• Journal of Electrochemical Science and Technology
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• v.11 no.1
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• pp.33-40
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• 2020

We present a new and facile design of a high-performance Li-S cell by integrating a Li₂S-impregnated glass fiber separator together with a common sulfur cathode. We find that a considerable amount of Li₂S is consumed amidst the first charge, and most of Li₂S disappears at the end of the second charge. During the charge process, additional sulfur material is formed and contributes to a significant enhancement of the discharge capacity (~1400 mAh/g), compared with a control cell (~1260 mAh/g) without Li₂S. Moreover, the Li₂S containing cell exhibits much higher cycling stability (a 31% increase from ~840 to ~1100 mAh/g in the 100th cycle) and rate capability (a 30% increase from ~580 to ~750 mAh/g at 2 C) than the control cell. Our results indicate that adopting Li₂S-containing separator is highly effective to improving the electrochemical performances of Li-S cells.

• The Korean Journal of Emergency Medical Services
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• v.20 no.3
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• pp.37-47
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• 2016

Purpose: The purpose of the study was to establish an education curriculum subject program design for the department of emergency medical technology based on National Competency Standards (NCS) key competencies. Methods: A self-reported questionnaire was completed by 180 level 1 emergency medical technicians in K area from June 15 to 20, 2016. Except for 14 incomplete questionnaires, 141 data were analyzed. The study instrument included general characteristics of the subjects (7 items) and importance and satisfaction levels for 10 key competencies including 34 items of subfactors by a Likert 5-point scale using Borich Needs Assessment Model. A locus for focus model (LF model) was used to derive the top priority key competencies for the education curriculum. Data were analyzed by SPSS v. 20.0. Results: The order of education needs of the program included interpersonal competency (1.442), communication competency (1.384), problem solving competency (1.185) and professional ethics competency (1.149). In the LF model, the required jey competencies included interpersonal competency, communication competency, professional ethics competency, and problem solving competency. Conclusion: The study results coincided with standard education curriculum guidelines. Our resluts can provide a valid reference for the department of emergency medical technology.

• Research in Mathematical Education
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• v.14 no.3
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• pp.219-231
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• 2010

Mathematically, a proof is to create a convincing argument through logical reasoning towards a given proposition or a given statement. Mathematics educators have been working diligently to create environments that will assist students to perform proofs. One of such environments is the use of dynamic-geometry-software in the classroom. This paper reports on a case study and intends to probe into students' own thinking, patterns they used in completing certain tasks, and the extent to which they have utilized technology. Their tasks were to explore the shape-to-shape, shape-to-part, and part-to-part interrelationships of geometric objects when dealing with certain geometric problem-solving situations utilizing dissection-motion-operation (DMO).

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.8 no.2
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• pp.163-168
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• 2015

The conventional simple-injection and unilateral-learning methods have the great disadvantages in special education outcomes for intellectual disabilities student. In this paper, we propose a digital micro-mirror system that learners themselves can manipulate the contents by using the various technology on user-interaction and augmented reality. Through the verification tests conducted by special education professionals, it is confirmed that the proposed commercial system can be used as a useful system in the special learning fields requiring high immersion.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.1856-1857
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• 2007

본 논문에서는 증강현실을 이용한 조립교육 트레이닝 방법을 제안하였다. 제안된 조립교육 방법이 기존의 문자나 그림을 이용한 조립교육 방법과 비교하여 사용자 (교육자)에게 얼마나 효과적인지를 실제 조립교육 실험을 통하여 검토되었다. 일반 PC 조립교육에 대한 비교 결과, 문자/이미지에 기초한 2D 형식의 기존 방법 보다 제안된 본 연구 방법이 조립시간을 단축시킴으로써, 결과적으로 조립교육 효과에 긍정적임을 확인할 수 있었다.

• Journal of Electrochemical Science and Technology
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• v.15 no.1
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• pp.198-206
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• 2024

Given the high theoretical capacity (1,675 mAh g^-1) and the inherent affordability and ubiquity of elemental sulfur, it stands out as a prominent cathode material for advanced lithium metal batteries. Traditionally, sulfur was sequestered within conductive porous carbons, rooted in the understanding that their inherent conductivity could offset sulfur's non-conductive nature. This study, however, pivots toward a transformative approach by utilizing diatom shell (DS, diatomite)-a naturally abundant and economically viable siliceous mineral-as a sulfur host. This approach enabled the development of a sulfurlayered diatomite/S composite (DS/S) for cathodic applications. Even in the face of the insulating nature of both diatomite and sulfur, the DS/S composite displayed vigorous participation in the electrochemical conversion process. Furthermore, this composite substantially curbed the loss of soluble polysulfides and minimized structural wear during cycling. As a testament to its efficacy, our Li-S battery, integrating this composite, exhibited an excellent cycling performance: a specific capacity of 732 mAh g^-1 after 100 cycles and a robust 77% capacity retention. These findings challenge the erstwhile conviction of requiring a conductive host for sulfur. Owing to diatomite's hierarchical porous architecture, eco-friendliness, and accessibility, the DS/S electrode boasts optimal sulfur utilization, elevated specific capacity, enhanced rate capabilities at intensified C rates, and steadfast cycling stability that underscore its vast commercial promise.

• International Journal of Knowledge Content Development & Technology
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• v.6 no.2
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• pp.109-147
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• 2016

This study comprehensively analyzed domestic and foreign literature related to the value and impact of libraries on education, social behavior and economic conditions, developed a survey to investigate the librarians' perception of the libraries' value and impact, and accordingly investigated the perception of librarians according to the types of libraries in which they worked, public versus university. The results showed that the impact is greatest on education and literacy with a mean score of 3.98, followed by their social impact with 3.67 and their economic impact with 3.46. When subordinate items were analyzed it was found that the librarians perceived that the role that libraries are playing in the education area is expanding and their impact on reading and literacy is becoming greater and greater. Libraries were viewed as essential elements for education and the education system. When the difference in perception related to the impact of libraries was compared by types of libraries, the librarians in public libraries tended to rate their facilities higher than the librarians working in universities on most of the items.

• Journal of Fashion Business
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• v.4 no.1
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• pp.87-96
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• 2000

Merchandiser continue to play an important role in the exchange process by providing products for consumption. Merchandisers must still understand customer demands, analyze sale trends, select and present salable products. However, due to the competitive pressures in the apparel industry and the innovations required under QR business systems, the demands placed on merchandisers are changing. The purpose of this study is to present of the direction for fashion merchandising education. The direction for fashion merchandising are education summarized as follows; 1) Merchandising technology is the systematic application of information technology and Telecomunications to planning, developing, and presenting product lines in ways that reflect social and cultural value. Statistic Methods are developed and used to analyze data arising from a wide variety of applications. 2) Merchandising technology is to practise the technical and economic aspects of apparel production. Analysis of specific apparel manufacturing and management issues such as efficient manufacturing methods. 3) Merchandising technology is to forecast fashion trend according to consumer preference. Culture influences what people purchase and how those items are used forecasting fashion trend. 4) Merchandising technology is to practise communication skills used in formal and informal organization including interviews in particular language suited to their own business and professionnal careers. 5) Merchandising technology is to planning merchandise budgets and merchandise assortments based on more diverse forms of information. 6) Merchandising technology is to use techniques related hardware and software. 7) Merchandising technology is to learn participate in internship programs.

• Journal of Electrical Engineering and Technology
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• v.10 no.2
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• pp.699-707
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• 2015

Although digit character recognition has got a significant improvement in recent years, it is still challenging to achieve satisfied result if the data contains an amount of distracting factors. This paper proposes a novel digit character recognition approach using a multi-layer hierarchical model, Hybrid Restricted Boltzmann Machines (HRBMs), which allows the learning architecture to be robust to background distracting factors. The insight behind the proposed model is that useful high-level features appear more frequently than distracting factors during learning, thus the high-level features can be decompose into hybrid hierarchical structures by using only small label information. In order to extract robust and compact features, a stochastic 0-1 layer is employed, which enables the model's hidden nodes to independently capture the useful character features during training. Experiments on the variations of Mixed National Institute of Standards and Technology (MNIST) dataset show that improvements of the multi-layer hierarchical model can be achieved by the proposed method. Finally, the paper shows the proposed technique which is used in a real-world application, where it is able to identify digit characters under various complex background images.

• Journal of The Korean Association of Information Education
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• v.9 no.2
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• pp.271-280
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• 2005

For successful accomplishment of ICT application in education that has been carried out in elementary schools, comprehensive supports to the essential factors, that are related systematically, in education such as curriculum, educational environment, and teachers are necessary. With this idea in mind, the purpose of this work is to analyze barriers to ICT application in education and propose desirable improvement plans for activating ICT application in education for elementary schools. For this purpose, in this work, we first conduct an extensive survey. In order to get the extensive survey results, three points of view, that is, curriculum, educational environment, and teachers are considered. Based on the survey results, we present the current status and activation plans of ICT application in education for each point of view.