• The Journal of the Acoustical Society of Korea
• /
• v.26 no.7
• /
• pp.323-327
• /
• 2007

In this paper, objectively quantified consonance of complex sound is proposed as a new psychoacoustical parameter. Proposing algorithm quantifies consonance of complex sound after applying psycho acoustical models which are parts of human perception such as masking effect, equal loudness contour, and critical band. To verify proposing algorithm, experiments with 10 car horn signals which have different complex sound were performed. The experiments show cross correlation of 0.95 between objectively quantified consonance by proposing algorithm and subjectively assessed consonance by listening tests. Considering the fact that there are few psychoacoustical parameter except Zwicker parameter, proposing algorithm will help to quantify psychoacoustical effect of complex sounds objectively.

• Journal of Korean Tunnelling and Underground Space Association
• /
• v.5 no.3
• /
• pp.279-289
• /
• 2003

In karst formation area, the tunnel support system is an important factor for the tunnel safety during operation. It is also not easy to determine the tunnel supporting system in the design stage. Therefore, it is necessary to standardize the tunnel supporting system in uncertain ground condition. This paper presents the standardization of the tunnel supporting systems to be adopt in karst formation. For the tunnel planned in the project area, karst features and the expected scenarios in the tunnel area were developed based on the results of the geological and geotechnical assessment. In order to provide specific supporting system and construction details for a wide range of possible karst features, the generalized typical support systems are developed according to the classification of karst features. In addition, the initial support systems and construction sequence for each karst feature are also presented in this paper.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2007.04a
• /
• pp.309-312
• /
• 2007

The cryogenic fluid is the propellant for the liquid rocket engine. The design of space launcher vehicle is guided by minimum size and weight criteria, so the turbo pump solicits high impeller speed. Such high speed results in a zone of pressure drop below vapor pressure causing caivtation around inducer blades. The cryogenic fluid has different characters from isothermal fluid like water. The cryogenic fluid has very sensible thermodynamic properties and the phase change undergoes evaporative cooling. So, the developed code has to be modified cavitation modeling and it is added the energy equation for temperature sensitivity.

• The Journal of the Korea Contents Association
• /
• v.21 no.4
• /
• pp.393-403
• /
• 2021

Recently, there is becoming larger interest in the public practice centers equipped with advanced manufacturing equipment of industries that is difficult to have in all vocational high schools for strengthening practical education and technical education tailored to the Fourth Industrial Revolution in vocational high schools. In this study, using spatial optimization approaches, we explored the optimal location sets of the public practice centers of vocational high schools in Seoul for an illustration. For the proposed optimial location methods, P-median Problem (PMP) and Maximal Coverage Location (MCLP) were used because, when the public practice centers located in priority of large vocational high schools based on the number of students, it showed that the result is not minimizing the travel distance and maximizing the demand of the vocational high school students. This study found that the PMP can find the optimal location sets that minimize the travel distance of whole students. In addition, all students can be captured through locating five public practice centers by MCLP. It should be noted that the optimal locations of this study are limited in Seoul. However, the frame of this methodology applied in this study can be utilized to locate the public practice centers in other regions based on the spatial decision making.

• Journal of Gifted/Talented Education
• /
• v.26 no.2
• /
• pp.405-421
• /
• 2016

The purpose of this study was to investigate students' perception of Advanced Placement Program. Participations of this study were 1144 students from 14 science high schools. The results showed as follows. First, students perceived positively regarding AP program and were willing to take AP courses because of interesting and challenging in academic area which is provided by AP courses. Secondly, many students would like to take AP courses in Differential and Integral Calculus 1, General Physics I, General Chemistry I and General Biology. Also, they would like to take AP courses in first term as a mandatory subjects. Third, responses perceived that AP courses were challenging, difficult, and of high quality. Finally, students perceived the benefit of AP courses in earing college credit. However, 35% of responses wished to receive an exemption for all AP courses. Also, they wished to have dual-major or participate in students exchange program as a benefit of AP program. Implications of the study were discussed in depth based on the results.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
• /
• 2010.09a
• /
• pp.379-383
• /
• 2010

본 논문은 현재 공동주택에서는 주소를 표기할 때 지번 뒤에 상세주소를 표기하여 단지 내에서 개별적으로 일관성 없는 세부주소로 사용하고 있는 문제점을 보완하기 위해 상세주소 표기 표준화 모형을 제시하였다. 공동주택별로 그 표기방식이 다양해 같은 동을 가동, 101동, 1동, A동, 에이동 등으로 사용하고 있었으며, 같은 층, 호를 지하1층, 지1호, 비01호, B01호,B1호, 1호, F02호 등과 같이 다양하게 표기하는 등, 비정형화로 인한 문제점이 제기 되고 있다. 비정형화로 인한 위치검색 및 위치파악 등의 애로사항으로 행정업무의 자료호환 등의 문제점이 발생하고 있어 표준화된 모형개발이 현실적으로 요구됨에 따라 본 연구에서는 공동주택인 아파트, 연립주택, 다세대주택을 중심으로 상세주소 표기 건축물에 대한 전문가 설문조사를 실시하여 상세주소의 표기방식에 대한 표준화 모형을 개발하였다.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2002.05a
• /
• pp.830-834
• /
• 2002

정보화의 진전에 따라, 국가 경영의 정보시스템 의존도는 심화되고 있으나, 현재까지 공공부문의 재해 재난 대비는 미흡한 상태이다. 따라서, 본 연구에서는 국가기간정보시스템의 생존성 확보를 위한 원격지 이중화 백업센터의 구축 방안을 고려한다. 서비스 중단시의 손실을 고려하여 우선백업대상시스템을 선정하였으며, 백업센터의 구성 및 형태, 위치 등의 고려요소를 파악하였으며, 확장성과 비용 효율성을 감안하여 공동백업센터 형태로 구성하는 방안을 제시하였다. 본 연구에서 제시한 국가기간정보시스템 공동백업센터의 구축은, 국가경영의 연속성 확보는 물론, 향후 공공부문의 전문적 전산운영기반 확충의 계기가 될 것으로 기대된다.

• Proceedings of the KIEE Conference
• /
• 2001.07b
• /
• pp.1242-1244
• /
• 2001

전철화 선로에 있어서 공동 접지 방식은 Staff 안전과 선로변 전기 설비에 가장 큰 영향을 인가하는 귀선 전류에 따른 문제점을 해결할 수 있는 최상의 방식으로 평가되고 있으며, 이들 접지 시스템의 구성은 기존의 전력 공급 시스템에 기본을 두고, 전철화에 따라 선택된 궤도 회로의 특성에 의해 모든 설계 변수가 변화되는 원리가 적용된다. 본 논문에서는 이러한 견지에 입각하여 궤도 회로에 의한 공동 접지망 구성 요소를 프랑스 철도청(SNCF)의 규정에 의해 분석한 후, 이를 경부선 전철화 구간에 적용하여 관련 설계 변수를 결정하였다.

• 주택과사람들
• /
• s.210
• /
• pp.38-41
• /
• 2007

민간 택지 개발 활성화 차원에서 최근 시행에 들어간 민간.공공 아파트 공동 택지 개발 사업 제도가 별다른 호응을 얻지 못하고 있다. 건설사들이 임대 의무화와 복잡한 절차 등의 문제 때문에 사업을 기피하고 있기 때문이다. 그 개선 방안에 대해 알아본다.

• The Journal of the Korea Contents Association
• /
• v.13 no.6
• /
• pp.507-517
• /
• 2013

Welfare desire has been diversified according to the increase of economic level and rapid social change. The desire for comprehensive service on culture, medical, mental and information level has appeared. Accordingly, it is necessary to establish an integrated community mixed-support facility, a space of accepting administration, welfare, leisure, culture and informatization request in a small local community in the future. The community mixed-support facility is a meeting place of local resident for information change, various basic service and ultimately for activation of community in order to contribute to regeneration and activation of existing urban core. Thus, this study figured out general status of community mixed-support facility and physical mixed type and analyzed spatial characteristics. Current community mixed-support facility has insufficient program and space to participate in by local residents and to accommodate mixed function. The future planned community mixed-support facility must secure multiple opportunities for various types of life by returning time and cost to user through the introduction of creative mixed concept. While reflecting unique local characteristics, and considering diversity of users, it needs to make mixed facility to cope with social changes. This study is limited in that the study reached a conclusion by survey and analysis only. However, it is expected that the result can be used as basic research data for the planning of community mixed-support facility to cope with living conditions of local residents or realistic requirements.