• 과학교육연구지
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• 제39권3호
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• pp.343-357
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• 2015

본 연구는 과학 교과서의 '생명의 진화'와 '인류의 건강과 과학기술' 영역에서 STS 내용의 포함정도를 분석하여 2009 개정 교육과정의 목표에 잘 부합하는지 여부를 규명하는 것을 연구 목적으로 하였다. 7종의 교과서를 STS 주제 영역을 기준으로 분석한 결과, 비율로 보면, 적게는 16.67%를, 많게는 58.33%를 포함하고 있는 것으로 나타났다. 그러나 STS와 관련된 주제 중, '우주개발과 국방'과 '환경문제'는 표현되지 않았다. STS 활동 영역에서는 '구조화된 토론', '자료 해석', '조사 연구' 영역에서 많은 활동 횟수를 보이고 있음을 알 수 있었다. 반면 '현장 활동', '문제 해결과 의사 결정', '역할 놀이', '모의 실험', '사례 연구', '연구 고안'의 STS 활동 영역은 그 횟수가 적게 나타났다. 그러나 2009 개정 과학 교과서에서는 STS 활동 영역이 다양하게 포함하고 있음을 알 수 있었다. 각 영역별 STS 내용 포함률을 분석한 결과, '과학의 응용성'에 해당하는 내용이 67.57%로 최대 내용을 구성하고 있었지만, '과학과 관련된 직업에 대한 인식'은 1.63%로 그 빈도의 차이가 켰다. '과학의 응용성' 이외의 7가지 내용 준거는 10%를 조금 넘거나, 대부분 10%가 채 되지 않는 비율로 각각의 내용을 포함하고 있었다. 7종의 고등학교 융합형 '과학' 교과서 생명과학 영역에 포함된 STS 내용은 평균 20.75%로, 교과서별 최소 12.35%에서부터 많게는 26.90%를 포함하고 있었다.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2001년도 춘계학술대회 논문집
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• pp.89-93
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• 2001

This study was carried out to investigate the warm deep drawability of square cups of clad sheet metals, by changing temperatures of die and blankholder and blank materials. Two kinds of clad sheet metals, STS304-A1050-STS304 and STS304-A1050-STS430 were chosen for experiments. The relative drawing depth of STS304-A1050-STS304 clad sheet was increased up to 4.4 at $150^{\circ}C$ that was $29\%$ higher than at room temperature, whereas STS304-A1050-STS430 material was improved to 3.65 at $120^{\circ}C$ which was $16\%$ better than at room temperature. In addition, comparison of wall thickness and hardness of a warm drawn cup with those of room temperature showed more even distributions. Therefore, warm forming technique was confirmed to ive better results in deep drawing of stainless clad sheet metal.

• 한국초등과학교육학회지:초등과학교육
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• 제21권2호
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• pp.159-170
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• 2002

This study examined the effect on the education of scientific attitude in the process of primary school education by application of STS teaching-learning method with an unit of 6th grade in primary school "environmental pollution and nature conservation". The attitude relating science education, on the other side, is classified into 4 parts; attitude for science, social meaning of science, attitude for science subject and scientific attitude. The study of sexual difference on the above points was examined too. The results was taken as follows. 1. STS Teaching-learning method gives positive effect on the education of scientific attitude more than traditional teaching method, especially on the point of the attitude of science lesson and scientific attitude. 2. STS education has an great influence on the social meaning of the scientific attitude relating science education , investment in science, relation with society, solving social problem, contribution to development of society and technology 3. STS teaching-teaming is thought to be the learning that is more effective for boy than girl. In conclusion The STS Teaching-loaming method is preferable in order to increase the scientific attitude of the Elementary school students. students.

• 한국지구과학회지
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• 제18권6호
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• pp.473-479
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• 1997

본 연구의 목적은 STS프로그램을 적용한 수업이 학생들의 과학에 관련된 태도와 과학학습성취도에 미치는 효과를 분석하는데 있다. 연구 목적에 따라 고등학교 3학년 학생들을 실험집단과 통제집단으로 나눈 뒤, 약 6주 동안 실험집단은 본 연구자가 개발한 STS 프로그램을 사용하여 수업을 실시하고 통제집단은 강의 중심의 전통적 수업을 실시하였다. 연구 결과 과학에 관련된 태도에 있어 실험집단이 통제 집단보다 더 긍정적인 방향으로 태도가 향상되었고, 과학학습 성취도에 있어서도 실험집단이 더 높은 성취도 향상을 나타내었다.

• 한국표면공학회지
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• 제40권6호
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• pp.271-278
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• 2007

In this study, applicable possibility in chemical decontamination for reactor coolant pump(RCP) was investigated for the various stainless steels. The stainless steel(STS) 304 showed the best electrochemical properties for corrosion current density and the lowest weight loss ratio in chemical decontamination process model 3-3 than other materials. The weightloss quantity in chemical decontamination process model 3-3 presents the lowest value compare to the other chemical decontamination process model 1, 2, 3-1 and 3-2. In the case of SEM observation, the pitting corrosion was generated in both STS 415 and STS 431 with the increasing numbers of cycle. The intergranular corrosion in STS 431 was sporadically observed. The sizes of their pitting corrosion were also increased with increasing cycle numbers.

• 한국산업융합학회 논문집
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• 제26권3호
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• pp.411-419
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• 2023

In this paper, NIMONIC 86 material was tried to apply to exhaust valve for small-sized marine diesel engine. The both structural stability and thermal resistance in high temperature were needed to use the NIMONIC 86 material as exhaust valve for small-sized marine diesel eng ine. The purpose of this study is to investig ate the application of NIMONIC 86 material to exhaust valve of small-sized marine diesel engine by comparing, respectively, SUH 3 and STS 316 materials. As the results, NIMONIC 86 material has intermediate characteristics between SUH 3 and STS 316 materials in terms of the strength in condition of room temperature. Further NIMONIC 86 material was evaluated to have better characteristics than SUH 3 and STS 316 materials in terms of the thermal conductivity.

• 공학교육연구
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• 제13권4호
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• pp.43-50
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• 2010

이 연구의 목적은 STS(science-technology-society) 소양에 대한 대학생들의 관점을 알아보기 위한 것이다. STS 소양에 대한 견해는 과학과 기술의 정의, 과학 기술 사회의 상호 영향으로 범주를 나누었다. 연구대상은 서울과 제주 소재 3개 대학 공학계열 대학생(119명)과 사회계열 대학생(117명)이다. 연구 결과는 다음과 같다. 첫째, 과학과 기술의 정의에 대해 공학계열 대학생들은 생활의 편리성을 중시했고, 사회계열 대학생들은 현상을 설명하고 실험하는 것이라고 응답했다. 둘째, 두 집단은 과학-기술-사회의 상호관련성을 인식하고 있었다. 셋째, 두 집단은 과학기술자의 책임과 윤리, 기술의 이용 등에 대해 견해 차이를 보였다. 결론적으로 대학생들은 STS 소양과 관련해 높은 인식 수준을 나타냈다. 따라서 본 연구의 결과는 앞으로 대학 교육과정에서 STS 소양과 관련된 교과목을 개설하고 운영하는 데 있어서 중요한 시사점을 제공할 수 있을 것이다.

• 한국해양공학회지
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• 제16권3호
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• pp.59-64
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• 2002

In the present study, we examined the influence of prestrain on creep strength of Class M alloy(STS310S) and Class A(STS310J1TB) alloys containing precipitates. Prestrain was given by prior creep at a higher stress than the following creep stresses. Creep behaviour before and after stress change and creep rate of pre-strained specimens were compared with that of virgin specimens. Pre-straining produced the strain region where the strain rate was lower than that of a virgin specimen both for STS310J1TB and STS310S steels. The reason for this phenomenon was ascribable to the viscous motion of dislocations, the interaction between dislocations and precipitates in a STS310J1TB steel, and the interaction of dislocations with sub-boundaries in a STS310S steen which has the higher dislocation density and smaller subgrain size resulted from pre-straining at higher stress.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2004년도 춘계학술대회 논문집
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• pp.221-224
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• 2004

The clad samples of five plies of sheets comprising ferritic stainless steel (STS) and aluminum (Al) were prepared by roll-cladding at $350^{\circ}C$. The evolution of strain states and textures during roll-cladding of STS430/AA3003/AA3003/AA3 003/STS430 and STS430/AA3003/STS430/AA3003/STS430 was investigated by measurements of crystallographic textures and by simulations with the finite element method (FEM). Because the deformation mainly occurs in the Al layer during roll-cladding, the present investigation was focused on the Al layers located. The stacking sequence of sheet materials in the clad samples played an important role in the evolution of strain states during roll-cladding.

• 열처리공학회지
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• 제24권1호
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• pp.3-9
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• 2011

Plasma nitriding of stainless steels has been investigated over a range of temperature from 400 to $500^{\circ}C$ and time from 10 to 20 hours. Characterization of systematic materials was carried out in terms of mechanical properties and corrosion behaviors. The results showed that plasma nitriding conducted at low temperatures not only increased the surface hardness, but also improved the corrosion resistance of STS 316L, STS409L, and STS 420J2. It was found that plasma-nitriding treatment at $500^{\circ}C$ resulted in increasing the corrosion performance of STS 409L and STS 420J2, while STS 316L was observed with server and massive damage on surface due to the formation of CrN.