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치료용 방사선의 입사각에 따른 광섬유 방사선량계의 체렌코프 빛 측정 및 분석
장경원,조동현,유욱재,신상훈,서정기,이봉수,박병기,문주현 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, we have measured scintillating light generated in a fiber-optic dosimeter by high energy photon and electron beams using a charge-coupled device. The intensity of Cerenkov lights are also measured and characterized as functions of incident angles and energies of the high energy beams from a clinical linear accelerator. To minimize or remove Cerenkov light, a simple subtraction method using a background optical fiber and wavelength discrimination method using optical filters are investigated. Also, the intensities of Cerenkov light induced by high energy photon and electron beams are compared.
윤재철,김원,조규종,홍정석,이미우,장성은,오세현,임경수 대한응급의학회 2001 대한응급의학회지 Vol.12 No.4
Primary aldosteronism is a syndrome characterized by hypertension, hypokalemia, suppressed plasma renin activity, and elevated serum aldosterone levels. Conn first described it 1955 in association with adrenal cortical adenoma(Conn's syndrome). Today, it can be divided into at least six distinctive sub-groups. The diagnosis of primary aldosteronism is usually suspected when the patient presents with poorly controlled hypertension with hypokalemia. The main issues in the evaluation of primary aldosteronism are to differentiate an adenoma from hyperplasia and to localize the adenoma. Basic hormonal studies and computed tomographic(CT) scanning can be used effectively for that differentiation. An adenoma is one of a few potentially curable forms of hypertension, and it is best treated by removing the adrenal tumor. We experienced a case of a typical adrenal adenoma. The patient was a 37-year-old male who had experienced in both his legs over a period of several days a weakness due to hypokalemia. He was diagnosed using basic hormonal studies and adrenal CT scanning. After, he received laparoscopic adrenalectomy and was discharged with improved condition.
등척성 운동 시 요추의 각도에 따른 중앙주파수와 토크의 특성
박경희,권오윤,장근,강성재,김영호 한국전문물리치료학회 2001 한국전문물리치료학회지 Vol.8 No.2
Fatigue is the decline in force produced as a result of prolonged muscle activity. Localized muscle fatigue can be identified by a shift toward low in the frequency components of the EMG signal, typically represented by a fall in the median frequency. Previous studies show that a shortened muscle developes a higher fatigue than elongated muscles. The purpose of this study was to investigate the time-related change of median frequency and torque during maximal isometric back extension exercises at different exercise angles (0˚, 12˚, 36˚, 72˚). Twenty healthy subjects (mean age = 24.35 ± 2.70) were evaluated in this study. Median frequency was extracted from the EMG signals by fast Fourier transform (FFT). Initial median frequency and the slope of median frequency change over time were computed from linear regression analysis. Pearson's product moment correlation was used to quantify the relationship between scope of median frequency and torque. The results were as follows: 1) Significant differences in y-intercepts of torque regression equation with respect to exercise angle were shown. However, there were no differences in the slopes of the median frequency and torque, and y intercept of the median frequency among exercise angles. 2) There was no significant correlation between slope of median frequency and torque. 3) But there was moderate correlation between median frequency and torque at each exercise angle. In conclusion, the exercise angle during maximal isometric back extension exercise is not a direct effect on slope of median frequency and torque. But results showed that median frequency and torque shift were highly correlated in all subjects.
두개강내로 전이된 Adenoid Cystic Carcinoma 2례 : 증례보고 Report of Two Cases
송재욱,윤상민,이창훈,장지수,이승훈,조경자,강신광 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.10
The authors describe two cases of unusual intracranial metastatic adenoid cystic carcinomas. A 42-year-old woman had a right pariental epidural metastatic mass. presumed hematogenous. spread from a primary tumor in the parotid gland. In second case, a 32-year-old man had a intracranial metastatic adenoid cystic carcinoma mimicking calcified psammomatous meningioma on CT scans. We present these unusual cases with a review of relevant literature and a discussion of possible pathogenesis.
학습조직 구축요인과 조직특성의 교육훈련 효과성 연구 : 콜센터 종사자를 중심으로
김경재,정범구,조장현 충남대학교 경영경제연구소 2008 경영경제연구 Vol.31 No.2
With the development of telecommunication technology, and with combination of computer and communication, a new field, which is called a customer care call center , has been created. In the past, the customer center was just passive in the way that their role was just answering to the customers' questions. However, now this has been changed to be active and positive for fulfill customers' satisfaction. Therefore, not only enterprises, but also public institutions and government agencies are having customer care centers as one of methods to maximize customer service. Also, the role of customer care center is extended to marketing activities. The actual proof study on training of call center employees and the transfer of the training to the work has been practiced for this research. The findings of this research are summarized as follows ; first, building factors of learning organization is positively associated with the transfer of training, second, organizational characteristics has moderating effects between building factors of learning organization and training effectiveness. 본 연구는 콜센터 종사자를 대상으로 학습조직 구축요인과 조직특성의 교육훈련 효과성 관계를 알아보기 위하여 학습조직구축요인, 조직특성, 교육훈련 효과성의 개념과 이론을 정리하였고, 연구모형과 가설을 통해 실증분석결과를 제시하였다. 연구결과 학습조직 구축요인이 교육훈련 효과성에 영향을 미치는 것으로 분석되었고, 양 관계에 있어서 조직특성이 부분적으로 조절효과가 있는 것으로 나타났다.
침습성 아스페르길수스증 진단을 위항 갈락토만난 항원검사의 유용성 평가
송경호,이신원,장희창,전재현,박완범,박경운,박상원,오명돈,최강원 대한감염학회 2009 감염과 화학요법 Vol.41 No.2
Background : Invasive aspergillosis (IA) is an important cause of morbidity and mortality among immunocompromised patients. However, 1A is difficult to diagnose, especially in the aforementioned patient group. Recently, galactomannan assay (GMA) using enzyme immunoassay has been introduced in Korea. We evaluated its diagnostic usefulness in the diagnosis of 1A and we analyzed the results according to the underlying diseases. Materials and Methods : All patients who underwent GMA during the period from October 2007 to June 2008 were evaluated retrospectively. According to the criteria of European Organization for Research and Treatment of Cancer/Mycoses Study Group, IA was classified into four clinical categories: proven', probable', possible', and 'non' IA. Patients with 'proven' and 'probable' IA were used as the reference standards for IA. GMA was performed using Platelia Aspergillus EIA (Bio-Rad, Hercules, CA, USA). Optical density index ≥0.5 was considered positive. Results : Of the 144 patients who underwent GMA, two patients were classificed as proven' IA and sixteen patients were probable' 1A. Overall sensitivity, specificity, positive predictive value, and negative predictive value of the assay were 50% (95% confidence interval [C195), 26-74%), 88% (C195, 81-93%), 38% (CI95, 19-59%), and 93% (CI95, 86-97%), respectively. Among the 99 patients with underlying hematologic diseases, GMA showed 67% (C195, 35-90%) sensitivity and 89% (C195, 80-94%) specificity, whereas in 45 patients with underlying diseases other than hematologic diseases, sensitivity and specificity of the assay were 17% (CI95, 0-64%) and 87% (CI95, 73-96%), respectively. Conclusions : GMA showed high specificity, irrespective of the patient population. However, sensitivity of GMA was low and the assay was less sensitive in patients with underlying diseases other than hematologic diseases than in patients with hematologic diseases.
광섬유 방사선 센서와 EBT 필름을 이용한 심부선량 백분율 측정 및 비교
조동현,장경원,유욱재,신상훈,이봉수,문주현,박병기 제주대학교 방사선응용과학연구소 2008 방사선응용과학연구소논문집 Vol.22 No.-
In this study, fiber-optic sensor is fabricated to measure PDD of CLINAC. As a scintillating light generated by a high energy X-ray from the medical LINAC is measured using photo diode amp system, It is expected that a high-resolution, real-time fiber-optic dosimeter for medical LINAC can be developed.