• Journal of the Institute of Electronics Engineers of Korea SP
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• v.48 no.4
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• pp.142-152
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• 2011

In general, existing emergency evacuation guiding systems depend on visual techniques like emergency lights or LEDs. Actually people in the case of fire emergency condition may not obtain a range of view because of smoke from the fire. This paper introduces a technique to design an emergency guiding system using directivity sound to cope with this problem. In this case all speakers are serially connected for audio signal transmission in a serial fashion to achieve convenient speaker installation. Floyd algorithm is used to find shortest evacuation paths. Because serially connected multi-channel speakers are weak in case of disconnection, this paper uses a technique to solve the diagnostic problem. In the proposed system, a PC based on the USB protocol is used for control and observation. The system has achievements, such as increasing evacuation rate under emergency conditions, and serial transmission of audio signal for easy maintenance and low installation cost.

• Journal of the Economic Geographical Society of Korea
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• v.23 no.1
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• pp.110-123
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• 2020

The advanced industrial economies have been suffering from rapid de-industrialization since the 1970s. In order to overcome such crisis, many countries have attempted to establish science parks and technopoles. Sophia Antipolis in France is one of the best examples of the worldly known technopoles, which was launched in the late 1960s. However, earlier evaluations on the technopole were not positive, while there were no dynamic innovative activities among institutions and firms of the technopole at least up to the early 1990s. While some changes in such circumstance have been observed since then, this paper attempts to investigate the changes and transformations occurring from the technopole since the late 1990s. Based on the review of the recent publications, statistics and expert interviews, the current paper concludes that Sophia Antipolis has been transformed into a dynamic and innovative technopole.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.5
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• pp.181-190
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• 2013

PMIPv6(Proxy Mobile IPv6) is a network-based IP mobility management protocol, which can control the mobility without depending on the type of access system or the capability of mobile node. Combining it with SIP mobility, it can establish the route optimization effectively and ensure the terminal mobility and the session mobility. There are many literatures on PMIPv6-SIP in mobility management, but efficient performance analysis and mathematical modeling has not been standardized. For this, a new PMIPv6-SIP architecture is proposed to compare with Pure-SIP in terms of the handover delay and packet loss.

• Journal of Korean Society of Transportation
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• v.29 no.6
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• pp.7-16
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• 2011

This study investigates the degree of dependency on freeways when auto travelers make route choices in the Seoul Metropolitan Area. The investigation is conducted based on aggregated auto trip data, defining the degree of dependency as the proportion of auto trips selecting freeways in their travel paths. The analyses reveal that the trips departing from the areas with higher accessibility to freeways tend to exhibit higher dependency on freeways. In addition, the dependency is significantly affected by the travel time differences between two paths including and excluding freeways, respectively. The number of service interchanges was found to be one of significant factors for trips to Incheon and Gyenggi areas. The finding indicates that the factors affecting the degree of dependency on freeways may vary depending on the areas' characteristics. The findings would enhance the understanding of drivers' route choice behavior in Seoul at an aggregate level.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.8
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• pp.200-209
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• 2017

This study examined the mediating effect of depression on the relationship between over-control parenting styles and mobile phone dependency among children. The 5th-year longitudinal data from the Korean Children & Youth Panel Survey (KCYPS) were collected from 4th grade elementary school students. The data were analyzed by the structural equation modeling and bootstrapping. The results of this study were as follows. First, there is a positive path from over-control parenting styles to depression, from depression to mobile phone dependency, and from over-control parenting styles to mobile phone dependency. Second, depression had a mediating effect on the association between over-control parenting styles and mobile phone dependency. Based on these results, more study of elementary school students' reliance on cell phones is needed.

• Tunnel and Underground Space
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• v.21 no.2
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• pp.117-127
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• 2011

The purpose of this study is to demonstrate the effect of in-situ rock stresses on the deformability and permeability of fractured rocks. Geological data were taken from the site investigation at Forsmark, Sweden, conducted by Swedish Nuclear Fuel and Waste Man-agement Company (SKB). A set of numerical experiments was conducted to determine the equivalent mechanical properties (essentially, elastic moduli and Poisson's ratio) and permeability, using a Discrete Fracture Network-Discrete Element Method (DFN-DEM) approach. The results show that both mechanical properties and permeability are highly dependent on stress because of the hyperbolic nature of the stiffness of fractures, different closure behavior of fractures, and change of fluid pathways caused by deformation. This study shows that proper characterization and consideration of in-situ stress are important not only for boundary conditions of a selected site but also for the understanding of the mechanical and hydraulic behavior of fractured rocks.

• Geotechnical Engineering
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• v.5 no.3
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• pp.19-28
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• 1989

This study has been carried out as a fundamental course for the analysis of the constitutive- equation for the materials like sands being hardened during Ehear. For this aim, experimentall tests with variable stress paths for the concrete material are performed using the cubical multi- axial test in which the three principle stresses are arbitrarily controlled. Stress-strain behaviors. and strength characteristics are suggested in octahedral planes. Various tests such as HC, CTC, . TC, 55 are performed. The main results summarized are as follows; 1. The order of strength from the largest to the smallest is CTC, TC, SS, and TE test. 2. The octahedral Ehear strength of concrete specimens is dependent upon the stress path(8) 3. There is a direct relation between strength and confining pressure. 4. The ultimate envelopes in the octahedral planes are non-circular-cone shaped. 5. Any ultimate criteria used to predict the strength behavior of concrete must include thin effect of the tensile stresses.

• Journal of the Korean Institute of Landscape Architecture
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• v.47 no.2
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• pp.133-145
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• 2019

This study was raised by the need to explain why the problems related to private parks have been sustained. In order to identify the fundamental cause, it is necessary to analyze the historical and institutional context of private parks. Therefore, the purpose of this study is to identify the direction of change in the private park system and to derive the characteristics of the system as it currently appears. The framework based on the historical institutionalism was divided into the Park Act (1967-1980), the former of Urban Park Act (1980-1993) and the late of Urban Park Act (1993-2005), and each was assessed using the analysis elements of the institutional environment and the outcomes of implementation. The analysis elements interpreted the path dependency, in which the inertia toward the choice of institution is maintained, despite the change in the environment. The institution took a special form of 'negative systeme' and secured profitability by expanding the types of park facilities while mitigating the criteria. Additionally, the designation of private park promoters as a landowner acted as a means of compensating those with property rights to unexecuted urban parks. The expectation effectiveness on urban park creation was insufficient and the environmental regulatory functions were weakened. Thus, historically, the private park system in Korea has experienced an 'institutional decoupling' as the purpose of the system and the results of actual outcomes are not consistent.

• Journal of Global Scholars of Marketing Science
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• v.6
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• pp.313-337
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• 2000

오늘날 병원마케팅에서 간호서비스는 병원 내 어느 전문직보다도 가장 많은 시간을 고객인 환자와 합께 나누며 환자의 욕구 충족을 위하여 고도의 분업화된 제반 부서들간의 활동을 조정하고 융화시키는 역할올 통하여 환자들이 지각하는 병원서비스의 만족도에 종요 한 부분을 차지하고 있으므로 병원마케팅의 전략적 초점으로 전환될 필요가 있다. 의료 서비스는 특성상 전문성이 강해서 정보가 소비자에게 공유되지 못하고 있으며 비영리조직이라는 인식하에 의료 서비스에 대한 광고를 제한합으로써 실제적으로 소비자에게 필요한 의료 관련 정보들마저도 제한을 받는 경우가 많이 있다. 그리고 의료서비스의 무형성, 비분리성, 이질성, 소멸성의 특성으로 어떠한 의료 서비스를 이용할 것인지해 대한 결정을 고객이 하기 어렵기 때문에 오늘날 의료 소비자들이 의료제공 기관을 선택 할 때는 밑올만한 다른 사랑의 추천에 크게 의존하고 있는 것으로 알려져 있으며, 국내의 연구에서도 의료소비자들이 병원을 선택하는 주된 정보 획득 원천이 주변의 제 3자인 것으로 알려져 있다. 이러한 정보 전달에 구전 커뮤니케이션이 주요한 제3자적 억할을 한다. 이러 한 관접에서 불 때 의료 소비자둘 사이의 구전 커뮤니케이션은 마케 팅 전략상 매우 종요하 며 마케팅 관리측면에서 의료 소비자들의 구전 커뮤니케이션 형태톨 파악하는 것은 매우 중요한 일이라고 할 수 있다. 이에 본 연구는 구전 커뮤니케이션의 내용 및 경로 그리고 유형을 파악하고 이들 유형간 의료서비스의 만족도를 알아봄으로써 효파적인 병원 마케팅 전략을 수립하는데 필요한 자료를 제공하고자 한다. 본 연구의 결과를 증합해 보면 의료소비자들이 연령 성별 학력, 소득, 직업, 주거지가 비슷한 사람과 구전이 활발하게 일어냐는 것을 파악 할 수 있어 특히 상업적 광고가 제한 된 병원의 마케팅 전략에 oH우 유용한 것이 훨 수 있다. 또한 불만족한 소비자일수록 발신 자적 입장에 서서 주위의 사람들에게 활발한 구전 활동을 수행하고 었음을 알 수 있다. 이 는 의료 소비자들이 만족한 경우보다는 불만족한 경우에 더욱 구전을 수행하려는 의지가 강해짐올 시사한다. 따라서 병원은 소비자들의 불만을 감소시키기 위해 노력해야 한다. 특히 의료인의 친절함이 가장 많이 구전이 되는 것을 알 수 있었는데 의사나 간호사는 치료 나 간호의 직접적인 제공자로서 의료 소비자들의 만족도에 중요한 영향을 미치므로 의료소 비자들의 요구에 부응하는 서비스를 충족시켜 줄 수 있도록 노력해야하며 이러한 바탕 위에 병원마케팅 전략이 수립되어야 할 것이다.

• Korean Journal of Construction Engineering and Management
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• v.5 no.2 s.18
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• pp.90-105
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• 2004

Machines for crack sealing automation have been continually developed since the early 1990's because of the effectiveness of crack sealing that would be able to improve safety, quality and productivity. It has been considered challenging problem to detect crack network in pavement which includes noise (oil marks, skid marks, previously sealed cracks and inherent noise). Moreover, it is required to develop crack network mapping and modeling algorithm in order to accurately inject sealant along to the middle of cut crack network. The primary objective of this study is to propose machine vision algorithms (digital image processing algorithm and path planning algorithm) for fully automated pavement crack sealing. It is anticipated that the effective use of the proposed machine vision algorithms would be able to reduce error rate in image processing for detecting, mapping and modeling crack network as well as improving quality and productivity compared to existing vision algorithms.