http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 구교훈 (검색결과 34 건)
-
Storytelling의 장기 노출에 의한 듣기능력의 향상 방안
구교훈 경상대학교 교육대학원 2007 국내석사
In the seventh Education Curriculum, the aim of English education is the continual improvement of listening and speaking capability of learners. However, the continued improvement of listening and speaking skills is still greatly influenced by a lack of sufficient time exposure. This research was conducted based on the hypothesis that through the long term exposure to stories about culture made up of specific language. You can improve development of understanding language materials significantly. You can also satisfy Krashen's(1985) silent period to a certain extent? This research verifies the improving effect of long term exposure to storytelling before sleep on listening and speaking capability. For the purpose of this research the second grade high school classes were used as test subjects. The research period was from February 2006 until late October 2006. The following research methodology steps were followed. Firstly; The researcher selected a story with words(target language) that was already known by the test subjects learners. Secondly; Throughout the space of time before sleeping during storytelling time, no limits were placed on when the story should be ended. Thirdly, Based on the 5W1H(when, where, who, why, what, how) principles, all notes were written in the learner's Notes as soon as the learner's remembered something relevant. Lastly, They were reasoned with the help of the teacher's advice and unfolded the story plot. To guarantee the consistency and transparency of this research, a questionnaire was given to the test subjects before the start of the research and also another questionnaire after the research was concluded. In conclusion, the improvement of listening competence based on long term exposure to storytelling before sleep made significant improvements in learners' listening and speaking ability. It is important to note that continual storytelling exposure must be continued in order to amplify all the positive research results. Learners' interest in practicing English also grew positively. This research could be used fruitfully in the future serving as a basis for the continual improvement of listening and speaking capability of learners.
-
-
Microbolometer Fabrication using NiO Thin Films A thesis submitted to the Council of the Graduate School of Kyungpook National University in partial fulfillment of the requirements for the degree of Master of Science in June, 2013. Gyo-Hun Koo Graduate School of Electronics Engineering, College of IT Engineering, Kyungpook National University Daegu, Korea (Supervised by Professor Sung-Ho Hahm) (Abstract) Nickel oxide (NiO) film was formed on the SiO2/Si substrate at the room temperature with water cooling system by reactive RF sputter. The feasibility of bolometric material was investigated, and a microbolometer using the NiO films were fabricated and evaluated. The NiO films were analyzed by using grazing-incidence X-ray diffraction. The NiO(111), NiO (200), and NiO (220) peaks expected as the main spectrum were dominantly appeared on the polycrystalline NiO films. The resistivity of NiO films acquired at the O2/(Ar+O2)ratio of 10 ~ 90 % have been measured about 40.6 ~ 18.65 Ωcm. The resistivity of NiO films according to different RF power 100 ~ 400 W have been measured 34.25 Ωcm ~ 13.97 Ωcm. The resistivity of NiO films according to different working pressure 5 ~ 20 mTorr have been measured 19.56 ~ 28.33 Ωcm. The resistivity of obtained in low oxygen partial pressure was inclined to reduce according to the increase of the O2/(Ar+O2)ratio. Microbolometer(100×100μm2 pixel) fabricated based on deposited NiO thin films by using reactive RF sputter. TCR value calculated of fabricated microbolometer was -1.67 %/℃ at the resistivity value of 40.6 Ωcm and was value of -1.01 %/℃ at resistivity value of 18.65 Ωcm. The TCR values calculated so far are an average value for the temperature range 5 ~ 60 ℃. The characteristics of fabricated NiO film and microbolometer were demonstrated by XRD patterns, TCR value, and SEM image.
-
Study on the Reaction Kinetics and Mechanism of Urea Oxidation Using Bromine
The halogenation mechanism of urea was investigated through a combination of experimental and theoretical approaches, with focus on understanding pH-dependent reaction pathways. The study revealed distinct reaction behaviors under acidic, neutral, and basic conditions through systematic analysis of total residual oxidant (TRO) consumption and UV-Visible spectroscopic monitoring. Under neutral conditions, unexpected TRO preservation was observed, alongside characteristic spectral evolution patterns suggesting the presence of distinct intermediates. Integration of experimental data with density functional theory calculations provided evidence for brominated intermediates undergoing isomeric transformation, offering a new perspective on the traditional sequential halogenation model. The pH-dependent reaction kinetics and spectral changes were rationalized through a mechanism incorporating intermediate isomerization as a key step. This mechanism provides a comprehensive framework for understanding urea halogenation processes, with implications for related carbamide derivative chemistry. 본 연구는 실험적, 이론적 접근을 통해 우레아의 할로겐화 반응 메커니즘을 규명하였다. 총잔류산화제(TRO) 소비 패턴과 자외선-가시광선 분광학적 모니터링을 통한 체계적 분석을 수행하였으며, 이를 통해 산성, 중성, 염기성 조건에서의 서로 다른 반응 거동을 관찰하였다. 특히 중성 조건에서는 예상치 못한 TRO 보존이 관찰되었으며, 이는 특징적인 스펙트럼 변화 패턴과 함께 독특한 중간체의 존재를 시사하였다. 실험 데이터와 밀도범함수이론 계산을 통합적으로 분석한 결과, 브롬화 중간체들이 형성되고 이성질화 과정을 거치는 것으로 확인되었으며, 이는 기존의 순차적 할로겐화 모델에 새로운 관점을 제시하였다. pH 의존성 반응 속도론과 스펙트럼 변화 패턴은 중간체 이성질화를 핵심 단계로 포함하는 메커니즘을 통해 일관되게 설명될 수 있었다. 특히 브롬화 우레아 중간체의 이성질화 현상은 브롬 농도와 독립적인 1차 반응으로 진행되는 것으로 나타났다. 본 연구에서 제시된 메커니즘은 우레아 할로겐화 과정의 포괄적 이해를 제공할 뿐만 아니라, 관련 카바마이드 유도체의 반응 메커니즘, 반응속도론, pH 의존성 거동을 해석하는 데 있어 새로운 이론적 틀을 제공한다. 이러한 발견은 할로겐화 반응의 메커니즘적 이해를 크게 향상시키며, 향후 관련 연구 분야의 발전에 중요한 기여를 할 것으로 기대된다.
-
-
In this study, Ag2O decorated hierarchical TiO2 was synthesized by employing a facile hydrothermal method, which involved the usage of an amphiphilic double comb copolymer templated sol-gel and a chemical bath deposition. An amphiphilic double comb copolymer was synthesized based on the atom transfer radical polymerization reaction. The electrochemically active area, which significantly affects photoelectrochemical cell performance, was significantly increased by performing the sol-gel process based on the use of polymer templates. The synthesized Ag2O@HNR photoanode demonstrated a photocurrent density of 1.78 mA cm-2 at 1.23 V against RHE under 1 sun illumination. This observed value of photocurrent density exceeded that of TiO2 nanorods by 2.18 times. 본 연구에서, 산화은이 증착된 계층적 구조의 이산화티타늄을 수열합성, 화학용액증착법, 그리고 양친매성 고분자를 이용한 솔-겔법을 이용하여 합성하였다. 양친매성 고분자는 원자이동라디칼중합법에 의해서 중합되었다. 위 방법으로 제작된 광전극은 광전기화학셀에서 큰 영향을 미치는 전기화학적 활성면적이 크게 증가되었으며, 복사 조도 100 mWcm-2 및 표준수소전극 대비 1.23 V에서 전류밀도 1.78 mA cm-2으로 기존의 이산화티타늄 나노로드에 비해 2.18배 증가한 성능을 나타냈다.
-
DNA 마이크로어레이 유전자 발현정보의 생물학적 군집분석방법에 관한 연구
The recent advance in microarray technology enabled us to monitor hundreds of thousands of genes simultaneously, leading to the exponential growth of gene expression profile data. Currently many attentions are paid to the development of computational algorithms for handling large gene expression profiles generated through microarray experiments. Especially, cluster analysis of gene expression profiles are frequently performed to characterize biological functions of unknown genes while other many attempts are recently being made to unveil the gene relationship between genes. In this study, our objective is to estimate the biologically meaningful number of clusters by employing such a prior knowledge as GO-Slim, MIPS FunCat etc. and to perform a comparative study of clustering results obtained by several popular clustering algorithms with the estimated number of clusters. For cluster generation, extensive algorithms were employed which include K-means, SOM, hierarchical clustering, model-based method, QT-Clust, and CAST. For experiments, two benchmark datasets, which are Cho’s yeast cell cycle data and Eisen’s combined yeast data, are used and their performances are evaluated in statistical and biological aspects. As a result, we could find better estimation of K* by using GO-Slim, rather than MIPS FunCat. In case of Gene Ontology, too many attributes made difficulties in generating gene function vectors for the estimation of cluster boundary, so it was not included here. Overall, from our experiments, it is observed that the gene clusters obtained by employing gene annotation databases, as well as gene expression profiles, could reflect the real underlying characteristics of the experimental datasets reasonably well.
-
-
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
