Junsang Park

Seock-Hwan Noh, Junsang Park, Dahoon Park et al.

When training early-stage deep neural networks (DNNs), generating intermediate features via convolution or linear layers occupied most of the execution time. Accordingly, extensive research has been done to reduce the computational burden of the convolution or linear layers. In recent mobile-friendly DNNs, however, the relative number of operations involved in processing these layers has significantly reduced. As a result, the proportion of the execution time of other layers, such as batch normalization layers, has increased. Thus, in this work, we conduct a detailed analysis of the batch normalization layer to efficiently reduce the runtime overhead in the batch normalization process. Backed up by the thorough analysis, we present an extremely efficient batch normalization, named LightNorm, and its associated hardware module. In more detail, we fuse three approximation techniques that are i) low bit-precision, ii) range batch normalization, and iii) block floating point. All these approximate techniques are carefully utilized not only to maintain the statistics of intermediate feature maps, but also to minimize the off-chip memory accesses. By using the proposed LightNorm hardware, we can achieve significant area and energy savings during the DNN training without hurting the training accuracy. This makes the proposed hardware a great candidate for the on-device training.

Junsang Park, Sarah Brown, David L. Vogel et al.

As generative artificial intelligence (GAI) enters the mental health landscape, questions arise about how individuals weigh AI tools against human therapists. This study examined belief-based predictors of intention to use GAI and therapists across two populations: a university sample (N = 1,155) and a nationally representative adult sample (N = 651). Using paired-sample t-tests following a MANOVA, we found that human therapists were viewed as providing greater emotional support and coping, relationship, and educational skills as well as being able to personalize treatment than GAI chatbots. In turn, GAI support was viewed as being more affordable and accessible. No differences between modalities were found with concerns about privacy, reliability, stigma, mental health literacy or help-seeking norms. Using LASSO regression, we examined how beliefs about each modality jointly shape help-seeking intentions. Across both samples, intentions to use either GAI or human therapists were most strongly associated with perceptions of interpersonal support, including emotional support, relational guidance, and personalization. Barriers differed across modalities: concerns about privacy and reliability were more strongly associated with reduced intention to use GAI, whereas structural constraints, particularly affordability, were more closely linked to human therapy use. These findings extend the Health Belief Model to a dual-modality context, demonstrating that help-seeking decisions reflect a comparative push-pull process in which barriers to one modality redirect users toward the other. Design implications are discussed for developing trustworthy, emotionally resonant GAI tools that complement rather than replace human care.