## 5 Future Research Directions  
Despite notable progress in the development of supplementary dampers for seismic protection, several important gaps in the existing body of knowledge necessitate further exploration. These gaps encompass various dimensions of damper design, implementation, and performance assessment, underscoring the imperative for ongoing research initiatives aimed at improving the effectiveness and dependability of these systems. A particularly critical area for further inquiry is the long-term performance and deterioration of damping devices when subjected to diverse environmental conditions. [PERSON] and [PERSON] [149] assert that, while existing design approaches partially address these interactions, there is a pressing need for more advanced models capable of accurately forecasting the coupled behavior of dampers and structural components during intense seismic activity. This gap in understanding is particularly critical when considering the likelihood of nonlinear responses and damage accumulation in both the dampers and the primary structure. The efficacy of supplementary dampers in multi-hazard contexts constitutes a significant area of research that remains underexplored. According to [PERSON] et al. [150], although these dampers are primarily engineered for seismic mitigation, their effects on structural performance during other extreme conditions, such as severe wind events or explosive forces, are not yet thoroughly comprehended. It is crucial to cultivate a holistic understanding of damper functionality across various hazard scenarios to refine their design and guarantee their operational effectiveness in a range of environmental challenges. Additionally, there exists a considerable deficiency in the existing literature concerning the incorporation of smart materials and adaptive control mechanisms within supplementary damping systems. [PERSON] et al. [151] emphasized the promise of self-sensing and self-adjusting dampers that can modify their characteristics in real time in response to external stimuli. Nevertheless, the advancement and practical application of such sophisticated systems remain nascent, highlighting the need for further investigation to unlock their complete potential in bolstering structural resilience. In recent years, the development of innovative seismic protection systems has gained momentum, with particular emphasis on the seesaw system due to its distinctive method of controlling structural responses [152; 153; 154]. This system utilizes dampers and cables arranged in a manner that emulates the motion of a seesaw, thereby facilitating improved energy dissipation during seismic activities [155; 156]. The seesaw mechanism is characterized by a central pivot point, upon which the structure is effectively balanced. As mentioned by [PERSON] et al. [157; 158], dampers are strategically positioned at the extremities of the seesaw arms, while cables contribute to additional stability and control. In the event of an earthquake, the seesaw motion engages the dampers, which dissipate seismic energy through various mechanisms, including viscous fluid displacement and friction. Concurrently, the cables serve to restrict excessive displacements and provide a restorative force to the structure [159]. This collaborative interaction among the seesaw motion, dampers, and cables leads to a more regulated structural response, potentially mitigating both inter-story drifts and accelerations [160]. The efficacy of the seesaw system has been validated through numerical simulations and experimental investigations, indicating its potential for application in both new constructions and the retrofitting of existing buildings. Nonetheless, additional research is essential to refine the system's parameters, including damper specifications, cable pretension, and seesaw geometry, to enhance its performance across a diverse array of seismic conditions [161; 162].