Lean manufacturing, lean enterprise, or lean production, often simply, “lean“, is a production practice that considers the expenditure of resources for any goal other than the creation of value for the end customer to be wasteful, and thus a target for elimination. Working from the perspective of the customer who consumes a product or service, “value” is defined as any action or process that a customer would be willing to pay for.
Essentially, lean is centered on preserving value with less work. Lean manufacturing is a management philosophy derived mostly from the Toyota Production System (TPS) (hence the term Toyotism is also prevalent) and identified as “lean” only in the 1990s. TPS is renowned for its focus on reduction of the original Toyota seven wastes to improve overall customer value, but there are varying perspectives on how this is best achieved. The steady growth of Toyota, from a small company to the world’s largest automaker, has focused attention on how it has achieved this success.
Continue reading “Think Lean”
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During the day I switch my VPN connection on and off several times. When I try to hit a server inside my company’s network while the VPN connection is down, it obviously fails and because I’m using OpenDNS every hostname resolves to an ip-address (in this case an ip-address of a server at OpenDNS).
I connect to VPN and then reload the page in Firefox and the same error page shows up. The reason for this behavior is Firefox’s internal DNS cache. The only remedy at that point is to close Firefox and restart it, which clears the in-memory DNS cache.
However, there’s a solution that does not require a restart.
about:config in Firefox’s address bar
- acknowledge the warning that appears next
- find an entry called
network.dnsCacheExpiration and set it’s value to 0
- if there’s no such entry, create a new integer item with the name above and a value of 0
- now go back and change the value to 3600
In step 3 (or 4) we tell Firefox that the expiration time for DNS cache is 0 seconds, which means that cache entries expire immediately, essentially clearing the existing cache. In step 5 we go back to the standard 3600 seconds (1 hr) cache expiration. The net effect of these steps is an empty DNS cache, meaning that the next time you hit the trouble server above, Firefox will attempt to resolve the hostname to an ip-address.