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Sait, Khalid Hussain,Anfinan, Nisrin Mohammad,Eldeek, Basem,Al-Ahmadi, Jawher,Al-Attas, Maha,Sait, Hesham Khalid,Basalamah, Hussain Abdullah,Al-Ama, Nabeel,El Sayed, Mohamed Ezzat Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.6
Background: To evaluate the perception of cancer patients toward treatment services and influencing factors and to inquire about the use of complementary alternative medicine (CAM). Materials and Methods: Information was obtained through pre-tested structured questionnaires completed by cancer patients during treatment at King Abdulaziz University Hospital, Jeddah, Saudi Arabia. Results: Of 242 patients, 137 (64.6%) accepted to enter this study. Most were Saudi (n=93, 68%), female (n=80, 58%), educated at university (n=71, 52%), married (n=97, 72%) and with breast cancer (n=36, 26%). One-hundred (73%) patients were satisfied with the services provided; 61% were Saudi. Ninety-four (68%) respondents were satisfied with the explanation of their cancer. Twenty-eight (21.6%) patients received CAM, of them 54.0% received herbal followed by rakia (21.0%), nutritional supplements/vitamins (7.0%) and Zamam water (18.0%), with significant differences among them (p =0.004). Seven (5%) patients believed this therapy could be used alone; 34 (25%) patients believed it could be used with other treatments, regardless of whether they themselves used this therapy. Fifty-three (53%) satisfied patients felt they received enough support; 31 (58%) patients received support from family and friends; 22 (41.6%) patients received support from the health-care team. Patients who received information about their disease from their physicians and those who felt they had enough support were more satisfied. The patients who took alternative treatment were older age, mostly female and highly educated but values did not reach significance. Conclusions: We stress enhancing the educational and supportive aspects of cancer-patient services to improve their treatment satisfaction and emphasize the need for increasing the educational and awareness programs offered to these patients.
Wear Characterization of Reinforced Polyurethane Composites Produced via Vacuum Casting
Sait Kocak,Yavuz Kaplan 한국고분자학회 2021 폴리머 Vol.45 No.6
In recent years, research relating to polyurethane has been growing because of the lightness, low cost, and favorable mechanical properties of this material. The increased usage areas of polyurethane in tribological systems make it very important to determine its wear behavior. This study focuses on the wear characterization of polyurethane composites reinforced with glass fiber, SiC, and Al₂O₃. The wear tests were carried out using a pin-on-disc test apparatus against an abrasive counter-face at different applied loads (5 and 10 N). Scanning electron microscopy was used to observe the damage on the worn surfaces. The wear experiments clearly demonstrated that the reinforcement materials significantly affected the tribological properties of the polyurethane composites. In addition, it was observed that particle reinforcement was more effective than fiber reinforcement under experimental conditions. Consequently, polyurethane with glass fiber, SiC, and Al₂O₃ fillers would be a suitable candidate for use in tribological applications.
( Sait Byul Park ),( In Ae Lee ),( Joo Won Suh ),( Jeong Gu Kim ),( Choong Hwan Lee ) 한국미생물 · 생명공학회 2011 Journal of microbiology and biotechnology Vol.21 No.12
Xanthomonas oryzae pv. oryzae (Xoo) is the most devastating pathogen to Oryza sativa and has been shown to cause bacterial blight. Two bioactive compounds showing antimicrobial activities against Xoo strain KACC 10331 were isolated from a Streptomyces bottropensis strain. The ethyl acetate extract was fractionated on a Sephadex LH-20 column, and then purified by preparative HPLC. The purified compounds were identified as bottromycin A2 and dunaimycin D3S by HR/MS and 1H NMR analyses. The MIC value against Xoo and the lowest concentration still capable of suppressing rice bacterial blight were 2 μg/ml and 16 μg/ml for bottromycin A2, and 64 μg/ml and 0.06 μg/ml for dunaimycin D3S, respectively. These two compounds were shown to exert different bioactivities in vitro and in rice leaf explants.
벼의 생엽절편을 이용한 병원균 억제물질의 대량 스크리닝 방법 개발
박샛별 ( Sait Byul Park ),이충환 ( Choong Hwan Lee ),김태종 ( Tae Jong Kim ),강린우 ( Lin Woo Kang ),이병무 ( Byoung Moo Lee ),김정구 ( Jeong Gu Kim ) 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 2012 한국미생물·생명공학회지 Vol.40 No.1
A new method for the high throughput screening of antagonistic substances against rice pathogens using rice leaf explants was developed. This method can be used to confirm the activities of any compound or mixture suppressing rice bacterial blight (BB) before field tests. Xanthomonas oryzae pv. oryzae (Xoo) culture medium was distributed in 96 well plates with equally sized explants and the active compounds were added to the wells. The strength suppressing BB was converted into an area percent of the lesion on the rice explants. The explants under BB suppressing activity remained uninfected maintaining their actual green color, while infected explants exhibited pale yellow-colored lesions. Based on the results, this method seems to be faster and easier, dose-dependent, and can be performed all-at-once with a small amount of unspecified compounds. This method also has the potential to be applied to inspection activities for the suppression of other waterborne crop diseases.
Mahmut Sait Okyay,Bumseop Kim,Noejung Park 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
All-optical helicity-dependent switching of magnetism has attracted broad attention from the perspective of non-magnetic fast control of spins. We examine ultrafast spin dynamics of two-dimensional non-magnetic semiconductors, particularly focusing on alteration of material’s time-reversal and valley symmetries driven by a circularly polarized light. Monolayer MoS₂ was selected as an exemplary system and the real-time time-dependent density functional theory (rt-TDDFT) calculations were carried out, together with a model Hamiltonian analysis. As a distinction from some of the previous reports, this study was circumscribed to the non-excitonic regime, i.e., an interval of frequency values below the band gap. 〈그림 본문참조〉 Our real-time ab initio calculations show that a circularly polarized light can induce a net magnetization in a non-magnetic two-dimensional material. We demonstrate that the magnetic responses are particularly amplified when the applied electric fields are in resonance with the spin-flipping band transition between valence and conduction bands through the second harmonic of the light. We forecast that a tunable spin dynamics can be achieved from these non-magnetic semiconductors when the light of the resonant frequency is combined with a proper setting of a few parameters such as field strength, pulse duration and the magnitude of spin-orbit coupling.
Celik, Sait,Ozkaya, Ahmet 생화학분자생물학회 2002 Journal of biochemistry and molecular biology Vol.35 No.6
The aim of our study was to investigate the protective effects of intraperitoneally-administrated vitamin E, dl-alpha lipoic acid, and linalool on the level of total lipid and fatty acid in guinea pig brains with oxidative stress that was induced by $H_2O_2$. The total brain lipid content in the $H_2O_2$ group decreased when compared to the $H_2O_2$ + vitamin E (p<0.05), $H_2O_2$ + linalool (p<0.05), ALA (p<0.05), control (p<0.01), linalool (p<0.01), and vitamin E (p<0.01) groups. While the proportion of total saturated fatty acid (${\Sigma}SFA$) in the $H_2O_2$ group significantly increased (p<0.005) when compared to the vitamin E group, it only slightly increased (p<0.01) when compared to the control and $H_2O_2$ + vitamin E groups. The ratio of the total unsaturated fatty acid (${\Sigma}USFA$) in the $H_2O_2$ groups was lower (p<0.05) than the control, vitamin E, and $H_2O_2$ + vitamin E groups. The level of the total polyunsaturated fatty acid (${\Sigma}PUEA$) in the $H_2O_2$ group decreased in when compared to the control, vitamin E, and $H_2O_2$ + vitamin E groups. While the proportion of the total w3 (omega 3), w6 (omega 6), and PUFA were found to be lowest in the $H_2O_2$ group, they were slightly increased (p<0.05) in the lipoic acid group when compared to the control and $H_2O_2$ + lipoic acid groups. However, the level of ${\Sigma}SFA$ in the $H_2O_2$ group was highest; the level of ${\Sigma}USFA$ in same group was lowest. As the proportion of ${\Sigma}USFA$ and ${\Sigma}PUFA$ were found to be highest in the linalool group, they were decreased in the $H_2O_2$ group when compared to the control group. Our results show that linalool has antioxidant properties, much the same as vitamin E and lipoic acid, to prevent lipid peroxidation. Additionally, vitamin E, lipoic acid, and linalool could lead to therapeutic approaches for limiting damage from oxidation reaction in unsaturated fatty acids, as well as for complementing existing therapy for the treatment of complications of oxidative damage.
김샛별(Sait-Byul Kim),이상현(Sang-Hyun Lee),홍성수(Sung-Soo Hong),김진환(Jin-Hwan Kim),오동성(Dong-Seong Oh),한상규(Sang-Kyoo Han) 전력전자학회 2011 전력전자학술대회 논문집 Vol.2011 No.7
본 논문에서는 높은 승압비를 갖는 전압 클램프 탭인덕터 부스트 컨버터를 제안한다. 기존의 탭인덕터 부스트 컨버터 방식은 높은 승압비를 얻기 위해 사용되었던 탭인덕터로 인하여 일반적인 부스트 컨버터에 비해 주스위치와 다이오드의 전압스트레스가 크다는 단점이 있다. 또한, 누설 인덕터 성분과 기생 캐패시터로 인해 발생하는 공진 전압을 없애기 위해 손실스너버를 사용함으로 전력변환효율이 떨어지는 단점을 갖는다. 반면, 제안된 방식은 손실 스너버 없이 전압 클램핑 캐패시터를 사용하고 있다. 이 캐패시터는 주스위치 및 다이오드의 전압 스트레스를 줄이는 기능을 제공하게 된다.
Optimization of Machining Parameters of GFRP Pipes using Evolutionary Techniques
Abdullah Naveen Sait 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
Near net shaped components of GFRP materials are obtained only through machining. This work is an attempt to optimize the machining parameters of GFRP pipes by evolutionary techniques. GFRP pipes made by both hand lay up as well as filament wound process are considered. Experiments were conducted based on taguchi’s technique and a combined objective is formed based on assumed weightage for individual parameters to minimize surface roughness, machining force and tool wear. In this paper the experimentally collected data are optimized through Particle Swarm Optimization (PSO) and Genetic Algorithm (GA). The results are analyzed and also compared with the traditional optimization technique.