• Clinical Pain
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• 제20권1호
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• pp.15-19
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• 2021

There are many wrist and hand diseases in which ultrasound can help in the diagnosis and treatment. Because many small structures are located, identifying anatomical locations and pathways is especially important. In De Quervain's syndrome, it is necessary to find tendon lesions located in the first compartment of the wrist. If injection therapy is required, administer the regimen accurately within the tendon sheath through ultrasound. In carpal tunnel syndrome, there are several methods to diagnose a disease by measuring cross-sectional area of the median nerve. Ultrasound has the advantage of administering injection therapy without damaging the nerve. Intersection syndrome can be diagnosed by observing swelling and hypoechoic appearances at the point where the tendons of the first compartment cross over the second compartment of the wrist. Ultrasound-guided injection is also safe and efficient. If there is a trigger finger lesion, the most representative findings is to observe a nodular hypoechoic thickening of the involved A1 pulley. When injection therapy is performed, it is effective to administer medication between pulley and flexor tendons as much as possible to reduce pressure on the attached structures.

• 터널과지하공간
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• 제31권6호
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• pp.469-479
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• 2021

콘크리트의 폭렬방지 재료로서 PP섬유는 그 효과가 이미 확인되었다. 그러나 화재 시 발생하는 최대온도에 대한 고려가 필요하고 배합량에 따라 발생하는 믹싱문제 및 강도저하 문제의 해결이 필요하다. 본 연구에서는 RABT화재시나리오 하에서 PP섬유 함유량과 공기량에 따른 터널 세그먼트 라이닝의 화재저항성능을 살펴보았다. 그 결과, 모든 시험체에서 폭렬과 단면손실은 발생하지 않았으며, PP섬유 함유량이 작을 경우 상대적으로 최대온도가 높고 최대온도 도달시간 역시 빠른 것으로 나타났다. 반면, 공기량 차이에 따른 최대온도와 도달시간에 대한 어떤 경향을 발견하지 못했다. PP섬유 혼입량 0.75, 1.0, 1.5, 2.0 kg/m³인 경우에 대한 시험체 내부 온도분포 결과에서는 0.75와 1.0 kg/m³의 결과가 유사한 온도분포를 보였으며, 1.5와 2.0 kg/m³의 결과가 유사하게 나타났다. PP섬유 혼입량이 많을 경우 동일 깊이에서 내부 온도분포가 낮아지는 경향이 있는 것을 확인할 수 있었으며, PP섬유 혼입량 1.0 kg/m³와 1.5kg/m³의 결과에서 주목할 만한 차이가 발생함을 확인하였다.

• 터널과지하공간
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• 제25권6호
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• pp.543-555
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• 2015

최근 대단면 갱도로 개발하고 있는 국내 석회석광산은 작업공간 환기를 위하여 과거 석탄광산에 광범위하게 사용되던 형태의 국부 선풍기를 주로 이용하고 있다. 대단면 갱도에서의 낮은 정압손실을 고려할 때 고풍압 선풍기는 과다 설비용량으로 인하여 비용측면에서 심각한 한계를 보이고 있다. 대단면 갱도에서의 최적 선풍기는 안전한 작업환경 유지를 위한 충분한 환기량을 공급할 수 있어야 할 뿐만 아니라 저운전비용도 보장하여야 한다. 본 연구는 대단면 갱도 내에서 높은 환기효율과 경제성을 가지는 저풍압 국부선풍기를 개발함이 목적이다. 이론적 연구와 아울러 2개소의 단면적이 다른 현장 실험 연구를 통하여 저풍압 선풍기의 환기효율을 분석하였다. 본 연구결과는 작업공간 공기질 및 작업환경 개선을 위한 국부선풍기의 경제성과 효율 제고에 적용 가능할 것으로 기대된다.

• KEPCO Journal on Electric Power and Energy
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• 제5권4호
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• pp.257-262
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• 2019

Lattice steel towers for overhead transmission lines have been replaced by tubular steel poles due to the visual impact of large and complex shape of truss type. Demand for tubular steel poles consisting of a single frame member continues to grow because of its advantages such as visual minimization, architectural appeal and minimal site consumptions. However, there are some constraints on the transportation and construction. As the diameter of tower base has been enlarged, it may exceed minimum height limit required to pass the tunnel in case of land transportation. Also, in a narrow place where it is not easy to secure the installation areas such as mountainous places, there might be some areas wherein it must secure a wide working space so that large vehicles and working cranes will be allowed to enter. In this paper, we presented a vertical separated tubular steel pole, which is a new type of support that can be implemented for general purpose such as mountainous areas or narrow areas to improve the issues raised by breaking away from the conventional design and fabrication methods. Technical approaches for overcoming the limit of the cross-sectional size is to separate and modularize the cross-section of the tubular steel pole designed with a size that cannot be carried or assembled, and to lighten it with a weight capable of being transported and assembled in a narrow space or mountainous area. As a result of this research, it will be possible to enter small and medium sized vehicles in locations where it is restricted to transport by large-sized vehicles. In the case of mountainous areas, it will be possible to divide it into a weight capable of being carried by a helicopter and it will be easy to adjust and fabricate it with individual modules. Furthermore, in order to break away from the traditional construction method, we proposed the equipment that can be applied to the assembly of Tubular Steel Pole without using a large crane in locations where there is no accessible road or in locations wherein large cranes cannot enter. In particular, this paper shows the movable assembling equipment and some methods that are specialized for vertical separated tubular steel pole consisting of members with reduced weight. The proposed assembly equipment is a device for assembling the body of the Tubular Steel Poles. It will be installed inside the support and the modules can be lifted by using the support itself.