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Demonstration Test for Introduction of Primary Treatment Enhancement Technology
( Katsumi Oshiro ) 대한상하수도학회 2007 공동추계 학술발표회 논문집 Vol.2007 No.-
The results of the demonstration test showed stable treatment performance regarding SS, BOD, and COD. It should be noted, however, that SS and BOD load removal rates tended to decrease with increasing filtration rate. Although contaminants such as oil balls, vinyl and other plastics, vegetable debris, leaves, pieces of wood, and paper were contained in the cleaning waste water, it was possible to remove them and the performance of high-rate filtration was not affected. Effects of extended use of filter media were investigated. Although slight discoloration was observed on the surfaces of the filter media, no change was observed in shape and size of the filter media. Consequently, no problems were observed after extended use of filter media. A sedimentation test was conducted on cleaning wastewater, which exhibited favorable settling performance. It is surmised that cleaning wastewater can be led to the primary settling tank for successful removal of SS by settlement.
Katsumi Shigemura,Kazushi Tanaka,Takahiro Haraguchi,Fukashi Yamamichi,Mototsugu Muramaki,Hideaki Miyake,Masato Fujisawa 대한비뇨의학회 2013 Investigative and Clinical Urology Vol.54 No.3
Purpose: The objective of this study was to retrospectively investigate postoperative infectious complications (PICs) in our early experience with holmium laser enucleation of the prostate (HoLEP) followed by mechanical morcellation for symptomatic benign prostatic hyperplasia. Materials and Methods: A retrospective review was performed of the clinical data for 90 consecutive patients who underwent HoLEP at our institution between February 2008 and March 2011. All patients were evaluated for the emergence of PICs, including prophylactic antibiotic administration (PAA) and the influence of the kind or duration of PAA on PIC. The details of cases with PICs were also examined. Results: The patients’ mean age was 71 years (range, 50 to 95 years), and their mean prostate volume was 60 mL (range, 2 to 250 mL). There were 7 cases (7.78%) with PICs;in detail, 3 patients were diagnosed with prostatitis, 2 with pyelonephritis, and 2 with epididymitis. Three patients had positive urine cultures: 1 had Serratia marcescens/Proteus mirabilis, 1 had S. marcescens, and 1 had Klebsiella pneumonia; only one case had urological sepsis. Our statistical data showed no significant differences between 2 or fewer days and 3 or more days of PAA and PIC occurrence. There was also no significant effect on PIC occurrence of sulbactam/ampicillin compared with other antibiotics. Conclusions: The results of this retrospective study showed that PIC occurrence did not depend on the duration or the kind of PAA. Further prospective study is necessary for the evaluation and establishment of prophylactic measures for PICs.
Katsumi Sakakibara,Jumpei Taketsugu 한국통신학회 2010 Journal of communications and networks Vol.12 No.1
IEEE 802.11 defines distributed coordination function (DCF), which is characterized by CSMA/CA and binary exponential backoff (BEB) algorithm. Most modifications on DCF so far have focused on updating of the contention window (CW) size depending on the outcome of own frame transmission without considering freezing periods experienced in the backoff interval. We propose two simple but novel schemes which effectively utilize the number of freezing periods sensed during the current backoff interval. The proposed schemes can be applied to DCF and its family,such as double increment double decrement (DIDD). Saturation throughput of the proposed schemes is analyzed by means of Bianchi’s Markovianmodel. Computer simulation validates the accuracy of the analysis. Numerical results based on IEEE 802.11b show that up to about 20% improvement of saturation throughput can be achieved by combining the proposed scheme with conventional schemes when applied to the basic access procedure.