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DDS

The Doctor of Dental Surgery (DDS) is a doctoral awarded to individuals who complete an accredited of in , typically spanning four years of graduate-level education following prerequisite undergraduate coursework in sciences such as , chemistry, and physics. The equips recipients with the knowledge and clinical skills necessary to diagnose, prevent, and treat disorders of the teeth, gums, and related oral structures, including restorative procedures, extractions, and basic oral surgeries. Equivalent in scope and rigor to the Doctor of Dental Medicine (DMD) degree, the DDS designation reflects historical nomenclature preferences of individual dental schools rather than substantive differences in curriculum, training, or professional qualifications; both prepare graduates for licensure exams and . DDS programs emphasize a blend of , preclinical simulations, and supervised patient care, culminating in competency in areas like , periodontics, and . Originating in the United States during the mid-19th century amid efforts to formalize as a distinct separate from barber-surgeons and general , the DDS marked the shift toward structured training, with early schools like the Baltimore College of Dental Surgery establishing the model for evidence-based oral health education. Defining characteristics include mandatory accreditation by bodies such as the Commission on Dental Accreditation (), rigorous admissions based on performance, DAT scores, and interviews, and a focus on ethical practice amid ongoing debates over expanding scopes like cosmetic procedures versus core preventive care. While the degree has enabled advancements in public oral health through standardized training, it has faced scrutiny for high educational costs and varying state licensure reciprocity, underscoring tensions between professional autonomy and regulatory oversight.

Professional Degrees

Doctor of Dental Surgery

The Doctor of Dental Surgery (DDS) is a professional doctoral degree awarded to graduates of accredited dental schools in the United States and select other countries, qualifying them to pursue licensure for the practice of general dentistry. The program typically spans four years following a bachelor's degree and emphasizes biomedical sciences, clinical skills, and patient management to address oral health conditions including caries, periodontal disease, and malocclusion. Holders of the DDS must complete national and state examinations to obtain a license, as the degree alone does not confer legal authority to practice. The DDS originated as dentistry transitioned from apprenticeship-based training to formalized in the mid-19th century, with the first dedicated dental colleges establishing structured curricula separate from medical schools. By the late 1800s, programs awarded the DDS to signify competency in surgical aspects of oral care, reflecting dentistry's roots in operative procedures rather than purely medical paradigms. This degree nomenclature persists alongside the Doctor of Dental Medicine (DMD), introduced later at Harvard in , but both represent identical educational standards and professional qualifications, with no substantive differences in training or . Admission to DDS programs requires a from an accredited , completion of prerequisite in sciences such as , general and , physics, and , and strong performance on the (DAT). Most programs mandate at least 90 semester hours of undergraduate credit, though a full bachelor's is standard, with average DAT scores for matriculants around 20-21 out of 30 as of recent cycles. Curricula integrate foundational sciences like , , and in the initial years, transitioning to preclinical simulations (e.g., mannequin-based restorations and prosthetics) and extensive clinical rotations in years three and four, where students treat patients under supervision to achieve competencies in , operative , , and oral surgery. Programs accredited by the Commission on Dental Accreditation () ensure uniformity, with approximately 66 U.S. schools offering DDS or equivalent DMD tracks as of 2023. Upon earning the DDS, graduates must pass the Integrated (INBDE), a comprehensive written assessment of biomedical, clinical, and behavioral sciences, to meet federal portability standards under the Interstate Commission framework. State licensure further requires clinical proficiency demonstrations, often via live-patient or exams administered by bodies like the American Board of Dental Examiners, or completion of a one-year postgraduate residency in states such as . As of 2023, all states mandate CODA-accredited DDS/DMD graduation plus these exams, with renewal involving credits to maintain standards. Advanced training via residencies or specialties (e.g., ) follows for those seeking narrower expertise, but general practice licensure stems directly from the DDS foundation.

Engineering and Technology

Direct Digital Synthesis

Direct digital synthesis (DDS) is a technique for generating precise analog s, typically sine waves, by digitally computing the samples and converting them to analog via a (DAC). The core process involves a accumulator that increments by a tuning word at the reference clock rate, producing a ramp whose most significant bits address a sine to yield amplitude values. These digital samples are then filtered post-DAC to remove clock harmonics, yielding a clean analog output. The output in a basic DDS system is determined by the formula f_{out} = \frac{M \cdot f_{clk}}{2^N}, where M is the frequency tuning word, f_{clk} is the system clock , and N is the number of bits in the phase accumulator. This allows fine proportional to f_{clk}/2^N, enabling sub-Hertz steps with high clock rates and large N. and control are achieved by adding offsets to the accumulator or outputs, respectively, supporting modulation schemes like (FSK) or (PSK). DDS offers advantages over analog synthesis methods, including rapid frequency switching (limited only by clock rate and settling time), excellent frequency agility without mechanical components, and inherent digital stability against temperature and aging effects. However, limitations include spurious signals from DAC glitches and clock feedthrough, which require careful filtering and dithering techniques for mitigation, as well as a maximum output frequency typically below half the clock rate due to Nyquist constraints. Modern DDS integrated circuits, such as those from , incorporate features like phase-locked loops (PLLs) to multiply the reference clock, extending usable output frequencies into the GHz range while maintaining low . The concept of direct digital frequency synthesis was first proposed by J. Tierney, C. Rader, and B. Gold in a 1971 paper, leveraging early digital computing for waveform generation. Practical adoption accelerated in the and with advances in , enabling compact, low-power implementations for commercial signal generators and synthesizers. Applications of DDS span communications as local oscillators and modulators, test and measurement equipment for arbitrary waveform generation, radar systems for agile signal sources, and audio synthesis for precise tone production. In , DDS facilitates dynamic spectrum agility, while in biomedical devices, it supports signal generation with high purity. Emerging uses include / base stations for and phased arrays, where DDS's digital precision aids in multi-channel synchronization.

Data Distribution Service

The Data Distribution Service (DDS) is an open middleware standard developed by the (OMG) for enabling scalable, real-time data exchange in distributed systems via a data-centric publish-subscribe model. This architecture decouples data producers (publishers) from consumers (subscribers) by focusing on typed data topics rather than specific endpoints, allowing applications to declare interest in data content without direct knowledge of sender or receiver identities. DDS supports configurable (QoS) policies—such as reliability, durability, latency budgets, and deadlines—that enable fine-tuned control over data delivery, making it suitable for mission-critical environments where predictability and are paramount. DDS employs a global data space abstraction, where data instances are identified by keys and managed through discovery mechanisms that automatically propagate participant and topic information across the network using or other transports. Core entities include DataWriters for publishing updates, DataReaders for subscribing to them, and Topics defining data schemas with built-in support for content filtering and history management to handle transient failures or varying network conditions. Unlike traditional , DDS prioritizes data state over event notifications, ensuring subscribers receive coherent views of shared data even upon late joins, which enhances in heterogeneous systems spanning multiple programming languages, operating systems, and hardware platforms. Development of the DDS specification began in 2001 as a response to demands from defense and aerospace sectors for standardized data distribution in complex, real-time applications. The initial version was submitted to OMG in 2003 and formally adopted in 2004, with subsequent revisions including version 1.2 in 2007 for enhanced interoperability and version 1.4 in 2015 incorporating security extensions via the DDS Security specification. The standard has evolved through contributions from vendors and users, emphasizing backward compatibility and extensibility, such as integration with the Real-time Publish-Subscribe (RTPS) wire protocol for low-latency, deterministic communication. Key applications of DDS include systems for and command dissemination, as in unmanned aerial vehicles; defense networks for tactical data links; and autonomous vehicles requiring high-frequency across ECUs. It is also deployed in for real-time diagnostic equipment synchronization, power grid management for fault detection, and industrial automation for scalable connectivity, where its plug-and-play reduces deployment complexity in dynamic environments. Commercial implementations from vendors like RTI Connext and Twin Oaks CoreDX provide DDS-compliant in languages such as C++, , and , supporting deployments on embedded devices up to cloud-scale clusters with throughput exceeding millions of updates per second under constrained .

Organizations and Movements

Governmental Departments

The Disability Determination Services (DDS) are state-level agencies in the United States, fully funded by the federal government through the (), responsible for conducting initial medical evaluations and determinations of eligibility for () and () claims. These agencies operate in all 50 states, the District of Columbia, and U.S. territories, employing medical and vocational experts to review evidence such as medical records, consultative examinations, and claimant statements, with decisions typically issued within 3-5 months of application. DDS decisions can be appealed through 's administrative review process, including reconsideration, hearings by administrative law judges, and further federal court review. Several U.S. states maintain Departments of Developmental Services (DDS) focused on providing community-based supports, residential programs, and services for individuals with intellectual and developmental disabilities, including disorders. For instance, California's DDS, established under , oversees regional centers that coordinate individualized service plans for approximately 400,000 eligible consumers as of 2023, with an annual budget exceeding $10 billion allocated to vendor contracts and direct supports. Similarly, ' DDS, created by 19B of the General Laws in 1986, serves over 30,000 individuals through day programs, family support grants, and group homes, emphasizing deinstitutionalization since the closure of facilities like the in the . Connecticut's DDS partners with families and providers to deliver services under a 2012 aimed at reducing institutional reliance. The Department of Driver Services (DDS), formed on July 1, 2005, by consolidating functions from the former Department of Motor Vehicle Safety, administers driver's licensing, identification cards, and road test examinations for over 8 million licensed drivers, enforcing state laws on vehicle registration and traffic safety. It processes more than 1 million license transactions annually and maintains a database integrated with federal REAL ID compliance standards since 2012. At the federal level, the Defense Digital Service (DDS), established in 2015 within the U.S. Department of Defense, deploys teams of technologists to modernize IT systems, enhance cybersecurity, and integrate for mission-critical applications, reporting to the Chief Digital and Artificial Intelligence Office as of 2022. The District of Columbia's Department on Disability Services (DDS) coordinates rehabilitation, , and programs across two administrations for residents with physical and developmental disabilities.

Political Groups

Diehard Duterte Supporters (DDS) refers to an informal, in the dedicated to , who served as president from June 30, 2016, to June 30, 2022. The group emerged prominently during Duterte's 2016 presidential , where supporters self-identified under the DDS label to rally behind his , tough-on-crime , contributing to his victory with over 16 million votes, the largest mandate in Philippine presidential history at the time. DDS adherents, often from working-class and rural backgrounds, emphasized Duterte's direct governance style and rejection of elite-dominated politics, framing their loyalty as a counter to perceived bias in media and institutions. The acronym DDS originally denoted the Davao Death Squad, a vigilante group accused of extrajudicial killings in Davao City during Duterte's tenure as mayor from 1988 to 2016, with human rights organizations estimating hundreds of deaths linked to such operations targeting suspected criminals. Supporters later reclaimed and reinterpreted DDS as "Diehard Duterte Supporters" to distance it from violent connotations and highlight ideological commitment, a shift evident in online campaigns and rallies by 2016. This rebranding facilitated mobilization, including social media amplification and troll networks accused of harassing critics, though Duterte allies described these as organic defenses against opposition disinformation. Empirical data from the 2016 election showed DDS-driven voter turnout in Mindanao exceeding national averages by 10-15 percentage points in Duterte strongholds. Post-2016, DDS influenced policy advocacy for Duterte's drug war, which official data reported resulted in over 6,000 deaths by police operations alone between 2016 and 2022, though supporters argued these figures reflected necessary deterrence against narcotics syndicates amid prior crime surges. The movement extended support to Duterte's daughter in her 2022 vice-presidential win, securing her 33 million votes, but fractured amid 2024-2025 alliances with the administration, prompting DDS calls for "" protests against perceived betrayals. Critics from groups and outlets like the , often aligned with anti-Duterte factions, label DDS as enabling authoritarian tendencies, while independent analyses attribute its persistence to causal factors like economic disenfranchisement and distrust in pre-Duterte governance failures, evidenced by persistent approval ratings for Duterte above 70% in 2022 SWS polls despite controversies. DDS operates without formal structure, relying on decentralized networks via platforms like and Telegram, with estimates of active online participants in the millions based on hashtag trends during key events, such as #Duterte2028 pushes in 2025. Its role underscores populist dynamics in , where loyalty transcends party lines—DDS backed Duterte's PDP-Laban affiliation but prioritized personal fealty over . While mainstream sources decry DDS for , including doxxing incidents documented in 2021 Commission on Elections reports, causal realism points to reciprocal escalation from opposition "Dilawan" networks, fostering polarized echo chambers that sustained Duterte's 2019 midterm congressional dominance with 9 of 12 seats allied to him.

Private Entities

Die-hard Duterte Supporters (DDS) denotes the dedicated cadre of individuals backing , who served as from June 30, , to June 30, 2022. The label, self-adopted by proponents, emerged prominently during his 2016 and presidency, encompassing grassroots activists, users, and rally attendees who championed his tough-on-crime stance, including the anti-drug that official data attributes to over 6,000 deaths by police action as of 2018, with higher estimates from groups exceeding 20,000 total fatalities. This informal network operates independently of formal , mobilizing through platforms like groups and public demonstrations to counter opposition narratives and promote Duterte-aligned candidates, such as in the 2022 national elections where secured the vice presidency with 61.11% of the vote amid alliance with Jr. DDS activities include amplifying defenses of Duterte's governance, which reduced crime rates in surveyed areas like by up to 30% in early years per reports, while critics in outlets like and —potentially influenced by institutional biases favoring frameworks over security outcomes—label them as trolls propagating . The acronym DDS traces roots to the , an alleged vigilante outfit in during Duterte's multiple mayoral terms (1988–1998, 2001–2010, 2013–2016), implicated in extrajudicial executions of suspected criminals numbering in the hundreds according to investigations, though Duterte has denied operational ties, attributing actions to community self-policing amid rising in the . Supporters repurposed the term defiantly post-2016, transforming a stigmatized reference into a of unyielding loyalty, with sustained activity evident in 2025 rallies drawing tens of thousands for Duterte's birthday events.

Other Uses

Scientific and Medical Applications

Drug delivery systems (DDS) refer to formulations and technologies designed to transport pharmaceutical compounds to targeted sites within the body, optimizing therapeutic efficacy while minimizing adverse effects and improving pharmacokinetic profiles. These systems address limitations of conventional , such as poor , rapid clearance, and non-specific distribution, by enabling controlled, sustained, or site-specific release. DDS have evolved from simple encapsulation methods to sophisticated nanocarrier-based platforms, with applications spanning , chronic management, and . The historical development of DDS traces back to the mid-20th century, with early innovations focusing on sustained-release oral formulations in the 1950s and 1960s, followed by the introduction of patches in the 1970s and implantable devices in the 1980s. A pivotal advancement occurred in 1974 with the FDA approval of the Alza Corporation's Ocusert, an ocular insert for delivery, marking one of the first commercial controlled-release systems. By the 1990s, polymer-based matrices and liposomes gained prominence, paving the way for targeted therapies; for instance, Doxil (liposomal ) was approved in 1995 for , demonstrating reduced cardiotoxicity compared to free . Over the past two decades, integration has accelerated progress, with DDS now incorporating stimuli-responsive materials that release drugs in response to , , or enzymes at disease sites. Common types of DDS include oral systems like osmotic pumps and gastroretentive devices, which prolong gastric residence for drugs with narrow absorption windows; patches, such as those delivering or for steady plasma levels; injectable microspheres for depot formulations, exemplified by Lupron Depot for ; and inhalation aerosols for pulmonary delivery in conditions like . Nanoparticle-based DDS, including liposomes, polymeric micelles, and dendrimers, enhance and enable active targeting via ligands like antibodies, as seen in Abraxane (albumin-bound ), approved in 2005 for , which improved response rates over solvent-based formulations in clinical trials. Implantable systems, such as the Norplant contraceptive (discontinued but influential), provide zero-order for long-term release. Each type is selected based on properties, , and patient compliance needs, with and biodegradability critical for minimizing immune responses. In medical applications, DDS have revolutionized cancer therapy by facilitating tumor-specific accumulation via the , reducing systemic toxicity; for example, DDS loaded with chemotherapeutics like have shown up to 50% higher tumor uptake in preclinical models compared to free drugs. In neurodegenerative diseases, blood-brain barrier-crossing nanocarriers deliver agents like levodopa for Parkinson's, potentially extending therapeutic windows. DDS, such as antibiotic-eluting implants, combat biofilm-associated infections in orthopedics, with studies reporting 80-90% reduction in relapse rates post-surgery. DDS using lipid nanoparticles, as in the Pfizer-BioNTech approved in December 2020, encapsulate mRNA for efficient cellular uptake and without adjuvants. Challenges persist, including of nanomanufacturing and long-term safety, but DDS continue to expand therapeutic options, with over 50 FDA-approved nanotechnology-based products by 2023. Scientific research in DDS emphasizes , such as "smart" systems responsive to biomarkers for ; for instance, pH-sensitive polymeric DDS release payloads in acidic tumor microenvironments (pH 6.5-6.8) versus neutral physiological conditions (pH 7.4), achieving 3-5 fold higher local concentrations . and applications leverage viral-mimetic nanoparticles for delivery, overcoming immunogenicity issues of adenoviral vectors. Future directions include hybrid DDS combining diagnostics and therapy (theranostics), with magnetic resonance imaging-guided nanoparticles demonstrating dual imaging and in models, yielding median survival extensions of 20-30% in rodent studies. Rigorous preclinical validation, including biodistribution via radiolabeling and efficacy in orthotopic models, underpins translation, though off-target effects and regulatory hurdles like those under FDA's 505(b)(2) pathway remain focal points.

Miscellaneous Acronyms

In , Digital Data Service (DDS) designates a dedicated, synchronous leased-line service providing point-to-point transmission at speeds from 2.4 kbit/s to 56 kbit/s over twisted-pair copper facilities, employing alternate mark inversion encoding for error detection. Offered by and other carriers starting in the late 1970s, it utilized fractional T1/DS1 channels (DS0 slices) to deliver consistent performance for early networking, contrasting with analog services by guaranteeing and bit error rates below 10^{-6}. In , Digital Data Storage (DDS) refers to a sequential-access format derived from (DAT) cassettes, standardized in 1989 by , , and for reliable backup and archival of digital files. Employing helical-scan recording on 4 mm-wide tapes housed in cartridges measuring 73 mm × 54 mm × 11 mm, initial DDS-1 drives achieved uncompressed capacities of 2 at transfer rates up to 500 KB/s, with subsequent generations like DDS-3 (1996) reaching 12 native and DDS-5 (2003) supporting 36 , before obsolescence by higher-density alternatives like LTO. In and compiler theory, Data Dependence Subgraph (DDS) constitutes the subgraph of a program dependence graph (PDG) comprising solely edges, which model flow, anti-, and output dependencies among program statements to facilitate analyses such as optimization, parallelization, and detection. Extracted via data-flow algorithms on control dependence subgraphs, DDS enables quantitative similarity metrics in tools like SimilaR for code, where edge labels denote variable usage and labels capture syntactic elements, supporting applications in code clone identification with precision exceeding lexical methods. In , DDS abbreviates diaminodiphenylsulfone, the for dapsone (C_{12}H_{12}N_2O_2S), a derivative synthesized in 1908 and clinically deployed as an since the 1940s for multibacillary via inhibition of synthesis in . Administered orally at 100 mg daily in multidrug regimens per WHO guidelines, it also exhibits effects through inhibition, though hemolysis risks necessitate G6PD screening; its dual mechanism underpins off-label uses in conditions like prophylaxis at 50-100 mg/day.

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