## 1 Introduction  
The existing patient-specific treatment device field is not as active as expected because of insufficiencies in the service ecosystem and structural limitations in the service operation at the independent application level. Therefore, it is necessary to combine biotechnology with information and communication technology (ICT), both of which are strong technologies in South Korea, to establish an ecosystem in the field of patient-specific treatment devices, such as the newly developed motion-analysis system. Figure 1 shows that the global market for digital therapy reached USD 3.23 billion in 2021 from USD 2.7 billion in 2020. It is expected to reach USD 4.66 billion by 2023 and USD 17.34 billion by 2030. The compound annual growth rate (CAGR) for the digital therapy market is 20.5%, which is significantly higher than that of the general pharmaceutical market. However, the digital therapy market has different forecasts for each institution. As a result, there are limitations in predicting the exact market size or growth rate. This technology, which combinesinformation technology with existing medical and pharmaceutical technologies, is considered an alternative tool for overcoming the limitations of existing medical treatments; therefore, its market growth rate is significantly higher than that of the existing medical industry market [1]. In particular, the patient-specific treatment device market is expected to reach approximately USD 4.2 billion by 2021, with a CAGR of 26.1% from 2022 to 2030, because of increased demand for cost-effective digital health technology, integrated medical systems, and patient-centered care for patients in developed and developing countries. To solve medical accessibility problems such as those for degenerative brain diseases, mental diseases, and psychological (mental) disorders caused by aging, it is necessary to establish a patient-specific medical service demonstration and support system, such as a motion-analysis system. Therefore, multi-disciplinary research and development projects are needed to demonstrate patient-specific treatment devices. This is an urgent time for international exchanges because they must lay a foundation that cannot be accessed at the private level [2]. Human motion-analysis technology can be expanded to various smart healthcare areas; therefore, it can be widely used for healthcare for the elderly who are living alone, emergency medical system linkage after sustaining fall injuries, smart exercise coaching, joint function self-evaluation, physical vitality index, and daily life activity level evaluation. Furthermore, owing to the development of the internet of things and ICT such as patient-specific medical services, artificial intelligence, and big data, the need to foster a patient-specific medical industry via the commercialization of patient-specific treatment devices is emerging. Quantitative measurements or evaluations of muscle strength and body composition (body fat) in the field of healthcare have focused only on physical fitness tests. However, the digital health industry, which is the mainstay of the fourth industrial revolution era, has grown rapidly. Measuring devices for movement and posture that are related to musculoskeletal dysfunction are being developed for use in a more convenient manner, and the importance of their evaluation is highly recognized. Several overseas experts are conducting different studies to analyze the asymmetric movement and posture of the human body by using the latest technologies and equipment to alleviate pain and reduce the risk of injury [3]. However, in the field of rehabilitation, most are focused on intervention and the qualitative evaluation of experts (humans). Commonly used motion-analysis systems, such as VICON systems, are highly reliable for research and analysis; however, they can be difficult to operate depending on the situation because they are expensive (particularly with regard to spatiotemporal constraints).