콜타르 피치 기반 활성탄소섬유의 제조 및 특성에 관한 연구(I) -수증기 활성화온도가 활성탄소섬유 형태학적 특성에 미치는 영향-

최보경,곽이구,윤광의,서민강,박수진,Choi, Bo-Kyung,Kwac, Lee-Ku,Yoon, Kwang-Eui,Seo, Min-Kang,Park, Soo-Jin 한국섬유공학회 2014 한국섬유공학회지 Vol.51 No.4

In this paper, the effect of the temperature of steam activation on textural properties of coal tar pitch-based activated carbon fibers (ACFs) was studied. Surface properties of the ACFs were determined by using scanning electron microscope (SEM) and X-ray diffraction (XRD). $N_2$ adsorption isotherms at 77 K were investigated by BET and BJH methods to characterize specific surface areas, pore volumes, and pore size distributions. The adsorption isotherms of the ACFs were constructed and analyzed to be of Type I, mainly consisting of micropores. The specific surface areas of the ACFs were increased with activation time and showed a maximum value of $2442m^2/g$ at an activation temperature and time of $900^{\circ}C$ and 40 min, respectively.

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.

Flurbiprofen 용매침착물(溶媒沈着物)의 용출특성(溶出特性)에 관(關)한 연구(硏究)

최보경,용재익,Choi, Bo-Kyung,Yong, Jae-Ick 한국약제학회 1985 Journal of Pharmaceutical Investigation Vol.15 No.3

Dissolution characteristics of flurbiprofen solvent deposited on ${\alpha}-cyclodextrin$, ${\beta}-cyclodextrin$, lactose and corn starch were studied to evaluate the pharmaceutical aspects of solvent deposition method where drug was solvent deposited on the surface of excipients. In a solvent deposition system, the drug to excipient ratio and kind of excipient affect much on dissolution rates of flurbiprofen. The solvent deposition system formation was confirmed by scanning electron microscope. By increasing the amounts of matrix, it was possible to enhance the dissolution rate of flurbiprofen solvent deposition system. The amount of flurbiprofen dissolved from ${\beta}-cyclodextrin$ deposition system (1:10) at 60 minutes was enhanced 6.5 times in water and 28 times in simulated gastric juice compared with flurbiprofen alone. Flurbiprofen solvent deposited system (1:10) enhanced dissolution rate greater than inclusion complex and dispersion system.

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.

강인한 음성인식을 위한 극점 필터링 및 스케일 정규화를 이용한 켑스트럼 특징 정규화 방식

최보경,반성민,김형순,Choi, Bo Kyeong,Ban, Sung Min,Kim, Hyung Soon 한국음향학회 2015 韓國音響學會誌 Vol.34 No.4

본 논문에서는 Cepstral Mean Normalization(CMN)과 Cepstral Mean and Variance Normalization(CMVN) 프레임워크에서 극점 필터링(pole filtering) 개념을 Mel-Frequency Cepstral Coefficient(MFCC) 특징 벡터에 적용한다. 또한 분산 정규화를 대신하여 스케일 정규화를 사용하는 Cepstral Mean and Scale Normalization(CMSN)의 성능을 잡음 환경 음성인식 실험을 통해 평가한다. CMN과 CMVN은 보통 발화 단위로 수행되기 때문에 짧은 발화의 경우 특징에 대한 평균과 분산의 추정 신뢰도가 보장되지 않는 문제점을 가지는데, 극점 필터링과 스케일 정규화 방식을 적용함으로 이러한 문제점을 보완할 수 있다. Aurora 2 데이터베이스를 이용한 실험 결과, 극점 필터링과 스케일 정규화를 결합한 특징 정규화 방식의 성능이 가장 높은 성능 향상을 보인다. In this paper, the pole filtering concept is applied to the Mel-frequency cepstral coefficient (MFCC) feature vectors in the conventional cepstral mean normalization (CMN) and cepstral mean and variance normalization (CMVN) frameworks. Additionally, performance of the cepstral mean and scale normalization (CMSN), which uses scale normalization instead of variance normalization, is evaluated in speech recognition experiments in noisy environments. Because CMN and CMVN are usually performed on a per-utterance basis, in case of short utterance, they have a problem that reliable estimation of the mean and variance is not guaranteed. However, by applying the pole filtering and scale normalization techniques to the feature normalization process, this problem can be relieved. Experimental results using Aurora 2 database (DB) show that feature normalization method combining the pole-filtering and scale normalization yields the best improvements.

朱子의 『大學』 ‘能慮’ 해석에 나타난 실천적 유용성

최보경(Choi, Bo-Kyung)(崔普京) 한국동양철학회 2020 동양철학 Vol.0 No.53

이 논문의 목적은 주자가 『大學』 ‘能慮’에 대한 해석 과정에서 도덕적 행위의 실천적유용성을 높이고자 했다는 것을 밝히는 데 있다. 주자는 ‘知止’에서 ‘能得’으로 이행되는 과정에서 慮라는 의식이 전제되어야 한다는 입장이다. 도덕 지식이 행위로 온전하게 이행되기 위해 구체적 사례에 적용 가능한지 살필 수 있는 의식이 요구된다는것이다. 왜냐하면, 가변적인 일상 또는 불확실한 미래에 발생할 수 있는 다양한 형태의 사건들에 대해 일정한 도덕 법칙만을 기준으로 예측 및 통제하기 불가능하기 때문이다. 즉, 도덕 지식에 대한 학습 및 인지만으로 도덕적 행위 가능성을 담보하기란 어려워 보인다. 주자는 다양한 사건 및 현실을 반영한 도덕 실현 방법을 강조했다. 慮란, 어떻게 하면 孝를 이행할 수 있는지·자애로움이란 어떻게 실천할 수 있는지 등과 같이 실현 가능한 방법을 탐색하는 사고 과정으로, 정신적 시뮬레이션(Mental simulation)이기도 하다. 이러한 사고 과정에서 도덕 주체에게는 私欲 배제 및 공공성 확보의 노력이 요구된다. 즉, 려는 도덕 지식의 현실적 적용 방법 모색 및 자기중심적 사고 배제 등이 함축된 사고 과정이다. 따라서 려를 둘러싼 주자의 제안은 경전을 통한 지식적 앎을 넘어 구체적 행위로 이행될 것을 최종 목적으로 하며, 그것은 현실적·맥락적 방법 고찰이자 실천적 앎의 확장인 셈이다. The purpose of this paper is to examine Zhu zi[朱子] who proposed ‘NengLu[能慮]’ to ensure the Practical Utility of Moral knowledge. On the process of taking Moral knowledge to practice, he proposed that Lu[慮] should be premised. A Moral knowledge implies a standard of distinguishing between good and bad behaviour. However, learning Moral knowledge cannot guarantee Moral conducts. For that reason, Zhu zi[朱子] proposed Lu[慮]. Lu[慮] is a process of thinking that investigates the way of Moral behaviour. For example, thinking about how to do Xiao[孝], how to do Ciai[慈愛] and so on are what Lu[慮] implies. And that is Mental simulation. In addition, Lu[慮] is a process of thinking which excludes Self-interest and pursues Public. This a process of thinking is similar to Moral deliberation, and enhances the Practical Utility of Moral knowledge.

신기능에 따른 폐외결핵의 임상적 특징과 예후

최보경 ( Bo Kyung Choi ),이희선 ( Hee Sun Lee ),황인혜 ( In Hye Hwang ),신경화 ( Kyung Hwa Shin ),최문기 ( Mun Ki Choi ),최보광 ( Bo Gwang Choi ),안강희 ( Kang Hee Ahn ),남형석 ( Hyung Seok Nam ),황종민 ( Jong Min Hwang ),성은영 ( 대한내과학회 2010 대한내과학회지 Vol.79 No.4

Background/Aims: There is an increased risk of tuberculosis (TB) with impaired cellular immunity and extrapulmonary TB is more common in patients with chronic kidney disease. We explored the clinical features and treatment outcomes of extrapulmonary TB according to renal function. Methods: This retrospective study reviewed the medical records of patients diagnosed with extrapulmonary TB between January 2003 and December 2007. We classified the patients into two groups using the glomerular filtration rate (eGFR), estimated using the Modification of Diet in Renal Disease (MDRD) formula cut-off of 60 mL/min/1.73 m2 and evaluated their clinical features, treatment outcome and mortality (Group I vs. Group II, ≥ 60 mL/min/1.73 m2). Results: The mean eGFR of Groups I (n=30) and II (n=312) was 34±19 and 102±26 mL/min/1.73 m2, respectively. The pleura was the most frequent site of TB in both groups (Group I, 30.0% vs. Group II, 28.2%; p=0.379). There was no treatment failure or recurrence in either group. The mortality was higher in Group I (22.2% vs. 2.8%; p<0.01). In a multivariate analysis, eGFR<60 mL/min/1.73 m2 was an independent risk factor for mortality (HR=11.51, CI 2.512-52.741; p=0.002). Conclusions: Mortality related to extrapulmonary TB was higher in patients with impaired kidney function and kidney function was an independent predictor. However, there was no difference in treatment failure and recurrence according to renal function. (Korean J Med 79:387-393, 2010)

율곡 『經筵日記』에 나타난 士의 召命意識

최보경(Choi, bokyung) 한국동양철학회 2021 동양철학 Vol.- No.55

이 논문은 율곡『經筵日記』에서 보이는 ‘士’로서의 召命意識에 대해 고찰한 것이다. 율곡은 높은 도덕의식과 강한 자의식을 바탕으로 관료로서 소임을 다하여 安民을 실현하고자 한 성리학자이다. 성리학은 강한 도덕의식을 갖추어야 한다는 당위성에 합의할 수 있는 학문적 기반이었으며, 성리학자들의 정치참여 의식은 內聖과 外王의 균형적 이행의 문제이자 유학자로서의 소명의식에서 비롯되었다. ‘士’ 계층의 召命意識은 율곡의『經筵日記』에서 구체적으로 확인할 수 있다.『경연일기』는 經筵 석상에서의 기록뿐만 아니라, 국가 전체의 각종 사건들과 함께 ‘謹安’의 형식으로 율곡의 다양한 제언들과 인물평, 현실에 대한 탄식과 시대적 위기감 등이 진솔하게 표현된 저서이다. 율곡의 거침없는 간언과 인물평 등은 임금이라는 권위를 무색하게 하기도 했으며 결국에는 士林 분열과정에서 공격대상이 되는 원인이 되었다. 이 논문에서는 높은 도덕의식을 기반으로 한 ‘士’의 시대적 召命意識을 율곡의 『經筵日記』에서 탐색하고자 한다. 첫째, 유학자들의 ‘사’로서의 소명의식에 대해 고찰하고자 한다. 둘째, 16세기 조선에서 요구되는 ‘사’의 정치적 역할에 대한 율곡의 견해를 확인하고자 한다. 셋째, 安民을 목적으로 한 다양한 현실적 개혁법안에 대해 탐색할 것이다. ‘사’로서 保國과 安民을 위해 政事의 근본을 세우고자 한 책임의식은 당연히 현실을 반영한 각종 개혁법안과 실현일 것이다. 따라서 『경연일기』에 나타난 율곡의 시대적 위기의식과 각종 제언 등이 ‘사’로서의 소명의식에서 비롯되었다는 것을 확인할 수 있을 것이다. The aim of this paper is to clarify that the calling [召命意識] of Shi [士] on Yulgok’s Gyeongyeon Ilgi [經筵日記] (A Diary of Lectures before the Throne). Yulgok is Neo-Confucianist, he tried to save the people [民] based on high moral consciousness and strong selfconsciousness. His consciousness of political participation starts from The calling of a confucianist. The calling [召命意識] of Shi [士] can be found in Gyeongyeon Ilgi [經筵日記]. This book is the record of lectures before the Throne. In this book, Yulgok describes various incidents, various character reviews, and institutional reform proposals. I would like to organize my thesis in the following manner. First, the purpose of this study is to examine The calling of Confucianist. Second, I would like to analyze Yulgok s proposal for the recruitment of wise human resources. Lastly, I will consider various feasible reform legislation. Therefore, You will be able to confirm The calling [召命意識] of Shi [士]

태권도 공인품새 앞차기동작을 통한 심판판정 현황 분석

최보경(Choi, Bo kyung),허보섭(Heo, Bo-Seob),이효택(Lee, Hyo-Taek),박찬호(Park, Chan-Ho),김용재(Kim, Yong-Jae) 동북아시아문화학회 2016 동북아시아문화학회 국제학술대회 발표자료집 Vol.2016 No.7

The military arts Taekwondo boasts a long history and a deep-rooted tradition. According to data from the World Taekwondo Headquarters(Kukkiwon), it must be represent Korea. However, training Poomsae has crumbled and recently problems of fairness and consistency steadily raised that is judges" judgments in poomsae competition. In this paper, we study about the Judges" judgments through Apchagi(front kick) motion in the Taekwondo Approved-Poomsae and would like to propose some improvement for the better in the poomsae game. Increasing the credibility could be one of the methods to boost the poomsae all over the world.

식사평가 웹사이트의 활용 및 평가

최보경(Bo Kyoung Choi),현태선(Tai Sun Hyun) 충북대학교 생활과학연구소 2012 생활과학연구논총 Vol.16 No.2

The purpose of this study was to investigate dietary habits and nutrient intake of college students through 'idiet' website and evaluate satisfaction of the website. The subjects were 166 students who registered 'food and nutrition' as a general education course in Chungbuk National University. Dietary habits, dietary attitudes, food frequency, and dietary intake were investigated through the 'idiet' website by himself/herself. More than two thirds(69.3%) of the subjects were categorized as 'poor' in dietary habits, and 36.7% were categorized as 'poor' in dietary attitudes. Nutrient intakes were estimated on the website when the students chose the name and the amount of the foods they ate during 24 hours with the help of real-size photos provided on the website. Mean daily energy intakes were 2,146 kcal, and 1,667 kcal in male and female students, respectively, which were comparable with those published in the previous studies estimated though a 24-hour recall or a food record method. Mean daily intakes of vitamin C, riboflavin and calcium were less than 75% of Recommended Intakes. Nutrient intakes of the subjects who were categorized as 'good' in dietary habits and food frequency were significantly higher than those who were categorized as 'poor'. The usefulness of the contents were evaluated by the subjects after using the website and the results showed that the usefulness score of nutrient intake assessment was high. Seventy five percents of the subjects answered that the website might be helpful for weight control, and 71.7% would recommend this website to others, and 68.1% would revisit this website. These results showed that the website might be useful for examining dietary habits, dietary attitudes, food frequency, and dietary intake of college students.