supply of halogen lamps 20W to 150W and fluorescent lamps respectively. To perform the converters, thick film technology and surface mount technology were used. For the protection of converter electronic circuit the thick film temperature sensor and transistors were applied. Moreover the paper presents the base application circuits of elaborated converters, their technical parameters and exploitation results. The development perspectives of such domain of hybrid circuits are also discussed.

• Journal of Communications and Networks
• /
• 제15권5호
• /
• pp.496-503
• /
• 2013

In an orthogonal frequency division multiplexing system, conventional interpolation techniques cannot correctly balance performance and overhead when estimating dynamic long-delay channels in single frequency networks (SFNs). In this study, classical filter analysis and design methods are employed to derive a complex interpolator for maximizing the resistible echo delay in a channel estimator on the basis of the correlation between frequency domain interpolating and time domain windowing. The coefficient computation of the complex interpolator requires a key parameter, i.e., channel length, which is obtained in the frequency domain with a tentative estimation scheme having low implementation complexity. The proposed complex adaptive interpolator is verified in a simulated digital video broadcasting for terrestrial/handheld receiver. The simulation results indicate that the designed channel estimator can not only handle SFN echoes with more than $200{\mu}s$ delay but also achieve a bit-error rate performance close to the optimum minimum mean square error method, which significantly outperforms conventional channel estimation methods, while preserving a low implementation cost in a short-delay channel.

• 한국전기전자재료학회논문지
• /
• 제33권2호
• /
• pp.123-129
• /
• 2020

We analyzed the drift current by charged particles according to the loading methods applied into a closed cell by electronic ink at a reflective-type display panel using an electrophoretic mechanism. For this experiment, various panels were fabricated with injection voltages for electronic ink taking values in the range -4~0 V. The size of each cell was 220 ㎛ × 220 ㎛ and height of the barrier rib was 54.28 ㎛. The electronic ink was fabricated by mixing electrically neutral fluid and single-charge white particles. Drift current was measured by moving charged particles. A biasing voltage of 6 V was applied to the display panel. As a result, the drift current was proportional to the injection voltage for electronic ink, but it decreased in case of an injection voltage above -3 V. Our experimentation ascertained that the concentration of charged particles injected into closed cells is controlled by the injection voltage and the selective injection of charged particles above movable q/m is possible.

• ETRI Journal
• /
• 제35권4호
• /
• pp.706-709
• /
• 2013

As an alternative to the traditional pilot-aided orthogonal frequency division multiplexing (OFDM), the time-domain pseudonoise (PN)-padded OFDM provides a higher spectral efficiency. However, the carrier frequency offset (CFO) attenuates peaks of the conventional PN correlation output, which limits the CFO estimation range of the OFDM synchronizer. An improved correlation is proposed in this letter to remove the CFO-induced amplitude attenuation of correlation peaks. For a synchronizer adopting the designed correlator, a larger range of CFO acquisition is obtained through using wider correlation windows with a smaller interval between them. The proposed method of CFO acquisition is verified in a digital terrestrial multimedia broadcast receiver, in which the synchronizer is able to acquire CFOs up to ${\pm}320$ kHz in the DVB-T F1 channel. Furthermore, the acquisition range can be expanded in more favorable channels.

• 한국기록관리학회지
• /
• 제5권2호
• /
• pp.49-72
• /
• 2005

본 연구의 목적은 전자기록의 계층구조와 유형을 조사 분석하고, 전자기록의 각 계층 중 관리에 가장 기본이 되는 계층인 기록철(records folder)의 관리방안을 제시하는 것이다. 이를 위해 영국의 "전자기록관리시스템을 위한 기능요건"을 기준으로 전자기록의 계층모형 및 기록철 관리방안을 분석하였다. 또한 이 표준에서 제시한 전자기록의 계층구조를 가상의 사례에 적용해봄으로써 각 계층의 의미를 분명히 설명하고자 하였다. 이러한 선진사례 분석을 토대로, 우리나라 분류체계에서 전자기록철의 개념 도입 시 고려해야할 점, 전자기록철의 개시와 종결 기준 설정, 전자기록권(part) 개념의 도입 등을 중심으로 시사점을 정리하였다.

• 한국문헌정보학회지
• /
• 제37권2호
• /
• pp.365-385
• /
• 2003

전자도서와 관련된 분야는 빠르게 변화하고 있으며 관련된 행사, 문헌, 기사 등과 관련된 최신 정보를 유지하는 것은 쉬운 일이 아니다. 전자도서는 PC혹은 휴대용 단말기를 통하여 열람하므로 스크린의 질에 다소 제한적인 요소를 갖고 있으나 휴대용 단말기의 가격은 점진적으로 저렴하게 되고 질은 높아지므로 전자도서의 미래는 긍정적이라 할 수 있다. 본 연구에서는 최근의 전자도서 관련 행사, 기술 등과 관련된 배경 지식을 기반으로 전자도서를 분류하여 관련 추세를 분석하였다. 또한 본 연구에서는 대학도서관에서 전자도서를 도입하는 경우 이와 관련된 여러 환경과 이슈를 파악하여 전자도서의 도입과 운영시 고려하여야 하는 요소를 구분하여 그 해결책과 미래의 추세를 제시하고자 하였다.

• International Journal of Computer Science & Network Security
• /
• 제22권12호
• /
• pp.139-145
• /
• 2022

The study aimed to build a proposed program for training Social Studies teachers in the light of electronic functional competencies, the researcher used the experimental method with a quasi-experimental design, the study sample consisted of (37) Social studies teachers in Ismailia. A proposed program in the light of electronic functional competencies. A measure of awareness of the dimensions and components of electronic feasibility. The study concluded several results: There is a statistically significant difference at the level of (a ≤0.01) between the average scores of the teachers of the research group in the pre and post measurements of the measure of awareness of the dimensions and components of electronic functional competencies in favor of the teachers scores in the post-measurement. Training Social studies teachers on the functional electronic competencies necessary for them to keep up with educational developments.

• International Journal of Computer Science & Network Security
• /
• 제24권4호
• /
• pp.135-140
• /
• 2024

The main purpose of the study is to determine the key aspects of the use of electronic educational resources in the training of future specialists in higher education institutions. The importance of using electronic educational resources in the preparation of university students is proven. The relevance of the chosen topic is due to the high rise of globalization in the process of training future specialists in higher education institutions. The theoretical and methodological basis of the article is the fundamental and modern provisions of the theory, the work of scientists and specialists in the management of electronic educational resources in the field of education. Based on the results of the analysis, the main characterizing aspects of the use of electronic educational resources in the training of future specialists in higher education institutions were identified. Further research needs to analyze new, experimental electronic means in the system of student training.

• Journal of the Optical Society of Korea
• /
• 제17권1호
• /
• pp.109-109
• /
• 2013