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      • SCOPUSKCI등재

        NH<sub>4F</sub> 융제가 바륨 스트론튬 실리케이트계 형광체의 특성에 미치는 영향

        강희상,구혜영,정대수,주서희,홍승권,강윤찬,정경열,박승빈,Kang Hee Sang,Koo Hye Young,Jung Dae Soo,Ju Seo Hee,Hong Seung Kwon,Kang Yun Chan,Jung Kyeong Youl,Park Seung Bin 한국재료학회 2005 한국재료학회지 Vol.15 No.6

        [ $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ ] phosphor particles with high photoluminescence intensity under long wavelength ultraviolet were prepared by spray pyrolysis. We investigated the effect of $NH_4F$ flux added into starting solution on the morphology and photoluminescence intensity of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor prepared by spray pyrolysis. $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from starting solution containing $NH_4F$ flux had the maximum photoluminescence intensity at the post-treatment temperature of $1200^{\circ}C$ and the maximum photoluminescence intensity of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from the starting solution containing $NH_4F$ flux was $137\%$ of that of the phosphor particles prepared from the starting solution without flux material. $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from starting solution containing $NH_4F$ flux had larger size and more aggregated morphology than those prepared from starting solution without flux material. The photoluminescence intensity of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ phosphor particles prepared from starting solution containing $NH_4F$ flux above $3wt.\%$ had high photoluminescence intensities. The addition amount of $NH_4F$ flux showing the maximum photoluminescence intensity was $12wt.\%$. The optimum amount of $NH_4F$ flux was $5wt.\%$ when we considered the morphological and photoluminescence characteristics of $Ba_{1.5}Sr_{0.5}SiO_4:Eu$ ohosphor particles prepared by spray pyrolysis.

      • SCOPUSKCI등재

        고분자 전구체 용액으로부터 분무열분해법에 의해 합성되어진 구형 형상의 Y<sub>2</sub>SiO<sub>5</sub>:Ce 형광체

        강희상,강윤찬,박희동,설용건,Kang, H.S.,Kang, Y.C.,Park, H.D.,Shul, Y.G. 한국재료학회 2003 한국재료학회지 Vol.13 No.3

        Ce-doped $Y_2$SiO$_{5}$ phosphor particles of spherical morphology, fine size, high crystallinity and high photoluminescence (PL) intensity were prepared by spray pyrolysis. When nitrate precursor solution is adopted, hollow particles were formed by uneven drying rate between surface and inside of droplet. Citric acid and ethylene glycol were introduced as polymeric precursor to control the morphology of particles. When polymeric solution is adopted, polymeric chain is formed by the esterification reaction between carboxyl and hydroxy groups of citric acid and ethylene glycol, and considered as controlling the drying characteristics of droplet. $Y_2$$SiO_{5}$ :Ce phosphor particles prepared from polymeric precursor solution were spherical, filled, fine size and not agglomerate before and after post heat treatment. The optimum doping concentration of cerium was 0.5 mol% of overall solution concentration. The optimum amount of TBOS of high PL intensity and pure crystallinity of X2-type $Y_2$$SiO _{5}$ was 105% of stoichiometric amount. The PL intensity of $Y_2$X$/_{5}$ :Ce phosphor particles prepared using the polymeric precursor solution was 164% of that of the nitrate precursor solution due to homogeneous composition and good morphology.y.

      • 분무열분해법에 의해 제조된 나노 크기 세리아 입자의 도핑 영향

        강희상,강윤찬,정경열,박승빈,송락현 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1

        유기 첨가물을 함유하는 고농도 세륨 질산염 용액을 분무용액으로 사용하여 초음파 분무열분해공정에 의해 나노 크기의 세리아 분말들을 대량으로 합성하였다. 분무용액에 첨가한 유기물은 분해시에 다량의 가스들을 방출하여 분무열분해 공정에 의해 합성되어지는 세리아 분말들이 매우 속이 빈 형태를 가지게 한다. 이러한 속이 빈 형태의 분말들을 고온의 소성을 거쳐 결정성을 증가시키고 나노 구조를 가지는 세리아 분말을 얻었다. 이러한 나노구조의 세리아 분말들을 간단한 밀링 공정을 거쳐 나노분말화 하였다. 이러한 분무열분해 공정 및 밀링 공정을 혼합하여 제조한 세리아 분말은 수십 나노 크기의 매우 균일한 크기 및 형태 특성을 가졌다. 합성되어진 나노 크기의 세리아 분말을 고체산화물 연료전지(SOFC)의 전해질 재료로서의 활용가능성을 보기 위해 이온전도도 특성을 측정하였다.

      • 韓國産 石竹(패랭이꽃)科 植物에 關한 本草學的 硏究

        姜熙相,鄭榮穆,宋昊埈,辛民敎 한국전통의학연구소 1998 한국전통의학지 Vol.8 No.2

        For the purpose of developing Korean Herbalogy with the plants of Caryophllaceae which grow wild and is planted in Korea, the these and writings on herbalogy, from literature of successive generation, have been thoroughly investigative and the results obtained were as follows: 1. There were totaled to 20 genera and 124 species in Korea and among them midical plants are 11 genera, 30 species, some 24% in total. 2. According to the oriental names which can be used for medical purpose, the medical plantss belonging to the Caryphllaceae family were classified as Herba 11, Radix 7, Foilum 2, Semen, Flos, Rhlzoma 1 each. 3. According to sum of 124 species in Caryophllaceae family, they were classified into Cerastium genera 18, Dianthus gemera 16, Pseudos tellaria genera, Lychnis genera, Stellaria genera 12 each, Melandry um genera 11, Silene genera 10, Minuaria genera 8, Gypsophila genera, Sagina genera 5 each, Arenaria genera, Cucubalus genera 3 each, Spergual genera, Vaccaria genera 2 each, Agorostema genera, Amnodenia genara, Moehringia genera, Myosoton genera, Honkenya genera 1 each. Thus it was noticed that Cerastium genera was main kind. 4. According to the number of species of the orgin plants about each chinese materia medicals, they were classified into HERBA DIANTHI 4, RADIX PSEUDOSTELLARIAE 3, SEMEN VACCARIAE 5, RADIX GYPSOPHILAE 4. 5. According to the properties and principal curative action, they were classfied into drugs for treating febrifugal and removing heat from blood, Diuretocs 6 each, Drugs for treating febrifugal and detoxicant 2, Drugs for invigorating blood, circuration and eliminating blood stasis 3, tonics 1, easing joint movement 1, stimulation of lactation 44. 6. According to nature and flavour of medical plants, they were classified into warmth, heat; each 3, cold, cool; 11 each, balance 3 and unidentifird 2. Thus it was noticed that cold and cool is the main in nature and flavour of medical plants. 7. Toxic drugs were none. From this results, It was revealed that the plants for medical purpose in Caryophllaceae was 24% of the whole, in which Herba was mostly abundunt. It is considered that may expriements and clinical approches must be continued to use Caryophllaceae plants widely.

      • SCOPUSKCI등재
      • KCI등재

        藿香과 廣藿香의 精油成分 比較硏究

        辛民敎,姜熙相 대한본초학회 1996 大韓本草學會誌 Vol.11 No.1

        KWAKHYANG(藿香) is one of the oriental medicine that has been habitually used for the treatment of such vomiting, diarrhea, an intestinal convulsion, dyspepsia and a cold. The origin of KWAKHYANG(藿香) is HERBA AGASTACHIS(藿香, 排香草), and substitute HERBA POGOSTEMONIS(廣藿香), but the origin and the chemical constuents of the volatile oils of the two are greatly different. Current imported Kwakhyang are discriminated because of its flavor. Hence, an author analyze individual ingredients of volatile oils about kwakhyang grown in korea and impoted kwakhyang from china and from Indonesia This paper was supported by Won Kwang University in 1996. The results are as follow; 1. The chemical constituents of the volatile oil from the kwakhyang grown in korea have been studied by GC-MS. Main constituents are estragole(23.45%), pulegone(20.41%), limonene(dl,9.74%), menthone (trans,9.20%), menthone(cis,3.19%) caryophyl-lene (2.07) and 1-octen-3-ol(1.31%), and some minor constituents are 3-octanone, myrcene (bata), p-mentha-6, 8-dien-2-ol, acetate, linalool, terpinolene(alpha), linalool, piperitone, piperite- none, cadinene(delta), spathulenol(HERBA POGOSTEMONIS) and patchouli alcohol. 2. Main constuents of the china sample(HERBA POGOSTEMONIS) contain patchouli alcohol(41.66%), guaiene(delta, 5.52%), seychellene(5.41%), patchoulene(bata,3.47%), patchoulene(alpha,2.65%), guaiene(bata, 1.50%) and caryophyllene(trans, 1.10%), and some minor constituents are pinene(alpha), pinene(2-bata), limonene and selinene(delta). 3. Main constituents of the indonesia sample(HERBA POGOSTEMONIS) contain patchouli alcohol(40.65%), seychellene(6.21%), guaiene(delta,4.81%), patchoulene(alpha,4.12%), guaiene(alpha,3.55%), patchoulene(alpha,3.13%), aciphyllene(1.64%) caryophyllene(trans,1.17%), and some minor constituents are benzene, 1,2-dimethyl-, 3-carene(delta) and selinene(bata).

      • 블록식 보강토 옹벽의 근입 깊이에 따른 안정성 및 경제성 평가

        안광국 ( Kwang Kuk Ahn ),강희상 ( Hee Sang Kang ) 충북대학교 건설기술연구소 2011 建設技術論文集 Vol.30 No.1

        Lots of modular block wall, which is beneficial for the construction of road, railway and apartment building, have been constructed in order to efficiently turn to practical use of the land. Inserting reinforce material, which has big amount of tensile force such as Geotextile, in the backfill of general retaining wall was used for the construction method of modular block wall. Even though there were lots of standards regarding the design and construction of modular block wall in both Korea and abroad, building modular block wall has been in utter confusion because the details of the standard for the modular block wall was not prescribed well. For those reasons that I have mentioned in this study, the basic data were obtained for the efficiency of construction material management and improvement through the research regarding the foundation of modular block wall in the inserting part of reinforce material. The cost of construction increased and decreased in accordance to the depths of reinforce material insertion

      • KCI등재

        액적 분급 장치를 적용한 분무열분해 공정으로부터 합성된 실리카 분말의 특성

        강윤찬,주서희,구혜영,강희상,박승빈,Kang, Yun-Chan,Ju, Seo-Hee,Koo, Hye-Young,Kang, Hee-Sang,Park, Seung-Bin 한국재료학회 2006 한국재료학회지 Vol.16 No.10

        Silica powders with spherical shape and narrow size distribution were prepared by large-scale ultrasonic spray pyrolysis applying the droplet classification apparatus. On the other hand, silica powders prepared by large-scale ultrasonic spray pyrolysis without droplet classification apparatus had broad size distribution. Droplet classification apparatus used in this paper applied the principles of cyclone and dispersion plate with small holes. The droplets formed from the ultrasonic spray generator applying the droplet classification apparatus had narrow size distribution. The droplets with fine and large sizes were eliminated by droplet classification apparatus. The optimum flow rate of the carrier gas and diameter of the hole of the dispersion plate were studied to reduce the size distribution of the silica powders prepared by large-scale ultrasonic spray pyrolysis. The size distribution of the silica powders prepared by large-scale ultrasonic spray pyrolysis at the optimum preparation conditions was 0.76.

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