• Title/Summary/Keyword: production planning %26 scheduling

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Integrated Order Scheduling with Limited Production Capacity of Multiple Producers in Distribution Requirement Planning Systems ( DRPs ) (DRP 시스템에서 생산지의 생산능력을 고려한 통합발주계획)

  • Yoo, Yeong-Joon;Rhee, Jong-Tae
    • Journal of Korean Institute of Industrial Engineers
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    • v.26 no.1
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    • pp.17-26
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    • 2000
  • This paper presents an integrated order scheduling method with the improved DRP concept for multi-echelon distribution system that has the constraint of limited production capacity of producers. The proposed method reflects the dynamic characteristics of inventory level changes in the regional and central distribution center. The simulation is done with two models : the traditional DRP method and the proposed method presented in this paper. From the results, the latter is more efficient than the former in cost, customer's service level as well as balanced production load on each producer.

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A Production-and-Scheduling for One-Vendor Multi-Buyer Model under the Consolidation Policy (다수 고객 통합전략을 활용하는 생산 및 물류계획 수립)

  • Noh, K.W.;Sung, C.S.;Lee, Ik Sun
    • Korean Management Science Review
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    • v.31 no.3
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    • pp.13-26
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    • 2014
  • This paper considers an integrated one-vendor multi-buyer production-inventory model where the vendor manufactures multiple products in lot at their associated finite production rates. In the model, it is allowed for each product to be shipped in lot to the buyers even before the whole product production is not completed yet. Each product lot is dispatched to the associated buyer in a number of shipments. The buyers consume their products at fixed rates. The objective is to the production and shipment schedules in the integrated system, which minimizes the total cost per unit time. The total cost consists of production setup cost, inventory holding cost and shipment cost. For the model, an iterative optimal solution procedure with shipment consolidation policy incorporated. It is then tested through numerical experiments to show how efficient and effective the shipment consolidation policy is.

Structuring of BOM and Routings for CIM System In Make to Order Environments -Application of CIM System for Ship Production- (수주생산 환경에서의 CIM 시스템을 위한 BOM과 라우팅의 구조화 -조선산업 사례 중심-)

  • Hwang, Sung-Ryong;Kim, Jae-Gyun
    • IE interfaces
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    • v.15 no.1
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    • pp.26-39
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    • 2002
  • Two key data areas of the integrated production database in computer-integrated manufacturing (CIM) systems are the product structure in the forms of bills of material(BOM) and the process structure in the forms of routings. The great majority of existing information systems regard the BOM and routing as two separate data entities, possibly with some degree of cross-referencing. This paper proposes new information structure called the bills of material and routings(BMR) that logically integrates the BOM and routings for the CIM systems in ship production. The characteristics of ship production are described as: 1) make-to-order production type, 2) combined manufacturing principles (workshop production and construction site production), 3) significant overlapping of design, planning and manufacturing, 4) very long order throughput time, 5) complex product structure and production process. The proposed BMR systematically manages ail parts and operations data needed ship production considering characteristics of ship production. Also, the BMR situated on the integrated production database more efficiently supports interface between engineering and production functions, and integrates a wide variety of functions within production such as production planning, process planning, operation scheduling, material planning, costing etc., and simplifies information flow between sub-systems in CIM systems.

An Efficiency Analysis for Total Work Scheduling (총합적 작업일정계획의 합리화 및 효율분석)

  • 신현표
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.10 no.16
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    • pp.19-26
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    • 1987
  • Since many small and medium sized enterprises have lack of funds to install the full scale Computer Aided Process Planning this study has been attempted to develop a part of computer generated production information system for a start. The system is programmed by DBASE III and BASIC languages for the IBM-PC competables for the sake of user's convenience. The system consisted of four major parts. The first part is a computerized work measurement system for applying WF predetermined time standards. The second part is a computerized forecasting and loading system for applying various statistical techniques. The third part is a GT scheduling system programmed by BASIC for applying heuristic scheduling method. Finally, the last part is a simulation system for GT scheduling efficiency test which is programmed by SIMAN simulation language.

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Mathematical Model of Aquaculture Facility Utilization (양식장 이용에 대한 수학적 모형)

  • Eh, Youn-Yang
    • Journal of Fisheries and Marine Sciences Education
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    • v.26 no.2
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    • pp.444-454
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    • 2014
  • The range of optimization problem in aquaculture is very wide, resulting from the range of species, mode of operation. Quite a few studies focus marine net-cages, but studies on land based culture farm are few or no. This paper considers a allocation problem to meet production planning in land based aquaculture system. A water pool allocation model in land based aquaculture system was developed. The solution finds the value of decision variable to minimize yearly production costs that sums up the water pool usage cost and sorting cost. The model inputs were (1) the fish growth rate (2) critical standing corp (3) number of water pool (4) number of fish. The model outputs were (5) number of water pool in growing phase (6) cost of cultivation (6) optimal facility allocation(number of water pool for each growing phase). To solve the problem, an efficient heuristic algorithm based on a greedy manner is developed. Branch and bound and heuristic is evaluated through numerical examples.

Implementation and Applications of Simulation Based Digital Shipyard (시뮬레이션 기반 디지털 조선소 구축 및 활용)

  • Han, Sang-Dong;Ryu, Cheol-Ho;Shin, Jong-Gye;Lee, Jong-Kun
    • Korean Journal of Computational Design and Engineering
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    • v.13 no.1
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    • pp.18-26
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    • 2008
  • Shipbuilding industries have been struggling to reduce production time and cost of their products in many aspects. Manufacturing systems have been changed, new production lines and robots have been installed, and new planning and scheduling systems have been adopted in order to achieve shorter time-to-market and higher productivity. Simulation based manufacturing, digital manufacturing, or virtual manufacturing simulation, whatever the name means, is an approach to achieve such a goal. In order to improve productivity in a shipbuilding process at a shipyard, a digital shipyard development has been driven. This paper proposed how to implement the digital shipyard, what to do with it, and what to obtain from it. This digital shipyard will help simulate and optimize the entire shipbuilding life cycle with its virtual environment through shipbuilding process from the initial development stage to the launch.

A Study on the Development of Multifunctional Sofa System Design for the Elderly Living Alone - Focused on the Physical and Mental Characteristics - (독거노인을 위한 다기능 시스템 소파 디자인 개발 - 신체적, 심리적 특성을 중심으로 -)

  • Kim, Myunghee;Kim, Hwikyung;Lee, Jonghee
    • Journal of the Korea Furniture Society
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    • v.28 no.1
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    • pp.16-26
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    • 2017
  • In today's aging society, stable residential environment is essential for the elderly living alone to be able to do activities of daily living without restrictions and cherish a satisfactory quality of life. We developed a safe and convenient multifunctional sofa by removing complex combinations and decomposing processes of the multifunctional transformable furniture, appropriate for the use by elderly living alone. We deduced the 4 main keywords and details related to the purpose of sofa by analyzing the users' physical and mental characteristics through literature review and by using 24-hour scheduling, interviews, and actual measurement. Finally, by applying this to furniture planning, we designed 4 different types of multifunctional sofa system. Production was done in cooperation with AND Co. for 2 weeks using materials, colors and adhesives selectively chosen with careful consideration of their effects on the physical, mental aspects of the user to give optimal comfortability.

Performance of Drip Irrigation System in Banana Cultuivation - Data Envelopment Analysis Approach

  • Kumar, K. Nirmal Ravi;Kumar, M. Suresh
    • Agribusiness and Information Management
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    • v.8 no.1
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    • pp.17-26
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    • 2016
  • India is largest producer of banana in the world producing 29.72 million tonnes from an area of 0.803 million ha with a productivity of 35.7 MT ha-1 and accounted for 15.48 and 27.01 per cent of the world's area and production respectively (www.nhb.gov.in). In India, Tamil Nadu leads other states both in terms of area and production followed by Maharashtra, Gujarat and Andhra Pradesh. In Rayalaseema region of Andhra Pradesh, Kurnool district had special reputation in the cultivation of banana in an area of 5765 hectares with an annual production of 2.01 lakh tonnes in the year 2012-13 and hence, it was purposively chosen for the study. On $23^{rd}$ November 2003, the Government of Andhra Pradesh has commenced a comprehensive project called 'Andhra Pradesh Micro Irrigation Project (APMIP)', first of its kind in the world so as to promote water use efficiency. APMIP is offering 100 per cent of subsidy in case of SC, ST and 90 per cent in case of other categories of farmers up to 5.0 acres of land. In case of acreage between 5-10 acres, 70 per cent subsidy and acreage above 10, 50 per cent of subsidy is given to the farmer beneficiaries. The sampling frame consists of Kurnool district, two mandals, four villages and 180 sample farmers comprising of 60 farmers each from Marginal (<1ha), Small (1-2ha) and Other (>2ha) categories. A well structured pre-tested schedule was employed to collect the requisite information pertaining to the performance of drip irrigation among the sample farmers and Data Envelopment Analysis (DEA) model was employed to analyze the performance of drip irrigation in banana farms. The performance of drip irrigation was assessed based on the parameters like: Land Development Works (LDW), Fertigation costs (FC), Volume of water supplied (VWS), Annual maintenance costs of drip irrigation (AMC), Economic Status of the farmer (ES), Crop Productivity (CP) etc. The first four parameters are considered as inputs and last two as outputs for DEA modelling purposes. The findings revealed that, the number of farms operating at CRS are more in number in other farms (46.66%) followed by marginal (45%) and small farms (28.33%). Similarly, regarding the number of farmers operating at VRS, the other farms are again more in number with 61.66 per cent followed by marginal (53.33%) and small farms (35%). With reference to scale efficiency, marginal farms dominate the scenario with 57 per cent followed by others (55%) and small farms (50%). At pooled level, 26.11 per cent of the farms are being operated at CRS with an average technical efficiency score of 0.6138 i.e., 47 out of 180 farms. Nearly 40 per cent of the farmers at pooled level are being operated at VRS with an average technical efficiency score of 0.7241. As regards to scale efficiency, nearly 52 per cent of the farmers (94 out of 180 farmers) at pooled level, either performed at the optimum scale or were close to the optimum scale (farms having scale efficiency values equal to or more than 0.90). Majority of the farms (39.44%) are operating at IRS and only 29 per cent of the farmers are operating at DRS. This signifies that, more resources should be provided to these farms operating at IRS and the same should be decreased towards the farms operating at DRS. Nearly 32 per cent of the farms are operating at CRS indicating efficient utilization of resources. Log linear regression model was used to analyze the major determinants of input use efficiency in banana farms. The input variables considered under DEA model were again considered as influential factors for the CRS obtained for the three categories of farmers. Volume of water supplied ($X_1$) and fertigation cost ($X_2$) are the major determinants of banana farms across all the farmer categories and even at pooled level. In view of their positive influence on the CRS, it is essential to strengthen modern irrigation infrastructure like drip irrigation and offer more fertilizer subsidies to the farmer to enhance the crop production on cost-effective basis in Kurnool district of Andhra Pradesh, India. This study further suggests that, the present era of Information Technology will help the irrigation management in the context of generating new techniques, extension, adoption and information. It will also guide the farmers in irrigation scheduling and quantifying the irrigation water requirements in accordance with the water availability in a particular season. So, it is high time for the Government of India to pay adequate attention towards the applications of 'Information and Communication Technology (ICT) and its applications in irrigation water management' for facilitating the deployment of Decision Supports Systems (DSSs) at various levels of planning and management of water resources in the country.