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Dependency Network For Semantic Data
Dependency, dependent or depend may refer to: Computer science * Dependency (computer science) or coupling, a state in which one object uses a function of another object * Data dependency, which describes a dependence relation between statements in a program * Dependence analysis, in compiler theory * Dependency (UML), a relationship between one element in the Unified Modeling Language * Dependency relation, a type of binary relation in mathematics and computer science. * Functional dependency, a relationship between database attributes allowing normalization. * Dependent type, in computer science and logic, a type that depends on a value * Hidden dependency, a relation in which a change in many areas of a program produces unexpected side-effects * Library dependency, a relationship described in and managed by a software dependency manager tool to mitigate dependency hell Economics * Dependant (British English) (Dependent - American English), a person who depends on another as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dependency (computer Science)
In software engineering, coupling is the degree of interdependence between software modules; a measure of how closely connected two routines or modules are; the strength of the relationships between modules. Coupling is usually contrasted with cohesion. Low coupling often correlates with high cohesion, and vice versa. Low coupling is often thought to be a sign of a well-structured computer system and a good design, and when combined with high cohesion, supports the general goals of high readability and maintainability. History The software quality metrics of coupling and cohesion were invented by Larry Constantine in the late 1960s as part of a structured design, based on characteristics of “good” programming practices that reduced maintenance and modification costs. Structured design, including cohesion and coupling, were published in the article ''Stevens, Myers & Constantine'' (1974) and the book ''Yourdon & Constantine'' (1979), and the latter subsequently became sta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tail Dependence
In probability theory, the tail dependence of a pair of random variables is a measure of their comovements in the tails of the distributions. The concept is used in extreme value theory. Random variables that appear to exhibit no correlation can show tail dependence in extreme deviations. For instance, it is a stylized fact of stock returns that they commonly exhibit tail dependence. Definition The lower tail dependence is defined as : \lambda_\ell = \lim_ \operatorname(X_2 \le F_2^(q) \mid X_1 \le F_1^(q)). where F^(q)= \, that is, the inverse of the cumulative probability distribution function for ''q''. The upper tail dependence is defined analogously as : \lambda_u = \lim_ \operatorname(X_2 > F_2^(q) \mid X_1 > F_1^(q)). See also * Correlation In statistics, correlation or dependence is any statistical relationship, whether causal or not, between two random variables or bivariate data. Although in the broadest sense, "correlation" may indicate any type of associ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Benzodiazepine Dependence
Benzodiazepine dependence defines a situation in which one has developed one or more of either tolerance, withdrawal symptoms, drug seeking behaviors, such as continued use despite harmful effects, and maladaptive pattern of substance use, according to the DSM-IV. In the case of benzodiazepine dependence, however, the continued use seems to be associated with the avoidance of unpleasant withdrawal reaction rather than from the pleasurable effects of the drug. Benzodiazepine dependence develops with long-term use, even at low therapeutic doses, without the described dependence behavior. Addiction consists of people misusing or craving the drug, not to relieve withdrawal symptoms, but to experience its euphoric or intoxicating effects. It is necessary to distinguish between addiction to and abuse of benzodiazepines, and physical dependence on them. The increased GABA inhibition on the neural systems caused by benzodiazepines is counteracted by the body's development of tolerance t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barbiturate Dependence
Barbiturate dependence develops with regular use of barbiturates. This in turn may lead to a need for increasing doses of the drug to get the original desired pharmacological or therapeutic effect. Barbiturate use can lead to both addiction and physical dependence, and as such they have a high potential for excess or non-medical use, however, it does not affect all users. Management of barbiturate dependence involves considering the affected person's age, comorbidity and the pharmacological pathways of barbiturates. Psychological addiction to barbiturates can develop quickly. The patients will then have a strong desire to take any barbiturate-like drug. The chronic use of barbiturates leads to moderate degradation of the personality with narrowing of interests, passivity and loss of volition. The somatic signs include hypomimia, problems articulating, weakening of reflexes, and ataxia. The GABAA receptor, one of barbiturates' main sites of action, is thought to play a pivotal r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amphetamine Dependence
Amphetamine dependence refers to a state of psychological dependence on a drug in the amphetamine class. Stimulants such as amphetamines and cocaine do not cause physical dependence. Signs of amphetamine intoxication manifest themselves in euphoria, hypersexuality, tachycardia, diaphoresis, and intensifications of the train of thought, speech, and movement. Over time, neurodegenerative changes become apparent in the form of altered behavior, reduced cognitive functions, and signs of neurological damage, such as a decrease in the levels of dopamine transporters (DAT) and serotonin transporters (SERT) in the brain. Amphetamine use within teenagers can have lasting effects on their brain, in particular the prefrontal cortex. Amphetamine use is rising among students due to the ability to easily access prescribed stimulants like Adderall. Also, in case of chronic use, vegetative disorders soon occur such as bouts of sweating, trouble sleeping, tremor, ataxia and diarrhea; the degradation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alcohol Dependence
Alcohol dependence is a previous (DSM-IV and ICD-10) psychiatric diagnosis in which an individual is physically or psychologically dependent upon alcohol (also chemically known as ethanol). In 2013, it was reclassified as alcohol use disorder in DSM-5, which combined alcohol dependence and alcohol abuse into this diagnosis. Definition Diagnosis DSM: Alcohol dependence According to the DSM-IV criteria for alcohol dependence, at least three out of seven of the following criteria must be manifest during a 12-month period: * Tolerance * Withdrawal symptoms or clinically defined alcohol withdrawal syndrome * Use in larger amounts or for longer periods than intended * Persistent desire or unsuccessful efforts to cut down on alcohol use * Time is spent obtaining alcohol or recovering from effects * Social, occupational and recreational pursuits are given up or reduced because of alcohol use * Use is continued despite knowledge of alcohol-related harm (physical or psycholo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Psychological Dependence
Psychological dependence is a cognitive disorder that involves emotional–motivational withdrawal symptoms—e.g. anxiety and anhedonia—upon cessation of prolonged drug abuse or certain repetitive behaviors. It develops through frequent exposure to a psychoactive substance or behavior, though behavioral dependence is less talked about. The specific mechanism involves a neuronal counter-adaption, which could be mediated through changes in neurotransmittor activity or altered receptor expression. Environmental enrichment and physical activity can attenuate withdrawal symptoms. Psychological dependence is not to be confused with physical dependence, which induces physical withdrawal symptoms upon discontinuation of use. However, they are not mutually exclusive. Symptoms Symptoms of psychological dependence include: *Anxiety *Panic attack *Dysphoria *Anhedonia * Craving *Stress Development Psychological dependence is caused by consistent and frequent exposure to a drug or b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physical Dependence
Physical dependence is a physical condition caused by chronic use of a tolerance-forming drug, in which abrupt or gradual drug withdrawal causes unpleasant physical symptoms. Physical dependence can develop from low-dose therapeutic use of certain medications such as benzodiazepines, opioids, antiepileptics and antidepressants, as well as the recreational misuse of drugs such as alcohol, opioids and benzodiazepines. The higher the dose used, the greater the duration of use, and the earlier age use began are predictive of worsened physical dependence and thus more severe withdrawal syndromes. Acute withdrawal syndromes can last days, weeks or months. Protracted withdrawal syndrome, also known as post-acute-withdrawal syndrome or "PAWS", is a low-grade continuation of some of the symptoms of acute withdrawal, typically in a remitting-relapsing pattern, often resulting in relapse and prolonged disability of a degree to preclude the possibility of lawful employment. Protracted withdra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Substance Dependence
Substance dependence, also known as drug dependence, is a biopsychological situation whereby an individual's functionality is dependent on the necessitated re-consumption of a psychoactive substance because of an adaptive state that has developed within the individual from psychoactive substance consumption that results in the experience of withdrawal and that necessitates the re-consumption of the drug. A ''drug addiction'', a distinct concept from substance dependence, is defined as compulsive, out-of-control drug use, despite negative consequences. An ''addictive drug'' is a drug which is both rewarding and reinforcing. ΔFosB, a gene transcription factor, is now known to be a critical component and common factor in the development of virtually all forms of behavioral and drug addictions, but not dependence. The International Classification of Diseases classifies substance dependence as a mental and behavioural disorder. Within the framework of the 4th edition of the ''Diagn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dependent Personality Disorder
Dependent personality disorder (DPD) is characterized by a pervasive psychological dependence on other people. This personality disorder is a long-term condition in which people depend on others to meet their emotional and physical needs, with only a minority achieving normal levels of independence. Dependent personality disorder is a cluster C personality disorder, which is characterized by excessive fear and anxiety. It begins prior to early adulthood, and it is present in a variety of contexts and is associated with inadequate functioning. Symptoms can include anything from extreme passivity, devastation or helplessness when relationships end, avoidance of responsibilities and severe submission. Signs and symptoms People who have dependent personality disorder are overdependent on other people when it comes to making decisions. They cannot make a decision on their own as they need constant approval from other people. Consequently, individuals diagnosed with DPD tend to place n ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dependency Need
Dependency need is "the vital, originally infantile needs for mothering, love, affection, shelter, protection, security, food, and warmth." (Segen, 1992) A dependency need is thought to be characterized by two components: (1) It is a real need of an organism, something that must be present in order for the organism to be able to thrive, (2) It is something that an individual cannot provide for him or herself. It is well known that infants have many dependency needs; some of these needs are obvious, others have only come to the attention of researchers as the result of epidemiological studies. The more obvious needs of infants include: adequate feeding, adequate watering, adequate cleaning, adequate shelter, and more specifically, keeping the infant's body temperature within the narrow range of normalcy. On the other hand, it was not well known until the middle of the 20th century that infants also required the presence of warmth and affection, known as "maternal warmth". The grea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Codependence
In sociology, codependency is a theory that attempts to explain imbalanced relationships where one person enables another person's self-destructive behavior such as addiction, poor mental health, immaturity, irresponsibility, or under-achievement. Definitions of codependency vary, but typically include high self-sacrifice, a focus on others' needs, suppression of one's own emotions, and attempts to control or fix other people's problems. People who self-identify as codependent exhibit low self-esteem, but it is unclear whether this is a cause or an effect of characteristics associated with codependency. Codependency is not limited to married, partnered, or romantic relationships, as co-workers, friends, and family members can be codependent as well. History The term “codependency” most likely developed in Minnesota in the late 1970s from “co-alcoholic”, when alcoholism and other drug dependencies were grouped together as “chemical dependency.” The term is most of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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