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고용수준 안정화를 고려한 연동 계획기간 방식 생산계획 수립 연구
황미령,박경수,김재희 한국경영교육학회 2014 경영교육연구 Vol.29 No.6
Aggregate production planning is essential in determination of the workforce, production, and inventory levels meet fluctuating demand requirements over a planning horizon that ranges from several months to one year. The purpose of this paper is to develop an optimization model for aggregate planning of a production system in which the size of workforce should be stabilized. The model is a mixed integer programming model designed to build a strategic work-force planning and to balance the stock level against the possibility of shortages of product when producing multiple products from several production line. Furthermore, real-time simulation was carried out assuming that historical demands had been occurred in a rolling horizon environment. The results of a case study show that inventory and the associated cost can be reduced compared with the results of the current rule of thumb approach and indicate the usefulness of the proposed model. 중장기 계획기간에 대한 개괄적인 수요 예측치를 토대로 고용수준, 생산, 재고 등에 대한 계획을 수립하는 총괄생산 계획은 생산 계획 초기의 성과를 좌우하는 중요한 일이다. 본 연구에서는 노사 협약에 의해 고용 수준의 안정화가 필요한 상황에서 고용수준과 재고 수준을 결정할 수 있는 총괄생산계획 모형을 개발하는 데 있다. 제시된 모형은 혼합정수계획(Mixed Integer Programming)형태로서, 복수의 생산라인에서 다수의 품목을 생산하는 조건에서 결품 가능성과 재고 발생에 따른 비용을 고려하여 전략적으로 최적의 인력수준과 생산량을 결정할 수 있도록 설계되었다. 총괄생산계획의 성과를 입증하기 위해서 사례 기업을 대상으로 수요 예측치를 이용하여 최적화 모형을 수행한 후, 실제 수요를 반영하여 재고량을 산정하고 다시 새로운 예상 수요를 고려한 최적화를 수행하는, 연동 계획기간(Rolling Horizon)개념 하의 시뮬레이션을 수행하였다. 그 결과, 경험에 의존하던 기존 실적에 비해 재고를 비롯한 전체 비용을 줄일 수 있는 것으로 나타나, 모형의 활용가능성을 확인할 수 있었다.
정중신경의 검사 길이가 수근관 증후군 진단에 미치는 영향
김동휘,강윤규,황미령 대한재활의학회 2004 Annals of Rehabilitation Medicine Vol.28 No.1
Objective: To evaluate the influence of the length of the median nerve in the diagnosis of carpal tunnel syndrome (CTS). Method: Inching test of median sensory nerve using TenElectrodes was performed in 114 hands of 68 CTS patients and 68 hands of 34 controls. The abnormal cut-off values of 1-cm, 2-cm, 3-cm, 4-cm, 5-cm, 6-cm, and 7-cm segment studies were calculated as the maximal conduction delay per centimeter (maximal CD/cm)+SD×2 for each segment in controls. Based on such values, the sensitivity of each segment study in the CTS group and the specificity in controls were obtained. Results: In controls, mean CD/cm was 0.20±0.08 ms, and maximal CD/cm was 0.26±0.08 ms in the segment between 2 and 3 cm distal to distal wrist crease. With the abnormal cut-off value set at 0.26 ms, the sensitivity of the 1-cm segment study was 98.5% in CTS. The sensitivities of the 2-cm through 7-cm segment studies were 93.9%, 93.9%, 92.4%, 92.4%, 92.4%, and 90.9%, respectively. Conclusion: These suggest that studies of longer nerve segments tend to lower the sensitivity of the test because the inclusion of the unaffected segments in calculation attenuates the effect of conduction delay at the site of the lesion.
근막통 증후군을 동반한 특발성 후복막 섬유 증식증-증례보고-
강효정,권유하,황미령 대한재활의학회 2009 Annals of Rehabilitation Medicine Vol.33 No.1
Idiopathic retroperitoneal fibrosis (IRF) is a rare condition in which a mass of fibrous tissue encompasses the abdominal aorta and the common iliac arteries. Although the histologic findings of IRF are mostly benign, its diagnosis is often delayed, leading to significant physiologic deteriorations, namely renal insufficiency, and poor treatment prognosis. Back pain, which is a common presenting symptom, may lead to confusion in determining the diagnosis of IRF. This report presents a patient with retroperitoneal fibrosis whose diagnosis was delayed due to the concomitant presence of myofascial pain syndrome and lumbar intervertebral disc herniation.