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선형가속기 10 MV 광자선에서 산란판(Beam Spoiler) 사용 시 표면선량 변화
배성철,김준호,이철수,Bae, Seong-Cheol,Kim, Jun-Ho,Lee, Choul-Soo 대한방사선치료학회 2006 대한방사선치료학회지 Vol.18 No.1
Purpose: The purpose of this study is to find a optimal beam spoiler condition on the dose distribution near the surface, when treating a squamous cell carcinoma of the head and neck and a lymphatic region with 10 MV photon beam. The use of a optimal spoiler allows elivering high dose to a superficial tumor volume, while maintaining the skin-sparing effect in the area between the surface to the depth of 0.4 cm. Materials and Methods: The lucite beam spoiler, which were a tissue equivalent, were made and placed between the surface and the photon collimators of linear accelerator. The surface-dose, the dose at the depth of 0.4 cm, and the maximum dose at the dmax were measured with a parallel-plate ionization chamber for $5{\times}5cm\;to\;30{\times}30cm^2$ field sizes using lucite spoilers with different thicknesses at varying skin-to-spoiler separation (SSS). In the same condition, the dose was measured with bolus and compared with beam spoiler. Results: The spoiler increased the surface and build-up dose and shifted the depth of maximum dose toward the surface. With a 10 MV x-ray beam and a optimal beam spoiler when treating a patient, a similer build-up dose with a 6 MV photon beam could be achieved, while maintaining a certain amount of skin spring. But it was provided higher surface dose under SSS of less than 5 cm, the spoiler thickness of more than 1.8 cm or more, and larger field size than $20{\times}20cm^2$ provided higher surface dose like bolus and obliterated the spin-sparing effect. the effects of the beam spoiler on beam profile was reduced with increasing depths. Conclusion: The lucite spoiler allowed using of a 10 MV photon beam for the radiation treatment of head and neck caner by yielding secondary scattered electron on the surface. The dose at superficial depth was increased and the depth of maximum dose was moved to near the skin surface. Spoiling the 10 MV x-ray beam resulted in treatment plans that maintained dose homogeneity without the consequence of increased skin reaction or treat volume underdose for regions near the skin surface. In this, the optimal spoiler thickeness of 1.2 cm and 1.8 cm were found at SSS of 7 cm for $10{\times}10cm^2$ field. The surface doses were measured 60% and 64% respectively. In addition, It showed so optimal that 94% and 94% at the depth of 0.4 cm and dmax respectively.
고교 야구선수의 삼분법적 자기효능감이 심리적 욕구, 자기결정동기, 집단효능감에 미치는 영향
배성철(Bae, Seong-cheol),송용관(Song, Yong-gwan) 한국사회체육학회 2022 한국사회체육학회지 Vol.- No.87
Purpose: Grounded in tripartite efficacy theory (TET), the purpose of this study is to investigate the relations among collective efficacy, self-determined motivation, basic psychological needs and tripartite efficacy on high school baseball athlete students. Method: To this end, four-hundred eleven athlete students participated in this study by completing the pack of questionnaire tapping the targeted variables. To test the research hypotheses, SPSS and AMOS statistical programs were used. Results: The results showed that first, self-efficacy (i.e., confidence in their own capabilities) within tripartite efficacy was positively related to psychological need satisfaction, autonomic motivation and collective efficacy of the baseball players. Second, the relation-inferred self-efficacy (i.e., their coach’s confidence in their ability as an athlete) was positively associated with competence and relatedness within basic psychological needs, and autonomic and controlling motivation, whereas it was negatively associated with autonomy and amotivaition. It also was negatively associated with collective efficacy. Conclusion: Overall, the other-efficacy (i.e., their confidence in their coach’s ability) was positively associated with autonomy, relatedness and collective efficacy, whereas it was negatively associated with competence, controlling motivation and amotivation. Further details and future directions remain to be discussed.
배성철 ( Seong Cheol Bae ),신승훈 ( Seung Hoon Shin ),김기왕 ( Ki Wang Kim ) 대한한의학원전학회(구 대한원전의사학회) 2011 대한한의학원전학회지 Vol.24 No.3
The acupuncture procedures in Hwangjenaekyung (黃帝內經) was different to modern ones in many aspects. Especially, the role of pulse diagnosis in acupuncture was totally different and the pulse diagnosis was essential part in acupuncture therapy in Hwangjenaekyung era. We found four noteworthy features on the pulse diagnosis before and after acupuncture in Hwangjenaekyung: ① Pulse diagnosis was a mandatory process in acupuncture ② Doctors who used pulse diagnosis in 12 meridians (十二經脈遍診脈法), pulse diagnosis in 9 points of 3 body parts (三部九候脈法), and comparative pulse diagnosis between radial artery and carotid artery (人迎寸口對比脈法) followed the former rule (①). ③ The major pulse features to detect before and after acupuncture were conversion between the vacuous pulse (虛脈) and the replete pulse (實脈), and conversion between slippery pulse (滑脈) and rough pulse (澁脈). ④ Deukki (得氣, Deqi) was synonym of Kiji (氣至), and it referred to the changes of arterial pulse, not the sensation followed by acupuncture manipulation.
터널링 자기저항 소자의 교류 전압 및 주파수 의존성 연구
배성철(Seong-Cheol Bae),윤석수(Seok Soo Yoon),김동영(Dong Young Kim) 한국자기학회 2016 韓國磁氣學會誌 Vol.26 No.6
In this report, we measured the impedance spectrum in TMR device, and the relaxation behavior of the real and imaginary impedance spectrum was analyzed by using the equilibrant circuit of tunneling capacitance (C<SUB>T</SUB>) and tunneling resistance (R<SUB>T</SUB>). The relaxation frequency was increased with AC voltage in both the parallel and antiparallel alignment of two magnetic layers. The R<SUB>T</SUB> with AC voltage showed the typical bias voltage dependence. However, the C<SUB>T</SUB> showed large value than the expected geometrical capacitance. The huge increase of C<SUB>T</SUB> was affecting as a limiting factor for the high speed operation of TMR devices. Thus, the supercapacitance of C<SUB>T</SUB> should be considered to design the high speed TMR devices.
임상에서 사용된 치과용 Ni-Ti합금 파일의 피로파괴현상
최한철 ( Han Cheol Choe ),배성철 ( Seong Chul Bae ),고영무 ( Yeong Mu Ko ),황호길 ( Ho Keel Hwang ) 대한금속재료학회 ( 구 대한금속학회 ) 2006 대한금속·재료학회지 Vol.44 No.6
The purpose of this study was to investigate the fatigue fracture phenomena of clinically used dental Ni-Ti alloy files. ProTaper(R)(Maillfer, Dentsply, Ballaigues, Switzerland) were used, respectively, for experiment. In order to observe the fatigue surface of clinically used file, the fractured files were classified into three groups: fractured files at the upper, middle and lower part after clinical use. The fractured surface and chemical composition were studied with energy dispersive X-ray spectroscopy(EDS) and field emission scanning electron microscope(FE-SEM) to analyze elements on the surface of fractured file. Fatigue fracture crack of Ni-Ti file was initiated and propagated at defects such as scratch formed by machine under repeated load. Fractured surface of Ni-Ti file showed the brittle fracture behavior at the exterior and ductile fracture behavior at the interior of specimen. The ductile fracture behavior appeared predominantly at the lower part of Ki-Ti file compared with at the upper part of Ni-Ti file.
동아시아 고문헌에 나타난 정액의 생성 및 이동 경로 -측면 장부도를 중심으로-
신승훈 ( Seung Hoon Shin ),배성철 ( Seong Cheol Bae ),김기왕 ( Ki Wang Kim ) 대한한의학원전학회 ( 구 대한원전의사학회 ) 2012 대한한의학원전학회지 Vol.25 No.2
Objective: Due to the tendency of researchers to avoid anatomical approach to East Asian medical classics, their ideas on seminal pathways have not been clearly reconstructed yet. So we tried to concretely reconstruct the pathway of semen described in ancient East Asian classics. Methods: Besides analysing the literal description about seminal pathways, we gathered and classified the ancient Viscera Drawings drawn in East Asian countries-especially the drawings in lateral view, and morphologically analysed them with some literal material. Results: We found that there were 3 major streams in the ancient Asian ideas on the seminal pathways. The first one was the modality originated from Hwangjenaegyeong(黃帝內經), which suggested the semen flew out of the kidney. The second one was the modality arose under the influence of Taoist thinking, which suggested the semen was originated from the brain and spinal cord. The last one was revision of the first modality by Janggaebin(張介賓), which asserted semen was originated from the kidney, but was ejaculated via Myeongmun(命門). Conclusion: On the seminal pathways, there had been 2 types of ideas focussing on kidney and one idea focussing on brain and spinal cord in East Asian tradition.