• 제목/요약/키워드: research activities

검색결과 16,907건 처리시간 0.046초

Comparison of Biological Activities of Korean Halophytes

  • Lee, Jeong Min;Yim, Mi-Jin;Lee, Dae-Sung;Lee, Myeong Seok;Park, Yun Gyeong;Jeon, Jae Hyuk;Choi, Grace
    • Natural Product Sciences
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    • 제24권4호
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    • pp.247-252
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    • 2018
  • Halophytes are expected to possess abundant secondary metabolites and various biological activities because of habitat in extreme environments. In this study, we collected 14 halophytes (Asparagus oligoclonos, Calystegia soldanella, Carex pumila, Chenopodium glaucum, Elymus mollis, Glehnia littoralis, Limonium tetragonum, Messerschmidia sibirica, Rosa rugosa, Salsola komarovii, Spergularia marina, Suaeda glauca, Suaeda maritima, and Vitex rotundifolia) native to Korea and compared their total polyphenol contents, antioxidant and anti-inflammatory activities. The total polyphenol contents of R. rugosa (27.28%) and L. tetragonum (13.17%) were significantly higher than those of the other 12 halophytes and L. tetragonum, R. rugosa, and M. sibirica showed significantly greater antioxidant activities than the other 11 halophytes, as determined by DPPH (2,2-diphenyl-1-picrylhydrazyl). A. oligoclonos, E. mollis, and C. pumila showed significantly greater anti-inflammatory activities than the other 11, as determined by NO (Nitric oxide) and $PGE_2$ (Prostaglandin $E_2$) levels. In contrast, these three extracts had normal and low total polyphenol contents among the 14 halophytes. Consequently, the total polyphenol content in the 14 studied halophytes appeared to be related to antioxidant, but not anti-inflammatory activity levels.

Biological Evaluation of Korean Medicinal Plants (III)

  • Woo, Won-Sick;Lee, Eun-Bang;Han, Byung-Hoon
    • Archives of Pharmacal Research
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    • 제2권2호
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    • pp.127-131
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    • 1979
  • The extracts of sixty Korean plants were evaluated for their biological activities such as antitumor activities against Sarcoma 180, Leukemia SN-36 and Ehrlich ascites carcinoma, antimicrobial activities and behavioral observation in mice. The results are tabulate.

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공학교육인증활동을 교수업적평가에 반영하는 방안 (A Study on Including the ABEEK Activities in the Professor Evaluation System)

  • 박진원;백현덕
    • 공학교육연구
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    • 제12권4호
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    • pp.93-101
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    • 2009
  • 국내 많은 공학계 대학에서 공학교육인증제가 시행되고 있다. 대부분의 대학이 교육, 연구, 봉사로 나누어 교수업적평가를 시행하고 있고, 승진과 관련하여 전문학술지에 게재한 연구논문 실적이 가장 중요한 평가지표가 되고 있다. 그러나 공학교육인증 관련 활동이 교수업적평가에 반영되지 않고 있어 평가기준과 교육관련 의무 사이에 괴리가 존재한다. 본 논문은 공학교육인증 관련 활동을 교수업적평가에 포함시키는 방안을 모색해 본 것이다. 제시된 5가지 방안 중에서 설문조사결과 정년을 보장받은 정교수급은 책임시수 경감을 선호했고 부 조교수급은 논문게재 실적 경감을 선호하였다. 논리성과 교수들의 선호도를 감안해 보면 공학교육인증제 시행에 참여하는 교수들에게 책임강의 시수 일부를 경감해 주거나 추가 강의실적으로 인정해 주는 등 교육관련 업적으로 평가하는 것이 타당해 보인다. 그러나 오랫동안 공학교육인증제를 시행해 오고 있는 미국의 경우 공학계 교수들에게 특별한 혜택이 부여되지 않고 있는 점을 감안해 보면, 우리나라도 도입과 정착기를 지나면 공학교육인증제 시행에 따른 혜택을 점차 폐지해 나가야 할 것으로 판단된다.

중소기업경영자의 긍정적 리더십, 구성원의 긍정적 삶의 태도, 학습조직활동, 직무열의, 조직성과 변인간의 구조적 관계 (Structural Relationships among SEM CEO's Positive Leadership, Members' Positive Life Positions, Learning Organization Activities, Job Engagement, and Organizational Performance)

  • 박수용;최은수
    • 유통과학연구
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    • 제13권12호
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    • pp.113-131
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    • 2015
  • Purpose - In today's era of globalization, the competitive power of enterprises is growing fiercer, calling for organizations to be able to respond flexibly to survive and maintain predominance in competition. In turn, keen competition exists among enterprises for the systematic management of members' knowledge to secure predominance in such competition. Under such circumstances, SMEs must find and utilize positive causes for change that affect organizational performance. The objective of this study is to analyze the structural relationship between four factors known from prior research-a CEO's positive leadership, members' positive life positions, learning organization activities, and job engagement-and organizational performance. Research design, data, and methodology - To achieve this objective, this study established the following four research problems. First, do CEOs' positive leadership, members' positive life positions, learning organization activities, and job engagement affect organizational performance? Second, do CEOs' positive leadership, members' positive life positions, and learning organization activities affect job engagement? Third, do CEOs' positive leadership and members' positive life positions affect learning organization activities? Fourth, does CEOs' positive leadership affect members' positive life positions. Additionally, to achieve the objective of this study, the research model was selected on the basis of a documentary survey of 787 full-time employees at 100 SMEs, which was used to collect related data. Results - The following conclusions were drawn. First, a CEO's positive leadership directly affects members' positive life positions, learning organization activities, and job engagement. Second, positive leadership only indirectly affects organizational performance. That is, positive leadership has an indirect effect on organizational performance given the parameters of members' positive life positions, learning organization activities, and job engagement. Third, members' positive life positions directly affect learning organization activities and job engagement, but indirectly affect organizational performance with learning organization activities and job engagement as parameters. Fourth, learning organization activities directly affect job engagement and organizational performance. Additionally, learning organization activities indirectly affect organizational performance with job engagement as a parameter. Fifth, job engagement directly affects organizational performance. Conclusions - A CEO's positive leadership and members' positive life positions do not directly affect organizational performance but have a positive effect through learning organization activities and job engagement. In particular, CEOs' positive leadership was proven to be the major factor to affect members' positive life positions, learning organization attitudes, and job engagement, and learning organization activities and job engagement were found to be major factors that directly affect organizational performance. Considering these conclusions, the direct effect of a CEO's positive leadership on organizational performance is not statistically significant but seems to affect members' positive life positions, learning organization activities, and job engagement, which ultimately affects organizational performance. In addition, CEOs' positive leadership is an important factor that enhances the factors with the strongest effect on organizational performance-activities of learning organizations and job engagement.

Anticoagulant activities of curcumin and its derivative

  • Kim, Dong-Chan;Ku, Sae-Kwang;Bae, Jong-Sup
    • BMB Reports
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    • 제45권4호
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    • pp.221-226
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    • 2012
  • Curcumin, a polyphenol responsible for the yellow color of the curry spice turmeric, possesses antiinflammatory, antiproliferative and antiangiogenic activities. However, anticoagulant activities of curcumin have not been studied. Here, the anticoagulant properties of curcumin and its derivative (bisdemethoxycurcumin, BDMC) were determined by monitoring activated partial thromboplastin time (aPTT), prothrombin time (PT) as well as cell-based thrombin and activated factor X (FXa) generation activities. Data showed that curcumin and BDMC prolonged aPTT and PT significantly and inhibited thrombin and FXa activities. They inhibited the generation of thrombin or FXa. In accordance with these anticoagulant activities, curcumin and BDMC showed anticoagulant effect in vivo. Surprisingly, these anticoagulant effects of curcumin were better than those of BDMC indicating that methoxy group in curcumin positively regulated anticoagulant function of curcumin. Therefore, these results suggest that curcumin and BDMC possess antithrombotic activities and daily consumption of the curry spice turmeric might help maintain anticoagulant status.

Learning Activities and Learning Behaviors for Learning Analytics in e-Learning Environments

  • Jin, Sung-Hee;SUNG, Eunmo;Kim, Younyoung
    • Educational Technology International
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    • 제17권2호
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    • pp.175-202
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    • 2016
  • Most of the learning analytics research has investigated how quantitative data can affect learning. The information that is provided to learners has been determined by teachers and researchers based on reviews of the previous literature. However, there have been few studies on standard learning activities that are performed in e-learning environments independent of the teaching methods or on learning behavior data that are obtained through learning analytics. This study aims to explore the general learning activities and learning behaviors that can be used in the analysis of learning data. Learning activities and learning behavior are defined in conjunction with the concept of learning analytics to identify the differences between teachers' and learners' learning activities. Learning activities and learning behavior were verified by an expert panel review in an e-learning environment. The differences between instructors and learners in their usage were analyzed using a survey method. As results, 8 learning activities and 29 learning behaviors were validated. The Research has shown that instructors' degree of utilization is higher than that of the learners.

창의적 체험활동 프로그램이 과학개념 및 자기주도적 학습능력에 미치는 효과 (The Effects of Science Lessons Using Creative Activities on Scientific Concepts and Self Directed Learning Ability)

  • 이용섭;김윤경
    • 대한지구과학교육학회지
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    • 제8권3호
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    • pp.399-408
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    • 2015
  • This study is to find out that the effects of a creative experience activity program to scientific concepts and self-directed learning skills. This study has been aimed at 2 class 40 students of 4th grade in D metropolitan city A elementary school in 2015, one class 20 students are the research group to apply Scientific research program using creative experience activity, another class 20 students were comparison groups to apply general science classes. The related class section of this study is 4th grade 2 semester of science 4 chapters, 'The Earth and the moon' This section is in fourth grade elementary science curriculum revision in 2009 is a Sections to learn for the first time about astronomical area. Target research group in club activities as part of the creative activities implemented using scientific inquiry and analyzed the results. In addition, in order to better research based on the results of this study as follows. First, the science curriculum in elementary schools, as well as applied research about the creative experience activity classes in other subjects is required. The ongoing research is needed to classes utilizing the characteristics of creative experience activities in several subjects of the elementary school curriculum. Second, Creative experiential learning is only effective when it is done consistently, it is worth studying for long periods of time.

품질코스트를 이용한 데이터 QC 활동의 자원할당 모형 연구 (A Resource Allocation Model for Data QC Activities Using Cost of Quality)

  • 이상철;신완선
    • 산업공학
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    • 제24권2호
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    • pp.128-138
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    • 2011
  • This research proposes a resource allocation model of Data QC (Quality Control) activities using COQ (Cost of Quality). The model has been developed based on a series of research efforts such as COQ classifications, weight determination of Data QC activities, and an aggregation approach between COQ and Data QC activities. In the first stage of this research, COQ was divided into the four typical classifications (prevention costs, appraisal costs, internal failure costs and external failure costs) through the opinions from five professionals in Data QC. In the second stage, the weights of Data QC activities were elicited from the field professionals. An aggregation model between COQ and Data QC activities has been then proposed to help the practitioners make a resource allocation strategy. DEA (Data Envelopment Analysis) was utilized for locating efficient decision points. The proposed resource allocation model has been validated using the case of Korea national defense information system. This research is unique in that it applies the concept of COQ to the data management for the first time and that it demonstrates a possible contribution to a real world case for budget allocation of national defense information.

감국의 Monoamine Oxidase 저해활성 (Inhibitory Activity on Monoamine Oxidase of Chrysanthemum indicum L.)

  • 장은주;최동국;박태규;황금희
    • 생약학회지
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    • 제38권1호
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    • pp.27-30
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    • 2007
  • We examined the inhibitory activities against monoamine oxidase (MAO) of Chrysanthemum indicum L. in vitro and in vivo methods. Methanolic extract of C. indicum showed significant inhibitory activities on MAO-A that were prepared from rat brain in vitro. The inhibitory activities were measured by serotonin as a substrate. The $IC_{50}$ value of methanolic extract of C. indicum was 0.24 mg/ml for the inhibition of MAO-A. The ethylacetate fraction of methanolic extract of C. indicum exhibited the best activity toward MAO-A with $IC_{50}$ value of 0.05 mg/ml in vitro. It was observed that those activities in vivo tests have different tendency each other. Ethanolic extract of C. indicum was have no effect on rat MAO by the oral administration (p<0.05). However, MAO inhibitory activities of ethanolic extract of C. indicum by the oral administration have similar tendency to those of iproniazid. Consequently, we suggest that C. indicum may have the effects on the inhibitory activities against MAO both in vitro and in vivo. These results indicates that the C. indicum extract has properties indicative of potential neuroprotective ability.

Anticoagulant activities of oleanolic acid via inhibition of tissue factor expressions

  • Lee, Won-Hwa;Yang, Eun-Ju;Ku, Sae-Kwang;Song, Kyung-Sik;Bae, Jong-Sup
    • BMB Reports
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    • 제45권7호
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    • pp.390-395
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    • 2012
  • Oleanolic acid (OA), a triterpenoid known for its anti-inflammatory and anti-cancer properties, is commonly present in several medicinal plants but its anticoagulant activities have not been studied. Here, the anticoagulant properties of OA were determined by monitoring activated partial thromboplastin time (aPTT), prothrombin time (PT), fibrin polymerization as well as cell-based thrombin and activated factor X (FXa) generation activities. Data showed OA prolonged aPTT and PT significantly and inhibited thrombin catalyzed fibrin polymerization. In addition, OA inhibited the activities of thrombin and FXa and inhibited the generation of thrombin or FXa in human endothelial cells. OA also inhibited TNF-${\alpha}$-induced tissue factor expression on human endothelial cells. In accordance with these anticoagulant activities, OA showed an anticoagulant effect in vivo. These results indicate that OA possesses antithrombotic activities and suggest that daily consumption of a herb containing OA may be preventing thrombosis in pathological states.