• 대한한의학원전학회지
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• 제28권1호
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• pp.151-172
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• 2015

Objectives : Though a socially constructed disease, the burden of infertility has been cast upon the individual in recent times, leading to aggressive medical technologies to achieve pregnancy without consideration of the complex relationships between individual and society that is involved in this life phenomenon. This study aims to restore the many aspects of infertility, first through its meaning in the medical classics. Methods : Texts were chosen from before and after the Song period, when the study and practice on women's health took a launch into becoming a specialized field. Huangdineijing, Jinguiyaolue, and Zhubingyuanhoulun listed basic theories considering the physiology and pathology of woman, while Jiaozhufurenlangfang, Donguibogam, and Fuqingzhuyixue dealt with specialized contents regarding women. Results : The findings were categorized into three major aspects of infertility; natural, medical and non-medical. The three aspects of infertility would not be easy to distinguish in real life, as they are inter-connected through the body as a site of embodiment. Conclusions : The discussion of the many aspects of infertility outside of the immediate medical definition implies the complexity of infertility as a life phenomenon, bringing attention to the importance of the experience in the life context.

• 공학교육연구
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• 제14권4호
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• pp.39-47
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• 2011

이 논문은 공학윤리를 확장하기 위한 연구의 일환으로 나노윤리(nanoethics)에 대해 검토했으며, 이를 위하여 나노기술의 역사적, 사회적, 윤리적 측면에 관한 다양한 자료들을 활용하였다. 이 논문에서는 나노기술의 위상과 발전과정에 대해 간략히 살펴본 후 나노기술의 윤리적 쟁점을 안전성 문제, 환경에 미치는 영향, 프라이버시 침해, 사회적 불평등, 군사적 이용, 인간능력의 향상 등으로 구분하여 분석하였다. 이어 나노윤리에 접근하는 원칙으로 대중의 이해 촉진, 참여적 거버넌스의 구축, 지속가능한 발전에의 기여, 사전예방의 원칙의 준수, 연구진실성의 확립을 제안하였다. 마지막으로 나노윤리에 대한 교육의 형태로 강의 모형, 조사 모형, 토론 모형을 종합한 방식에 주목하였다. 이러한 논의는 나노윤리에 대한 교육에서 활용할 수 있는 콘텐츠를 제공해 줄 수 있으며, 나노기술의 건전한 발전을 위한 기초로 작용할 수 있다.

• 한국과학교육학회지
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• 제24권4호
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• pp.785-801
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• 2004

A Typically-Perceived-Situation(TPS) is a situation which might be useful for conceptual learning of science, rising spontaneously in an individual's mind when someone is thinking about, or in relation to, any object such as physical object, concept, situation, etc. But, for a discussion about the TPS' usefulness in depth, we need to analyze the specific features of the TPS in relation to conceptual learning of science. This study investigated four elementary school students' TPSs related to the topic of the action of force, especially (a) 'the situation where force is being acted on an object', and (b) 'the situation where force is not being acted on an object', with an interview as well as with a drawing-and-explanation type questionnaire. Their TPSs were then compared with their concepts, checked by a misconception questionnaire of choice-and-explanation type. The results showed that the students' TPSs illustrated not only their conceptions about the action of force, but also gave more fruitful details of their ideas, including (a) clues of their conceptions, (b) concrete situations, and (c) their past experiences with emotional components. On the whole, the TPS's appeared to be rather stable, affected by their past experiences, and needed to be analyzed into their sub-units for more subtle details. Finally, some practical ways of how to apply the ideas of the TPS to the conceptual learning of science are suggested.

• 한국세라믹학회지
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• 제51권4호
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• pp.231-242
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• 2014

An interconnect in solid oxide fuel cells (SOFCs) electrically connects unit cells and separates fuel from oxidant in the adjoining cells. The interconnects can be divided broadly into two categories - ceramic and metallic interconnects. A thin and gastight ceramic layer is deposited onto a porous support, and metallic interconnects are coated with conductive ceramics to improve their surface stability. This paper provides a short review on ceramic materials for SOFC interconnects. After a brief discussion of the key requirements for interconnects, the article describes basic aspects of chromites and titanates with a perovskite structure for ceramic interconnects, followed by the introduction of dual-layer interconnects. Then, the paper presents protective coatings based on spinel-or perovskite-type oxides on metallic interconnects, which are capable of mitigating oxide scale growth and inhibiting Cr evaporation.

• Clinics in Shoulder and Elbow
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• 제23권2호
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• pp.94-99
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• 2020

Background: Intra-articular distal humeral fractures can be surgically challenging. It remains under discussion whether open reduction and internal fixation (ORIF) or total elbow arthroplasty (TEA) is more beneficial for treatment of the elderly. This study aimed to compare the clinical and functional outcomes of ORIF and TEA for managing intra-articular distal humerus fractures in patients aged 65 years or older. Methods: Patients who underwent ORIF (n=28) or TEA (n=43) for in intra-articular distal humerus fracture between May 2008 and December 2018 were reviewed. Range of motion, Mayo Elbow Performance Score (MEPS), Disabilities of the Arm, Shoulder, and Hand (DASH) score, radiologic outcomes, and surgical complications were evaluated at the final follow-up visit. Results: The ORIF and TEA groups showed a mean arc of flexion-extension of 97°±21° and 101°±12°, respectively. The mean MEPS and DASH scores were 94±15 and 27±12 points, respectively, in the ORIF group and 81±27 and 47±28 points in the TEA group. This difference was statistically significant. The incidence of total complications was similar between the groups. Conclusions: In patients older than 65 years with intra-articular distal humerus fracture, ORIF had better outcomes than TEA.

• 한국추진공학회지
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• 제11권2호
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• pp.79-85
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• 2007

Polyethylene-GOX (PE-GOX) 조합의 추진제를 사용하는 하이브리드 모터의 성능 예측 모델을 제시하였다. 성능에 영향을 미치는 인자들에 대해 자세한 고찰이 이루어 졌으며, 연료의 후퇴율과 산화제 조절 밸브의 개폐 응답 특성을 고려한 비정상 지배방정식을 구성하고 연소 중 O/F(산화제/연료)비에 따라 변화하는 열역학 데이터를 고려한 4차 Runge-Kutta 수치기법으로 해를 구하여 실험결과와 비교하여 잘 일치함을 확인하였다. 또한 연소 중 그레인의 후퇴율과 O/F비등의 성능 변수들의 영향을 분석하였다.

• 지구물리와물리탐사
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• 제23권2호
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• pp.89-96
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• 2020

물리탐사에서 유용한 3차원 좌표계 회전 문제를 일관성있게 정리하였다. 일관성을 유지하기 위한 기준으로 오른손 좌표계의 정의에서 출발하였다. 또한 능동 회전과 수동 회전의 개념을 설명하고, 서로 다른 좌표계 간의 회전 및 역회전은 전치행렬의 관계로서 기준 좌표계와 센서 좌표계 사이의 회전 관계를 명확히 하였다. 3차원 회전에서는 항법 등에서 사용하는 요-피치-롤(yaw-pitch-roll) 회전과 물리검층에서 쉽게 이해할 수 있는 방위각-편차-센서회전 회전 방식의 회전 행렬을 설명하였다. 또한, 이 둘과 Rodrigues 회전 공식에 의한 회전 행렬 각각의 각도를 구하는 수식을 정리하였다. 요-피치-롤 방식의 회전에서 나타나는 "Gimbal Lock" 현상을 그림과 수식으로 설명하고, 이의 해결방안으로 동원되는 사원수(quaternion)의 원리와 적용 방법에 대해서도 서술하였다.

• Journal of Radiation Protection and Research
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• 제41권4호
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• pp.384-388
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• 2016

Background: For a verification of newly-developed neutron absorbers, one of guidelines on the qualification and acceptance of neutron absorbers is the neutron attenuation test. However, this approach can cause a problem for the qualifications that it cannot distinguish how the neutron attenuates from materials. Materials and Methods: In this study, an estimation method of neutron absorption performances for materials is proposed to detect both direct penetration and back-scattering neutrons. For the verification of the proposed method, MCNP simulations with the experimental system designed in this study were pursued using the polyethylene, iron, normal glass and the vitrified form. Results and Discussion: The results show that it can easily test neutron absorption ability using single absorber model. Also, from simulation results of single absorber and double absorbers model, it is verified that the proposed method can evaluate not only the direct thermal neutrons passing through materials, but also the scattered neutrons reflected to the materials. Therefore, the neutron absorption performances can be accurately estimated using the proposed method comparing with the conventional neutron attenuation test. Conclusion: It is expected that the proposed method can contribute to increase the reliability of the performance of neutron absorbers.

• 한국항해항만학회지
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• 제36권3호
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• pp.189-196
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• 2012

최근의 몇몇 사례를 통해 국내에서도 플로팅 건축물의 확산 가능성에 대한 논의가 시작되고 있으나 국내에서는 아직 플로팅 건축계획과 관련되어 참고할 만한 가이드라인이나 규정이 제정된 바가 없다. 이 연구는 플로팅 건축물 상부시설에 대한 계획 지침을 구성하는 것을 목표로 하였다. 기존 국내외 지침 중 플로팅 건축물 상부시설 계획에 참조가 될 수 있는 지침을 선택하고 관련 구성 항목 및 구성 체계에 대하여 분석하였다. 이를 통해 이 연구와 직접적으로 연관된 지침 구성 항목을 추출할 수 있었다. 이렇게 추출된 항목을 유사한 내용을 중심으로 분류하여 몇 가지의 범주로 구분하고 각각의 내용을 비교 분석하였다. 이상과 같이 분석된 지침 구성 항목과 체계, 그 내용을 토대로 플로팅 건축물 상부시설에 대한 계획 지침 구성 체계를 제안하였고, 구성 항목 및 주된 규정 내용을 검토하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2008년도 하계학술대회 논문집 Vol.9
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• pp.297-297
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• 2008

Buffer layers play an important role in the development of high critical current density coated conductor. $LaMnO_3$, $SrTiO_3$ and $BaZrO_3$ buffer layers were compatible with MgO surfaces and also provide a good template for growing high current density REBCO(RE=Rare earth) films. Systematic studies on the influences of pulsed laser deposition parameters (deposition temperature, deposition pressure, processing gas, laser energy density, etc.) on microstructure and texture properties of $LaMnO_3$, $SrTiO_3$ and $BaZrO_3$ films as buffer layer deposited on ion-beam assisted deposition MgO (IBAD_MgO) template by pulse laser deposition method, were carried out. These results will be presented together with the discussion on the possible use of this material in HTS coated conductor as buffer.