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기하 증명에서 중학생들의 시각의존적 비약 인식에 대한 연구
강정기,Kang, JeongGi 영남수학회 2014 East Asian mathematical journal Vol.30 No.2
Although a figure expression has a role of mediator in the geometry proof, it is not admitted to prove based on a vision-dependent feature. This study starts from the problem that although a figure expression has an important role in the geometry proof, a lot of students don't understand the limit of vision-dependent feature in the figure expression. We will investigate this problem to understand cognitive characteristic of students. Moreover, we try to get the didactical implications. To do this, we investigate the cognitive ability for a limit of vision-dependent feature, targeting a class of middle school seniors And we will have a personal interview with four students who show a lack of sense of limit of vision-dependent feature in the figure expression and two students for who it is difficult to judge that they don't understand the limit of vision-dependent feature in the figure expression. We will observe and analyzed the cognitive characteristic of six students. Based on the analysis, we will finally discuss on the didactical implications to help students understand the limit of vision-dependent feature in the figure expression.
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강정기,노은환,Kang, JeongGi,Roh, EunHwan 영남수학회 2013 East Asian mathematical journal Vol.29 No.4
This paper started from a question: Can it help a student solve the problem to give supports in point of view of a teacher knowing the solution. We performed a case study to get an answer for the question. We analysed a case which students do not make full use of data in the mathematical problem from this point of view of the mental representation. We examined closely the cause for not making full use of data. We got that the wrong mental representation which the students get from data in the problem lead to not making full use of data. We knew that it is insufficient to present the data not making use of. To help a student truly, it is necessary to give a aid based on a student's mental representation. From the conclusion of study, We got that figuring out student's mental representation is important and hope that many investigation about student's mental representation for various problem occur with frequency.
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강정기,유우준,최돈묵 한국화재소방학회 2015 한국화재소방학회논문지 Vol.29 No.4
In this study, the conditions of explosion range of gasoline, which is used as combustion improver, are experimentallyanalyzed. Two types of compartment, which is the small scale (0.5 m × 0.5 m × 1.0 m) and the middle scale(0.5 m × 0.5 m × 1.0 m), are mocked-up and the auto-control systems are installed in order to measure the vaporized gasolineand the moment of pressure, ignition time and maximum pressure. In case the maximum flammable limit of gasolineis up to 22.4 Vol% not the generalized range of 1.4~7.6 Vol% when nichrome igniter of 700 oC is used. These results canbe appled to the analytical prediction of fire identification in the field of explosion. 본 연구에서는 휘발유가 연소촉진제로 사용되어 폭발현상이 발생할 수 있는 조건을 실험적으로 분석하였다. 이를 위해서 소형(Small scale 0.5 m × 0.5 m × 1.0 m), 및 중형(Middle 0.9 m × 0.9 m × 1.5 m) 구획 공간을 제작하고 자동제어시스템을 구성하여 공간 내부에서 기화된 휘발유 양을 산출하였으며, 공간 내부의 순간 압력, 착화 시간 그리고 최대 압력의 시간 간격을 측정하였다. 그 결과 최대 온도 약 700 oC 정도인 니크롬선을 점화원으로 사용한 경우 휘발유 폭발 범위는 1.4 Vol%~7.6 Vol% 보다 넓은 최대 22.4 Vol%까지 발생하였다. 본 연구의 결과는 유증기에 의한 폭발현장 조사시 화재 감식을 분석적으로 판단하는데 유용한 자료가 될 것으로 사료된다.
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강정기,김창수 호남수학회 2009 호남수학학술지 Vol.31 No.3
The notions of pre-local function, semi-local functions and ®-local functions with respect to a topology and an ideal are in- troduced, and several properties are investigated. Also, the concept of P-I-open sets and P-I-closed sets in ideal topological spaces are discussed. Relations between I-open sets and P-I-open sets are provided, and several properties related to P-I-open sets, pre-local functions, semi-local functions and pre-local functions with respect to a topology and an ideal are investigated.
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건축용 압출법 단열판(XPS)의 자기소화성에 대한 실험적 연구 및 제도적 관리에 관한 제언
강정기,최돈묵 한국화재소방학회 2020 한국화재소방학회논문지 Vol.34 No.3
The Korea Industrial Standards (KS) stipulates methods and test procedures for measuring the horizontal combustibilityof cellular plastics exposed to small flames (KS M ISO 9772:2018) and recommendations regarding the magnetic digestionof extruded polystyrene insulation (XPS) for measurement results (KS M 3808:2020). Although products that are certifiedto conform to KS standards must have burning characteristics (self-extinguishing), they are incinerated and spread by weldsat construction sites, causing significant human and property damages. In this study, XPS produced by five companies,certified by KS, and sold in the market were purchased and tested for ignition and diffusion caused by a weld bullion ata construction site. The results showed that the five products had differences in performance. Three out of the five productswere found to be self-saturated, but the other two were easily ignited and diffused, making it difficult for them to beself-extinguishing. Based on the result of this experimental investigation in line with the KS regulations, all the three typesof products, including two types of products that were incinerated through weld defects, were found to be non-selfextinguishing,as specified in KS M 3808. 한국산업표준(KS)은 발포 플라스틱 제품에 대하여 소형화염에 의한 수평 연소성의 측정 방법 및 시험절차를 규정(KS M ISO 9772:2018)하고 측정 결과에 대한 압출법 단열판(이하 XPS)의 자기소화성과 관련한 성능 및 기준을 KS규격(KS M 3808:2020)에서 규정하고 있다. KS 규격에 적합함을 인증 받은 제품은 연소성(이하 ‘자기소화성’)을 가지고 있어야 함에도 공사현장에서 용접불티 등에 의해 착화 및 확산되어 대량의 인명과 재산 피해가 발생하고 있는실정이다. 본 연구에서는 KS 인증을 받고 시중에 판매 중인 5개사의 XPS 단열재를 구입하여 공사현장에서 발생되는용접불티에 의한 착화 및 확산 여부를 실험하였다. 실험결과, 5개사의 제품 중 3개사는 성능의 차이는 있으나 자기소화성이 있는 것으로 확인되었으나, 2개사는 쉽게 착화 및 확산되어 자기소화성이 있다고 보기 어려웠다. 동종의 제품에 대하여 KS 규정에 따른 실험결과, 용접불티에 의해 착화되었던 제품 2종을 포함한 총 3종의 제품이 KS M 3808에서 규정한 자기소화성이 없는 것으로 확인되었다.
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