多个斯威林4型目标输出信号近似服从高斯分布研究

为了将对瑞利目标的检测与分辨方法应用于多个斯威林4型目标的检测与分辨,该文主要研究了多个斯威林4型目标存在时输出信号近似为高斯分布的条件。首先推导了多个斯威林4型目标存在时雷达接收机输出信号的概率分布;在此基础上,通过仿真获得了输出信号近似为高斯分布的条件,即多个目标中回波功率最大的两个目标的信噪比相差不大于7dB。

对多个斯威林4型目标的检测及估计

首先分析了两个斯威林4型目标情况下单脉冲雷达接收机输出信号近似为高斯分布的条件,得到了与现有文献稍有不同的结论;接着研究了多个目标下输出信号近似为高斯分布的条件;在近似条件下,提出采用最大似然估计加最小描述长度算法对多目标进行检测及分辨。仿真结果证实在得到的近似条件下采用上述检测及估计算法是可行的。

浅谈澳大利亚斯威本科技大学硕士研究生的课程教学

本文以作者在澳大利亚斯威本科技大学的留学经历,简要介绍斯威本科技大学的基本情况,硕士研究生的课程教学(视觉传媒设计专业),硕士研究生课程的师资情况以及澳大利亚斯威本科技大学设计学院硕士研究生课程特点,为我院的硕士研究生教学提供一些可以借鉴的信息。

斯威斯卓预判性技术伦理研究

斯威斯卓预判性技术伦理是预判性技术伦理的一种典型进路。深刻揭示了斯威斯卓预判性技术伦理的形而上学基础和伦理旨趣,深入阐述了斯威斯卓预判性技术伦理建构的公众伦理辩论结构和详细分析了它开发的四种公众伦理辩论模式,即后果论的辩论、义务论的辩论、正义的辩论和"好的生活"伦理的辩论。斯威斯卓预判性技术伦理有效克服了科林格里奇困境,为分析和识别新技术和尚在研发中的技术蕴含的伦理问题提供了新的路径。

斯威斯卓技术责任伦理思想研究

在技术哲学伦理转向和欧美负责任创新研究兴起的背景下,斯威斯卓提出了自己独具特色的、面向技术社会角色的前瞻性技术责任伦理思想。斯威斯卓技术责任思想认为,应拓展工程师和科学家的责任,请其为技术的社会角色尽责(尽前瞻性责任)。斯威斯卓还为工程师和科学家开发出一种实用的、富有特色的尽责方法。斯威斯卓技术责任伦理思想呈现出前瞻性、实践性和预测性特质,它开辟了一条新的技术责任伦理进路。

斯威士兰

地理概况 在非洲大陆南端,南非和莫桑比克南部交界地区夹着一个小国,这就是斯威士兰王国。来自世界各地的游客,在经历了非洲其它地区的干旱沙漠、燥热气候之后,进入这松柏参天、绿草如茵的国度,真有进入沙漠绿州之感。难怪许多游客都把斯威士兰喻为“非洲的瑞士”。其实,除了在现代化方面逊色外,斯威士兰的秀丽风光和宜人气候真的堪与瑞士媲美,游人的比喻并非言过其实。

反舰导弹武器系统的跟踪系统作战反应时间分析

由于跟踪系统搜索,截获和跟踪目标反应时间服从斯威林分布,在利用蒙特卡洛法对连续随机变量进行模拟时,采用了ITM逆转方法。运用上述方法对反舰导弹武器系统的跟踪系统作战反应时间进行分析研究,得到了较好的仿真结果。

在线教育:挑战与机遇

在澳大利亚,有专门的高等教育质量保证署监管高等教育的办学者,以保证质量和确定标准,从而让学生能够在任何澳大利亚高等教育学校那里都能获得高质量的教育。斯威本科技大学与Seek公司合作成立了斯威本在线,负责斯威本科技大学的在线教育。优秀的在线教育要充分考虑学习者的已有经验,采用合作学习等合适的教学模式并提供学生支持,通过严格的质量保证流程,开发一次设计、多次使用的教学流程从而降低成本,为学生的学习搭建脚手架,在设计时确定目标,并据此设计交互活动等。在线教育的教师要具备丰富的在线教学经验。斯威本科技大学希望到2020年能够有50%的课程实现在线教学,从而增加教育的机会并提高教育的灵活性和个性化。

目标起伏特性对雷达威力性能的影响分析

介绍了典型雷达目标RCS起伏模型,阐述了起伏目标在实际中的应用,建立了目标损耗和雷达作用距离之间的关系,为不同目标的等效替代推算提供了理论依据。验证了雷达目标满足卡平方分布时发现概率和起伏因子之间的关系。并针对不同类型的起伏目标,建立了雷达探测距离和发现概率之间的关系,为雷达的威力检测和飞行目标的航线设计提供依据。

雷达目标检测概率简化算法及应用分析

介绍了典型雷达目标的RCS起伏模型,阐述了由雷达目标起伏造成的信噪比损失,分析了雷达发现概率、虚警概率和信噪比之间的关系,绘制了仿真曲线。对非起伏目标和起伏目标之间在相同检测概率下的所需信噪比的不同,给出了一种等效算法,并针对非起伏目标的检测概率复杂度大的问题,给出了一种简化模型,并对简化后的误差进行了分析,最后对模型在雷达检飞试验中的应用进行了简要分析。

雷达威力检测中替代等效推算方法研究

介绍了替代等效推算方法,讨论了替代等效推算方法在雷达检飞试验中的应用。以目标χ2分布起伏统计模型来定义的五类典型的雷达目标,设计了雷达威力检测的模型,给出了雷达威力试验中不同飞行合作目标间替代等效推算关系,并对其应用进行了分析,为替代等效推算方法在靶场雷达检飞中的应用奠定了理论基础,在雷达检飞试验中具有一定的实际意义。

Prediction Method Study on the Remaining Useful Life of Plant New Varieties Rights Based on Weibull Survival Function and Gaussian Model——Taking Hybrid Rice Variety for Example

In view of the difficulty in determining remaining useful life of plant new variety right in economic analysis, Weibull Survival Analysis Method and Gaussian Model to were used to study how to accurately estimate the remaining useful life of plant new variety right. The results showed that the average life of the granted rice varieties was 10.013 years. With the increase of the age of plant variety rights, the probability of the same residual life Ttreaching x was smaller and smaller, the reliability lower and lower, while the probability of the variety rights becoming invalid became greater. The remaining useful life of a specific granted rice variety was closely related to the demonstration promotion age when the granted rice variety reached its maximum area and the appearance of alternative varieties, and when the demonstration promotion age of the granted rice variety reaching the one with the maximum area, the promotion area would be decreased once a new alternative variety appeared, correspondingly with the shortening of the remaining useful life of the variety. Therefore, Weibull Survival Analysis Method and Gaussian Model could describe the remaining useful life＇s time trend, as well as determine the remaining useful life of a concrete plant variety right, clarify the entire life time of varieties rights, and make the economic analysis of plant new varieties rights more accurate and reasonable.

Plasma von Willebrand factor level as a prognostic indicator of patients with metastatic colorectal carcinoma

AIM:To evaluate the correlations of plasma von Willebrand factor (vWF) level with the distant metastasis and prognosis of patients with colorectal cancer. METHODS: A total of 86 patients with historically confirmed metastatic colorectal cancers receiving treatment at Taipei Veterans General Hospital were enrolled. All patients had measurable metastatic lesions and life expectancies of more than 3 mo. Plasma vWF levels were measured by immuno-turbidimetric assay and compared with results from 40 non-metastatic colorectal cancer patients and 22 healthy controls. Patients with metastatic colorectal cancer were divided into two groups according to serum vWF levels and the differences between these two groups were analyzed using X2 test. Data on age, gender, performance status, location of primary tumor, extent of metastasis, site of metastases, histological differentiation, serum CEA and plasma vWF levels were analyzed to determine association with survival. Survival curves were constructed by Kaplan-Meier product limit method and the data was analyzed using log-rank test on a microcomputer. Multivariate analysis using the Cox's proportional hazards regression model was then performed to determine the independent prognostic indicators among all of the possible variables. RESULTS: Colorectal cancer patients were identified as having significantly higher plasma vWF concentrations than healthy controls (P<0.05). Moreover, higher vWF plasma levels were associated with advanced tumor stage (P<0.05) and the presence of multiple metastases (P=0.014). Patients with lower vWF plasma levels (≤160%) survived significantly longer than those with a higher plasma vWF level (log-rank test, P= 0.0043). By multivariate analysis, plasma vWF levels (P<0.001), the extent of metastasis (P= 0.012), and the performance status (P=0.014) were identified as independent prognostic factors. CONCLUSION: Our data indicates that high plasma vWF concentrations correlate with advanced diseases and significantly poor prognosis of patients with metastatic colorectal carcinoma. It may serve as a potential biological marker of disease progression in these patients.

The inextricable perplexity： Simple analysis on the theme of Ulysses

Joyce began his literary career with strong discontent with his social condition. Ulysses is Joyce＇s optimum work, which takes 3 Dublin characters＇ experience in one day as the main line to show the paralysation and crisis of the whole Western society, people＇s emptiness on their minds, loneliness on their feelings and labefaction on their spirits, also, it showed the inextricable perplexity. To treat the theme of inextricable perplexity, this paper is trying to set about the inextricable Catholic Church and identity problems, with the ideas of Alick West-the outstanding English Marxist literary critic of the 20th century.

Non-steroidal anti-inflammatory drugs and statins in relation to colorectal cancer risk

AIM： To investigate the association between individual or combined use of non-steroidal anti-inflammatory drugs （NSAIDs） or statins and colorectal cancer risk.METHODS： In a population-based case-control study in women, we examined the association between NSAIDs and statin use and the risk of colorectal cancers. We further investigated whether the use of statins modifies the protective effect of NSAIDs. Female cases （n = 669）of colorectal cancer aged 50-74 years were identified from a storewide registry in Wisconsin during 1999-2001. Community control women （n = 1375） were randomly selected from lists of licensed drivers and Medicare beneficiaries. Medication use and risk factor information were gathered during a structured telephone interview. A multivariable logistic regression model was used to calculate odds ratio （OR） and 95% confidence interval （CI）.RESULTS： Overall, NSAIDs users had a 30% reduction in risk of colorectal cancer （95% CI： 0.56-0.88）. Statin use was not associated with colorectal cancer risk （OR = 1.17, 95% CI： 0.74-1.85）, regardless of structural type （lipophilic or hydrophilic）, duration of use, or recency. There was no evidence of an interaction between NSAIDs and statins and colorectal cancer risk （P-interaction = 0.28）.CONCLUSION： Although our results confirm the inverse association between NSAIDs use and colorectal cancer risk, they do not support a risk reduction in statin users, or an interaction effect of combined NSAIDs and statin use.

Relevance of proteolysis and proteasome activation in fatty liver graft preservation: An Institut Georges Lopez-1 vs University of Wisconsin appraisal

To compare liver proteolysis and proteasome activation in steatotic liver grafts conserved in University of Wisconsin (UW) and Institut Georges Lopez-1 (IGL-1) solutions.METHODSFatty liver grafts from male obese Zücker rats were conserved in UW and IGL-1 solutions for 24 h at 4 °Cand subjected to “ex vivo” normo-thermic perfusion (2 h; 37 °C). Liver proteolysis in tissue specimens and perfusate was measured by reverse-phase high performance liquid chromatography. Total free amino acid release was correlated with the activation of the ubiquitin proteasome system (UPS: measured as chymotryptic-like activity and 20S and 19S proteasome), the prevention of liver injury (transaminases), mitochondrial injury (confocal microscopy) and inflammation markers (TNF 1 alpha, high mobility group box-1 (HGMB-1) and PPAR gamma), and liver apoptosis (TUNEL assay, cytochrome c and caspase 3).RESULTSProfiles of free AA (alanine, proline, leucine, isoleucine, methionine, lysine, ornithine, and threonine, among others) were similar for tissue and reperfusion effluent. In all cases, the IGL-1 solution showed a significantly higher prevention of proteolysis than UW (P < 0.05) after cold ischemia reperfusion. Livers conserved in IGL-1 presented more effective prevention of ATP-breakdown and more inhibition of UPS activity (measured as chymotryptic-like activity). In addition, the prevention of liver proteolysis and UPS activation correlated with the prevention of liver injury (AST/ALT) and mitochondrial damage (revealed by confocal microscopy findings) as well as with the prevention of inflammatory markers (TNF1alpha and HMGB) after reperfusion. In addition, the liver grafts preserved in IGL-1 showed a significant decrease in liver apoptosis, as shown by TUNEL assay and the reduction of cytochrome c, caspase 3 and P62 levels.CONCLUSIONOur comparison of these two preservation solutions suggests that IGL-1 helps to prevent ATP breakdown more effectively than UW and subsequently achieves a higher UPS inhibition and reduced liver proteolysis.

Assessing Drought Vulnerability of Bulgarian Agriculture through Model Simulations

This study assesses vulnerability of agriculture to drought, using WINISAREG model and seasonal SPI2-index for eight climate regions （1951-2004）. Results relative to Plovdiv show that in soils of large TAW （total available water） net irrigation requirements NIRs range from 0 to 380 mm. In soils of small TAW, NIRs reach 440 mm in the very dry year. NIRs in Sofia/Silistra are about 100 mm smaller than in Plovdiv while in Sandanski they are 30-110 mm larger. Rainfed maize is associated with great yield variability （29% 〈 Cv 〈 72%）. Considering an economical RYD （relative yield decrease） threshold, 32% of years are risky when TA Wis large in Plovdiv that is double than in Sofia and half than in Sandanski. In North Bulgaria the risky years are 10% in Pleven/Silistra that is half than in Lom. In Plovdiv region reliable relationships （R2 〉 91%） were found relating the SPI2 ＂July-Aug.＂ with simulated RYD of rainfed maize while remaining relationships were less accurate （73% 〈 R2 〈 86%）. Economical losses are produced when High Peak Season SPI2 〈 ＋ 0.20 in Sandanski, SPI2 〈 - 0.50 in Plovdiv and SPI2 〈 - 0.90 in Sofia. In North Bulgaria the SPI2 threshold ranges from - 0.75 to - 1.50. Derived reliable relationships and SPl-thresholds are used for drought vulnerability mapping.

An Education through Nature That Goes beyond Nature： Wordsworth＇s Prelude of 1799

Wordsworth＇s Prelude of 1799 is presenting a poetic voice of education through nature that goes beyond nature. This essay considers the cycles and developments in the poem under the four themes of Unity; Impression; Time, Age and Season; Revolution.

From the project for a Passion selon Saint Marc to the Realization of the Canticum Sacrum： The Events Surrounding Stravinsky＇s Venetian Commission

The article concerns the commission that was made by the Biennale di Venezia to Stravinsky in the 50s＇ which led to the composition of the Canticum Sacrum. The discovery of the correspondence between the composer, the artistic director Alessandro Piovesan and the organizers of the Venetian Festival allows to reconstruct the events that led Stravinsky to change his initial plans for a Passion selon Saint Marc in favour of a short Canticum. The objections, which concerned above all the limited size of the piece, were repeated several times by Piovesan, but were all disregarded by Stravinsky. In the light of the eight letters deposited in the Archivio Storico delle Arti Contemporanee （ASAC） of Venice （in Appendix）, the circumstances bringing about Stravinsky＇s refusal can be fully understood. The references to recent studies by David H. Smyth, Akane Mori, and Jonathan Kramer regarding the identification of palindromic and proportional structures in the Canticum, offers further proof sustaining Stravinsky＇s declaration that to enlarge the piece would have been impossible. These events confirm the composer＇s unbending determination to undertake a new experimental stylistic direction already tried out in pieces like the Three Songs from William Shakespeare and Agon.

Model of Wetland Carbon Sequestration in the Venetian Lagoon, Italy

This research deals with an evaluation of the sink of greenhouse gas CO2 in a eutrophic area of the Venetian lagoon where fish is farmed （＂Valle da pesca＂）. Following CDM UNFCCC （Clean Development Mechanism United Nations Framework Convention on Climate Change） criteria, this can be considered relevant to the international standard for the voluntary evaluation of carbon credits on the basis of Annex a of Kyoto Protocol. To identify the ＂Valle da pesca＂ brackish lagoon properties regulating the carbon dioxide （CO2）, a survey has been performed during three seasons in one year and in four different locations. These places are located in the Italian Venetian Lagoon and in the Grado Lagoon in North Italy, Europe. To identify the CO2 sink capacity, a special index is calculated. The CO2 concentrations and sink are regulated by the balance of autotrophic and heterotrophic activities, and the sediment anoxic denitrification and macro algae are crucial tank of CO2 in the valley shallow waters. The ponds potential-CO2 yield of 80-124 kg/m2 per year and the value are related and proportional to the correct human environmental control （water flux control）.