• Journal of Chest Surgery
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• v.14 no.4
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• pp.331-338
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• 1981

The inhalation of a foreign body into the tracheobronchial tree is a child is a life-threatening accident. Forgotten foreign bodies In the airways cause chronic pulmonary infections, allergic asthma, bronchiectatic changes, and lung abscess Foreign bodies that cannot be grasped by bronchoscopic forceps should be removed by thoracotomy and bronchotomy. This report describes our experience In 16 patients who were treated to remove inhaled foreign bodies from the airways after repeated bronchoscopies had been unsuccessful from 1963 to 1981 at the department thoracic surgery of Seoul National University Hospital. The surgical procedures are as follows: 12 patients bronchotomy, 2 patient pneumonectomy, 2 patients lobectomy. In these cases, the foreign bodies are 8 metallic material, 3 plastic material, 1 bean, 1 black snail, and 3 cases of no records. Bronchotomy must be performed as soon as possible in order to avoid more advanced pathologic changes In the Involved lung, such as bronchiectasis, fibrosis or abscess.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.03a
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• pp.403-406
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• 2008

The performance of an entire pump system composed of an inducer, an impeller, a volute and seals has been computationally analyzed. A commercial three dimensional Reynolds Averaged Navier-Stokes method is used in this study. The axial thrust is predicted from the pump calculation in its entirety, which is necessary for such estimation. Moreover, the effects of each component on the pump performance are investigated at a design condition through the analysis of flow structures. The predicted performance is in good agreement with experimental data in terms of head rise, efficiency and volute wall pressure distributions despite of highly complex flow structures being present. The computational results also show that the axial and radial thrusts are within the design limit although corresponding experimental measurements were not taken.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2008.11a
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• pp.431-432
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• 2008

In order to develop and inspect the electronic controller of propulsion system, It must emulate the electronic signal similar to actual signal. The applied signals on propulsion system are engine speed, turbine speed, various kinds of temperatue signal, pressure signal, LVDT/RVDT position signal and so forth. Contents are the development of emulator that simulate the electronic signals similar to actual signals.

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2004.04a
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• pp.36-36
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• 2004

• Proceedings of the Korea Concrete Institute Conference
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• 2009.05a
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• pp.359-360
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• 2009

This Study is performed Mock-up test accounting for height of placement to review behavior of mass concrete according to kinds of cement & form. First, we measured hydration heat and show a different hydration heat generation characteristics as compared with each other. And we measured mortar outflow, the strength of concrete core and standard specimens, concrete's ability to resist chloride ion penetration in order to durability estimation of concrete. This study was aims to improve quality of mass concrete under marine environment.

• Journal of Environmental Impact Assessment
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• v.7 no.2
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• pp.135-143
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• 1998

In order to study the general characteristics of reservoir and stream sediments, various analysis tests were conducted. Water contents and ignition loss were measured to know the primary sediment characteristics. The COD, total phosphorus and nitrogen were contained for the determination of organic substance content. For the purpose of establishing the contamination degree of heavy metals, some heavy metal contents were investigated. In heavy metal contents, reservoir sediments showed somewhat higer value than stream sediments. As a result, the reservoir sediment content of all analysis items were higher than stream sediment.

• The KSFM Journal of Fluid Machinery
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• v.11 no.5
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• pp.7-14
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• 2008

Open channel type regenerative pump has been used in various industrial fields. It generates high pressure with low flow rate. However, it has low efficiency because of its complex flow pattern, We studied performance experiments and 3D numerical flow analysis of a regenerative pump. Through the numerical analysis, we could get the internal flow pattern and profile of a regenerative pump. Also, we examined leakage flow effects due to the gap between casing and impeller and stripper clearance. For the numerical analysis verification, we performed experiments and they had similar tendency at the design point.

• Korean Journal of Veterinary Service
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• v.38 no.3
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• pp.163-166
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• 2015

The purpose of this study was to survey seroprevalence of porcine reproductive and respiratory syndrome (PRRS) virus and porcine circovirus-2 (PCV-2) in Gyeongbuk province by enzyme-linked immunosorbent assay (ELISA). A total of 966 samples collected from 21 pig farms were tested. The sero-positive rate of PRRS and PCV-2 were 77.6% (750/966) and 76.4% (738/966), respectively.

• Proceedings of the Acoustical Society of Korea Conference
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• spring
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• pp.211-214
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• 2000

본 논문은 전자파 장해 및 복사내성 측정의 대용 시험시설로 활용될 수 있는 전자파 잔향실의 전자기장 특성에 관하여 연구하였다. 전자파 잔향실 내부 균일성을 확보하기 위하여, 음향효과의 극대화를 위해 인간의 가청 주파수대인 16-20,000Hz 범위, 음속(340 m/sec)에 적용하여 활용되고 있는 Shroeder Quadratic Residue Diffuser를 무선 주파수 대역 30 KHz -3 THz인 범위로 확장, 3가지 형태의 Diffuser를 설계하여 잔향실 내부에 적용하였다. FDTD(Finite-Difference Time-Domain) 수치해석 방식을 이용하여 잔향실 내부의 필드 특성을 조사한 결과 Diffuser를 부착한 3 가지 형태 모두 치대 tolerance $\pm$3dB 이내의 필드 균일도를 나타내었으며, Type 3, 대칭형 구조의 Diffuser 형태가 효율이 가장 우수하다는 결과를 나타내었다.

• Proceedings of the Korean Society of Sericultural Science Conference
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• 2003.10a
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• pp.141-142
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• 2003

Partial cDNA sequencing to generate expressed sequence tags (ESTs) is being used at present for the fast and efficient obtainment of a detailed profile of genes expressed in various tissues, cell types, or developmental stages. We describe here the construction, DNA sequencing and sequence profiles of cDNA library from Uroctea lesserti. (omitted)