• 대한치과의료관리학회지
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• 제10권1호
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• pp.1-8
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• 2022

This study introduces research on the quality of medical services, optimization of medical services, dental medical services, implant medical services, and time schedules, as well as the effective process of dental implant medical services, which is expensive and requires a long treatment period. For improvement, it is suggested to evaluate using a time schedule. In this method, a time schedule is prepared in which each step, starting from the patients appointment until the completion of the treatment process, is allotted a certain time. This schedule was finalized in consultation with the employees. When performing all implant operations, the starting time of each item was checked to evaluate the degree of compliance and to understand any reasons for delay in each step. After identifying the causes for delay at each step, suitable steps to rectify the drawbacks were developed, and an optimal plan for patient management was determined. Changes in waiting time and human resource utilization were shown as concrete data, suggesting that such a schedule is meaningful as a decision-making support tool.

• 한국통신학회논문지
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• 제25권5A호
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• pp.660-667
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• 2000

이 논문은 CDMA 이동전화 기지국의 통화량(Traffic) 분석을 위한 연구이다. RTD(Round Trip Delay)는 기지국과 이동국 사이의 통화로 구성 소요시간을 계산하는 하나의 개선된 방법이다. RTD 방식을 이용하여 무선통신 구간에서 발생하는 통화로 접속시간을 계산하고, 하나의 기지국(교척교)에서 실험을 실시하여 실제거리와 RTD 값의 차이를 비교 분석하였다. 또한 CDMA 기지국(BTS) Traffic과 중계기(BTS로부터 RF를 직접 분기하여 호를 처리) 사이의 Traffic을 구분하기 위한 하나의 방법으로 RTD 방식을 제안하였고, 이를 확인하기 위해 기지국의 중계기 수신단에 일정한 지연(임의의 Delay) 소자를 삽입하여 모국(BTS)과 자국(중계기)의 수신신호 시간 차이(Gap)에 의한 Traffic 분석 실험을 통해서 그 유효성을 입증하였다.

• Journal of Information Technology Applications and Management
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• 제12권3호
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• pp.129-150
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• 2005

Due to the advance of the Internet, the electronic commerce is getting more widely used, and customer's demand for the e-Commerce service quality is rapidly increasing. On the other hand, e-Commerce companies required the Internet services whose quality is provided more reliable service to their customers. Therefore, it is very important to provide both e-Commerce companies and customers with the measurement and service quality in real-life network environment. But the research on the service quality measurement method for electronic commerce systems has been limited because ISP and e-Commerce providers seldom disclose detailed service measures such as, where and how much service delay incurred. In this paper, we construct sample e-Commerce systems and try to measure the service quality of the systems in real network environment. We have analyzed the delay zones and causes using a measurement tool. We must reflect the improvement method against delay causes. Accordingly, the customers can be experiences the better service quality. We hope that this research will be the groundwork for future research on the service quality of various types of e-Commerce systems and online services.

• International Journal of Computer Science & Network Security
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• 제23권1호
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• pp.153-163
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• 2023

This study is situated in the context of intelligent transport systems, where in-vehicle devices assist drivers to avoid accidents and therefore improve road safety. The vehicles present in a given area form an ad' hoc network of vehicles called vehicular ad' hoc network. In this type of network, the nodes are mobile vehicles and the messages exchanged are messages to warn about obstacles that may hinder the correct driving. Node mobilities make it impossible for inter-node communication to be end-to-end. Recognizing this characteristic has led to delay-tolerant vehicular networks. Embedded devices have small buffers (memory) to hold messages that a node needs to transmit when no other node is within its visibility range for transmission. The performance of a vehicular delay-tolerant network is closely tied to the successful management of the nodes' transit buffer. In this paper, we propose a message transit buffer management model for nodes in vehicular delay tolerant networks. This model consists in setting up, on the one hand, a policy of dropping messages from the buffer when the buffer is full and must receive a new message. This drop policy is based on the concept of intermediate node to destination, queues and priority class of service. It is also based on the properties of the message (size, weight, number of hops, number of replications, remaining time-to-live, etc.). On the other hand, the model defines the policy for selecting the message to be transmitted. The proposed model was evaluated with the ONE opportunistic network simulator based on a 4000m x 4000m area of downtown Bouaké in Côte d'Ivoire. The map data were imported using the Open Street Map tool. The results obtained show that our model improves the delivery ratio of security alert messages, reduces their delivery delay and network overload compared to the existing model. This improvement in communication within a network of vehicles can contribute to the improvement of road safety.

• 한국정밀공학회지
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• 제32권5호
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• pp.447-454
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• 2015

Design and application of hardware-in-the-loop simulation (HILS) for design of CNC-controlled machine tool feed drives is discussed. The CNC machine tool is a complex mechatronics system where the complexity results from the software-based controller composed of a variety of functionalities and advanced control algorithms. Therefore, using a real CNC controller in the control simulation has merits considering the efforts and accuracy of the simulation modeling. In this paper challenges in HILS for a CNC controlled feed drive, such as minimization of time delay and transmission error that are caused by discretization of the feed drive model, is elaborated. Using an experimental HILS setup of a machine tool feed drive applications in controller gain selection and CNC diagnostics are presented.

• 한국항공운항학회지
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• 제23권1호
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• pp.41-48
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• 2015

Being a cost-efficient solution for alleviating the traffic congestion in airspace, Air Traffic Flow Management (ATFM) has drawn more attentions from not only air traffic controllers but also researchers in the field of Air Traffic Management (ATM). Among other ATFM initiatives, it is believed that Ground Delay Program (GDP) could be effectively applied to reduce the congestion particularly in the relatively small airspace with dense traffic demand. This paper introduces a novel way that suggests flights to be delayed on the departing airports together with amount of the delays (in time) for those flights to be delayed. Adopting a fast-time simulation for predicting airspace delay of each flight for a given flight plan, the method is designed to iteratively and incrementally adjust the departure times in the plan towards reducing total airspace delays. Applying the method to Jeju airport with a hypothetically high demand, the paper demonstrates the airspace delay could be significantly reduced by applying GDP at Gimpo airport where more than 60% of Juju-bound flights departure. Although the simulation model needs to be calibrated and validated for the real-world application, the results clearly shows that the approach can possibly implemented as a tool for preparing the daily plan at the pre-tactical stage defined in the ICAO ATFM manual.

• The Journal of Korean Physical Therapy
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• 제27권4호
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• pp.183-189
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• 2015

Purpose: The aim of this study was to examine the test-retest and inter-rater reliability of the pediatric functional muscle testing (PFMT) when applied to children with developmental delay. Methods: Sixteen children with developmental delay (seven females, nine males) participated in this study. For the inter-rater reliability, each was scored on the PMFT by two pediatric physical therapists with more than 8 years of clinical experience on the same day. For assessment of the test-retest reliability, one therapist tested the children again within 10 days. The second measurement was performed by taking a first measurement in video. Intraclass correlation coefficient (ICC) was calculated to determine the test-retest and inter-rater reliability of the PFMT, and Chronbach's alpha was used to measure internal consistency. Results: The results of this study were as follows: 1) The test-retest ICC of the score of the infant action month and the right side of the PFMT was from 0.53 to 1.00 and from 0.63 to 0.99, respectively. 2) The inter-rater ICC of the score of the infant action month and the right side of the PFMT was from 0.66 to 1.00 and from 0.64 to 1.00, respectively. 3) Chronbach's alpha was 0.93. The internal consistency indicated excellent. Conclusion: In conclusion, this study showed that the test-retest and inter-rater reliability of the PFMT was relatively high, except for a few items. Therefore, it can be suggested that the PFMT will be a useful tool for measurement of muscle strength for children with developmental delay if it be some modifications.

• 한국ITS학회 논문지
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• 제10권6호
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• pp.24-31
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• 2011

본 연구는 회전교차로의 운영효과를 다루고 있다. 회전교차로는 신호교차로에 비해 지체감소와 친환경적이라는 기존 연구결과에 따라 우리나라에서 설치가 고려되는 실정이다. 본 연구의 목적은 보행교통량을 고려한 회전교차로의 운영효과를 분석하는데 있다. 이를 위해 이 연구는 교차로 네트워크를 구성하고 보행교통량과 진입교통량에 따른 분석시나리오를 설정하고, 차량당 평균제어지체 비교 분석에 중점을 두고 있다. 이 연구에서는 VISSIM 프로그램이 교통 시뮬레이션 도구로 사용된다. 분석된 주요결과는 다음과 같다. 첫째, 보행교통량에 근거하여 지체를 분석한 결과, 보행교통량이 회전교차로의 운영에 큰 영향을 미치는 것으로 분석되었다. 둘째, 보행교통량이 증가할수록 회전교차로의 지체도 증가하여, 보행교통량 1,000인/시 일 때 1차로 회전교차로에서는 총 진입교통량 800pcph, 2차로 회전교차로에서는 1,600pcph 이상 진입 시 신호교차로가 회전교차로보다 운영효율이 높게 평가되었다.

• 전자공학회논문지A
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• 제32A권12호
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• pp.149-158
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• 1995

This paper describes the development of a software tool LCD FRAME that may guide the analyzing process for the electrical characteristics and the design procedure for constructing the thin film transistor liquid crystal display(TFT/LCD) packages. LCD FRAME can analyze its electrical characteristics from the TFT/LCD system package configuration, and provide the design variables to meet the user's requirements. These analysis and design procedure can be done in real time according to the model at simplified package level of TFT/LCD. LCD_FRAME is an object-oriented expert system which considers package elements as objects. With this LCD_FRAME software tool, we analyzed the I-V characteristics of a-Si TFT and its signal distortion which has maximum 1.58 $\mu$s delay along the panel scan line of the package containing 480 ${\times}$ 240 pixels. We designed the package structure of maximum 6.35 $\mu$s signal delays and 3360 ${\times}$ 780 pixels, and as a result we showed that the proper structure of 20 $\mu$m scan line width, 60$\mu$m panel TFT gate width and 8 $\mu$m gate length. This LCD_FRAME software tool provides results of the analysis and the design in the form of input files of the SPICE program, text data files, and graphic charts.

• 한국건설관리학회논문집
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• 제18권6호
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• pp.65-77
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• 2017

최근 대형 건설회사의 해외시장 비중 확대와 함께 해외 프로젝트에서의 공기지연에 따른 경영 손실에 대한 이슈가 지속적으로 제기되고 있다. 일반적으로 대형 프로젝트의 수행 과정에서 변경은 필연적으로 발생한다. 대부분의 변경은 공기지연과 연결되기 때문에 변경으로 인하여 공기연장이 필요한 경우 건설사는 계약에서 정한 기준에 따라 공기지연을 관리해야 공기지연에 따른 리스크에 효과적으로 대응할 수 있다. 공기지연을 유발하는 변경에 대한 계약적 대응이 부족할 경우 클레임이 해결되지 않고 분쟁으로 확대되는 경우가 많다. 프로젝트 초기 단계에 계약에서 요구하는 공기지연 관리 절차와 방법을 분석하는 것이 중요하나 이에 대한 방법 및 도구를 제시하지 못하고 있었다. 본 논문에서는 국내 주요 건설사들의 공정관리 실무 및 해외 공사에서의 클레임 및 분쟁사례에 대한 고찰을 통해 문제를 제시하고 해외 건설 계약조건상에 포함된 공기지연 관리 리스크를 평가할 수 있는 방법을 제시하였다. 공기지연의 합리적 대응과 관련된 계약조건상의 리스크 평가 틀을 제시하기 위하여 FIDIC Red Book(1999), PSSCOC(2014) 및 SIA 9th Edition(2010) 등 국제 표준 계약조건 뿐만 아니라 ARAMCO 및 QP를 포함한 해외 대형 발주자의 표준계약조건에 나타나 있는 공기지연 관리 요건 및 수준을 검토하여 전체 7개 영역, 62개 항목으로 구성된 계약조건 리스크 평가모델을 제안하였다. 계약조건 리스크 평가 모델은 계약조건상의 공기지연리스크 확인을 위한 구조적 틀을 제공하며 개별 리스크 항목별 표준적인 수준을 제시함으로써 해당 프로젝트의 리스크 수준을 확인하고 이에 효과적으로 대응할 수 있는 단초를 제공한다. 제안된 모델의 유효성 검증을 위하여 실제 제안한 모델을 실제 프로젝트에 적용하여 그 효과를 입증하였다.