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전승현,옥영석 한국경영공학회 2007 한국경영공학회지 Vol.12 No.1
The DBR(Drum-Buffer-Rope) method of TOC(Theory of Constraints) achieves the global optimization of unbalanced factory by focusing on the constrained resources. It has widely been recognized as an efficient tool to lower the stock level and shorten the lead time by pursuing a whole profit rather than achieving a local efficiency. The satisfaction of due date is important to the customer especially under the make-to-order environment. Thus, it will be meaningful to apply the DBR method to the make-to-order environment. This paper is to develop the DBR scheduling system and to measure the performance of DBR scheduling system under the make-to-order environment. Firstly, this study introduces the development of DBR scheduling system to make-to-order environment. And the performance of DBR method is evaluated by comparing with the backscheduling method which has widely been used in the make-to-order environment.
A Scalability based Energy Model for Sustainability of Blockchain Networks
전승현,정복래 대한산업경영학회 2023 산업융합연구 Vol.21 No.8
Blockchains have recently struggled to design for the ideal distributed trust networks by solving scalability trilemma. However, local conflicts between some countries lead to imbalance on energy distribution. Besides, blockchain networks (e.g., Bitcoin) currently consume enormous energy for transaction and mining. The existing data volume based trust model evaluated an increasing blockchain size better than Lubin’s trust model in scalability trilemma. In this paper, we propose a scalability based energy model to evaluate sustainability for blockchain networks, considering energy consumption for transaction, time duration, and the blockchain size of growing blockchain networks. Through the rigorous numerical analysis, we compare the proposed scalability based energy model with the existing model for the satisfaction and optimal blockchain size. Thus, the scalability based energy model will provide an assessment tool to choose the proper blockchain networks to solve scalability trilemma problem and prove sustainability.
A Cache Hit Ratio based Power Consumption Model for Wireless Mesh Networks
전승현,서용준 대한산업경영학회 2020 산업융합연구 Vol.18 No.2
Industrial IoT has much interested in wireless mesh networks (WMNs) due to cost effectiveness and coverage. According to the advance in caching technology, WMNs have been researched to overcome the throughput degradation of multihop environment. However, there is few researches of cache power consumption models for WMNs. In particular, a wired line based cache power consumption model in content-centric networks is not still proper to WMNs. In this paper, we split the amount of cache power from the idle power consumption of CPU, and then the cache hit ratio proportional power consumption model (CHR-model) is proposed. The proposed CHR-model provides more accurate power consumption in WMNs, compared with the conventional cache power efficiency based consumption model (CPE-model). The proposed CHR-model can provide a reference model to improve energy-efficient cache operation for Industrial IoT.