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과산화 티타늄 복합체를 이용한 염료감응형 태양전지용 페이스트의 제조 및 열처리 온도에 따른 특성
박현수,주소영,최준필,김우병,Park, Hyunsu,Joo, Soyeong,Choi, Joon-Phil,Kim, Woo-Byoung 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.6
The organic binder-free paste for dye-sensitized solar cell (DSSC) has been investigated using peroxo titanium complex. The crystal structure of $TiO_2$ nanoparticles, morphology of $TiO_2$ film and electrical properties are analyzed by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Electrochemical Impedance Spectra (EIS), and solar simulator. The synthesized $TiO_2$ nanopowders by the peroxo titanium complex at 150, 300, $400^{\circ}C$, and $450^{\circ}C$ have anatase phase and average crystal sizes are calculated to be 4.2, 13.7, 16.9, and 20.9 nm, respectively. The DSSC prepared by the peroxo titanium complex binder have higher $V_{oc}$ and lower $J_{sc}$ values than that of the organic binder. It can be attributed to improvement of sintering properties of $TCO/TiO_2$ and $TiO_2/TiO_2$ interface and to formation of agglomerate by the nanoparticles. As a result, we have investigated the organic binder-free paste and 3.178% conversion efficiency of the DSSC at $450^{\circ}C$.
협업개발 환경에서의 효율적 동시성 제어를 위한 P2P기반 충돌해결 기법
박현수,김대엽,윤청,Park, Hyun-Soo,Kim, Dae-Yeob,Youn, Cheong 한국정보처리학회 2009 정보처리학회논문지D Vol.16 No.4
본 논문은 구성원들 사이의 자원공유를 원천적으로 봉쇄하는 일반적 협업개발 지원도구의 한계를 극복하고, 조직의 여러 사용자들에게 자원 공유의 기회를 제공함과 동시에 자원공유에서 발생하는 버전관리와 충돌문제를 해결하기 위한 방법을 제시한다. 개발된 소프트웨어 협업개발 지원도구는 전통적인 낙관적 기법을 적용하되 충돌해결에 드는 비용과 노력의 절감을 위한 개선된 알고리즘을 사용한다. 시스템의 구조는 전통적인 Client/Server 방식에 개인간 정보교환을 지원하는 P2P(peer-to-peer) 방식이 결합된 형태로 이루어져 있으며, 공개 소프트웨어인 CVS(Concurrent Version System)를 기반으로 구현되었다. 이를 바탕으로 대표적인 기존 협업개발 지원도구들과의 유용성 비교를 통해 기능적 효율성을 확인하였다. This paper provides a way to overcome limitations of general collaborative software development tools that completely restrict co-ownership of resources among individuals in a team oriented developmental environment. It also provides a solution for users to co-own resources and at the same time manage version control and collision problems that may occur due to the co-ownership of resources.The cooperative development support tool of developed software uses the conventional optimistic technique but employs the algorithm which is improved to reduce costs and efforts required for solving collision. The collaborative software development tool presented in this paper is made up of the classical client/server structure with the P2P(peer to peer) method which supports information exchange among individuals. This tool is developed based on open source software CVS(Concurrent Version System). Functional efficiency was confirmed by comparing it to the utility of prior existing collaborative software development tools.
박현수,현명택,이주희,김대영,이건,김현정,Park, Hyun Su,Hyun, Myung-Taek,Lee, Ju-Hee,Kim, Dae Young,Lee, Khan,Kim, Hyun Jung 한국식품조리과학회 2017 한국식품조리과학회지 Vol.33 No.3
Purpose: Gulbi is a salted and dried yellow corvenia that is popular in Korea. In this study, yellow corvenia was vacuum-dried under two different conditions, average temperatures of $48^{\circ}C$ for 12 and 15 h and $54^{\circ}C$ for 9 and 12 h. Quality characteristics of vacuum-dried Gulbi against fresh corvenia were investigated. Methods: Moisture content, water activity, salt concentration, pH, acidity, volatile basic nitrogen (VBN), thiobarbituric acid-reactive substances (TBARS), and fatty acid composition of Gulbi were evaluated. Results: Moisture contents of fresh corvenia and four types of vacuum-dried Gulbi were 67.37, 31.51, 13.62, 35.17, and 10.05%, respectively. The pH values were in the range of pH 6.70-6.98. The VBN values of Gulbi vacuum-dried at the higher temperature range were greater than those of Gulbi at the lower temperature range. The TBARS of Gulbi increased after vacuum drying (p<0.05). Palmitic acid, palmitoleic acid, oleic acid, and docosahexaenoic acid were the main fatty acids of Gulbi. Conclusion: These results indicate that the quality of vacuum-dried Gulbi is dependent on the drying conditions including temperature and time.
장시간 안정성을 위한 CdSe/ZnS 양자점의 표면처리 기술
박현수,정다운,김범성,주소영,이찬기,김우병,Park, Hyun-Su,Jeong, Da-Woon,Kim, Bum-Sung,Joo, So-Yeong,Lee, Chan-Gi,Kim, Woo-Byoung 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.1
We have investigated the washing method of as-synthesized CdSe/ZnS core/shell structure quantum dots (QDs) and the effective surface passivation method of the washed QDs using PMMA. The quantum yield (QY%) of as-synthesized QDs decreases with time, from 79.3% to 21.1%, owing to surface reaction with residual organics. The decreased QY% is restored to the QY% of as-synthesized QDs by washing. However, the QY% of washed QDs also decreases with time, owing to the absence of surface passivation layer. On the other hand, the PMMA-treated QDs maintained a relatively higher QY% after washing than that of the washed QDs that were kept in toluene solution for 30 days. Formation of the PMMA coating layer on CdSe/ZnS QD surface is confirmed by HR-TEM and FT-IR. It is found that the PMMA surface coating, when combined with washing, is useful to be applied in the storage of QDs, owing to its long-term stability.
진화전략과 실질적인 소자 값 제한을 통한 물리적 구현이 가능한 아날로그 회로의 자동설계
박현수(Hyun-Soo Park),김경중(Kyung-Joong Kim) 한국정보과학회 2011 정보과학회논문지 : 소프트웨어 및 응용 Vol.38 No.5
아날로그 회로는 모든 디지털 시스템의 기본으로 현재도 높은 중요도를 가지고 있지만 설계에 많은 전문지식을 요구한다. 이러한 문제를 해결하기 위해 진화 연산을 이용한 설계 자동화 기법이 연구되어 왔으나, 많은 경우 재현이 어렵고 계산비용이 많이 요구되어왔다. 최근 들어, 진화 전략을 이용하여 적은 집단 크기로 아날로그 회로를 진화시킬 수 있는 방법이 제안되었다. 본 연구에서는 진화 전략을 이용하여 아날로그 회로를 설계하는 방법을 기초로 실제 구현이 가능한 회로를 제작하는 방법을 제안한다. 많은 경우 실제 소자를 이용하여 물리적으로 구현하는 것을 고려하지 않기 때문에, 진화 회로는 시뮬레이션에만 그치고 만다. 본 연구에서는 진화과정에서 회로가 가질 수 있는 소자 값을 산업체에서 선호하는 E-12시리즈로 제한한 진화전략을 통하여 적은 복잡도로 물리적으로 구현 가능한 회로를 만들 수 있음을 보인다. 물리적 구현을 위한 다른 기법들과 비교를 통해 제안하는 방법의 우수성을 보인다. Analog circuits are fundamental parts of modern digital electronic systems but they require much expert knowledge to design them. To solve this problem, there are a lot of works on the automated synthesis of analog circuits using evolutionary computation. However, it is difficult to reproduce their results because of their complexity and requires high computational cost. Recently, Kim et al. proposed a method to evolve analog circuits using evolutionary strategy maintaining a very small size population. In general, analog circuits are evolved using simulation software and they put less effort on hardware implementation. In this work, we propose a method to evolve physically implementable analog circuits using the evolutionary strategy-based algorithm and practical constraints on component values. This allows the evolution of realistic analog circuits with less computational cost and complexity. Experimental results show that the proposed method outperforms other alternatives.
평야지 적응성 향상을 위한 벼흰잎마름병 및 줄무늬잎마름병 저항성 유전자 집적 조생 계통 개발
박현수(Hyun-Su Park),남정권(Jeong-Kwon Nam),김기영(Ki-Young Kim),김우재(Woo-Jae Kim),정지웅(Ji-Ung Jeong),백만기(Man-Kee Baek),김정주(Jeong-Ju Kim),조영찬(Young-Chan Cho),이점호(Jeom-Ho Lee),김보경(Bo-Kyeong Kim),안상낙(Sang-Nag Ahn) 한국육종학회 2015 한국육종학회지 Vol.47 No.2
This study was conducted to develop the early maturing rice lines with genes conferring resistance to bacterial blight and rice stripe virus to enhance the adaptability in plain area. Unkwang carrying Xa3 was used as a recurrent parent and SR30075 carrying Xa4+xa5+Xa21+Stvb-i was used as a donor parent. RL1(Resistant Line, BC1F7), RL2, RL3, RL4, and RL5(BC2F6) were bred through bio-assay of K3a race inoculation and phenotypic selection of agronomic traits. The presence of introduced genes was confirmed by testing the resistance levels against bacterial blight and rice stripe virus and then double-checked by using DNA marker. RL1 has all target genes, Xa3+xa5+Xa21+Stvb-i. RL2, RL3, and RL5 have Xa3+Xa21+Stvb-i whereas RL4 has only Xa21. Rice lines carrying Stvb-i showed resistance reaction to rice stripe virus. The combinations of bacterial blight resistant genes(Xa3+xa5+Xa21 and Xa3+Xa21) were found to be promising, as the rice lines carrying these genes enhanced a strong resistant reaction against 16 bacterial blight isolates. Also, the inoculation of K3a race did not alter the brown rice yield, ripened grain ratio and kernel quality of brown rice compared to control. Although RL1 containing all the target resistance genes showed excellent resistance performance, it is not suitable to cultivate in plain area due to instability to lodging, 80% yield level than Unkwang, and low grain quality. RL5 backcrossed twice with Unkwang was found to be a promising line due to its effective resistance gene combination, Xa3+Xa21+Stvb-i and good agronomic traits such as stability to lodging, higher yield and quality compared to Unkwang.
생육기간이 짧고 수당립수가 많은 자포니카 조생 사료용 벼 ‘조농’
박현수(Hyun-Su Park),백만기(Man-Kee Baek),김우재(Woo-Jae Kim),김정주(Jeong-Ju Kim),정종민(Jong-Min Jeong),조영찬(Young-Chan Cho),고종철(Jong-Cheol Ko),정지웅(Ji-Ung Jeung),정오영(O-Young Jeong),이창민(Chang-Min Lee),김석만(Suk-Man Ki 한국육종학회 2021 한국육종학회지 Vol.53 No.3
‘Jonong’ is an early maturing whole crop silage (WCS) japonica rice cultivar characterized by a short growth duration and numerousspikelets. It was developed to enhance the adaptability of WCS rice to double-cropping systems. ‘Jonong’ is derived from a cross between‘Binhae Col.#1’ and ‘Deuraechan’; ‘Binhae Col.#1’ is a semi-early maturing China rice germplasm with numerous spikelets on dense panicles,whereas ‘Deuraechan’ is a high-yielding japonica rice cultivar with numerous spikelets on long panicles. To diversify the genetic variationand shorten the breeding period, an anther culture method was applied to the F₁ plants. ‘Jonong’ was selected through the pedigree method,yield trials, and local adaptability tests, with a high selection pressure for short growth duration and high biomass. The average heading dateof ‘Jonong’ was August 1st, which is 11 days earlier than that of ‘Nokyang’, the standard cultivar for WCS rice. Moreover, the growth durationof ‘Jonong’ is the shortest among all Korean WCS rice cultivars. The culm length of ‘Jonong’ is 88 cm, which 4 cm longer than that of‘Nokyang’ and the highest among all Korean early maturing rice cultivars. ‘Jonong’ has 149 spikelets per panicle, which is 30 more thanthat of ‘Nokyang’, and is the highest among all Korean early maturing rice cultivars. ‘Jonong’ exhibits stable premature heading and is tolerantto lodging. It is moderately resistant to leaf blast and resistant to the rice stripe virus. The feed value of ‘Jonong’ in terms of total digestiblenutrients is good and comparable to that of ‘Nokyang’. Furthermore, compared with ‘Nokyang’, ‘Jonong’ shows a similar level of dry matteryield and a higher rough rice yield. Therefore, ‘Jonong’, an early maturing WCS japonica rice with short growth duration and numerousspikelets, would be suitable for cultivating in winter forage crop-rice double cropping systems (Registration No. 7274).