• Title/Summary/Keyword: Burn-In Oven

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Minimization of Total Weighted Earliness and Tardiness on a Single Burn-In Oven U sing a Genetic Algorithm (단일 Burn-In Oven에서 Total Weighted Earliness와 Tardiness를 최소화하기 위한 유전자 알고리즘의 활용)

  • Park, You-Jin
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.31 no.4
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    • pp.21-28
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    • 2008
  • 본 연구는 반도체 제조공정에서 사용되는 단일 Burn-In oven에서의 Total weighted earliness와 Tardiness를 최소화하기 위한 생산 스케줄링을 결정하는 문제를 다룬다. 본 연구에서는 모든 작업은 상시에 시작가능하고 각각은 서로 다른 가중치를 가지고 있다고 가정하였다. 일반적으로 단일 Burn-In oven은 다양한 작업들이 동시에 가능한 Batch processing 기계이다. 따라서 다양한 작업들로 구성된 하나의 Batch의 Processing time은 그 Batch 내에 있는 가장 긴 Processing time을 가지는 작업에 의해 결정된다. 본 연구에서 Batch size는 미리 결정되지 않은 상황이라고 가정한 후, 최적의 Batch 개수와 작업의 순서를 결정하기 위해 유전자 알고리즘을 적용하였다. 수리적 예제를 통해서 다양한 접근방법의 성능들을 비교한 결과, 유전자 알고리즘이 Total weighted earliness와 Tardiness를 최소화하는데 가장 뛰어난 성능을 가지고 있음을 알 수 있다.

A Case of the Laryngopharyngeal Burn Caused by A Microwave-Heated Egg Bite

  • Won, Seong Jun;Woo, Seung Hoon
    • Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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    • v.24 no.2
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    • pp.122-124
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    • 2013
  • Nowadays, microwave ovens are commonly used for cooking. However, the cooking certain food in microwave ovens can be hazardous. It has been reported that the heating eggs in a microwave oven can cause an explosion and injuries. The exploding eggs can cause burn injury of face, neck, eyelid, pharynx and larynx. Direct thermal damage to the larynx after swallowing microwave-heated eggs is rare. The authors report a larynx thermal injury due to microwave-heated eggs and review the cause and the prevention methods of exploding eggs.

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Reaction of an Insensitive Munitions(IM) Igniter for Solid Propulsion System (고체 추진기관 둔감화 점화 장치의 반응)

  • Ryu, Byung-Tae;Lee, Do-Hyung;Ryoo, Baek-Neung;Choi, Hong-Seok
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2011.11a
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    • pp.352-358
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    • 2011
  • This paper describes on the study of mitigation technique in which a pyrosensor is automatically sensing the rate of risk of fire or explosion of solid rocket motor exposed to an unexpected fire and makes the rocket motor burn itself safely. SCO test was carried out with a rocket motor loaded with HTPB propellant, in which a thermal pyrosensor igniter was installed. The rocket motor in SCO test was located in an oven at $50^{\circ}C$ for 7 hours. The temperature was regulated to be elevated at the rate of $3.3^{\circ}C$ per hour. Results showed Type V(Burning) reaction in this SCO test.

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