Railway Signalling Using Wireless Sensor Networks

Railway Signalling Using Wireless Sensor Networks Free Online Research Papers Railway Signalling is safety critical domain, where still traditional technology is in use. There are many reasons for using traditional technology; one of the main reasons being the proven Safety performance of the older systems (Relay Based). As the rail traffic is increasing and with higher speed of trains there is an acute need for modernization of Railway Signalling Technology. Even with the advent of Microprocessor based technology, the problems have not been solved. This article proposes the use of Wireless sensor networks in Railway Signaling domain which combines the Ground base signalling and the On–Board Signalling, which is suitable for high Speed Railway Traffic. The article gives brief idea of the architectures of a Sensor Node, Driver node, Gateway Node and Base Station. It discusses the network Architectures and the Routing algorithms to be used in the sensor networks. It also discusses the design of Control laws (Interlocking Logic) for safe movement of trains and also the failsafe techniques to be used in the design of such Technology. It also describes the challenges in using the Concept of Wireless Sensor Networks in Railway Signalling Domain. Research Papers on Railway Signalling Using Wireless Sensor NetworksBionic Assembly System: A New Concept of SelfOpen Architechture a white paperPETSTEL analysis of IndiaThe Project Managment Office SystemEffects of Television Violence on ChildrenComparison: Letter from Birmingham and CritoGenetic EngineeringIncorporating Risk and Uncertainty Factor in CapitalRiordan Manufacturing Production PlanAssess the importance of Nationalism 1815-1850 Europe

The Meaning of Literature - William J. Long

The Meaning of Literature - William J. Long from English Literature: Its History and Its Significance for the Life of the English Speaking World (1909) William J. Long uses the analogy of a boy and man walking along a seashore and finding a shell. Heres what he writes about books, reading, and the meaning of literature... The Shell and the Book A child and a man were one day walking on the seashore when the child found a little shell and held it to his ear. Suddenly he heard sounds,strange, low, melodious sounds, as if the shell were remembering and repeating to itself the murmurs of its ocean home. The childs face filled with wonder as he listened. Here in the little shell, apparently, was a voice from another world, and he listened with delight to its mystery and music. Then came the man, explaining that the child heard nothing strange; that the pearly curves of the shell simply caught a multitude of sounds too faint for human ears, and filled the glimmering hollows with the murmur of innumerable echoes. It was not a new world, but only the unnoticed harmony of the old that had aroused the childs wonder. Some such experience as this awaits us when we begin the study of literature, which has always two aspects, one of simple enjoyment and appreciation, the other of analysis and exact description. Let a little song appeal to the ear, or a noble book to the heart, and for the moment, at least, we discover a new world, a world so different from our own that it seems a place of dreams and magic. To enter and enjoy this new world, to love good books for their own sake, is the chief thing; to analyze and explain them is a less joyous but still an important matter. Behind every book is a man; behind the man is the race; and behind the race are the natural and social environments whose influence is unconsciously reflected. These also we must know, if the book is to speak its whole message. In a word, we have now reached a point where we wish to understand as well as to enjoy literature; and the first step, since exact definition is impossible, is to determine some of its essential qualities. Meaning: The Shell and the BookQualities of LiteratureImportance of LiteratureSummery The first significant thing is the essentially artistic quality of all literature. All art is the expression of life in forms of truth and beauty; or rather, it is the reflection of some truth and beauty which are in the world, but which remain unnoticed until brought to our attention by some sensitive human soul, just as the delicate curves of the shell reflect sounds and harmonies too faint to be otherwise noticed. A hundred men may pass a hayfield and see only the sweaty toil and the windrows of dried grass; but here is one who pauses by a Roumanian meadow, where girls are making hay and singing as they work. He looks deeper, sees truth and beauty where we see only dead grass, and he reflects what he sees in a little poem in which the hay tells its own story: Yesterdays flowers am I,And I have drunk my last sweet draught of dew.Young maidens came and sang me to my death;The moon looks down and sees me in my shroud,The shroud of my last dew.Yesterdays flowers that are yet in meMust needs make way for all to-morrows flowers.The maidens, too, that sang me to my deathMust even so make way for all the maidsThat are to come.And as my soul, so too their soul will beLaden with fragrance of the days gone by.The maidens that to-morrow come this wayWill not remember that I once did bloom,For they will only see the new-born flowers.Yet will my perfume-laden soul bring back,As a sweet memory, to womens heartsTheir days of maidenhood.And then they will be sorry that they cameTo sing me to my death;And all the butterflies will mourn for me.I bear away with meThe sunshines dear remembrance, and the lowSoft murmurs of the spring.My breath is sweet as childrens prattle is;I drank in all the whole earths fruitfulness,To make of it the fragrance of my soulTh at shall outlive my death. One who reads only that first exquisite line, Yesterdays flowers am I, can never again see hay without recalling the beauty that was hidden from his eyes until the poet found it. In the same pleasing, surprising way, all artistic work must be a kind of revelation. Thus architecture is probably the oldest of the arts; yet we still have many builders but few architects, that is, men whose work in wood or stone suggests some hidden truth and beauty to the human senses. So in literature, which is the art that expresses life in words that appeal to our own sense of the beautiful, we have many writers but few artists. In the broadest sense, perhaps, literature means simply the written records of the race, including all its history and sciences, as well as its poems and novels; in the narrower sense literature is the artistic record of life, and most of our writing is excluded from it, just as the mass of our buildings, mere shelters from storm and from cold, are excluded from architecture. A history or a work of science may be and sometimes is literature, but only as we forget the subject-matter and the presentation of facts in the simple beauty of its expression. Suggestive The second quality of literature is its suggestiveness, its appeal to our emotions and imagination rather than to our intellect. It is not so much what it says as what it awakens in us that constitutes its charm. When Milton makes Satan say, Myself am Hell, he does not state any fact, but rather opens up in these three tremendous words a whole world of speculation and imagination. When Faustus in the presence of Helen asks, Was this the face that launched a thousand ships? he does not state a fact or expect an answer. He opens a door through which our imagination enters a new world, a world of music, love, beauty, heroism,the whole splendid world of Greek literature. Such magic is in words. When Shakespeare describes the young Biron as speaking In such apt and gracious wordsThat aged ears play truant at his tales, he has unconsciously given not only an excellent description of himself, but the measure of all literature, which makes us play truant with the present world and run away to live awhile in the pleasant realm of fancy. The province of all art is not to instruct but to delight; and only as literature delights us, causing each reader to build in his own soul that lordly pleasure house of which Tennyson dreamed in his Palace of Art, is it worthy of its name. Permanent The third characteristic of literature, arising directly from the other two, is its permanence. The world does not live by bread alone. Notwithstanding its hurry and bustle and apparent absorption in material things, it does not willingly let any beautiful thing perish. This is even more true of its songs than of its painting and sculpture; though permanence is a quality we should hardly expect in the present deluge of books and magazines pouring day and night and to know him, the man of any age, we must search deeper than his history. History records his deeds, his outward acts largely; but every great act springs from an ideal, and to understand this we must read his literature, where we find his ideals recorded. When we read a history of the Anglo-Saxons, for instance, we learn that they were sea rovers, pirates, explorers, great eaters and drinkers; and we know something of their hovels and habits, and the lands which they harried and plundered. All that is interesting; but it do es not tell us what most we want to know about these old ancestors of ours,not only what they did, but what they thought and felt; how they looked on life and death; what they loved, what they feared, and what they reverenced in God and man. Then we turn from history to the literature which they themselves produced, and instantly we become acquainted. These hardy people were not simply fighters and freebooters; they were men like ourselves; their emotions awaken instant response in the souls of their descendants. At the words of their gleemen we thrill again to their wild love of freedom and the open sea; we grow tender at their love of home, and patriotic at their deathless loyalty to their chief, whom they chose for themselves and hoisted on their shields in symbol of his leadership. Once more we grow respectful in the presence of pure womanhood, or melancholy before the sorrows and problems of life, or humbly confident, looking up to the God whom they dared to call the Allfather. All these and many more intensely real emotions pass through our souls as we read the few shining fragments of verses that the jealous ages have left us. It is so with any age or people. To understand them we must read not simply their history, which records their deeds, but their literature, which records the dreams that made their deeds possible. So Aristotle was profoundly right when he said that poetry is more serious and philosophical than history; and Goethe, when he explained literature as the humanization of the whole world. Meaning: The Shell and the BookQualities of LiteratureImportance of LiteratureSummery So, why is Literature important? How does it show itself as indispensable to a culture? Heres what William Long has to say... Importance of Literature It is a curious and prevalent opinion that literature, like all art, is a mere play of imagination, pleasing enough, like a new novel, but without any serious or practical importance. Nothing could be farther from the truth. Literature preserves the ideals of a people; and idealslove, faith, duty, friendship, freedom, reverenceare the part of human life most worthy of preservation. The Greeks were a marvelous people; yet of all their mighty works we cherish only a few ideals,ideals of beauty in perishable stone, and ideals of truth in imperishable prose and poetry. It was simply the ideals of the Greeks and Hebrews and Romans, preserved in their literature, which made them what they were, and which determined their value to future generations. Our democracy, the boast of all English-speaking nations, is a dream; not the doubtful and sometimes disheartening spectacle presented in our legislative halls, but the lovely and immortal ideal of a free and equal manhood, preserved as a most precious heritage in every great literature from the Greeks to the Anglo-Saxons. All our arts, our sciences, even our inventions are founded squarely upon ideals; for under every invention is still the dream of Beowulf, that man may overcome the forces of nature; and the foundation of all our sciences and discoveries is the immortal dream that men shall be as gods, knowing good and evil. In a word, our whole civilization, our freedom, our progress, our homes, our religion, rest solidly upon ideals for their foundation. Nothing but an ideal ever endures upon earth. It is therefore impossible to overestimate the practical importance of literature, which preserves these ideals from fathers to sons, while men, cities, governments, civilizations, vanish from the face of the earth. It is only when we remember this that we appreciate the action of the devout Mussulman, who picks up and carefully preserves every scrap of paper on which words are written, because the scrap may perchance contain the name of Allah, and the ideal is too enormously important to be neglected or lost. Meaning: The Shell and the BookQualities of LiteratureImportance of LiteratureSummery So, to sum up, William Long explains that Literature is the expression of life... Summary of the Subject We are now ready, if not to define, at least to understand a little more clearly the object of our present study. Literature is the expression of life in words of truth and beauty; it is the written record of mans spirit, of his thoughts, emotions, aspirations; it is the history, and the only history, of the human soul. It is characterized by its artistic, its suggestive, its permanent qualities. Its two tests are its universal interest and its personal style. Its object, aside from the delight it gives us, is to know man, that is, the soul of man rather than his actions; and since it preserves to the race the ideals upon which all our civilization is founded, it is one of the most important and delightful subjects that can occupy the human mind. Meaning: The Shell and the BookQualities of LiteratureImportance of LiteratureSummery