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- 저자 : 구자환 ( Ja-whan Koo ) (검색결과 3 건)
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차별적인 드랍-확률을 갖는 동적-VQSDDP를 이용한 상대적 손실차별화의 달성
조경래 ( Kyung-rae Cho ),구자환 ( Ja-whan Koo ),정진욱 ( Jin-wook Chung ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.2
In order to various service types of real time and non-real time traffic with varying requirements are transmitted over the IEEE 802.16 standard is expected to provide quality of service(QoS) researchers have explored to provide a queue management scheme with differentiated loss guarantees for the future Internet. The sides of a packet drop rate, an each class to differential drop probability on achieving a low delay and high traffic intensity. Improved a queue management scheme to be enhanced to offer a drop probability is desired necessarily. This paper considers multiple random early detection with differential drop probability which is a slightly modified version of the Multiple-RED(Random Early Detection) model, to get the performance of the best suited, we analyzes its main control parameters (max<sub>th</sub>, min<sub>th</sub>, max<sub>p</sub>) for achieving the proportional loss differentiation (PLD) model, and gives their setting guidance from the analytic approach. we propose Dynamic-multiple queue management scheme based on differential drop probability, called Dynamic-VQSDDP(Variable Queue State Differential Drop Probability)T, is proposed to overcome M-RED's shortcoming as well as supports static max p parameter setting values for relative and each class proportional loss differentiation. M-RED is static according to the situation of the network traffic, Network environment is very dynamic situation. Therefore max p parameter values needs to modify too to the constantly and dynamic. The verification of the guidance is shown with figuring out loss probability using a proposed algorithm under dynamic offered load and is also selection problem of optimal values of parameters for high traffic intensity and show that Dynamic-VQSDDP has the better performance in terms of packet drop rate. We also demonstrated using an ns-2 network simulation.
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방광암의 진단에 이용한 Bladder Tumor Antigen(BTA) Stat Test와 요세포검사와의 비교
구자환,이창규,류현열 고신대학교 의학부 2002 高神大學校 醫學部 論文集 Vol.17 No.1
Purpose We assessed the sensitivity and specificity of the noninvasive BTA stat test for detection of bladder cancer with special reference to the grades and stages of the tumors. Materials and Methods A total of 163 patients provided voided urine samples for the BTA stat test and cytopathological study. Each patient underwent cystoscopy. Transurethral resections were performed when a bladder tumor was seen or cystoscopic biopsies were obtained when a carcinoma in situ was suspected. Sensitivity was determined using voided urine samples from patients with histologically proven bladder cancer (n=125). Specificity was determined from patients with benign urologic disease (n=40), healthy volunteers (KTP donor, n=20), malignant urologic cancer other than bladder (n=18), non-urologic malignancy (n=2), and patients, with a history of bladder cancer but free of disease (n=24). The sensitivity and specificity of BTA stat test were compared to those of standard voided urine cytology, and the sensitivities of BTA stat test and urine cytology were stratified according to histologic grades and stages. Results Overall sensitivity of the BTA stat test and urine cytology were 86.6% and 45.2% specificity were 72.3% and 97.3% respectively. For each histologic grade of transitional cell carcinoma (grade 1, 2, 3, 4), sensitivity was 36.4%, 84.1%, 87.2% and 91.3% for BTA stat test, and 18.2%, 13.6%, 53.2% and 82.6% for urine cytology, respectively. For each stage of transitional cell carcinoma (stage Ta, T1 > T2), sensitivity was 50%, 81.5% and 98.4% for BTA stat test, and 0%, 5.6% and 75.4% for urine cytology, respectively. The false positive of BTA stat test was seen in patients with gross hematuria, urinary tract infection, urologic malignancy other than bladder cancer and benign prostatic hyperplasia. Conclusion BTA stat test is a simple, non-invasive, inexpensive adjunct to cystoscopy with urine cytology. In our study the BTA stat test was clinically reliable in the diagnosis for bladder cancer, and can be used as a screening test for bladder cancer in patients with hematuria or irritative voiding symptoms.
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