• Journal of Distribution Science
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• v.10 no.5
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• pp.45-55
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• 2012

In Korea, the parcel delivery service was launched officially in 1992, and the market has grown to 13.2 billion units, or 3.5 trillion won, as of 2011. The service companies accept small packages under 30 kg and deliver them on the next day in most domestic areas. This service plays an important role in business and personal activities. The parcel service companies have themselves designed the tariff for the delivery service based on two criteria: weight and the sum of three side lengths. Further, the tariff is graded in steps of three or four rate structures based on size (small, medium, large, and extra-small). However, the basic freight rate is generally decided according to the cargo's weight or measurement size, and an extra rate is added according to some factors (handling, stowability, liability, and so on). The parcel service tariff adopted by the companies is illogically designed, and this study was carried out to assess the need for redesigning the tariff structure. The cargo volume cannot be logically reflected by three side lengths. For example, two parcels measuring 160 cm based on three side lengths may have different volumes, one measuring 0.152 cbm (53.33 cm × 53.33 cm × 53.34 cm) and the other 0.05 cbm (100 cm × 50 cm × 10 cm). A small package of less than120 cm (sum of three side lengths) may have a volume of as much as 0.064 cbm (40 cm × 40 cm × 40 cm). Sample comparison showed that 17% of medium-size parcels (based on the sum of three side lengths) are small-volume packages, 24% of large-size parcels are small- or medium-volume packages, and 40% of extra-big-size parcels are big- or under-size packages. Therefore, if parcel service companies rate their services for volume cargo based on the three side lengths standard, users may have to pay higher than normal rates, particularly because a large percentage of parcels are volume cargo. According to this study, the average weight per 1 cbm is less than 300 kg. Therefore, users face an increasing risk of paying higher than logical freight charges. Generally, transportation companies are called "public interest enterprises," and parcel service companies operate as postal services. Public interest enterprises must provide the delivery service to all customers without discrimination at a reasonable service level and logical service charges. Therefore, parcels service tariffs must be designed and adopted logically. In this study, freight theories and prior research findings were used to consider the importance of freight rates, and distortion of parcel service rates based on the three side lengths system was verified through regression analysis of a parcel sample and sample comparison. In conclusion, volume sizes based on three side lengths have a higher correlation to the rate level than does the sum of three side lengths. Further, compared to the sum of three side lengths, volume size has a higher correlation to cargo weight, which is the most basic factor determining transportation cost. Therefore, the existing parcel service tariff should be changed to weight- and volume-based rates, and the tariff must be graded in steps of 8 to 10 higher rate structures for a logical freight schedule based on service cost.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.36 no.10B
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• pp.1192-1199
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• 2011

The purpose of this paper is to test empirically whether the sunk cost fallacy occurres or not under the two-part tarriff and to give the desirable rate-making for minimizing sunk cost fallacy. According to the results of analysis highly paid monthly fee makes more traffics over the level of optimal consumption because of sunk cost fallacy. Therefore monthly fee reduction will cause the optimal consumption that is near the solution of their own utility function.

• Journal of Korean Society of Transportation
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• v.20 no.7
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• pp.135-142
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• 2002

본 연구에서는 2개의 사례지구에 대한 설문조사를 통해 서비스평가 구조모형을 개발하였다. 모형의 가설로서 요인분석과 신뢰성 분석 등을 통해 구성된 '질적서비스에 대한 인식', '이동성에 대한 인식 '환승에 대한 인식', '경제성에 대한 인식'이란 인지서비스(Perceived service)를 나타내는 4개의 잠재변수는 '개인속성'과 '교통특성'이란 잠재변수의 영향을 받으며, 상호 구조적인 관계를 가지고 전반적인 만족도로 대표되는 '서비스평가'에 영향을 미친다고 가정한다. 모형추정결과, 기초적합지수(GFI)가 상인·월성 0.864, 지산·범물 0.807로 나타났고, 조정 적합지수 (AGFI)는 상인·월성 0.823. 지산·범물 0.759로 나타나 적합성은 대체로 양호하다고 할 수 있다. 또한 두 지역 모두에 있어서 잠재변수 간이나 잠재변수와 관측변수간의 인과계수의 유의성도 2, 3개의 인과계수를 제외하면 모두 5% 유의수준에서 유의한 것으로 나타나 전체적으로 모형이 타당하다고 판단된다. 상인·월성의 경우, 운전기사에 대한 인식치가 '서비스평가'에 미치는 영향력이 가장 크며, 요금수준과 더불어 직접적으로 '서비스평가'에 영향을 미치고 있다 기타 편리성, 쾌적성, 시설 및 운영성이 중요한 원인으로 작용하고 있다는 것을 시사하고 있다. 지산·범물의 경우, 쾌적성, 시설 및 운영성, 편리성이 '서비스평가'에 직접적으로 큰 영향력을 미치고 있다. 특히 이러한 '질적서비스에 대한 인식'은 버스의 현행 요금수준과 대기시간에, 그리고 유의성이 높다고 할 수 없지만 이용자의 연령과 버스이용빈도에 영향을 받고 있는 것으로 나타났다.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.225-228
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• 2021

최근 모바일 비디오 스트리밍 서비스의 이용자 수가 증가하고 있다. 이에 따라 모바일 환경에 적합한 DASH 비디오 스트리밍 메커니즘이 연구되었고, 이것을 DQN 기법에 의해 개선한 알고리즘은 모바일 네트워크 환경에서 적절한 비디오 품질 선택을 통해 버퍼링을 크게 줄일 수 있었다. 그러나 이는 모바일 요금제로 비디오 스트리밍 서비스를 이용하는 사용자들에게 안정적인 서비스를 제공하기 어렵다. 이에 본 논문은 기존의 DQN 기법에 의한 알고리즘을 발전시켜 사용자의 모바일 요금제에 적합한 비디오 품질을 선택하는 알고리즘을 연구하고 성능 실험 결과를 분석한다. 또한 이 알고리즘을 전체 모바일 비디오 스트리밍 시스템과 통합하여 이용하도록 제안한다.

• Journal of Korean Society of Transportation
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• v.30 no.4
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• pp.71-81
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• 2012

The Korean government has actively accepted private investments in building expressways to improve its financial status. As of 2012, 422km of 9 private expressways are under operation, and until 2016 additional 15 are planned to be built with private investments. However, on average, each private expressway is at most 37km long, which works against economies of scale in maintenance and thus leads to inefficiencies such as traffic jams, driver inconveniences, and the increase in operating costs. To resolve these problems, the present study suggested that the maintenance and tolling system should be unified across each private operator. Unifying the operation of private expressways was expected to reduce user travel times and tolls, and save operator maintenance costs. These economic effects were expected to be tantamount to hundreds of billions of dollars. The shared toll collecting system will also reduce user's delays by removing main line tollgates. This can save another hundreds of billions of dollars by ensuring driver's convenience and safety.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.1
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• pp.52-65
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• 2016

The electronic toll collection system(ETCS), is globally used in about 40 countries. In Korea, the Korea Expressway Corporation led the nationwide introduction of the ETC system in 2007 under the brand name of the Hi-pass. Since then, Hi-pass, with its rate of average daily use reaching about 70%, has become an essential facility in Korean expressways. To identify users' perception on Hi-pass (satisfaction, preference, etc.), this study conducted a Modified Importance-Performance Analysis (M-IPA). With this, this study attempted to identify the kind of efforts necessary to enhance current Hi-pass users' convenience and satisfaction. According to the result of M-IPA, the items including "non-stop payment" and "toll discount" are identified as key items that require further improvement. For improvement in the "non-stop payment" item, operations of Hi-pass toll booths appropriate for the demand for Hi-pass use and the selection of Hi-pass booths' locations in consideration of entry and exit lanes need to be improved. In addition, with regard to the "toll discount" item, although toll discount is currently provided to Hi-pass users, thus, PR thereof will have to be strengthened. It is expected that this study will be used as basic data to devise methods of enhancing Hi-pass usage through improvement of Hi-pass users' satisfaction.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2000.05a
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• pp.43-49
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• 2000

That modem society is an information society, information society has placed a high value on information and knowledge. Therefore, modem civilization depends largely on information and knowlege so the most valuable sources of all intelligence activities. This paper was studied on the new developmental direction for intelligent network service. The results of this study is as follow: first, intelligent network service must be systematic development. Second, intelligent network service must be promoted, presenting the development and establishment direction in future society. Third, intelligent network service must be able to unify ail the networks. Fourth, intelligent network service must be development for customers. Fifth, the cost of intelligent network service is determined by Telecommunication Reguration Commission. Sixth, the number system of intelligent network service must be accomplished by number system for future

• Journal of Korean Society of Transportation
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• v.25 no.5
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• pp.101-109
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• 2007

Two variations of toll roads exist: mainline toll plazas and entry/exit tolls. On a mainline toll system(open toll scheme), all vehicles stop at various locations along the highway to pay a toll. While this may save money from the lack of need to construct tolls at every exit, it can cause lots of traffic congestion, and drivers could evade tolls by going around them. With entry/exit tolls, vehicles collect a ticket when entering the highway, which displays the fares it will pay when it exits, increasing in cost for distance travelled. Upon exit, the driver will pay the amount listed for the given exit. The pressures on the Seoul ring roadway network have been changing over time. In the past, the emphasis was on mobility and maintenance of the road network to provide an efficient transportation network, but recently, road use has outstripped the network's ability to extend and expand the road network and hence the policy emphasis has moved towards reducing free riders rather than mitigating its effects. In addition to this pressure is an incidental pressure, which argues that provision of free ride segments generates further traffic in isolation of other factors. This paper is examining policies to reduce the burden of traffic congestion in Seoul ring roadway which is used open toll scheme for decades. One key mechanism to achieve this policy aim is automatic charging mechanism on freeway, but if a nation-wide electronic toll collection is to be implemented successfully, there are a number of prerequisites which must be place.

• Journal of Korean Society of Transportation
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• v.28 no.1
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• pp.51-61
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• 2010

The main objective of this paper is to analyze change of travel patterns according to public transportation reform. The paper uses data collected from Gyeongsan City. So far few researches, especially using before-and-after individual travel survey, have been conducted on analyzing effects of public transportation reform. For this research, some descriptive statistical analyses and statistical hypotheses tests were conducted. Furthermore, some empirical logit models were estimated for analyzing the individual effects of the public transportation reform. Finally, some important foundings, policy implications, and limitations of this research are discussed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.6
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• pp.1454-1461
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• 2014

This study analyzes the influence of the logistics quality of Chinese internet shopping mall on the customer satisfaction. This study also analyzes the influence of the customer satisfaction on the word-of-mouth intention. Then this study examines whether there is a difference among the influences of the logistics quality on the customer satisfaction depending on the types of shopping mall and the users' traits. As a result, when it comes to the logistics quality, carriage, after service and kindness influence customer satisfaction and the customer satisfaction influences word-of-mouth intention similarly. And this research reveals that the logistics quality can not differently influence on the customer satisfaction depending on the types of shopping mall and the users' gender and ages.