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Spent coffee as a rich source of antioxidative compounds
최보경,고은미 한국식품과학회 2017 Food Science and Biotechnology Vol.26 No.4
Antioxidant activities and major antioxidants were investigated in the methanolic extracts of roasted and spent coffee to evaluate the feasibility of spent coffee as a source of functional ingredients. Phenolic compounds, such as gallic acid, protocatechuic acid, and chlorogenic acid, and nitrogenous compounds, including trigonelline and caffeine, were identified. Caffeine was the most abundant compound, followed by chlorogenic acid.Despite the significant reduction of antioxidants, 2,2,-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity was retained in more than 95% of roasted coffee. The retentions of superoxide dismutase (SOD)-like activity and ferric reducing antioxidant power (FRAP) were 65–90 and 46–60%, respectively. Gallic acid had a positive correlation with SOD-like activity, whereas protocatechuic acid positively correlated with FRAP, suggesting that the major compounds contributing to each antioxidant activity are different. These results show that spent coffee can be used as an antioxidant source for functional foods and cosmetic products to improve antioxidant properties.
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≪墨子≫에서 보이는 명命에 대한 비판의식과 통제 가능성
최보경 고려대학교 중국학연구소 2024 中國學論叢 Vol.- No.84
The purpose of this study is to demonstrate Mozi criticizing Ming命 and controlling life in situations when war or disaster occurs. We often blame fate when we continually experience sudden events and situations when it is impossible to perform through our own will, or various situations that cannot be explained by causality. Unpredictable situations likely lead to resignation and arbitrary judgment. However, Mozi seek to eliminate the tendency of the obsession with Ming命 by providing the belief that external circumstances can be controlled. Rational judgments or actions help us escape from fatalism. Sanbiao三表, Jianxiangai兼相愛 and Jiaoxiangli交相利 are expected that rational judgment and moral standards will enable people to control their lives in situations such as war and disaster. I aim to organize my thesis in the following manner. First, I seek to confirm Mozi's criticism of fatalism. Moreover, I will discuss the need for Sanbiao三表 and deliberation. Finally, I will explore how Jianai兼愛 makes life bearable and controllable in disasters.
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권력과 정치적 권위의 문제에서 바라 본 墨子의 정치사상
최보경 고려대학교 중국학연구소 2022 中國學論叢 Vol.- No.76
The aim of this paper is to study political thought of Mozi on power and political authority. Political thought of Mozi is the establishment and operation of a political system based on Shangtonglun(尙同論). Shangtong(尙同)'s logic should respect and follow the opinions of superiors, which have the return to feudalism centered at Tianzi(天子) and a vertical characteristics of the upper and lower. Therefore the challenge arises from two aspects. First, it did not reflect the political landscape at that time. Second, it is in conflict with his ethical ideology[兼愛]. These problems can be solved when political thought of Mozi is interpreted in terms of power and political authority. This becomes the theoretical basis for solving the two difficulties implied in Shangtonglun(尙同論). First, since the logic of homology is also applied to Tianzi(天子), the power of Tianzi(天子) can secure political authority by Tian(天). The attribution of Tian(天) is a premise that can induce voluntary obedience of the people because it is unselfish. Second, Tianyi(天意) is Jianai(兼愛). Tianzi(天子) must observe the horizontal ethical principles of Jianai(兼愛), so the power of Tianzi(天子) guarantees morality. As a result, the power of Tianzi(天子) will secure autonomous obedience and morality through the symbol of Tian(天).
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Preparation and characterization of phase change materials (PCMs)/carbon-based composites
최보경,최웅기,곽이구,서민강 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
In this study, phase change materials (PCMs) were prepared by stirring of carbon-based materials, such as expanded graphite (EG) in erythritol, stearic acid, and paraffin. EGs were added to various PCMs at different mass fractions (0.1, 0.2, 0.5, and 1.0 wt%). The surface and structure properties of the composites were determined by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The thermal properties of the composites were studied by thermal conductivity (TC) and thermogravimetric analyzer (TGA). The latent heat and thermal cycling stability were evaluated by differential scanning calorimetry (DSC).
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최보경,국윤수,서민강 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
The effect of electroless nickel-phosphorous (Ni-P) and sputtering plating on thermal, exothermic, and electrical properties of PAN-based carbon fibers (CFs) was investigated. The surface and structural properties of the CFs were determined by scanning electron microscope (SEM), transmission electron microscope (TEM), and X-ray diffraction (XRD), respectively. Thermal conductivity and exothermic analysis were tested using a thermal conductivity and power supply system. The electric resistance was obtained by measuring the surface resistance with 4-point probe electric resistivity tester.
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Electrochemical properties of hydrous RuO2/oxidized multi-walledcarbon nanotube composite electrodes
최보경,양재연,고재경,서민강 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Electrochemical properties of ruthenium oxide (RuO2)/multi-walled carbon nanotube (MWCNT) composite electrodes for supercapacitors were investigated. The electrodes were prepared by impregnating MWCNTs with different concentrations of RuCl3ㆍxH2O solution followed by chemical reduction and annealing at 150°C under a nitrogen atmopshere. Cyclic voltammetry results of 10 wt% RuO2/MWCNTs composite electrodes demonstrated that the specific capacitance of the deposited RuO2 electrode was significantly greater than that of pristine MWCNT and 5 wt% RuO2/MWCNT electrodes, respectively, in the same medium.
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최보경 한국동양철학회 2012 동양철학 Vol.0 No.38
이 논문은 율곡(栗谷)이 왜 기질변화(氣質變化)에 초점을 두고 수양론(修養論)을 전개했는지 존재론적으로 분석한 글이다. 율곡은 ‘기발리승일도(氣發理乘一途)’, ‘리통기국(理通氣局)’으로 ‘리’‘기’를 해석한다. 이러한 율곡의 리기관은 ‘존재론적 승반론(乘伴論)’으로 해석할 수 있다. 존재론적 승반론은 의존성과 환원불가능성, 공변(共變) 세 하위 명제를 포함하고 있으며, 율곡의 리기관에서 이 세 명제를 확인할 수 있다. 율곡의 리기관에 입각한다면 , 오성(五性)이 발현되어 칠정(七情)이 되는 과정은 단선적이며 다른 발현의 과정을 상정할 수 없다. 단지 발현될 때 청명(淸明)한 기를 타느냐 오염되고 잡박한 ‘기’를 타느냐에 따라 도덕적인 감정이냐 비도덕적인 감정이냐로 구분된다. 청명한 기를 타면 비도덕적 행위는 발생하지 않는다. 따라서 율곡은 기질(氣質)변화에 초점을 맞춰서 수양론을 전개한다. 이 논문에서는 율곡사상에서 ‘격물치지(格物致知)’와 ‘성의(誠意)’ 공부가 이런 존재론적 기반 위에서 성립된 것이라는 데 초점을 맞춰 분석하고자 한다.
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