Next crucial steps

Do extensive reading on the articles.

Extensive mean you read quickly, normally look on the abstract of the article.

The objective of this activity is to classify which article is suit with your research interest.

Typically, you need to separate the selected articles into another folder. You may named the folder as 'Pilot Ref'.

It is more practical if you dump all the articles into Mendeley.
Use Mendeley search to find your articles.

Open the articles in Mendely, double click an article, read the abstract.  

Journey Begins

How to determine your Research Area

Fix into the heart--> Domain of interest: Industrial Automation

Sub-Domain: Automated Warehouse

Sub-sub-Domain: Automated Storage

Aim System: Automated Storage and Retrieval System (AS/RS)

How to improve or increase the throughput of the system
 
Focused subsystem: Storage and retrieval machine (SRM)



Keywords:

1. Industrial Automation
2. Automated Warehouse
3. Automated Storage
4. Automated Storage and Retrieval System
5. Storage and Retrieval Machine

Use Google Scholar search engine to find paper using keywords above. 
Set the articles that published within range of 3 years time.