• 한국과학교육학회지
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• 제13권3호
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• pp.334-340
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• 1993

A survey on the attitudes toward science and science courses was conducted with three hundred students of primary and secondary schools. The instrument used for measuring attitudes was TOSRA(Fraser, 1981). The subjects was sampled by stratified cluster sampling method. The major findings of this study are as follows. 1. The attitude scores has no significant differences among the students of large city, mid-sized city and rural areas. 2. The attitude scores of male and female students has ststistically significant difference. 3. Primary students has significantly higher attitude scores than secondary students. 4. In case of senior high schools, science-major students has significantly higher attitude scores than humanity-major students.

• 한국과학교육학회지
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• 제42권6호
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• pp.579-595
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• 2022

이 연구는 유튜브라는 공간에서 새롭게 교육활동을 하는 중등과학교사들에 대한 질적사례연구이다. 특히 이 연구는 생활세계 혹은 현실공간의 규범과 제약에서 벗어나, 다양한 이상향이 반영되어 사적 자유나 일탈을 가능케 해주는 공간을 의미하는 푸코의 '헤테로토피아'라는 개념을 중심으로 이 사례를 해석하고자 했다. 연구에는 최근 자발적으로 유튜브 플랫폼에 개인 채널을 개설하고, 과학 학습 관련 영상을 활발하게 올리는 현직 중등과학교사 5인이 참여했다. 5인의 중등과학교사들의 경험에 대한 이해를 위해 개별적으로 반구조적 심층면담을 통해 자료를 수집하였으며, 질적 사례 연구 기법을 활용하여 수집된 자료를 분석하였다. 연구의 타당한 해석을 위하여 참여자들이 제작한 영상 콘텐츠, 이들이 직접 제작한 교사연수자료 및 교수학습자료를 참조하였다. 연구 결과, '자신만의 고유한 교육활동에 대한 갈망', '확장된 교실 공간으로서의 유튜브', '교실의 장벽 너머로 확장된 관계망', '인정욕구의 충족과 유튜버로서의 정체성 경험', '전통적 교육공간과 유튜브 공간 사이의 긴장' '장인으로 거듭나기', '교사-유튜버로서 자신만의 방향 찾기'라는 크게 일곱 가지의 주제가 도출되었다. 이를 통해 기존의 중등학교와 교실 안에서 한정되던 중등과학교사의 정체성과 욕구가 유튜브라는 새로운 공간에서 확장되는 현상을 확인할 수 있었다. 또한 유튜브는 과학교사들이 자신들만의 이상을 실현하고 즐거움을 느껴 볼 수 있는 공간이며, 이 공간 내에서의 행동을 일상 공간 속의 규범과 잣대로만 규제하는 것은 오히려 이들의 건전한 정체성 형성과 성장을 가로막는 일이 될 수 있음을 제언하였다.

• 한국지구과학회지
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• 제30권6호
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• pp.773-786
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• 2009

최근 들어 과학관과 학교 교육과정의 연계가 강조되고 있으나 과학관이 학교 교육과정을 어느 정도 반영하고 있는지를 가늠할 수 있는 기준은 부족한 실정이다. 이에 본 연구의 목적은 과학관의 교육과정 반영의 정도를 객관적으로 판단할수 있는 기준을 개발하고 이를 이용하여 과학관 패널 전시 설명문을 평가하는데 있다. 이를 위해 중등학교 성취기준에 따른 평가 도구를 개발하였으며, 이를 이용하여 충청도지역의 세 과학관에서 지구과학 패널 전시 설명문의 교육과정 반영도와 교육과정 도달 수준을 측정하였다. 연구 결과 과학관 지구과학 패널 전시 설명문의 교육과정 반영도는 38.7%로 측정되었으며, 교육과정 도달 수준은 5.0 만점에서2.82로 평가되었다. 차후 과학관 전시물의 패널 전시 설명문의 수준을 결정하는 과정에서 교육과정의 성취기준에 대한 교육과정 반영도와 도달 수준의 평가 결과가 활용될수있기를 기대한다.

• 한국생물정보학회:학술대회논문집
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• 한국생물정보시스템생물학회 2003년도 제2차 연례학술대회 발표논문집
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• pp.133-138
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• 2003

The prediction of protein secondary structure has been an important bioinformatics tool that is an essential component of the template-based protein tertiary structure prediction process. It has been known that the predicted secondary structure information improves both the fold recognition performance and the alignment accuracy. In this paper, we describe several novel ideas that may improve the prediction accuracy. The main idea is motivated by an observation that the protein's structural information, especially when it is combined with the evolutionary information, significantly improves the accuracy of the predicted tertiary structure. From the non-redundant set of protein structures, we derive the 'potential' parameters for the protein secondary structure prediction that contains the structural information of proteins, by following the procedure similar to the way to derive the directional information table of GOR method. Those potential parameters are combined with the frequency matrices obtained by running PSI-BLAST to construct the feature vectors that are used to train the support vector machines (SVM) to build the secondary structure classifiers. Moreover, the problem of huge model file size, which is one of the known shortcomings of SVM, is partially overcome by reducing the size of training data by filtering out the redundancy not only at the protein level but also at the feature vector level. A preliminary result measured by the average three-state prediction accuracy is encouraging.

• Journal of Ginseng Research
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• 제36권4호
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• pp.442-448
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• 2012

Somatic embryogenesis is one of good examples of the basic research for plant embryo development as well as an important technique for plant biotechnology such as medicinally important plants. Single embryos develop into normal plantlets with shoots and roots. Therefore, direct single embryogenesis derived from single cells is highly important for normal plant regeneration. Here we demonstrate that the cyclic secondary somatic embryogenesis in Panax ginseng Meyer is a permanent source of embryogenic material that can be used for genetic manipulations. Secondary somatic embryos were originated directly from the primary somatic embryos on hormone-free Murashige and Skoog medium, and proliferated further in a cyclic manner. EM medium (one third of modified MS medium [MS medium containing half amount of NH4NO3 and KNO3] with 2% to 3% sucrose) favored further development of proliferated secondary somatic embryos into plantlets with root system. The plantlets developed into plants with well-developed taproots in half-strength Schenk and Hildebrandt basal medium supplemented with 0.5% activated charcoal.

• Journal of Ginseng Research
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• 제47권3호
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• pp.469-478
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• 2023

Background: Nitrogen (N) is an essential macronutrient for plant growth and development. To support agricultural production and enhance crop yield, two major N sources, nitrate and ammonium, are applied as fertilizers to the soil. Although many studies have been conducted on N uptake and signal transduction, the molecular genetic mechanisms of N-mediated physiological roles, such as the secondary growth of storage roots, remain largely unknown. Methods: One-year-old P. ginseng seedlings treated with KNO₃ were analyzed for the secondary growth of storage roots. The histological paraffin sections were subjected to bright and polarized light microscopic analysis. Genome-wide RNA-seq and network analysis were carried out to dissect the molecular mechanism of nitrate-mediated promotion of ginseng storage root thickening. Results: Here, we report the positive effects of nitrate on storage root secondary growth in Panax ginseng. Exogenous nitrate supply to ginseng seedlings significantly increased the root secondary growth. Histological analysis indicated that the enhancement of root secondary growth could be attributed to the increase in cambium stem cell activity and the subsequent differentiation of cambium-derived storage parenchymal cells. RNA-seq and gene set enrichment analysis (GSEA) revealed that the formation of a transcriptional network comprising auxin, brassinosteroid (BR)-, ethylene-, and jasmonic acid (JA)-related genes mainly contributed to the secondary growth of ginseng storage roots. In addition, increased proliferation of cambium stem cells by a N-rich source inhibited the accumulation of starch granules in storage parenchymal cells. Conclusion: Thus, through the integration of bioinformatic and histological tissue analyses, we demonstrate that nitrate assimilation and signaling pathways are integrated into key biological processes that promote the secondary growth of P. ginseng storage roots.

• Geomechanics and Engineering
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• 제7권3호
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• pp.279-295
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• 2014

A series of one-dimensional consolidation tests and triaxial creep tests were performed on Nansha clays, which are interactive marine and terrestrial deposits, to investigate their time-dependent behaviour. Based on experimental observations of oedometer tests, normally consolidated soils exhibit larger secondary compression than overconsolidated soils; the secondary consolidation coefficient ($C_{\alpha}$) generally gets the maximum value as load approaches the preconsolidation pressure. The postsurcharge secondary consolidation coefficient ($C_{\alpha}$') is significantly less than $C_{\alpha}$. The observed secondary compression behaviour is consistent with the $C_{\alpha}/C_c$ concept, regardless of surcharging. The $C_{\alpha}/C_c$ ratio is a constant that is applicable to the recompression and compression ranges. Compared with the stage-loading test, the single-loading oedometer test can evaluate the entire process of secondary compression; $C_{\alpha}$ varies significantly with time and is larger than the $C_{\alpha}$ obtained from the stage-loading test. Based on experimental observations of triaxial creep tests, the creep for the drained state differs from the creep for the undrained state. The behaviour can be predicted by a characteristic relationship among axial strain rate, deviator stress level and time.

• International Journal of Computer Science & Network Security
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• 제22권8호
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• pp.292-298
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• 2022

The study aimed to measure the effectiveness of using Cognitive virtual tours based on Marzano model to develop the achievement and some of historical research Skills for secondary school students. To achieve the objectives of the study, the experimental method was used and two study groups consisted of (60) students were divided into two groups, one is Control (30) students and the other is in experimental (30) students at Alsalam secondary in Ismailia Governorate. The study used several tools: The experimental processing tool of Cognitive Virtual tours based on Marzano model, Cognitive achievement test for the first unit of Secondary first grade history Course. Historical research skills. The finding of the study showed the effectiveness of using cognitive virtual tours based on Marzano model in developing the achievement and some of historical research skills for first grade secondary students which there are Statistically differences at level (0.01) between the average scores of the students in (experimental and Control) groups in post application for Cognitive achievement test. Practical application of the study can contribute to clarify how to use Cognitive virtual tours based on Marzano model in teaching history, and Draw the attention of history developers to the development of historical research skills.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2012년도 한국컴퓨터종합학술대회논문집 Vol.39 No.1(D)
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• pp.265-267
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• 2012

This paper analyzes network selection issues of secondary users (SUs) in Cooperative Cognitive Radio Networks (CRNs) by utilizing Queuing Model. Coordinating with Handover Cost-Based Network selection, this paper also addresses an opportunity for the secondary users (SUs) to enhance QoS as well as economics efficiency. In this paper, network selection of SUs is the optimal association between Overall System Time Minimization Problem evaluation of Secondary Connection (SC) and Handover Cost-Based Network selection. This will be illustrated by simulation results.

• 한국과학교육학회지
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• 제11권2호
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• pp.13-21
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• 1991

For development of teaching model for observational experiment and the major contents of science education guide books published for secondary school teacher in America, the actual survey to the secondary schools and the investigation of science education guide were carried out. The results were summarized as follows. 1. The major concepts of contents in science education books are constituted of introduction(9.67%), ability(8.94%), activity(6.61%), curriculum(11.61%), instruction planning(5.25%), instruction strategy(l7.74%), materials and facilities(1O.97%), evaluation(8.62%), society and community(l0.55%), guidelines(4.76%), practice(3.54%), and index(1.74%). 2. The constitution of multimedia teaching model for observational instruction was developed and arranged in order of six steps as observation, materialization, broad understanding, advanced study, application, and synthesis. This model was thought as the most effective for the achievement of the instructive goal for observational unit and others.