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정국진,이재협,황창주,안면환 대한척추외과학회 2011 대한척추외과학회지 Vol.18 No.4
Study Design: A review of literature including definition, diagnosis and treatment of neuropathic pain. Objectives: To review and discuss the treatment guideline for neuropathic pain. Summary of Literature Review: Neuropathic pains are characterized by partial or complete somatosensory change caused by various disorders affecting central and peripheral nervous system, and are especially problematic because of their severity, chronicity and resistance to simple analgesics. Materials and Methods: Review of literature. Results: Tricyclic antidepressants and the anticonvulsants gabapentin and pregablin were recommended as first-line treatments for neuropathic pain. Opioid analgesics and tramadol were recommended as second-line treatments that can be considered for first-line use in selected clinical circumstances. Other medications such as dual reuptake inhibitors of both serotonin and norepinephrine would be used in severe cases. More invasive interventions (e.g., spinal cord stimulation) may sometimes be helpful. Conclusions: Treatment must be individualized for each patient and aggressive, combinatory pharmacotherapy and multidisciplinary approach are recommended for the treatment of neuropathic pain.
다발성 근골격계 전이로 오인된 신세뇨관 산증이 동반된 Sj$\"{o}$gren 증후군
정국진,유정한,노규철,이동녕,윤회수,Chung, Kook-Jin,Yoo, Jung-Han,Noh, Kyu-Cheol,Lee, Dong-Nyoung,Yoon, Hoi-Soo 대한근골격종양학회 2007 대한골관절종양학회지 Vol.13 No.1
Sj$\"{o}$gren 증후군은 외분비샘에 임파구 침윤으로 발생한 안구와 구강 건조를 특징적인 증세로 하는 만성적이며 서서히 진행하는 자가면역질환이나 저자들은 건조성 증세 없이 전신적 증세만을 호소하였으며 방사선 검사상 다발성 근골격계 전이로 오인되었으나 신세뇨관 산증을 동반한 일차성 Sj$\"{o}$gren 증후군으로 확진되었던 증례를 경험하였기에 보고하고자 한다. Sj$\"{o}$gren's syndrome is a systemic, autoimmune disorder of the exocrine glands with associated lymphocytic infiltrates of the affected glands and characteristic of dry eye and mouth. We report a case of Sj$\"{o}$gren's syndrome in which the patient presented systemic symptoms without sicca symptoms and had radiologic findings mimicking multiple skeletal metastasis and was finally confirmed with Sj$\"{o}$gren's syndrome with renal tubualr acidosis.
정국진,남성식,Jin-Woo Shin,고영채 한국통신학회 2020 Journal of communications and networks Vol.22 No.6
In this paper, we set up the statistical channel modelof ship-to-ship (or ship-to-shore) free space optical links considering generalized pointing error and weak turbulence. We combinevarious pointing error models with weak turbulence and derivethe composite probability density functions (PDF) for each case ofpointing error model. Also, using the similarity of the compositePDFs, we obtain a unified expression for the composite PDF. Furthermore, we conduct error rate analysis based on both intensitymodulation and direct detection (IM/DD) and heterodyne detection (HD). At last, the numerical results confirm that the derivedaverage error rate gives precise prediction on error rate.
Effect of inner wall configurations on the separation efficiency of hydrocyclone
정국진,황인주,김윤제 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11
The cyclone separator is widely used for separating liquid-gas as well as particle-laden flow through the vortex separation phenomenon. This is a simple principle with wide temperature and pressure range, so it can be used in various industrial fields. So far, many studies have dealt with the case where there is no groove on the inner wall of the hydrocyclone. In this study, the flow characteristics and the particle separation efficiency of the cyclone separator were investigated by changing the inner wall configuration through numerical analysis. The geometry was designed by changing the wall configuration after referring to previous research. The change of wall was ribbing (convex) and slotting (concave) with a helical pattern. The helical parameters were changed, and their results were compared with each other. The working fluid is water, and the solid is an asphalt that was assumed to be spherical. Numerical analysis was performed using ANSYS CFX ver. 18.1. The Reynolds stress turbulence model (RSM) was used, which is suitable for the simulation of swirling turbulent and vorticial flows. The results of this study suggest that the optimal shape of wall surface will improve the fine particle separation technique of the cyclone separator.
심부지열 용 동축 열교환기 성능예측을 위한 열전달 실험 및 해석
정국진,정윤성,박준수,이동현,Jung, Kuk-Jin,Jeong, Yoon-Seong,Park, Jun Su,Lee, Dong Hyun 한국교통대학교 융복합기술연구소 2017 융ㆍ복합기술연구소 논문집 Vol.7 No.1
The Heat exchanger for deep geothermal system is very important to enhance the efficiency of the system. The co-axial heat exchanger is used due to the limitation of digging space. The heat transfer on the external surface of outer pipe should be high to receive a large amount of heat from the ground. However, the inner pipe should be insulated to reduce the heat loss and increase the temperature of discharge water. This study made experiment apparatus to describe the co-axial heat exchanger and measure the heat transfer coefficients on the internal and external surface. And the pin-fin was designed and fixed on the internal surface to increase the efficiency of heat exchanger. Finally, we calculated the temperature of discharge water using the heat transfer circuit of co-axial heat exchanger and heat transfer coefficient which from experimental results. The water temperature was reached the ground temperature at -500 m and following the ground temperature. When the water return to the ground surface, the water temperature was decreased due to heat loss. As the pin-fin case, the heat transfer coefficient on the internal surface was decreased by 30% and it mean that the pin-fin help to insulate the inner pipe. However, the discharge water temperature did not change although pin-fin fixed on the inner pipe.
브루셀라균에 의한 경막외 농양을 동반한 척추추간판염의 수술적 치료 - 증례 보고 -
정국진,박기훈,고성혜,황지효,김홍균,노규철,유정한,송경원 대한척추외과학회 2009 대한척추외과학회지 Vol.16 No.1
Brucellosis is a well known systemic, zoonotic disease that can affect many organs. We report a rare case of spondylodiscitis with an epidural abscess caused by brucellosis. The patient was treated surgically for severe pain and concomitant devastating neurological deficit. A diagnosis of spondylodiscitis or an epidural abscess due to brucellosis must be considered when acute back pain, radiating pain and febrile episodes occur, particularly in people in a high risk group. 브루셀라증은 여러 장기를 침범하는 비교적 알려진 전신성 인수 공통 감염증이다. 저자들은 브루셀라증에 속발한 경막외 농양을 동반한 척추 추간판염을 보고하고자 한다. 환자는 심한 통증에 신경학적 이상 소견이 동반되어 수술 적 치료를 시행하였다. 고위험군의 사람에서 급성 요통 및 방사통과 발열이 있을 경우 반드시 브루셀라증에 의한 척 추 추간판염 및 경막외 농양을 감별해야 할 것으로 생각된다.