• 한국인터넷방송통신학회논문지
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• 제17권5호
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• pp.111-117
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• 2017

본 논문은 능력중심사회를 구현하고 산업현장과 교육, 훈련, 자격제도의 불일치 문제를 해결하기 위한 국가직무능력표준과 부합되어 취업현장에서 발생하는 재교육과 사회적비용등의 근본적 문제점을 해결하기 위한 인프라로 한국형 NCS직업기초능력평가시스템을 설계하고 부가적으로 시스템의 기술성능 표준지표를 개발하여 한국형 NCS직업기초능력시스템의 해외진출 성과를 창출하기 위한 연구이다. NCS직업기초능력시스템은 컴퓨터, 태블릿PC, 스마트폰등의 멀티디바이스에 적절한 반응형으로 개발되어지며 글로벌 보급을 위하여 연계대상 운영체제, 인터페이스 프로토콜, 패킷포맷, 암호화, Class Component, 동시접속 수, 감독관-수검자 응답속도, 서버-관리자 응답속도, 응시답안 자동복구 속도, 실시간 답안전송 속도의 국제적 표준에 부합되는 10개 성능평가 지표를 설계하고 개발한다.

• 한국식품과학회지
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• 제12권3호
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• pp.205-208
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• 1980

제빵 적성면(適性面)에서 본 우리나라 소백 품종의 단백질(蛋白質) 및 아미노산 조성상(組成上)의 특징(特徵)은 다음과 같다. 1. 국산 소맥분의 단백질 함량은 미국산 제빵용 소백분에 비해 상당히 떨어지는 10%미만으로서 제빵용으로는 약간 부족(不足)한 단백질 함량을 보였다. 2. 우리나라 소맥 품종의 아미노산 조성상(組成上)의 특징(特徵)으로는 제빵적성에 영향을 미친다고 알려져있는 g1utamic acid의 경우 미국산(美國産) 제빵용 소맥분에 비해 약간 낮은 것으로 나타났으며 단위시료중(單位試料中) 함양(含童)으로는 약 25%의 낮은 수준을 보였다. 3. 국산소맥의 proline 및 cystine의 조성(組成)은 미국산 제빵용 소맥분과 비슷한 수준을 보였으며 lysine, ammonia와 aspartic acid의 경우는 약간 높은 수준을 보였고, 필수아미노산 조성(組成)은 약간 낮은 경향을 보였다. 4. 일반적으로 국산소맥의 단백질 함량 및 아미노산 조성(組成)은 미국산 제빵 및 제과용 소맥분의 중간(中間)에 위치하는 것으로 나타났으며 국산 소맥중에서는 영광(永光)이 미국산 제빵용 소맥분에 가까운 것으로 나타났다.

• Journal of Communications and Networks
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• 제14권6호
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• pp.653-661
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• 2012

High-availability seamless redundancy (HSR) is a redundancy protocol for Ethernet networks that provides two frame copies for each frame sent. Each copy will pass through separate physical paths, pursuing zero fault recovery time. This means that even in the case of a node or a link failure, there is no stoppage of network operations whatsoever. HSR is a potential candidate for the communications of a smart grid, but its main drawback is the unnecessary traffic created due to the duplicated copies of each sent frame, which are generated and circulated inside the network. This downside will degrade network performance and might cause network congestion or even stoppage. In this paper, we present two approaches to solve the above-mentioned problem. The first approach is called quick removing (QR), and is suited to ring or connected ring topologies. The idea is to remove the duplicated frame copies from the network when all the nodes have received one copy of the sent frame and begin to receive the second copy. Therefore, the forwarding of those frame copies until they reach the source node, as occurs in standard HSR, is not needed in QR. Our example shows a traffic reduction of 37.5%compared to the standard HSR protocol. The second approach is called the virtual ring (VRing), which divides any closed-loop HSR network into several VRings. Each VRing will circulate the traffic of a corresponding group of nodes within it. Therefore, the traffic in that group will not affect any of the other network links or nodes, which results in an enhancement of traffic performance. For our sample network, the VRing approach shows a network traffic reduction in the range of 67.7 to 48.4%in a healthy network case and 89.7 to 44.8%in a faulty network case, compared to standard HSR.

• KIEAE Journal
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• 제12권3호
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• pp.41-46
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• 2012

The building envelope is important specially for saving energy consumption of residential buildings. but Apartment houses in Korea commonly have inside insulation system which have constantly arisen thermal bridges, the risk of heat loss, as a necessity. This study aims to evaluate integrated insulation performance according to the different shapes of external walls, adjacent to windows. The thermal performance analysis was carried out by Equivalent U-value and using the three-dimensional heat transfer computer simulation (TRISCO-RADCON), under nine different cases of comparing among three each of different bases(current standard model, 30percent energy saving model and 60percent energy saving model). The heating and the cooling load were also compared between two cases (standard U-value and Equivalent U-value) of three each of different bases, using the Building energy simulation which is based on DOE-2.1 analysis. As results, it turns out that if the Equivalent U-value is considered on the envelope analysis, the heat flow loss will be increasing more than the standard U-value, and if heat insulation property of the residential building reinforced rather than current, the rate of influences on the thermal bridges would be extremely expanded. In addition, it is shown that annual heating loads of the apartment house with applied Equivalent U-value substantially increased by more than 15 percent compared to those with the existing U-value, but annual cooling loads were negligibly affected.

• 터널과지하공간
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• 제32권5호
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• pp.327-343
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• 2022

본 연구에서는 노천 및 지하 광산의 트럭 운반 작업에 대한 데이터를 기록하고, 이를 이용하여 운반 작업의 성능을 평가할 수 있는 표준 트럭 작업 일지를 개발하였다. 국내에서 가행 중인 5곳의 광산에서 활용하고 있는 작업 일지를 확보하여 분석을 수행하였고, 작업 일지에 포함되어야 할 항목들을 결정하였다. GMG (Global Mining Guidelines Group)에서 제안한 핵심성과지표(KPIs)들의 산정식을 분석하여 차량 운행시간을 기록하는 방법을 결정할 수 있었다. 국내의 석회석 지하 광산을 연구지역으로 선정한 후 표준 트럭 작업 일지를 이용하여 운반 작업의 성능을 평가하였다. 그 결과, 트럭의 가용률 측면에서 가동시간이 46.7%, 물리적 가용률과 기계적 가용률은 모두 100%로 나타났다. 이용률의 경우, 가용장비 이용률이 88.2%, 자산 이용률이 41.1%, 운영 이용률과 유효 이용률은 각각 88.2%와 79.2%로 나타났다. 효율성의 경우에는 운영 효율성이 89.9%로 나타났다.

• 한국구조물진단유지관리공학회 논문집
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• 제27권1호
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• pp.64-70
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• 2023

본 연구에서는 1.04배 드릴비트 직경 및 1.02배 드릴비트 직경 시 앵커의 신뢰성시험을 수행하였다. 각 변수별 시험을 통해 앵커의 표준편차 및 변동계수를 검토하였고, 기준시험 결과와 비교 평가하였다. 1.04배 드릴비트 직경을 가진 M12 및 M16 앵커의 신뢰성시험결과, 극한 인장하중 허용기준 변동계수 값인 20% 이내의 값을 나타내어 시험기준을 만족하였다. 또한, 1.04배 드릴비트 직경을 가진 앵커의 성능은 기준시험 대비 M12 앵커는 약 74%, M16 앵커는 약 55% 정도로 나타나 앵커의 내력이 다소 부족한 성능을 나타냈지만, 설계강도 대비 약 253% 및 210%로 나타나 1.04배 드릴비트 직경에 설치된 앵커의 인발성능은 충분히 확보하고 있음을 알 수 있었다. 1.02배 드릴비트 직경을 가진 M12 및 M16 앵커의 신뢰성시험결과, 극한인장하중 허용기준 변동계수 값인 20% 이내의 값을 나타내어 시험기준을 만족하였다. 또한, 1.02배 드릴비트 직경을 가진 앵커의 성능은 기준시험 대비 M12 앵커는 약 48%, M16 앵커는 약 53% 정도로 나타나 다소 부족한 성능을 나타냈지만, 설계강도 대비 약 136% 및 168% 로 나타나 1.02배 드릴비트 직경에 설치된 앵커의 인발성능은 충분히 확보하고 있음을 알 수 있었다.

• 한국태양에너지학회 논문집
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• 제30권3호
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• pp.116-123
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• 2010

A various building certification systems are being enforced in Korea. However, the enforcement of many building certification systems has brought on the concerned people's confusion and the operation of various building certification systems which have similar assesment items causes much time and economical losses. Therefore, in this paper, the features of the GBCS(Green Building Certification System), Housing Performance Indication System, Building Energy Rating System, and Green Home Standard and Performance Evaluation System are compared and the correlations among each building certification system are analysed. As a result, it is presented that a considerable number of assessment items were so similar and identical that integration of building certification systems is needed for effective operation of these systems.

• The Journal of Asian Finance, Economics and Business
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• 제7권12호
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• pp.1005-1015
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• 2020

This paper aims to propose a Comprehensive Decision Support Model to evaluate retail companies' financial performance traded on the Vietnam Stock Exchange Market. The financial performance has been examined in terms of the valuations ratios, profitability ratios, growth rates, liquidity ratios, efficiency ratios, and leverage ratios. The data of twelve companies from the first quarter to the fourth quarter of 2019 and the first quarter of 2020 were employed. The weights of 18 chosen financial ratios are calculated by using the Standard Deviation method (SD). Grey Relational Analysis technique was applied to obtain the final ranking of each company in each quarter. The results showed that leverage ratios have the most significant impact on the retail companies' financial performance and gives some long-term investment recommendations for stakeholders and indicated that the Taseco Air Services Joint Stock Company (AST), Mobile World Investment Corporation (MWG), and Cam Ranh International Airport Services Joint Stock Company (CIA) are three of the top efficient companies. The three of the worst companies are Viglacera Corporation (VGC), Saigon General Service Corporation (SVC), and HocMon Trade Joint Stock Company (HTC). Furthermore, this study suggests that the GRA model could be implemented effectively to ranking companies of other industries in the future research.

• ETRI Journal
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• 제29권3호
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• pp.292-299
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• 2007

In this paper, we present a speech recognition system using a throat microphone. The use of this kind of microphone minimizes the impact of environmental noise. Due to the absence of high frequencies and the partial loss of formant frequencies, previous systems using throat microphones have shown a lower recognition rate than systems which use standard microphones. To develop a high performance automatic speech recognition (ASR) system using only a throat microphone, we propose two methods. First, based on Korean phonological feature theory and a detailed throat signal analysis, we show that it is possible to develop an ASR system using only a throat microphone, and propose conditions of the feature extraction algorithm. Second, we optimize the zero-crossing with peak amplitude (ZCPA) algorithm to guarantee the high performance of the ASR system using only a throat microphone. For ZCPA optimization, we propose an intensification of the formant frequencies and a selection of cochlear filters. Experimental results show that this system yields a performance improvement of about 4% and a reduction in time complexity of 25% when compared to the performance of a standard ZCPA algorithm on throat microphone signals.

• International Journal of Contents
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• 제14권1호
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• pp.39-44
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• 2018

Today, cars have developed into intelligent automobiles that combine advanced control equipment and IT technology to provide driving assistance and convenience to users. These vehicles provide infotainment services to the driver, but this does not improve the safety of the driver. Accordingly, V2X communication, which forms a network between a vehicle and a vehicle, between a vehicle and an infrastructure, or between a vehicle and a human, is drawing attention. Therefore, various techniques for improving channel estimation performance without changing the IEEE 802.11p standard have been proposed, but they do not satisfy the packet error rate (PER) performance required by the C-ITS service. In this paper, we analyze existing channel estimation techniques and propose a new channel estimation scheme that achieves better performance than existing techniques. It does this by applying the updated matrix for the data pilot symbol to the construct data pilot (CDP) channel estimation scheme and by further performing the interpolation process in the frequency domain. Finally, through simulations based on the IEEE 802.11p standard, we confirmed the performance of the existing channel estimation schemes and the proposed channel estimation scheme by coded PER.