Single-walled carbon nanotube (SWNT) has gained significant interest as a transducer in various electrochemical sensing devices due to their unique structure, compatibility with biomolecules, and excellent electronic properties. As-prepared SWNTs are usually a mixture of semiconducting and metallic ones. Despite of the higher content of semiconducting components in mixed SWNTs, metallic properties are predominantly expressed due to the bundling issue of the SWNT during the fabrication process, limiting the applicability to bio-transistor application. Here, we present a multi-scale semiconducting electronic film of SWNTs as a transducing platform for electrochemical field-effect-transistor (eFET) suitable for the sensitive detection of subtle biological modulation. A genetically engineered filamentous M13 phage showing strong binding affinity toward SWNTs on its body surface was used as a biological material, allowing us to fabricate a large-scale transparent semiconducting nanocomposite. As the relative ratio of SWNT to M13 phage decreases, the on–off ratio of SWNT electronic film increases by 1200%. To show broad applicability, the multi-scale SWNT nanomesh-based eFET is applied for monitoring a variety of biological reactions in association with enzymes, aptamers, and even cyanobacteria. The biomimetic electronic material system with the capability of transducing biological responses at a large scale over a broad dynamic range holds excellent promise for biosensors, biofuel cells, and environment monitoring.

In this study, we investigate the opportunity of using waste tire char as a cathode material for lithium-ion primary batteries (LPBs). The char obtained by carbonizing waste tires was washed with acid and thermally fluorinated to produce CFX. The structural and chemical properties of the char and CFX were analyzed to evaluate the effect of thermal fluorination. The carbon structure of the char was increasingly converted to CFX structure as the fluorination temperature increased. In addition, the manufactured CFX- based LPBs were evaluated through electrochemical analysis. The discharge capacity of the CFX reached a maximum of 800 mAh/g, which is comparable to that of CFX- based LPBs manufactured from other carbon sources. On the basis of these results, the use of waste tire char-based CFX as a cathode material for LPBs is presented as a new opportunity in the field of waste tire recycling.

본 연구는 아시아의 국제관계가 변화하는 맥락에서 "아시아 나토"의 실 행 가능성과 잠재적 영향을 검토한다. 아시아 버전 나토의 가능성을 분 석하기 위해 세 가지 목표를 추구한다: (1) 나토의 성격을 조사하고 아시 아에서의 잠재적 적용을 검토한다, (2) 세력균형이론과 위협균형이론의 관점에서 나토의 과거 실패를 검토한다, (3) 정치와 군사적 도전을 고려 한 아시아 나토의 실행 가능성을 평가한다. 이 연구는 미국과 일본을 중 심으로 아시아 나토에 대한 관심이 증가한 지정학적 변화를 탐구한다. 현재 미중 균형과 위협 사이의 균형은 양자 및 삼자 동맹을 설정하는 데 이르렀지만 아시아 나토의 가능성은 여전히 쉽지 않다. 그러나 중국이 지역 패권 추구로 인한 압도적인 외부 위협을 초래하면, 아세안 국가들 은 집단 안보 체제에 가입할 수 있다. 본 논문은 특히 이러한 상황에서 한국이 직면할 수 있는 문제점에 대해서도 지적한다.

This study gathered basic information on the development of Jiu-Jitsu uniforms suitable for players in Korea. Detailed data were collected between December 20th and December 30th, 2022 on 21 selected brands sold in online shopping malls. For each, information was recorded on the production country, product type, price, colors, material, and sizing system. A total of 612 datasets were analyzed using frequency analysis, cross-tabulation, and Chi-square tests. Jiu-Jitsu uniforms were classified as either standard or limited edition. Limited edition uniforms were more expensive than regular uniforms. International brands had a higher price range than domestic brands. The most commonly used colors for Jiu-Jitsu uniforms were the regulation colors associated with the sport: white, black, and blue. Domestic brands were more likely to use non-regulation colors than international brands. The material used for the top half of the uniform was predominantly pearl weave, while the bottom half was usually ripstop. International brands used a more diverse range of materials than domestic brands. The Jiu-Jitsu uniform sizing system incorporated a range of sizes between A00 and A6. While sizing designations differed according to the established sizing systems of different countries, the sizes remained the same, as did the range of sizes available. Where size guides were provided, height and weight were used to help the customer determine the appropriate size. The dimensions of each size varied between brands. Overall, we found that international brands offer a more diverse range of Jiu-Jitsu uniform designs than domestic brands.

The Body Appreciation Scale-2 (BAS-2) measures the extent to which individuals feel, accept, and respond to their own bodies in a positive manner. Given the research need to explore positive body image and its associations with various sociocultural factors and related consequences among individuals with various cultural backgrounds, several studies have established the psychometric properties and factor structures of the BAS-2 in different languages and samples with different characteristics. The current study investigated the psychometric properties and measurement invariance of a Korean version of the BAS-2 in an older Korean adult population (599 older Korean adults with the average age of 70 years). Data were collected using both online and offline (paper-based) survey questionnaires. The results of exploratory factor analyses and confirmatory factor analysis evidenced the unidimensional factor structure and measurement invariance of the Korean BAS-2 among older Korean men and women, after dropping item 1. Scalar invariance was supported across gender, and men and women did not significantly differ in observed mean scores of the Korean BAS-2. The results also supported good convergent validity and criterion validity. Incremental validity was demonstrated by predicting self-esteem over and above measures of age, BMI, subjective financial and health status, body esteem, and ageism. High internal reliability and test-retest reliability over a 2-week period were confirmed. Overall, the results of this study support the reliable use of a Korean BAS-2 to measure positive body image among older Koreans after excluding item 1.

목적 : 본 연구는 만 50세 이상 성인에서 녹내장, 황반변성, 당뇨병성망막병증의 의사진단여부와 삶의 질의 관 련성을 알아보고자 하였다. 방법 : 국민건강영양조사 제7기(2016~2018) 자료 중 만 50세 이상의 성인으로 녹내장, 황반변성, 당뇨병성망 막병증의 의사진단여부에 따라 현재의 건강상태를 묻는 EQ-5D와의 관계를 분석하였으며, p<0.050인 경우 유의 한 값으로 판단하였다. 결과 : 녹내장, 황반변성, 당뇨병성망막병증에 영향을 주는 요인은 공통적으로 연령이었다. 이들 안질환과 삶의 질의 관계에서 녹내장과 당뇨망막병증은 일상 활동에서의 불편함이 있는 것으로 보였으나 통계적 유의성은 없었 다. 반면 황반변성은 자기관리 능력을 상실시킬 수 있는 위험이 유의하게 큰 것으로 나타났다[Odds ratio: 2.56(95% CI:1.05-6.25)]. 결론 : 본 연구에서 녹내장, 황반변성, 당뇨망막병증과 같은 주요 안질환은 연령과 관련이 있으며, 황반변성은 자기관리능력과 같은 삶의 질을 저하시킨다는 것을 확인하였다

본 논문은 랠프 월도 에머슨이 주장하는 자연과 상상력의 개념에 초점을 맞 추어 초월주의를 연구하고 이를 바탕으로 내서니얼 호손의 주홍글자를 해석 하고자 한다. 에세이 “자연”에서 에머슨은 시각을 통해 전달된 자연의 아름다움 은 자연의 최종적 표현이 아니라 유기적 부분으로 존재하며, 자연이 그의 아름 다움 혹은 숭고함과 같은 추상적인 창조물 그리고 그의 동식물 혹은 인간과 같 은 지적인 창조물과 유기적 관계를 갖는 것은 ‘보편적 존재’의 신성한 영이 자 연과 인간 모두에게 깃들어있기 때문에 가능하다고 말한다. 에머슨의 사상에서 무엇보다도 상상력은 중요한 위치를 차지하고 있다. 상상력은 인간의 정신을 열 어 자연을 생각에 맞추어주는 열쇠이며 상상력을 사용할 때 인간은 자연에 대 해 우위를 점할 수 있다. 자연의 평범한 풍경은 상상력을 통해 인간의 정신에 신성이 깃든 상징으로 변형된다. 주홍글자에서 에머슨의 자연과 상상력의 개 념은 특히 헤스터와 그녀의 딸인 펄을 통해 나타난다. 헤스터는 자연과 벗하며 고독한 생활을 하는 동안 내면이 단련되고 상상력이 예민해진다. 펄은 자연의 아이라고 불릴 만큼 세상에 물들지 않은 순수한 존재로서, 그녀는 숲에서 동식 물, 즉 다른 자연의 부분들과 깊은 교감을 나누는 동안 상상력이 무한대로 확장 되면서 ‘보편적 존재’와 합일하는 순간을 경험한다. 이들을 통해 드러나는 자연 은 신성이 깃든 그리고 자비로운 존재이다.

The large process plant is currently implementing predictive maintenance technology to transition from the traditional Time-Based Maintenance (TBM) approach to the Condition-Based Maintenance (CBM) approach in order to improve equipment maintenance and productivity. The traditional techniques for predictive maintenance involved managing upper/lower thresholds (Set-Point) of equipment signals or identifying anomalies through control charts. Recently, with the development of techniques for big analysis, machine learning-based AAKR (Auto-Associative Kernel Regression) and deep learning-based VAE (Variation Auto-Encoder) techniques are being actively applied for predictive maintenance. However, this predictive maintenance techniques is only effective during steady-state operation of plant equipment, and it is difficult to apply them during start-up and shutdown periods when rises or falls. In addition, unlike processes such as nuclear and thermal power plants, which operate for hundreds of days after a single start-up, because the pumped power plant involves repeated start-ups and shutdowns 4-5 times a day, it is needed the prediction and alarm algorithm suitable for its characteristics. In this study, we aim to propose an approach to apply the optimal predictive alarm algorithm that is suitable for the characteristics of Pumped Storage Power Plant(PSPP) facilities to the system by analyzing the predictive maintenance techniques used in existing nuclear and coal power plants.

This study aimed to build on past findings about differences in personal walking experiences by demonstrating what elements were beneficial to participants with different walking habits. Accordingly, this study established the relationships between valued walking elements and people’s motivation to walk, by dividing participants into three groups: Group W for people with a walking habit, Group HW for people who walk occasionally but not regularly, and Group NW for people who do not walk habitually. Participants walked a familiar and an unfamiliar route with a wearable device that recorded their heart-rate variability and electrodermal activity. Changes in the biometric data helped to identify the defining moments in each participant’s walk. Participants discussed these moments in one-on-one interviews with a researcher to pinpoint their valued walking elements. As a result, this study classified walking elements into six themes: “Surroundings,” “Social,” “Exploration,” “Route Plan,” “Physical Exercise,” and “Mental Thinking.” A walking habit development model was made to show how “Route Plan” and “Exploration” were beneficial to Group NW, “Social” and “Surroundings” were beneficial to Group HW, and “Route Plan,” “Mental Thinking,” and “Physical Exercise” were beneficial to Group W.

Technology innovation companies are focusing on contributing to business performance by R&D project as a strategic tool. Successful R&D leads to corporate competitiveness enhancement, national industrial development, but there are high uncertainty and risks in R&D. Public and private R&D projects are carried out to achieve various purposes. It was verified how the risk management and benefit management of the R&D project affect the detailed R&D project performance between the Public and private domain. The impact of Project Leadership on R&D performance was also analyzed. Those who have participated in the Public and Private R&D projects at companies or research institutes were surveyed. First, it was found that project risk and benefit management have partially an effect on R&D project performance. Second, Public and private R&D Project Leadership showed partially a interaction effect between project management and project performance.

본 연구는 중국의 ESG 연구동향, 정부의 제도와 정책, 그리고 시스템과 전략, 성과와 취약점을 분석하 고 이해함으로써 우리나라의 ESG 정책과 전략을 수립하는 데 이론적·정책적 논거로 활용하는 것을 목적으 로 한다. 본 연구는 2015년부터 2022년까지 중국 내 ESG 관련 주요 연구를 수집하여 주제 및 연도별 분류ㆍ검토를 수행했다. 이를 통해 중국 내 시기별 ESG 집중 연구 주제가 변화했고, 중국 정부가 ESG를 국가의 고품질 발전을 위한 중요한 조치로 인식하고 있음을 확인했다. 본 연구는 중국 정부의 ESG 관련 연구 동향과 정책 실시를 고찰한 한국 최초의 연구라고 할 수 있다.

Recently in Korea, YouTube stock channels increased rapidly due to the high social interest in the stock market during the COVID-19 period. Accordingly, the role of new media channels such as YouTube is attracting attention in the process of generating and disseminating market information. Nevertheless, prior studies on the market forecasting power of YouTube stock channels remain insignificant. In this study, the market forecasting power of the information from the YouTube stock channel was examined and compared with traditional news media. To measure information from each YouTube stock channel and news media, positive and negative opinions were extracted. As a result of the analysis, opinion in channels operated by media outlets were found to be leading indicators of KOSPI market returns among YouTube stock channels. The prediction accuracy by using logistic regression model show 74%. On the other hand, Sampro TV, a popular YouTube stock channel, and the traditional news media simply reported the market situation of the day or instead showed a tendency to lag behind the market. This study is differentiated from previous studies in that it verified the market predictive power of the information provided by the YouTube stock channel, which has recently shown a growing trend in Korea. In the future, the results of advanced analysis can be confirmed by expanding the research results for individual stocks.

Because multiple ovulation embryo transfer (MOET) in cattle includes several benefits such as wide spreading of genetically superior offspring for long distance, this biotechnological method has been widely applied to Hanwoo. When the recipients are not stayed close after embryo recovery from donor, the embryos are moved to other farms via several vehicles (car, train, and airplane). However, air travel induces lesser oxygen level, increased vibration, lower air pressure, higher noise, and increased exposure of cosmic radiation to living things than ground level. It was still unknown that fresh embryos obtained from multiple ovulation of Hanwoo could maintain their fertility after being transported via air plane, the present case report introduced a clinical case of MOET in Hanwoo after shipping fresh embryos via air transportation. The donor was multi-ovulated via follicle-stimulating hormone series of injection, which was followed by a gonadotrophin-releasing hormone injection and artificial insemination twice. The embryos were recovered by the uterine flushing, packed in ministraws, transported to recipients for 6 h including 1 h air flight, and then transferred to the synchronized recipients. During pregnancy diagnosis of early gestation period, 5 of 7 recipients (71.4%) presented no heat signs and showed fetal sacs with fluid under transrectal ultrasonography. After normal gestation period, all recipients naturally delivered healthy calves (male n = 2 and female n = 3) without abortion, stillbirth, and premature birth. The present case report indicated that transportation of fresh embryos for MOET via domestic flight in Korea did not affect to their fertility.

Selenium (Se) is known as an antioxidant mineral and heme iron is a major source for iron intake which can promote carcinogenesis in the body. This study was to investigate the effect of Se on heme-aggravated colon carcinogenesis in mice. Three experimental groups included control [normal diet + AOM (10 mg/kg body weight in saline)/DSS (2% in the drinking water)], [AOM/DSS + hemin (534 mg/kg body weight in CMC)], and [AOM/DSS + hemin + Se (2.82 mg/kg diet in CMC)] groups. Colonic mucosa were stained with 0.3% methylene blue and the colonic polyps, aberrant crypt (AC) and aberrant crypt foci (ACF) were counted. Lipid peroxidation in liver was evaluated by the thiobarbituric acid-reactive substances (TBARS) assay. The number of polyps in the hemin + Se group was 31.6% lower than that in the control group, and 41.4% lower than that in the hemin group. The number of AC in the hemin + Se group was 42.8% lower than that in the control group, and 49.1% lower than that in the hemin group. The number of ACF in the hemin + Se group was 49.0% lower than that in the control group, 45.7% than that in the hemin group. Hepatic TBARS level in the hemin + Se group was significantly low compared with the control group or the hemin group (p<0.05). These findings suggest that Se treatment may be protective against colon carcinogenesis promoted by a high heme-containing diet.

From 2020, Korean Animal and Plant Quarantine Agency has reset the withdrawal time (WT) for veterinary drugs typically used in livestock in preparation for the introduction of positive list system (PLS) program in 2024. This study was conducted to reset the MRL for amprolium (APL) in broiler chickens as a part of PLS program introduction. Forty-eight healthy Ross broiler chickens were orally administered with APL at the concentration of 60 mg/L (APL-1, n=24) for 14 days and 240 mg/L (APL-2, n=24) for 7 days through drinking water, respectively. After the drug treatment, tissue samples were collected from six broiler chickens at 0, 1, 3 and 5 days, respectively. Residual APL concentrations in poultry tissues were determined using LC-MS/MS. Correlation coefficient (0.99 >), the limits quantification (LOQ, 0.3~5.0 μg/kg), recoveries (81.5~112.4%), and coefficient of variations (<15.5%) were satisfied the validation criteria of Korean Ministry of Food and Drug Safety. In APL-1, APL in all tissues except for kidney was detected less than LOQ at 3 days after drug treatment. In APL-2, APL in liver and kidney was detected more than LOQ at 5 days after treatment. According to the European Medicines Agency’s guideline on determination of withdrawal periods, withdrawal periods of APL-1 and APL-2 in poultry tissues were established to 3 and 2 days, respectively. In conclusion, the developed analytical method is sensitive and reliable for detecting APL in poultry tissues. The estimated WT of APL in poultry tissues is longer than the current WT recommendation of 2 days for APL in broiler chickens.

본 연구는 좌우뇌의 활용 성향에 따라 다중지능이 어떻게 나타나는지, 모바일 웹사이트의 색채, 형태, 운동, 깊이 등의 지각 요소에 대한 반응의 차이가 어떻게 나타나는지 알아보고자 한다. 본 연구에 필요한 뇌 성향에 대한 데이터를 위하여 참여자를 모집하여 뇌 선호도 검사를 실시하였고, 이들의 다중지능을 확인하였다. 이들 을 뇌 성향별로 구분하고, 모바일 웹사이트의 지각 요소에 대해 선호도 조사를 하였고, 집단 간의 차이가 유 의미한지 확인하였다.

To understand antioxidant enzyme response of two contrasting Arundinella hirta ecotypes to drought stress, drought-tolerant Youngduk and drought-sensitive Jinju-1, were comparatively analyzed changes in the enzymatic activities of peroxidase (POD), ascorbate peroxidase (APX), catalase (CAT), superoxide dismutase (SOD), and glutathione reductase (GR). Two ecotypes, drought-tolerant Youngduk and drought-sensitive Jinju-1 were subjected to drought stress by withholding water for 12 days. ROS accumulation level and electrolytic leakage were significantly increased in both A. hirta ecotypes by drought stress treatment but less in Youngduk than Jinju-1. The RWC significantly decreased in both the drought stress-treated ecotypes as compared to control, but less in Youngduk than Jinju-1. Soluble sugar and protein content were increased more in drought stress-treated Youngduk as compared to Jinju-1. The activities of antioxidant enzymes such as SOD, CAT, POD, APX, and GR increased significantly in both the drought stress-treated ecotypes Youngduk and Jinju-1 as compared to control. The increase in antioxidant enzyme activity level was more prominent in drought stress-treated Youngduk as compared to Jinju-1. Taken together, these results suggest that Youngduk was more tolerant to drought stress than Jinju-1, and seem to indicate that tolerance of A. hirta to drought stress is associated with increased activity of antioxidant enzymes.

본 연구는 절화 도·소매업자의 판매 행태, 소비자의 소비 행태와 수입산 절화 및 국내산 절화 인식을 조사하여 국내산 절화 경쟁력 강화를 위한 자료로 제공하고자 수행하였다. 설 문 조사는 도·소매업자 102명을 대상으로 2020년 7월부터 9 월까지 진행하였고, 소비자는 200명을 대상으로 2020년 8월 24일부터 25일까지 진행하였으며, 수집된 자료는 빈도 분석, 대응표본 t-test, 다중반응 교차분석을 실시하였다. 도·소매업 자의 판매 행태 조사 결과, 국내산과 수입산 절화 모두 판매하 고 있는 비율이 높았고 판매 시 국내산 절화의 품질보다 수입 산 절화의 품질이 우수하다고 응답하였다. 소비자의 구매 행 태 조사 결과, 주로 선물 목적으로 구매하며 구매 시 내적 품 질(수명)과 외적 품질(형태, 질감, 색상)을 중요시 여기는 것으 로 나타났다. 또한 소비자는 절화 구입 시 원산지를 확인하지 않는 경우가 많았으나 동일 품종일 경우 국내산을 구매한다고 응답하였다. 도·소매업자와 소비자의 절화 인식을 비교한 결 과, 도·소매업자는 국내산 절화가 평범하고 한정적이며, 수입 산 절화는 독특하다고 인식하였으나, 소비자는 국내산 절화가 독특하지만 수입산 절화와 국내산 절화 모두에 평범하고 한정 적이라고 인식하였다. 이러한 판매자와 소비자간 인식 차이는 실제 국가별 절화 품질에 대한 정량적 연구와 국가별 절화에 대한 인식 조사 필요성을 제기한다.

본 연구는 조현병으로 진단된 환자들과 정상 대조군 간의 자기공명영상을 사용하여 대뇌 피질 하부 영역의 부피를 측정 하여 대뇌의 구조적 이상을 비교하였다. 자기공명영상 검사 후 획득된 3D T1-MPRAGE 영상과 FreeSurfer 소프트웨어 를 사용하여 대뇌 피질 하의 31개 영역의 부피를 측정하였다. 연구 결과는 조현병 환자군에서 양측 측뇌실, 양측 맥락얼기, 제3뇌실, 뇌척수액 영역의 부피가 정상 대조군보다 유의하게 증가했으며, 좌 우반구 피질, 좌측 시상, 좌측 해마 영역의 부피는 정상 대조군보다 유의하게 감소하였다. 또한, 측정된 대뇌의 부피값과 PANSS 총점수는 약한 음의 상관관계를 나타 내었다. 따라서, 본 연구에서는 자기공명영상과 FreeSurfer를 이용하여 조현병 환자의 대뇌 피질 하 부피를 측정하고 이를 정상 대조군과 비교하여 유의한 증가와 감소를 확인하였다.

This study identified the core competencies of aircraft maintenance quality engineers and compared the importance and retention of core competencies. Through literature research, 21 core competencies were derived in three areas of management technology, elemenal technology and collaboration technology, and a survey was conducted on the importance and retention of core competencies for 42 aircraft maintenance quality engineers. As a result of the survey, the importance of all core competencies of aircraft maintenance quality engineers is 3.95/5 on average, and the retention of all core competencies is 3.99/5 on average. 'Risk Management’, ‘Creating Document’, ‘Honesty/Moral’ were identified as the most important competencies in each area, and ‘Quality Management’, ‘Language’, ‘Honesty/Moral’ were identified as the most possessed competencies in each area. An IPA (Importance-Performance Analysis) was performed to analyze the details. Through IPA, ‘Risk Management’ and ‘Safety Management’ were evaluated as having a low degree of retention compared to a high level of importance. Therefore, they were identified as a core competencies that need to be improved first. In addition, the characteristics of each core competency and the recognition level in the field were also identified. This study will be helpful in defining the roles and functions of aircraft maintenance quality engineers to improve flight quality and prevent aviation accidents.