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RISS 인기검색어
- 검색키워드
- 저자 : Tsuboyama, Tadao (검색결과 2 건)
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Charge Collection Efficiency Study of Silicon Microstrip Sensors
D. H. Kah,H Park,Y.-J. Kim,T. Tsuboyama 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.8
The charge collection efficiencies (CCEs) of various AC-coupled single-sided silicon microstripsensors were measured to find an optimal sensor design for different readout methods. A 820 nmwavelength pulsed laser was used as a light generation source to study the responses of the prototypemicrostrip sensors. Five different microstrip sensors of two types (A and B) were designed for thispurpose and were fabricated on high resistivity and n-type silicon wafers. The readout pads intypes A and B were located inside and outside the guard ring surrounding the active sensor area,respectively. The sensors at an operating voltage of 80 V were irradiated by using a pulsed laser,producing 22000 electron-hole pairs per pulse. The signals, ADC counts, were measured bymoving the sensors while maintaining the laser in a fixed position. The CCEs for 10 differentmicrostrip sensors were calculated from the maximum and the minimum ADC counts in eachdesigned microstrip sensor. This study showed that the hit-position dependences of the signalsand the CCEs for the three different readout methods were well evaluated by using a pulsed laserwithout using charged particles from accelerators.
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Tatematsu, Noriatsu,Park, Moonhwa,Tanaka, Eiji,Sakai, Yoshiharu,Tsuboyama, Tadao Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1
Background: Postoperative complications after esophagectomy can lead to considerable patient discomfort and prolonged length of hospital stay. Lack of physical activity can be one of the independent risk factors for postoperative complications because physical activity is closely related to physical function. The objective of this study was to determine whether physical activity among esophageal cancer patients decreases their risk of postoperative complications after esophagectomy. Materials and Methods: We investigated 51 consecutive patients with newly diagnosed resectable esophageal cancer who were scheduled to receive esophagectomy between January 2009 and November 2011. Demographic, clinicopathologic, and treatment information were recorded and physical function was measured. The last 7-days short version of the International Physical Activity Questionnaire was used to assess physical activity before the operation. Stepwise multiple logistic regression analysis was used to determine whether preoperative physical activity is related to the risk of postoperative complications. Results: Male gender [OR 18.6, (95%CIs: 1.2-284.4); P=0.035], 3-field lymph node dissection (OR 9.6, [95%CIs: 1.4-66.6]; P=0.022), low-level physical activity (OR 28.3, [95%CIs: 3.5-227.7]; P=0.002), and preoperative comorbidities [OR 5.9, (95%CIs: 1.1-31.5); P=0.037] were found to be independently associated with postoperative complications. Conclusions: The present study shows that low-level physical activity, preoperative comorbidities, and 3-field lymph node dissection are independent and significant risk factors for postoperative complications after esophagectomy. Although further study is required, maintaining high-level physical activity preoperatively may decrease the risk of postoperative complications.
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