Genetic Algorithm Research Proposal

Genetic Algorithm Research Proposal System Optimization The main concern is to find the optimum value for each design parameter for each prediction period for a total simulation time of 12 hours. The simulation is performed on the selected system based on the optimization timeframe with an acceptable accuracy and the optimization process is applied for a prediction period of one. The value of a single design parameter and internal loads are fixed during a prediction period and may vary from one prediction period to another. Genetic Algorithm Modeling the liquid desiccant system with the CC/DV system is complex task with multi-variables involved, several equations are coupled and indirect relations between different parameters are present. Since several non-linear equations are solved, it is advised to use a revolutionary derivative free optimization tool that follows the direct search technique. The simplest optimization tool that could be used for the proposed case is the genetic algorithm optimization tool because it is derivative free, based on numerical analysis, and is somehow efficient if compared with other derivative based optimization schemes. Moreover, it fetches the global minimum of a specific function. Our choice of using a derivative free algorithm to solve the optimization problem is implemented by the evolutionary genetic algorithm. Genetic algorithms are adaptive methods which may be used to solve search and optimization problems, and are based on the genetic process of biological organisms. Genetic algorithms are growing more and more popular and extending from simple design optimization to online process control. The power of the genetic algorithm arises from its robustness, being acceptably good in finding the near optimum solution and being relatively quick [1]. An efficient optimization technique uses two techniques to find the optimal solution, exploration and exploitation, and this is what genetic algorithm does. The Genetic Algorithm terminology The algorithm starts by seeding a set of trial combinations of the variables to be optimized and calculating the numerical value of the objective function for each combination selected. This set is called the â€Å"Initial Population†. The set of numerical values calculated for the objective function from the first trial, is then evaluated according the â€Å"Fitness Criteria†. The fitness criteria can be defined as the condition for the objective function numerical value to be better convenient than its pears. Based on their fitness, some combinations in the previously seeded set are chosen to be â€Å"Parents†. Parents then undergo either â€Å"Crossover† or â€Å"Mutation† procedure to produce â€Å"Children†. Most fitted parents simply jump to the next generated population without any change; such parents are referred as â€Å"Elite†. The current population is replaced by children from the next population. Elite children are the individuals in the current generation with the best fitness values. These individuals automatically survive to the next generation. Crossover children are created by combining the vectors of a pair of parents. Mutation children are created by introducing random changes, or mutations, to a single parent. The algorithm stops when the â€Å"Tolerance† in the objective function values between two generations is less than a certain set error value, or when the maximum number of â€Å"Generations† is exceeded, or by any other defined â€Å"Stopping Criteria†. For the optimized control strategy used for the chilled ceiling, displacement ventilation system the variables of the chilled ceiling and displacement ventilation are varied; this variation leads to a minimal optimal cost that results in the minimum cost that could be attained in the system. Referring to the system figure and considering the optimal control strategy, the variables that may be used for cost optimization are: The desiccant temperature at the inlet of membrane(). The supply air temperature(). The supply air mass flow rate(). Equation Chapter 6 Section 3Each variable in the optimization routine has a lower and an upper bound. These bounds define the interval where the genetic algorithm searches for the optimal cost and are based on physical considerations. The bounds for the different variables according to ASHRAE’s recommendations are: The supply air temperature is considered to vary between 17 and 23  °C. The supply air mass flow rate is considered to vary between 0.08 and 0.26 kg/s. Optimization Constraints There are several non-linear constraints that are applicable to the system. These constraints are related to thermal comfort issues, condensation inside the room and physical constraints. The constraints may be redefined in the following list The Percent People Dissatisfied inside the occupied zone is less than 10%. This condition is required for the human thermal comfort. The closer the PPD is to zero, it is assumed that the occupants inside the room would be more comfortable noting that the smallest percent people dissatisfaction is 5%. The temperature gradient shall not be greater than 2.5 K/m or 2.5  °C/m. This condition is required so that there would not be any large gradients in the human body. Large gradients cause thermal discomfort for living beings. The stratification height inside the room is greater than 1 m. This condition is required so that the stratified air does not mix with the breathing zone. The relative humidity inside the occupied zone is greater than 56% and less than 76%. The fitness function: To be able to enhance the speed of the genetic algorithm, the electrical cost function and constraints are combined in a single cost function by using penalty functions, thus the fitness cost function may be written as: The coefficients , , , , and in the above function are the weight factors for their related penalty costs. The weight factors values are set according to the system parameter. For the current system,‘s are set to unity. electrical cost The objective function that is to be optimized is the total operational cost of the system; this cost may be divided into: The cost of running the chiller.     Ã‚   The cost of running the pump. The cost of running the fan. Note that in this work the cost is given in units of KW. Chiller Cost The chiller is the main energy consuming component in our system .The chiller cost is expressed in terms of the part load ratio. The part load ratio is defined as the ratio of the current load on the chiller divided by the design load that the chiller could handle. Mathematically, the part load ratio is found from the equation The coefficient of performance of the chiller is correlated to the load equation by using the following correlation: The cost of the chiller is calculated by using the following equation Fan cost The fan cost is directly related to the air mass flow rate by using the following equation: Pump cost The pump cost is related to the pump head, liquid desiccant mass flow rate, and the efficiency of the pump. The power of the pump is evaluated by multiplying the pressure difference by the volumetric flow rate and dividing the result by the pump efficiency; mathematically the pump cost equation may be written as Note that the pump cost is not included in the cost function, since the desiccant mass flow rate is costant. Therefore the total energy consumed can be expressed by the following equation: The Constraints Cost Functions The cost function for the constraints may be written such that they could be incorporated into the online cost function in a simple manner. These constraints are related to their respective threshold values such that when the constraints are violated, the fitness function would have a very large value. For the predicted person dissatisfied, the cost function The relative humidity cost function may be bounded from the upper side by using the relation The stratification height cost is bounded to be larger than 1m, thus the stratification height cost is The temperature gradient is to bounded to be less than 2.5 K/m, thus the temperature gradient cost function may be written as The exponential term helps to penalize the cost function when-ever the thermal comfort level of occupants in the room TH decreases below the minimum set value THmin. This will increase the value of the cost function dramatically and the set of variables at hand is rejected. The integration of the constraint terms within the objective function expression and the use of the exponential form to control the constraints’ cost were implemented by Keblawi et al. [13] and Hammoud et al. [4].

The Rise of Silas Lapham by William Dean Howells Essay -- Papers Willi

The Rise of Silas Lapham by William Dean Howells In the novel, The Rise of Silas Lapham, William Dean Howells makes a particular point about the morals of an individual in the business world. His point is that an individual, such as Silas, must check their morals at the door if they have any plans to make it in the business world. The novel has always been popular, partly because it presents Lapham's financial and social failure as "consciously and deliberately chosen" when he has to decide whether he shall cheat and stay on top in business or tell the truth and fail irrecoverably (Gibson 283). The Rise of Silas Lapham is a novel that deals with the potential moral corruption of a man by money. The outward signs of Silas Lapham's corruption are his attempts to buy his way into social acceptance with a costly house and to buy his way out of moral responsibility through the deliberately unwise loan to a former partner and victim. The loan, made with money that his wife prevented him from spending on the house, is a complication that is neither accidental nor trivial. His eventual "rise" is a moral one resulting from the rejection of a legally sound but purely materialistic standard. It is accompanied by a corresponding adjustment in his understanding of the meaning of social differences, and a return to the "tradition" which had given his own family life solidity and dignity (Bennet 150). By using setting, symbolism and characterization, William Dean Howells writes about the conflicts of an individual and the world of big business, in the 19th century. The setting is a crucial part of the story. The Rise of Silas Lapham is set in the city of Boston, Massachusetts in the late 19th century. If the story where set anyw... ...terature. Ed. Frank N. Magill. Vol. 3. Marshall Cavendice Corporation: New York, 1991. 932-945. Kirk, Clara Manburg. W.D. Howells and Art In His Time. New Brunswick: Rutgers University Press, 1965. Petry, Alice Hall. "William Dean Howells." Critical Survey of Long Fiction. Ed. Frank N. Magill. Vol. 4. Englewood Cliffs: Salem Press, 1983. 1,368-1,379. Pizer, Donald. "The Ethnical Unity of The Rise of Silas Lapham." Critics on William Dean Howells. Ed. Paul A. Eschholz. Coral Garden: University of Miami Press. 80-83. "Portrait Of An American." William Dean Howells: The Development of A Novelist. Ed. George N. Bennet. Norman: University of Oklahoma Press, 1959. 50-51, 80-81, 150-161. Scudder, Horace E. "Recent American Fiction." Critical Essays On William Dean Howells, 1866-1920. Ed. Edwin H. Cady and Norma W. Cady. Boston: G.K. Hall & Co., 1983. 37-57

Christmas Celebration

Christmas Celebration Many people celebrate Christmas but don’t believe in God or Jesus. It’s a holiday that many people will celebrate together by giving each other gifts and spent time with family. The day of Christmas is the birth of Jesus Christ. It is usually celebrated on December 25 each year. Many people around the world will usually celebrate it. It’s a time for family and friends to come together to celebrate a time of joy and love. People also think that on the day of Christmas it should be a day of peace around the world.Little kids will be exited on the day of Christmas because they often get many gifts or present from their friends and family. Many of them will also believe in Santa Claus. On the night before Christmas, kids will prepare a list or a letter to Santa telling him what they wish for. They will also have some cookies and drink on the table for him to eat. Kids have been told that if they are bad and naughty then they will get coal. But i f they are nice then they will get gifts.In their mind Santa Claus is dressed wearing a red coat with white collar, a Santa hat, black boots and leather belt with white bearded. They believe that on that night which is called Christmas Eve, Santa Claus will deliver presents with a sleigh and many reindeer to the well behaved children’s. He will come through the chimney on the roof. Then slide down and walk through the fire place. Then on the morning day of Christmas kids will wake up and presents will be under the Christmas tree. Some kids don’t believe in Santa Clause because they think it’s not real.They might have found out and knows about it. Some kids might be bad and never really got presents. It could also be when they were a kids their family never told them about how Santa Claus exist and how they deliver gifts. They think it is their parents the one who got the present to them and pretend to be Santa. Even though some kids know it’s not true but they still pretend to believe in it. They could be happy from writing the letter to Santa and waking up next morning seeing the presents.It really depends on themselves if they believe it or not. Maybe as they grew older and found out it is their parents then they might be sad and disappointed. I once believed in Santa Claus as a kid because I got present the next day I woke up from every Christmas. But then later on as I grew older I kind of know it was my aunt the one who gave me the presents. I remembered that as a kid before I know the truth it was fun on Christmas Eve because I went to sleep early and the next day I woke up with presents.And once I don’t believe in it then every Christmas there wasn’t gift to me from Santa Claus. I just got gifts from friends and family. This belief can be something going on till today. If each family has children then they can be the one telling them about Santa Claus and make them believe into it. Different culture can celebrat e Christmas in their way but it’s quite the same. With a Christmas tree and giving gifts. Santa Claus is always the same look. Mostly every country in the world will celebrate Christmas.Some of them celebrate early in December and others celebrate early in January. On December 24 the day or night before Christmas which is Christmas Eve is a night where they prepare things. I think Christmas has a beautiful decoration. Mostly if Christmas is celebrated then they would also have a Christmas tree. The Christmas tree will have lights and ornament. The house itself might as well be decorated. Some people will decorate their yards with Christmas figure. And at night it looks nice when it is dark and those Christmas decoration has lights.

A Broad Spectrum Of Eating Disorders - 1066 Words

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Research has found that ED may derive from traumatization, such as self-harm, depression, impulsiveness, posttraumatic stress disorder (PTSD), dissociation, substance use, and somatization. Previous studies consistently demonstrate that impulsive behaviors are more prevalent in ANBP compared with ANR. Drug use, laxative abuse, and other impulsive behaviors have previously been associated with suicidality in BN and ANBP participants. Binge-purging is linked with impulsivity, which is linked with higher rates of suicide; therefore, most people with ED that have this, such as BN or ANBP, might have a greater risk of attemptingShow MoreRelatedChildren With Autism Spectrum Disorder869 Wor ds   |  4 Pagesautism spectrum disorder(ASD) experiences more stress than the typical family without a children with ASD. 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