Extraction of γ-oryzanol from rice bran using diverse edible oils: enhancement in oxidative stability of oils

이보라,김미자 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.3

Diverse edible oils including perilla, corn, soybean, canola, sunflower, olive, and grape seed oils were mixed with heat-stabilized rice bran to extract c-oryzanol from the rice bran. The oxidative stabilities of the oils with or without extraction were compared by analyzing the headspace oxygen content, conjugated dienoic acid (CDA) values, and p-anisidine values (p-AV). Grape seed oil extracted significantly high c-oryzanol content while canola oil extracted lowest c-oryzanol content (p\0.05). All the solvent oils except corn oil possessed enhanced oxidative stability at 100 C after extracting c-oryzanol from stabilized rice bran, based on the results of the headspace oxygen depletion and CDA methods. However, all the recovered oils had high p-AV than vegetable oils. Especially, perilla oil had an exceptionally high p-AV, which may be due to its high linolenic acid content.

Anesthetic management of a patient with obstructive prosthetic aortic valve dysfunction -a case report-

이보라,이정림,김민수 대한마취통증의학회 2014 Korean Journal of Anesthesiology Vol.66 No.2

We present a 55-year-old female patient who underwent burr-hole drainage due to chronic subdural hematoma, with obstructive prosthetic aortic valve dysfunction. Anesthetic management of a patient with severe obstructive prosthetic aortic valve dysfunction can be challenging. Similar considerations should be given to patients with aortic stenosis with an additional emphasis on thrombotic complication due to discontinuation of anticoagulation, which may further jeopardize the valve dysfunction. This case emphasizes the importance of a comprehensive understanding of the etiology and hemodynamic consequences of obstructive prosthetic valve dysfunction and the adequacy of anticoagulation for patients undergoing noncardiac surgery even after a successful valve replacement.

한국판 일유인가 척도 타당화 연구

이보라,Eunjoo Kim 한국상담심리학회 2019 한국심리학회지 상담 및 심리치료 Vol.31 No.1

진로의 발달을 동기적 관점에서 이해하고 향후 실증연구를 진행하기 위한 첫 단계로서 본 연구에서는 Porfeli와 동료들(2012)이 제안한 일유인가 개념을 소개하고, 그들이 개발한 일유인가 척도를 번안하여 타당화하였다. 일유인가란 일하는 것에 대해 얼마나 끌리는 지 혹은 멀리하고 싶은지를 나타내는 개념으로서, 일유인가의 정도에 따라 청소년이나 청년들의 진로발달에 영향을 미칠 것이라는 이론적 토대에서 나온 개념이다. 일유인가 척도를 타당화하기 위해 본 연구는 대학생 332명과 고등학생 324명을 대상으로 연구를 수행하였으며, 자료의 분석은 원 척도의 요인구조를 자료에 대입하여 합치도를 알아보는 확인적 요인분석을 실시하였다. 연구결과, 부정-긍정유인가의 2요인 모형과 일유인가의 1요인 구조모형이 모두 비교적 타당한 것으로 드러났다. 또한, 대학생과 고등학생을 대상으로 했을 때 두 집단 모두에게 적합한 요인구조임을 알 수 있어 일유인가에 대한 개념이 청소년과 성인기에게 모두 적절하게 적용될 수 있음을 시사하였다. 본 연구의 제한점에 대해 논의하였으며 향후 연구의 방향에 대해 제언하였다. Work valence refers to the degree of attractiveness and aversiveness of working. Work valence is a concept derived from a motivational perspective, which provides a useful framework to understand career-related behaviors. The current study was designed to validate a work valence scale developed by Porfeli and his colleagues (2012) with a sample of Korean adolescents and young adults. We used a sample of 332 college students and 324 high school students to fit two models of work valences. Results revealed that both a two-factor hierarchical model and a one-factor hierarchical model fit well. Moreover, when we tested for invariance between two different age groups, we found that both groups had the same factor structure and factor loadings. Implications for future research are discussed.

리튬이온전지 음극용 SiOx 나노입자의 조대화를 통한 전기화학 특성 향상

이보라,이재영,장보윤,김준수,김성수 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.1

SiOx nanoparticles were granulated, and their microstructures and effects on electrochemical behaviors wereinvestigated. In spite of the promising electrochemical performance of SiOx, nanoparticles have limitations such as highsurface area, low density, and difficulty in handling during slurry processing. Granulation can be one solution. In thisstudy, pelletizing and annealing were conducted to create particles with sizes of several decades of micron. Decrease insurface area directly influences the initial charge and discharge process when granules are applied as anode materials forLi-ion batteries. Lower surface area is key to decreasing the amount of irreversible phase-formation, such as Li2Si2O5,Li2SiO3 and Li4SiO4, as well as forming the solid electrolyte interface. Additionally, aggregation of nanoparticles isrequired to obtain further enhancement of the electrochemical behavior due to restrictions that there be no Li4SiO4-relatedreaction during the first discharge process. SiOx 나노입자를 조대화(granulation)하여 미세구조와 전기화학적 특성을 조사하였다. 리튬이온전지에서 음극재인 SiOx 나노입자는 사이클 특성이 안정적임에도 불구하고, 나노입자는 높은 비표면적, 낮은 전극밀도 및 슬러리 공정적용의 어려움이라는 단점을 가지고 있다. 이를 해결하기 위해, 나노입자를 마이크로 크기의 입자로 가공하였다. 펠레타이징(pelletizing) 및 열처리(annealing)를 통해, 수십 마이크로 크기의 입자로 조대화(aggregation based granulation)하였다. 비표면적의 감소는 리튬이온전지의 음극재로 사용되는 경우, 초기 충전 및 방전 과정에 직접적인 영향을 미친다. 나노입자의 낮은 비표면적은 SEI layer를 다량 형성할 뿐만 아니라, Li2Si2O5, Li2SiO3, 및 Li4SiO4와 같은 비가역상을 형성한다. 충분한 열처리로 인해 조대화된 경우, 입도 및 밀도가 증가하여 비가역상의 형성을 억제하고, 결정질 Si의 양을 증가시켜, 보다 많은 가역상 확보가 가능하였다. 결과적으로, 단순한 조대화만으로 나노입자의 전기화학특성 향상을 가져올 수는 없으며, 최소한의 결정구조 및 입도변화가 수반될 경우에만 기대했던 전기화학특성 향상을 가져올 수 있다는 것을 확인하였다.

부정맥의 뜸 치료 효과에 대한 체계적 문헌고찰

이보라,황주영,권정남 대한한의학회 2019 대한한의학회지 Vol.40 No.3

Objectives: The purpose of this study was to assess the effects of moxibustion treatment for Cardiac arrhythmia through a systematic review. Methods: Electronic database including Cochrane library, Pubmed, China National Knowledge Infrastructure, Embase, DBpia, and Korean studies Information Service System were searched by combining the keywords such as “arrhythmias”, “cardiac arrhythmias”, “心律失常”, “moxibustion” and “艾灸”. Through the searching, 5 randomized controlled trials(RCTs) were included except animal testing and cellular experiment etc. The quality of each RCTs was assessed using the Cochrane risk of bias tool. Results: We included 5RCTs involving 468 participants. Two RCTs compared moxibustion versus conventional treatment, another RCT compared moxibustion plus acupuncture versus conventional treatment, another RCT compared moxibustion plus herbal medicine verus conventional treatment, the other RCT compared moxibustion plus herbal medicine and ointment versus conventional treatment. These studies were evaluated by the efficacy rate of treatments. Studies measured outcomes in efficacy, heart rate, electrocardiogram and symptoms. Each of 5 trials statistically showed a significant differences in efficacy rate. One study reported about side effects and another study reported about complications. The overall risk of bias was unclear in 5 studies. Conclusions: The evidence suggests that moxibustion treatment may help to reduce cardiac arrhythmia, however, it is limited, low-certainty and we cannot rule out benefits or risks with this treatment. High-quality studies that report adverse effects are needed.

산림 총일차생산량 예측의 공간적 확장을 위한 인공위성 자료와 기계학습 알고리즘의 활용

이보라,김은숙,임종환,강민석,김준 대한원격탐사학회 2019 大韓遠隔探査學會誌 Vol.35 No.6

Forest covers 30% of the Earth’s land area and plays an important role in global carbon flux through its ability to store much greater amounts of carbon than other terrestrial ecosystems. The Gross Primary Production (GPP) represents the productivity of forest ecosystems according to climate change and its effect on the phenology, health, and carbon cycle. In this study, we estimated the daily GPP for a forest ecosystem using remote-sensed data from Moderate Resolution Imaging Spectroradiometer (MODIS) and machine learning algorithms Support Vector Machine (SVM). MODIS products were employed to train the SVM model from 75% to 80% data of the total study period and validated using eddy covariance measurement (EC) data at the six flux tower sites. We also compare the GPP derived from EC and MODIS (MYD17). The MODIS products made use of two data sets: one for Processed MODIS that included calculated by combined products (e.g., Vapor Pressure Deficit), another one for Unprocessed MODIS that used MODIS products without any combined calculation. Statistical analyses, including Pearson correlation coefficient (R), mean squared error (MSE), and root mean square error (RMSE) were used to evaluate the outcomes of the model. In general, the SVM model trained by the Unprocessed MODIS (R = 0.77 – 0.94, p < 0.001) derived from the multi-sites outperformed those trained at a single-site (R = 0.75 – 0.95, p < 0.001). These results show better performance trained by the data including various events and suggest the possibility of using remote-sensed data without complex processes to estimate GPP such as non-stationary ecological processes. 산림생태계 내의 총일차생산량은 산림 자원 생산량과 직결되고, 산림생태계의 건강성, 산림식물계절및 생태계 서비스의 중요한 지표가 된다. 이 연구에서는 인공위성 자료와 기계학습 알고리즘을 활용하여 우리나라의 산림유역의 총일차생산량을 연구하였다. 에디공분산 타워가 있는 6개 지점에서의 MODIS (Moderate Resolution Imaging Spectroradiometer) 산출물과 에디공분산타워의 총일차생산성으로 연구기간의 75%–80%에해당하는 자료로 기계학습 알고리즘을 훈련하고 나머지 기간으로 구축된 모델의 총일차생산성 예측 결과를검증하였다. 모델을 구축할 때 MODIS 지상 산출물과 대기 산출물을 조합하여 새로운 입력자료(e.g., 포화수증기압차)를 모델의 입력자료(Processed MODIS)로 사용하였을 때와 이러한 과정 없이 QC(Quality control)만 거친 MODIS 산출물을 그대로 입력자료(Unprocessed MODIS)로 사용하였을 때의 총일차생산량을 비교해 보고그 활용 가능성에 대해 고찰하였다. 추가로 MODIS 총일차생산량 산출물(MYD17)과 에디공분산 총일차생산성 및 기계학습 알고리즘 기반의 총일차생산성과의 상관관계를 보고 그 적합성에 대해 논의하였다. 이 연구에서 사용된 기계학습 알고리즘은 Support Vector Machine (SVM)으로 산림생태계 연구에서 가장 많이 사용되고있는 기계학습 알고리즘 중 하나이다. 기계학습 알고리즘 기반(SVM 모델)의 총일차생산량 예측 결과는MODIS 총일차생산량 산출물(MYD17)보다 에디공분산 총일차생산량과 전반적으로 높은 상관관계를 보였고특히 식생 성장을 시작하는 시점의 값을 좀 더 잘 예측하는 결과를 보였다. 단일 지역에서 Unprocessed MODIS 입력자료로 훈련된 SVM 모델 결과는 피어슨 상관계수 0.75 – 0.95 (p < 0.001), 6개의 연구 지점에서 훈련된 SVM 모델 결과는 피어슨 상관계수 0.77 – 0.94 (p < 0.001) 사이를 보였다. 이 결과는 훈련 자료에 다양한 이벤트들이포함되면 모델의 예측력이 향상되는 가능성을 보여주었고 위성영상의 산출물을 재계산하여 새로운 산출물을내는 과정을 거친 위성 자료가 아니어도 그 예측력에는 크게 문제가 없음을 보여주었다.

A Psychological Reading of the Rhetoric in Shakespeare’s The Rape of Lucrece

이보라 한국영미문화학회 2013 영미문화 Vol.13 No.3

This paper, with an emphasis placed on Shakespeare’s rhetorical strategies, makes an attempt to read The Rape of Lucrece by way of analyzing the formal and structural principles of Shakespearean language. This approach sheds new light on Tarquin’s mind, which operates on several different levels. It also argues that the construction of the rhetoric is correlated to the thematic design of the poem. Tarquin’s mind is displayed by Shakespeare’s microscopic attention to every movement of his heart and mind, which reveals what he is: his mentality, his attitude toward life, and his relationship with people as prince. The reason that people continue to appreciate the poem through ages is, in this work, Shakespeare illustrates what man is: that is, Shakespeare’s rhetorical technique reflects the way people reason with their wrong doings, shifting the blame onto the victim. Thus, Tarquin’s absurd logic in his rationalization detected later in the poem is not out of character. Shakespeare gives us a full picture of Tarquin’s disposition before showing the rape scene.

여군의 출산의지에 영향을 미치는 요인 연구

이보라,이정자 한국군사회복지학회 2019 한국군사회복지학 Vol.12 No.2

The purpose of this study is to identify pregnancy will through casual approach to the environmental factors of childbirth and birth of married or unmarried female soldier under 20 to 40 years old. The willingness to give birth, which is a dependent variable, was measured by the will of the individual to give birth and the key independent variables were empirically analyzed by the military childbirth encouragement policy and values for marriage and children. An analysis of the relationship between the factors of the maternity environment and the willingness to childbirth showed that, first, perception of the military birth promotion policy, and values for marriage and children were above average. Second, the analysis of differences between groups of military childbirth encouragement policy based on their individual characteristics showed that married groups were more aware of facts and figures such as support for pregnancy and childbirth conditions, support for work and family life, support for family members, and creation of social and cultural programs than unmarried groups. In the case of work and family support, the older the group, the higher the awareness of policy so that there were significant differences between the groups. Third, as a result of analyzing the differences in the pregnancy will among the groups according to their personal characteristics, married people have higher willingness to have children than unmarried people, and the higher the level of education, the stronger the place of childbirth. Fourth, the higher the level of education, the more positive the value of children, the more positive the perception of work and family compatibility, the more positive the factors that strengthen the pregnancy will. On the basis of these results, this study identified the need for a customized model of the military's birth encouragement policy and improvement of the fertility environment necessary to increase the female soldiers’ pregnancy will. This study suggests that various approaches of policy are necessary to take into account the various occupational characteristics and to raise the fertility rates. 본 연구는 20~40세 이하의 기혼·미혼 육군여군의 출산 환경요인과 출산과의 인과적인 접근을 통해 출 산의지를 파악하는데 목적이 있다. 종속변수인 출산의지는 출산을 하고자 하는 개인의 의지로 측정하고, 주요 독립변수로는 군에서 실시하고 있는 출산장려정책과 결혼 및 자녀에 대한 가치관으로 설정하여 실증 분석하였다. 여군의 출산환경 요인과 출산의지와의 관계를 분석한 결과, 첫째, 출산의지, 군 출산장려정책 에 대한 인식, 결혼 및 자녀에 대한 가치관의 평균은 보통 이상의 수준을 보이는 것으로 나타났다. 둘째, 개인적 특성에 따른 군 출산장려정책의 집단 간 차이 분석 결과, 기혼집단이 미혼집단에 비해 임신 및 출산 여건지원, 일과 가정생활양립지원, 가족지원, 사회문화조성 등 군 출산장려정책의 세부 항목에 대한 인식이 높게 나타났다. 그중 일과 가정생활양립지원의 경우는 연령이 높은 집단일수록 정책에 대한 인식이 높게 나타나 집단 간 유의미한 차이가 있는 것으로 나타났다. 셋째, 개인적 특성에 따른 집단 간 출산의지 차이 분석 결과, 미혼보다는 기혼이 출산의지가 높고, 교육수준이 높을수록 출산의지가 강한 것으로 분석되었다. 넷째, 출산의지에 영향을 미치는 요인으로는 교육수준이 높을수록, 자녀에 대한 가치관이 긍정적일 수록, 일과 가정생활양립지원, 임신 및 출산지원에 대한 인식이 긍정적일수록 출산의지를 강하게 하는 요인으로 나타났다. 이를 바탕으로 본 연구는 여군들의 출산의지를 높이기 위해 필요한 출산환경개선과 군 출산장려 정책의 맞춤형 모델의 필요성을 확인하였다. 본 연구에서는 다양한 직업적 특성을 고려하고 출산율을 높이 기 위한 정책의 다양한 접근이 필요함을 시사한다.

리튬이온전지 음극소재용 실리콘산화물 입자의 비표면적이 전기화학특성에 미치는 영향

이보라,김낙원,장보윤,김성수,김준수 한국에너지학회 2019 한국에너지공학회 학술발표회 Vol.2019 No.5

리튬이온전지 음극용 SiO_x 나노입자의 조대화를 통한 전기화학 특성 향상

이보라,이재영,장보윤,김준수,김성수,Lee, Bora,Lee, Jae Young,Jang, Boyun,Kim, Joonsoo,Kim, Sung-Soo 한국전기전자재료학회 2019 전기전자재료학회논문지 Vol.32 No.1

$SiO_x$ nanoparticles were granulated, and their microstructures and effects on electrochemical behaviors were investigated. In spite of the promising electrochemical performance of $SiO_x$, nanoparticles have limitations such as high surface area, low density, and difficulty in handling during slurry processing. Granulation can be one solution. In this study, pelletizing and annealing were conducted to create particles with sizes of several decades of micron. Decrease in surface area directly influences the initial charge and discharge process when granules are applied as anode materials for Li-ion batteries. Lower surface area is key to decreasing the amount of irreversible phase-formation, such as $Li_2Si_2O_5$, $Li_2SiO_3$ and $Li_4SiO_4$, as well as forming the solid electrolyte interface. Additionally, aggregation of nanoparticles is required to obtain further enhancement of the electrochemical behavior due to restrictions that there be no $Li_4SiO_4$-related reaction during the first discharge process.