• Journal of Chest Surgery
• /
• v.20 no.2
• /
• pp.367-373
• /
• 1987

Dissecting aneurysm has long been recognized as an ominous and highly lethal form of aortic disease. Aortic dissection are characterized by longitudinal separation of aortic media and extension proximally, distally or both from the site of intimal tear. DeBakey and associates defined three types based on where the process originates and how far extends. In type I, intimal tear is located in the ascending aorta and extend beyond the descending aorta. We experienced a case of dissecting aneurysm, Type I of DeBakey`s classification which dissection extend to the left iliac artery. The patient was 61 years old woman and suffered from excruciating pain on admission. Excision of aneurysm and ascending aorta reconstruction using to Dacron Vascular Prosthesis were performed under extracorporeal circulation. The post-operative course was uneventful and follow up is continued.

• Journal of Applied Reliability
• /
• v.5 no.3
• /
• pp.343-355
• /
• 2005

As the propellants decompose, they release nitrogen oxides which reduce the shelf life of the propellants by accelerating decomposition rate. The activated carbon fiber was used to extend the shelf life of the propellants that was stockpiled by the military. It is found that the activated carbon fiber adsorbs the nitrogen oxides which were produced by spontaneous reaction of the propellants. As a result, the activated carbon fiber extend the shelf life of the propellants by reducing decomposition rate of the propellants. If 20g of propellant store with 2g of activated carbon fiber, the shelf life of the propellants can be lengthened by 1.4 times.

• Proceedings of the Korean Institute of Building Construction Conference
• /
• 2014.05a
• /
• pp.84-85
• /
• 2014

Green frame is column-beam structure composed of precast concrete members. Based on Revision of Structural Concrete Design Code, the bottom rebar of beam shall be extend at least 150mm into the support member. However, if the bottom rebar extend to satisfy Revision of Structural Concrete Design Code, the installation fo beam is impossible due to interference between the columns and beams. Thus, the aim of this study is estimation of production length of precast concrete beam by using splice length of bottom rebar. In this study to solve this problem, lap splice were used on the join. This study was calculated length of the reinforcement by the diameter. According to the length of the rebar, the production length of beam concrete was calculated. The results of this study will satisfy the Revision of Structural Concrete Design Code about column-beam connection when green frame will be applied.

• Korean Journal of Computational Design and Engineering
• /
• v.10 no.1
• /
• pp.49-60
• /
• 2005

Existing CAD systems have configured geometry data and it is necessary to extend the configured geometry into a knowledge-based system. An intelligent CAD system emerged to provide such a knowledge-based system. However the intelligent CAD system has a limited product model to represent various knowledge models. This paper presents a model, called extended intelligent CAD model, which can extend the product model of the intelligent CAD system into further detailed knowledge model. The extended intelligent CAD model includes a whole design process knowledge and an efficiency of the model has been verified via a knowledge based wiper design system. The model can improve the functionality and efficiency of the existing CAD systems.

• Journal of applied mathematics & informatics
• /
• v.7 no.1
• /
• pp.139-159
• /
• 2000

In this manuscript we study perturbed Newton-like methods for the solution of nonlinear operator equations in a Banach space and their discretized versions in connection with the mesh independence principle. This principle asserts that the behavior of the discretized process is asymptotically the same as that for the original iteration and consequently, the number of steps required by the two processes to converge to within a given tolerance is essentially the same. So far this result has been proved by others using Newton's method for certain classes of boundary value problems and even more generally by considering a Lipschitz uniform discretization. In some of our earlierpapers we extend these results to include Newton-like methods under more general conditions. However, all previous results assume that the iterates can be computed exactly. This is mot true in general. That in why we use perturbed Newton-like methods and even more general conditions. Our results, on the one hand, extend, and on the other hand, make more practical and applicable all previous results.

• Proceedings of the Korea Contents Association Conference
• /
• 2005.11a
• /
• pp.659-663
• /
• 2005

It was expressed repeated information on reuse design pattern in the design information because it was impossible to build a standardized design pattern in the existing design pattern tools. Also, It must possible to extend standardized design pattern just as one intended of designer. And It is able to express objects just as one intended of designer. Therefore, the representative characteristic of this paper was able to define XMI metamodel to express design pattern, and was able to extend metamodel to express design pattern.

• Bulletin of the Korean Mathematical Society
• /
• v.31 no.2
• /
• pp.297-308
• /
• 1994

In [5], M. Cwikel and J. Peetre showed that some Banach couples are Calderon pairs and every K-monotone cones in that couples can be constructed by the Peetre K-method. With the help of theorem 4 in [3], we can extend the above result to the K-monotone spaces. In [4], M. Cwikel provided the proof of therem 4 in [3] and also mentioned that some theorems in [5] which were stated in terms of K-monotone cones can be extended to K-monotone spaces. But M. Cwikel and J.Peetre's results only cover the case when over bar A = over bar B. We extend this result to the case when over bar A.neq. over bar B. In this case, we need a condition stronger than that the K-monotone space.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2017.07a
• /
• pp.275-278
• /
• 2017

기존의 임베디드 기기의 하드웨어는 리눅스의 장점에도 불구하고 임베디드 기기들의 프로세서나 메모리 등의 하드웨어 자원이 Built-in 형태로 제공되어 시스템 운용 환경 변화에 맞춘 대응이 어렵다. 이러한 문제를 해결하기 위해 본 논문에서는 i.MX6Q SABRE Board for Smart Devices를 참조하여 메모리를 교체할 수 있도록 SO-DIMM을 장착하고 PCIe 이더넷을 추가한 개발보드를 만들었다. 그리고 개발보드에 추가 및 변경 된 하드웨어 디바이스를 활성화한 새로운 임베디드 시스템을 이식하는 방법을 제시한다. 구현 및 성능 분석 결과 새로운 임베디드 시스템에서 운용자는 시스템 운용 시 환경 변화에 대응하여 메모리를 바꾸어 장착할 수 있게 되었고 이로 인해 시스템의 요구사항에 따라 자원의 확정성 및 유연성이 높아짐을 확인하였다.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2017.07a
• /
• pp.390-391
• /
• 2017

본 논문에서는 배터리의 수명을 연장할 수 있는 효율적인 충전방법에 대해 제안하였다. 제안된 방법은 우선 충전하고자 하는 배터리의 전압과 전류를 측정한다. 측정된 배터리의 전압과 같은 값에서 1.5배 값까지 단계적으로 전압을 상승시켜 배터리의 상태를 검사한다. 배터리의 반응 상태들 중에서 충전이 가장 안정적인 전압을 결정한다. 전압이 결정되면 배터리의 전류 값을 배터리 용량의 1/3에서 1/10까지 단계적으로 조율하여 충전을 하도록 한다. 이러한 방법은 배터리를 보호하면서 충전 시간을 축소시켜 효율적으로 배터리를 관리할 수 있는 방법이다. 제안된 방법의 효율성을 입증하기 위해 핸드폰 보조배터리로 가장 많이 사용되고 있는 리튬 폴리머 배터리를 이용하여 실험하였다. 실험 결과 충전시간의 감소와 안전성 등의 효율성이 입증되었다.

• Journal of Industrial Technology
• /
• v.23 no.A
• /
• pp.29-33
• /
• 2003

This paper proposed methods of filament preheating to extend a fluorescent lamp life. The ballast for the fluorescent lamp can be classified into two main groups magnetics and electronics. The electronic ballast is lighter and smaller than the magnetic ballast and it can dim up and down. There are two ways to start the fluorescent lamp in the electronic ballast: rapid start and instant start. Also there are two methods of the driving inverter self excited oscillation and force excited oscillation. The rapid starting is different from the instant starting in that the rapid start is preheating the filament before the steady state. If there is a preheating process before the lamp ignition, the life of the fluorescent lamp can be increased. This paper presented the preheating methods for self excited oscillating system and force excited oscillating system.