• 한국전자파학회논문지
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• 제15권2호
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• pp.217-222
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• 2004

본 논문에서는 AM 대역 디지틸 라디오 방송의 표준안인 DRM 시스템에 효율적인 채널 추정 방식에 대해 비교, 분석하였다. 채널의 다중경로 페이딩을 보상하기 위해 주파수 영역에서 선형 보간법, 이차 보간법, cubic-spline 보간법, time-domain 보간법을 통하여 채널을 추정하였다. 그리고 잡음에 의한 왜곡을 제거하기 위해 채널의 주파수 응답을 시간축으로 평균을 취하였다. 각 보간 방식의 성능 분석을 위해 시뮬레이션을 수행하여 MSE, BER의 성능과 연산의 복잡도를 비교, 분석하였다.

• 말소리와 음성과학
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• 제10권3호
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• pp.31-39
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• 2018

This paper aims to present a taxonomy of non-standard words (NSW) for developing a French text normalization system and to propose a method for evaluating this system based on a corpus. The proposed taxonomy of French NSWs consists of 13 categories, including 2 types of letter-based categories and 9 types of number-based categories. In order to evaluate the text normalization system, a representative test set including NSWs from various text domains, such as news, literature, non-fiction, social-networking services (SNSs), and transcriptions, is constructed, and an evaluation equation is proposed reflecting the distribution of the NSW categories of the target domain to which the system is applied. The error rate of the test set is 1.64%, while the error rate of the whole corpus is 2.08%, reflecting the NSW distribution in the corpus. The results show that the literature and SNS domains are assessed as having higher error rates compared to the test set.

• 전자통신동향분석
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• 제35권3호
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• pp.85-97
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• 2020

In the maritime industry, the convergence of information and communication technology (ICT) occurs in two areas. The first one is the convergence of e-navigation technology to apply ICT to the maritime domain. This was led by EU's initiative and is also being promoted in our country. The other one is the convergence of autonomous ship technology to apply various ICT technologies for commercial purposes. This initiative is being led by maritime industries. In this paper, we describe trends of e-navigation and maritime autonomous surface ship technology convergence. Subsequently, we explain the standardization status of performance and technical standard bodies, international standardization organizations, and related standard-developing organizations to provide the interoperability of these technologies. Finally, we examine ongoing projects in Korea and suggest future directions for their R&D and standardization.

• 디지털산업정보학회논문지
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• 제7권1호
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• pp.173-183
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• 2011

Global logistics including Korea had developed at various fields through the developed IT technology. In addition, in changing into Internet based digital economy times, economic and logistics activities became extending into worldwide over the cross-border. Logistics activity performed by off-line rapidly changed in real environment. But, unfortunately business process modeling about the whole logistics was not happened, even though process modeling had done by transport stages or logistics entities. Therefore, it is difficult to grasp the whole logistics. Additional cost and time was requested due to no association between logistics entities and invisibility. So, this paper has to be process modeling for logistics industry domain. For objective modeling, work area shall be divided and it extracts general work process per each area. And then it defines subprocess of general work process. Cargo tracking in logistics industry domain means to grasp the status and present states at transportation or storage stage. This paper defines business process and data model for electronic processed work area using the UN/CEFACT standard modeling methodology.

• 한국산업정보학회:학술대회논문집
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• 한국산업정보학회 1997년도 추계학술대회 발표논문집:21세기를 향한 정보통신 기술의 전망
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• pp.91-101
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• 1997

The demand for handling images in digital form has increased dramatically in recent years. Digital image compression is required to store and transmit mass information in different from general information. JPEG(Joint Photographic Experts Group) committee founded by CCITT and ISO is define the still-image standard compression/restoration algorithm. JPEG is proposed the standard of grayscale and color still-image compression/restoration. In the image quality, JPEG is applicable to the various applications in which compression is able to from 1/10 to 1/50 without the visible obstacle. In this paper, we proposed that the proposed method enhance the compression ratio which is reducing the higher frequency in order to increasing the spatial redundancy in the image. The proposed method is using the low pass filter in order to reducing the higher frequency. The low-pass filters are using the median filter and convolution filter in the spatial domain, FFT filter in the frequency domain. We acquired the additive compression ratio reducing the higher frequency using the low-pass filter.

• ETRI Journal
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• 제37권3호
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• pp.439-449
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• 2015

Human body communication (HBC) is being recognized as a new communication technology for mobile and wearable devices in a body area network (BAN). This paper presents co-channel interference experienced by HBC supporting the physical layer in the IEEE 802.15.6 BAN standard. To analyze the co-channel interference, a co-channel interference model is introduced, and space-domain and time-domain parameters representing an interference environment are generated using the co-channel interference model. A new signal-to-interference ratio (SIR) parameter depending on the peak amplitudes of the data signals causing co-channel interference is defined; co-channel interference can be easily analyzed and modelled using the newly defined SIR. The BER degradation model derived using the co-channel interference model and SIR in this paper can be effectively used to estimate the performance.

• 한국컴퓨터정보학회논문지
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• 제21권9호
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• pp.85-90
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• 2016

In this paper, we study the domain-independent sensor data structuring method and the derivations about ' Filter Criteria' expansion factors of heterogeneous domain systems. For this purpose, we propose a 5W1H based information search and retrieval method without knowledges about the target domains. And we also suggest a resource management model that can support expanding search of information. By the suggested method, the oneM2M standard able to implement the use-cases like 'data exchanging between the heterogeneous domains'.

• 간호행정학회지
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• 제9권1호
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• pp.5-18
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• 2003

Purpose : For improvement of nursing services in ambulatory unit, ambulatory nursing activity was identified and the required time by nursing activity was measured. Method : The data were collected from 4 tertiary hospitals and 2 secondary hospitals. The method of data collection was used the self-reporting method. The 123 nurse-work days and 137 nurse-aid-work days in 6 hospitals were analyzed. Results : As a result, 11 ambulatory nursing domains and 79 ambulatory nursing activities were confirmed. Above 50% of subjects performed the general outpatient affair domain. The percentage of total time spent in each domain were as follows : general outpatient affair domain, 58.3%, patient education ${\cdot}$ counseling domain, 10.8%, therapeutic care domain, 8.6% and so on. And the average hours were measured by activity and domain. Conclusion : For the improvement of ambulatory nursing care, the strategies that keep the legal standard of number of ambulatory nurse and exchange the nursing-aid for the nurse is needed. And it is also needed to standardize the ambulatory nursing services.

• 대한공업교육학회지
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• 제33권1호
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• pp.92-113
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• 2008

이 연구의 목적은 공업고등학교 공작기계 과목의 CNC 선반 실습 표준 수행 평가를 위한 기준을 개발하는 데 있다. 이 연구에서는 CNC 선반 실습을 실시하고 있는 경기도내 13개 공업고등학교(공립 11개교와 사립 2개교)의 CNC 선반 수행 평가 기준을 수집, 분석하여 CNC 선반 실습 표준 수행 평가 기준을 개발 하였다. 경기도내 13개 공업고등학교에서 조사하여 작성한 CNC 선반 실습 표준 수행 평가 기준을 CNC 선반 실습 현장 교사 26명(각 학교별 2명씩)에게 타당성을 검증 받았다. 그 검증값은 평균 3.77 ~ 4.77로 타당도가 매우 높은 것으로 나타났다. 이 연구에서 개발한 평가 도구의 특징은 다음과 같다. 첫째, 공업고등학교 학생들의 CNC 선반 실습에 대한 기능적인 영역뿐만 아니라 인지적 영역, 정의적 영역까지를 평가할 수 있도록 평가 기준을 개발하였다. 둘째, CNC 선반 실습 교과에 대한 평가 영역을 전 실습 과정에 대하여 세분화 하였으며, 교사와 학생이 함께 평가할 수 있는 객관적 평가 방법을 택하였다. 셋째, 개발된 CNC 선반 실습 표준 수행 평가 기준은 일선 현장에서 지도하고 있는 교사들로부터 타당성을 검증 받았기 때문에 타당도와 신뢰도가 높다고 할 수 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 심포지엄 논문집 정보 및 제어부문
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• pp.128-130
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• 2005

This paper proposes a modified IMC-PID controller that introduces controlling factor of the system identification to the standard IMC-PID controller in order to meet the design specifications such as gain, phase margin and maximum magnitude of sensitivity function in the frequency domain as well as the design specifications in time domain, settling, rising time and overshoot, and so on.