What Does Stm Mean?

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What Does Stm Mean

What does SMT slang mean?

‘SMT’ often means ‘ sucking my teeth ‘ in texting to show disapproval or annoyance. On Instagram, ‘smt’ is most commonly used to say, ‘Send me this’ when sharing a post. TikTok users put ‘smt’ in captions and comments to shorten the word ‘something.’

What does STM mean short-term?

Also known as short-term memory (STM), is a temporary storage of a limited amount of information in an active and quickly accessible state so that it can be manipulated or acted upon.

What does STM mean in business?

Speed to market (STM) is a business term that refers to the speed at which a company can establish its presence in the market with new products and services.

What does STM mean in technology?

A technique for multiplexing several circuits over transmission links and switches whereby time is divided into slots or buckets, and circuits are given time units whether or not they have any data to transmit.

What does SMT mean on Snapchat?

Second Definition For SMT – “Sucking My Teeth” is a common definition for SMT on Snapchat, WhatsApp, Facebook, Twitter, Instagram, and TikTok.

SMT
Definition: Sucking My Teeth
Type: Abbreviation
Guessability: 2: Quite easy to guess
Typical Users: Adults and Teenagers

What is smt in gender?

Shrimati is a term used in several Indian languages, traditionally as a title for a married, adult woman. It is akin to the English ‘Mrs.’ The abbreviation is ‘Smt.’ This honorific is usually placed right before the name of the respected woman. Unmarried women bear the title kum or kumari.

Who is the full form of STM?

STM stands for ‘ Phonological Short-term Memory ‘ that refers to the ability to keep spoken material temporarily in short term memory.

What does STM mean in memory?

Introduction – Short-term memory (STM), also referred to as short-term storage, or primary or active memory indicates different systems of memory involved in the retention of pieces of information (memory chunks) for a relatively short time (usually up to 30 seconds).

In contrast, long-term memory (LTM) may hold an indefinite amount of information. The difference between the two memories, however, is not just in the ‘time’ variable but is above all functional. Nevertheless, the two systems are closely related. Practically, STM works as a kind of “scratchpad” for temporary recall of a limited number of data (in the verbal domain, roughly the George Miller’s ‘magical’ number 7 +/- 2 items) that come from the sensory register and are ready to be processed through attention and recognition.

On the other side, information collected in the LTM storage consist of memories for the performance of actions or skills (i.e., procedural memories, “knowing how”) and memories of facts, rules, concepts, and events (i.e., declarative memories, “knowing that”).

  • Declarative memory includes semantic and episodic memory.
  • The former concerns broad knowledge of facts, rules, concepts, and propositions (‘general knowledge’), the latter is related to personal and experienced events and the contexts in which they occurred (‘personal recollection’).
  • Although STM is closely related to the concept of ‘working memory’ (WM), STM and WM represent two distinct entities.

STM, indeed, is a set of storage systems whereas WM indicates the cognitive operations and executive functions associated with the organization and manipulation of stored information. Nevertheless, one hears the terms STM and WM often used interchangeably.

Furthermore, one must distinguish STM from the ‘sensory memory’ (SM) such as the acoustical echoic and iconic visual memories which are shorter in duration (fraction of a second) than STM and reflect the original sensation, or perception, of the stimulus. In other words, SM is specific to the stimulus’ modality of presentation.

This ‘raw’ sensory information undergoes processing, and when it becomes STM gets expressed in a format different from that perceived initially. The famous Atkinson and Shiffrin model (or multi-store model), proposed in the late 1960s, explains the functional correlations between STM, LTM, SM, and WM.

Later on, a considerable number of studies demonstrated the anatomical and functional distinction between memory processes as well as neural correlates and functioning of STM and LTM subsystems. In light of these findings, several memory models have been postulated. While certain authors suggested the existence of a single memory system encompassing both short- and long-term storage, after 50 years the Atkinson and Shiffrin model remains a valid approach for an explanation of the memory dynamics.

In light of more recent research, however, the model has several problems mostly concerning the characteristics of STM, the relationship between STM and WM as well as the transition from STM to LTM. Short-term memory: meaning and system(s) It is a storage system that includes several subsystems with limited capacity.

Rather than being a limitation, this restriction is an evolutionary survival advantage, since it allows paying attention to limited but essential information, excluding confounding factors. It is the classic example of the prey that must focus on the hostile environment to recognize a possible attack by the predator.

Given the functional peculiarities of the STM (collection of sensorial information), the subsystems are closely related to the modalities of sensory memory. As a consequence, there have been several sensorial-associated subsystems postulated, including the visuospatial, phonological (auditory-verbal), tactile, and olfactory domains.

  • These subsystems involve different patterns and functional interconnections with the corresponding cortical and subcortical areas and centers.
  • The concept of working memory In 1974, Baddeley and Hitch developed an alternative model of STM which they termed as working memory.
  • Indeed, the WM model does not exclude the modal model but enriches its contents.

On the other side, the short-term store can be used to characterize the functioning of the WM. WM refers more to the entire theoretical framework of the structures and processes used for the storage and temporary manipulation of information, of which STM is only a component.

In other words, STM is a functional storage element, while WM is a set of processes that also involve storage phases. WM It is the memory that we constantly use, which is always “online” when we have to understand something or solve a problem or make an argument, the cognitive strategies for achieving short term goals.

The proof of the importance of this sort of ‘operating system’ of memory shows by the evidence that WM deficits are associated with several developmental disorders of learning, including attention-deficit hyperactivity disorder (ADHD), dyslexia, and specific language impairment (SLI).

Short-term and Long-term memory These types of memory can be classically distinguished based on storage capacity and duration. The capacity of the STM, indeed, has limitations in the amount and duration of information it can maintain. In contrast, LTM features a seemingly unlimited capacity that can last years.

The functional distinctions between systems of memory storing and the exact mechanisms for how memories transfer from ST to LTM remain a controversial issue. Do STM and LTM represent one or more systems with specific subsystems? Although the STM probably represents a sub-structure of the LTM, which is a sort of long-term activated storage, rather than looking for a ‘physical’ division, it seems appropriate to verify the mechanisms of transition from a memory that is only a passage to a lasting memory.

  • Although the classic multi-modal model proposed that storage of ST memories occurs automatically without manipulation, the matter seems to be more involved.
  • The phenomenon concerns quantitative (number of memories) and qualitative (quality of memory) features.
  • Regarding quantitative data, although the number of Miller of 7 +/- 2 items identifies the number of elements included among individual slots, the grouping of memory bits into larger chunks (chunking) could allow storing a lot more information of bigger size and continuing to keep the magic number.
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The qualitative issue, or memory modulation within processing, is a fascinating phenomenon. It seems that the elements of STM undergo processing, which provides a sort of editing that involves the fragmentation of each element (chunking) and its re-elaboration and re-elaboration.

  • This phase of memory processing is called encoding and can condition subsequent processing, including storage, and retrieval.
  • The encoding process encompasses automatic (without conscious awareness) and effortful processing (through attention, practice, and thought) and allows us to retrieve information to be used to make decisions, answer questions, and so on.

There are three pathways followed during the encoding step: the visual (information represented as a picture), acoustic (information represented as a sound), and semantic encoding (the meaning of the information). The processes interconnect with each other, so that information is broken down into different components.

During recovery, the pathway that has produced the coding facilitates the recovery of the other components through a singular chain reaction. A particular perfume, for instance, makes us recall a specific episode or image. Of note, the encoding process affects the recovery, but the recovery itself undergoes a series of potential changes that can alter the initial content.

In neurofunctional terms, the difference between STM and LTM is the occurrence, in the LTM, of a series of events that must fix the engram(s) definitively. This effect occurs through the establishment of neural networks and expresses as neurofunctional phenomena including the long term potentiation (LTP) which is an increase in the strength of the neural transmission deriving from the strengthening of synaptic connections.

  • This process requires gene expression and the synthesis of new proteins and is related to long-lasting structural alterations in the synapses (synaptic consolidation) of the brain areas involved such as the hippocampus is the case of declarative memories.
  • The role of the hippocampal network Of note, the hippocampal neurogenesis regulates the maintenance of LTP.

However, the hippocampal network, including the parahippocampal gyrus, hippocampus, and neocortical areas is not the place where memories are stored, but it has a crucial role in forming new memories and in their subsequent reactivation. It seems that the hippocampus has a limited capacity and acquires information quickly and automatically without keeping it for long.

Over time, the originally available information becomes permanent in other brain structures (in the cortex), independently from the activity of the hippocampus itself. The crucial mechanism of this transfer is the reactivation (“replay”) of the configurations of neural activity. In other words, the hippocampus and the medial temporal structures connected to it are crucial for holding an event as a whole as it distributes in an organized way memory traces.

It is an operating system that through different software can store, organize, process, and recover hardware files. This hippocampal-guided reactivation (retrieval) leads to the creation of direct connections between the cortical traces and then to the formation of an integrated representation in the neocortex including the visual association cortex for visual memory, the temporal cortex for auditory memory, and the left lateral temporal cortex for knowledge of word meaning.

What does STM and LTM stand for?

STM: Short-term memory. LTM: Long-term memory.

What is STM in logistics?

Sea Traffic Management (STM): an effective tool for decarbonisation and safety of navigation In recent years, the transport in line with communication, liberalization, and international standardization shaped the four pillars of globalisation. Maritime transport known as the backbone of the global trade as more than 90 percent of world cargo, in volume, in carried by sea.

  1. Among all transport modes, shipping is the most cost-effective way of cargo transport.
  2. According to a report from the EU commission in 2014, almost 90 % of the European Union’s external freight and 40 % of its internal freight moved by sea.
  3. However, maritime transport still suffers from problems like lack fast increasing share of GHG emission and marine accidents.

As a misconception, shipping is not moving from a port to another port, not exclusively a navigational process but includes a large number of processes, such as traffic management, fuel consumption management, safety of navigation, towage, availability of pilots, availability of bunker, cargo handling, customs, immigration, port berthing, classification surveys, and etc.

Many of these processes not only add administrative and financial burdens but also resulted in more energy consumption and consequently higher environmental impacts. Shipping and port activities together expose externality costs, mainly health-cost, on local people while increasingly contributing to global GHG emission.

Currently, one of the main common challenges of many European port-cities regions are the local-global mismatch, as the benefits to the local communities is less than the externality costs. Furthermore, marine accidents such as collisions, groundings along with oil pollutions have affected the different aspects of the lives in the coastal cities such as in fishing, tourism, fresh-water generating industries.

The maritime transport contributes to global GHG emission and sea pollutions Emissions from maritime transport account for 3% of global greenhouse gas emissions today – equivalent to more than the total annual emissions of Germany – and this share expected to rise to 5% by 2050. In this respect, under the IMO new strategy on the reduction of GHG emissions from ships, there will be a pathway of CO2 emissions reduction, consistent with the Paris Agreement temperature goals, targeted to reduce at least 50% greenhouse gas (GHG) emissions from the global shipping sector by 2050, compared to 2008.

At the Europe level, the EU is calling for a global approach to reducing greenhouse gas emissions from international shipping – a large and growing source of emissions. The Commission’s 2011 White Paper on transport suggests that the EU’s CO2 emissions from maritime transport should be cut by at least 40% from 2005 levels by 2050, and if feasible by 50%.

Monitoring, Reporting and Verification(MRV) of CO2 emissions from large ships using EU ports Greenhouse gas reduction targets for the maritime transport sector Further measures, including market-based measures, in the medium to long-term.

A solution to counteract the shipping environmental impacts It is also widely recognised that today’s shipping activities principles have not changed much for a century, and not necessarily well adapted to modern demands of our digitalised era. In order to meet cost-saving targets and reduce environmental impact, it is strongly recommended that shipping also to be controlled with the same precision as the aviation system.

It means to have traffic management systems that micromanage the routing and timing of entire shipping lanes. Within the concept of Traffic management for ports, all vessels need to be managed by a traffic management centre. In the light of new technologies such as digitization and policies in place, sea transport can be more synchronized and transparent within the entire transportation system.

The actors and stakeholders involved in ships operations For any port to plan and schedule the operations accurately, it is needed to have access to the information about the plans and progress at the previous port, the sea voyage/passage, and hinterland transport serving the port.

  • It significantly reduces the vessels waste time and its related fuel consumption.
  • As a solution, along with the introduction of the digitization in the maritime sector, Shipping Traffic Management (STM) is a part of the multimodal logistics chain, empowering sea operations and shore-based operations as well within the scope of berth-to-berth.

It means that all actors in the whole chain of activities from the berth at the point of origin, in the sea voyage, and in the berth at the point of destination should be part of an information flow. Schematics of enhanced Sea Transport by STM, as a part of a multi-modal chain of operations, Source: For shipping, just-in-time is critical when approaching ports as it contributes to reduce the delays and to save fuel consumption.

The various actors need to synchronize their processes ensuring the necessary services are provided when needed. In this respect, the players in the maritime transport sector require to agree on standardised data-exchange on an international level same as the platform applied at the regional project of MONALISA in Europe.

Based on the STM projects, for the ship to shore date exchange the information owner: the ship or the shipping company, selects the partners, which are allowed to receive the information. The information to be sent in IP-format over any communication channel.

  • Cyber Security is ensured by the service and identity registries in the Maritime Connectivity Platform.
  • The important onboard equipment is the latest version of the Electronic Chart Display and Information System (ECDIS) on the vessel.
  • Even though the connectivity is improving extremely in recent years, but the constant connection is not a requirement in the STM approach.
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A function stores messages from the ships until a good enough communication channel is available. Sea Traffic Management connects the maritime world in real time, with efficient information exchange. STM aims to create a safer, efficient, and more environmentally friendly maritime industry.

Route optimisation services Ship to ship route exchange Enhanced Monitoring Port Call Synchronisation Winter Navigation

A distributed data-sharing design in a centralised management framework will also give more room for new actors to enter the domain. It also provides new services that build on data made availability by the various stakeholders. Therefore, the concept of STM supports a cooperative and coordinated model of data sharing and using all data from the maritime space in a real-time framework, in order to improve safety, environmental performance and efficiency in the maritime transport chain.

This figure shows different networks of data sharing. STM project in Europe European Union has targeted to improve the availability of more reliable and real-time data from shipping activities to use for statistical purposes, for example, on routes, type of goods, as well as the type of vessels and port calls.

It is highlighted in on reporting formalities for ships arriving in and/or departing ports of the Member States, and on establishing a Community vessel traffic monitoring and information system (VTMIS)) In 2009, the concept of Sea Traffic Management (STM), led by the Swedish Maritime Administration, started to take form in an EU-funded project (MONALISA).

Then, STM aimed at enhanced safety by allowing ships to share their intentions and routes with shoreside actors like VTS or Port Control. At the same time, ports were given the opportunity to receive real-time ETA data during the sea passage from departure berth to arrival berth. The need for standardisation and the potential of the data-sharing of voyage plan information, both spatial and temporal, past, present and intended all elaborated.

Access to the updated information from ships regarding arrival times, and what services they need, would allow the European ports to plan and become much better service providers. The synchronisation of EU ports’ activities can be achieved by making partnerships of relevant policymakers at regional levels.

Within the European territorial cooperation, the partners from successfully implemented and validated STM policies/programs like Mice, Monalisa and Monalisa.2 projects are expected to maximise the profit of both ship and port sides while minimising the costs in a systematic way to meet the low-carbon economy approach.

Through the STM approach, three categories of Regulations, Environment and Economy are addressed, as listed below: Sea Traffic Management is an effective proved tool to structure the EU ports relations with shipping activities in VTS, port calls, logistics, cargo flow, pilotage, bunkering, the safety of navigation and etc., within a standardised framework.

  1. The main result will be decarbonization of the transport along the cost control by minimizing the resources required to steam between two ports.
  2. Another important result is the enhancement in the regional safety of maritime transport.
  3. Furthermore, it helps meeting the European environmental and Energy Directives and strategies like in maritime section of TEN-T network.

There other benefits for direct and indirect stakeholders engaged in STM activities. Public benefits from a decrease in the number of marine accidents and avoiding sensitive areas. For ports, resource optimized utilization will be a significant gain as less resource like tug boats need to be on “stand by”.

  • In addition, shorter port calls lead to less emission in the port area.
  • For authorities and governments, visibility through continuous monitoring is an achievement.
  • It reduces the risk of accidents while bringing more efficient Search & Rescue (SAR).
  • For the indirect actors like cargo-owners, the predictability of goods arrival and departures will be an advantage for easier planning together with logistics actors.

By Reza Karimpour : Sea Traffic Management (STM): an effective tool for decarbonisation and safety of navigation

What is STM on Reddit?

I’m a second time mom so I know for a fact that this is just a phase.

What is SMT in gaming?

Final word – SMT describes Simultaneous Multithreading and is a technology adopted by both AMD and Intel in all of their modern desktop CPUs. In Intel CPUs, this technology is named Hyperthreading but refers to the same technology. SMT is a technology that allows a CPU to run two instructions (threads) simultaneously per core, effectively doubling the number of CPU cores.

Who can use Smt?

(Kumari) or Smt. (Shrimati) before their names. Kumari is often used to denote an unmarried woman while Shrimati is used for married women.

Is Smt used for men?

smt. (followed by name of bride) Shrimati Explanation: Shrimati Smt. (Shrimati) is the standard honorific (akin to Mrs. in English) used when referring to an adult female (only for married women) in various Indian languages, including Bengali, Hindi, and Sanskrit, and sometimes in English as well (in an Indian context).

The equivalent title for men is Shri (often written Sri). – Note added at 27 mins (2010-01-03 09:48:04 GMT) – Yes, I would leave it as Shrimati, adding (Ehefrau) in brackets, as you suggest. Notes to answerer Asker: Thank you, Sabina, that was quick! Would you leave it as is, with Frau – I’m translating to German – in brackets? Asker: Will do.

Have a sunny Sunday, and a gratifying New Year!

What is Smt in PC?

Simultaneous multithreading (SMT) is a processor design that combines hardware multithreading with superscalar processor technology. Simultaneous multithreading can use multiple threads to issue instructions each cycle.

What is the difference between IS and STM?

The II is the second version of the particular lens. If everything else is the same but the II (some have III and if I recall there may be a few with a IV) it means it is a later model of that lens. STM is a type of focus motor. The STM focus motor focus faster than everything but a USM focus motor.

What is speed to market STM?

What is Speed to Market? – Speed to market (STM) is the time it takes to deliver a product, website, or landing page (among other projects) from its inception to when it is launched. As a KPI, speed to market can often be observed as one metric to measure the success of a launch.

What’s the difference between IS and IS STM?

What is the difference between the Canon 55-250 IS II and 55-250 IS STM lenses? First, let’s get a bit of nomenclature out of the way: EF-S means a lens in the Canon EOS system that will only work on cameras with APS-C or smaller sensors (if any smaller than APS-C EOS sensors are ever created).

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They can not be used on cameras with larger 35mm film sized “full frame” sensors.55-250mm is the focal length of the lens. On an APS-C camera, a 55-250mm lens gives the same approximate field of view/angle of view that an 88-400mm lens would give on a 35mm film camera or FF digital camera. This only matters if you are familiar with 35mm focal lengths and want to know what the “equivalent” angle of view would be on cameras with a different format size sesnor.

f/4-5.6 refers to the lens’ maximum aperture. A lower f-number is a wider aperture which lets more light into the lens. This allows a faster shutter time or lower ISO to be used when desired. Both of these lenses have a maximum aperture of f/4 at 55mm. The maximum aperture gradually narrows at focal lengths between 55m and 250mm.

At 250mm the maximum aperture is at f/5.6. IS Image stabilization is a technology that helps to counteract movement of the camera/lens during the duration of an exposure. It allows using longer shutter times without blur caused by camera motion when the camera is handheld than would otherwise be possible.

It does not help with motion blur caused by movement of the subjects in your photos. Only a shorter shutter time can do that. II The Roman numeral two. It indicates that this is a second, updated version of a previous lens with the same name (other than the addition of the “II”).

History of the series: 2007 – The EF-S 55-250mm f/4-5.6 IS with micromotor AF was introduced2011 – The EF-S 55-250mm f/4-5.6 IS II replaced the original version with the same optical formula and micromotor AF as the 2007 lens, but with an updated IS software and external cosmetic changes2013 – The EF-S 55-250mm f/4-5.6 IS STM was introduced with a completely new optical formula and a different kind of ‘focus-by-wire’ AF motor referred to as a ‘Stepping Motor’ (STM)

Both the EF-S 55-250mm f/4-5.6 II (2011) and the EF-S 55-250mm f/4-5.6 STM (2013) were sold concurrently for several years before the 2011 lens was removed from Canon’s catalog. The STM was discontinued by Canon in the Spring of 2021 along with an extensive list of other EF and EF-S lenses as the company concentrates on their newer RF line of lenses for the mirrorless R series of cameras.

Two different optical formulae. Even though the names are very similar, the optical formulae of the lenses are not the same. The EF-S 55-250mm f/4-5.6 IS II (2011) is optically identical to the earlier EF-S 55-250mm f/4-5.6 IS (2007). Though not always the case when comparing an original version to the “II” version of a lens from Canon, the differences between the original 55-250mm “IS” and the “IS II” are purely cosmetic other than an updated IS (image stabilization) firmware. These lenses had 12 lens elements in 10 groups. The “STM” (2013), on the other hand, has 15 lens elements in 12 groups. The way the focusing elements in the lens are moved. The original 55-250mm “IS” (2007) and “IS II” (2011) had micromotor autofocus. This is the most basic (and cheapest) type of AF motor in Canon EOS lenses. They’re good enough, but they are neither as fast nor as quiet as Ultrasonic Motor (USM) AF units found in higher end Canon EOS lenses. The newer “IS STM” (2013) uses a newer type of stepping motor to move the lenses focusing elements.

Optical formula Differences in optical design, of course, can affect the optical performance of the lens. In this case the “IS II” and the “IS STM” are very similar from 55mm to about 100mm. Beyond 100mm the general consensus of most reviewers is that the newer STM lens maintains more or less the same level of “sharpness” all the way to 250mm, while the older “IS II” begins to become increasingly soft as it is used at 135mm and beyond, with the the worst decrease in performance coming at the longest 250mm focal length (“zoomed in all of the way”), particularly at the edges and in the corners of the frame.

  • The other significant difference in the optical design is that the increased number of lens elements in the “STM” are in the rear of the lens to allow the lens to use internal focus.
  • This allows the “STM” lens to focus without rotating or moving the front of the lens barrel forward/rearward as the focus is adjusted.

The front barrel of the “IS II” rotates and moves in/out as the focus is adjusted. The front barrel of the “STM” does move in/out when zoomed, but the barrel does not rotate during zooming. If one is using polarizers or graduated neutral density filters that are affected by lens rotation this can be a distinct advantage as the filter does not require adjustment every time the focus distance is changed.

  1. Focusing system The were designed to be smoother and quieter than micromotor AF.
  2. The advantages for shooting video should be obvious: focus can be altered during a shot with smooth transition from one distance to the other while also being quieter and less likely to be picked up by the camera’s microphone.

Compared to micromotor lenses, the STM lenses tend to be faster focusing as well as smoother and quieter. The are optimized for shooting still images. They’re also usually fairly quiet, but they place a premium on focusing as fast as possible without worrying about any “jerkiness” between focus positions.

  1. The emphasis is to get to the desired focus position as soon as possible so the still photo can be taken NOW.
  2. One additional key difference between most micromotor AF lenses and STM has to do with manual focusing.
  3. To manually focus a micromotor lens, the AF/MF switch must be moved from AF (autofocus) to MF (manual focus).

The lens is then focused using a mechanical connection between the focusing ring on the lens and the lens elements inside the lens. Moving the focusing ring with the switch set to ‘AF’ can damage the focusing mechanism. With the ‘AF/MF’ switch set to ‘MF’, the lens can be focused even when not connected to a camera.

  • There is no direct mechanical connection between the focusing ring and the lens’ focusing elements.
  • When the focusing ring is turned it sends a signal to the camera which sends a signal back to the lens telling the focusing element to move.
  • The finest focus adjustment that can be made, even in manual focusing, is a single ‘step’ of the AF motor.

This allows ‘full-time’ manual focusing, even when the ‘AF/MF’ switch is set to ‘AF’. It also requires the lens to be attached to a camera that is powered on to move the focusing mechanism. (Most USM lenses are full-time manual focus via a mechanical connection between the focusing ring and the USM’s ring inside the lens.

The “STM” is a slightly better optical performer. The “STM” has faster, quieter AF, but does require the ‘focus-by-wire’ connection to focus in discrete steps. The “IS II” can be manually focused without any power from the camera and can be focused in finer differences than the smallest ‘step’ of the stepper motors in STM lenses. The “IS II” is generally cheaper, which allows the money saved to be spent on another lens or piece of lighting gear or other accessories.

For most folks the newer EF-S 55-250mm f/4-5.6 IS STM would be the more desirable choice in all but budgetary considerations. But the older “IS II” is certainly capable of taking good photos almost on par with the newer model. : What is the difference between the Canon 55-250 IS II and 55-250 IS STM lenses?