Monthly Archives: January 2020

My Relationship with my Parents

I truly value my relationship with my parents. The role of my parents and my siblings in my life can hardly ever be overstated. To begin with, I should state that my parents have always provided me with support. Their opinion has always played a significant role in my decision making process. Whenever I had a problematic situation over the course of my life I would necessarily talk to my parents about an issue that generated a seemingly irresolvable dilemma. I could go talk to my father about almost anything. When I was in high school and actually all my way through college my parents used to give my valuable advices as to what kind of men I should choose for relationships, what classes I should take and what cloths I should put on. They always taught me something. I cannot say that I necessarily followed their advice. The ultimate source that I always refer to when I have to make an important decision is my own brain. I believe that I am smart enough as well as experienced enough to make my own decisions. However, it is always important to consult my parents simply because they might give me a different perspective that I would never think of on my own. Even though their opinion might not be exactly what I am looking for at a particular point in my life, their contribution is extremely valuable. It is hard to explain but sometimes when I get in a really complex position and I feel that I know the answer to a question that torments me I go talk to my parents anyway. Most of the time I am totally positive that I will not take their advice and that my own decision will the one that I will take eventually but it is just important for me to have my parents hear my story and contribute to my decision. In other words there are times when I need someone to talk to. My parents and my siblings are the only people that I will select for that role.

My parents and siblings provide a great deal of moral support at times of trouble. However, the role of those people in my life is not confined to comforting me when I cannot find a way out of a complex situation. My relationship with my brother and sister is somewhat different. Of course my brother and sister support me a lot in almost any situation and I am sure that they are the people that I can count on in case I have a dilemma to deal with. However, there has always been tremendous competition among us in the family. It was always vital for me to excel my siblings in almost every aspect of life. Back when I was a high school student I felt like I needed to pick better grades in all the classes that we took together. When it was time for me to pick a university to apply to I always had to know what schools my brother and sister applied to so that I could apply to a better one. That ultimate desire to be the best in the family has always dominated my personality. At this point I cannot say for sure whether it is a good or bad thing. Sometimes I happened to excel in something and that brought me enormous satisfaction. Other times I would sustain a considerable failure and that would just devastate me completely. Nevertheless, now that I can take a look back at my entire life and consciously evaluation everything I ever did I can confidently state that I would not have accomplished most of the things that I have ever done in my life had I not have my siblings. They were the source of my energy and my drive that motivated and inspired me to persevere and keep going even when a situation was bleak and hopeless. My brother and sister are that people that I have to thank for almost everything that I have achieved over the course of my life. I did not realize that when I was younger. Now I can clearly see their role in my life.

Myths About MRSA Infections

MRSA Myth #1: Methicillin Resistant Staph Aureus is a new Problem

This is simply not true. MRSA has been it a problem in the hospital environment for years. Microbial resistance first showed up shortly after the introduction of penicillin into mass use. The medical community has had a problem with resistant bacteria for a long time and it has known about it. Every hospital in the US has an Infection Control Coordinator whose job it is to monitor infection rates in these institutions. The MRSA antibiotic susceptibility rates (along with those of other known super bugs) are monitored with incredible accuracy because the hospital must know when an antibiotic isn’t working. It is important for an hospital to know when their antibiotic formulary choices are no longer effective.

MRSA Myth #2: MRSA Infections are not Deadly

If not identified quickly and treated appropriately, death from MRSA infection is a real possibility. It is important to have culture and susceptibility testing on the wound to be sure the antibiotic regimen is appropriate. This test procedure takes about 48-72 hours. This testing will identify what type of organism is causing the infection and determine the appropriate course of antibiotic treatment. The worst treatment is the antibiotic treatment that will not work. It is a terrible costly waste of precious time and money.

MRSA Myth #3: MRSA is Transmitted by person-to-person contact.

Yes, this is one mechanism of   transmission  from patient to patient, and as it may be the primary means acquiring a MRSA infection, this fact underscores the need for diligent hand washing by anyone in contact with hospital patients. What is not often addressed is that MRSA can also be contracted from equipment used in the hospital and also from the environment.

MRSA Myth #4: MRSA is the only Resistant organism

Not true! Methicillin resistant staph aureus is the organism that has gotten the recent press coverage, but there are a number of other multiply-resistant microorganisms out there. For instance, the organism that causes TB has developed resistance which is well documented. Beyond these, there are a number of other super bugs we should all be concerned about.

MRSA Myth #5: MRSA Infections are limited to Humans

Believe it or not, MRSA can infect animals, too. In addition to person-to-person  transmission , MRSA infections can also be transmitted from person-to-animal. MRSA infections have been found in dogs and cats and other animals. The presence of MRSA in animals is manifested in the same way as human infection. We should be concerned about the health and safety of our pets, too.

Infectious Diarrhea

Clinical Presentation: Every year throughout the world more than 5 million people-most of them kids younger than 1 year-die of acute infectious looseness of the bowels. Although death is really a uncommon outcome of infectious diarrhea within the United States, morbidity is substantial.

It is estimated that you will find more than 200 million episodes each year, resulting in 1.8 million hospitalizations at a price of $6 billion per year. The morbidity and mortality attributable to diarrhea are largely due to loss of intravascular volume and electrolytes, with resultant cardiovascular failure. For example, adults with cholera can excrete a lot more than 1 L of fluid per hour.

Contrast this with the typical volume of fluid lost daily within the stools (150 mL), and it is clear why massive fluid losses connected with infectious diarrhea can lead to dehydration, cardiovascular collapse, and death. Gastrointestinal (GI) tract infections can present with primarily upper tract symptoms (nausea, vomiting, crampy epigastric pain), small intestine symptoms (profuse watery diarrhea), or large intestine signs or symptoms (tenesmus, fecal urgency, bloody looseness of the bowels).

Sources of infection consist of person-to-person   transmission  (fecal-oral spread of Shigella), water-borne  transmission  (Cryptosporidium), food-borne  transmission  (Salmonella or S aureus foods poisoning), and overgrowth following antibiotic administration (Clostridium difficile).

Etiology: A wide range of viruses, bacteria, fungi, and protozoa can infect the GI tract. However, in the majority of instances, symptoms are self-limited, and diagnostic evaluation isn’t performed. Individuals presenting to medical attention are biased toward the subset with more severe signs or symptoms (eg, high fevers or hypotension), immunocompromise (eg, HIV or neutropenia), or prolonged duration (eg, chronic diarrhea defined as lasting 14 days). An exception is large outbreaks of food-borne sickness, in which epidemiologic investigations may detect individuals with milder variants of illness.

Pathogenesis: A comprehensive approach to GI tract infections starts using the classic host-agent-environment interaction model. A quantity of host elements influence GI tract infections. Individuals at extremes of age and with comorbid conditions (eg, HIV infection) are at higher risk for symptomatic infection.

Medications that alter the GI microenvironment or destroy typical bacterial flora (eg, antacids or antibiotics) also predispose individuals to infection. Microbial agents responsible for GI sickness could be categorized according to kind of organism (bacterial, viral, protozoal), propensity to attach to various anatomic sites (stomach, little bowel, colon), and pathogenesis (enterotoxigenic, cytotoxigenic, enteroinvasive).

Environmental elements can be divided into three broad categories based on mode of  transmission : (1) water borne, (2) foods borne, and (three) individual to person. GI tract infections can involve the stomach, leading to nausea and vomiting, or affect the small and large bowel, with looseness of the bowels as the predominant symptom.

The term “gastroenteritis” classically denotes infection of the stomach and proximal little bowel. Organisms causing this disorder consist of Bacillus cereus, S aureus, and a quantity of viruses (rotavirus, norovirus). B cereus and S aureus produce a preformed neurotoxin that, even in the absence of viable bacteria, is capable of causing disease, and these toxins represent major leads to of foods poisoning.

Although the exact mechanisms are poorly understood, it’s thought that neurotoxins act locally, through stimulation of the sympathetic nervous system having a resultant improve in peristaltic activity, and centrally, through activation of emetic centers within the brain. The spectrum of diarrheal infections is typified by the diverse clinical manifestations and mechanisms via which E coli can trigger diarrhea.

Colonization from the human GI tract by E coli is universal, usually occurring within hours following birth. Nevertheless, when the host organism is exposed to pathogenic strains of E coli not normally present in the bowel flora, localized GI illness or even systemic sickness may occur.

You will find five major classes of diarrheogenic E coli: enterotoxigenic (ETEC), enteropathogenic (EPEC), enterohemorrhagic (EHEC), enteroaggregative (EAEC), and enteroinvasive (EIEC). Functions typical to all pathogenic E coli are evasion of host defenses, colonization of intestinal mucosa, and multiplication with host cell injury.

This organism, like all GI pathogens, should survive transit via the acidic gastric environment and be able to persist within the GI tract despite the mechanical force of peristalsis and competition for scarce nutrients from existing bacterial flora. Adherence can be nonspecific (at any part from the intestinal tract) or, a lot more commonly, particular, with attachment occurring at well-defined anatomic areas.

Once colonization and multiplication happen, the stage is set for host injury. Infectious diarrhea is clinically differentiated into secretory, inflammatory, and hemorrhagic kinds, with different pathophysiologic mechanisms accounting for these diverse presentations. Secretory (watery) diarrhea is caused by a quantity of bacteria (eg, Vibrio cholerae, ETEC, EAggEC), viruses (rotavirus, norovirus), and protozoa (Giardia, Cryptosporidium).

These organisms attach superficially to enterocytes in the lumen of the small bowel. Stool examination is notable for the absence of fecal leukocytes, even though in uncommon instances there’s occult blood in the stools. Some of these pathogens elaborate enterotoxins, proteins that improve intestinal cyclic adenosine monophosphate (cAMP) production, primary to net fluid secretion. The classic example is cholera.

The bacterium V cholerae creates cholera toxin, which leads to prolonged activation of epithelial adenylyl cyclase within the small bowel, primary to secretion of massive amounts of fluid and electrolytes into the intestinal lumen. Clinically, the patient presents with copious diarrhea (“rice-water stools”), progressing to dehydration and vascular collapse without having vigorous volume resuscitation.

ETEC, a common trigger of acute diarrheal sickness in young kids and the most typical trigger of looseness of the bowels in travelers returning to the United States from developing countries, creates two enterotoxins. The heat-labile toxin (LT) activates adenylyl cyclase in a manner analogous to cholera toxin, whereas the heat-stable toxin (ST) activates guanylyl cyclase activity.

Inflammatory diarrhea is really a result of bacterial invasion of the mucosal lumen, with resultant cell death. Patients with this syndrome are usually febrile, with complaints of crampy lower abdominal discomfort as nicely as diarrhea, which might contain visible mucous. The term dysentery is utilized when there are substantial numbers of fecal leukocytes and gross blood.

Pathogens connected with inflammatory looseness of the bowels consist of EIEC, Shigella, Salmonella, Campylobacter, and Entamoeba histolytica. Shigella, the prototypical trigger of bacillary dysentery, invades the enterocyte through formation of an endoplasmic vacuole, which is lysed intracellularly. Bacteria then proliferate within the cytoplasm and invade adjacent epithelial cells.

Production of a cytotoxin, the Shiga toxin, leads to local cell destruction and death. EIEC resembles Shigella both clinically and with respect towards the mechanism of invasion of the enterocyte wall; however, the specific cytotoxin associated with EIEC has not yet been identified. Hemorrhagic diarrhea, a variant of inflammatory diarrhea, is primarily triggered by EHEC.

Infection with E coli O157:H7 has been connected with a quantity of deaths from the hemolytic-uremic syndrome, with a number of well-publicized outbreaks related to contaminated foods. EHEC leads to a broad spectrum of clinical disease, with manifestations including (1) asymptomatic infection, (2) watery (nonbloody) looseness of the bowels, (three) hemorrhagic colitis (bloody, noninflammatory diarrhea), and (4) hemolytic-uremic syndrome (an acute illness, primarily of children, characterized by anemia and renal failure). EHEC doesn’t invade enterocytes; nevertheless, it does create two Shiga-like toxins (Stx1 and Stx2) that closely resemble the Shiga toxin in structure and function. After binding of EHEC towards the cell surface receptor, the A subunit of the Shiga toxin catalyzes the destructive cleavage of ribosomal RNA and halts protein synthesis, leading to cell death.

Clinical Manifestations: Clinical manifestations of GI infections vary depending on the on website of involvement For instance, in staphylococcal foods poisoning, symptoms develop several hours after ingestion of foods contaminated with neurotoxin-producing S aureus. The symptoms of staphylococcal food poisoning are profuse vomiting, nausea, and abdominal cramps.

Diarrhea is variably present with agents leading to gastroenteritis. Profuse watery (noninflammatory, nonbloody) diarrhea is connected with bacteria that have infected the small intestine and elaborated an enterotoxin (eg, Clostridium perfringens, V cholerae). In contrast, colitis-like symptoms (lower abdominal pain, tenesmus, fecal urgency) and an inflammatory or bloody diarrhea occur with bacteria that more generally infect the large intestine.

The incubation period is usually longer (> 3 days) for bacteria that localize towards the large intestine, and colonic mucosal invasion can occur, causing fever, bacteremia, and systemic symptoms.

Dog Health Concerns and Common Diseases

Dogs are truly man’s best friend. These loyal, loving, protective and playful creatures have served beside man for thousands of years with an undying and relentless devotion. It’s hard to repay such a service of love, commitment and duty. When put to the basics, we provide our dogs with shelter, healthy nutrition, exercise and friendship. However, a dog’s health and well-being sometimes goes beyond the basics, requiring an owner with an eye for disease risks and proper veterinary care.

If you’re a dog owner, you should make sure your animal sees a qualified veterinarian on a regular basis. The range of diseases, parasites and genetic conditions that dogs can succumb to is vast, so it’s important to keep up your pet’s vaccines, stick to regular check-ups and also know what to look for.

Keep reading to learn about some of the most dangerous and fatal diseases that can afflict your beloved pet along with effective prevention methods.

1. Canine Distemper Virus (CDV)

CDV attacks the respiratory, gastrointestinal and central nervous systems. The disease is contracted through contact with other infected dogs and can be fatal to both young and old dogs. Symptoms include vomiting, diarrhea, fever, shivering, redness around the eyes, loss of appetite, weight loss, seizures, thickened footpads, cough and a discharge from the nose. There is no specific treatment, but sometimes antibiotics can be effective. However, a vaccine exists and should always be administered.

2. Canine Adenovirus or Infectious Canine Hepatitis (ICH)

Infectious Canine Hepatitis (ICH) is an acute liver disease, and highly contagious. The virus is transmitted through bodily fluids like urine, eye or nose secretions. Young and old dogs can be affected by ICH, but puppies are at a higher risk. Symptoms include fever, loss of appetite, vomiting, jaundice and corneal edema, though a blood test is needed to make a final diagnosis. Many dogs recover, but it’s best to prevent ICH through a simple vaccination.

3. Para Influenza or Tracheobronchitis (aka Kennel Cough)

The common name for Tracheobronchitis is Kennel Cough because of its propensity for spreading in close quarters, such as in a boarding kennel. It’s highly contagious and attacks the dog’s upper respiratory system. Like bronchitis in humans, the symptoms are coughing, snorting, hacking and sometimes fever. Kennel Cough can be treated with antibiotics or prevented through vaccination.

4. Rabies

Rabies is not just a dog disease; it will affect all mammals that are not vaccinated against the disease. Rabies directly attacks the brain and the prognosis is often deadly. This common disease can be easily prevented through vaccination. In many states, vaccination for domestic pets is absolutely mandatory.

In short, keep your dog healthy by making sure it gets regular vaccinations. Almost all diseases are preventable.

Is Out-Of-State Real Estate Investing Right for You?

Have you made up your mind to start investing in real estate, but you’re torn in deciding where to invest?

Are you thinking about making a local investment, but wondering if an out-of-state investment might be better?

This is one of the first of many choices you’ll have to make when you decide to invest in real estate: the simple question of where you should invest your hard-earned dollars. While there are definite benefits to investing in your area, there are also some potentially profit-limiting downsides.

That’s not to say investing in outside areas doesn’t have its own pros and cons. Let’s take a look at both and see why out-of-state real estate investing might be a profitable option you have not yet explored.

Investing Locally

This is the most obvious choice for many real estate investors, but is it really right for you?

If you choose to buy a property local to you, you’ll rest easier about your investment since you know the market. First, you know your competition. You might know the names of professionals you can trust and you’ll have an intimate understanding of what the cost of living is for that area and how to make things more affordable.

Second, if you like to be hands-on, it will be much easier for you since you’re right there. If you want to see the property, it’s just a short drive away. If you want to talk to the property manager face-to-face, you just put it on your calendar for the end of the day.

Drawbacks to Local Investments

On the other hand, investing solely local can narrow your options. Not every market has the inventory of good investment opportunities that you can avail yourself of if you invest out-of-state. The local inventory of available properties may or may not be big enough or well-suited for investment opportunities.

You also run into the problem of whether your local market is the one you want. The recession made a huge impact on housing markets throughout the country and some areas have recovered at different paces than others. You might find yourself out-priced in your current market, but even if you aren’t, you might not be able to see a favorable future where you’re at.

Investing Out-of-State

If you decide to invest out-of-state, you can greatly increase your options. You can literally choose any location, any market and invest in properties there. Whether you want to invest in Florida vacation homes and coastal villas or homes in the suburbs of Detroit, the sky’s the limit. You can make your investment fit your price point and interests.

By investing out-of-state, you can put your money to work in markets with high ROI. You pick and choose which markets you’re interested in, and which ones are rising stars in the real estate investment scene, ignoring your own market’s changes.

Investing out-of-state also allows you to scale based on your needs. For many would-be investors, their local market is priced too extravagantly to make real estate investment prudent. The cost of living in a different state, just a few borders east or west, might be considerably lower. That means you can snatch up excellent properties at a much lower cost than you might in your own market.

Even better, you can snag those investment deals on excellent properties that would go for three to four times as much, if not more, in your own local market. Your purchasing power becomes much stronger in other markets, because everything’s relative.

Challenges of Out-of-State Investments

There are still some challenges to these remote investments. First of all, you have to learn who you can trust and maintain the peace of mind that comes from having easy local access to your investment. You also have to be able to trust that the property you’re investing in is what it’s advertised as.

The property is also more difficult to visit if you like to be hands on. You might have to fly out to visit the property, which some people enjoy but others are seriously bothered by. If you are the type of investor who prefers the more passive turn-key approach, this is an excellent opportunity.

Finally, the market won’t be what you’re used to. Nothing will be quite the same as being there and immersing yourself in the market, but you can learn and study. You just have to rely on someone else to have knowledge of the nuances of the market.

Doing Out-of-State Right

There is a solution to all of the challenges of real estate investing outside your state. When you find a reputable, proven company to handle your turn-key real estate transaction, you have someone you can count on to know the market you’re investing in. Here are the main reasons you should find a partner to work with you on your out-of-state investments.

  • They can keep a more educated eye on the market, since they know all of the nuances of that area.
  • They’ll serve as your presence near your investment, keeping everything on track, so you don’t have to make numerous trips to the property.
  • If the turn-key real estate investment firm is reputable, they want you to succeed. This means they’ll do anything they can to make sure you do succeed.

The question becomes, whom can you trust? You want to make sure you engage in a partnership with a firm who is reputable, knowledgeable and engaged in your market. Referrals from other investors are key, so be on the lookout for like-minded people who have been there and done that.

You should also investigate what the turn-key operation offers you, and what their fee or cut of your profit is. Ideally, you’ll want a partner who can help you throughout your investment lifecycle, from acquiring the property to managing it.

Getting Started

We’ve gone over the benefits and drawbacks of out-of-state investing, so now the decision is yours to make. Do you still want to invest locally or have you realized that the time is ripe to diversify your portfolio and invest in out-of-state properties? The benefits of out-of-state real estate investment are huge and the drawbacks can easily be mitigated by partnering with someone in the area in which you’re investing.

Investing – How To Choose The Best Option

Investors are increasingly forced to choose from a proliferation of investment options. They also have to deal with contradictory advice on how to achieve their financial goals and how to invest the savings they have accumulated during their lifetime. If you consider that there are more than 7000 mutual funds available in the United States alone, and thousands of insurance products worldwide, making the choice that will satisfy them ever after is daunting, to say the least.

No wonder people so often ask the rather general question: Which investment is best? The first part of the answer is easy: No single investment is ‘the best’ under all circumstances for all investors. Personal circumstances, goals and different people’s needs differ, as do the characteristics of different investments. Secondly, one asset class’s strength in certain circumstances could be another’s weakness. It is therefore important to compare investments according to relevant criteria. The art is to find the appropriate investment for each objective and need.

The following are the most important criteria:

  • the goal of the investment
  • the risk the investor can handle
  • liquidity required
  • taxability of the investment
  • the period until the financial goal is reached
  • last but not least, the cost of the investment.

THE GOAL

Goals determine the characteristics sought in an investment. You will be in a position to choose the most appropriate investment only when you have decided on your short-, medium- and long-term goals. The following generic goals are normally involved:

Emergency fund

Emergency fund money should be readily available when needed, and the value of the fund should be equal to about six months’ income. Money market funds are excellent for this purpose. While these funds do not perform much higher than inflation, their benefit is that capital is saved and is easily accessible.

If you already have a ready emergency fund covering more than six months’ income, you could consider a more aggressive mutual fund

Capital protection

If your primary aim is capital protection, you will have to be satisfied with a lower growth rate on the investment. Those above 50 are normally advised to be conservative in their investment approach. While this may for the most part be sound advice, you should also keep an eye on the risk of inflation, so that the purchasing power of your money does not depreciate. It is not the nominal value of the capital that should be protected, but the inflation-adjusted one. At an annual inflation rate of 6%, $1 million today will buy the same as $174 110 in 30 years’ time. A 50 year-old with $1 million would therefore have to lower his living standard substantially if he only retains the $1 million until he was 80.

Conservative investments like those listed above should form the normal basis for providing an income. Because of inflation risk, investments should be structured so that they can at least keep up with inflation. This means that at least a percentage of the investment source providing the income should be made up of other asset classes like property and equity mutual funds. The percentage would differ according to individual and economic circumstances.

Investors fortunate enough to have their basic budget provided for by a conservative fund could consider increasing their income with commercial property funds and tax-free income from dividends paid out by listed shares.

Capital growth

If an investor’s primary goal is to achieve capital growth, the real rate of return should be higher than inflation. This implies greater risk to capital in the short term. Investors aiming at capital growth should not be apprehensive, as they will reap the rewards in the long term.

The history of equity prices over the past 100 years proves equity investments to be the best performer, followed by property. This does not mean you should buy either of these investments blindfolded. Wait until the quality shares in which you are interested are trading at inexpensive price levels.

RISK

The investment with a history of the highest growth is not necessarily the one to choose. The Standard Bank’s Gold Fund increased by 178% during the period 13 August 2001 – 24 May 2002 (284 days). Judging only on the growth of the fund during this period, it performed exceptionally well. But would it be the right investment for a retiree? During the 805 days following this, the same fund experienced a negative growth rate of 44%! The problem with an investment that decreases by this percentage is that it will not reach its previous peak by increasing again by 44%. This is because the growth this time will take place from a lower base, so in fact the investment would have to increase by approximately 80%.

LIQUIDITY

Hard assets like Persian carpets, works of art and antique furniture may be good investments in the long term, but unfortunately they are not very liquid. The same is true of certain shares in smaller companies. Money market funds, on the other hand, are very liquid, but the returns may not always be as good as those from other investments. The need to liquidise the investment quickly is therefore also a criterion to consider when evaluating investments.

TAXABILITY

The taxability of an investment has a considerable impact on its value to the investor. When comparing the returns on different investments, the return after tax has been deducted should be used. The investor should always ask what will be left in his pocket after tax deduction.

PERIOD

Conservative investments with no potential for high returns are suitable for shorter periods, while investment-objectives with longer time horizons aspire to achieving higher returns. Money market funds are suitable for periods of one or two years. Income and conservative asset allocation funds for three or four years and flexible asset allocation funds, commercial property funds and value equity funds may be chosen for longer periods, dependent on the economic and interest cycle and the propensity of the investor to accept risk.

COSTS

The costs involved in an investment are normally things like administrative cost and commission. The percentage of the costs to the investment amount directly affects the value of the investment. Many of the currently available investment products are structured in such a way that investors can negotiate commission.

CONCLUSION

No investment strategy blueprint is going to be perfect for everyone’s circumstances. Investment opportunities should therefore be examined critically before any decision is made. It should also be kept in mind that there are different companies managing specific funds under the investment categories referred to above. Some are more effectively managed than others. Investors should therefore research investments as well as the managers thoroughly before investing. Otherwise, they could appoint professional asset managers to do so on their behalf. Time spent determining the type of investment you really need is time invested in your future financial well-being.

IPv4 Vs IPv6 (Advantages and Disadvantages)

We can see the rapid growth of internet users in last few years and this increase also create challenges for internet management groups, stake holders and service providers. Day by day infrastructure of internet is expanding and we can even enjoy the service of internet in villages and remote areas. Increased of usage also increase online devices. In start internet protocol addressing (a specific IP addressing for each online entity) was designed on 32 bit and this scheme IP version called IPv4.IPv4 addressing is like 203.128.076.001. decimal is used to make the IPv4 addresses more palatable for humans and a 32-bit address becomes 4 decimal numbers separated by the period (.) character. If we calculate these decimal values and we can get the total number of devices can be participate on this protocol (256x256x256x256) = allows for 4,294,967,296 addresses. It is about 4 billion of addresses and in early days of internet no one can think, 4 billion slot will be full. here we shall discus some disadvantages of IPv4 as we have seen addressing capability problem and after that we shall go through the solution which will replace IPv4 and addressing structure of the new addressing scheme. we shall go through some disadvantages of IPv4 and new features of IPv6.

Rapid Growth of the Internet and the Exhaustion of the IPv4 Addressing

IPv4 allows for 4,294,967,296 addresses which is about 4 billion and IP allocation limits the public IP addresses to a few hundred million. Cause of this limitation companies using NAT (Network Address Translator) to map single public IP to multiple private IP addresses.

IPv4 Security at IP Level

When we communicate at public medium we need to encrypt data to maintain security and privacy. After a passage of time we have now security for IPv4 packets. This security knows as internet protocol security or IPSec but this is an optional for IPv4.

Internet Backbone Maintaining Large Routing Tables

In IPv4 network IDs allocation is very critical and currently more than 87000 routes in the routing tables of internet backbone routers today. The routing infrastructure is based on flat and hierarchical routing.

Quality of Service Concern in IPv4

Now a days internet users are not only limited with browsing and searching data. Current users are well aware of text and voice and video chat and video conferences and online video libraries. This kind of communication need real time data transfer for quality of service. Normally for these kind of services we use UDP (User Data-gram Protocol) or TCP (Transmission Control Protocol).IPv4 TOS field has limited functionality and, over time, has been redefined and locally interpreted. Additionally, payload identification that uses a TCP or UDP port is not possible when the IPv4 packet payload is encrypted.

IPv6

As we can see we have some basic problems in practice of IPv4 now we will check some new features of IPv6. here I like to describe the some of basic features of IPv6. Deployment of IPv6 is a big challenge for internet management groups, stake holders and service providers. It is difficult but not impossible. We can see benefits of IPv6 here. Biggest upgrade jump from IPv4 32 bit to IPv6 128 bit.

IPv6 Header Format

New header is designed to minimize header overhead. by moving both nonessential and optional fields to extension headers that are placed after the IPv6 header. IPv6 header is more efficiently processed at intermediate routers and that generates efficiency. IPv6 is 4 time larger than IPv4 and its header size is twice than older version.

IPv6 Large Addressing Space

In IPv6 source and destination addresses is based on 128 bit. 128 bit addressing can produce over 3.4 x 1038 possible combinations. Currently we can say this is enough but who know about future may be it also face same problem like IPv4 after some decades. 128 bit addressing allow us multiple levels of sub-netting and address allocation. So we can say that we have plenty of address for use in future.

Addressing and Routing Infrastructure Efficiency in IPv6

IPv6 designed to create an efficient, hierarchical, and summarize able routing infrastructure that is based on the common occurrence of multiple levels of Internet Service Providers. It reduce the size of routing table of backbone routers. Which is can cause of efficient internet experience.

Security features is now built-in

IPv6 has been design to support IPsec (AH and ESP header support required) also support mobility version Mobile IPv6. IPSec based on two types of extension headers and a protocol to negotiate security settings. The Authentication header (AH) provides data integrity, data authentication, and replay protection for the entire IPv6 packet. It is better form developers who built-in security features in development of IPv6 rather we bolt on later.

Quality of Service (QoS) of IPv6

As we have already seen about the UDP and TCP protocols for streaming and other multimedia services on internet. Cause the usage of these services are increasing day by day IPv6 have a flow level field in its header which make better and special handling for packets from source to destination. Data traffic is identified in the IPv6 header, support for QoS can be achieved even when the packet payload is encrypted with IPSec and ESP.

Activity Diagrams – Advantages, Disadvantages and Applications of Use

Activity diagrams describe the actual work flow behavior of a system in Information Technology. These diagrams are very similar to state Diagrams because activities are the actual state of doing something. These diagrams describe the actual state of activities of a system by showing all the sequence of activities performed. Also, these diagrams can show activities that are conditional or parallel.

When to Use: Activity Diagrams

Activity diagrams should be used in alignment with other modeling techniques like interaction diagrams and State diagrams. The main reason behind using these diagrams is to model the work flow behind the system being designed. these Diagrams are also useful for analyzing a use case by describing what actions need to take place and when they should occur, describing a complicated sequential algorithm and modeling applications with parallel processes.

Activity diagrams’ advantages:

  • UML modeling language included that these diagrams are normally easily comprehensible for both analysts and stakeholders.
  • In UML for the IT Business Analyst, “The activity diagram is the one most useful to the IT BA for depicting work flow [because] it is simple to understand-both for BAs and end-users.”
  • Since they are among the most user-friendly diagrams available, they are generally regarded as an essential tool in an analyst’s repertoire.
  • Additionally, as stated above, activity diagrams allow an analyst to display multiple conditions and actors within a work flow through the use of swimlanes. Swimlanes, however, are optional as a single condition or actor is normally displayed without them.

Activity diagrams’ disadvantages:

UML modeling language include that these diagrams have the potential to become overly complex because their user-friendly nature may lend itself to an all-inclusive description. In other words, since it is so simple to display the information related to the project, why not include all of it? When an analyst has a large project, creating a single, overly complex diagram can be a temptation.

However, as one author notes, “if you are using activity diagrams to define the structure of a work flow, you should not attempt to explore several levels of activity graphs down to their most ‘atomic’ level”. Instead, an analyst should try to present a new diagram for each work flow, or if more applicable, to use swimlanes to present different actors within the same work flow.

Another aspect of these diagrams is that they may not be used in lieu of a state diagram or sequence diagram because “activity diagrams do not give detail about how objects behave or how objects collaborate.” This is not a disadvantage per se, but it is important for an analyst to keep in mind when applying diagrams to their work.

In conclusion, activity diagrams are fairly easy to get the hang of, and will be useful for most projects because they plainly and moderately clearly demonstrate how things work.” Unlike many diagramming techniques, these diagrams also enable the depiction of multiple choices and actors within a work flow, and they are easy for even non-technical users to follow

Applications of activity diagram:

This diagram has been extended to specify flows among steps that transmit physical matter (e.g., gasoline) or energy (e.g., torque, pressure).

  • Additional changes allow the diagram to better support continuous behaviors and continuous data flows.
  • The UML 2 specification significantly prolonged the features and scale of activity diagrams beyond their earlier classification as a special case of state diagrams.
  • Today, activity diagrams can be thought of as flow charts for the 21st century, and UML modelers use activity diagrams to describe it.
  • Also, these diagrams are useful in following methods:
  • Business Rules
  • Functions that occur in parallel
  • Complex chain of multiple use cases
  • Software flows and logic control configurations
  • Procedures with judgment points and alternate flows
  • Single use cases