http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hong, Jihyun,Seo, Dong-Hwa,Kim, Sung-Wook,Gwon, Hyeokjo,Oh, Song-Taek,Kang, Kisuk Royal Society of Chemistry 2010 Journal of materials chemistry Vol.20 No.45
<P>Recently Li<SUB>1.2</SUB>Ni<SUB>0.2</SUB>Mn<SUB>0.6</SUB>O<SUB>2</SUB>, one of the most promising cathode candidates for next generation Li rechargeable batteries, has been consistently investigated especially because of its high lithium storage capacity, which exceeds beyond the theoretical capacity based on conventional chemical concepts. Yet the mechanism and the origin of the overcapacity have not been clearly understood. Previous reports on simultaneous oxygen evolution during the first delithiation may only explain the high capacity of the first charge process, and not of the subsequent cycles. In this work, we report a clarified interpretation of the structural evolution of Li<SUB>1.2</SUB>Ni<SUB>0.2</SUB>Mn<SUB>0.6</SUB>O<SUB>2</SUB> upon the electrochemical cycling, which is the key element in understanding its anomalously high capacity, through careful study of electrochemical profiles, <I>ex</I><I>situ</I> X-ray diffraction, HR-TEM, Raman spectroscopy, and first principles calculation. Moreover, we successfully resolved the intermediate states of structural evolution upon electrochemical cycles by intentionally synthesizing sample with large particle size. All observations made through various tools lead to the result that spinel-like cation arrangement and lithium environment are gradually created and locally embedded in layered framework during repeated electrochemical cycling. Moreover, through analyzing the intermediate states of the structural transformation, this gradual structural evolution could explain the mechanism of the continuous development of the electrochemical activity below 3.5 V and over 4.25 V.</P> <P>Graphic Abstract</P><P>The original layered Li<SUB>1.2</SUB>Ni<SUB>0.2</SUB>Mn<SUB>0.6</SUB>O<SUB>2</SUB> evolves to a structure where the spinel-like region is locally embedded in the layered framework during cycling. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0jm01971b'> </P>
간척지의 토지이용 현상과 문제점 파악 및 발전방향 - 충남, 전북, 전남 지역 지자체 및 한국농어촌공사 지사 대상 설문조사 -
손재권 ( Son Jae-gwon ),정찬희 ( Jeong Chan-hee ),이동호 ( Lee Dong-ho ),고승환 ( Go Seung-hwan ),송재도 ( Song Jae-do ),이기성 ( Lee Gi-sung ),박종화 ( Park Jong-hwa ) 한국농촌계획학회 2020 농촌계획 Vol.26 No.3
The purpose of this study was to determine the problems of reclamation sites and the prospects of farming in reclamation areas seen by local governments and the KRC branches in Chungnam, Jeonbuk, and Jeonnam provinces. A mail survey method was used. The survey items were set for 15 items regarding the reclamation site situation, problems, and prospects. Seventy-five copies of the questionnaire were distributed to the local government, and 90 copies were sent to the KRC 165 copies in total. In response to the questionnaire, 72 recipients of the local governments responded, showing a 96% response rate, and 74 (82.2%) of the KRC responded. The overall response rate was 88.5%. The opinions on the rental method of the reclaimed land were found to differ according to the geographic conditions of the reclaimed land, the construction conditions, and the time. Regarding the survey on crops preferred for cultivation, rice was highest in both local governments (61%) and KRC (46%). When cultivating field crops in reclaimed land, 56% of local governments and 57% of KRC considered salinity a s t he most problematic or resolvable problem. Regarding growing other field crops in reclaimed land, salt and drainage problems were recognized as the biggest obstacles in all reclaimed land. As for technologies that need to be applied first for the future agriculture of reclamation land, KRC responded with automatic water management (48%) and local governments responded with unmanned agricultural machinery (32%). In order to diversify the land use in the reclamation area, it is necessary to reduce salt damage and ensure systematic maintenance, employing, for example, automatic water management facilities and drainage improvement methods. The results of this study can set a land use direction for reclamation sites and provide useful information for use in various forms.
Roles of Conceptus Secretory Proteins in Establishment and Maintenance of Pregnancy in Ruminants
Bazer, Fuller W.,Song, Gwon-Hwa,Thatcher, William W. Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.1
Reproduction in ruminant species is a highly complex biological process requiring a dialogue between the developing conceptus (embryo-fetus and associated placental membranes) and maternal uterus which must be established during the peri-implantation period for pregnancy recognition signaling and regulation of gene expression by uterine epithelial and stromal cells. The uterus provide a microenvironment in which molecules secreted by uterine epithelia and transported into the uterine lumen represent histotroph, also known as the secretome, that are required for growth and development of the conceptus and receptivity of the uterus to implantation by the elongating conceptus. Pregnancy recognition signaling as related to sustaining the functional lifespan of the corpora lutea, is required to sustain the functional life-span of corpora lutea for production of progesterone which is essential for uterine functions supportive of implantation and placentation required for successful outcomes of pregnancy. It is within the peri-implantation period that most embryonic deaths occur in ruminants due to deficiencies attributed to uterine functions or failure of the conceptus to develop appropriately, signal pregnancy recognition and/or undergo implantation and placentation. The endocrine status of the pregnant ruminant and her nutritional status are critical for successful establishment and maintenance of pregnancy. The challenge is to understand the complexity of key mechanisms that are characteristic of successful reproduction in humans and animals and to use that knowledge to enhance fertility and reproductive health of ruminant species in livestock enterprises.
Breeding and Genetics : Large-Scale Copy-Number Alterations in Chicken Ovarian Cancer
( Jin Won Choi ),( Yong Sang Song ),( Jae Yong Han ),( Hee Seung Kim ),( Hee Won Seo ),( Gwon Hwa Song ),( Tae Won Yun ),( Hong Jo Lee ) 한국동물자원과학회 ( 구 한국축산학회 ) 2010 한국축산학회지 Vol.52 No.6
Copy-number variation (CNV) in particular genomic segments owing to deletions or duplications can induce changes in cellular gene expression patterns and may increase susceptibility to diseases such as cancer. The aim of this study was to examine CNVs related to the incidence of epithelial ovarian cancer in chickens. Genomic DNA was extracted from blood cells and cancerous ovaries collected from four 120-week-old White Leghorn chickens and were used for array-based comparative genome hybridization (CGH) analysis. As a result, 25 amplified and 10 deleted CNV regions were detected in chicken ovarian cancer. Of these, 10 amplified and two deleted CNV regions contained genes associated with human ovarian cancer. Our study using a chicken model may provide a better understanding of human epithelial ovarian cancer.
박형 결정질 실리콘 태양전지에서의 휨현상 감소를 위한 알루미늄층 두께 조절
백태현(Tae-Hyeon Baek),홍지화(Ji-Hwa Hong),임기조(Kee-Joe Lim),강기환(Gi Hwan Kang),유권종(Gwon-Jong Yu),송희은(Hee-eun Song) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.3
Crystalline silicon solar cell remains the major player in the photovoltaic marketplace with 90 % of the market, despite the development of a variety of thin nlm technologies. Silicon's excellent efficiency, stability, material abundance and low toxicity have helped to maintain its position of dominance. However, the cost of silicon photovoltaic remains a major barrier to reducing the cost of silicon photovoltaics. Using the crystalline silicon wafer with thinner thickness is the promising way for cost and material reduction in the solar cell production. However, the thinner thickness of silicon wafer is, the worse bow phenomenon is induced. The bow phenomenon is observed when two or more layers of materials of different temperature expansion coefficiencies are in contact, in this case silicon and aluminum. In this paper, the solar cells were fabricated with different thicknesses of Al layer in order to reduce the bow phenomenon. With lower paste applications, we observed that the bow could be reduced by up to 40% of the largest value with 130 micron thickness of the wafer even though the cnversion efficiency decrease of 0.5 % occurred. Since the bowed wafers lead to unacceptable yield losses during the module construction, the reduction of bow is indispensable on thin crystalline silicon solar cell. In this work;, we have studied on the counterbalance between the bow and cnversion efficiency and also suggest the formation of enough back surface field (BSF) with thinner Al paste application.