• Journal of the Korean Chemical Society
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• v.50 no.5
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• pp.374-384
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• 2006

this study, the teaching methods of three science teachers for lead-iodide precipitation reaction experiment were compared. The difference of 9th grade students' understanding was searched according to the science teachers teaching styles, also. Among the three teachers, Teacher A taught students based on the science textbook and allowed students to think themselves and to get out conclusion by the experiment. Teacher B and Teacher C gave students a lot of explanations related to interpretation of the experiment. The percentage of no response on the experiment report of Teacher A was higher than those of Teacher B and Teacher C. But the students of Teacher B and Teacher C tended to have limited thoughts because of the teachers explanations. In spite of the difference, it was common phenomenon that few students understood concepts through the experiment. A lot of students were interested in the experiment, but it was hard to understand Law of definite proportions according to the experiment.

• Journal of Pharmacopuncture
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• v.7 no.2
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• pp.43-56
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• 2004

Objectives : In order to investigate effects and immune improvement of distilled red-ginseng herbal Acupuncture, expression of Cox-1, Cox-2, and mRNA of Bcl-2 and Bax were analyzed in A549 cell in vivo. Survival time and expression of cytokine mRNA were measured for the mice with Sarcoma-180 induced abdominal cancer. Methods : Balb/c mouse was treated with distilled red-ginseng Herbal Acupuncture at Wisu($BL_{21}$) and Chung- wan($CV_{12}$) to investigate anti-cancer effects and immune response. Results : 1. For expression of mRNA of Cox-1 using RT-PCR, the control group and the experiment groups didn't show significant differences. For Cox-2, both experiment groups and the normal group showed significant differences. 2. For expression of mRNA of Bcl-2 using RT-PCR, experiment groups showed slight decrease compared to the control group. For Bax, no significant changes were shown between the control group and experiment groups. 3. For survival time, all of experiment groups showed 11.1% increase compared to the control group. 4. For IL-2 and IL-4 productivity using Flow cytometry, all of experiment groups didn't show any significance. 5. For IL-2 productivity using ELISA, all of experiment groups didn't show any significance. 6. For expression of cytokine mRNA using RT-PCR, significant increase of IL.-2 and IL-4 were witnessed in the experiment group II compared to the control group. Significant increase of IL-10 was shown in all off experiment groups compared to the control group. Conclusion : According to the results, we can expect that distilled red-ginseng Herbal Acupuncture may be further effccts in anti-cancer and immune improvement if increasing concentration.

• Magazine of the Korean Society of Agricultural Engineers
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• v.8 no.2
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• pp.1124-1140
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• 1966

'This hydraulic experiment have been practised Juk an Reservoir spillway and discharge 'channel which the province Kyong Buk was constructed and designed U. hook, for seizing all state of hydraulic. As result of the experimellt planning and making the model test, it has gained the necessary data at the amendment, projection of the most rational and economical result. 1. Project (1) Experiment project....1/30 of the discharge (2) project flood....0.01945 $m^3$/sec (rapidly) 2. Design Experiment It were sighted the water level for the nine point (L. & R. sides of No. O, L. & R. of No.1, L. side of NO.2, NO.3, No. 4 and NO.5), but it appeared each other that the lowest water level was 0.63 m at spillway (No.5) and the highest water level 0.735m less than planning water level O.75 m at No. 0. It was regarded as the phenomena appearing the difference from the calculation of the rational formular and coefficient of discharge. 3. Experiment examine E. ${\circled1}$ As a table (2) it had not a difference in comparision with design and was some lower value than design experiment's. E ..${\circled2}$) !twas same table (3) in a consequence of Experiment contracted Rocky cutting. E.${\circled3}$. ${\circled4}$ It was done amend.ment Experiment by elevating G.H. in only control point, but was not sure result as a table (2)(3)(4), and so it was changed largely in ${\circled5}$ Experiment. E. ${\circled5}$ Increasing water level was understanded to be proportion to $V^2$ in consideration of centrifugal force in the curve part and showed velocity contracting in curve the effect order's being regular in consequence of 1/6 sloped extending G.H. attached from 5 No. 0 to 1. 50 m, to S No. 0+5m. (S; discharge channel number).

• Journal of Korean Elementary Science Education
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• v.30 no.4
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• pp.524-534
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• 2011

This study is to ascertain pre-service teachers' conceptions for the causes of season change, to verify their conceptional mistakes, and to analyze how their conceptions are changed while presenting Disproof-Experiment Model where they cannot explain it with their current conceptions. 32 junior students of Education universities, pre-service elementary teachers, located at the middle of Korea participated in this research including two interviews and one experiment activity. As a result of analyzing of the data, the pre-service teachers held diverse conceptions for the causes of season change such as to mistake the phenomena, the distance between the earth and the sun, the tilting of the rotation axis and the revolving around the sun while changing the tilting direction of the rotation axis as the cause. After applying Disproof-Experiment Model designed by the researchers in order to change the current conception above, the conception changes of the pre-service teachers were investigated. Diverse Disproof-Experiment Models were used differently depending on the pre-service teachers' conceptions. As a result of the application of Disproof-Experiment Model, 26 out of 28 pre-service teachers were changed to scientific conceptions. It was determined that in order to modify pre-service teachers' conceptions, designing and presenting the Disproof-Experiment Model appropriate to their conceptions are effective after analyzing their conceptions. In case of conceptions that pre-service teachers feel difficult, it was established that unraveling experiment models prescribed after investigating the preconceptions and identifying the misconceptions are important.

• Journal of Plant Biotechnology
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• v.30 no.4
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• pp.369-373
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• 2003

In spite of potential benefits of anther culture, low productivity of plant regeneration in some genotypes; e.g. tonsil and indica rice, is one of the major obstacles for practical use of anther culture. This study was conducted to improve cold shock method and carbohydrate source for increasing the efficiency of anther culture in rice. The most common carbon source, sucrose was replaced to maltose, which has two molecules of glucose. Maltose increased callus induction 1.4-to 1.8-fold higher in japonica rice, 3.2-to 11.6-fold in tongil types and 2.7-fold in indica rice IR50. Callus induction was increased from 0.2％ to 12.5％ in maltose medium compared to the medium supplemented with sucrose plus glucose in indica rice "Tetep". A simple procedure of vacuum packaging of panicles during cold shock treatment prolonged not only anther viability more than 15 days but also increased callus induction more than 2-fold compared to open-air storage (conventional method). Combining of above two methods, callus induction was increased 28 to 56％ in japonica, 13 to 33％ in tonsil type and 12 to 31％ in indica rice. Plant regeneration was increased 14 to 35％ in japonica, 10 to 20％ in tonsil and 4 to 15％ in indica rice, respectively.

• Journal of Bio-Environment Control
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• v.16 no.3
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• pp.167-173
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• 2007

This study was conducted to improve light environment of oriental melon cultivation in winter season. Three polyolefin foreign films (J-1, J-2, J-3) and three polyethylene domestic films (K-1, K-2, K-3) with different film thickness, ultraviolet ray interception and infrared ray absorption were used. As the result of this experiment, soluble solid of oriental melon fruit in K-3 was $14.3^{\circ}Brix$, those in J-3 and J-2 were higher by 1.3 and $0.8^{\circ}Brix$, respectively. Chromaticity (a value) of pericarp in K-3 was 0.5, those in J-3, J-1 and J-2 were higher by 3.3, 2.3 and 1.9, respectively. Especially, fermented and malformed fruit rates in J-1, J-2 and J-3 were decreased and marketable fruit rates were increased. Marketable yield in K-3 was 1,622 kg per 10a, those in J-1, J-3 and J-2 were increased by 31.2%, 23.8% and 18.5% compare to K-3, respectively. In this study, Polyolefin films (J-1, J-2, J-3) with thickness and infrared ray absorption ratio keeping higher heat conservation, therefore, soluble solid and chromaticity of fruit were increased, fermented fruit rate was decreased, and marketable fruit rate and yield were increased.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.05a
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• pp.801-806
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• 2001

In the latest, the construction period became the most important factor in the domestic building works because buildings is higher and larger gradually. Accordingly, cold-weathering concrete constructions are performed more and more. So, the demands of concrete quality management methods are increased in cold-weathering concrete constructions. In this study, the mock-up experiment was performed to correct input data in the kimpo H construction field. Using the results of this experiment, the method of temperature analysis was presented to prevent early aged freezing damage and to control thermal crack in this study.

• Proceedings of the Korea Concrete Institute Conference
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• 2001.11a
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• pp.1123-1128
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• 2001

In this study, As a plan of essential solution for out-door air pollution, a basic study was carried out to develop a paint with photocatalystic $TiO_{2}$ which can eliminate the $NO_{X}$ from atmosphere. A series of Experiment were carried out according to kind of binder, photocatalyst, light source. Through Experiment of out-door exposure test, the endurance ability and NOx removal efficiency of the specimen were evaluated.

• Fire Science and Engineering
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• v.7 no.2
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• pp.3-12
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• 1993

The closed type sprinkler head is a component of sprinkler system for fire protection. The purpose of this study is to inverstigate the influence factors of the responsiveness of the head by heated wind tunnel experiment. As the result of this study, it was found that response time index and conduction parameter showed the same characteristic quantitative changes to head types and test methods.

• Journal of Food Hygiene and Safety
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• v.31 no.5
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• pp.335-341
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• 2016

This study was performed to provide basic data of Saekso 2 corn kernels. Proximate composition, free sugars, fatty acids and anthocyanin content of Saekso 2 corn kernels were analyzed. Proximate composition of dried Saekso 2 corn kernels were represented 8.84% moisture, 1.44% crude ash, 5.46% crude lipid, 10.31% crude protein. Free sugars composition by HPLC/ELSD showed that sucrose (1.00%), glucose (0.63%), maltose (0.52%), fructose (0.44%) were present. The composition of fatty acids in Saekso 2 corn kernels was analyzed by GC/FID. 11 species of fatty acids were analyzed in Saekso 2 corn kernels. The ratio of saturated fatty acids and unsaturated fatty acids 16.09 : 83.91. Content of linoleic acid was the highest in fatty acids. The total anthocyanin content in Saekso 2 corn kernels was 0.24% by UV/Vis. Anthocyanin components separated and quantified using HPLC/MS/MS. Cyanidin 3-O-glucoside chloride (C-3-G), pelargonidin 3-O-glucoside chloride (Pg-3-G) and peonidin 3-O-glucoside chloride (Pn-3-G) of anthocyanin were analyzed in Saekso 2 corn kernels.