• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2000년도 춘계학술대회논문집
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• pp.371-379
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• 2000

A noise prediction method of axial flow fan is developed by incorporating through-flow method and vortex shedding noise model. Fan noise is assumed to be generated due to the pressure fluctuation induced by wake vortices of fan blades and radiate as diploe distribution. The wake vortices are analyzed by combining Karman vortex street model and through-flow analysis results, and the vortex-induced fluctuating pressure on blade surface is calculated by thin airfoil theory. The predicted sound pressure levels and directivity patterns of fan noise by the present method are favorably compared with fan noise test data. Furthermore, the present method is shown to be very useful for predicting the aero-acoustic performance map of the fan operated at off-design point.

• 한국농촌건축학회논문집
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• 제9권1호
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• pp.27-34
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• 2007

This study is to propose directions of waterfront planning about fishing village and harbor in East coast. Above all important waterfront-using in harbor, such as regional atmosphere and sea-scape are to investigate waterfront elements. For example, seaside park, harbor street mall, landmark, view point, promenade can be checked and design of waterfront may be possible to work out future harbor master plan. This study suggests that harbor of contemporary is to develop by regional waterfront characters. Accordingly, we analyze, it shows that the waterfront planning not only people of village but also visiting citizen is one of the important in developments about fishing village and harbor. As a results of this paper, we expect this research to be used as a valuable data in waterfront planning about fishing village and harbor.

• 한국주거학회:학술대회논문집
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• 한국주거학회 2002년도 추계학술발표대회
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• pp.229-233
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• 2002

Considering the present outdoor environment of city landscapes, the improvement of well-formed street landscapes is very important issue in Korea. At this point of time, it is very meaningful to understand the outdoor advertising design and the planning condition of buildings and examine various problems about this and the possibilities for improvement. Thus the purpose of this study is to accumulate basic data to establish design guideline and visual factors for the outdoor advertising for useful environment. The conclusions of this study are as follows: outdoor advertising design is powerful design tools as identified to city landscape. Planning factors for outdoor advertising design should be developed systematically and more fit to the street environment and designers in the aspect of control and guidance.

• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 1999년도 국제컨퍼런스 디지털컨텐츠 활용을 통한 지식경영의 확산
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• pp.99-109
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• 1999

최근 인터넷 쇼핑몰에 대한 연구는 초기 쇼핑몰 구축설계 기법 및 보안, 인증 등에 대한 관심을 넘어서 인터넷 쇼핑몰의 추진전략에 대한 연구로 확대되고 있다. 그러나 대부분의 경우에 인터넷 쇼핑몰 추진방식에 대한 단편적인 현황을 설명하는 수준에 그치고 있다. 특히, 실재 공간에서의 지원 활동이 차지하는 중요성에 대한 인식이 재평가되고 있으나, 이에 대한 연구의 추진은 거의 전무한 상황이다. 따라서 인터넷 쇼핑몰을 추진하고자 하는 기업이 수행하는 온라인(on-line) 및 오프라인(off-line) 활동의 특성과 이들 간의 균형을 위한 연구의 전략적 중요성이 매우 높다. 이에 본 연구에서는 성공적인 인터넷 쇼핑몰 사업을 추진하기 위한 전략 연구의 일환으로 사례분석을 통해 온라인상과 오프라인상의 균형된 시각을 수립하는 데 도움이 되는 프레임워크를 제시한다.

• 비파괴검사학회지
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• 제22권6호
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• pp.599-608
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• 2002

The mechanical properties of mullite $(3Al_2O_3\;2SiO_2)$ environmental barrier coatings are determined using a laser-based ultrasonic system. The waveforms generated by a laser source in mullite coatings in the $1-20{\mu}m$ thickness range are evaluated theoretically using the integral transform technique. It is shown that the laser source generated the two lowest order SAW modes in these systems. Experimental waveforms are generated using a 600ps pulsed Nd:YAG microchip laser and detected using a stabilized Michelson interferometer. The dispersion curves for the generated modes are extracted from the experimental data and the mechanical properties of the coatings are obtained by minimizing the error between the measured and calculated velocity values. The waveforms generated in mullite coatings agree well with theory and laser-based ultrasonics is shown to provide an effective tool for the nondestructive evaluation of ceramic coatings.

• 한국산업융합학회 논문집
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• 제6권2호
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• pp.131-139
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• 2003

The links operating interrupted flow are intend to yield the traffic between the out flow and inflow part effect zone of street section, we build the delay model using the time gap between under construction and not. We review the applicability of interrupted flow, and thus we can put this data to practical use as the basis data to compute the inducement charge for traffic delay. Also building about traffic effect zone of interrupted flow wouldn't produce at the section beside occupying roads and construction cross section, thus we must review the plan to minimize traffic delay by the construction occupying road. In future there must be advanced the incomplete in this study, and groping for the various alternatives to minimize the traffic delay by the road occupying construction, with developing the various sets of detailed analyzing models, that is analysis on the street strength, crossroads geometrical forms of crossroads, public traffics, pedestrians, occupying types.

• 정보처리학회논문지:소프트웨어 및 데이터공학
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• 제5권11호
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• pp.569-584
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• 2016

본 논문에서는 Hadoop MapReduce 병렬 분산 컴퓨팅 환경을 이용해 개발한 공간 지식 추출기를 제안한다. 이 공간 지식 추출기는 대용량의 공간 데이터 집합으로부터, 임의의 두 공간 객체들 사이에 만족되는 위상 관계와 방향 관계를 나타내는 정성 공간 지식 베이스를 생성해낸다. 본 논문에서 제안하는 MapReduce 기반의 대용량 공간 지식 추출기 MRSPAKE는 HDFS 상의 분산 공간 데이터 파일에 대한 R 트리 색인과 범위 질의들을 이용함으로써, 웹 규모의 정성 공간 지식 베이스를 매우 효율적으로 추출해낸다. 대표적인 공개 데이터 집합인 Open Street Map(OSM)을 이용한 성능 분석 실험을 통해, 본 논문에서 제안하는 웹 규모의 공간 지식 추출기 MRSPAKE의 높은 성능과 확장성을 확인할 수 있었다.

• 대한건축학회논문집:계획계
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• 제35권1호
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• pp.117-125
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• 2019

The purpose of this study is to examine urban built environments associated with the walking behavior in order to identify the problem of urban infrastructure from the perspective of Universal design theory. Using the walkability criteria developed based on the findings of previous studies on Universal design theory and walking environment, the urban built environments in old town area of Seoul were evaluated. The results of the evaluation indicated that the pedestrian infrastructure in the study area had several shortcomings to improve in order to provide walking-friendly environments. First, the pedestrian infrastructure for visually impaired people were severely limited. Second, walking traffics in large portion of the street networks were interrupted by a variety of obstacles such as parked cars, signboards, and illegal street shops. Third, there were certain areas where the quality of pavement was not properly managed. In summary, this study provides an empirical data to understand the current situation of pedestrian infrastructure in the urban areas. Improvement of pedestrian infrastructure is needed to address the issues related to the mobility of the disabled people. It is also recommended to construct the GIS data on walking environment in order to develop and mange a long-term public investment plan for walking-friendly urban environments.

• 아태비즈니스연구
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• 제15권1호
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• pp.273-287
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• 2024

Purpose - This study conducts the co-occurrence analysis, one of the social network analysis using global OTA's online reviews and grades in order to understand the experience structure of foreign tourists visiting cutural tourism resources in Jeju, Korea. Design/methodology/approach - For this purpose, this study selects 6 cultural tourism resources in Jeju as the study sites, and collects qualitative review data (noun, adjectives, and verb) and quantitative grade data. Findings - The co-occurrence network analysis between words and grade of market and street shows that the grade of 5 appears the most simultaneous with pork, buy, lot, try, fresh, black, food, price, seafood, local, market, good, street, etc. and the grade of 1 connects with small, dish, better, taste, etc. And the co-occurrence network analysis between words and grade of tradition and folklore shows that the grade of 5 appears the most simultaneous with village, place, museum, visit, time, life, culture, women, diver, use, lot, etc. and the grade of 1 connects with minute, spend, room, recommend, honey, etc. Research implications or originality - The above research results are relevant in order to find out the core experience of foreign tourists using online review and grade generated by foreign tourists and use as the important information to develop the strategies related to the planning and management of cultural tourism resources.

• 한국컴퓨터정보학회논문지
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• 제16권1호
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• pp.183-189
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• 2011

본 논문은 기존의 TPEG, UTIS, DSRC 등의 교통 정보 시스템들의 문제점을 극복할 수 있는 사용자 기반의 교통정보시스템을 제안한다. 기존의 보편화된 서비스인 TPEG은 단방향 서비스로 하나의 정보 제공자에 위한 교통정보의 한계가 문제가 되고 있다. 또한 경찰청을 중심으로 하는 UTIS는 기존과는 다른 단말기를 요구하므로 지자체의 관용차나 택시 등으로 한정적인 사용자가 이용하고 있어서 전국적으로 모든 도로의 교통 정보를 수집하기에는 제한적이다. 따라서 보편화되고 있는 스마트폰 및 모바일 내비게이션 프로그램을 기반으로 사용자가 참여하는 교통정보 시스템을 구축하면, 더욱 더 많은 데이터를 수집하여 전국적으로 자세한 교통 정보를 제공할 수 있게 된다. 하지만 새로운 시스템에서는 실시간으로 늘어나는 대용량 교통데이터가 문제가 될 수 있다. 본 논문에서는 기존의 일반적인 튜플 단위의 데이터 처리 시스템을 사용하지 않고, 블록단위로 데이터를 처리하는 새로운 교통정보 데이터저장 관리자를 설계하고 기존 상용 DBMS와 비교 평가하였다.