Activity Cycle Diagram And The Condition Specification Computer Science Essay

Activity Cycle Diagram And The Condition Specification Computer Science Essay Many descriptive and symbolic techniques for representation of the simulation of a model are present in literature. Some of these techniques are better with one model while not better with the representation of the other one. Two most important techniques for representation of model simulation are known as Activity Cycle Diagram and the Condition specification. The activity cycle diagram (ACD) has been used an ideal technique to represent a model. The technique is based on Tochers idea of stochastic gearwheels (quoted in Paul et al 1993. The ACD represents the activities of a model with its entities by composing their life cycles. The entity could be a passive state as Queue or an active state as activity. The Queue and activity are represented in ACD with specific symbols. Part A Specification of the model domain A part enters a cell where it is first loaded onto machine 1. After this operation the part is either loaded immediately on to machine 2, or if that machine is busy, it is moved to a buffer area. After the operation on machine 2, the part leaves the system. All movements are carried out by a robot. The entities in the system and their possible states. A part Enters into cell Loaded into machine Move to buffer if machine is busy Leaves the machine after operation by machine 2 Machine 1 One in number First in activity No waiting for part to enter in machine 1 Machine 2 One in number Second or Third in activity No waiting or waiting for part to enter in machine 2 A Robot Moves a part from position zero to machine 1 Moves a part from machine 1 to machine 2 or to buffer zone if machine 2 is busy Moves a part from buffer zone to machine 2 when machine 2 is ready. A buffer area Stores a part when machine 2 is busy Dont store a part if machine 2 is ready Move a part from buffer area to machine 2 when machine 2 is ready Classes of Entities Permanent entities stay in system ; Machine 1 Machine 2, Robot Temporary entities that move through the system à ¢Ã¢â€š ¬Ã‚ ¦Part, Buffer zone 1.2 The Activity Cycle Diagram for each of the entities. Part Part Leave Machine 2 Machine 2 Machine 1 Enter into Machine 1 If machine 2 is busy Buffer zone When Machine 2 is ready Figure 1 The Part Part Machine 2 Machine 1 Accepts part Move part to machine 2 If machine 2 is ready Move part to buffer zone if machine 2 is busy Buffer zone Figure 2 Machine 1 Buffer zone Machine 2 Machine 1 Accepts a part from machine 1 Send Part out of When Machine 2 is ready machine 2 Part Final Position If machine 2 is busy Accepts a part from buffer When Machine 2 become ready Figure 3 Machine 2 Machine 2 Part Position zero Machine 1 Moves part Moves part from machine 1 Moves part out of machine 2 From position to machine 2 Part Final Position Zero to machine 1 If machine 2 is busy Moves part from machine 1 to buffer zone When Machine 2 is ready Moves part from buffer zone to machine 2 Buffer zone Figure 4 A Robot Machine 1 Machine 2 Receives part from machine 1 to buffer zone If machine 2 is busy Send part to machine 2 when Machine 2 is ready Buffer zone Figure 5 A buffer area 1.3 The combined Activity Cycle diagram for the whole system and necessary conventions. Robot 1 Robot 2 Part At final position A Part At Position Zero Machine 2 Machine 1 Robot moves a part from Robot moves a part from machine 1 Robot moves a part out from machine 2 Position zero to machine 1 to machine 2 if machine 2 is ready at final position Robot moves a part from machine 1 Robot moves a part from buffer zone To buffer zone if machine 2 is busy to machine 2 when machine 2 become available Buffer zone Figure 6 Part B The elements of the Activity Cycle Diagram that introduce the parts in the cell. Robots are the elements of ACD that introduce parts into machines. It is assumed that there are two Robots. Robot 1 introduce part into machine one and then it has two choices. It moves part from machine 1 to machine 2 if machine 2 is ready to uptake the part. In case the machine 2 is busy, the Robot 1 moves part from machine 1 to buffer zone which is a waiting area. The Robot two is assumed to work with machine 2. It moves part from buffer area into machine 2 when machine 2 becomes available. After processing in machine 2, the Robot 2 moves part from machine 2 to its final position. It should be noted that some assumptions have been made for the responsibilities of two elements (Robots) provided exact tasks have been provided. Four bullet points of the key aspects of proposed diagram. The conditions on which the particular activities in your diagram will be executed. Each activity in ACD is bound with some condition or conditions. For example, in the activity of moving part from machine 1 to machine 2, the attached condition is availability of the machine 2. The Robot 1 will move part from machine 1 to machine 2 provided machines 2 is available to uptake the part. If the condition changes and machine 2 is busy, then Robot 1 will move part to buffer zone. The other significant activity of ACD is related to moving part from buffer zone to machine 2. It is assumed to be done by Robot 2. The Robot 2 has two choices or it will be dealing with two conditions. In condition one when machine 2 is busy, The Robot 2 will not move part from buffer area to machine 2. In condition 2 when machine 2 has become available, then the Robot 2 will move part from buffer zone to machine 2. In the third significant activity, the Robot 2 will move part from machine 2 to its final stage conditional that machine 2 has finished its job on the part. In short, each activity in an ACD is related to one or more conditions. The main attributes of your entities The ACD represents the activities of a model with its entities by composing their life cycles (Abdul et al 1994). The entity could be a passive state as Queue or an active state as activity (Sawhney et al 1995). The Queue and activity are represented in ACD with specific symbols (Shi et al 1997). In the current example, there are also two entities. One is the actual activity or the active state like moving Part from machine one to machine 2 and other entity is the passive entity like buffer zone which can be said as the queue. Similarly we can look at the total entities in ACD. In current example, entities are machine 1, machine 2, Part, buffer area, robot. The physical realization of the queues in the system The physical activity diagram presents an obvious picture to observe the queues in the system (Zeigler 1987). The physical realisation of the queues in the current example comes from the buffer zone which is used as a queue in the example. The part has to wait in buffer area when machine 2 is not free. Therefore the buffer are presents a realisation of the physical queue. The outcome parameters to be studied by the model built upon activity cycle diagram. Each model is designed to study certain parameters in the model (Halpin 1977). The simulation even not used primarily for the optimization of parameters is helpful in optimizing the model in joint effort with design analysis and mathematical evaluation. In the current study, the potential parameters which can be a focus of the study may be studying of queues at buffer zone level, Rate of feed at machine 1, rate of part flow from machine 1 to machine 2 and the removal rate of part from machine 2. All these parameters are of quite significance. For example any significant delay at queue (at buffer zone), decrease at the feed rate at machine 1 or delay at removal rate of part at machine 2 can disrupt the Cell function or decrease its efficiency. The kind of simulation experiments that would be performed with the model. In the real world experimentation can be expensive and in manufacturing and production system, many resources may be used in experimentation (McCahill et al 1993). The alternative to expensive experimentation is simulation methods and other analytical methods (Nance et al 1988). Especially computer model simulations may be economical and provide a chance of actual system observation without incurring unacceptable and expensive options (Murata 1989). On the other hand, physical models may not provide a real picture especially where a layout of resources requires examination such as productivity flow (Vanegas et al 1993). In complex and multistage problems, it may become complex to conduct real and physical experimentation (Paulson 1978). Some actions and activities are not even possible in real world such as a process like flow line optimisation where blocking of a system is required but practically very hard to follow (Paulson et al 1987). However, simulation is not an optimisation p rocedure and must be supported with other procedures like design analysis and optimisation. Therefore we can use experiments like optimisation, design analysis, computerisation simulation, manual simulation, and mathematical model analysis. In current example, objective of model will be kept in mind. First of all small models will be built for each entity. Model will be built in phases and each phase will be checked if it is working properly. The model will be made in phases as it is shown in individual ACD examples. The final ACD will be built once the individual ACD for each entity are checked. Each ACD if planned on computer model or manually will be debugged and corrected. Conclusion ACD are actually the significant evaluation of the flow chart design but with additional features of being used in production and manufacturing field by simulation process. Software is used in designing, analysis and simulation process. Each ACD has entities, attributes attached with entities and conditions associated with each activity. ACD is developed by designing individual ACD for each activity separately and then analysis them for correction. The whole model ACD is developed by merging individual ACD. The current assignment has provided a chance to understand the process of ACD development and analysis by working from individual ACD to the ACD of whole model. References Abdul Riaz, S., Shi, j. 1994. Automated construction simulation optimization. J Construction Eng and Management. ASCE. 120(2), 374-385. Halpin, D.W.1977. Cyclone. A method for modeling job site processes. J Construction Eng and Management. ASCE. 103(3), 489-499 McCahill, D.F., L.E.Bernold.1993. Resource oriented modeling and simulation in Construction. J Construction Eng and Management. ASCE.119 (3), 590-606. Murata, T.1989. Petri nets. Properties, Analysis and implications. Proceeding of IEEE. 77(4).541-580. Nance, r.e, Overstreet .C.M. 1988. Diagnostic assistance using digraph representations of discrete event simulation model specifications. Transactions of the society for computer simulation. 4(1).33-57. Paulson, B.C.1978. Interactive graphics for simulating construction operations. J. Construction. Div. ASCE. 104(1), 69-76. Paulson, B.C., Chan, W.T., Koo, C.C.1987. Construction Operations simulation by microcomputer. J Construction Eng and Management. ASCE.113 (2), 302-314. Sawhney, A., S.M. AbouRiaz.1995. Simulation based planning method for construction project. J Construction Eng and Management. ASCE. 121(3). 297-303. Shi, J., S.AbouRizk.1997. Resource based modeling for construction simulation. J Construction Eng and Management. Vanegas, J.A., E.B.Bravo., D.W.Halpin.1993. Simulation Technologies for planning heavy construction processes. J Construction Eng and Management. ASCE.119 (2).336-354. Zeigler .B.P. 1987. Hierarchical modular discrete event modeling in an object oriented environment. Simulation. 49(5).219-230.

The Return: Midnight Chapter 4

â€Å"First,†Meredith asked, â€Å"is Damon right? If you go back to animal blood, wil you be seriously weakened?† Stefan smiled. â€Å"I'l be the way I was when I first met you,†he said. â€Å"Strong enough to do this.†He bent toward the fire irons right below Damon's elbow, murmuring absently, â€Å"Scusilo per favore† and removed the poker. Damon rol ed his eyes. But when Stefan, in one fluid motion, bent the poker into a shape and then straightened it immediately back and replaced it, Matt could swear that there was ice-cold envy in Damon's usual poker-player expression. â€Å"And that was iron, which is resistant to al eldritch forces,†Meredith said evenly, as Stefan stepped away from the fireplace. â€Å"But of course he's been imbibing from you three charming girls for the past few days – not to mention the nuclear powerhouse that dear Elena has become,†Damon said, clapping his hands three times slowly. â€Å"Oh†¦Mutt. Sono spiacente – I mean, I didn't mean to add you in with the girls. No offense meant.† â€Å"None taken,†Matt said through his teeth. If he could, just once, wipe that flashing, there-and-gone smile off Damon's face, he would die happy, he thought. â€Å"But, the truth is that you have become a very†¦wil ing†¦ donor for Dear Brother, haven't you?†Damon added, his lips twitching slightly, as if only the strictest control kept him from smiling. Matt took two steps toward Damon. It was al he could do not to get right up in Damon's face, even though something in his brain always screamed suicide when he had thoughts like that. â€Å"You're right,†he said as evenly as possible. â€Å"I've been donating blood to Stefan just like the girls. He's my friend, and a couple of days ago he looked like he'd just gotten out of a concentration camp.† â€Å"Of course,†Damon murmured, as if chastened, but then he went on in even softer tones, â€Å"My little brother has always been popular with both – wel , with ladies present, I wil say genders. Even with male kitsune; which of course is why I am in this mess.† Matt literal y saw red as if he were looking through a haze of blood at Damon. â€Å"Speaking of which, what happened to Sage, Damon? He was a vampire. If we could find him, your problem would be over, right?†Meredith asked. It was a good riposte, just as al Meredith's cool responses were. But Damon spoke with his fathomless black eyes fixed on Meredith's face. â€Å"The less you know and say about Sage, the better. I wouldn't speak of him lightly – he has friends in low places. But to answer your question: No, I would not let Sage make me into a vampire. It would just complicate things.† â€Å"Shinichi said good luck on finding out who he is,†Meredith said, stil calm. â€Å"Do you know what he meant by that?† Damon shrugged fluidly. â€Å"What I know is my own business. He spends time in the lowest and darkest of the Dark Dimensions.† Bonnie burst out, â€Å"Why did Sage go? Oh, Damon, did he go because of us? Why did he leave Talon and Saber to watch over us, then? And, oh – oh – oh, Damon, I'm so sorry! So, so sorry! â€Å"She slid off the love seat and bent her head so that only strawberry curls were visible. With her smal pale hands on the floor to brace her, she looked as if she were about to bow her head to the ground at his feet. â€Å"This is al my fault and everyone's angry – but it was just so horrible I had to believe the worst things I could think of!† It was a tension-breaker. Nearly everyone laughed. It was so Bonnie, and so true of al of them. So human. Matt wanted to pick her up and put her back on the love seat. Meredith was always the best medicine for Bonnie. But as Matt found himself reaching for her, he was confounded by two other pairs of hands doing the same thing. One was Meredith's own long, slender olive-skinned hands, and the other pair were male, with even longer tapering fingers. Matt's hand clenched into a fist. Let Meredith take her, he thought, and his clumsy fist – somehow – got in the way of Damon's reaching fingers. Meredith lifted Bonnie easily and sat back on the love seat. Damon lifted his dark eyes to Matt's and Matt saw perfect comprehension there. â€Å"You real y ought to forgive her, Damon,†Meredith, ever the impartial referee, said bluntly. â€Å"I don't think she'l be able to sleep tonight otherwise.† Damon shrugged, cold as an iceberg. â€Å"Maybe†¦someday.† Matt could feel his muscles clench. What kind of bastard said that to little Bonnie? Because of course she was listening. â€Å"Damn you,†Matt said under his breath. â€Å"Excuse me?†Damon's voice was no longer languid and falsely polite, but suddenly a whiplash. â€Å"You heard me,†Matt growled. â€Å"And if you didn't, maybe we'd better go outside so I can say it louder,†he added, soaring on the wings of bravado. He left behind a wail of â€Å"No!†from Bonnie, and a gentle â€Å"Sh,†from Meredith. Stefan said, â€Å"Both of you – â€Å"in a commanding voice, but then he faltered and coughed, which both Matt and Damon took as a chance to sprint for the door. It was stil very warm outside on the boardinghouse porch. â€Å"Is this the kil ing ground?†Damon asked lazily when they had descended the steps and stood beside the gravel path. â€Å"It's fine by me,†Matt said briefly, knowing in his bones that Damon would fight dirty. â€Å"Yes, this is definitely close enough,†Damon said, flashing an unnecessarily bril iant smile in Matt's direction. â€Å"You can yel for help while little brother is in the parlor, and he'l have plenty of time to rescue you. And now we're going to solve the problems of what you're doing in my business and why you are – â€Å" Matt punched him in the nose. He had no idea what Damon was trying to do. If you asked a guy to step outside, then you asked him to step outside. Then you went for the guy. You didn't stand around talking. If you tried that, you'd be stuck with the label of â€Å"coward†or worse. Damon didn't seem like the type who needed to be told that. But then, Damon had always been able to repel any attack on him while he got as many insults as he liked†¦before. Before, he'd have just broken every bone in my hand and gone on baiting me, Matt guessed. But now†¦I'm almost as fast as him, and he simply got taken by surprise. Matt flexed his hand gingerly. It always hurt, of course, but if Meredith could do it to Caroline, then he could do it to†¦ Damon? Damn, did I just take down Damon? Run, Honeycutt, he seemed to hear the voice of his old coach tel ing him. Run. Get out of town. Change your name. Tried that. Didn't work. Never even got a T-shirt, Matt thought sourly. But Damon wasn't leaping up like a flaming demon from hel , with the eyes of a dragon and the strength of a raging bul to annihilate Matt. It looked and sounded more as if he were shocked and indignant from his disheveled hair to his earth-stained boots. â€Å"You†¦ignorant†¦childish†¦Ã¢â‚¬ He lapsed into Italian. â€Å"Look,†Matt said. â€Å"I'm here to fight, okay? And the smartest guy I ever knew said: ‘If you're gonna fight, don't talk. If you're gonna talk, don't fight.'† Damon tried to snarl as he knelt up and pul ed spiny teasel and prickly sida out of his distressed black jeans. But the snarl didn't come out quite right. Maybe it was the new shape of his canines. Maybe it just didn't have enough conviction behind it. Matt had seen enough defeated guys to know that this fight was over. A strange exaltation came over him. He was going to keep al his limbs and organs! It was a precious, precious moment. Al right, then, should I offer him a hand? Matt wondered, to be answered instantaneously by, Sure, if you'd offer a hand to a temporarily stunned crocodile. What do you really need ten whole fingers for, anyway? Oh, wel , he thought, turning to go back into the front door. As long as he lived – which, conceded, might not be too long – he would remember this moment. As he went in, he bumped into Bonnie, who was rushing out. â€Å"Oh, Matt, oh, Matt,†she cried. She was looking wildly around. â€Å"Did you hurt him? Did he hurt you?† Matt smacked his fist into the palm of his hand, once. â€Å"He's stil sitting down back there,†he added helpful y. â€Å"Oh, no!†Bonnie gasped, and she hurried out the door. Okay. Less spectacular of a night. But stil a pretty good one. â€Å"They did what?†Elena asked Stefan. Cold poultices anchored by tight bandages were wrapped around her arm, hand, and thigh – Mrs. Flowers had cut her jeans off short – and Mrs. Flowers was wiping away the dried blood on her neck with herbs. Her heart was pounding with more than pain. Even she hadn't realized that Stefan was tuned in to the entire house when he was awake. Al she could do was to shakily thank God that he'd been asleep while she and Damon – no! She had to stop thinking about it, and right now! â€Å"They went outside to fight,†Stefan said. â€Å"It's idiotic, of course. But it's a matter of honor, too. I can't interfere.† â€Å"Wel , I can – if you're done, Mrs. Flowers.† â€Å"Yes, dear Elena,†Mrs. Flowers said, winding a bandage around Elena's throat. â€Å"Now you shouldn't get tetanus.† Elena stopped in mid-motion. â€Å"I thought you got tetanus from rusty blades,†she said. â€Å"Da – this one looked brand-new.† â€Å"Tetanus comes from dirty blades, my dear,†Mrs. Flowers corrected her. â€Å"But this† – she held up a bottle – â€Å"is Grand mama's own personal recipe that has kept many a wound disease-free down the cen – down the years.† â€Å"Wow,†Elena said. â€Å"I never even heard of Grand mama before. Was she a – healer?† â€Å"Oh, yes,†Mrs. Flowers said earnestly. â€Å"She was actual y accused of being a witch. But at her trial they could prove nothing. Her accusers seemed not even to be capable of coherent speech.† Elena looked at Stefan only to find that he was looking at her. Matt was in danger of being dragged off to a kangaroo court – for al egedly assaulting Caroline Forbes while under the influence of some unknown and terrible drug. Anything to do with courts was interesting to both of them. But looking at Stefan's concerned face, Elena decided not to pursue the subject. She squeezed his hand. â€Å"We have to go now – but let's talk about Grand mama later. I think she sounds fascinating.† â€Å"I just remember her as a crotchety old recluse, who didn't suffer fools gladly and thought just about everyone was a fool,†Mrs. Flowers said. â€Å"I suppose I was going down the same path until you children came and made me sit up and take notice. Thank you.† â€Å"We're the ones who should thank you,†Elena began, hugging the old woman, feeling her heart stop pounding. Stefan was looking at her with open love. It was al going to be al right – for her. I'm worried about Matt, she thought to Stefan, testing the waters more vigorously. Damon's still so fast – and you know he doesn't like Matt a bit. I think, Stefan returned with a wry smile, that that is a rather stunning understatement. But I also think you shouldn't worry until we see who comes back injured. Elena eyed that smile, and thought for a moment about impulsive, athletic Matt. After a moment, she smiled back. She was feeling both guilty and protective – and safe. Stefan always made her feel safe. And right now, she wanted to spoil him. In the front yard, Bonnie was abasing herself. She couldn't help thinking, even now, about how handsome Damon looked, how wild and dark and ferocious and gorgeous. She couldn't help thinking about the times he'd smiled at her, laughed at her, come to save her at her urgent cal . She had honestly thought that someday†¦But now she felt as if her heart were breaking in two. â€Å"I just want to bite my tongue out,†she said. â€Å"I should never have assumed anything from what I saw.† â€Å"How could you possibly have known that I wasn't stealing Elena away from Stefan?†Damon said wearily. â€Å"It's just the kind of thing I'd do.† â€Å"No, it isn't! You did so much to free Stefan from prison – you always faced the most danger yourself – and you kept us al from being hurt. You did al that for other people – â€Å" Suddenly Bonnie's upper arms were being held by hands that were so strong that her mind was flooded with cliches. A grasp of iron. Strong as steel bands. An inescapable grip. And a voice like an icy torrent was coming at her. â€Å"You don't know anything about me, or what I want, or what I do. For al you know I could be plotting right now. So don't ever let me hear you talk again about such things, or imagine that I won't kil you if you get in my way,†Damon said. He got up and left Bonnie sitting there, staring after him. And she'd been wrong. She wasn't out of tears at al .

Verizon Communications Effective And Unacceptable

Abstract This policy covers appropriate use of any ePolicies from a Verizon Communications network and applies to all employees, vendors, and agents operating on behalf of Verizon Communications. The purpose of the ePolicies are to ensure the appropriate use of Verizon Communications systems and make users aware of what Verizon Communications considers as acceptable and unacceptable use in regards to its ePolicies. This policy outlines the minimum requirements for Verizon Communications. 1 Email Policy: 1.1 All use of email must be consistent with Verizon Communications policies and procedures. 1.2 Verizon Communications email account should be utilized primarily for Verizon Communications business related purposes; however, personal communication is permitted on a limited basis, but non Verizon Communications related commercial uses are prohibited. 1.3 All Verizon Communications data contained within an email message or an attachment must be secured IAW data protected email security. 1.4 Email should be retained only if it qualifies as a Verizon Communications business record, are if required by the retention department. 1.5 Email that is identified as a Verizon Communications business record shall be retained according to Verizon Communications Record Retention Schedule. 1.6 The Verizon Communications email system shall not to be utilized for the creation or dissemination of any disruptive or offensive messages, including offensive comments about discrimination.Show MoreRelatedVerizon Communications Inc. : Verizon Communication2015 Words   |  9 PagesVERIZON COMMUNICATION INC. 1 VERIZON COMMUNICATION INC. 2 Verizon Communications Inc., headquarters is in the state of New York; however they were incorporated in Delaware. 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Holidays In The Jewish Religion - Free Essay Example

Sample details Pages: 2 Words: 555 Downloads: 5 Date added: 2019/07/31 Category Religion Essay Level High school Tags: Judaism Essay Did you like this example? In the Jewish religion there are a lot of minor and major holidays that have a special representation of the history of their religion like the celebration of Hanukah, Yom Kipper, and the Passover. In the major Holiday of Hanukah or the festival of lights it is Christmas for the jews and is usually celebrated in and eight day period and celebrated the rededication of the temple of Jerusalem. The king of the Seleucid empire King Antiochus destroyed the temple and killed and captured Jews for practicing their religion. Don’t waste time! Our writers will create an original "Holidays In The Jewish Religion" essay for you Create order He wanted everything to be Hellenistic which means all Greek but a military leader named Judah Maccabee the son of Mattathias led a revolt against the King and defeated the Seleucids in several battles until Judah conquered all of Judea and they were able to capture the temple of Jerusalem but the temple was full of pagan shrines and idols and was dirty and not holy so they cleaned it back to worship and praise their God which was said to be an eight day celebration that is why Hanukah is celebrated 8 days. Later Rabbinic traditions describe the length of the festival from the small amount of oil that burned for eight days straight before going out. This is very different from Christianity view of Christmas as they celebrate it as the birth of Jesus which only last one day. The next major Holiday which is considered to be the most sacred and widely observed holiday is the Passover or pesach in Hebrew. The Passover represents the exodus movement and the Israelites departure from Egypt. The Jews celebrate this weeks long festival with many important rituals. The Passover meal is considered to be very special known as Seder and it is the removal of leavened products from the home and the substitution of Matzo bread and mainly the retelling of the Exodus movement lead by Moses and the reason that those of the Jewish religion remove the leavened bread out of their homes and use the flat bread is because when the Israelites fled Egypt so fast there was no time for their bread to rise or because matzo was easier to carry through the dessert. The last Major Holiday is the called the Yom Kippur or the Day of Atonement and it is considered the most solemn day on the Jewish calendar. This is the day that God seals the book of life and death for the coming year so this day is devoted to repentance of all sins committed over the course of the previous year to clean yourself of all sin. This is also the day to part with all of the hustle of the outside world and focus on your heart and mind to devote yourself with a relationship with God. Jews usually fast on the day of Atonement to show devotion as well as refraining from washing, sexual activity, and wearing of leather because it is considered a luxury item. It is also traditional for them to dress in all white to show a sign of purity and most wear sneakers and athletic shoes. By the time of the Second Temple Yom Kippur important as a day of mourning and abstention and only during the Rabbinic Period as the most important day on the Jewish calendar and is still practiced t oday.