MTU值與網路效率的關係
中文摘要:\r 本研究旨在探討,在TCP/IP 協定之下,最大網路傳輸效率之MTU\r (Maximum Transmission Unit,最大傳輸單位)值。根據IEEE 所公\r 佈Ethernet 之標準,經實地模擬實驗,本研究之結論如下:(1)在\r 單純兩台電腦直接串接時,由於幾乎無任何干擾與封包的碰撞,可設\r 定之MTU 最大值以1500bytes 為最佳;(2)但在模擬真實的大型廣域\r 網路時,由於碰撞增加及雜訊增多,經模擬實驗顯示,MTU 值為\r 1500bytes 時無法在資料傳送、接收及重組時取得平衡,最佳之MTU\r 值落於500 到600bytes 之間,進一步研究顯示MTU 值設在500 到\r 600bytes 時可提升傳輸效率約50%。同時,本研究亦討論將此機制應\r 用於未來新網路標準之可行性及其必要性。Abstract:\r The main purpose of this research is to explore the best network\r transmission efficiency's Maximum Transmission Unit under TCP/IP\r protocol. According to the Ethernet's standard of IEEE and simulated\r experiments, the outcome of this research are :( 1) When connecting two\r computers serially, there is almost no interference and impact of packets,\r the best MTU that we can set up is 1500bytes ;( 2)When simulating the\r truly wide area network, interference and impact are rising. The result of\r this simulates experiment shows that when MTU is at 1500bytes, it's\r unable to keep balance when sending, receiving and re-composing. The\r best new MTU is between 500bytes and 600bytes. And when MTU is\r between 500bytes and 600bytes, the network transmission efficiency can\r be promoted about 50% higher. At the same time, the research is also\r discussing the feasibility and necessity of applying it to the standard of\r the future network.
氣候變遷對台灣地區異常降水的影響
Drought and inundation are two unusual natural disasters in Taiwan. The two natural disasters\r have some relation of abnormal rainfall become more and more in Taiwan. So it let me think about\r can climate vicissitudes make the chance of abnormal rainfall become more?\r The study have researched the chance of abnormal rainfall by "rainfall duration" and "total\r rainfall". It collect the day by day total rainfall from 1960 to July 2002, collect locals are Taipei,\r Taichung, Kaohsiung and Hualien. Than enter the data into the computer, let computer calculation\r total rainfall, rainfall days, heavy rain days, pouring rain days and torrential rain days. Then\r analysis the tendency of long-term change.\r According to the analysis, the chance of abnormal rainfall happened become more in Taipei,\r Taichung, Kaohsiung and Hualien. The ratio of Hualien and Kaohsiung is the most obviously. It's\r also find that there temperature and total evaporate became higher, the total sunshine duration\r became lower. Then El Nino have some influence in abnormal rainfal. In El Nino year, total rainfall\r will become lower. When La Nina year, the total rainfall will become more in Taipei and Hualien.\r Then the long influence is clearly in Taipei.\r 乾旱與水災是台灣地區相當常見的二項天災,這二項災害的發生都與異常降水有直接的\r 關係。近年來台灣地區因異常降水造成的天然災害,似乎有逐年增加的趨勢。因此讓人聯想\r 到氣候變遷是否會導致異常降水頻率增加。\r 本研究主要由「降雨時數」與「降雨量」二方面探討異常降水發生頻率。先收集台北、\r 台中、高雄、花蓮四地自1960 年至2002 年七月三十一日之逐日雨量資料,將資料輸入電腦\r 後,統計各站歷年降雨量、降雨日數、大雨、豪雨、暴雨日數,並分析長期變化趨勢。\r 分析結果,台北、台中、高雄、花蓮四地異常降水發生機率,有增加的情形;其中以花\r 蓮及高雄變化的比例最高。再與其他各地氣象要素比較可發現,可能與氣溫及蒸發量數上升,\r 以及日照時數縮短有關。另外聖嬰現象也可能對異常降水有長期性的影響。一般而言聖嬰年\r 雨量減少,反聖嬰年台北、花蓮地區雨量反而會增加。而長期性的影響,以台北地區最顯著。
本土藥材金銀花的研究與分析
本實驗以薄膜色層層析(TLC)、高效能液相層析(HPLC)分析等化學方法,進行金銀花品種差異的鑑識;此外,配合生藥學的顯微鏡檢視,如中藥材組織鏡檢、藥材粉末鏡檢等比對,以期找出辨別金銀花品種的方法。研究至目前為止,由金銀花之薄膜色層分析的Rf值(0.225、0.425、0.7、0.85、0.95)可確認出金銀花藥材,並得知金銀花藥材中皆含有綠原酸的成分;以高效能液相層析的圖譜與成分峰的積分面積可用來判別金銀花的品種,並從質譜分析瞭解成分含量;進行生藥學的藥材粉末組織鏡檢,發現無法作為金銀花藥材的分類憑藉。未來將持續延伸實驗,朝向中藥奈米化與一般粉末在藥效、成分上差異的比較,並進行金銀花萃取液的抗菌作用試驗,瞭解不同品種之金銀花藥材在藥理作用的異同,接續著奈米化藥材的應用與實踐。Using thin layer chromatograph (TLC) and high performance liquid chromatography (HPLC), we can study how to differentiate the species variation of honeysuckle; beside, based on the observation of biopharmaceutical microscope, such as comparing the histology of Chinese herbs and its powder, we suggest that we could differentiate the species of honeysuckle. From the present, firstly, we could distinguish the honeysuckle from other herbs by the Rf value of TLC(0.225, 0.425, 0.7, 0.85, 0.95), from which we find that all honeysuckles contain the component of Chlorogenic acid. Secondly, we could tell the species of honeysuckle according to the map of HPLC and the peak area after integration, as well as the integrants of honeysuckle by way of LC-Mass analysis. Thirdly, while studying the histological analysis based on the observation of biopharmaceutical microscope, we found that it shows no difference between all the honeysuckles; thus, it fails to be a scientific method used to distinguish the herb honeysuckle. However, in the biochemical experiments of honeysuckles, we found honeysuckles from different sources and the place of origin shows difference in their antibiotic effect, showing the importance of local medicine. When it comes to my future work, in order to extend my experiments on honeysuckles, I would compare the nano-scale honeysuckle powder with normal-sized one in their clinical effects and components.
別鬧了,辛普森先生
We investigate the machinery producing successive Simpson’s paradoxical reverse. Taking advantage of algebraic and geometric techniques, we obtain the following results. Take playing baseball for example. In our study, we find that Simpson’s paradox only occurs when the hitter’s hits over 3 times in one game. Set n equal to the times I will hit in one game. If my batting average in each game is at least(n ?1)/2 times higher than the others’; then I am sure that my total batting average would not be invert by the others. In order to find how many the lattice points in the triangle, we use Pick’s formula. But sometimes, the Pick’s formula is not appropriate to triangles whose vertex are not all lattice points. So we develop New Pick’s formula to estimate the number of lattice points in such kind of triangles. Besides, we also find an iterative algorithm to produce successive “Simpson reverse” phenomenon by using C++ language, and we can therefore produce as many “Simpson’s set of four sequences” terms as we like(not beyond the computers’ upper limit).Moreover, if both sequences of ratios converge, then they must have the same limit.我們探討了一般人乍看之下顯得頗弔詭的辛普森詭論。我們配合GSP 作圖,用解析幾何、設立直角座標系和C++ 程式的運算,找出在特殊情況下或一般情況下所產生的辛普森數列組和特殊的性質,並且以棒球場上的打擊率為例子來做印證。通常一場棒球賽中,每個人平均上場3 次~4 次,經過我們的討論,發現要發生逆轉的機會只有在上場達到4 次或以上時才會發生。?了求出在直角座標系中可以滿足的格子點個數,我們用了Pick公式,但?了更準確的估計,我們引進了虛點的概念,重新推導出了新Pick 公式。另外,我們還發現,假設兩個人上場比賽,若打了2 場,且每場最多上場打擊K 次,其中的一個人的打擊率只要是另一個人的(k-1)/2倍以上就保證不會被逆轉。我們又找到了連續產生辛普森逆轉的演算法,利用C++ 寫出程式,經由演算法和遞迴式,製造出項數可任意多(只要電腦能夠承受)的辛普森數列組,且我們發現若兩個比值數列接收斂,則極限趨近於同一個數值。
由Brocard Point 發現幾何不等式
本研究報告以Brocard Point 為核心,所用到的性質均先證明,以確認其正確性,並推演出一些其他的性質,藉由這些性質導出幾何不等式。內容可概分為四部份:(1)以Brocard Angle 及已知的或推演出的基本性質,導出一些不等式。(2)結合「法格乃諾問題」、「費馬點」、「尤拉公式」導出幾個幾何不等式。尤其是三角形邊長與面積,外接、內切圓半徑與邊長間的不等關係,頗為有趣。(3)以向量為工具,分別計算內、重、垂心與Brocard Point 間的距離,並導出邊長的不等關係。其中由內心及重心所導出的不等式,清楚俐落;垂心所導出的不等式則較為複雜。(4)以Brocard Cirle 與內、重心間的關係,導出一系列的不等式。其中Weitgenberk 不等式的無意發現,令我們印象深刻。The Discovery of Geometry Inequalities by Brocard Point This paper takes Brocard Point as a core. We proved some properties about Brocard geometry to confirm its accuracy, and deduce some other properties, and then derive some geometry inequalities by these properties. The content may divide into four parts: a) Derives geometry inequality by Brocard Angle, Crux Mathematicorum and properties which known or deduced. b) Unifies "Fagnano problem", "Fermat Point", "Euler formula" to derive several geometry inequalities. In particular the inequalities between triangle area and length of side, or circumradius inradius and the length of side, is quite interesting. c) Derives geometry inequalities about length of sides in triangle by the distances between incenter centroid circumcenter and Brocard Point. Especially, these inequalities were elegant which derived by incenter and centroid, but it was complicated derived by orthocenter. d) According to the relation about incenter centroid and Brocard Circle derives a series of inequalities. Discover Weitgenberk inequality makes us excited.
直角三角形生成關係的研究與發展
k(2αβ ,α2 ? β2,α2 + β2 )是大家熟悉畢氏定理的通式解,且一般書籍的証明大都採用代數的手法證明。以國中生而言,上述的代數方對國中生來說不夠直接且較無推展的實用性。因此幾何觀點出發發展另一種思考方式,利用角平線的性質給予畢氏定理比例解另一種全新的詮釋,並賦予比例解中的參數α 、β 在幾何的意義。在推理的過程中,我們得到一個相當有用的對應關係:一個有理數對應到一個直角三角形、兩個有理數對應到海倫三角形,再將此對應關係運用到各種幾何圖形上面,即可證明出他們所對應的通式解。最後我的興趣鎖定在海倫三角形、完美海倫多邊形與超完美海倫多邊形上的做圖方法上,善用我們所發展的對應關係,上述的問題皆可迎刃而解。k(2αβ ,α2 ? β2,α2 + β2 ) is a popular formula in Pythagoras Theory, often proved in algebra approach among books. Nevertheless, in light of junior high students, the aforementioned algebra method is neither direct nor practical. Hence, a different thinking method is derived from geometry perspective, using the straight line concept to reinterpret Pythagoras Theory and define the geometric meanings of α andβ . In the process of logical development, a useful correlation emerges: a rational number correlates with a straight-angled triangle, and two rational numbers correlate with Heron Triangle. This correlation can be applied to all kinds of geometrical diagrams to prove the correlated homogenous solution. Ultimately, my interest lies in the diagram methods of Heron Triangle, Perfect Heron Polygon, and Super Perfect Heron Polygon in order to apply our developed correlations to solve the above mentioned problems.
形?與形外
在這篇研究報告中,我用了三種觀點來推廣幾何中的反演變換,首先,把反演變換視為是一種圓內與圓外的一種1-1且onto的映射,第一種推廣,是將變換中心移到視圓心以外的圓內的地方,馬上我們得到一個結論「反演半徑會隨著動點而改變」,接著,我們實驗了一下反演變換用有的一些性質,保角性,保圓性,…等在這個變換視中是否依然存在;接著我們用第二種方法來推廣反演變換,我們將邊界的形狀由圓視改成別的形狀(如三角形,四邊形…等等),然後也試試看在這種變換之下是否還擁視有反演變換的一些性質;第三種推廣,則是在研究的過程中,我發現了一種新的幾視變換,承接第一種推廣,我們將原先為定點的變換中心改為動點,將原先的動點改為定點,做出來的一種新變換。In the study, a new geometric Inversive transformation through three points is discovered. Here is the main result:(1)The first, onto cycle of inside and outside can be proved under invasive transformation. It is changed moving the center from center of cycle, we can get a new ” Inversive radius can be changed by moving drop. (2) We hope to find the answer to this problem by experiment, it is exist with the inversive properties. (3) A new geometric transformation is discovered, a fixed drop can be changed moving drop, then the first moving drop shifted the fixed drop. This leads to a new construction if the new transformation.
應用垂直循環層流淨化水質之研究
The results of the thermal diffusion experimental show that the separation efficient\r increases with increasing ΔT, but decreases with increasing Q at C0 constant. When\r Q is kept constant, the efficient of change ΔT are small, and the maximum at C0 about\r 545 mg/L. The purification efficient of raw water for thermal diffusion is low.\r And it is high energy consumption, difficult operation, and high costs. So the potential\r of the application is low. Therefore, the vertical circulatory laminar flow apparatus\r was developed in this study. And the separation equation of this apparatus was also\r set up. The results of vertical circulatory laminar flow experimental show that\r the efficient increase with increasing V, and the optimum conditions are at about\r Q= 1.05 L/min, C0=800±50 mg/L, and V=26 cm/min. The separation efficient of the\r vertical circulatory laminar flow apparatus is higher than thermal diffusion apparatus.\r And its energy consumption and costs are low, and easy to operate. Since all interior\r moveable plates have two operation sides, so the multiple channel apparatus is application.\r Therefore, the multiple channel apparatus can treat large amount raw water and has\r low costs. The efficient of the experimental all are better than the theoretical\r values that may due to: (1)the assumed partical diameter is too small,(2)the flow\r is not real laminar flow, and (3)the end-side effect is not considerate.
\r 熱擴散實驗結果顯示在固定C0下,分離成效隨ΔT增加而增高,但隨進料流率增加而降低。在固定ΔT下,分離效率亦隨進料流率增加而降低。固定進料流率下,增加ΔT對分離效果的影響不大,以C0=545±10\r mg/L時,顯現出最佳成效。採用熱擴散裝置雖對降低原水中之懸浮微粒含量效果有限,且能源需求高,造成高成本和操作複雜,不具實用潛力。為提高分離原水微粒之成率,以及簡化操作與降低成本,本研究開發垂直旋轉帶裝置來製造出上下循環水流,並導出水流與微粒於其中之流速分布式,以及頂部、底部出口之微粒濃度計算式。垂直循環轉帶實驗結果,顯示提高V值有助於降低Ct/Cb比值;Q=\r 1.05 L/min左右、C0=800±50 mg/L下與V在26 cm/min左右,均有較低之Ct/Cb比值。垂直旋轉帶裝置分離成效明顯優於熱擴散裝置,且設備簡單、能源需求低與操作容易。由於旋轉帶之兩面均可以做為移動平板,因此不僅可以用來處理大量之高濁度原水,也能更具經濟效益。由理論與實驗結果之比較,顯示理論成效較實驗差,探討其原因可能是:(1)平均粒徑之假設值偏低、(2)流場並非全然以層流流動、(3)兩端終端效應未加考慮等。