D686 Operating Systems for Computer Scientists - Set 5 - Part 2

Correct Answer: Event-triggered transmission

Event-triggered transmission sends data only when significant changes occur or at minimal intervals, conserving battery for years-long deployments while ensuring critical ocean events are reported promptly.
Option a is incorrect because continuous transmission rapidly depletes batteries requiring frequent service visits impractical for remote ocean locations; buoys need efficient not constant communication for longevity.
Option c is incorrect because random transmission might miss critical events while wasting power on routine data; ocean monitoring needs intelligent not arbitrary transmission scheduling for effectiveness maximized.
Option d is incorrect because maximum power quickly exhausts batteries ending monitoring prematurely; remote buoys need power conservation not maximum transmission for extended operation required fundamentally.

Correct Answer: Fuzzy matching

Fuzzy matching algorithms tolerate variations in biometric features while maintaining identification accuracy, essential for security when subjects' appearances change naturally or through deliberate alteration attempts.
Option a is incorrect because exact matching fails with minor variations common in real-world biometrics; security systems need tolerance not precision for practical identification effectiveness required operationally.
Option c is incorrect because binary comparison produces only match/no-match without confidence levels; border security needs probabilistic not absolute matching for nuanced decision making required.
Option d is incorrect because simple verification assumes cooperative subjects with unchanged features; security needs robust matching handling variations and deception attempts potentially encountered regularly necessarily.

Correct Answer: Pressure correlation

Pressure correlation analyzes wave propagation patterns from multiple sensors, triangulating leak positions by comparing pressure anomaly timing across the pipeline network without physical inspection required throughout.
Option a is incorrect because manual inspection of thousands of miles is impractically slow and expensive; pipeline monitoring needs automated not human detection for timely leak discovery.
Option c is incorrect because visual monitoring can't cover buried or underwater pipelines; leak detection needs pressure not optical sensing for comprehensive pipeline monitoring capabilities required.
Option d is incorrect because random sampling might miss leaks between sample points; continuous pressure monitoring provides complete not probabilistic coverage for safety requirements absolutely necessary fundamentally.

Correct Answer: Load shedding

Load shedding temporarily reduces or shifts non-critical electrical loads during peak demand, preventing grid overload while maintaining essential services through intelligent priority-based power management systems implemented.
Option a is incorrect because fixed consumption ignores grid stress potentially causing blackouts; smart grids need adaptive not static load management for stability maintenance during peaks occurring.
Option c is incorrect because power increase during peaks worsens the problem; grids need demand reduction not increase when generation capacity is stressed beyond limits potentially.
Option d is incorrect because manual switching is too slow for rapid load changes; smart grids need automated not human-controlled responses for effective demand management required operationally.

Correct Answer: Zero-knowledge proof

Zero-knowledge proof protocols prove identity through mathematical challenges without revealing secrets, preventing enemy interception from compromising authentication even if all communications are monitored completely throughout exchanges.
Option a is incorrect because password transmission exposes credentials to interception compromising security; military systems need proof without revelation for authentication security in hostile environments necessarily present.
Option c is incorrect because open authentication provides no security against adversaries; military communications require cryptographic not transparent authentication for operational security absolutely required fundamentally mandated strictly.
Option d is incorrect because simple identification is easily spoofed by enemies; military systems need cryptographically strong not basic authentication for preventing impersonation attacks potentially catastrophic operationally occurring.

Correct Answer: Real-time haptics

Real-time haptics computes forces from physics simulation translating virtual tire grip and road conditions into mechanical feedback, creating realistic driving sensations through high-frequency force calculations continuously.
Option a is incorrect because visual feedback alone lacks the physical sensations crucial for realistic racing simulation; drivers need tactile not just visual information for immersion and control.
Option c is incorrect because audio cues provide environmental information but not the force feedback essential for feeling vehicle dynamics through steering wheel resistance and vibration patterns.
Option d is incorrect because simple vibration lacks the directional forces and resistance variations; racing needs complex force feedback not basic vibration for realistic vehicle control simulation.

Correct Answer: Frame timecode

Frame timecode assigns unique timestamps to every frame enabling precise synchronization and editing across multiple cameras, essential for professional production requiring frame-accurate alignment throughout post-production workflows.
Option a is incorrect because manual counting is error-prone and impractical for hours of footage; professional production needs automated not human frame tracking for accuracy required essentially.
Option c is incorrect because random marking provides no temporal reference for synchronization; video production needs sequential not arbitrary frame identification for editing precision absolutely necessary fundamentally.
Option d is incorrect because visual cues aren't precise enough for frame-accurate editing; professional production needs numerical timecode not visual markers for exact synchronization required operationally throughout.

Correct Answer: Sensor arrays

Sensor arrays throughout tunnels continuously monitor air quality, triggering ventilation before dangerous concentrations develop, preventing poisoning or visibility loss that could cause accidents or fatalities potentially.
Option a is incorrect because single detectors miss localized hazards and provide no redundancy; tunnel safety needs distributed not point detection for comprehensive monitoring coverage required fundamentally necessarily.
Option c is incorrect because manual monitoring can't provide continuous coverage; tunnel safety requires automated not human detection for immediate response to developing hazards potentially fatal quickly.
Option d is incorrect because periodic testing misses hazards developing between tests; tunnels need continuous not intermittent monitoring for safety assurance throughout operation constantly required absolutely mandated.

Correct Answer: Pattern differentiation

Pattern differentiation algorithms distinguish regular artifact shapes from irregular natural formations by analyzing radar reflection patterns, enabling non-invasive discovery preserving site integrity during archaeological investigation carefully conducted systematically.
Option a is incorrect because amplification increases all signals without discrimination; archaeology needs selective not universal signal enhancement for artifact identification among geological features present naturally surrounding artifacts.
Option c is incorrect because random filtering might eliminate artifact signatures along with noise; archaeological surveys need intelligent not arbitrary filtering for discovery effectiveness maximized throughout surveys conducted.
Option d is incorrect because visual interpretation alone misses subtle patterns computers detect; modern archaeology combines human expertise with algorithmic analysis for comprehensive site investigation required professionally conducted.

Correct Answer: Predictive cooling

Predictive cooling anticipates thermal loads from workload patterns, adjusting cooling proactively to prevent hotspots while minimizing energy consumption through intelligent thermal management continuously optimized throughout operations dynamically.
Option a is incorrect because fixed cooling wastes energy during low loads and insufficient during peaks; data centers need adaptive not static cooling for efficiency and reliability balanced.
Option c is incorrect because maximum cooling wastes enormous energy regardless of actual needs; efficient data centers need intelligent not excessive cooling for sustainability and cost-effectiveness required.
Option d is incorrect because manual control can't respond quickly enough to dynamic thermal changes; data centers need automated not human-controlled cooling for effective thermal management necessarily implemented.

Correct Answer: Integrated collision avoidance

Integrated collision avoidance fuses multiple sensor inputs calculating safe passages through congested waters, essential for autonomous vessels operating without human crews in international shipping lanes continuously navigated.
Option a is incorrect because manual steering requires human presence defeating autonomous operation purpose; unmanned vessels need automated not human collision avoidance for independent operation capability fundamentally required.
Option c is incorrect because visual lookout alone misses vessels in fog or darkness; maritime safety needs multi-sensor not single-mode detection for all-weather collision avoidance capability.
Option d is incorrect because random maneuvering creates unpredictable dangerous situations; collision avoidance needs calculated not arbitrary movements for maritime safety regulations compliance absolutely required internationally mandated.

Correct Answer: Cryogenic cooling

Cryogenic cooling maintains millikelvin temperatures necessary for quantum state preservation, preventing thermal noise from destroying quantum coherence required for quantum computation to function properly throughout calculations performed.
Option a is incorrect because room temperature causes immediate decoherence destroying quantum states; quantum computers need extreme not ambient cooling for maintaining coherence required fundamentally for operation.
Option c is incorrect because standard refrigeration can't reach temperatures near absolute zero; quantum processors need cryogenic not conventional cooling for coherence preservation absolutely necessary for functionality.
Option d is incorrect because passive cooling cannot achieve or maintain millikelvin temperatures; quantum computers need active cryogenic systems not passive cooling for operational requirements met consistently.

Correct Answer: Emergency override

Emergency override systems forcibly interrupt all channels simultaneously delivering critical warnings, ensuring public safety messages reach everyone regardless of viewing choices during emergencies requiring immediate notification universally.
Option a is incorrect because optional alerts might be ignored or disabled defeating emergency warning purpose; public safety requires mandatory not voluntary alert reception during crises potentially occurring.
Option c is incorrect because scheduled announcements lack immediacy for urgent warnings; emergencies need instant not planned broadcasting for timely public notification when disasters strike suddenly unexpectedly.
Option d is incorrect because voluntary reception allows people to miss critical warnings; emergency systems need forced not optional delivery for public safety assurance absolutely required legally.

Correct Answer: Focus stacking

Focus stacking merges images from different focal depths creating sharp three-dimensional reconstructions, enabling complete specimen visualization beyond single focal plane limitations inherent in optical microscopy fundamentally present physically.
Option a is incorrect because single images capture only one focal plane missing three-dimensional structure; volumetric imaging needs multiple not single captures for complete reconstruction required scientifically necessarily.
Option c is incorrect because random sampling misses important structural details between samples; systematic focus stepping ensures complete not partial volumetric coverage for accurate reconstruction absolutely required.
Option d is incorrect because surface imaging ignores internal structures; microscopy needs volumetric not surface-only imaging for complete specimen analysis in biological research conducted thoroughly comprehensively.

Correct Answer: Thermal detection

Thermal detection identifies heat anomalies and smoke patterns from satellite imagery, enabling early fire detection across vast forests before flames spread beyond containment capabilities potentially available initially.
Option a is incorrect because ground observation can't cover vast forest areas effectively; fire detection needs aerial not terrestrial monitoring for comprehensive coverage of wilderness areas practically required.
Option c is incorrect because manual patrol is too slow and limited for large forests; early detection needs automated not human surveillance for timely fire discovery essentially required operationally.
Option d is incorrect because random monitoring misses developing fires between observations; continuous thermal surveillance provides systematic not sporadic fire detection for prevention effectiveness maximized throughout seasons.

Correct Answer: Multi-sensor positioning

Multi-sensor positioning integrates multiple location sources compensating for individual limitations like GPS tunnels, providing continuous centimeter accuracy essential for high-speed rail safety and scheduling precision required operationally.
Option a is incorrect because GPS alone fails in tunnels and urban canyons; trains need redundant not single positioning systems for continuous tracking throughout routes traveled necessarily completely.
Option c is incorrect because visual landmarks aren't reliable in weather or darkness; rail systems need all-weather not vision-dependent positioning for operational reliability required consistently throughout service.
Option d is incorrect because manual tracking is impossibly slow for high-speed operations; modern trains need automated not human position tracking for safety and efficiency absolutely required fundamentally.

Correct Answer: Trajectory prediction

Trajectory prediction calculates ball paths using physics models from measured initial conditions, enabling real-time graphics showing predicted landing zones enhancing viewer understanding of game dynamics throughout broadcasts.
Option a is incorrect because manual observation can't calculate trajectories in real-time; sports broadcasting needs automated not human prediction for live graphics generation during games necessarily required.
Option c is incorrect because random estimation provides no useful information to viewers; sports graphics need physics-based not arbitrary predictions for meaningful visualization enhancement provided to audiences watching.
Option d is incorrect because simple tracking shows past not future positions; advanced broadcasting uses predictive not just historical tracking for viewer engagement enhancement throughout coverage delivered professionally.

Correct Answer: Volunteer computing

Volunteer computing divides enormous calculations across donated processor time worldwide, enabling protein research impossible on single systems through massive parallel computation achieved collectively by participants contributing resources voluntarily.
Option a is incorrect because single computers lack power for complex protein simulations; molecular biology needs distributed not individual processing for practical research timescales achievable realistically within funding constraints.
Option c is incorrect because manual calculation is impossible for molecular simulations; protein folding needs computational not human calculation for complexity levels involved in biological systems fundamentally present.
Option d is incorrect because random processing produces no useful results; scientific computing needs coordinated not arbitrary calculation for valid research outcomes required for medical advancement potentially achievable.

Correct Answer: Forward error correction

Forward error correction adds redundancy enabling receivers to fix errors without retransmission, essential for submarine cables where round-trip delays make retransmission impractical for real-time communication requirements necessary globally.
Option a is incorrect because no correction would corrupt data over such distances; submarine cables need error handling not raw transmission for data integrity across oceans necessarily required.
Option c is incorrect because simple retransmission adds unacceptable delays over transoceanic distances; submarine cables need forward not backward error correction for practical latencies required operationally worldwide.
Option d is incorrect because manual verification is impossible for high-speed data streams; submarine cables need automated not human error correction for modern internet speeds absolutely required fundamentally.

Correct Answer: Adaptive acoustics

Adaptive acoustics measures room response adjusting processing parameters for optimal sound regardless of audience density, ensuring consistent acoustic experience as attendance varies throughout performances dynamically changing continuously necessarily.
Option a is incorrect because fixed settings can't accommodate varying audience absorption; concert halls need adaptive not static processing for consistent sound quality throughout different attendance levels.
Option c is incorrect because manual adjustment during performances disrupts shows; acoustic systems need automatic not human control for seamless adaptation during live performances occurring continuously throughout.
Option d is incorrect because random processing destroys sound quality unpredictably; acoustic enhancement needs calculated not arbitrary adjustments for professional audio quality required in performance venues fundamentally.