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      • KCI등재

        Role of Diffusion in the Kinetics of Reversible Enzyme-catalyzed Reactions

        Attila Szabo,Huan-Xiang Zhou 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.3

        The accurate expression for the steady-state velocity of an irreversible enzyme-catalyzed reaction obtained by Shin and co-workers (J. Chem. Phys. 2001, 115, 1455) is generalized to allow for the rebinding of the product. The amplitude of the power-law (t–1/2) relaxation of the free- and bound-enzyme concentrations to steady-state values is expressed in terms of the steady-state velocity and the intrinsic (chemical) rate constants. This result is conjectured to be exact, even though our expression for the steady-state velocity in terms of microscopic parameters is only approximate.

      • KCI등재

        Determination the efficiency of open mixing screws

        Attila Varga,Istvan Keppler,Laszlo Fenyvesi 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.6

        Our goal is the determination of the material flow processes around the mixing screws and introducing a new mixing index which can characterize the performance of open mixing screws. The validation of the new discrete element model is demonstrated by experimental results of our self-developed apparatus. To quantify the mixing efficiency of open mixing screws we use the value of mixed volume around the screws. Sensitivity analysis is used to analyze how the different values of leaf diameter, pitch and angular velocity affect the mixed volume.

      • Poster Session:PS 0503 ; Nephrology : Reasons of Emergency Department Admission of ESRD Patients : A Retrospective Analysis

        ( Attila Aydin ),( Cemile Aydin ),( Selma Karaahmetogluozkan ),( Zeynep Guven ),( Rukiye Kara ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

        Background: End stage renal failure is an increasing clinical problem. That is why we should prevent it and capture patients in earlier stages in order to stop their progression. We should determine the causes of hospitalization and acute complications. Methods: The patients who were hospitalized for End Stage Renal Disease (ESRD) between March 2009-2011 patients were studied. We studied the causes of hospitalization in concern with established parameters. The datas were analyzed in SPSS program. Results: The total number of patients were 98 including 50 men and 48 women. The ages of patients were between 27-93. Chronic Kidney Disease (CKD) duration was 2-240 months, the dialysis duration was 0.5-240 months. The most common cause of emergency department admission was infection 39 (%39.8). The Patients admitted with an infection were taken dialysis treatment longer than other patients (p=0.034) and they had a higher initial hemoglobin level (p=0.002) and were hospitalized longer than the other patients (p=0.047). The most common type of infection was pneumonia (%43.6). The most common cause of mortality was sepsis with %40 and pneumonia with %20. There was no statistically difference in terms of albumin level between patients with infection and the others. Although in the exitus group albumin was statically lower than the survivors (p<0.05). Conclusions: The most common cause of ESRD was infection. The most common cause of mortality was also infection; sepsis and pneumonia. We determined that a low albumin level was a bad prognostic factor.

      • KCI등재

        Psychological Effects of Fast- and Slow-Tempo Music Played during Volleyball Training in a National League Team

        ( Attila Szabo ),( Lorna J. Hoban ) 한국스포츠정책과학원(구 한국스포츠개발원) 2004 International Journal of Applied Sports Sciences Vol.16 No.2

        This study examined whether music could benefit the training experience in a British national league volleyball team. Nine female volleyball players were tested in two identical studies in three different training sessions: control (no music), slow-music, and fast-music. Players` affect and state anxiety were measured before and after each training session. Perceived effort was assessed at halftimes during training, whereas preference for the session was gauged after each session. Feelings of revitalisation and positive engagement have decreased significantly when slow music was played in the background. A similar trend in the control session was also evident. Perceived effort was lower in the fast-tempo music than control session, but it was the lowest during the slow-music training session. Players` preference for training in presence of slow music was significantly lower than their preference for training without any music or with fast music. It is concluded that slow, asynchronous, music impairs the quality of training, but fast-tempo arousing music may enhance the quality of training not necessarily by inducing major changes in affect but primarily by reducing the perception of effort in volleyball training. Therefore, fast music that is synchronised with the movement-rhythm could enhance the quality of training in female volleyball teams.

      • KCI등재

        A History of the Ancient Hungarian Notch‐farming System of Tide Lands at the Walnut Groves of Szatmár County

        Attila Horváth 한국세계문화사학회 2010 세계 역사와 문화 연구 Vol.0 No.22

        역사적으로 중세 헝가리 대평원은, 그 면적의 2/3정도가 하천 간석지로, 경작 적지(適地)가 아니었기에, 오히려 독특한 활용형태로 발전하였다. 18‐19세기 헝가리 대평원과 소평원 대부분의 지역은 (현 헝가리 전체 국토 면적의 1/4에 달하는 지역) 하천 간석지였다. 헝가리 Szatmár 지역의 호두나무 군락지는 Tiszabecs로부터 Vásárosnamény까지 Tisza강을 따라 위치한다. 그 면적은 대략 9500 헥타르로, Szatmár의 전체 경작지에 있는 호두나무의 95%는 Tisza강 하천 간석지에 위치한다. 주변 자연환경적 특성에 적응된, 이 호두나무 지대는 우리가 하천 간석지 농업이라 부르는 복합적인 경작형태의 일부분이다. 이 전통적인 하천 간석지 농업의 핵심을 일명 notch 또는 natural drain‐farming system이라고 부른다. 이런 농업유형의 중요한 특징은 전적으로 자연적 자원들을 인식하고 활용하는 것에 기초하고 있다는 것이다. Notch는 지리학적인 범주일 뿐 아니라, 경제사적인 개념이기도 하다. 자연적인 배수 시스템의 역할, 그 활용 시도와 필요 충족의 결과로 그 가치를 인식하였다. 이러한 의미로 notch‐farming이라 부르는데, 고대 하천 저지대 농업을 위한 가장 중요한 토대를 만들어내었다. 호두나무는 하천 간석지 농업을 하는 사람들에게는 핵심적인 생계수단이었다. 그들에게 호두는 중요한 에너지원이었기 때문이다. 호두 알맹이는 쇠고기보다 약 7배 가량 칼로리가 뛰어나다. 비타민 B1과 B2를 함유하고, 건조된 알맹이는 단백질이 15‐25%, 지방이 50‐72%, 당분이 6‐13%이다. 호두는 훌륭한 현금자산이자, 그 목재는 큰 값어치가 있다. 하천 저지대 농업은 전적으로 자연과 조화를 추구하는 농업형태로, 하천의 범람으로 인해서 인간과 그 환경 사이에 균형을 만들어 내는 것이다. 또한 하천 저지대 농업은 유기농업을 위한 필요조건들을 전적으로 만족시킨다. Tisza강의 범람은 유기물질의 퇴적을 가져오고, 이는 토양을 위한 비료역할을 한다. 범람 이후 진흙은 질소함유량이 높은데, 이는 나무의 가지와 잎의 성장을 돕는다. 화학비료가 전혀 필요하지 않다. 하천의 범람은 토질개선을 위한 아무런 인공적인 조치가 필요치 않다. 퇴적은 토양 가운데 공기의 유통을 가져온다. 또한 범람은 산소부족으로 토양과 나무의 해충들을 제거하기 때문에 화학적인 살충이 필요하지 않다. 환경을 파괴하지 않고 계속해서 유지 가능한 고대의 자연협력적인 농업방식으로의 회귀는 상당히 많은 이점을 가져오리라 확신한다. 오늘날 환경론자들이 자연적인 순환과정을 따르되 절대 통제하려 하지 않는 notch‐farming을 강조하는 것은 우연이 아니다. 환경보호와 더불어 농업을 겸비할 수 있는 유일한 방법은 하천 간석지 농업방식에 대한 재고이다. 이와 같은 유형의 역사적인 경작방식이 카르파텐 분지의 자연적인 토대의 발전과 보호를 동시에 기할 수 있는 것이다. 그러한 경작방식의 붕괴와 사라짐은 자연적인 생태 시스템의 쇠퇴를 의미한다. 카르파텐 분지에서 생태학적으로 지속 가능한 살아있는 환경의 미래는 역사의 흔적이 되어버린 하천 간석지 경작 시스템에 대한 새로운 연구를 통한 자연과 협력하는 것에 달려있다.

      • Software-Defined Networking and Virtualization: The Service Provider Perspective

        Attila Takacs,Elisa Bellagamba,Joe Wilke,DK Lee 에스케이텔레콤 (주) 2013 Telecommunications Review Vol.23 No.5

        An architecture based on software-defined networking (SDN) and virtualization techniques gives operators greater freedom to balance operational and business parameters, such as network resilience, service performance and QoE against the costs. In this work we review our Carrier Cloud as a future mobile network infrastructure that exploits both SDN and virtualization technologies in order to increase the operator agility, reduce the cost, and even disrupt the vendor landscape. We begin with Ericsson’s approach to SDN goes beyond the data center addressing issues in the service provider environment, and move on to network functions virtualization (NFV) as a promising alternative to the legacy network infrastructure. We also reveal there are remaining hurdles of those key technologies to overcome in order to be fully adopted in the Telco world.

      • KCI등재

        Position of Hungarian Merino among other Merinos, within-breed genetic similarity network and markers associated with daily weight gain

        Zsolnai Attila,Egerszegi István,Rózsa László,Mezőszentgyörgyi Dávid,Anton István 아세아·태평양축산학회 2023 Animal Bioscience Vol.36 No.1

        Objective: In this study, we aimed to position the Hungarian Merino among other Merinoderived sheep breeds, explore the characteristics of our sampled animals' genetic similarity network within the breed, and highlight single nucleotide polymorphisms (SNPs) associated with daily weight-gain. Methods: Hungarian Merino (n = 138) was genotyped on Ovine SNP50 Bead Chip (Illumina, San Diego, CA, USA) and positioned among 30 Merino and Merino-derived breeds (n = 555). Population characteristics were obtained via PLINK, SVS, Admixture, and Treemix software, within-breed network was analysed with python networkx 2.3 library. Daily weight gain of Hungarian Merino was standardised to 60 days and was collected from the database of the Association of Hungarian Sheep and Goat Breeders. For the identification of loci associated with daily weight gain, a multi-locus mixed-model was used. Results: Supporting the breed's written history, the closest breeds to Hungarian Merino were Estremadura and Rambouillet (pairwise FST values are 0.035 and 0.036, respectively). Among Hungarian Merino, a highly centralised connectedness has been revealed by network analysis of pairwise values of identity-by-state, where the animal in the central node had a betweenness centrality value equal to 0.936. Probing of daily weight gain against the SNP data of Hungarian Merinos revealed five associated loci. Two of them, OAR8_17854216.1 and s42441.1 on chromosome 8 and 9 (–log10P>22, false discovery rate<5.5e-20) and one locus on chromosome 20, s28948.1 (–log10P = 13.46, false discovery rate = 4.1e-11), were close to the markers reported in other breeds concerning daily weight gain, six-month weight, and post-weaning gain. Conclusion: The position of Hungarian Merino among other Merino breeds has been determined. We have described the similarity network of the individuals to be applied in breeding practices and highlighted several markers useful for elevating the daily weight gain of Hungarian Merino.

      • HYBRID CAPTURE??: A NEW TECHNOLOGY FOR HPV DETECTION

        Lorincz, Attila 가톨릭중앙의료원 가톨릭암센터 1994 암심포지움 Vol.- No.1

        Hybrid Capture is a rapid and sensitive chemiluminescence-based test for detecting human papillomavirus(HPV) DNA in clinical specimens. The assay utilizes the high specificity of RNA probes to detect the DNAs of 16 common anogenital HPV types and to distinguish between oncogenic(types 16,18,31,33,35,39,45,51,52,56 and 58) and non-oncogenic(types 6,11,42,43 and 44) HPVs. The test has a simple format similar to an immunoassay and provides quantitative results in approximatel 4 hours. With minimal training, a laboratory technologist can use Hybrid Capture to analyze over 100 clinical specimens in one day. The new test has shown good accuracy, precision and reproducibility in several multicenter trials involving cervical specimens from over 500 women. Hybrid Capture has demonstrated clinical utility in the management of women with equivocal results on Pap smear. In one study of 216 women, positivity for HPV DNA was associated with a greatly increased likelihood(OR=23, 3-176) of high-grade cervical intraepithelial neoplasia(CIN). A second study of over 400 women with equivocal or low-grade Pap smears has confirmed these results. A cohort of women with no current or past history of cervical intracpithelial lesions has been followed for a median of 3.5 years. Initially, 600 were HPV DNA positive and 7,600 were HPV DNA negative. The relative risk of developing CIN in the HPV-positive women was over 20, with an absolute risk for CIN of over 25%. Of 98 women positive for HPV 16 DNA, approximately 40% developed CIN during followup. The period of highest risk for CIN was within the first two years. By 4 years, the risk for CIN had decreased over 15-fold to almost control levels.

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