• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 A
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• pp.165-167
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• 1995

In this paper, the principle of the magnetic flux generation which influences the magnitude of the arc rotation in the interrupter of rotary arc type gas circuit breaker(GCB) is explained. The several factors making the phase difference between arc current and generated flux are analyzed and used to design and manufacture the rotary arc type model GCB. The magnetic flux density is calculated for the model GCB and the calculated result compared with that of the measured one.

• Asian Pacific Journal of Cancer Prevention
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• 제14권2호
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• pp.929-934
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• 2013

Aim: To analyze the significance of different clinical factors for prognostic prediction in diffuse large B-cell lymphoma (DLBCL) patients. Methods: Two hundred and twenty-seven DLBCL patients were retrospectively reviewed. Patients were managed with cyclophosphamide, doxorubicin, vincristine, and prednisone (CHOP) regimen or rituximab plus the CHOP (RCHOP) regimen. Results: Lactate dehydrogenase (LDH), ${\beta}2$-microglobulin (${\beta}2$-M), B symptoms, Ann Arbor stage and genetic subtypes were statistically relevant in predicting the prognosis of the overall survival (OS). In the CHOP group, the OS in patients with germinal center B-cell-like (GCB)(76.2%) was significantly higher than that of the non-GCB group (51.9%, P=0.032). With RCHOP management, there was no statistical difference in OS between the GCB (88.4%) and non-GCB groups (81.9%, P=0.288). Conclusion: Elevated LDH and ${\beta}2$-M levels, positive B symptoms, Ann Arbor stage III/IV, and primary nodal lymphoma indicate an unfavorable prognosis of DLBCL patients. Patients with GCB-like DLBCL have a better prognosis than those with non-GCB when treated with the CHOP regimen. The RCHOP treatment with the addition of rituximab can improve the prognosis of patients with DLBCL.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.18-20
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• 2002

In this paper, various forces generated in the Gas Circuit Breaker(GCB) such as operating force, repulsive force, spring force, and dashpot force are analyzed with the fluid properties and the mechanical structure. The operation of GCB can be understood. A stroke curve from the result of simulation is compared with experimental one.

• 전기저널
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• 통권219호
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• pp.23-32
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• 1995

• 전기산업
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• 제4권4호
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• pp.22-31
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• 1993

• ETRI Journal
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• 제5권1호
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• pp.73-78
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• 1983

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
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• 제51권5호
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• pp.242-248
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• 2002

It is important to develop new effective technologies to increase the interruption capacity and to reduce the size of a UB(Gas Circuit Breakers). Major design parameters such as nozzle geometries and interrupting chamber dimensions affect the cooling of the arc and the breaking performance. But it is not easy to test real GCB model in practice as in theory. Therefore, a simulation tool based on a computational fluid dynamics(CFD) algorithm has been developed to facilitate an optimization of the interrupter. Special attention has been paid to the supersonic flow phenomena between contacts and the observation of hat-gas flow for estimating the breaking performance. However, there are many difficult problems in calculating the flow characteristics in a GCB such as shock wave and complex geometries, which may be either static or in relative motion. Although a number of mesh generation techniques are now available, the generation of meshes around complicated, multi-component geometries like a GCB is still a tedious and difficult task for the computational fluid dynamics. This paper presents the CFD program using CFB-CAD integration technique based on Cartesian cut-cell method, which could reduce researcher's efforts to generate the mesh and achieve the accurate representation of the geometry designed by a CAD tools.

• Asian Pacific Journal of Cancer Prevention
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• 제13권7호
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• pp.3037-3046
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• 2012

The diffuse large B-cell lymphoma (DLBCL) encompasses two major groups of tumors with uneven survival outcomes - germinal center B-cell (GCB) and non-germinal center B-cell (non-GCB). In the present study, we investigated the expression of GCB markers (BCL-6 and CD10) and non-GCB markers (CD138 and MUM-1) in an effort to evaluate their prognostic value. Paraffin-embedded tumor biopsies of 46 Jordanian DLBCL patients were analyzed, retrospectively, by immunohistochemistry to investigate the expression of BCL-6, CD10, CD138 and MUM-1. In addition, survival curves were calculated with reference to marker expression, age, sex and nodal involvement. Positive expression of BCL-6, CD10, CD138 and MUM-1 was shown in 78%, 61%, 39% and 91% of the cases, respectively, that of BCL-6 being associated with better overall survival (p = 0.02), whereas positive CD138 was linked with poor overall survival (p = 0.01). The expression of CD10 and MUM-1 had no impact on the overall survival. Among the clinical characteristics studied, diagnosis at an early age, nodal involvement and maleness were associated with a higher overall survival for DLBCL patients. Our results underline the importance of BCL-6 as a marker of better prognosis and CD138 as a marker of poor prognosis for DLBCL patients.

• 한국작물학회지
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• 제34권2호
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• pp.192-197
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• 1989

재식밀도를 달리할 때 얼자제거가 단옥수수의 생육 및 수량에 미치는 영향을 구명하고자 단옥 1호와 Golden Cross Bantam 70(GCB 70)을 10a 당 4167, 5557,6667,8333, 11111 개체 재식하여 얼자의 초장이 15cm 이내일 때 얼자를 제거하는 구와 제거하지 않은 구의 생육 수량 등을 조사한 결과를 요약하면 다음과 같다. 1. 두 교잡종 모두 재식밀도가 증가할수록 개체당 얼자수는 직선적으로 감소되었다. 2. 간장, 수장, 수경, 개체당 및 10a 당 이삭수는 교잡종간에 차이가 없었다. 단옥 1호는 10a 당 8333본 이하 재식구에서 약 20％ 근도복이 되었으나 GCB 70은 재식밀도에 관계없이 도복이 전혀 되지 않았다. 엽년적지수 및 간엽수량은 단옥 1호가 GCB 70보다 컸었다. 3. 근도복과 엽면적지수를 제외하고는 교잡종과 재식밀도간 교호작용이 없었다. 4. 재식밀도가 증가할수록 간장, 엽면적지수 및 간엽수량은 직선적으로 감소하였다. 재식밀도 증가에 따른 엽면적지수의 증가는 GCB 70보다 단옥 1호에서 컸었다. 5. 재식밀도와 10a 당 이삭수 및 이삭수량과는 이차곡선적인 증가 관계가 있었으며 이상수량, 10a 당 이삭수, 이삭크기 등을 고려한 적정재식밀도는 10a 당 6500 본 정도로 판단되었다. 6. 착수고와 엽면적지수를 제거하고는 교잡종과 얼자제거, 재식밀도와 얼자제거간에 유의한 교호작용이 없었으며 교잡종, 재식밀도, 얼자제거간에는 어떠한 형질에도 유의한 교호작용이 없었다. 7. 얼자제거에 의하여 간장, 이삭수량 및 간엽수량이 각각 3, 10, 16％ 감소되었으나 출사기, 근도복, 수장, 수중, 본당 및 10a당 이삭수 등은 크게 영향을 받지 않았다. 8. 따라서 얼자제거를 하거나 제거를 하지 않거나 간에 적정재식밀도는 10a 당 6500 본 정도로 생각되며 교잡종, 재식밀도에 관계없이 얼자를 제거하지 않은 것이 유리할 것으로 판단되었다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 C
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• pp.1344-1346
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• 1995

The interrupting capability of gas circuit breakers(GCB) are critically dependent on the pressure rise of the puffer cylinder or the thermal expansion chamber at current zero. Therefore it's very useful for the designers to know the pressure rise there at the design stage. Much effort has been done to predict the pressure rise in the puffer cylinder or the thermal expansion chamber in no-load condition. Thus, we now calculate it with reasonable accuracy with the simple programs coded by ourselves or with the commercial CFD packages. However, it has been still difficult problem to calculate it under the existence of arc. In this paper, we propose a method which can be used to predict the pressure rise in the thermal expansion chamber of thermal expansion type GCB. The method has been applied to the 25.8kV 25kA thermal expansion type model GCB and the calculated results have been compared with those from experiment.