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전립선비대증 환자에서 연령에 따른 전립선용적의 예측인자로서의 전립선특이항원
장혁수,박철희,김천일 대한비뇨의학회 2005 Investigative and Clinical Urology Vol.46 No.2
Purpose: To investigate the ability of serum prostate specific antigen(PSA) as an estimator of the prostate volume in patients with symptomatic benign prostatic hyperplasia(BPH) according to their decade of life. Materials and Methods: Between January 1997 and May 2003, 3,192 patients presented at our clinic due to lower urinary tract symptoms. Of these 1,922 were confirmed as BPH and enrolled in this study. Patients with prostate cancer and conditions other than BPH at the baseline were excluded. Receiver operating characteristic(ROC) curves were constructed to evaluate the diagnostic ability of serum PSA to estimate the threshold prostate volume and select the optimal PSA cut-off values. Results: The ROC curve analyses revealed the serum PSA to be a good estimator of the prostate volume, with areas under the ROC curves of 0.785, 0.846 and 0.856 for prostate volume cut-off points of 30, 40 and 50ml, respectively. The optimal serum PSA cut-off values for all age groups, irrespective of age, were 1.5ng/ml for the detection of a prostate volume >30ml and 2.0ng/ml for a prostate volume >40ml. Conclusions: Serum PSA can be used to estimate the prostate volume. Since the treatment outcome or risk of complications depends on the prostate volume, the estimated prostate volume is useful in therapeutic decision making in the absence of a reliable direct measurement of the prostate volume.
유진호,손준영,안재환,박성우,김명수,장혁수 明知大學校 産業技術硏究所 1996 産業技術硏究所論文集 Vol.15 No.-
ATM(Asynchronous Transfer Mode) is a transmission technique for the B-lSDN(Broadband Integrated Service Digital Network). Congestion problems are unavoidable in the ATM networks, since various traffic typos coexist in the networks. The preventive congestion control algorithm is widely used for the real time traffics such as voice and video. The reactive congestion control algorithm works well for the non-real time traffic within a short distance. A mixed traffic control algorithm is proposed, which works either preventively or reactively based on traffic types. The proposed algorithm sets a high and low threshold value at the output buffers and modifies the EPRCA(Enhanced Proportion Rate Control Algorithm) to control loss-sensitive cells. Delay-sensitive cells are handled by the priority control and the UPC(Usage Parameter Control) algorithm. The performance analysis shows that the proposed traffic control algorithm works well for both the VBR(Variab1e Bit Rate) and ABR(Available Bit Rate) traffic with small buffers
하부요로증상을 가진 여성 환자에서 Tamsulosin 0.2mg 단독요법의 유효성
장혁수,정세일,권태균,김덕윤,오태희,정재일,박철희 대한배뇨장애요실금학회 2006 International Neurourology Journal Vol.10 No.2
Purpose: The study of lower urinary tact symptoms (LUTS) in women is rare except urinary incontinence, and there were even no diagnostic or therapeutic guidelines for female bladder outlet obstruction. The objective of this study was to determine the efficacy of tamsulosin 0.2 mg/day single therapy for the female patients with LUTS. Materials and Methods: A total 71 patients were evaluable. Tamsulosin 0.2 mg/day was administered orally in a nonblind design for 8 weeks. The efficacy parameters were International Prostate Symptom Score (IPSS), quality of life (QOL) score, frequency in daytime and night, maximal flow rate (Qmax), post-void residual urine volume (PVR), and changes in blood pressure and pulse rates. Changes in parameters between baseline and 8 weeks were assessed using Student’s paired t-test. Results: Statistically significant changes in the total, obstructive and irritative IPSS, QOL score, daytime and night time frequency, Qmax and PVR were observed at week 8. Adverse events included dizziness in 2 patients and increased nocturia in 1 patient. There were no withdrawals resulting from adverse events. There were significant differences in systolic blood pressure, but did not cause significant hypotension events. Conclusion: Treatment with tamsulosin 0.2 mg/day in female patients with LUTS was effective and well tolerated in improving LUTS and QOL. (J. Korean Continence Society 2006;10:140-146)
민경훈,장혁수 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-
네트워크 토플러지는 네트워크 관리에 매우 중요한 정보를 제공하여 왔는데 현재까지 네트워크 지도에 관한 정보를 얻는 방법은 네트워크를 직접 구성한 관리자에 의한 수 작업 또는 관리자만이 알 수 있는 정보의 입력에 의해서만 작동하는 반자동 시스템이 주류를 이루어왔다. 이러한 시스템은 입력 조건이 관리구역내의 모든 네트워크 주소 또는 모든 IP 주소와 서브넷 정보가 있어야 하기 때문에 네트워크 관리자를 제외하고는 네트워크 전체 구성에 대한 정보를 얻어내기에는 한계가 있고 다수 프로토콜의 사용에 의해 발생시키는 트리픽양도 증가하는 것을 알 수 있었다. 하지만 일반적인 입력 정보에만 의존한 검색 알고리즘은 입력 조건의 제한에 의해 관리 구역과 외부 망과의 경계에 대한 명확한 구분에 있어서 어려움이 있었다. 본 논문에서는 일반사용자 누구나 관리자의 도움 없이 입력 가능한 정보를 이용하고 서브네트워크 주소 범위 추정 방법을 이용하여 관리 구역에 있는 네트워크 구성에 관한 정보를 얻을 수 있는 알고리즘을 제안하며 성능 분석을 통하여 트랙픽양과 실행 시간이 줄어드는 것을 보였다.
김대수,장혁수 明知大學校 産業技術硏究所 2000 産業技術硏究所論文集 Vol.19 No.-
핸드오프가 빈번히 발생하는 마이크로 셀룰러 시스템에서 제한된 주파수 자원을 보다 효율적으로 사용하고자 하는 알고리듬들이 제안되어 왔으나 핸드오프를 위해 사용자의 실제 이동 방향에 관계없이 주위 셀 모두의 핸드오프 용 주파수를 예약하는 방식이 주로 사용되었고 그것은 주파수 자원의 낭비를 초래하여 왔다. 본 논문은 사용자의 이동 방향 및 속도가 고려된 벡터 파라미터를 사용하여 실제 이동 방향과 관계 있는 셀에 대해서만 핸드오프 용 주파수를 예약하는 방식을 제안하고 성능분석을 통하여 주파수 자원을 절약할 수 있음을 보여준다.
장혁수,신병수,서만욱,오선영 대한평형의학회 2017 Research in Vestibular Science Vol.16 No.2
Wernicke’s encephalopathy (WE) is a neurological disorder induced by a dietary vitamin B1 (thiamine) deficiency which is characterized by encephalopathy, gait ataxia, and variant ocular motor dysfunction. In addition to these classical signs of WE, a loss of the horizontal vestibulo-ocular reflex (VOR) is being reported as the major underdiagnosed symptoms in WE. In this retrospective single center study, we report four cases of WE initially presented with impaired horizontal VOR in addition to the classical clinical presentations, and imaging and neurotological laboratory findings were described.