• Smart Structures and Systems
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• 제24권5호
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• pp.587-595
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• 2019

Deformation measurement of large scale structures, such as the ground beds of high-rise buildings, tunnels, bridge, and railways, are important for insuring service quality and safety. The pose-relay videometrics method and displacement-relay videometrics method have already presented to measure the pose of non-intervisible objects and vertical subsidence of unstable areas, respectively. Both methods combine the cameras and cooperative markers to form the camera series networks. Based on these two networks, we propose two novel videometrics methods with closed-loop camera series network for deformation measurement of large scale structures. The closed-loop camera series network offers "closed-loop constraints" for the camera series network: the deformation of the reference points observed by different measurement stations is identical. The closed-loop constraints improve the measurement accuracy using camera series network. Furthermore, multiple closed-loops and the flexible combination of camera series network are introduced to facilitate more complex deformation measurement tasks. Simulated results show that the closed-loop constraints can enhance the measurement accuracy of camera series network effectively.

• 한국정보통신학회논문지
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• 제18권9호
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• pp.2073-2078
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• 2014

본 논문에서는 우리나라의 서해와 남해 그리고 동해의 연안과 해상의 DGPS 전파 환경을 측정하여 연안 여객선 항로 구간에서의 DGPS 서비스 영역을 분석한다. 전파 장애물로 작용할 수 있는 다도해 지역과 섬 지역의 지형적 장애물에 대한 영향을 측정하여 국내 연안 지역의 서비스 영역을 분석한다. 해상 DGPS 기준국은 $40dB{\mu}V/m$이상의 전계 강도와 10 dB 이상의 신호대 잡음비를 갖는 넓은 해상 서비스 영역을 제공하고 있으며, DGPS 기준국간 서비스 영역의 중복으로 다도해를 포한한 연안 여객선 항로 구간에서 양호한 DGPS 서비스를 제공하고 있다. 전파 장애물이 산재되어있는 지역에서는 전력 증강 및 안테나 효율 보강 시 더욱더 양호한 서비스 영역을 제공할 수 있다.

• 한국IT서비스학회지
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• 제10권2호
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• pp.141-162
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• 2011

The controls of Information Systems (IS) have been an more critical issue controls as the sophistication and integration of IS is more proceeded. ITGI (The Information Technology Governance Institute) of ISACA (Information Systems Audit and Control Association) has suggested COBIT (Control Objectives for Information and related Technology) and this has been widely recognized the evaluation model of IS controls. In COBIT, IS was evaluated in terms of process, information quality, and IT resources. This study used COBIT in order to suggest and empirically test an evaluation model of IS service. The data was collated from one major Chinese SI (Systems Integration) company in four domains of processes : planning and organization, acquisition and implementation, delivery and support, and monitoring. Seven factors are extracted using an exploratory factor analysis as follows : Overall IT planning process, technological assessment process in IT planning of IT, cost-benefit assessment process in IT planning, implementation process, support process, monitoring process, post-implementation evaluation process. The results of confirmatory analysis of three alternative measurement models indicated that the measurement model with one inherent or conceptual variable has greater model fitness than the other models. This study suggests the logical and general way to test and apply COBIT in evaluating IS services.

• 디지털산업정보학회논문지
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• 제7권1호
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• pp.1-9
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• 2011

In this paper, Wireless sensor network technology applied to various greenhouse agro-industry items such as horticulture and local specialty etc., we was constructed automatic control system for optimum growth environment by measuring growth status and environmental change. existing monitoring systems of greenhouse gather information about growth environment depends on the temperature. but in this system, Can be efficient collection and control of information to construct wireless sensor network by growth measurement sensor and environment monitoring sensor inside of the greenhouse. The system is consists of sensor manager for information processing, an environment database that stores information collected from sensors, the GUI of show the greenhouse status, it gather soil and environment information to soil and environment(including weather) sensors, growth measurement sensor. In addition to support that soil information service shows the temperature, moisture, EC, ph of soil to user through the interaction of obtained data and Complex Growth Environment information service for quality and productivity can prevention and response by growth disease or disaster of greenhouse agro-industry items how temperature, humidity, illumination acquiring informationin greenhouse(strawberry, ginseng). To verify the executability of the system, constructing the complex growth environment measurement system using wireless sensor network in greenhouse and we confirmed that it is can provide our optimized growth environment information.

• 한국의료질향상학회지
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• 제5권1호
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• pp.2-14
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• 1998

The aim of this study was to examine differences in the level of satisfaction with medical care at a public health center between patients receiving free-care compared to those paying out-of-pocket. SERVQUAL(Comprehensive Service Quality Measurement Scale), a pyschometrically valid measure for evaluating hospital service quality, was used to assess patient satisfaction. The study sample consisted of 279 patients who received medical care at a public health center. The interview was conducted between April 23 and May 7, 1998. The results was as follow: 1. There were more elderly people among free-care patients than out-of-pocket patients. Education and income levels were lower amongs those receiving free-care. There were, however, no differences in the distribution of gender and religion between the two groups. Patients receiving free-care tended to visit the public health center more frequently compared to those self-paying patients. 2. Overall, free-care patients showed higher satisfaction level than that of self-paying patients. except for the dimension on sympathy and shape.

• 한국항해항만학회지
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• 제45권5호
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• pp.231-237
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• 2021

Enhancing the performance of maritime wireless communication has been highlighted by the issue of cell planning in the sea area because of lack of an appropriate Propagation Loss Model (PLM). To resolve the cell planning issue in vast sea areas, it was essential to develop the (PLM) matching the intended sea area. However, there were considerable gaps between the prediction of legacy PLMs and field measurement in propagation loss and there was a need to develop the adjusted PLM (A-PLM). Therefore, cell planning was performed on this adjusted model, including modification of the base station's location, altitude, and antenna azimuth to meet the quality objectives. Furthermore, in order to verify the availability of the cell planning, Communication Service Quality Monitoring System (CS-QMS) was developed in the LTE-Maritime project to collect LTE signal quality information from the onboard equipment at regular intervals and to ensure that the service quality was high enough to satisfy the goals in each designated grid. As a result of verification, the success rate of RSRP was 95.7% for the intensive management zone (IMZ) and 96.4% for the interested zone (IZ), respectively.

• International Journal of Computer Science & Network Security
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• 제21권3호
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• pp.229-234
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• 2021

The explosive growth of video-based services is considered as the dominant contributor to Internet traffic. Hence it is very important for video service providers to meet the quality expectations of end-users. In the past, the Quality of Service (QoS) was the key performance of networks but it considers only the network performances (e.g., bandwidth, delay, packet loss rate) which fail to give an indication of the satisfaction of users. Therefore, Quality of Experience (QoE) may allow content servers to be smarter and more efficient. This work is motivated by the inherent relationship between the QoE and the QoS. We present a no-reference (NR) prediction model based on Deep Neural Network (DNN) to predict video QoE. The DNN-based model shows a high correlation between the objective QoE measurement and QoE prediction. The performance of the proposed model was also evaluated and compared with other types of neural network architectures, and three known machine learning methodologies, the performance comparison shows that the proposed model appears as a promising way to solve the problems.

• 한국융합학회논문지
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• 제9권12호
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• pp.239-250
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• 2018

본 연구는 한국과 중국 소비자들 간의 배달음식 앱에 대한 고객만족과 서비스 품질 요소의 영향력 정도를 분석하고자 하였다. 이러한 연구목적을 달성하기 위해서 MOBISQUAL이란 모바일 인터넷 서비스 품질 측정 도구를 통해 가설구조의 모형을 설정하였다. 연구결과, 한국소비자는 유희성과 충족성이 고객만족에 대해 긍정적인 영향을 미치는 것으로 나타났으며, 중국 소비자는 유희성, 유용성, 개인화, 디자인, 용이성, 안전성이 고객만족에 대해 긍정적인 영향을 미치는 것으로 나타났다. 본 연구결과는 한국과 중국 소비자들에게 배달음식 앱이 고객만족에 대한 영향을 미치는 요소 간의 차이가 있음을 발견하였고 이를 통해 관련 기업에서 고객만족을 위해 고려해야할 부분을 제시했다는데 의의가 있다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 춘계학술대회 논문집
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• pp.1325-1329
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• 2007

Indoor air quality is an important determinant of human health and comfort. However, the complexity of pollution sources and the multitude of parties responsible for creating indoor exposures makes the improvement of air quality difficult. The HVAC(Heating, Ventilating and Air-Conditioning) system is important facility to provide comfortable environment passenger service. The Ministry of Environment is established "Indoor Air Quality Management guidelines in Public Facilities"in December 2006. Hereupon, the train and the subway are included. In this research air quality in the Subway compartment has been measured. As a result, the concentrations of PM10 and $CO_2$ were reached to 93% and 61% of the regulation values, respectively. Thus, the indoor air qualities of subway have been proved that they satisfy the recommended guidelines by the Ministry of Environment.

• 한국콘텐츠학회논문지
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• 제17권7호
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• pp.455-477
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• 2017

본 연구는 지속가능한 축제품질 척도 개발 가운데 축제 서비스품질 척도를 개발하여 결과변수인 축제만족, 행동의도 간의 영향관계를 실증적으로 검증하였다. 축제 서비스품질의 구성요인은 편의성, 정보성, 친절성, 운영성, 외형성이다. 척도의 개발의 목적은 축제 서비스는 대규모 집객환경에서 제공되는 서비스로 다양한 축제콘텐츠가 연행되는 가운데 대인서비스가 제공되고 있으므로 이와 같은 상황을 반영한 새로운 측정도구를 개발하기 위함이다. 본 연구에서는 척도를 개발하기 위한 분석의 틀로써 축제 서비스품질과 관련된 183편의 선행연구를 탐색하여 5개의 구성요인을 도출하였고 후속적 문헌연구를 통해 축제 서비스품질 척도를 개발하였다. 개발된 척도를 실무적으로 검증하기 위해 "화천산천어축제"에 참여한 방문객을 표본 집단으로 이용하였다. 분석결과, 축제 서비스품질 구성요인 가운데 정보성, 친절성, 운영성이 축제만족에 정(+)의 영향을 미치는 것으로 나타났다. 그리고 축제만족은 행동의도에 정(+)의 영향을 미치는 것으로 나타났다. 본 연구는 기존의 선행연구들과 달리 축제의 서비스적인 측면만을 고려하여 우리나라 지역축제의 서비스를 평가하기 위한 척도를 개발하여 실무적으로 검증하였다. 이로써 지역축제라는 특수한 환경에서 제공되는 대인 서비스를 객관적으로 평가하기 위한 세분화된 축제품질 측정의 토대를 마련하였다.