• Title/Summary/Keyword: Fleet size

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A Study on the Relationship between National Controlling Fleets and the Managerial Performance of Ship Management Companies in Korea

  • Sang Bae Lee;Chi Yeol Kim
    • Journal of Navigation and Port Research
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    • v.48 no.2
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    • pp.104-108
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    • 2024
  • This study investigates the relationship between national controlling fleets and the managerial performance of ship management companies in Korea. As industries clearly show interrelations between upstream and downstream entities , it is likely that the managerial performance of ship management companies in Korea is affected by the size of national fleet. Therefore, the present study analyzes the impact of Korean fleet size on the growth and the profitability of ship management firms. To this end, the performances of 10 major ship management companies in the period from 2012-2022 are examined through panel data regressions. The results indicate that the size of the national fleet has a positive impact on growth in both the assets and the sales of ship management companies. Specifically, the size of the Korean-flagged fleet is the most crucial factor, while that of the foreign-flagged fleet has no significant effect. In stark contrast to the findings regarding growth, the size of national fleet is found to have no significant impact on the profitability of ship management companies. This study's findings are expected to provide valuable implications informing both the managerial decision-making of ship management companies as well as policy-making for shipping and its related industries.

EVALUATING MANAGEMENT STRATEGIES THROUGH ECONOMIC MODELING OF HEAVY EQUIPMENT FLEETS

  • Tyler Johnson;John Hildreth;Scott Capps
    • International conference on construction engineering and project management
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    • 2013.01a
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    • pp.219-225
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    • 2013
  • State transportation agencies utilize fleets of heavy equipment to construct and maintain roadways. Equipment cost models can be developed to forecast economic life, which is the point at which the average unit cost to date reaches a minimum. A calculated economic life and cost models can be used to quantify the impacts of management strategies applied to a fleet. The purpose of this research was to develop an accurate method of quantifying the results of management strategies applied to a fleet of heavy construction equipment. The strategies evaluated are related to the annual usage of the fleet and the size of the fleet. More specifically the methodology is used to adjust the economic model to consider a limit to the annual decline in machine usage and a reduction in the number of machines in the fleet. When limiting annual machine usage, a specified rate is applied to the usage of the fleet, while total usage is held constant. This causes aging at a modified rate. A reduction in fleet size also causes a change to the usage of a fleet as the fleet must use fewer machines to produce the same total usage.

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Fleet Sizing under Dynamic Vehicle Dispatching (동적 차량배차 환경에서의 차량 대수 결정)

  • Koo, Pyung-Hoi;Suh, Jungdae
    • Journal of Korean Institute of Industrial Engineers
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    • v.28 no.3
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    • pp.256-263
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    • 2002
  • This paper addresses a planning problem in a pickup-delivery transportation' system under dynamic vehicle dispatching. We present a procedure to determine a fleet size in which stochastic characteristics of vehicle travels are considered. Statistical approach and queueing theory are applied to estimate vehicle travel time and vehicle waiting time, based on which an appropriate fleet size is determined. Simulation experiments are performed to verify the proposed procedure.

Determination of the Fleet Size for Container-Road Transportation with Dynamic Demand (동적 수송 요구를 고려한 컨테이너 운송 차량 대수 결정)

  • 양천석;고창성;정기호;신재영
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2001.10a
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    • pp.139-142
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    • 2001
  • This study suggests an approach for determining fleet size for container road transportation with dynamic demand in Korea. With the forecasted monthly container transportation data a year, a heuristic algorithm is developed to determine the number of company-owned trucks, mandated trucks, and rented trucks in order to minimize the expected annual operating cost, which is based on the solution technologies used in the aggregate production planning and the pickup-and-delivery problem. Finally the algorithm is tested for the problem how the trucking company determines the fleet size for transporting containers.

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Analysis of Factors Influencing the Composition of Oil Tanker Fleet of Domestic Refinery Companies

  • Bek, Gihon
    • Journal of Navigation and Port Research
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    • v.27 no.3
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    • pp.289-295
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    • 2003
  • The international oil majors have been reducing the size of their own oil tanker fleet since early 1980s. Like international oil majors, the Korean refineries are becoming more dependent on tanker chartering rather than tanker ownership for their oil transportation since the 1990s. They also prefer spot charter to time charter and this kind of trend has continued up to now. Consequently, this paper attempted to find the factors influencing changes in tanker fleet composition. To attain the object of the paper, an empirical study is adopted using the ten decision-making factors derived from preceeding studies. The findings are that MARPOL and OPA 90, and transportation costs are the most important factors influencing an oil tanker fleet composition.

추계적 작업환경에서 컨테이너 셔틀운송 차량 대수 추정

  • 고창성;김홍배;양성민;박성찬;손경호
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2000.10a
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    • pp.171-174
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    • 2000
  • This paper presents an approach to determine the vehicle fleet size for container shuttle service in a stochastic working environment. The shuttle service can be defined as the repetitive travel between the designated places during working period. The initial number of vehicles is temporarily calculated using the transportation model. Simulation is carried out in order to investigate dynamic behavior of container shuttle. Finally, the equation for estimating the vehicle fleet size is obtained through the multiple regression model based on simulation results.

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Combining Vehicle Routing with Forwarding : Extension of the Vehicle Routing Problem by Different Types of Sub-contraction

  • Kopfer, Herbert;Wang, Xin
    • Journal of Korean Institute of Industrial Engineers
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    • v.35 no.1
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    • pp.1-14
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    • 2009
  • The efficiency of transportation requests fulfillment can be increased through extending the problem of vehicle routing and scheduling by the possibility of subcontracting a part of the requests to external carriers. This problem extension transforms the usual vehicle routing and scheduling problems to the more general integrated operational transportation problems. In this contribution, we analyze the motivation, the chances, the realization, and the challenges of the integrated operational planning and report on experiments for extending the plain Vehicle Routing Problem to a corresponding problem combining vehicle routing and request forwarding by means of different sub-contraction types. The extended problem is formalized as a mixed integer linear programming model and solved by a commercial mathematical programming solver. The computational results show tremendous costs savings even for small problem instances by allowing subcontracting. Additionally, the performed experiments for the operational transportation planning are used for an analysis of the decision on the optimal fleet size for own vehicles and regularly hired vehicles.

On Fleet Sizing and Distribution Policy of Transportation Equipments in Pure Hub-and-Spoke Networks : The Case of Compound Poisson Process (순 방사형 물류체계에서 수송장비의 보유대수 결정과 분배정책 : 복합포아송과정을 따를 경우)

  • 서순근;이병호
    • Journal of the Korean Operations Research and Management Science Society
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    • v.24 no.3
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    • pp.109-123
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    • 1999
  • Fleet sizing and empty equipment redistribution are two of the most critical problems in managing a fleet of equipment over a transportation network. Where the demand pattern followed the compound Poisson process(CPP) which can be generated one or more at a time under homogeneous Poisson process(HPP), this paper presented a mathematical model to determine control parameters of a decentralized distribution policy and fleet size in case of the pure hub-and-spoke system, a popular form of a logistics system. and validated this model by simulation. That is, where the number of demanded equipments followed geometric and binomial distributions, respectively, cost models on the pure hub-and-spoke logistics system with deterministic trans-portation times, which could be solved analytically, were established and analyzed. We also compared the deterministic case with stochastic one that the transportation time follows some probability distributions.

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On Fleet Sizing and Distribution Policy of Transportation Equipments in Hub-and-Spoke Network (방사형 물류체계에서 수송장비의 보유대수 결정과 분배정책)

  • Seo, Sun-Keun;Lee, Byung-Ho
    • IE interfaces
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    • v.11 no.1
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    • pp.55-66
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    • 1998
  • Fleet sizing and distribution of empty equipments are two of the most critical problems in managing transportation system. This paper develops a cost model for sizing a fleet and establishing decentralized redistribution polices of empty equipments by building from inventory theory of multi-echelon system in hub-and-spoke network. An analytical approach to determine control variables of redistribution policies in each terminal and fleet size of the transportation system is proposed and its results are validated by simulation model. Numerical experiments are conducted with respect to parameters of the model and test results for assumptions of the model are discussed.

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A Study on the Relationship between Bus Operation Environment and Level of Service of Intra-City Bus - In the place of Ulsan Metropolitan Area - (시내버스 운행여건과 서비스 수준에 관한 연구 - 울산광역시 사례를 중심으로 -)

  • Kim, Beom-Ryong;Choi, Yang-Won
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.35 no.6
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    • pp.1309-1320
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    • 2015
  • This study made an attempt to analyse the relationship between operation environment and fleet size per route which represents the level of service for inner-city bus service. Regression analysis method has been adopted as main analysis tool and 98 routes of bus operation status in Ulsan city as of 2013 has also been selected for analysis target. Correlation analysis was performed to identify the relationship between dependent and independent variables. There are three types of model for whole sample, type operation, and bus route operation system. These are the results of the current study. 1. The model developed for whole sample of 98 routes is as follows. Y(Fleet Size)=$-4.532+0.00002877*X_1$(Revenue). This model shows that it is necessary to have more than 140 passengers per day to increase fleet size of each bus route in Ulsan. 2. Models developed by type of operation (which are standard, express, and middle sized) are shown below. Stand Bus : Y(Fleet Size)=$-10.954+0.00004283*X_1$(Revenue). It is identified that more than 153 passengers need to use standard bus to increase fleet size per each standard bus, Middle Sized Bus : Y(Fleet Size)=-0.859+0.00001438*X1(Revenue). For middle sized bus, at least 52 daily passengers are needed to increase number of bus in each route. 3. Models developed for each route operation systems are as belows. Joint Operation Group : Y(Fleet Size)=$-4.786+0.00003028*X_1$(Revenue). Individual Operation Group : Y(Fleet Size)=$-2.339+0.00002030*X_1$(Revenue). These model provide similar result which 140 people is the minimum number of passenger to raise the number of vehicles in each route. This result shows that the route operation systems does not affect the raise number of cars significantly.