콜타르피치 기반 활성탄소섬유의 제조 및 특성에 관한 연구. II. 물리적 활성화법에 의한 활성탄소섬유의 구리(II), 니켈(II) 흡착 특성

최보경,윤광의,서민강,박수진,Choi, Bo-Kyung,Yoon, Kwang-Eui,Seo, Min-Kang,Park, Soo-Jin 한국섬유공학회 2015 한국섬유공학회지 Vol.52 No.2

In this paper, the heavy metal ion adsorption behavior in coal tar pitch-based activated carbon fibers (ACFs) during physical activation is presented. $N_2$ adsorption isotherms at 77 K were examined using Brunauer-Emmett-Teller (BET), Horvath-Kawazoe (H-K), and Barret-Joyner-Halenda (BJH) methods to characterize specific surface area, pore volume, and pore size distribution. The removal of heavy metal ions from ACFs was confirmed by atomic absorption spectroscopy (AAS). Experimental results for the ACFs showed a type I isothermal adsorption curve, which confirmed that the created pores were mostly microporous. After a 40-min steam activation, the fibers showed a high specific surface area of $1,693m^2/g$. In addition, all heavy metal ions in the ACFs were adsorbed after about 20 min, and the adsorption reached equilibrium within 1 h. It was found that the adsorption capacity of the ACFs was improved by the presence of micropores but was also dependent on the specific surface area of the ACF.

1P-172 Effect of catalytic graphitization, structural and thermal effects of heat-treated PAN-based carbon fiber on heating elements

최보경,강승욱,박수진,서민강 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

The catalytic graphitization, crystallization, exothermic, and electro properties of polyacrylonitrile (PAN)-based carbon fibers with and without electroless Ni-P coatings of various heat treatment temperatures were studied. The surface and structural properties of the PAN-based carbon fibers were determined by scanning electron microscope (SEM), X-ray diffraction (XRD), and Raman spectroscopy, respectively. P content in the Ni-P coatings was measured by inductively coupled plasma-atomic emission spectrometry (ICP-AES). The thermal characterization of the PAN-based carbon fibers was studied by thermo-graphic camera and differential scanning calorimetry (DSC). The electrical conductivity was obtained by measuring the surface resistance with 4-pin probe method.

매실농축액의 에틸카바메이트 분석과 노출량 평가

최보경,고은미,Choi, Bogyoung,Koh, Eunmi 한국식품조리과학회 2015 한국식품조리과학회지 Vol.31 No.2

The analytical method for ethyl carbamate (EC) in maesil (Prunus mume) extract was developed with deuterium-labeled ethyl carbamate as an internal standard. Samples were neutralized with an addition of 1 N sodium hydroxide solution, followed by a solid phase extraction with a Chem Elut cartridge. A standard curve exhibited a good linearity with correlation coefficient of 0.9991. The limit of detection (LOD) and limit of quantification (LOQ) were 2.91 ng/g and 8.83 ng/g, respectively. The recovery rate of EC ranged from 91.40% to 120.90%. The precision never exceeded 12.57% (intra-day) and 11.03% (inter-day). Samples were comprised of 24 home-made and 7 commercially-available maesil extracts. Eight home-made samples contained EC at levels between 3.39 and 75.76 ng/g. Three commercially-available samples had EC at levels between 11.67 and 20.16 ng/g. Average daily intakes of EC from maesil extracts for consumers were 0.23 g/kg of body weight. Based on a benchmark dose confidence limit ($BMDL_{10}$) of 0.25 mg/kg of body weight/day, the margin of exposure (MOE) of EC in maesil extract for consumers was 94,150, which is not of concern. Considering that a daily intake of maesil extract has been increasing, further studies on the formation of EC in maesil extract is needed.

우리나라 비점오염저감시설 설계에서의 불확실성 정량화

최보경,이옥정,박윤경,임태효,김상단 한국방재학회 2016 한국방재학회논문집 Vol.16 No.5

In this study, the stormwater capture ratio and load capture ratio are actually estimated using TP monitoring data and SWMM modeling. From such ratios’ estimation, uncertainties involved in the existing stormwater and load capture ratios and the relative impact of these uncertainties on the performance evaluation of designed non-point sources pollution control facilities are quantified. The study area is a small drainage catchment in the Busan Noksan industrial zone in order to exclude the effect of unnecessary uncertainty caused by various land use patterns. An interlocking module between SWMM and Matlab is used to estimate efficiently model parameters. As a result, main uncertainty in designing non-point sources pollution control facilities is due from underestimation of the stormwater capture ratio. Hence, the present stormwater capture ratio should be improved. 본 연구에서는 총인 모니터링자료와 SWMM 모델링을 이용하여 강우유출수 처리비와 삭감대상부하비가 산정된다. 이를 통하여 강우유출수 처리비와 삭감대상부하비 산정에 포함된 불확실성과 이러한 불확실성이 설계된 비점오염저감시설의 성능평가에 미치는 상대적인 영향이 정량화된다. 대상지역은 부산광역시에 위치한 녹산공단의 소규모 배수분구를 선정하여 토지이용패턴에 따른 불확실성을 사전에 배제하고자 하였으며, SWMM을 이용한 모델링에서의 효율적인 매개변수 추정을 위하여 SWMM-Matlab 연동 모듈이 이용된다. 분석결과 우리나라 비점오염저감시설 설계 시의 주요 불확실성은 강우유출수 처리비의 과소산정으로부터 기인하고 있으며, 따라서 현재 사용되고 있는 강우유출수 처리비 공식의 개선이 필요함을 살펴볼 수 있다.

자동차 시트용 탄소섬유 발열체의 발열 성능에 pH가 미치는 영향

최보경,오제하,서민강 한국기계기술학회 2017 한국기계기술학회 학술대회논문집 Vol.2017 No.12

Effect of heat treatment on crystallization, exothermic, and electrochemical properties of pitch-based carbon fibers

최보경,국윤수,서민강 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

The crystallization, exothermic, and electrochemical properties of coaltar pitch-based carbon fibers (CFs) with various temperatures were studied. The CFs were prepared from stabilized pitch-based carbon fiber at 500°C, 700°C, 900°C, and 1100°C with 60 min. The surface and structural properties of the ACF were determined by scanning electron microscope (SEM) and X-ray diffraction (XRD), respectively. N₂ adsorption isotherms at 77K were investigated by BET and BJH methods to characterize specific surface areas and pore volumes. The electrical conductivity was obtained by measuring the surface resistance with four probe method.

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.

율곡 誠意 공부의 덕 윤리적 함의

최보경 한국동양철학회 2023 동양철학 Vol.- No.59

The purpose of this study is to demonstrate that Yulgok's sincere intention〔誠意〕 implies the characteristics of virtue ethics. This paper aims to establish the meaningful discussion that Yulgok's sincere intention goes beyond the limits of normative ethics, duty ethics, or the constraints of knowledge, and is significant in pursuing the goal of individual's daily moral practice and well-being. Virtue ethics place emphasis on the will for the prosperity of the community, well-being, the virtues, character, and the cultivation of the agent. The moral agent can intentionally and repeatedly engage in virtuous actions through habituation thereby transforming their character. Yulgok's sincere intention aims to derive natural moral conduct through everyday will for practice, with the goal of cultivating virtuous dispositions. In other words, humans possess intellectual abilities and the virtues of renyilizhi〔仁義禮智〕. By cultivating these virtues, they attain an ideal state of character where virtuous actions can naturally manifest regardless of time and place. When aspiring to virtuous actions, the moral agent must be capable of comparing and analyzing various cases to derive rational judgments and conducts. This can be confirmed through Yulgok's interpretation of yi〔意〕 separated by nianlusi〔念慮思〕. Furthermore, Yulgok emphasized the importance of sincere mind〔實心〕. This is a driving force for appropriate judgment and moral choices making the virtue of renyilizhi〔仁義禮智〕 and impartiality. Therefore Yulgok's sincere intention provides a meaningful discussion explaining the interdependence between intellectual virtues and moral virtues required in the process of habituation. 이 연구의 목적은 율곡의 誠意 공부에 대한 덕 윤리적 함의를 조명하여 도덕 실천적 유의미성을 인식하는 것이다. 율곡의 성의 공부가 규범윤리나 의무윤리의 한계, 또는 지식적 앎의 한계에서 벗어나 개인의 일상적인 도덕 실천이 ‘좋은 삶(well-being)’ 또는 ‘잘 삶’ 등의 목표를 지향하는 데 유의미한 논의임을 규명하고자 한다. 덕 윤리에서는 공동체의 번영과 좋은 삶에 대한 의지에서부터 시작하여 행위자의 덕과 성품, 함양 등에 관심을 갖는다. 도덕 주체는 유덕한 행위를 의도적이고 반복적으로 실행해 보는 것, 즉 습관화(habituation)를 통해 사람의 성품을 변화시킬 수 있다. 율곡의 誠意 공부는 일상적인 실천 의지를 통한 성품의 자연스러운 도덕적 행위 도출을 목표로 한다. 다시 말해, 인간은 지성적 능력과 함께 仁義禮智의 덕을 갖추었으므로 이를 함양하여 언제 어디서든 자연스럽게 선한 행위가 가능한 이상적 성품의 상태가 된다는 것이다. 유덕한 행위를 하고자 할 때, 도덕 주체는 다양한 사례들을 비교 분석하여 합리적 판단 및 행위를 도출해 낼 수 있다. 이러한 논의는 율곡이 意를 念慮思로 해석하고자 하는 의도에서도 확인할 수 있다. 또한, 율곡은 實心을 강조했다. 실심은 시의 적절한 판단과 도덕적 선택이 항상 선한 목적으로 지향해 갈 수 있는 원동력으로, 仁義禮智의 덕을 실현하여 공정성을 갖게 한다. 이러한 전제에서 도덕 주체가 혼자 있을 때 스스로 삼가 조금의 私意가 섞이지 않게 한다면, 결국 악취를 싫어하듯 악행을 싫어하고 好色을 좋아하듯 일관성 있게 항상 선한 행위를 추구하려는 자발적이고 자연스러운 이상적 상태〔誠意〕에 이르게 된다. 이러한 율곡의 誠意 공부는 최근 논의되는 지성적 덕과 도덕적 덕의 상호의존의 필요성을 설명하는 데 유의미한 논의를 제공할 것이다.

墨子思想에 나타난 합리적 이익 추구와 배려의 양립 가능성

최보경 고려대학교 중국학연구소 2019 中國學論叢 Vol.0 No.65

The aim of this paper is to be compatible altruistic behavior and self-interest on the Mozi. In general, the former and the latter have been distinguished as moral and immoral. However he combined altruistic behavior with self-interest. Mozi suggested to reconcile the self-interest and care(愛). First, he broke up the concept of confrontation: Li(利) and Yi(義). Specially, Mozi tried to exclude selfish-desire and selfishness. Second, he suggested reasonable self-interest. Third, reasonable self-interest and love are no longer distinct on Mozi. He emphasized Ruo(若) to realize Jianai(兼愛), just like “See other people’s states as one’s own state”. Since Jianai(兼愛) includes inclusive love, it is effective to exclude selfishness. In Mohism, Jianai(兼愛) had always been argued in balance with Jiaoxiangli (交相利). However, if Jianai(兼愛) and Jiaoxiangli(交相利) are recognised equal, each theoretical feature may be overlooked. In meaning between Jian(兼) and Jiao(交) should be clearly recognized and distinguished. The former was proposed to emphasize the meaning of love or care, the latter implied the rationality of self-interest. In this respect, Mozi’s Jianai(兼愛) and Jiaoxiangli(交相利) is the theoretical premise of compatibility: self-interest and love.

2P-713 Fabrication and characterization of PVA/TiO₂/GO nanofibers through electrospinning and hydrothermal

최보경,박수진,서민강 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.0