• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 3차
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• pp.125-128
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• 2010

A large quantity of purified water sludge is generated in modern cities around the world. Dewatering is essential to reduce the volumes transported off-site for disposal. Traditionally employed methods such as solar drying methods are time-consuming. There are urgent demands for developing alternatives to dewater the sludge in a less time-consuming manner. In this paper, siphon method is proposed to dewater the high-water-content sludge with plastic drainage plate installed horizontally. A group of comparative tests are conducted to preliminarily investigate the dewatering behavior of the purified water sludge with siphon and solar drying methods, respectively. On the basis of the test results, the availability and effectiveness of the new method is verified. It may provide an innovative solution to treat the purified water sludge more effectively.

• 한국도서관정보학회지
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• 제53권1호
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• pp.231-263
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• 2022

인공지능에 대한 이해 및 업무분야에서의 활용 능력은 지식 정보화 시대를 살아가는 모든 사람에게 기본 역량으로 강조되고 있으며, 이에 따라 인공지능에 대한 교육의 필요성은 대학 구성원들에게도 높게 인식되고 있다. 국내외 대학도서관 역시 효과적인 인공지능 콘텐츠 제공의 필요성을 인식하여 전자 형태의 디지털 콘텐츠를 제공하고 있으나, 인공지능이라는 정보 기술에 특화된 이용자 맞춤형 추천은 제공되고 있지 않고 있으며 이러한 추천서비스에 대한 이용자의 관심 파악 역시 미비하다. 대학생의 인공지능 교육에 대한 수요가 증가하고 있는 상황에서, 대학도서관에서의 인공지능 관련 콘텐츠 추천에 대한 이용자의 이용의사를 파악하고 효과적인 서비스 수립을 위한 조사가 절실히 필요한 시점이다. 본 연구는 확장된 기술수용모델을 활용하여 인공지능 주제 분야에 특화된 디지털 교육 콘텐츠를 추천해주는 서비스에 대한 이용자들의 사용의도에 영향을 주는 요인을 도출하였으며, 대학생을 대상으로 한 온라인 설문조사, 대학도서관 사서들과의 서면인터뷰를 통해 각 요인별 영향력을 조사하고, 성공적 수행을 위한 제언을 수렴하였다. 연구결과, 인공지능관련 교육콘텐츠 추천시스템 사용의도는 성별, 학년, 전공계열에 상관없이 사용의사가 있다고 조사되었고, 과제적합성요인이 사용의도에 가장 영향을 미치는 요인임이 파악되었다. 사서들 또한 서비스의 필요성을 깊이 공감하고 있었고 현실적인 제약사항으로 예산과 콘텐츠 품질 문제를 제시하였다.

• Earthquakes and Structures
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• 제16권4호
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• pp.415-423
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• 2019

Near-fault ground motions can impose particularly high seismic demands on structures due to the pulses that are typically observed in the velocity time-histories. In this study it is empirically found that the critical response can be estimated from the directions corresponding to the maximum (max) or minimum (min) pulse-energy. Determination of the pulse-energy requires removing of the high-frequency content. For achieving this, the wavelet analysis and the least-square-fitting (LSF) algorithm are adopted. Results obtained by the two strategies are compared and differences between them are analyzed. Finally, the relationship between the critical response and the response derived from directions having the max or min pulse-energy confirms that using the pulse-energy for deriving the critical response of the building structures is reasonable.

• 만화애니메이션 연구
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• 통권36호
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• pp.573-592
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• 2014

Following rapid development of software and hardware technologies and increasing enhancement in arithmetic capability, there are more and more content that can be accommodated and processed in video games, which is also increasingly complex and fine. Cutscene as a main narrative method have been developed, which have become necessary to express some key plots and important scenarios in games. Good cutscene can strengthen engagement of players with virtual world in games and make players share affection and sorrow with roles in games; while badly-designed cut-scene or overused cut-scene will impair immersion of players and affect players' gaming experience; for this reason, developers should not continue cut-scene design just from opinions of designers nor make players passive receivers, instead, they should reduce as much as possible interruption by cut-scene to players' immersion and grant players with better immersion. After all, only designs depending on demands and preferences of players by having some knowledge of impacts of cut-scene on players' immersion can be accepted by players.

• Agricultural and Biosystems Engineering
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• 제7권1호
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• pp.27-41
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• 2006

Assessment of nitrogen and chlorophyll content from crop leaves can help growers adjust N fertilizer rates to meet the demands of the crop. Numerous researchers have presented their studies about spectral signature of plant leaves to characterize the plant features. However, interrelational review and summary were limited and a communication gap exists between the plant science and optical engineering. Understanding the mechanism of leaf interaction to electromagnetic radiation and factors affecting spectrophotometric measurements can enhance the foundation of optical remote sensing technologies. This paper provides extensive review of previous works in optical sensing and explains the basics of plant optics, spectral measurements for plant stress, factors that affect sensitivity to spectral analysis, and applications that deploy optical remote sensing technologies.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2004년도 추계학술발표대회 논문집
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• pp.165-166
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• 2004

Apartment, which have become the major housing style in Korea, have contributed to the development of housing culture as well as achieved a growth in volume. However, the demands and characteristics of residents have not been reflected in the apartment, because it has been developed only for a growth in volume. In this society, housing unit was the first consideration rather than common space. Therefore, a required resident-centered common space is the domestic housing market's necessity. Under this circumstance, this study investigated previous studies on interior design guidelines for common space were analyzed using Murtha and Lee's user benefit criteria which emphasizes humanity. In-depth content analysis was employed in this study. The result showed that four categories of the model were related toward more user-centered residential environment-behavioral facilitation, physiological maintenance, perceptual maintenance, and social facilitation.

• Journal of Power Electronics
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• 제2권4호
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• pp.240-249
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• 2002

Power electronics Is an emerging technology New applications are added every year as well as the power handling capabilities are steadily increasing. The demands to the education of engineers in this field are also increasing. Basically the content of the curriculum should be more expanded without extra study time. This paper present a teaching approach which makes it possible very fast for the student to get in-deplh skills in this important area which is the problem-oriented and project-based learning. The trend and application of power electronics are illustrated. The necessary skills for power electronic engineers are outlined followed up by a discussion on how problem-oriented and project-based learning are implemented. A complete curriculum at Aalborg University is presented where different power electronics related projects at different study levels are carried out.

• 영어어문교육
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• 제9권spc호
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• pp.1-17
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• 2003

This paper aims to propose that Problem-Based Learning (PBL) is a method that can help meet the conditions in language learning and instruction. PBL was first used in medical education, where learners engaged in problem-solving activities that reflect the demands of real-life professional practice, thus promoting critical thinking in the content domain. The paper proposes that by applying PBL in language learning and creating situations in which learners work collaboratively on problems, the learners benefit in two respects: (i) they have the opportunity to practise the kind of thinking skills and problem-solving strategies needed in real life, and (ii) they engage in purposeful language activity with others through discussion and negotiation. The paper first provides a theoretical rationale far the use of PBL in language learning and suggests attendant changes in the role of a language instructor in a PBL context. The paper then presents an outline of the stages and components needed in designing an online PBL Unit far use in an undergraduate language class.

• 한국식품영양학회지
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• 제21권4호
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• pp.583-591
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• 2008

The principal objective of this study was to assess the demands of the development program of silver health care professionals for elderly individuals residing in the Northern Gyeonggi-do area. To this end, a survey was conducted to investigate college students and employees related with elderly individuals in the area regarding their recognition, interest, and involvement in the labor training program. In the case of college students, the health education they had received was only 1 to 2 hours, from a school lecture(35%). The content of health education they desired was exercise(34%) and stress management skills(28%). The sources of health information they received included mass media(77%) and the internet(12%), and they trusted the information they received from health professionals(45%), and the mass media(34%). In the case of health professionals who were working at silver care facilities, the sources of health information to which they had access were mass media(51%), internet(14%), reliable health professionals(56%), mass media(22%), and books related to health (18%). The principal issues they reported as being relevant to the elderly were dementia(39%), hypertension(14%), arthritis (11%), and they reported that the most important personnel for elderly in the future would be care managers(44%), and care helpers(21%). 88% of subjects believed that there was a need for a silver welfare integrated information system. 43% of subjects used the internet, 77% of them required in-service training programs for the welfare of the elderly. Via this developmental program of silver health care professionals, a variety of new job opportunities can be provided in the future, and a program related to the silver service industry must be established as soon as possible.

• 한국마이크로전자및패키징학회:학술대회논문집
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• 한국마이크로전자및패키징학회 2004년도 ISMP Pb-free solders and the PCB technologies related to Pb-free solders
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• pp.233-241
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• 2004

A new alloy definition will be presented concerning increasing demands for the board level reliability of miniaturized interconnections. The damage mechanism for LFBGA components on different board finishes is not quite understood. Further demands from mobile phones are the drop test, characterizing interface performance of different package constructions in relation to decreased pad constructions and therefore interfaces. The paper discusses the characterization of interfaces based on SnPb, SnPbXYZ, SnAgCu and SnAgCuInNd ball materials and SnAgCuInNd as solder paste, the stability after accelerated tests and the description of modified interfaces strictly related to the assembly conditions, dissolution behavior of finishes on board side and the influence of intermetallic formation. The type of intermetallic as well as the quantity of intermetallics are observed, primaliry the hardness, E modules describing the ability of strain/stress compensation. First results of board level reliability are presented after TCT-40/+150. Improvement steps from the ball formulation will be discussed in conjunction to the implementation of lead free materials In order to optimize ball materials for area array devices accelareted aging conditions like TCTs were used to analyze the board level reliability of different ball materials for BGA, LFBGA, CSP, Flip Chip. The paper outlines lead-free ball analysis in comparison to conventional solder balls for BGA and chip size packages. The important points of interest are the description of processability related to existing ball attach procedures, requirements of interconnection properties and the knowledge gained the board level reliability. Both are the primary acceptance criteria for implementation. Knowledge about melting characteristic, surface tension depend on temperature and organic vehicles, wetting behavior, electrical conductivity, thermal conductivity, specific heat, mechanical strength, creep and relaxation properties, interactions to preferred finishes (minor impurities), intermetallic growth, content of IMC, brittleness depend on solved elements/IMC, fatigue resistance, damage mechanism, affinity against oxygen, reduction potential, decontamination efforts, endo-/exothermic reactions, diffusion properties related to finishes or bare materials, isothermal fatigue, thermo-cyclic fatigue, corrosion properties, lifetime prediction based on board level results, compatibility with rework/repair solders, rework temperatures of modified solders (Impurities, change in the melting point or range), compatibility to components and laminates.