Institution profile

Dwarkadas J. Sanghvi College of Engineering

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Research library7linked papers
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Selected work

Representative Papers

Advanced Encryption Technique for Multimedia Data Using Sudoku-Based Algorithms for Enhanced Security

Jan 15, 2026

This work proposes a unified block cipher framework based on Sudoku puzzles to address the vulnerability of multimedia data during transmission and the limitations of conventional encryption methods in achieving both robust security and multimodal compatibility. For the first time, a timestamp-driven dynamic key mechanism is integrated into the Sudoku-based encryption scheme, enabling efficient and secure encryption of images, audio, and video within a single architecture. The approach combines Sudoku permutation with XOR substitution to form a lightweight block cipher. Experimental results demonstrate that the proposed method achieves near-perfect NPCR (close to 100%) for image encryption and an SNR exceeding 60 dB for audio encryption, significantly enhancing resistance against brute-force and differential attacks.

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Color, Sentiment, and Structure: A Comparative Study of Instagram Marketing Across Economies

Dec 20, 2025

This study investigates how aesthetic features (dominant hue, textual sentiment) and structural macroeconomic variables (GDP, population, obesity prevalence) jointly shape consumer engagement with global food brands on Instagram, and how these effects vary across economies. Employing multimodal analysis—HSV color space extraction and VADER sentiment scoring—alongside hierarchical regression modeling, it is the first to systematically integrate visual, linguistic, and macro-level predictors. Results reveal distinct cross-national patterns: in developing economies, beige–green palettes correlate with higher engagement, and GDP positively predicts interaction; in developed economies, population size enhances engagement, whereas GDP negatively moderates attention. Obesity prevalence exhibits significant regional heterogeneity in its effect on likes and comments. The findings uncover nonlinear and directionally opposing moderation effects, advancing theoretical understanding of digital marketing localization and offering empirically grounded guidance for region-specific campaign design.

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Systematic Optimization of Open Source Large Language Models for Mathematical Reasoning

Sep 08, 2025

This study addresses the low efficiency and unstable performance of open-source large language models (LLMs) on mathematical reasoning tasks. We propose the first cross-architecture, systematic parameter optimization framework, jointly tuning temperature (0.1–0.5), reasoning steps (4–12), planning cycles (1–4), and nucleus sampling threshold (0.85–0.98), while incorporating stochasticity control and dynamic depth adjustment. The framework achieves 100% optimization success across five state-of-the-art models: Qwen2.5-72B, Llama-3.1-70B, DeepSeek-V3, Mixtral-8x22B, and Yi-Lightning. Experiments demonstrate an average 29.4% reduction in computational cost, a 23.9% increase in inference speed, a 98% accuracy for DeepSeek-V3, and peak token efficiency for Mixtral-8x22B (361.5 tokens per correct response). The work establishes a reusable, standardized optimization paradigm and plug-and-play configuration protocol, providing both theoretical foundations and practical engineering guidance for efficient LLM deployment in mathematical reasoning.

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Optimizing Multilingual Text-To-Speech with Accents&Emotions

Jun 19, 2025

To address accent distortion, emotional incoherence, and insufficient cultural adaptation in text-to-speech (TTS) systems for Hindi and Indian English synthesis within South Asia’s multilingual context, this work proposes the first accent–emotion disentangled architecture. Our method integrates a language-specific phoneme-aligned hybrid encoder-decoder with residual vector-quantized accent encoding, enabling real-time cross-lingual accent switching (e.g., “Namaste, let’s talk about”) and culture-aware emotional embedding. Building upon Parler-TTS, we train a culturally sensitive emotion layer and a dynamic accent code switching module on native speech corpora. Experiments demonstrate a 23.7% improvement in accent accuracy (WER reduced from 15.4% to 11.8%), 85.3% native speaker emotion recognition accuracy, and a cultural correctness MOS of 4.2/5 (p < 0.01), significantly outperforming METTS and VECL-TTS.

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Recent publications

Latest Papers

Advanced Encryption Technique for Multimedia Data Using Sudoku-Based Algorithms for Enhanced Security

Jan 15, 2026

This work proposes a unified block cipher framework based on Sudoku puzzles to address the vulnerability of multimedia data during transmission and the limitations of conventional encryption methods in achieving both robust security and multimodal compatibility. For the first time, a timestamp-driven dynamic key mechanism is integrated into the Sudoku-based encryption scheme, enabling efficient and secure encryption of images, audio, and video within a single architecture. The approach combines Sudoku permutation with XOR substitution to form a lightweight block cipher. Experimental results demonstrate that the proposed method achieves near-perfect NPCR (close to 100%) for image encryption and an SNR exceeding 60 dB for audio encryption, significantly enhancing resistance against brute-force and differential attacks.

0 citationsRead paper

Color, Sentiment, and Structure: A Comparative Study of Instagram Marketing Across Economies

Dec 20, 2025

This study investigates how aesthetic features (dominant hue, textual sentiment) and structural macroeconomic variables (GDP, population, obesity prevalence) jointly shape consumer engagement with global food brands on Instagram, and how these effects vary across economies. Employing multimodal analysis—HSV color space extraction and VADER sentiment scoring—alongside hierarchical regression modeling, it is the first to systematically integrate visual, linguistic, and macro-level predictors. Results reveal distinct cross-national patterns: in developing economies, beige–green palettes correlate with higher engagement, and GDP positively predicts interaction; in developed economies, population size enhances engagement, whereas GDP negatively moderates attention. Obesity prevalence exhibits significant regional heterogeneity in its effect on likes and comments. The findings uncover nonlinear and directionally opposing moderation effects, advancing theoretical understanding of digital marketing localization and offering empirically grounded guidance for region-specific campaign design.

0 citationsRead paper

Systematic Optimization of Open Source Large Language Models for Mathematical Reasoning

Sep 08, 2025

This study addresses the low efficiency and unstable performance of open-source large language models (LLMs) on mathematical reasoning tasks. We propose the first cross-architecture, systematic parameter optimization framework, jointly tuning temperature (0.1–0.5), reasoning steps (4–12), planning cycles (1–4), and nucleus sampling threshold (0.85–0.98), while incorporating stochasticity control and dynamic depth adjustment. The framework achieves 100% optimization success across five state-of-the-art models: Qwen2.5-72B, Llama-3.1-70B, DeepSeek-V3, Mixtral-8x22B, and Yi-Lightning. Experiments demonstrate an average 29.4% reduction in computational cost, a 23.9% increase in inference speed, a 98% accuracy for DeepSeek-V3, and peak token efficiency for Mixtral-8x22B (361.5 tokens per correct response). The work establishes a reusable, standardized optimization paradigm and plug-and-play configuration protocol, providing both theoretical foundations and practical engineering guidance for efficient LLM deployment in mathematical reasoning.

0 citationsRead paper

Optimizing Multilingual Text-To-Speech with Accents&Emotions

Jun 19, 2025

To address accent distortion, emotional incoherence, and insufficient cultural adaptation in text-to-speech (TTS) systems for Hindi and Indian English synthesis within South Asia’s multilingual context, this work proposes the first accent–emotion disentangled architecture. Our method integrates a language-specific phoneme-aligned hybrid encoder-decoder with residual vector-quantized accent encoding, enabling real-time cross-lingual accent switching (e.g., “Namaste, let’s talk about”) and culture-aware emotional embedding. Building upon Parler-TTS, we train a culturally sensitive emotion layer and a dynamic accent code switching module on native speech corpora. Experiments demonstrate a 23.7% improvement in accent accuracy (WER reduced from 15.4% to 11.8%), 85.3% native speaker emotion recognition accuracy, and a cultural correctness MOS of 4.2/5 (p < 0.01), significantly outperforming METTS and VECL-TTS.

0 citationsRead paper