1,721,040 research outputs found
A QoE-aware Joint Resource Allocation Algorithm for Uplink Carrier Aggregation in LTE-Advanced Systems
No full textModeling and analysis of millimeter/sub-millimeter wave indoor communications for multi-gigabit wireless transmission
No full textFor multi-gigabit wireless transmission, this work models and analyzes millimeter/sub-millimeter wave indoor communications. By using the blocking probability to describe the interruption of transmitted signals, this paper evaluates system-level performance and the correlation coefficient between propagation signals. Numerical results reveal that the proposed channel model for multi-gigabit wireless transmission, which uses the blocking probability, is suitable for describing the effect of obstacle blocking in the indoor environment
Radio Resource Management Based on QoE-aware Model for Uplink Multi-Radio Access in Heterogeneous Networks
No full textNonsaturated Throughput Analysis of Coexistence of Wi-Fi and Cellular With Listen-Before-Talk in Unlicensed Spectrum
No full textThis paper analyzes the coexistence performance of Wi-Fi and cellular networks conditioned on nonsaturated traffic in the unlicensed spectrum. Under the condition, the time-domain behavior of a cellular small-cell base station (SCBS) with a listen-before-talk (LBT) procedure is modeled as a Markov chain, and it is combined with a Markov chain which describes the time-domain behavior of a Wi-Fi access point. Using the proposed model, this study finds the optimal contention window size of cellular SCBSs in which total throughput of both networks is maximized while satisfying the required throughput of each network, under the given traffic densities of both networks. This will serve as a guideline for cellular operators with respect to performing LBT at cellular SCBSs according to the changes of traffic volumes of both networks over time.
Performance analysis of OBS networks using the effective bandwidth method
No full textThis article provides a new scheme for the blocking probability evaluation for optical burst switching networks. While several previous articles used mainly links as servers, we consider switches as servers. In order to evaluate the blocking probability at switches, we use the effective bandwidth method. The method shows more accurate results and the accuracy of the method is proven by simulation and numerical analyses
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
위암 환자와 정상 대조군에서의 성호르몬 수용체의 발현율 및 임상적 연관성
No full text학위논문(석사) -- 서울대학교대학원 : 의과대학 임상의과학과, 2024. 2. 김나영.배경: 성호르몬은 위암(GC)의 발생과 예후에 영향을 미친다. 본 연구는 정상 대조군과 위암 환자에서의 성호르몬 수용체 발현을 비교하고, 성별과 같은 환자 특성과의 연관성을 분석하는 것을 목적으로 하였다.
방법: 전향적으로 등록된 총 110명의 환자(위암 74명, 대조군 36명)의 조직에서 면역조직화학(IHC) 및 역전사 중합효소 연쇄반응(RT-PCR)을 이용하여 에스트로젠 수용체 α, β 및 안드로젠 수용체 발현을 측정하였으며, 이들 수용체 발현 양상과 연령, 성별, 헬리코박터 파일로리 감염 상태 및 위암의 조직학적 형태 등을 포함한 환자 특성과의 연관성을 분석하였다.
결과: 위암 조직에서의 에스트로젠 수용체 α, β 및 안드로젠 수용체의 양성률은 면역조직화학에서 각각 64.9%, 78.4%, 60.8%, 역전사 중합효소 연쇄반응에서 각각 41.4%, 27.6%, 48.3%였으며, 대조군에서는 면역조직화학에서 각각 16.7%, 80.6%, 38.9%, 역전사 중합효소 연쇄반응에서 각각 22.2%, 58.3%, 19.4%였고, 면역조직화학 및 역전사 중합효소 연쇄반응 결과는 서로 양의 상관관계를 보였다. 에스트로젠 수용체 α와 안드로
젠 수용체의 발현은 위암과 양의 상관관계를 보인 반면, 에스트로젠 수용체 β는 이와 반대의 양상을 보였다. 면역조직화학 결과, 에스트로젠 수용체 α의 발현은 헬리코박터 파일로리 음성(p<0.001), 미만형 또는 혼합형 위암(p=0.014), 미분화 위암(p<0.001)과 연관되었다. 안드로젠 수용체의 발현은 헬리코박터 파일로리 음성(p<0.001), 분문부 위암(p=0.040), 미분화 위암(p<0.001)과 연관되었다. 성호르몬 수용체의 발현은 성별에 따라서도 차이를 보였는데, 위암 그룹에서 대조군에 비해 남성에서는 높은 에스트로젠 수용체 α 발현이, 여성에서는 높은 안드로젠 수용체 발현이 관찰되었다,
결론: ERα, ERβ 및 AR의 발현율은 IHC 분석 결과 위암 그룹에서 64.9%, 78.4% 및 60.8%, 대조군에서 16.7%, 80.6% 및 38.9%였으며, RT-PCR 결과 위암 그룹에서 41.4%, 58.3% 및 48.3%, 대조군에서 22.2%, 27.6% 및 19.4%였다. ERα 및 AR의 발현율은 위암 그룹에서 더 높았으며, 헬리코박터 음성, 미만형, 혼합형 또는 미분화 조직형과 연관성을 보였으나 ERβ는 그렇지 않았다. 위암 그룹에서 남성에서의 ERα 발현율 및 여성에서의 AR 발현율이 더 높아, 성호르몬 발현율은 성별에 따라서도 차이를 보였다.Background: Sex hormones affect development and prognosis of gastric cancer (GC). This study aimed to compare the sex hormone receptor expression between control and GC, and to evaluate its correlation with characteristics of patients such as sex. Methods: A total of 110 patients (74 with GC, 36 controls) were prospectively enrolled and underwent immunohistochemistry (IHC) and reverse transcription–polymerase chain reaction (RT-PCR) for estrogen receptors (ER) α and β and androgen receptor (AR). The effect of ERs and AR on the clinicopathological characteristics, including age, sex, Helicobacter pylori (HP) infection status, and tumor characteristics were analyzed. Results: The positive rate of ERα, ERβ, and AR in GC tissue was 64.9%, 78.4%, and 60.8% by IHC and 41.4%, 27.6%, and 48.3% in RT-PCR respectively. In control, the positive rate of those was 16.7%, 80.6%, and 38.9% by IHC and 22.2%, 58.3%, and 19.4% in RT-PCR respectively. The IHC and RT-PCR results showed light to fair concordance with each other, and ERα and AR expressions were positively correlated with cancer, while ERβ showed the opposite pattern. ERα expression was correlated with HP negativity (p<0.001), diffuse or mixed-type histology (p=0.014), and undifferentiated histology (p<0.001) by IHC. AR expression was related to HP negativity (p<0.001), cardiac cancer (p=0.040), and undifferentiated histology (p<0.001) by IHC. The expression rate showed differences according to sex. That is, the higher expression rate of ERα in males and that of AR in females seemed to be related with cancer. Conclusion: The expression rate of ERα, ERβ and AR was 64.9%, 78.4% and 60.8% in cancer group and 16.7%, 80.6% and 38.9% in control group using IHC, and 41.4%, 58.3% and 48.3% in cancer group and 22.2%, 27.6% and 19.4% in control group using RT-PCR. The expression rate of ERα and AR was higher in cancer group than in control group, and ERα expression in males and AR expression in females was higher in cancer group than in control group, which may explain the sex-based differences in GC. Keywords: Estrogen receptor, Androgen receptor, Helicobacter pylori, Histology, Prognosis Student Number: 2022-22664Abstract ⅱ
Contents . ⅳ
1. Introduction 5
2. Materials and Methods 6
3. Results 12
4. Discussion . 25
5. Conclusion 27
Bibliography 28
Abstract in Korean 33석
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
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