This is the 10222nd most frequent Korean word.
광양제철소에서
"At Gwangyang Steelworks."
In this sentence, '광양제철소에서' (at Gwangyang Steelworks) indicates the location where the action of working takes place.
광양제철소에서 일하고 있습니다.
I am working at Gwangyang Steelworks.
Here, '광양제철소에서' (made at Gwangyang Steelworks) specifies the origin or production place of the steel products.
광양제철소에서 만든 철강 제품은 품질이 높습니다.
Steel products made at Gwangyang Steelworks are of high quality.
In this usage, '광양제철소에서' (held at Gwangyang Steelworks) denotes the location where the seminar took place.