• 대한미세수술학회:학술대회논문집
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• 1992.11a
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• pp.67-67
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• 1992

• The KSFM Journal of Fluid Machinery
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• v.16 no.2
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• pp.48-53
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• 2013

This paper presents a numerical investigation of the influence of the blade back sweep angle on the performance and flow characteristics in a centrifugal compressor with a vaneless diffuser. Five impellers with different back sweep angles were tested in the flow simulations. It was found that a low back sweep angle could improve the total-to-total pressure ratio and the work coefficient over whole operating ranges. However, the flow field in an impeller with a low back sweep angle produced a more non-uniform velocity distribution at the impeller exit because the wake region was significantly increased. As a consequence, the impeller with a low back sweep angle caused a low diffuser performance.

• Proceedings of the KOSOMBE Conference
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• v.1992 no.11
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• pp.47-50
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• 1992

This paper describes pattern classification algorithm of ECG using back-propagation neural network. We presents new feature extractor using second order approximating function as the input signals of neural network. We use 9 significant parameters which were extracted by feature extractor. 5 most characterized ECG signal pattern is classified accurately by neural network. We use AHA database to evaluate the performance ol the proposed pattern classification algorithm.

• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.677-679
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• 2005

최근 나노입자를 이용하는 광전 화학전지(PEC, Photoelectrochemical)인 염료감응형 태양전지(DSC)의 효율이 증가함에 따라 DSC 태양광 발전 시스템의 성능 개선 또한 요구되어진다. 본 연구에서는 Fly-Back DC-DC 컨버터(변화비율1:10)를 이용하여 DSC셀의 전압을 DC 300V로 승압시켰다. 또한 풀브릿지 인버터를 사용하여 AC 220V, 60Hz의 출력전압을 얻었다. 연구에서 제안한 회로는 높은 효율의 동작특성과 간단한 제작, 낮은 제조비용, 그리고 안정성을 추구한다. 또 다른 주요점은 부하단에서 Feed back을 받아 동작을 컨트롤하는 것이다. 부하단의 출력 전압과 전류를 Feed back 받아서 DSP320LF2406을 A/D기능을 사용하여 실시간으로 부하의 변화에 대처하여 컨버터와 인버터의 동작을 제어한다.

• Journal of Acupuncture Research
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• v.26 no.1
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• pp.187-196
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• 2009

Objectives : The purpose of this study was to evaluate the oriental conservative treatment for FBSS patient who were diagnosed as the Cauda equina syndrome. Methods : The patient were treated by the oriental medical conservative treatment including herbal medication, dry needle acupuncture, direct moxibustion and indirect moxibustion, cupping therapy and, physical therapy. We estimated by Visual Analog Scale and Oswestry disability index for evaluate the effect of Oriental conservative treatment. Results : After treatment, patient's visual analogue scale score and Oswestry disability index score were generally decreased. Conclusions : The oriental medical conservative treatment might be an effective method to treat the FBSS patient who were diagnosed as the Cauda equina syndrome.

• Research in Plant Disease
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• v.29 no.2
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• pp.204-204
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• 2023

• Journal of the Korean Burn Society
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• v.22 no.2
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• pp.58-65
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• 2019

Wound caused by high-tension electrical burns is difficult to manage because the wound is deep and complex. The wound is progressively necrotic due to microvascular injury resulting in deep tissue exposure. So, coverage of the wound at the entry point and the exit point is cumbersome, often requiring flap coverage. We experienced a case of one patient for peroneal artery perforator free flap coverage on the palm of the right hand of the entry point of electrical burn. The left foot wound of electrical exit point was covered by full thickness skin graft. Also a small wound was on the left side of the lower back was the exit point of electrical burn. The lower back wound was healed and recurred repeatedly after burn. On postburn day 6 month, through the radiologic exam, metal shadow was identified in the left gluteus muscle forming chronic sinus. We explored the wound of sinus and a foreign body was identified in the sac as multi braid wires thin as hair. According to the patient's past history, we suspected that the back wound was caused by electrical burn injury through the wires.

• Journal of Acupuncture Research
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• v.20 no.6
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• pp.140-147
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• 2003

Objective: This study was designed to investigate the difference of treatment effect between Oriental Medicine theraphy and Oriental and Western Medicine combination theraphy on low back pain patients. Methods: We divided 40 low back pain patients into 2 groups. The Group I was treated with Oriental Medicine theraphy and the Group II was treated with Oriental and Western Medicine combination theraphy. We evaluated visual analogue scale(VAS) score before and after 3, 5, 7 days of each treatment. Results: The VAS score of Group I and Group II after 3, 5, 7 days of each treatment was significantly lower than before treatment. But there was no significant difference between two groups after 3, 5, 7 days of each treatment. Conclusions: In this study, there was no significant difference between the two groups after 3, 5, 7 days of each treatment on low back pain patients. Further studies are needed for the comparison of Oriental Medicine theraphy and Oriental and Western Medicine combination theraphy.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.5 no.1 s.9
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• pp.65-70
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• 2006

A UHF band RFID passive tag antenna, which can be attached on metallic objects, is proposed. The proposed tag antenna is more insensitive to the size of the metallic object than conventional PIFAs or IFAs. It is constructed on a multi-layer and its size is reduced by using a 'L' slit. Performances of the antenna is analyzed by Ansoft's HFSS and measured using a back-scattering method. The simulated and measured data are obtained with varying the size of metallic object.

• Journal of Oriental Neuropsychiatry
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• v.22 no.4
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• pp.41-50
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• 2011

Objectives : The purpose of this study is to know that Beck Depression Inventory(BDI) score to effect on improvement degree of low back pain after oriental medical treatment. Methods : We analyzed charts of 33 inpatients who were treated in Ja-Seng Hospital of Oriental Medicine and Bu-Cheon Ja-seng Hospital of Oriental Medicine. Subject is divided into Group A(BDI<10) and Group B(BDI${\geqq}$10). Numerical Rating Scale(NRS) and Oswestry Disability Index(ODI) were checked on admission, after 1 week, NRS and ODI were rechecked to estimate the efficacy of treatments. Results : 1. In both groups, NRS was significantly decreased(p<0.05). Analyzed result of the interaction between the two groups didn't show significant difference(p=0.197). 2. In Group A, ODI was significantly decresed(p<0.05). In Group B, ODI wasn't significantly decreased(p=0.058). The interaction analysis between the two groups didn't show significant difference(p=0.173). 3. Analyzing patients with chronic back pain longer than 6 months by the presence of depression tendency and NRS, ODI decrease after 1 week of ambulation, while the NRS reduction showed relevancy by the depression tendency (p<0.05), the ODI reduction didn't(p=0.272). Conclusions : 1. Although improvement of pain before and after the treatment and degree of functional recovery in high-level BDI group was less than low-level BDI group, but it was stastically insignificant. 2. High BDI score of patients with chronic low back pain is the factor of disturbing pain improvement.