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과학교과교육 : 서안경계류를 모식화한 실험을 통한 학생들의 이해도 변화 분석
장승환 ( Swung Hwan Jang ),신정선 ( Jung Sun Shin ),박효진 ( Hyo Jin Park ),문병권 ( Byung Kwon Moon ) 전북대학교 과학교육연구소 2010 과학과 과학교육 논문지 Vol.35 No.-
본 연구는 전라북도 전주에 위치한 고등학교 학생들에게 장승환 외(2010)이 개발한 장치를 사용하여 학생들이 서안경계류를 이해하는데 도움이 되는지 알아보고자 하였다. 미리 실험을 실시한 학생들은 사전 조사와 비교하여 사후 검사에서 서안경계류 관련 항목이 높은 성취도를 보였으나, 실험집단과 통제집단 모두 전향력에 관한 항목에서는 큰 차이를 보이지 않았다. We investigated if the apparatus and method developed by Jang et al (2010) would help the students understand the properties of western boundary current (WBC). Students showed the high achievement in understanding of the WBC if they have carded out the developed experiment in advance. The material we tested, however, did not show any clear effects to understand the Coriolis force.
직물 복합재료를 이용한 드레이핑 헬멧의 미소 변형 관찰
장승환 ( Jang Seung Hwan ) 한국복합재료학회 2003 Composites research Vol.16 No.4
본 논문에서는 직물 복합재료로 제조된 드레이핑 헬멧의 등가 토우 두께, 종방향 토우의 진폭, 토우 간격 등의 여러 가지 토우 파라메터들을 관찰하고, 현미경 관찰을 통해 직물 복합재료 구조의 각 방향에 따른 미세 변형을 서로 비교하였다. 또한 이러한 관찰 결과들을 동일한 토우 구조를 가지는 건직물 시편을 이용한 일방향 편향 인장실험, 이축 인장실험 결과와 비교하였으며, 오토클레이브에서 경화된 여러 가지 성형 조건을 가진 시편들과도 비교하였다. 직물 복합재료(새틴 직물 복합재료)로 제작된 드레이핑 헬멧으로부터 현미경 관찰 시편을 얻었으며, 각 시편의 종방향과 횡방향에 대해 각각 관찰하였다. 관찰 결과로부터, 토우 방향에 따른 서로 다른 변형 패턴을 확인할 수 있었으며, 드레이핑 공정 중 금형의 기하학적 조건이 직물 복합재료의 변형에 미치는 영향을 확인하였다. In this paper, various tow parameters such as equivalent tow thickness. amplitude of longitudinal tow and tow intervals were investigated and compared with each other by using microscopic observation to find out the exact deformation patterns between both directions of the fabric structure(Longitudina1 and Transverse Directions). And those observation results were compared with bias extension, biaxial tests results with dry fabric which has the same tow structure as the draped helmet materials and also compared with prepreg specimen which is cured by autoclave moulding without vacuum and pressure condition. Specimens for the observation were taken from draped helmet which is made of fabric composite(Five Harness Satin Weave). From the observation results, it was found that there are different deformation pattern between tow directions and effect of geometric condition on the deformation of the fabric materials during draping process was verified.
장승환 ( Seung Hwan Jang ),변보석 ( Bo Suk Byun ) 대한설비관리학회 2015 대한설비관리학회지 Vol.20 No.2
This study describes the results of Preliminary Hazard Analysis (PHA) performed for Train Control System (TCS) of Honam KTX Line. PHA is performed to identify hazards at system level based on the risk-based approach followed by IEC 61508 and other relevant international standards. The hazards are firstly classified by the operational functions of railway system proposed by AEIF (The European Association for Railway Interoperability). Then, the hazards are identified in more detail according to the function of TCS in the process of the railway operation. In doing this, the relevant equipment among TCS are identified. The result shows that PHA can be used to demonstrate which hazard could be expected and which consequences could occur in the process of railway operation as the result of their functional failure(s). This way of description is a starting point for an operation or technical realization demanding TCS. In addition, the result can be used for allocating Safety Integrity Level (Sn") for each subsystem composing TCS and for generating any safety requirements that might not be taken into account in the system requirements.
품질경영시스템 활용이 R&D 연구원의 사용자 만족도에 미치는 영향
장승환 ( Seung Hwan Jang ),연주한 ( Ju Han Yeon ) 대한설비관리학회 2016 대한설비관리학회지 Vol.21 No.1
This paper is intended to examine a relationship regarding whether innovativeness, interactivity, system quality and information quality, extended variable, has an effect on R&D researcher`s user satisfaction through the mediation of ease of use and usefulness after applying an extended technology acceptance model to quality management system. A total of 250 questionnaires were distributed through face-to-face interview, and 158 questionnaires were used for statistical analysis. In order to prove the validity of results of testing a hypothesis, the validity and reliability of measurement instrument was tested in advance. According to the results of testing an indirect effect on information quality, system quality, interactivity and innovativeness, independent variable, it shows that innovativeness, system quality and information quality produced a statistically significant indirect effect on user satisfaction. It is thought that the results of paper can be utilized to prepare for effective system development, establishment and design through the quality management system user satisfaction of R&D researchers at the point of contact for quality management that company pursues.
장승환(Jang, Sung-Hwan),김도겸(Kim, Do-Gyeum),이장화(Lee, Jang-Hwa) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.1
This paper represents the fundamental research results for the durability of nuclear power plant(NPP) which used to concrete mixed with fly ash in Korea. On the other hand, high level analytical equipments like SEM, XRD etc. allow to obtain more accurate information of cementitious materials. Thus, chemical and surface analysis of cement paste with 30% of fly ash is performed using these techniques. The X-ray differaction (XRD) results showed that the hydration reaction of cement is more dominant compared to pozzolanic reaction of fly ash at early ages. Also, the scanning electron microscope (SEM) results revealed the surface of fly ash particles was covered by C-S-H gels due to the reaction of fly ash and calcium hydroxide.
장승환 ( Jang Sung-hwan ),김도겸 ( Kim Do-gyeum ),이장화 ( Lee Jang-hwa ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.1
This paper represents the fundamental research results for the durability of nuclear power plant(NPP) which used to concrete mixed with fly ash in Korea. On the other hand, high level analytical equipments like SEM, XRD etc. allow to obtain more accurate information of cementitious materials. Thus, chemical and surface analysis of cement paste with 30% of fly ash is performed using these techniques. The X-ray differaction (XRD) results showed that the hydration reaction of cement is more dominant compared to pozzolanic reaction of fly ash at early ages. Also, the scanning electron microscope (SEM) results revealed the surface of fly ash particles was covered by C-S-H gels due to the reaction of fly ash and calcium hydroxide.