Background: YouTube, known as an online video platform, is one of the most popular and dynamic video platforms in the world. it provides access to videos with a variety of content, both in health and many other areas. The fact that it is accessible to everyone and free of charge makes it frequently preferred by individuals. The effectiveness of social media platforms on the thoughts and behaviors of individuals has caused YouTube and other similar platforms to be the subject of health research in recent years. Agoraphobia is an anxiety disorder characterized by an intense fear of feeling trapped somewhere. Agoraphobia is a common type of anxiety disorder in society, and cognitive behavioral and psychopharmacological agents are used in its treatment. Our aim in this research is to examine YouTube TM videos on agoraphobia in terms of reliability and quality. Methods: The first 50 videos related to agoraphobia were included in the analysis, and the duration (minutes), video content, institutions/individuals who uploaded the video, the time elapsed since uploading, total views, and likes were recorded. In addition, all videos were evaluated on two different scales: Quality Criteria for Consumer Health Information (DISCERN) and the Global Quality Scale (GQS). The obtained data were analyzed statistically. Results: The mean video duration was 11.4±9.38 minutes, the mean views count was 113299.5±333091, and the mean like count was 8512.76±31429.37. Videos were evaluated in terms of content; 50% included general information, 28% agoraphobia experience, and 22% information about overcoming agoraphobia. The GQS and DISCERN scores were significantly higher in professional videos than in non-professionals ( p <0.005). Conclusion: As a result of the evaluation of YouTube TM videos about agoraphobia in terms of quality and content, it has been determined that it is necessary to increase the rate of videos prepared by mental health professionals. Psychiatrists and other healthcare professionals working in the field of anxiety should be encouraged to provide videos with scientific and reliable content.

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This work describes how the methods of control system analysis and design can be applied to meet performance requirements of an instrument. The basic methods and steps are: mathematical modelling of the instrument, analysis of performance and stability, design modifications to provide satisfactory performance, simulation by computer to verify the design, implementing the modification into the instrument, and verification of the proposed design by tests. Nomenclature (see Fig 2) cm distance (Fig 2) (in) 4 ~ b effective area at nozzle side of booster enclosure (in2) Ac effective area of feedback bellow (in2) And effective area of sensing diaphragm (in2) A~ effective area at output side of booster enclosure (in~) h distance (Fig 2) (in) C,, capacitance of compensation ((Ibm -in2)/Ibf); see Fig 6 Cb capacitance of nozzle side of booster ((Ibm -in2)/ lbf) C~ capacitance of feedback bellow «(lbm-in2)/lbf) '~, capacitance of output enclosure of booster «(lbm-in2)/lbf) d distance (Fig 2) (in) e clearance at nozzle (in) Fd sensing diaphragm force (Ibf) F~d feedback bellow force (Ibf) Ff7 fulcrum force (1bf) F,~ spring force (lbfg distance (Fig 2) (in) k~ spring constant of feedback bellow (Ibf/in) kd sensing diaphragm spring constant (Ibf/in) ko spring constant at the output of booster (Ibf/in) ks spring constant of range spring (Ibf/in) k, valve constant for supply air (lbm/(s-in)) L distance (Fig 2) (in) I distance (Fig 2) (in) Pa a pressure of compensation (lbf/in'); see Fig 6 Pb pressure at nozzle side of booster enclosure (lbf/in2) Pc pressure of feedback bellow (Ibf/in~ 2) p, pressure of nozzle tip (Ibf/in-) po pressure at output side of booster enclosure (Ibf/ur) p, supply pressure (lbf/in') £p p i -pz pressure difference at measuring diaphragms (Ibf/in'2) R resistance of compensation (s/in'); see Fig 6 Ri resistance of compensation (s/in2); see Fig 6 R~ tubing resistance between output and feedback s/in~~R a resistance of compensation (s/in2); see Fig 6 R~, b tubing resistance between nozzle and booster (s/in2) T'1 booster relay time-constant (s); see Eqn (12) T2 feedback bellow time constant (s); see Eqn (12) 7g time constant of compensation (s); see Eqn (13) T4 time constant of compensation (s); see Eqn (13) T,, time constant of compensation (s); see Eqn (13) T~ nozzle feedback time-constant (s); see Eqn (12) x booster diaphragm displacement (in) xd motion of sensing diaphragm (in) xfd motion of feedback bellow (in) x~~, motion of fulcrum (in) xp motion of adjustment screw (in) xs displacement at range spring (in) y distance (Fig 2) (in) z distance (Fig 2) (in) Note: 51 units for corresponding imperial units Ibm, lbf, in, are kg, N, m, respectively.