Thursday, June 28, 2012

Vessel Management System - Spreadsheet Prototype

I start this project by make a prototype using spreadsheet. I divide it into 2 parts, those are ship scheduling and inventory management. Figure 1 below show how I visualize the ship movement. In fig 1 below there are 3 ship (1,2,3), 2 loading port (B,D), 2 discharge port (A,C), 4 ship activity (anchorage, sailing, discharge, loading), load or discharge quantity, and date (planning horizon). 
Figure 1. Gantt Chart Ship Activity

The second part is inventory management which is show in fig 2 below. There are four part in inventory management, those are port name, daily stock movement, and initial stock. The red color in row “out” show the forecast in that day while the black color show the actual volume out from the storage. Using formula “sumifs” I can link the ship scheduling & inventory management so that it can automatically calculate the daily stock every day.
Figure 2. Inventory Management

Finally to notify the officer at discharge point and simplify the planning visualisation I make a chart which show in fig 3. There are four part in that chart represent the safety stock (blue line), storage capacity (red line), planned incoming ship (green column), and daily stock (purple line). The unlabelled column represent the delivery using land transportation which is truck.   
Figure 3. Inventory Management Chart

Okay, enough for tonight because I have to work tomorrow. This part isn't complete yet and I am going to complete it tomorrow. Good night guys. J

Wednesday, June 27, 2012

Vessel Management System - First Step

Hi guys..This is my first blog, my first article!!Really happy can share my experience here. I hope my english is good enough to share it to you. Oke let’s go. Here you go.

Currently I am working on one of Multi-Companies in Indonesia. Let’s call it "A", hahahahaha. Nowadays “A” is growing faster, both the market area and the organization. In Indonesia, if you want to larger the market you have to think the strategy in term of supply chain. Why? If you sea Indonesia Map, it will show you vast sea with many islands there. Thus “A” must be think about sea distribution using ship to distribute their product from production point to consumption point.

That what I face now. I have to manage several ships to maintain stock level at number of consumption point.
Source:  (Christiansen, 2007)
Fig. 1. The inventory level at port 3 during the planning horizon

Fig. 1 describe my job now. I have to fulfill the stock before its level touch the safety stock level. Imagine you have 8 ship with 3 loading port (production point) and 7 discharge port (consumption point), your brain will act like computer. I have to calculate several possible combination, choose the best one and do this everyday. Hufff, that really exhausting.

That’s why I propose this project to my manager:

Vessel Management System.
A Computer Based Decision to Manage Inventory & Ship Scheduling.

To make it simple I give the executive summary below.

Thanks to researchers who already work in this field. By reading their reports I know what I will face and how to manage it. Hereunder some references that are used:

§  Christiansen, M., & Fagerholt, K. (2009). Maritime Inventory Routing Problems. Encyclopedia of Optimization , 1947-1954.
§  Christiansen, M., Fagerholt, K., Flatberg, T., Haugen, Ø., Kloster, O., & H. Lund, E. (2008). Maritime inventory routing with multiple products: A case study from the cement industry. Elsevier .
§  Christiansen, M., Fagerholt, K., Nygreen, B., & Ronen, D. (2007). Maritime Transportation. Handbooks in Operations Research and Management , 14, 189–284.
§  Fagerholt, K. (2002). A Computer-Based Decision Support System for Vessel Fleet Scheduling-Experience and Future Research. Elsevier .

OK, enough for today. I’ll continue it tomorrow.See yaaa..

Saturday, June 2, 2012