• Journal of the Korean Institute of Telematics and Electronics
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• v.20 no.6
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• pp.23-28
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• 1983

Two measures of similarity between contours, the 1 st-order similarity measure and the 2nd-order similarity measure are proposed. They are based on the residual errors of the least squares fit. In particular, the 2nd-order similarity measure has a good reliability with respect to contours of many variations such as imperfection, affine transform or combination of these properties. By taking experiments of aircraft identification and recognition we show that in the matching performance the 2nd -order similarity measure is superior not only to the 1 st-order similarity measure but also to the previous matching techniques.

• Korean journal of food and cookery science
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• v.27 no.5
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• pp.567-575
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• 2011

This study was investigated the antioxidative and antimicrobial activities of a water extract (70$^{\circ}C$) of traditional Korean teas (rose, chrysanthemum, pine needles, mulberry, persimmon leaves, and green tea). Total phenol contents in rose, chrysanthemum, pine needles, mulberry, persimmon leaves, and green tea were 272.8, 74.6, 153.5, 73.5, 69.5, and 260.8 mg tannic acid/g extract, respectively, whereas total flavonoid contents were 75.1, 47.8, 26.8, 40.0, 27.9, and 99.5 mg quercetin/g extract, respectively. The order of electron donating abilities of Korean traditional tea water extracts (1 mg/mL) were : rose (96.8%) > green tea (95.3%) > pine needles (71.3%) > chrysanthemum (36.8%) > mulberry (28.9%) ${\qeq}$ persimmon (28.8%). The order of nitrite-scavenging abilities at pH 1.2 (2 mg/mL) was green tea > rose > pine needles > chrysanthemum ${\qeq}$ mulberry ${\qeq}$ persimmon. The order of hydroxyl radical scavenging activity (5 mg/g) was chrysanthemum > mulberry > rose > persimmon leaves > pine needles > green tea. Rose extracts showed antimicrobial activity against Micrococcus luteus, Bacillus cereus, Salmonella enteritidis, and E. coli, whereas green tea extracts showed strong antimicrobial activity aginst S. enteritidis.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.06a
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• pp.283-284
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• 2013

일본의 제2차 해양기본계획이 올 4월에 발표되었다. 이 계획은 지난 1차 기본계획(2008-2012)에 이은 제2차 계획으로 2013년 이후 5년간 일본의 국가 해양 전략에 대한 비전과 향후 추진과제가 제시되어 있다. 2008년에 수립된 1차 계획이 일본의 통합해양에 대한 기반 구축이 목표였다면, 이번 2차 계획은 1차의 성과를 토대로 해양의 이용과 관리를 구체화하고 세분화한 것이 특징이다. 분산된 해양행정을 종합 조정하기 위해 2007년에 설립된 종합해양정책본부의 기능도 강화했다. 종합해양정책본의 사무국 기획기능을 강화하고 부처간 실무급 회의기구에 민간의 참여를 확대했다. 우리나라의 해양수산부나 올해 신설된 중국의 국가해양위원회와 같은 종합 해양행정 조직의 구축 단계까지로 이르지는 못했지만 바다를 통해 국가 현안을 극복하고 타 분야와의 협업을 통해 해양력을 강화하고자 하는 일본의 해양 정책 방향성은 시의 적절한 것으로 평가된다.

• Nuclear Engineering and Technology
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• v.3 no.3
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• pp.129-140
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• 1971

Two laboratory-melt heats of 3.25 silicon-iron were made and processed according to a normal commercial practice. Some of the important processing variables that were studied in relation to secondary recrystallization and texture development were contents of manganese and sulfur, heat-treatments after hot-rolling that were used to achieve different hot-rolled microstructures, and amounts of second cold-reduction. The main effort of the present study was directed toward elucidating the relationships among the amount of second cold-reduction, activation energies associated with secondary recrystallization and texture development. The specimens that had been cold-reduced 10% exhibited only grain growth by strain-induced grain boundary migration and did not exhibit secondary recrystallization. Secondary recrystallization did rot appear to completely occur in the 30% cold-reduced specimens, although the nucleation for secondary recrystallization was observed. The second cold-reduction in an amount of 50% was shown to be the optimun for secondary recrystallization and texture development by subsequent processing.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.38B no.10
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• pp.843-850
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• 2013

Cognitive radio systems have been considered as a strong solution of frequency scarcity due to the limit of frequency resources. This paper proposed an active interference management scheme that the secondary system can coexist with the primary system in the same frequency band without interference. Using the proposed protocol, the secondary user acquires interference channel information and transmit/receive filter information and designs precoding matrix using these information. Since interference from the secondary systems are collected to unused subchannels of the primary system, the primary system can suppress interference without additional process. The secondary systems suppress interference from the primary system using whitening matched filter so that the spectral efficiency can be improved. Numerical results provides that the proposed scheme improves performance of the secondary systems without interference to the primary system and do not degrade performance of the primary system even if the number of the secondary systems increases.

• Journal of Energy Engineering
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• v.9 no.4
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• pp.288-294
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• 2000

본 논문은 1차와 2차 연료 라인을 설치한 실제 연소로에 형성된 프로판 난류화염으로부터 방출되는 NO의 생성변화를 연구하였다. 1차 연료는 버너의 노즐로 일정하게 공급되고, 추가적으로 2차 연료는 맥동되거나 또는 일정한 양이 첨가되었다. 2차 연료를 공급 튜브의 위치를 주 연료 튜브의 중심 또는 보염기 주위에 설치하였다. 연소로의 출구에서 화학종 $O_2$,CO, $CO_2$, NO와 HC(미연 탄화수소)의 평균 농도를 측정하였다. 당량비가 증가함에 따라, 후자의 방식에서의 NO 농도의 분포는 전자의 방식에서 보다 더 천천히 증가하였다. 당량비가 0.5에서 0.54 범위에서는 전자의 방식보다 후자의 방식이 NO 생성을 dir 35%까지 감소시켰다. 2차 연료의 맥동에 대한 NO에서도 변화의 영향은 2가지 방식에서 모두 나타나지 않았다.

• Journal of Energy Engineering
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• v.24 no.2
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• pp.129-143
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• 2015

Increasing concerns on climate change and energy security accelerated policies to reduce green-house gas emission, especially from the transportation sector. Electric vehicle (EV) has been on the spotlight to deal with such environmental issue and V2G (Vehicle-to-Grid) technology began to draw attentions as an alternative to reduce ownership costs while contributing to an efficient and decentralized power grid. This study conducts a scenario analysis on total cost of ownership of EV under V2G scheme and compare with non-V2G EV and Internal Combustion Engine (ICE) vehicle. As result, V2G service is expected to provide an annual average profit of $210 to EV users willing to reverse flow its residual power in the battery. The profit from V2G service leaves a margin of $4,530 over operational lifetime, compared with $2,420 cost of charge for non-V2G EV. In summary, total cost of ownership of V2G-capable EV was 6.2% less than non-V2G EV and 10.2% higher than ICE vehicle. The results confirm a comparative economic advantage of operating EV under V2G scheme. Increased number of EVs with V2G service has shown to provide positive effects to power industry for valley filling in load distribution, thus, favorably increasing the overall economic feasibility.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.22 no.3
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• pp.354-361
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• 2011

In this paper, we propose a spectrum sharing system that enable secondary user's spectrum access in cooperative communication scheme. At phase 1, a transmitter in primary system broadcasts signals to the rest nodes. And then, at phase 2, a transmitter in secondary system combines the decoded signals after received from a transmitter in primary system and its own signal. And then transmitter of secondary system broadcasts the combined signals to receivers of primary and secondary systems. At this time, due to the process of combining signals, receivers of primary and secondary systems experiences a performance degradation. Therefore, we propose a novel adaptive incremental decode-andforward(AIDF) protocol to overcome this problem. By using AIDF protocol, we show performance improvement of total system through various simulations.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2002.11a
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• pp.123-126
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• 2002

레독스-흐름 2차 전지는 레독스 쌍이 녹아있는 수용액을 탱크에 저장한 다음 펌프로 유통형 전해 셀에 공급해 충방전하는 2차 전지의 한 종류이며, 종래의 2차 전지와는 다른 재생형 연료전지 중의 하나이다[1]. 이러한 전지의 원리는 19세기말부터 알려져 있었지만, 중량과 용적이 컸기 때문에 소형화, 경량화가 중시되는 2차 전지로서는 부적당하였고, 수용액을 사용하기 때문에 기전력이 낮다는 결점이 있었다.(중략)

• Journal of applied mathematics & informatics
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• v.2 no.2
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• pp.75-82
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• 1995

4대의 제어점에 의해 정의되는 3차 Bezier 곡선을 구간적 (piecewise) 2차 Bezier 곡선으로 근사 하는 기하적인 알고리듬을 제시한다. 또한 제시한알고리듬의 오차해석을 통하여 수정된 알 고리듬을 구성한다. 분확방법을 동시에 사용하여 주어진 허용오차 이내의 구간적 2차 근사 곡선을 구할수 있다. 제시한 알고리듬은 오차해석을 이용하여 필요한 분활의 수행회수를 미 리 결정할수있는장점을 가지고있다.