• 한국문헌정보학회지
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• 제54권2호
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• pp.105-125
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• 2020

본 연구는 2018년 전국도서관통계를 활용하여 공공도서관 방문자수 및 자료실이용자수에 미치는 영향요인을 log-log 중회귀모형으로 분석했다. 분석 결과를 요약하면 다음과 같다. 과거, '지식과 정보의 저장 및 전파'가 공공도서관의 주된 기능이던 시대에 이용자 유치에 가장 중요했을 것으로 생각되는 장서수나 좌석수 등의 요소를 넘어 현재는 문화 혹은 평생교육 프로그램, 도서관 운영, 이용자활동 등의 차원에서 매우 다양하고 복합적인 요소들이 방문자 및 자료실이용자 유인에 영향을 주고 있다. 이는 이제 도서관은 책이나 자료, 시설 등의 하드웨어적 요소보다는 문화 프로그램, 이용자 교육, 행사, 예산, 회원수, 개관시간, 건물의 스타일과 노후도, 동아리활동 등의 소프트웨어적 요소에 이끌려 찾아가는 종합문화센터가 되고 있다는 것을 뜻한다.

• Smart Structures and Systems
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• 제16권3호
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• pp.415-433
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• 2015

Tendon failures in bonded post-tensioned bridges over the last two decades have motivated ongoing investigations on various aspects of unbonded tendons and their monitoring methods. Recent research shows that change of strain distribution in anchor heads can be useful in detecting wire breakage in unbonded construction. Based on this strain variation, this paper develops a damage detection model that enables an automated tendon monitoring system to identify and locate wire breaks. The first part of this paper presents an experimental program conducted to study the strain variation in anchor heads by generating wire breaks using a mechanical device. The program comprised three sets of tests with fully populated 19-strand anchor head and evaluated the levels of strain variation with number of wire breaks in different strands. The sensitivity of strain variation with wire breaks in circumferential and radial directions of anchor head in addition to the axial direction (parallel to the strand) were investigated and the measured axial strains were found to be the most sensitive. The second part of the paper focuses on formulating the wire breakage detection framework. A finite element model of the anchorage assembly was created to demonstrate the algorithm as well as to investigate the asymmetric strain distribution observed in experimental results. In addition, as almost inevitably encountered during tendon stressing, the effects of differential wedge seating on the proposed model have been analyzed. A sensitivity analysis has been performed at the end to assess the robustness of the model with random measurement errors.

• 자동차안전학회지
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• 제8권3호
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• pp.10-15
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• 2016

The purpose of this study is to evaluate the injury mechanism of facial injury related to an air-bag's deployment in occupant motor vehicle accident (MVA) by using Hospital Information System (HIS) and reconstruction program, based on the materials related to motor vehicle accidents. Among patients who visited the emergency department of Wonju Severance Christian Hospital due to motor vehicle accidents from August 2012 to February 2014, we collected data on patients with agreement for taking the damaged vehicle's photos. After obtaining the verbal consent from the patient, we asked about the cause of the accident, information on vehicle involved in the accident, and the location of car repair shop. The photos of the damaged vehicle were taken on the basis of front, rear, left side and right side. Damage to the vehicle was presented using the CDC code by analytical study of photo-images of the damaged vehicle, and a trauma score was used for medical examination of the severity of the patient's injury. Among the 309 patients with agreement for an investigation, thirty five (11.3 %) were the severe who had ISS over 15. And also, sixteen (5.2%) derived from the reconstructed data (maximum collision energy, maximum acceleration, delta V) by PC-Crash. As a result, ISS including the facial injuries was affected by the condition. It was high when the number of crash extent, the safety belt was not fastened, and the seating position of occupant and the direction of collision is same. For accurate analysis of the relationship between occupant injury and vehicle damage in MVAs, build-up of an in-depth database through carrying out various policies for motor vehicle accidents is necessary for sure.

• 한국콘텐츠학회논문지
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• 제18권1호
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• pp.587-595
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• 2018

본 연구는 멀티플렉스 영화관 관람객을 대상으로 영화관 선택속성에 대한 중요도 및 성취도를 분석해 보고자 하였다. 이에 멀티플렉스 영화관을 방문하여 영화를 관람하고자 하는 관람객을 대상으로 자료를 수집하여 대응표본 T-test를 실시하였으며 유의한 차이가 있는 속성과 각 선택 속성들 간의 순위를 살펴보았다. 또한 요인분석을 통하여 주요서비스, 인적서비스, 물리적 환경, 보조서비스의 4가지 하위요인을 도출하였으며, IPA(Importance-Performance Analysis)기법을 이용하여 집중 영역, 유지 영역, 저순위 영역, 과잉노력 지양 영역의 항목들을 도출하였다. 분석결과는 아래와 같다. 제 I사분면은 노력집중영역은 상영시간대의 다양성, 상영영화장르의 다양성, 모바일 앱 이용의 편리성, 주차시설의 규모와 편리성으로 나타났다. 제 II사분면인 지속유지 영역은 웹사이트 예매의 편리성, 카드제휴를 통한 할인혜택, 직원의 친절성, 직원의 정확한 서비스 정보전달, 편안한 좌석, 스크린 크기, 영화관 사운드 품질, 주변 환경과의 연계성, 대중교통의 편리성 등으로 나타났다. 제 III사분면인 저순위 영역은 멤버십제도, 직원복장의 단정함, 대기시간을 위한 휴식 공간, 주변접근성, 스넥코너의 다양성, 전반적 청결도로 나타났다. 제 IV사분면은 과잉노력 지양 영역으로 상영관 온도의 적정성과 서비스 숙련도로 나타났다.

• 산업경영시스템학회지
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• 제41권3호
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• pp.108-114
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• 2018

One of the most performed action in daily life is standing up from sitting position. As the population of the world is aging at the high rates, people may face problems with reduced muscle strength as well as psychological changes. This can lead elderly people having difficulties with standing up from chair. Now, with the aging trend worldwide, products are being developed that can support the lives of the elderly. This study examines the distribution of hip pressure in relation to the seating positions of the standing assistance seats under development to prevent standing up accidents in older adults. The currently developing standing assistant chair designed to tilt to a maximum angle of 25 degrees. At over $25^{\circ}$, design considers that older people are at risk of thrown back out of that force and that the forces exerted on their arms and legs can be a significant burden to older people. By considering danger of higher than $25^{\circ}$ for older people which is experimented in the basis of static capturing approach in previous papers, it is experimented people with age group of 20~60 on $0^{\circ}$ to $25^{\circ}$ tilting angle on the basis of dynamic capturing method in order to pick convenient angle of inclination. Moreover, tried to find the optimum angle by comparing the hip pressure distribution when seated at the edge of the seat and at the center of the seat with the pressure distribution sensor.

• 대한치과보철학회지
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• 제39권3호
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• pp.297-305
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• 2001

Statement of problem. There have been previous studies about instability according to screw material by means of calculating preload in tightening screw or recording of the torque necessary to loosen screw after tightening screw. Purpose. The purpose of this study was to evaluate screw joint stability through the analysis of fitness at the mating thread surfaces between implant and screw after tightening screws made of different materials. Material and methods. In this study, screws were respectively used to secure a cemented abutment to a hexlock implant fixture; teflon coated titanium alloy screw and titanium alloy screw(Steri-Oss), gold-plated gold-palladium alloy screw and titanium alloy screw(Implant Innovation), gold screw and titanium screw(AVANA Dental Implant System). Each abutment screw was secured to the implant with recommended torque value using a digital torque controller. Each screw was again tightened after 10minutes. All samples were cross sectioned with sandpaper and polished. Then samples were evaluated with an scanning electron microscope analysis. Results. In titanium alloy screw, irregular contact and relatively large gap was present at mating thread surface. Also in teflon-coated titanium screw, incomplete seating and only partially contact was present at the mating thread surface. In gold-plated gold-palladium alloy screw, relatively close and tight contact without the presence of large gap was present by existing of gold coating at the mating thread surfaces. In gold alloy screw, relatively small gap between the mating components was seen. Conclusions. This result suggested that gold plated gold-palladium alloy screw and gold alloy screw achieved a greater degree of contact at the mating thread surfaces compared to titanium alloy screw and teflon-coated titanium alloy screw.

• 한국조경학회지
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• 제30권3호
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• pp.57-63
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• 2002

This landscape design was proposed for the Buchon Special School Competition, held by the Kyonggi Province Office of Education. The authors collaborated on this design and won first prize in November of 2001. In the design proposal, on the basis of the knowledge of; mentally retarded children the children's activities, nature and health, and the healing gardens, the special school outdoor spaces were designed to meet the particular needs of the users. The school outdoor spaces are design for various types of users-children, adolescents, parents, siblings, staff, volunteers and visitors. The following are some of the basis concerns in the design of the school outdoor spaces : garden site planning, garden location, security, microclimate, entering and exiting, accessibility, usability, user group territories, supervision, attracting trained volunteers, a range of high-quality social settings, accommodation of different student types, accommodation of needs for both challenge and rest, child nature interaction, diversity of natural settings, hands-on activity, integrating the arts, and maintenance. The following are some of the major features in the design of school outdoor spaces : pleasant and inviting entry areas, sports grounds with different levels of challenge, gardens with plants having strong fragrances and/or tactile qualities, resting places with many types and forms of seating and weather-mitigating features, play grounds for all student types, roof gardens for users to experience nature in man-made environments, and walkways and winding paths with various trees, shrubs and flowers. In the special school outdoor spaces, people would perceive a unique sense of place through the various types of spaces and features described above. An example of the true meaning of a playing and resting place and a restorative and therapeutic environment is provided in the school outdoor spaces.

• 한국콘텐츠학회논문지
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• 제8권2호
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• pp.164-172
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• 2008

본 연구는 승객들이 인식하는 항공사 서비스 품질에 대한 중요도와 만족도가 어떠한 차이가 있는지를 분석하고 이를 통해 궁극적으로 항공사의 서비스 품질 개선을 위한 기초자료로 활용할 목적으로 수행되었다. 항공사 서비스 품질에 대한 중요도와 만족도를 알아보기 위해 중요도-만족도 분석(Importance-performance analysis: IPA)을 이용하였고, 분석결과 한국 국제선 승객이 인지하고 있는 항공사 서비스 품질에 대한 중요도와 만족도는 차이가 있는 것으로 나타났다. 특히 IPA 결과 한국을 운항하는 항공사들이 무엇보다도 개선을 위한 집중적인 노력을 기울여야 하는 서비스 요인인 승객들이 중요하게 여기고 있지만 실제로 만족하지 못하는 서비스 요인은 '기내식', '좌석의 안락감', '좌석의 폭과 다리를 뻗는 공간', '탑승수속 서비스'인 것으로 분석되었다. 본 연구의 IPA결과를 토대로 항공사들은 강점과 약점을 파악하고 이를 통해 궁극적으로 항공사의 수익을 극대화 할 수 있는 방안을 세워야 할 것이다.

• Coupled systems mechanics
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• 제4권4호
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• pp.297-316
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• 2015

The use of fragility curves in the design of bridges is becoming common these days. In this study, experimental data have been used to develop fragility curves for the potential of girder unseating of a three-segment bridge and a bridge-abutment system including the influence of spatially varying ground motions, pounding, and abutment movement. The ground excitations were simulated based on the design spectra for different soil conditions. The Newmarket Viaduct replacement bridge in Auckland was used as the prototype bridge. These fragility curves were also applied to the 2010 Darfield and 2011 Christchurch earthquakes. The study showed that for bridges with similar characteristics as the chosen prototype and with similar fundamental frequencies, pounding could increase the probability of girder unseating by up to 35% and 30% based on the AASHTO and NZTA seating length requirements, respectively. The assumption of uniform ground excitations in many design practices, such as the NZTA requirements, could potentially be disastrous as girders might have a very good chance of unseating (as much as 53% higher chances when considering spatial variation of ground motions) even when they are designed not to. In the case of superstructures with dissimilar frequencies, the assumption of fixed abutments could significantly overestimate the girder unseating potential when pounding was ignored and underestimate the chances when pounding was considered. Bridges subjected to spatially varying ground excitations simulated based on the New Zealand design spectra for soft soil conditions with weak correlation shows the highest chances of girders falling off, of up to 65% greater than for shallow soil excitations.

• 한국전자통신학회논문지
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• 제16권5호
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• pp.909-916
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• 2021

3D 프린터는 개인의 창의력을 실제로 구현할 수 있는 장점이 있다. 이 특성을 활용하려는 사람들은 증가하고 있지만 적합한 프린팅 교육의 기회 부족과 잘못된 출력 방법으로 문제 발생의 어려움을 겪는다. 따라서 저하된 출력물 품질이 사용자의 관심을 낮춰 점차 3D 프린터의 활용빈도 수를 감소시키게 된다. 본 연구에서는 3D 프린터의 오작동 해결과 편의성의 개선을 위해 직접 기기를 작동하면서 발생하는 문제를 파악하고 분석했다. 여러 문제점 중 안착 불량, 스트링 현상, 노즐 막힘을 중점으로 해결과 완화 연구를 진행하였다. 또한, 3D 프린터의 기능을 실험을 통해 재료소모량 감소와 출력시간 단축 방법을 고찰했다. 최종적으로 3D 프린팅 중 빈번하게 발생하는 출력문제를 해결해 외관이 온전한 출력물을 얻을 수 있었고 편의성을 개선하였다.