• 품질경영학회지
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• 제40권1호
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• pp.88-91
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• 2012

Joint optimization of preventive age replacement and inventory policy is considered in this paper. There are three decision variables in the problem: (i) preventive replacement age of the operating unit, (ii) order quantity per order and (iii) reorder point for spare replenishment. Preventive replacement age and order quantity are jointly determined so as to minimize the expected cost rate, and then the reorder point for meeting a desired service level is found. A numerical example is included to explain the joint optimization model.

• 산업경영시스템학회지
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• 제33권2호
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• pp.170-175
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• 2010

Maintaining a complex repairable system can be achieved by repairing, replacing, or any other activities. This paper proposes a joint optimization policy that is composed with ordering and replacing under minimal repair for the complex system. For this purpose, we derive the expected cost due to the minimal repair, ordering, downtime, inventory costs, and salvage value of units that follow generally distribution. Some properties about the optimum ordering policy that are suggested for our purpose shows that the optimum ordering policy minimizing the expected cost is either one of the two typical policies : (1) the original unit is replaced as soon as the ordered spare is delivered, or (2) the delivered spare is used as inventory part until the original unit fails.

• Archives of Plastic Surgery
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• 제50권5호
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• pp.501-506
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• 2023

This article portrays the authors' experience with a complex lower limb bone and soft tissue defect, following chronic osteomyelitis and pathological fracture, which was managed by the multidisciplinary orthoplastic team. The decision for functional amputation versus limb salvage was deemed necessary, enhanced by the principles of "spare parts" in reconstructive microsurgery. This case describes the successful use of the osteocutaneous distal tibia turn-up fillet flap that allowed "lowering the level of the amputation" from a through knee to a below-knee amputation (BKA) to preserve the knee joint function. We comprehensibly review reports of turn-up flaps which effectively lower the level of amputation, also applying "spare-parts" surgery principles and explore how these concepts refine complex orthoplastic approaches when limb salvage is not possible to enhance function. The osteocutaneous distal tibia turn-up fillet flap is a robust technique for modified BKA reconstructions that provides sufficient bone length to achieve a tough, sensate stump and functional knee joint.

• 한국산업융합학회 논문집
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• 제23권2_2호
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• pp.289-299
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• 2020

The composition of convergence cross-section of the material is a technique that provides reasonable design and construction of structures. It is frequently used in medium-sized bridges and architectural structures. However, the structural behavioral spare capacity enhancement of the structure by the application of the convergence cross-section is still limited by the expandability due to the limiting state of each material. In order to overcome these limitations, this study reasonably analyzed the construction stages before and after the convergence cross-section constructed and developed a technique for forming multi-point boundary conditions using struts, which are compression members. Based on the existing cases, a reasonable construction step for forming the material composite section of the entire structural system of the structure was derived, and a numerical analysis model for a specific part was constructed to analyze the behavior of the strut application. As a result of this study, the effect of reducing the sectional force of 7.40% in beam-column joint and 6.31% in the center of girder was derived, and the deflection, which is a measure of the serviceability of the structure, improved by 54.41% from the installation and dismantling of strut members at each construction stage.

• 디자인학연구
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• 제12권2호
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• pp.31-40
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• 1999

급격한 산업화로 인한 핵가족화, 맞벌이 부부의 증가 등으로 우리나라에서는 인간의 성장에 있어 중요한 시기인 유아시기의 부모, 온 집안이나 마을 공동체가 함께 키우던 육아 전통의 바탕이 무너져 버렸다. 일하는 엄마들은 아이를 스스로 양육하지 못하는 것으로 스트레스를 받고 전업 주부들도 육아에 자신감이 없고 아버지들은 육아의 책임을 면제받는 대신 아이들과 가정으로부터 소외된다. 따라서 자녀 양육의 문제를 해결하기 위해 보편적이고 포괄적인 보육 제도를 만들어야 한다. 이러한 문제를 해결하고 바람직한 육아와 교육을 위해서 부모들의 자발적인 참여를 통한 보호와 생활, 교육, 나아가 학교 교육을 보완할 수 있는 공동육아가 대안적으로 마련되어 왔다. 공동육아는 기존 보육 제도와는 달리 조합원들이 출자금을 내어 주민 자치적으로 운영할 뿐 아니라 어린이들이 자연의 생명력을 직접 체험하게 하고자 한다. 따라서 기존의 보육 제도를 위한 환경. 시설의 기준과는 다른 공동 육아에 적합한 환경디자인에 대한 기준 마련이 필요하다. 본 연구에서는 유아 교육의 개념이 시대 변화에 따라 어떻게 변화하고 있는가를 파악하기 위해 이태리와 스웨덴에서 성공적으로 행해지고 있는 유아 교육의 개념 및 공동육아의 개념을 문헌 조사를 통해 정립하였다. 또한 물리적 환경조성을 위한 기본 원칙과 실제적인 환경디자인을 위한 공간 구성과 환경 조건을 문헌조사 하였다. 그리고 공동육아의 개념과 특성 및 물리적 환경 제안을 조사.정리한 후 공동육아 환경디자인의 개념과 기준 및 디자인 요소를 설정하였다. 마지막 결론으로 공동육아를 위한 환경디자인의 디자인지침을 제시하였다.

• 한국공간구조학회논문집
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• 제14권3호
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• pp.101-108
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• 2014

Recently, natural disasters such as earthquake, tsunami, typhoon and tornado are increasing, and cause huge economical loses and victim. Thus, when the disaster occurs, it is important to prepare emergency evacuation shelters for fast and easy construction compared to general building system. And, deployable structures will provide a great help for such aim. Deployable structures have the great advantage of being faster and easier to erect and dismantle compared to conventional building forms. In this study, we confirm the possibility of deployment for shelter structures using scissor structure system. First, Basic model was performed to recognize the appllicability of the deployable systems of the dome-shaped structure. Second, Advanced model that more improved inner space and deployment mechanism was confirmed.