초등학교 학생들을 위한 과학탐구능력 측정 도구 개발

조선형,정수길 淸州敎育大學校 科學敎育硏究所 1996 科學과 數學敎育論文集 Vol.17 No.-

The purpose of this study was to develop the science education items for 5th grade classes in Korean elementary school. The inquiry learning is recently showing more high achievement in learning method than traditional either extension of science inquiry skills or coefficiently score and experimental skills. Past quarter of a century, in spite of the inquiry learning declines its teaching method, but it should be encourage the teaching method of science and technology in society(STS) in and out of Korea on thesedays. There are no useful evaluation items of inquiry learning in elementary school, and so need good them according to teach the inquiry learning for achieved the goal of science teaching. The Author studied the development of instrument of measuring science inquiry skills of elementary school students. The 10 science inquiry skill properties were selected from SAPA program, with what are observing, classifying, measuring, predicting, inferring and operating instruments, controlling variabling and concluding or generalization on corporational inquiry skills in material things, motion and energy, life and earth science. The evaluation items are 25 with which divided into 10 skills that developed 2 dr 3 items for 40 minutes. Each point of validity and objectivity are 0.92 what same in the first treatment to 130 students and 177 students in second. In second(II) treatment, the standard deviation 3.712, the coefficient 0.568, average index of discrimination 0.347, index of response 63.9%, average index of difficulty 52.19, and measuring standard error 0.297. At last, the developing evaluation items are almostly very well by the indexes, but a few items(1,6 and some others) are need to change or to make clear once again.

해수 환경에서의 철근과 GFRP리바의 굽힘강도 특성에 관한 연구

한길영,최명선,곽상묵 朝鮮大學校 機械技術硏究所 2003 機械技術硏究 Vol.6 No.1

Fiber reinforced plastics(FRP) attracted muGh attention as a form of concrete reinforcement in the past decade. Compared with existing construction matrials, FRP possesses many advantages such as light-weight. high-strength, corrosion resistant properties, etc. Among other fabrication process of GFRP, pultrusion is one of the promising ones for civil infrastructure application. This paper describes the need for a ductile Fiber Reinforced Plastics (FRP) reinforcement for concrete structures. To promte the degradation of the adhesive condition a t the fiber-matrix micro interface without matrix dissolution loss were carried out in salt water surrounding. The absorption properties and the bending strength were compared about GFRP rebar and steel bar. Due to the fiber permeability absorption of moisture take place through both the fiber and the matrix. The diffusivities obtained for Glass-Polyester are found to be in good agreement with those available in the existing literature.

분리된 뇌조직의 수초화세포에 관한 연구

고선용,안의태,양남길,고정식,박경호 순천향의학연구소 1995 Journal of Soonchunhyang Medical Science Vol.1 No.2

중추신경계통의 신경세포들은 긴 축삭돌기로서 다른 신경세포와 연접을 이루기 때문에 뇌손상시 나타나는 반응도 신경로의 방향과 관계가 깊다. 대부분의 긴 축삭은 수초집으로 둘러싸여 보호를 받고 있고 또 수초는 축삭의 대사활동에 중요한 기능을 발휘한다. 뇌가 손상받아 축삭들이 절단될 때 퇴행되는 축삭을 둘러싼 수초집의 다양한 변화는 손상부위의 괴사과정, 치유과정 및 부분적 재생기능에 중요한 요소가 된다. 본 실험에서는 뇌속에 주위의 다른 신경세포와 의 연결이 단절된 뇌조직의 기둥을 만들고 그속에서 일어나는 형태학적 반응 가운데서 특히 수초구조물의 특수한 반응을 연구하였다. 3Kg 정도의 고양이를 nembutal로 마취시키고 뇌정위고정대에 고정시킨 다음 전두골의 일부를 절개한 후 직경 5mm 크기의 원통형칼날을 내려 눌러서 뇌조직의 기둥이 주변으로 부터 분리되도록 했다. 이때 부위선택은 뇌지도를 이용하여 중간줄무늬체동맥이 아래로 부터 올라오는 것이 손상되지 않도록 해서, 분리된 뇌조직이 계속하여 혈액공급을 받을 수 있도록 하였다. 3~4주동안 생존 시킨 후 1% glutaraldehyde 와 1% paraformaldehyde 용액으로 뇌를 고정시켰고 일반적인 술식으로 표본을 작성하여 전자현미경으로 관찰하였다. 관찰 결과 손상된 줄무늬체기저핵 안에서는 많은 수초구주물들이 불규칙한 모습을 지녔으며, 특히 수초집이 팽되되고 심하게 쭈그러드는 것들이 많았으나 이때도 수초의 기본구조는 흐트러지지 않고 정상에 가까운 것이 많았다. 이는 비록 절단된 축삭이 괴사하여 소멸되더라도, 이를 둘러싼 수초집을 만들고 유지해 온 희돌기아교세포가 건재하기 때문에 아직도 기본구조를 유지한 것으로 생각되었다. 특히 전체적인 모양 심하게 변하는 것은 희돌기아교세포가 오히려 활성화되어 새로운 변형을 시도하는 것으로 생각되며, 그 대표적인 예로서 여유분의 수초집이 신경종말을 비롯한 다른 구조물을 흡인하거나 둘러싸는 현상을 보였다. 가장 특이한 경우로는 거대화된 수초집 속에 상당수의 세포들이 들어 있는 수초화세포의 출현이었다. 이들 세포의 성분을 확정하기는 어려우나 형태학적 특징과 세포의 이동특성, 포식형태등으로 볼때 이 세포들이 별아교세포 성분인 것으로 판단하였다. 이와 같은 별아교세포의 수초화는 이 세포들이 손상받은 뇌조직이 치유과정에서 수초집 안팎의 섬유화를 유도하고, 새로이 재생되려는 축삭의 자라나갈 자리를 차지하므로써 손상된 축삭의 재생을 막는 원인이 될 수 있다고 결론지었다. Since the neurones in the central nervous system make contact with other neurones through their long axons, the tissue reactions following brain damage are complicate, and the reactions appear largely along the course of transected axons. Myelin sheaths around transected axons have to show curious reactions. because they belong to oligodendroglia instead of belong to component. In this experiment, a tissue column of fundus striati nucleus was made by pressing a tube-knife of 5 mm diameter down toward the basal forebrain area, where the middle striatal arteries penetrate the brain. Three to four weeks after the stereotaxic isolation, tissue blocks are punched out from fundus striati nucleus. Ultrathin sections are obtained through the observations are discussed and the following results are obtained. Many axons and their myelin sheaths showed various transformations, including the redundant myelin sheaths and myelinated cells. Many redundant myelin sheaths are wrapped around, or sucked in the axon terminals or other structures. Redundant myelin sheath should be very active structures, even after the degeneration of axon within it, since the myelin sheath is a component of oligodendroglia instead of axonal component. Myelinated cells, the cells dwelled within some giant-swelled myelin sheaths, are observed. They contained relatively light cytoplasm with scanty cell other cell components or axon terminals, within the giant myelin capsule. The structural characteristics and the moldability into the myelin sheath, of these myelinated cells suggested that they are activated astroglial cells. Astroglial activities within or out of the transected myelin may prohibit the new axonal sprouts growing into the myelin sheath during regeneration course of nerve fiber in the central nervous system.

원관내 비정상 유량계측에 관한 연구

박선종,박길문,강형선 조선대학교 생산기술연구소 1996 生産技術硏究 Vol.18 No.1

A new instantaneous unsteady flowmeter for hydraulic pipelines using cy lindrical chokes is studied experimentally. The instantaneous flowmeter is predicted in real time from measurement of pressure difference on both sides of cylinderical choke through the numerical operation of the transfer function between flowmeter and pressure drop. The sampling frequency can be set at 50Hz and 30Hz to maintain high response employing exclusive parallel operating circuits for multiplications and sums. Under unsteady laminar flow condition. the estimated flow rate waveforms are in good agreement with those measured by CCFM. Particularly. the dynamic response accuracy of the extrapolation method are experimentally investigaated in detail.

체납관세의 민간위탁징수방안에 관한 연구

라공우,이선표,송선욱,이상신,홍길종 한국관세학회 2009 관세학회지 Vol.10 No.2

This study investigate unofficial consignment as a part of collection device size of the customs duties arrears. Customs duties arrears is one of serious problems that Korea Customs Service has faced, there is no systematic incentive to prevent the customs duties arrears. So that the unofficial consignment obtain good results collection of customs duties arrears, the unofficial consignment carry forward following device : First, unofficial consignment company is under competent institutions because unofficial consignment company fulfill statutes, taxpayers right care, etc. Second, maximization collection of the customs duties arrears grant reasonable collection discretion for unofficial consignment company. Third, it need the foundation of computer system in order to classification, management, delivery for information of the customs duties arrears.

보은, 괴산지역 황색종 담배포장의 자갈함량과 전작물별 생육상황 조사

최상진,석영선,배길관 충북대학교 엽연초연구소 2001 煙草硏究 Vol.18 No.-

This studies were conducted to investigate the growth characteristics by gravel contents and pre-crops of Flue-cured tobacco cultivated fields at Boeun and Koesan county extension. The results were summarized as follows. pH, available phosphorous(P2O5), inorganic nitrogen(NH4-N + NO3-N), organic contents, cation exchanging capacity(C.E.C) were much more at Koesan than those of Boeun. The gravel content were approximately from 20% to 70% and its content was much more containable at Koesan than Boeun. Stalk length, stalk diameter, leaf numbers, dry weight, largest leaf, the length and the width were higher at Koesan than Boeun. The growth of tobacco by pre-crop was higher tobacco fields than pepper fields.

Pancreatic β cell Regeneration in the Silk Fibroin Ingested C57BL/KsJ-db/db mice

Seon-Gil Do,Jun-Gyo Suh,Chung-Seop Kim,Hyun-Jin Kim,Sang-Rae Lee,Seung-Hun Oh,Jin-Bong Kim,Moo-Ho Won,Mun Han Lee,Joong-Hee Namh,Yang-Seok Oh 한국실험동물학회 2000 한국실험동물학회 학술발표대회 논문집 Vol.2000 No.-

P-9. Plasma Lipid and Lipoprotein Levels in Diabetic-Hypertensive Rats

Seon Gil Do,Je Kyung Seong,Hee Kyung Jin,Yang Seok Oh 한국실험동물학회 1993 한국실험동물학회 학술발표대회 논문집 Vol.1993 No.-

Silicon Strain Gauge Load Cell for Weighting Disdrometer

( Seon Gil Lee ),( Young Soon Moon ),( Won Ho Son ),( Young Ho Sohn ),( Sie Young Choi ) 한국센서학회 2013 센서학회지 Vol.22 No.5

In this paper, the usability of a compact silicon strain gauge load cell in a weighting disdrometer for measuring the impact load of a falling raindrop is introduced for application in a multi-meteorological sensor. The silicon strain gauge load cell is based on the piezoresistive effect, which has a high linearity output from the momentum of the raindrop and the simplicity of signal processing. The weighting disdrometer shows a high sensitivity of 7.8 mV/g in static load measurement when the diaphragm thickness of the load cell is 250 μm.

Sublethal Effects of Imidacloprid and Flonicamid on Cotton Aphid, Aphis gossypii Glover and Feeding Behavior Analysis

Seon-Woo Lee,Ki-Su Ahn,Hyun-Na Koo,Gil-Hah Kim 한국응용곤충학회 2012 한국응용곤충학회 학술대회논문집 Vol.2012 No.05

The cotton aphid, Aphis gossypii Glover is an important sap-sucking pest of many pant, including cucumber and pepper. The objective of the present study was to determine the effects of sublethal concentrations of two insecticides (imidacloprid and flonicamid) and the action mechanisms on the feeding behavior of A. gossypii. The median lethal concentrations (LC50) of imidacloprid and flonicamid for adult A. gossypii were 2.01 and 1.92 ppm, respectively. The sublethal concentrations of imidacloprid were 0.22 ppm (LC10) and 0.82 ppm (LC30), and those of flonicamid were 0.094 ppm (LC10) and 0.56 ppm (LC30). The developmental period of A. gossypii nymphs at LC30 was 3.6 days for both insecticide which shorter than controls (4.2 days). Adult longevities at LC10 and LC30 of imidacloprid were 15.2 and 13.6 days, respectively. Adult longevity at LC10 and LC30 of flonicamid was 11.1 and 9.9 days, respectively. Control adult longevity was 15.5 days. Total fecundity was decreased at both sublethal concentration of two insecticides. Feeding behavior analysis using an electrical penetration graph showed that sublethal doses of imidacloprid and flonicamid had significant effects on the duration of phloem ingestion. However, higher doses of flonicamid induced starvation by inhibition of phloem ingestion and higher doses of imidacloprid induced contact toxicity rather than inhibition of feeding behavior.