• Title, Summary, Keyword: Scientific Experiment

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The Effects of Scientific Experimental Classes Emphasized Small Group Argument Activities on Science Achievement and Scientific Attitudes (소집단 논의활동을 강조한 과학실험수업이 과학성취도 및 과학적 태도에 미치는 효과)

  • Kim, Soon-Shik
    • Journal of the Korean Society of Earth Science Education
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    • v.5 no.1
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    • pp.95-104
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    • 2012
  • The purpose of this study is to examine what effects the experiment class to stress discussion of small groups in scientific experiment class of the elementary school has on scientific achievement and attitude on the science of the students comparing to the usual scientific experiment class. For that purpose, this study has divided 49 students at the 6th grade of the M elementary school in P City into test groups of 24 students and control groups of 25 students. Classes have been progressed by giving sufficient time to the test groups for discussion by each small groups after experiment while by allowing the control groups to finish the experiment with arrangement of the experiment results. Conclusions of this study include: First, the more familiar the experiment materials are and the easier the experiment procedures are to be operated by the students, the more actively the small group discussion activities have been deployed. It shows that the students need a certain level of background knowledge before experiment for vital discussing activities. Second, it is appeared that the test groups given the scientific experiment class stressing small group discussing activity have significantly high scores comparing to the control groups given the existing scientific experiment class. It shows that the small group discussing activities have effects on promoting understanding of the students on the scientific achievement for the scientific experiment class. Third, it is appeared that the test groups given the scientific experiment class stressing small group discussing activity significantly high scores on attitude about the science comparing to the control groups given the existing scientific experiment class. It is considered that the students could have opportunities to compare their own thoughts with others and to have reflective thought to change their thoughts through the small group discussing activity. As shown above, it shows that the experiment class to stress discussing activities is more effective to increase scientific achievement and attitude about the science than the scientific experiment class to get and arrange the experiment results from the existing experiment classes.

Assay of In Vivo Chromium with a Hollow-fiber Dialysis Sensor

  • Ly, Suw-Young;Yoo, Hai-Soo;Jung, Min-Ki;Ko, Kwang-Hee;Kim, Byung-Jin;Lee, Ki-Chul;Choi, Byung-Min
    • Toxicological Research
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    • v.26 no.3
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    • pp.233-236
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    • 2010
  • The analytical in vivo chromium ion was searched for using a voltammetric hollow-fiber dialysis sensor via square wave stripping voltammetry (SW), cyclic voltammetry (CV), and chronoamperometry. Under optimum parameters, the analytical results indicated linear working ranges of 50~400 mg/l CV and $10{\sim}80\;{\mu}g/l$ SW within a 30-sec accumulation time. The analytical detection limit (S/N) was $6.0\;{\mu}g/l$. The developed method can be applied to in vivo tissues and in ex vivo toxicity assay, as well as to other materials that require chromium analysis.

Analysis of Lead Ions in a Waste Solution Using Infrared Photo-Diode Electrode

  • Ly, Suw-Young;Lee, Hyun-Kuy;Kwak, Kyu-Ju;Ko, Jun-Seok;Lee, Jeong-Jae;Cho, Jin-Hee;Kim, Ki-Hong;Kim, Min-Seok;Lee, So-Jung
    • Toxicological Research
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    • v.24 no.3
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    • pp.227-233
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    • 2008
  • To detect lead ions using electrochemical voltammetric analysis, Infrared Photo-Diode Electrode(IPDE) was applied via cyclic and square wave stripping voltammetry. Lead ions were deposited at 0.5 V(versus Ag/AgCl) accumulation potential. Instrumental measurements systems were made based on a simple and compact detection system. The stripping voltammetric and cyclic voltammetric optimal parameters were searched. The results yielded a cyclic range of $40{\sim}240mgl^{-1}$ Pb(II) and a square wave stripping working range of $0.5{\sim}5.00mgl^{-1}$ Pb(II). The relative standard deviation at 2 and 4 $mgl^{-1}$ Pb(II) was 0.04% and 0.02%(n=15), respectively, using the stripping voltammetric conditions. The detection limit was found to be 0.05 $mgl^{-1}$ with a 40 sec preconcentration time. Analytical interference ions were also evaluated. The proposed method was applied to determine lead ions in various samples.

The Impact of the Project Approach Utilizing Beans As the Subject Matter on Young Children's Scientific Research Capabilities and Scientific Attitudes (콩을 주제로 한 프로젝트 접근법이 유아의 과학적 탐구 능력과 과학적 태도에 미치는 영향)

  • Cho, Mi-Jeong;Ahn, Chin-Kyeong
    • Korean Journal of Human Ecology
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    • v.18 no.3
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    • pp.631-639
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    • 2009
  • This study examines how the project approach utilizing beans as the subject matter influences young children's scientific research capabilities and scientific attitudes. This examination ultimately aims at developing effective teaching methods and programs that can promote children's scientific research capabilities and scientific attitudes. Thirty six children at H kindergarten in Gunsan, Jeollabuk-do were selected as subjects of this study. The children aged five were divided into an experiment group and a comparison group, with eighteen for each group. Before the experiment, a pre-test was conducted on the children's scientific research capabilities and scientific attitudes. The pre-test results were subject to a t test to identify whether there were differences between the two groups in age as well as the levels of scientific research capabilities and attitudes. A post-test was also conducted to determine the differences between the two groups in these categories. These results have led to the conclusion that the project approach utilizing beans as the subject matter has a positive impact on improving young children's scientific research capabilities and scientific attitudes.

Voltammetric measurements of iron using an infrared photodiode electrode (적외선 광 다이오드를 사용한 철의 전압전류 정량)

  • Ly, Suw Young;June, Young Sam;Lee, Hyun Ku;Kwak, Kyu Ju;Kim, Kun Woo;Kim, Jong Hyoung;Jeong, Ho Young;Kim, Bong Kyun;Chun, Seok Joo;Chang, Jin Won
    • Analytical Science and Technology
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    • v.20 no.4
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    • pp.289-295
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    • 2007
  • A simple electric circuit of an infrared photodiode electrode (IPDE) was utilized to monitor iron using square-wave (SW) anodic stripping voltammetry (SV) and cyclic voltammetry (CV). The optimum analytical conditions were determined and were compared with those of common working electrodes. The comparison showed that CV is more sensitive and convenient to use than the common voltammetry methods. At the optimized conditions, the working ranges of 0.1- to 0.8- and 0.85- to 6.0 mg/L iron was obtained. Relative standard deviation of 15 measurements of iron (0.4 mg/L) was 0.09%. The analytical detection limit was found to be $80{\pm}0.6ug/L$, which was applied to iron in waste water.

Ex Vivo Assay of Trace Nicotine Using a Voltammetric Modified Biosensor

  • Ly, Suw Young;Jang, Myung-Ho;Cha, Jae-Min;Kim, Min-Young;Oh, Hyun-Seok;Jo, Dong-Hyeon;Choi, Seong-Sik
    • Journal of the Korean Applied Science and Technology
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    • v.29 no.1
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    • pp.40-46
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    • 2012
  • In vivo nicotine is associated with Alzheimer's, Parkinson's and lung cancer. Diagnostic assays of these diseases depend on very low analytical detection limits. In this study, a sensitive analytical method was examined using a voltammetric graphite pencil electrode (GPE) and a modified carbon nanotube paste electrode (CNE). The optimum analytical conditions for both electrodes were compared using square wave anodic stripping voltammetry (SW) and cyclic voltammetry (CV) obtaining 400 sec accumulation time and oxidation peak. Under optimum parameters, the stripping working range of GPE was $5.0-40.0{\mu}g/L$, CNE: 0.1-0.8 and $5-50{\mu}g/L$. Quantification limits were $5.0{\mu}g/L$ for GPE and $0.1{\mu}g/L$ for CNE, while detection limits were $0.6{\mu}g/L$ for GPE and $0.07{\mu}g/L$ for CNE. A standard deviation of $10.0{\mu}g/L$ was observed for 0.064 GPE and 0.095 CNE (n = 12) using 400 sec accumulation time. The results obtained can be applied to non.treated urine and ex vivo biological diagnostics.

Investigation of Scientific Argumentation in the Classes for Elementary Gifted Students (초등 단위 학교 영재 수업에서 나타나는 과학적 논증 과정에 대한 탐색)

  • Lim, Hyeon-Ju;Shin, Young-Joon
    • Journal of Korean Elementary Science Education
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    • v.31 no.4
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    • pp.513-531
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    • 2012
  • This study was to analyze the characteristic of scientific argumentation in the classes for the gifted of elementary school. The participants of this study were 5 fifth graders and 9 sixth graders, 14 in total, from the basic unit schools for gifted students of J elementary school in Incheon city. And it constituted small scale groups made up of 2~3 students with similar or identical ability in scientific reasoning. It had set up hypothesis for each group before the experiment, and students had a group discussion as a whole after the experiment. Classes were conducted 4 times, all courses were recorded as a sound/video. The ability in scientific reasoning of the students was inspected, making use of SRT II by means of pre-survey, and their argumentation levels were analyzed, utilizing 'Rubric for scientific argumentation course assessment.' As a result, argumentations did not incurred in every class. Analysis in argumentations of the students resulted in low level argumentation. This means argumentation cannot incur based on that with the limit in understanding the principle of experiments over the threshold of textbook no matter that he is an gifted student or not. The student both in formal operational period and transition period (2B/3A), the ability of scientific thinking in upper level, was improved of his argumentative ability in an overall aspect. However, a student of concrete operational period, the ability of scientific thinking in lower level, had argumentation with still lower level even after the experiment at the moment of discussing with the students on the upper level of scientific thinking ability.

A Study on the Development of Scientific Experimental Model for the Home Economics Textiles Class in High School (고등학교 가정과 피복재료 탐구실험학습 모형 개발)

  • 라상숙;이전숙;김용숙
    • Journal of Korean Home Economics Education Association
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    • v.10 no.1
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    • pp.153-169
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    • 1998
  • The purposes or this study were to develop the scientific experimental model, experimental guidelines for teachers, experiment planning & report form for students, and evaluation scales for the Home Economics Textiles class in high school. First, through review of literature concerned, scientific experimental model was defined, and the usefulness of this model on the teaching situation testified on other subjects such as Physics and Bilolgy, was reviewed. Secondly, scientific experimental model, experimental guidelines for teachers, experiment planning & report form for students, and evaluation scale were developer on the bases on APU evaluation model, experimental guidelines for teachers, experiment planning & report form for students, evaluation scale applicable to the teaching situation ere established by analysing the significant differences scientifically.

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Biological Assay of Mercury and Cadmium Ions Using DNA Immobilized on a Nanotube Paste Electrodes

  • Ly, Suw-Young;Lee, Chang-Hyun;Jung, Hong-Rak;Park, Kwang-Ho;Park, Yong-Keun;Suk, Hong-Woo
    • Journal of the Korean Applied Science and Technology
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    • v.29 no.2
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    • pp.302-310
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    • 2012
  • Bio assay of mercury and cadmium ions were searched using voltammetric analysis using DNA doped carbon nanotube paste electrodes (DCP). The square-wave stripping voltammetryic optimized results indicated working ranges of 1-10.0 $ngL^{-1}$ and 20-100 $ugL^{-1}$, Hg(II) Cd(II) within an accumulation time of 120 seconds, in 0.1-M phosphate buffer solutions of pH 6.3. The relative standard deviations of 5 $ngL^{-1}$ Hg(II) and Cd(II) that observed were 0.14 and 0.22% (n=12), respectively, using optimum conditions. The low detection limit (S/N) was pegged at 0.1 $ngL^{-1}$ ($4.9{\times}10^{-11}M$) Hg(II) and 0.2 $ngL^{-1}$ ($1.77{\times}10^{-10}M$) Cd(II). The developed methods can be applied to assays in biological fish kidneys and water samples.