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장말손은 조선 세조 때의 무신이었다. 그가 1466년 함경도 회령에서 일어난 여진족 아지발 등의 침략을 물리치자, 세조는 그에게 보물 제188-2호로 지정된 <장말손 패도>를 하사하였다. 이 유물은 구조적인 면에서 젓가락을 넣을 첨자도(籤子刀)의 일종이다. 도금이나 상아 등 최고급 재료, 용이나 거북 등 상징적 형태, 금은 세공기술을 통해 왕실 공예품의 높은 수준을 엿볼 수 있다. 세종대부터 성종대까지 중국은 조공용이나 선물용으로 조선에 많은 칼을 요구하였다. 당시 조선의 도자장(刀子匠)이 크기가 작고 젓가락 등을 끼운 첨자도를 비롯한 ‘삼사도(三事刀)' 등 다용도 칼을 대량으로 제작하였다. 따라서 이 유물은 15세기 조선 왕실의 문헌기록을 실물로서 증명하는 것일뿐 아니라, 이 시대의 왕실 금속공예품을 대표한다는 점에서 역사적 학술적 가치가 매우 크다. Jang Mal-sohn was a military official during the era of King Sejo in the Joseon Dynasty. For Jang had defeated the invasion of Joseon by the Jianzhou Jurchen people in Hoeryong, Hamgyong Province in 1466, King Sejo bestowed him a cavalry sword along with other prizes. <The Ornamental Knife of Jang Mal-sohn> resembles a clasp knife(籤子刀) that was designated as national treasure number 188-2. This sword is made of luxurious materials such as gold and ivory, and it shows a strong symbolic representation with the figure of dragon and tortoise. It demonstrates the exceptional level of the imperial handcrafts through the techniques of covering with bamboo sheath and working with gold and silver. Meanwhile, the imperial China usually demanded a variety of small knives as tribe or gift for its envoys between the era of Sejong and Seongjong of Joseon. For this reason, the knife craftsmen of Joseon were to produce small clasp knives that can carry chopsticks. According to the Annals of the Joseon Dynasty, the craftsmen created a large number of multipurpose knives including the set of 3 knives or the set of 5 knives . Thus, this knife contains a historical significance as it represents the imperial metal craft of the Joseon Dynasty in the 15th century.
It was said that many of the treasonable plot concerned the eunuch took place frequently and changed the political climate in the lately Chosun Dynasty period. During the reign period between the king Kwanghaegun(光海君) to Injo(仁祖), these events got mixed with the trouble of the succession of king. The times of king Sukjong(肅宗)' s was the political struggle years between Southerners(南人) and Westerners(西人). It was the changeful period from Gyongjong(景宗) to Yeongjo(英祖) that the Noron party(老論) came to the power and the Soron party(小論) responded to the Noron party in the meanwhile. All the before and after of the enthronement of Jeonjo(正祖), since when the Noron party took the political leadership. It seemed to me that the eunuch took part in the political change course because they was likely to look around the king nearly. They did not control the affairs of state by themselves but were needed inevitably by the ambitious court officials for the access or the turnover of political power. Those officials could remove the kings of the generation in Chosun Dynasty by killing or poisoning through the eunuch and the court lady who serviced on the king at the most closed palace. As time go by, the function of the eunuch and the court lady was changed. The eunuch played the middle part of treasonable affairs with the court lady in the reign of king Kwanghaegun and Injo Especially each case of Min Hee-gun(閔希騫) or Bae Hee-do(裵希度) was not the prime mover's case. Each of eunuch concerned of their case was the assistant whom the prime mover entice to kill the king at Court. Either case of Park Sang-gum(朴尙儉) or Chang Sea Gil(張世相), however, was transformed into the prime mover s cases. As is remarked above, when the bureaucratic group and the maternal relative group of King continued to attempt to seize the political power, their groups formed friendly relations with the eunuch and the court lady properly for the a treasonable plot and by their needs. For this reason, the eunuch and the court lady had consider influence upon the political transformation in the latter period of Chosun Dynasty.
The strategy and potential utilization of temperate germplasm for the improvement of tropical germplasm: genetic diversification program is a GEM (germplasm enhancement of maize) of a resource for(Zea mays L.) growers in USA
Sun-Hee,Woo,Tea-Young,Oh,Hee-Young,Jang,Jung-Hee,Ko,Seong-Bum,Baek,Young-Up,Kwon,Matthew,Krakowsky,Major,Goodman,Peter,J.,Balint-Kurti,James,B.,Holland,Yoon-Sup,So 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07
In U.S.A. maize breeding, exotic germplasm is considered as high-risk and usually introduced by backcrossing specific traits into elite lines. The U.S.A. maize germplasm base is narrow. Only a few open-pollinated varieties are well represented in current programs. Currently, the barrier in using of exotic germplasm in the U.S.A is less formidable than in the 1980s. The major reason is that U.S.A materials are now used in tropical breeding to accelerate earlier maturity and lodging resistance. These exotic materials, developed with U.S.A germplasm, are being introduced back into the U.S.A.Since1994, the ARS-led Germplasm Enhancement of Maize (GEM) project has sought to help broaden the genetic base of America's corn crop by promising exotic germplasm and crossing it with domestic lines. New hybrids derived from such crosses have provided corn researchers and the producers. These may include improved or alternative native source of resistance to insect pests such as corn rootworms and diseases like northern leaf blight. GEM's aim is to provide source of useful genetic maize diversity to help the producers to reduce risks from new or evolving insect and disease threats or changes in the environment or respond to new marketing opportunities and demand. During the 2009 growing season, the Ames (Iowa) and Raleigh (North Carolina) locations managed or coordinated evaluations on 17,200 nursery plots as well as 14,000 yield trial plots in Ames and 12,000 in Raleigh. A new “allelicdiversity” study is devoted to exploring and capturing the genetic variation represented by over 300 exotic corn races. Since 2001, GEM has released 221 new corn lines to cooperators for further development into elite commercial new hybrids. GEM has already identified about 50%-tropical, 50%-temperate families tracing primarily to tropical hybrids that are competitive with commercial checks. In North Carolina State University program, they have examined the potential of tropical inbredand hybrids for U.S.A. breeding by crossing temperate-adapted, 100%-tropical lines to U.S.A hybrids. There should be favorably unique alleles or genomic regions in temperate germplasm that can be helpful in tropical maize improvement as well as utilization of tropical lines in temperate areas.
Pultruded glass fiber reinforced polymeric plastic (PFRP) and FRP member manufactured by sheet molding compound (SMC) have superior mechanical and physical properties compared with those of conventional structural materials. Since FRP has an excellent corrosion-resistance and high specific strength and stiffness, the FRP material may be highly appreciated for the development of floating-type photovoltaic (PV) power generation system. In this paper, advanced floating PV generation system made of PFRP and SMC is designed. In the design, it includes tracking solar altitude by tilting photovoltaic arrays and tracking solar azimuth by spinning structures. Moreover, the results of the finite element analysis (FEA) are presented to confirm stability of entire structure under the external loads. Additionally, installation procedure and mooring systems in the Hap-Cheon Dam are discussed and the measurement of strain under the actual circumstances is conducted for assuring stability of actually installed structures. Finally, by comparison with allowable stress, appropriate safety of structure is confirmed to operate the system.
Recently, As a part of urban forestation, the introductions of green roofs into public projects has been actively driven. Supported by this policy, the sizes of domestic green roof related markets have been rapidly expanding and many types of root barrier materials developed in Korea or abroad are being commercially distributed. In this study, root barrier tests were conducted over two years with nine types of sheet type waterproof materials that are the most commonly used as root barrier layers in green roof systems. The test conditions prepared considered the climates, natural features and vegetation in Korea and the results and related root barrier performance were verified. From the results of this study, the necessity to improve the joint part of root barrier sheets and forming methods has been identified and a measure to improve domestic root barrier testing methods was proposed.
Background: Recently published series have indicated that postoperative colonic stenosis can occur in 5% to 46% of patients. Endoscopic therapy with balloon dilation and temporary stents offers a minimally invasive method for surgical revision of benign anastomotic colonic stenoses. The balloon dilation of a stenotic segments of the gastrointestinal tract has been proven to be a convenient and less invasive treatment method for most patients, but repeated dilation may be required. Complications associated with endoscopic therapy, including perforation, bleeding, technical failure, and stent migration, have been reported. Further, a few cases of anastomotic colonic stenosis treated by electrocautery therapy have been reported. Methods: In the present case report, we describe two cases of post-operative symptomatic anastomotic stenosis that were successfully treated by electrocautery incision therapy using an IT-knife. Results: Radial incisions were made with the IT-knife If colon muscular layer is damaged during radial incision, the risk of perforation could be increased, so the depth of the incision, estimated by comparison with the known width of the open biopsy forceps, was not deeper than muscular layer. There was no immediate or delayed procedure- related complication such as bleeding or perforation. Conclusions: We consider that electrocautery incision therapy using an IT-knife could be a suitable alternative method. Benign short-segment stricture on a portion of the digestive tract also seems a suitable indication for electrocautery therapy.
Acne is one of most common skin disorder in childhood and adolescence. Early treatment of acne is veryimportant because of permanent scar. Acne is the first sign of puberty and pediatric acne under 12 years of age was uncommon in the past. However, due to early adrenarche and menarche today, incidence of pediatric acne is increasing. Current studies for acne treatment have been conducted for children over age 12, and studies about safety and efficacy of medications for pediatric acne are lacking. Most adolescent acne has been managed with tetracycline and its derivatives or isotretinoin, but pediatric application is difficult due to side effects. Recently, some topical agents have been approved for acne patients over 9 years old. However, monotherapy using topical agents has its limitation in treating moderate to severe acne. A 10-year-old girl presented with erythematous papules and pustules on forehead and both cheeks that occurred a year before. She was diagnosed with moderate acne (Korea Acne Grading System 3). Application with topical clindamycin 1% for several months was ineffective. She was treated with oral azithromycin 250mg, three times a week for three months and topical adapalene 0.1% and clindamycin 1% daily, resulting in vast improvements. Maintenance treatment was done with monthly chemical peels using 30% salicylic acid and topical agents. Heretofore, symptoms are well controlled without flare ups.