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        • KCI등재후보

          Quinoxaline 기반 전자 주게-전자 받게 구조의 단분자 합성 및 응용

          김준태,김세경,장동욱 한국화상학회 2018 한국화상학회지 Vol.24 No.2

          전자 주게-전자 받게 (D-A) 구조를 가지는 퀴녹살린 유도체들을 산 촉매하 탈수 반응과 Suzuki coupling 반응을 이용하여 합성하였다. 퀴녹살린을 중심으로 dimethylaminobenzene (DMAB)과 triphenylamine이 수평방향과 수직방향에 각각 위치한 QxN2TPA, 그리고 동일한 구조에 DMAB와 methoxy substituted triphenylamine이 조합된 QxN2TPAOME를 합성하였다. UV-visible 분광법 및 순환 전압 전류법을 이용하여, 합성된 유기 단분자들의 광학 및 전기화학적 특성 분석을 실시하였다. QxN2TPA, QxN2TPAOME의 최대 흡수 파장은 THF 용액에서 각각 308, 313 nm를 나타내었으며, HOMO 및 LUMO 에너지 준위는 각각 QxN2TPA(-5.12, -2.98 eV), QxN2TPAOME(-5.01, -2.98 eV)를 나타내었다. 또한, 합성된 퀴녹살린 유도체들을 다양한 용매에 대하여 우수한 용매 의존 발색 효과를 나타내었는데, 이는 분자 내 전하 전달 과정을 통하여 생성된 큰 극성을 지니는 여기상태의 분자 에너지가 용매의 극성이 증가할수록 안정화되는 전자 주게 및 전자 받게 구조를 갖는 공액 물질의 특성에 기인한다. Quinoxaline derivatives (QxN2TPA, QxN2TPAOME) were successfully synthesized via consecutive acid-catalyzed dehydration reaction and suzuki-coupling reaction. The strong electron-donating dimethylaminobenzene and triphenylamine derivatives were systematically introduced around electron-withdrawing quinoxaline core, and this unique D-A configuration can induce the significant changes on energy level of the resultant small molecules. The optical and electrochemical properties of QxN2TPA and QxN2TPAOME were investigated using UV-visible and cyclovolammetric measurements. QxN2TPA and QxN2TPAOME exhibit the maximum absorption peaks at 308, 313 nm, respectively, in THF solution. HOMO and LUMO energy levels of two small molecules were calculated, and the values are -5.12 and –2.98 eV for QxN2TPA, and –5.01 and –2.98 eV for QxN2TPAOME. Owing to the facile intramolecular charge transfer process in excited-state, these small molecules also exhibit outstanding solvatochromic properties in various solvents, which is one of unique characteristics of conjugated molecules with D-A configuration.

        • KCI등재

          ‘승계계획’의 측면에서 본 조선시대 세자에 대한 연구

          김준태 계명대학교 한국학연구원 2020 한국학논집 Vol.0 No.78

          This paper analyzes the role of investiture of Crown Prince during the Joseon period in terms of succession planning. In the Joseon Dynasty, the throne was inherited to the ‘jeokjangja (嫡長子: the eldest son of the legitimate wife)’ as a rule. Accordingly, the Crown Prince was determined without verifying the ability of the Prince or the process of internal competition. In order to realize successful succession of leadership, it is necessary to first find a candidate with the best qualities, and second, make the candidate the best heir through education and training. The first condition, however, could not be met in the Joseon Dynasty. Ironically, Confucianism, the ruling ideology of Joseon, considers ideal for the wisest and most capable person with good character to become the king. Therefore, during the Joseon Dynasty, a great deal of time and effort were spent on educating the Crown Prince so that he could obtain the qualification as the successor to the throne. That is why ‘Sigangwon,’ the institution specializing in educating the Crown Prince was established. However, when a Crown Prince fails to obtain the qualifications necessary for the position in the end even with these efforts, he was replaced by the King despite of political burden. Such was the case of Prince Yangnyeong dethroned by King Taejong and Prince Sado, who was killed by King Youngjo. In addition, the practical cases related to Crown Prince during the Joseon period are informing and meaningful in terms of succession planning in that they prevented the risk of leadership gap, created the environment for successors and provided practical training opportunities through daeri-cheongjeong (代理聽政: regency of the prince). This study aims to enhance understanding of the royal succession and governing leadership of the Joseon Dynasty through careful examination of the institution of Crown Prince. 본 연구는 ‘승계계획(Succession Planning)’이라는 측면에서 조선시대 세자 책봉과 그 역할을 분석하였다. 조선에서 왕위는 ‘적장자(嫡長子)’에게 계승하는 것이 원칙이었기 때문에 내부경쟁이나 능력에 대한 검증이 없이 세자가 정해졌다. 리더십의 성공적인 승계가 이루어지기 위해서는 첫째, 최적의 자질을 가진 후보자를 찾아야 하고 둘째, 교육과 훈련을 통해 그 후보자를 최상의 후계자로 만들어야 한다. 하지만 조선시대에는 첫 번째 조건을 충족시킬 수가 없었다. 그런데 조선의 지배이념이었던 성리학은 구성원 중에서 가장 현명하고 능력이 뛰어나며 인품이 훌륭한 사람이 왕이 되는 것을 이상으로 여긴다. 따라서 조선에서는 세자가 왕위계승자로서의 자격을 갖출 수 있도록 세자 교육에 많은 시간과 노력을 할애했다. 세자전문교육기관인 ‘시강원(侍講院)’을 설치한 것은 그 때문이었다. 하지만 이와 같은 노력에도 불구하고 세자가 필요로 하는 자질을 끝내 갖추지 못했을 때는, 정치적 부담을 무릅쓰고 세자를 교체한 경우도 있었다. 양녕대군을 폐위한 태종과 사도세자를 죽인 영조가 여기에 해당한다. 이밖에도 리더십 공백이 초래할 수 있는 위험을 방지하고, 후계자를 위한 환경을 조성하였으며, 대리청정(代理聽政)을 통한 실무 실습기회를 부여했다는 점에서, 조선시대 세자와 관련한 실행 사례들은 ‘승계계획’의 측면에서 많은 교훈을 준다. 본 논문은 이에 대한 연구를 통해 조선시대 왕위계승과 통치 리더십에 대한 이해를 높이고자 한다.

        • SCOPUSKCI등재

          침전법으로 제조한 Al2O3-ZrO2-Y2O3계 분말의 특성

          김준태,홍기곤,이홍림 한국세라믹학회 1988 한국세라믹학회지 Vol.25 No.2

          The properties of the powders of the system Al2O3-ZrO2-Y2O3 prepared by precipitation method were investigated. Al2(SO4)3$.$18H2O3, ZrOCl2$.$8H2O and YCl3$.$6H2O were used as starting materials. Amorphous aluminum hydrate prepared by precipitation method was completely transformed to alpha Al2O3 as a result of calcining at 1100$^{\circ}C$ for 1 hr and gamma, delta and theta phases appeared as transition phases. In ZrO2-Y2O3 system prepared by co-precipitation method, the crystallization temperature of ZrO2 was increase with Y2O3 contents. The coupled crystallization occured in coprecipitated Al2O3-ZrO2-Y2O3 system, therefore the formation temperature of alpha Al2O3 and ZrO2-Y2O3 system. In this ternary system, the powder morphology showed a particular shape which was composed of large Al2O3 grains having small spherical ZrO2 particles within large Al2O3 grain and relatively large ZrO2 particles along the grian boundaries.

        • KCI등재

          열풍건조 및 오븐구이 닭발로부터 추출한 삼계탕 육수 제조

          김준태,Dicky Tri Utama,정해성,장애라,박재인,Yeong-Jong Kim,이성기 한국가금학회 2019 韓國家禽學會誌 Vol.46 No.3

          This study was conducted to develop and compare Samgyetang broth from extract of pre-treated chicken feet. Chicken feet were subjected to non-heating (control), heating at 70℃ for 12 h in a hot air dryer, and heating at 180℃ for 1 h in an oven. The heat-treated chicken feet were extracted at 121℃ for 1 h and 2 h, respectively. The extract was placed in a pouch with whole chicken carcass (470±10 g). The sealed Samgyetang retort was made according to the industrial method. The pH of the extract from preheated chicken feet was lower than that extracted from fresh chicken feet. The Thiobarbituric Acid Reactive Substances (TBARS) value of the preheated chicken feet extract was significantly lower (P<0.05) than that of fresh chicken feet extract, but there were no significant differences among the broths. As the extraction time increased, the pH and TBARS value decreased in the extract (P<0.05) but increased in the broth (P<0.05). According to the sensory evaluation test, the extract from 1 h hot air heating and drying was significantly better in appearance, aroma, and overall preference than the other treatments (P<0.05). The GC-MS results showed that benzaldehyde and benzothiazole, which are widely known to give meat and nuts flavor, were detected in those treatments (P<0.05). The Samgyetang broths prepared from 1 h hot air heating and drying extract were significantly higher in the overall acceptability according to the sensory test (P<0.05). In summary, the quality of retort Samgyetang broth can be improved by adding chicken feet extract which is subjected to heating and drying for 1 h.

        • 우리나라 전통 숯의 물리.화학적 특성

          김준태,김선화,김해진,Kim, Joon-Tae,Kim, Sun-Hwa,Kim, Hae-Jin 대한환경위생공학회 2006 대한환경위생공학회지 Vol.21 No.4

          The water purification was very important in Korea which has not sufficient water resource and while adsorption method among the various methods to eliminate the water pollutants has been widely used by activated carbon. This study was conducted the basic experiment for hall distribution, pH, conductivity, electronic microscope, cation exchange and inorganic materials the adsorption capacity of Korean traditional charcoal which has similar characteristics to activated carbon of organic pollutants. As a result of observing Korean traditional charcoal with electronic microscope, it was found that it has porous structure, oak charcoal has circular structure, pine charcoal has square structure and bamboo charcoal has hexagonal structure, which has high void fraction per unit area because of its thin cell wall structure. As a result of experimenting hall distribution, hall distribution of bamboo high temperature charcoal is high as 0.269cc/g and has the greatest inorganic contents and cation exchange capacity(CEC) which are the important factor of chemical adsorption.

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