• Journal of Korean Society of Transportation
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• v.25 no.2 s.95
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• pp.83-93
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• 2007

Pedestrians and vehicle users should be treated with equal importance in urban street design. However, current street design suggests that the design criteria for sidewalks is based on the functional hierarchy of the vehicles, therefore it is necessary to develop sidewalk design standards that give more weight to pedestrians rather than vehicles. For this, this study suggests that the level of service of pedestrians should be considered in the process of designing sidewalks. Currently, level of service (LOS) criteria for pedestrians in the Korean Highway Capacity Manual are based on pedestrian volume, but the volume of pedestrians is seldomly estimated in practice. So, the current LOS criteria has limitations in terms of practical use. Also, the study assumes that the pedestrian flow rate is hardly the dominant factor that could affect the LOS of pedestrians at most urban sidewalks. In this context, the study considers a new LOS for sidewalk design based on the comfort of pedestrians while passing pedestrians coming from the opposite direction. Then the study attempts to link the new LOS criteria to the land use patterns using data of pedestrian traffic characteristics acquired from the field. In addition to this, the scope in which the suggested criteria can be applied is suggested.

• Journal of Korean Society of Transportation
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• v.30 no.1
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• pp.149-159
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• 2012

The evaluation of public transit service quality is more complicated than evaluating other aspects of transportation service. Although various measures of effectiveness [MOEs] for transit service have been studied and applied, a more comprehensive and accurate MOE is still required. In the past, either data from user surveys or the experience of bus agency administrators and/or engineers used to measure the quality of service. However, recently, with reliable and accurate real time data from BMS(Bus Management System) and BIS(Bus Information System), more reliable and accurate MOEs are available. This study develops a service evaluation model from users' perspectives, which is based on user' cost models that consider passenger access time, riding time, waiting time, and discomfort due to in-vehicle overcrowding, violation of traffic laws, and accident rate. For validating proposed model, data from the BMS and transit-fare cards (T-Money Card) for Seoul's No. 472 main bus line were used. Models developed in this study provided reliable results.

• Journal of Korean Society of Transportation
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• v.26 no.3
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• pp.169-178
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• 2008

Level of Service (LOS) is one of ways to evaluate operational conditions. It is very important factor in evaluation especially for the facility of highways. However, some studies proved that ${\upsilon}/c$ ratio and accident rate is appeared like a second function which has a U-form. It means there is a gap between LOS and safety of highway facilities. Therefore, this study presents a method for evaluation of a signalized intersection which is considered both smooth traffic operation (delay) and traffic safety (accident). Firstly, as a result of our research, accident rates and EPDO are decreased when it has a big delay. In that reason, it is necessary to make a new Level of Service included traffic safety. Secondly, this study has developed a negative binominal regression model which is based on the relation between accident patterns and stream. Thirdly, standards of LOS are presented which is originated from calculation between annual delay costs and annual accident cost at each intersection. Lastly, worksheet form is presented as an expression to an estimation step of a signalized intersection with traffic accident prediction model and new LOS.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.3D
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• pp.335-345
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• 2009

Generally, density is used as a measure of effectiveness (MOE) of the level of service (LOS) for the basic segment of the roadway facility, but can not express the operational condition of the roadway facility properly because there can be an error in the computed density compared with the density measured in the field. Thus, the purpose of this study is to investigate the real-time traffic characteristic data (traffic flow, speed, occupancy, headway, spacing, etc.) from the detectors installed on the mainline section of urban freeway under the study, analyze the maximum flow rate from the relationship between the real-time traffic characteristics collected, and evaluate the LOS criteria within the basic segment of the urban freeway based on the relationship between the occupancy and the v/c ratio depending on the level of service.

• 한국항공운항학회:학술대회논문집
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• 2016.05a
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• pp.281-286
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• 2016

국 내외 기업들이 새로운 경영기법으로 도입하고 있는 아웃소싱은 비용절감, 핵심 업무에 대한 집중, 생산성 제고 등의 장점으로 빠르게 확산되고 있다. 인천국제공항 역시 공기업 경영혁신과 내부요인 등으로 인해에 개항과 함께 아웃소싱을 도입하였으며, 2014년 3월 현재에는 43개 분야에 아웃소싱을 도입하여 운영하고 있다. 이처럼 아웃소싱 도입이 확산 되면서 성공적인 아웃소싱 관리에 대해 모색하게 되었고, 인천국제공항 역시 효율적인 관리를 위해 주로 IT 분야에서 적용하고 있는 서비스수준협약(Sercive Level Agreement, SLA)을 전 분야에 걸쳐 도입하게 된다. 인천국제공항은 서비스수준협약을 통해 서비스 수준에 영향을 미치는 복합적인 요인을 효율적으로 관리하고 지속적인 서비스 품질수준을 유지하고자 도입한 것이다. 그러나 대부분의 서비스수준협약이 IT 분야에만 집중되어 있어 아직까지는 비(非) IT 분야의 서비스수준협약 시행은 초기 단계이며 서비스수준협약 측정지표 선정에 관한 연구는 매우 부족한 상태이다. 본 연구에서는 현재 인천공항에서 운영 중인 서비스수준협약을 유사용역 그룹별로 구분하여 구성요소와 역할에 대해 파악하고자 하였으며 서비스수준협약 측정지표가 공항운영 효율성에 어떠한 영향을 미치는지 확인하고자 하였다. 연구결과 서비스수준협약 측정지표의 명확성, 적정성, 업무 통제 가능성은 과업운영의 효율성에 유의미한 것으로 나타났으며, 현재 인천공항에서 운영 중인 서비스수준협약 평가 결과에 대한 인식이 과업 운영의 효율성에도 유의미한 것으로 나타났다. 또한 현행 서비스수준협약 평가 결과에 따라 과업의 문제점이 반영되는지 여부와 과업운영의 효율성 간의 상관관계 분석결과 통계적으로 유의한 것으로 분석되고 있다.

• 한국HCI학회:학술대회논문집
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• 2008.02a
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• pp.292-297
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• 2008

유비쿼터스 컴퓨팅 서비스 환경은 사용자와 시스템간의 상호작용성이 매우 중요하며, 이러한 상호작용성을 사용자 중심의 시각에서 평가하기 위한 새로운 평가 기법의 개발이 필요하다. 본 연구는 유비쿼터스 서비스의 특성이 반영된 사용자 중심의 상호작용성 평가 metric 개발을 목표로 한다. 이를 위하여 첫째, 기존의 유비쿼터스 서비스 평가방법론을 검토하여, 유비쿼터스 서비스 평가를 위한 평가 속성을 정의하였으며, 둘째, 대인 서비스 평가기법, 사용성 평가기법, 정신측정학 기반의 평가기법 등의 기존의 서비스 평가방법론의 한계를 극복할 수 있는 사용자중심의 상호작용성 평가 metric 을 개발하였다. 그리고 본 연구에서 제안된 평가 metric 을 u-home 서비스의 평가에 실제로 적용하여 그 유효성을 검증하고 각 지표별 중요도를 구해보았다. 본 연구에서 제안한 상호작용성 평가 metric 은 유비쿼터스 서비스 상호작용성 수준을 평가함으로써 잠재 서비스 사용자들을 분석하고, 제안된 프레임워크의 서비스 개발단계에서의 잠재 서비스 사용자에 대한 요구사항 수렴 및 수준 파악에 유용하게 활용될 수 있다.

• 한국ITS학회:학술대회논문집
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• 2008.11a
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• pp.193-198
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• 2008

• Journal of Korean Society of Transportation
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• v.23 no.2
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• pp.151-160
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• 2005

In case of public transit such as bus system, the probability concept is used to evaluate the Level-of-Service of the operations. And each levels could be classified according to the linear probability value. (TCQSM: Transit Capacity and Quality of Service Manual-2nd Edition, TRB, Washington DC., 2003) In this case, the drivers or passengers wouldn't think that the service level isn't equivalent to the linear probability value. Thus the linear probability value doesn't exactly reflect the service level. This study shows the problems of using the linear probability value in classifying the service level through the case of evaluation of bus operation's punctuality, presented in TCQSM. To make up for the problems of such case, two methodologies are presented in this study. The method of determining Level-of-Service criteria using probability density of headway variation's distribution, presented in this paper, adequately reflects passenger's expected waiting time. According to the application result to real bus operation data, it tis better than the method of TCQSM to evaluate the reliability of bus operations. However further research about the relations between utility difference and passenger feeling of service level in necessary to apply the method that uses the utility function. It remains as the limitation of this paper.

• Journal of Korean Society of Transportation
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• v.29 no.6
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• pp.85-93
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• 2011

The width of sidewalk is one of the important factors constructing a pleasant pedestrian environment. The procedure for sidewalk width design based on the Level of Service is suggested in Korea Highway Capacity Manual. However, this manual does not give a difference between the sidewalk on the street with the passage of the subway, therefore, the different flow characteristic of these places is not appropriately reflected. Though the pedestrian flow in the subway encounters a frequent stop and go situation as like the platoon of vehicles, the similar condition is rarely observed at the urban streets. The new measure of LOS for sidewalk is in need. The study reviewed the prominent measure of LOS and carried out the outdoor experiment to evaluate the new measure. Particularity, GPS was used to collect the pedestrian foot path trajectory for the quantitative evaluation and the results from quantitative and qualitative are compared.

• Journal of the Korean Society for information Management
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• v.35 no.4
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• pp.51-75
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• 2018

This study was intended to confirm the perception of the users for the public libraries specialized service through the difference in library service quality according to the availability of specialized services by utilizing 'LibQUAL+' that is a service quality assessment tool. As a results, there is difference in the minimum and perceived levels between libraries that provide assessment result specialized services for service levels and those that did not. And there was no difference in the expected level. The degree of service showed generally higher user perception in the Adequacy Gap and Superiority Gap than libraries that do not offer specialized services. Therefore, the users of public libraries recognize that libraries that offer specialized services are better served than libraries that do not.