• 한국세라믹학회지
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• 제32권6호
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• pp.659-668
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• 1995

Zirconium carbide was prepared from the mixture of metal zirconium and carbon powders in argon atmosphere by Self-propagating High-temperature Synthesis (SHS) in order to obtain the best carbon source and dilution contents. The most exellent result was obtained in the case that active carbon was added as a starting material, 20~30 wt% dilution content. From thermal profile analysis an apparent activation energy of 118 KJ/mol was calculated. The maximum heating rate achieved during 15 wt% ZrC reaction by product dilution method was approximately 1.54$\times$105 K/s. Coupling this value with the measured wave velocity of 1.026cm/s yielded a maximum thermal gradient fo $1.5\times$105 K/cm. Using the definition of t* and the measured wave velocity, the effective thermal diffusivity, $\alpha$, was calculated to be 0.62$\times$102 $\textrm{cm}^2$/s.

• 한국초전도ㆍ저온공학회논문지
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• 제7권1호
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• pp.5-8
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• 2005

MOD Process using metal acetates or trifluoroacetates has been considered to be a strong candidate for a low cost fabrication process for coated conductor with high $J_e$. Recently, an economical MOI) process has been developed for coated conductor with high $J_c$ using low cost starting materials such as YBCO powders. YBCO thin films prepared by single coating on LAO substrate with this modified oxide-precursor solution gives transport $I_c$ of 100A/cm-w and the $J_c$ value of $2.9MA/cm^{2}$ (77K, Self-field). The YBCO coated conductor prepared by single coating with $CeO_2/IBAD-YSZ/SS$ tape gives transport $I_c$ of 50A/cm-w in 2cm. Characterization with XRD, SEM shows that the YBCO layers were epitaxially grown and exhibit well-developed dense micro-structures. This newly developed oxide-precursor based MOD process will provide a low cost route to coated conductor with high $J_c$.

• International Journal of Fluid Machinery and Systems
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• 제7권1호
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• pp.16-27
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• 2014

Double-blade vertical axis wind turbines (DB-VAWTs) can improve the self-starting performance of lift-driven VAWTs. We here propose the quadruple-multiple streamtube model (QMS), based on the blade element momentum (BEM) theory, for simulating DB-VAWT performance. Model validity is investigated by comparison to computational fluid dynamics (CFD) prediction for two kinds of two-dimensional DB-VAWT rotors for two rotor scales with three inner-outer radius ratios: 0.25, 0.5, and 0.75. The BEM-QMS model does not consider the effects of an inner rotor on the flow speed in the upwind half of the rotor, so we introduce a correction factor for this flow speed. The maximum power coefficient predicted by the modified BEM-QMS model for a DB-VAWT is thus closer to the CFD prediction.

• 성인간호학회지
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• 제24권2호
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• pp.149-159
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• 2012

Purpose: The purpose of this study was to understand the life of newly appointed professors of nursing by exploring the meaning and essence of their academic work and life experience. Methods: The participants consisted of 11 newly appointed female full-time professors with less than five years of experience who had been purposely sampled from three or four-year nursing colleges. Data were collected from October 2010 to December 2011 through the face-to-face interview and phone interview. Thematic analysis was conducted using hermeneutic phenomenological methodology. Results: The findings were classified into seven themes: 'Starting feeling hope and delight', 'putting sustained energy into lecturing and training', 'struggling in the tense atmosphere where assessments are often conducted', 'gaining courage in an associated relationship network', 'experiencing confusion of the identity as a professor', 'seeking compromise, handling their work and housework', and 'shedding new light on reality with self-awareness'. Conclusion: This study is significant in that it offered the foundation for the creation of human resources networks and mentoring programs that help newly appointed professors to effectively adjust to university society on the basis of the sympathetic understanding of and support for their life.

• 공학교육연구
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• 제23권2호
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• pp.43-48
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• 2020

This paper deals with a Capstone Design project which is a wearable haptic wrist massage device design carried out within the 'Designeer' education program. Following design thinking process is recommended throughout a year in order to ensure a desirable, feasible and viable product. Dealing with a real problem of the field requires open-minded and flexible attitudes both from students and professors. Integrating design in an engineering project does not mean always making better looking product. User experience design allows wider opportunity to engineers to deal with design. A case study of developing a wearable wrist massage device shown in this paper demonstrate haptic design and how haptic properties can be optimized to offer best user experience of hand massaging. This study identified that starting lateral pressure movements from the center in larger area using air tubes gives better feeling as self-massage using wrist wearing devices.

• 가정과삶의질연구
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• 제24권3호
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• pp.83-94
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• 2006

In order to understand how consumers' buying motivation is formed, that is the starting point of consumer behavior or consumers' decision-making processes, we examined how the interpersonal orientation for consumers is organized to control buying motivation and create a stepping-stone for subjects' behavior in fast varied consumer environments. In addition, we examined what influence this interpersonal orientation has on consumers' buying motivations. The results are shown as follows: First, interpersonal orientation is classified into six categories, according to Cohen's three types, i.e., compliance, detachment I: emotion independence, detachment II: performance independence, detachment III: perception independence, aggressiveness I: competitiveness, aggressiveness II: aggressiveness. Second, based on our inspection of the relation between interpersonal orientation and consumers' buying motivations, for external motivation and internal motivation, the value of R2 in regression seems too low to act as an influencing power on interpersonal orientation, while in case of introjected motivation, identified motivation I: self respect, and identified II: pursuit of harmony, I there seems to be some relationship.

• 동아시아식생활학회지
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• 제25권4호
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• pp.710-719
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• 2015

This study was undertaken to identify factors affecting school food waste generation using a questionnaire. The subjects were 254 high school students (male; 156, female; 98) in Sacheon, Gyeongnam divided into three groups of low (${\leq}1/week$), moderate (2~3/week), and high (${\geq}4/week$) according to the frequencies of food waste. The questionnaires consisted of general characteristics, anthropometric values, dietary habits, health-related behaviors, self-perceptions of food waste, snacking patterns, and nutrition knowledge. The main reasons behind food waste were 'too much food' in the low (20.9%) and moderate (32.2%) groups, and 'no appetite' in the high group (p<0.01). The main types of food waste were rice (44.2%) > fish (18.6%) > vegetables (14.0%) in the low group, rice (54.2%) > Kimchi/vegetables (15.3%) in the moderate group, rice (56.0%) > vegetables (20.0%) > Kimchi (16.0%) in the high group (p<0.01). School food waste was significantly affected by age, gender, monthly allowance, school grade, weight, BMI, regularity of meals, time of meals, type of breakfast, starting age of smoking, and cost for snacking.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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• pp.112-112
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• 2013

Well-defined surfaces of single-crystalline solid materials are starting points of self-organizationof nanostructures and chemical reactions controlled in nanoscale. Although highly ordered atomicarrangement can be obtained on semiconductor surfaces, they can be maintained only in vacuumand not in air or in aqueous environment. Since single-crystalline metal oxide surfaces arechemically stable and no further oxidation occurs, their atomic structures can be utilized fornanofabrication in liquid processes, nanoelectrochemistry and nanobiotechnology. Sapphire is oneof the most stable metal oxides and its crystalline quality is excellent, as can be applied to electronicdevices that require ultralow defect densities. We recently found that chemical phase separationoccurs on sapphire surfaces by annealing processes and the formed nanodomains exhibit specificproperties in air and in water [1,2]. In our experiments, highly selective and controllable adsorptionof various protein molecules is observed on the phase-separated surfaces though the materials andcrystallographic orientations are identical [3,4]. Planar lipid bilayers supported on thephase-separated sapphire surface also exhibit a specific formation site selectivity [5]. Chemicalnanodomains appear on other metal-oxide surfaces, such as well-ordered titania surfaces. Wedemonstrate that surface chemistry of the nanodomains can be characterized in aqueousenvironment using atomic force microscopy equipped with colloidal tips and then show adsorptionand desorption behaviors of various proteins on the phase-separated surfaces.

• Journal of Nuclear Fuel Cycle and Waste Technology
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• 제1권1호
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• pp.1-7
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• 2013

The safe management of radioactive waste is a national task required for sustainable generation of nuclear power and for energy self-reliance in Korea. Since the initial introduction of nuclear power to Korea in 1978, rapid growth in nuclear power has been achieved. This large nuclear power generation program has produced a significant amount of radioactive waste, both low- and intermediate-level waste (LILW) and spent nuclear fuel (SNF); and the amount of waste is steadily growing. For the management of LILW, the Wolsong LILW Disposal Center, which has a final waste disposal capacity of 800,000 drums, is under construction, and is expected to be completed by June 2014. Korean policy about how to manage the SNF has not yet been decided. In 2004, the Atomic Energy Commission decided that a national policy for SNF management should be established considering both technological development and public consensus. Currently, SNF is being stored at reactor sites under the responsibility of plant operator. The at-reactor SNF storage capacity will run out starting in 2024. In this paper, the fundamental principles and steps for implementation of a Korean policy for national radioactive waste management are introduced. Korean practices and prospects regarding radioactive waste management are also summarized, with a focus on strategy for policy-making on SNF management.

• 기본간호학회지
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• 제9권3호
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• pp.462-472
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• 2002

The purpose of this study was to describe the spiritual care experiences of student nurses after they have received 2 credits in a spiritual nursing care course at a university in Seoul, Korea. The major finding are as follow: 1 The problems that students reported for their patients were. loss of self- confidence, anxiety about outward appearance, anxiety about his(her) health and illness, maladaptability, guilt, problems with dating, uncertainty about his (her) future. 2. The methods which students used to help solve the patients' problems were: prayer with patients, use of Scripture, conversation, advice, frequent meetings listening, frequent phone call, writing letters, exploring problem solving methods together, and introduction of similar patients. 3. After the students had experienced spiritual nursing care they felt satis-faction, lack of knowledge of spiritual care, understood that spiritual nursing care courses at the university are important for education and experience, and understood the need for experience to increase sensitivity to the spiritual needs of their patients. Conclusion : Maintaining spiritual wellness is a important as maintaining physical fitness and essential for optimal well being. Therefore educating student nurses in developing and maintaining spiritual wellness is essential in order for them to help their patients achieve holism.