VLDB 2026 Research / reviewers in the wild / expert
Janin Koch
dblp:179/5345
· DBLP profile ↗
9ranked-venue papers
4as first author
6since 2021 · last 2026
0000-0001-9207-9550ORCID · corroborated
Domains — the database's venue-derived domains; a paper can count in several
Human-computer interaction and ubiquitous computing · 8 · 3 first-author · 5 since 2021Applied, interdisciplinary, general and emerging computing · 1 · 1 first-author · 1 since 2021
| Year | Publication | Venue | Position |
|---|---|---|---|
| 2026 | DesignTrace: Exploring, Iterating and Tracking Design Alternatives with GenAIabstractCreativity support tools have begun to incorporate GenAI for exploring ideas. However, our preliminary study with nine designers showed that current GenAI tools lack explicit support for iteratively evolving, reflecting upon and tracking design alternatives. We developed DesignTrace, an early-stage GenAI design tool that allows designers to experiment with semantically relevant visual variations in an interactive design space. Its representation captures the progression of designers’ visual and semantic ideas through command histories, state tracking, and an interactive branching structure. A study of twelve professional designers shows that DesignTrace’s palette helps express, explore, and reflect on design intentions. Its interactive branching structure helps them maintain visual consistency across design iterations; remember and revisit earlier design decisions; and see connections across ideas. Our work shows how re-envisioning GenAI-based interfaces around explicit design traces enable designers to benefit from generative capabilities while maintaining control as they explore design variants. Xiaohan Peng, Debanjana Haldar, Wendy E. Mackay, Janin Koch |
CHI | 4 |
| 2025 | "Should I choose a smaller model?': Understanding ML Model Selection and Its Impact on SustainabilityabstractInternational audience Eya Ben Chaaben, Janin Koch, Wendy E. Mackay |
CHI | 2 |
| 2025 | FusAIn: Composing Generative AI Visual Prompts Using Pen-based InteractionabstractInternational audience Xiaohan Peng, Janin Koch, Wendy E. Mackay |
CHI | 2 |
| 2024 | When Should I Lead or Follow: Understanding Initiative Levels in Human-AI Collaborative GameplayabstractDynamics in Human-AI interaction should lead to more satisfying and engaging collaboration. Key open questions are how to design such interactions and the role personal goals and expectations play. We developed three AI partners of varying initiative (leader, follower, shifting) in a collaborative game called Geometry Friends. We conducted a within-subjects experiment with 60 participants to assess personal AI partner preference and performance satisfaction as well as perceived warmth and competence of AI partners. Results show that AI partners following human initiative are perceived as warmer and more collaborative. However, some participants preferred AI leaders for their independence and speed, despite being seen as less friendly. This suggests that assigning a leadership role to the AI partner may be suitable for time-sensitive scenarios. We identify design factors for developing collaborative AI agents with varying levels of initiative to create more effective human-AI teams that consider context and individual preference. Inês Lobo, Janin Koch, Jennifer Renoux, Inês Batina, Rui Prada |
Conference on Designing Interactive Systems | 2 |
| 2024 | DesignPrompt: Using Multimodal Interaction for Design Exploration with Generative AIabstractVisually oriented designers often struggle to create effective generative AI (GenAI) prompts. A preliminary study identified specific issues in composing and fine-tuning prompts, as well as needs in accurately translating intentions into rich input. We developed DesignPrompt, a moodboard tool that lets designers combine multiple modalities — images, color, text — into a single GenAI prompt and tweak the results. We ran a comparative structured observation study with 12 professional designers to better understand their intent expression, expectation alignment and transparency perception using DesignPrompt and text input GenAI. We found that multimodal prompt input encouraged designers to explore and express themselves more effectively. Designer’s interaction preferences change according to their overall sense of control over the GenAI and whether they are seeking inspiration or a specific image. Designers developed innovative uses of DesignPrompt, including developing elaborate multimodal prompts and creating a multimodal prompt pattern to maximize novelty while ensuring consistency. Xiaohan Peng, Janin Koch, Wendy E. Mackay |
Conference on Designing Interactive Systems | 2 |
| 2021 | Agency in Co-Creativity: Towards a Structured Analysis of a Concept
Janin Koch, Prashanth Thattai, Filipe Calegario |
ICCC | 1 |
| 2020 | SemanticCollage: Enriching Digital Mood Board Design with Semantic LabelsabstractDesigners create inspirational mood boards to express their design ideas visually, through collages of images and text. They find appropriate images and reflect on them as they explore emergent design concepts. After presenting the results of a participatory design workshop and a survey of professional designers, we introduce SemanticCollage, a digital mood board tool that attaches semantic labels to images by applying a state-of-the-art semantic labeling algorithm. SemanticCollage helps designers to 1) translate vague, visual ideas into search terms; 2) make better sense of and communicate their designs; while 3) not disrupting their creative flow. A structured observation with 12 professional designers demonstrated how semantic labels help designers successfully guide image search and find relevant words that articulate their abstract, visual ideas. We conclude by discussing how SemanticCollage inspires new uses of semantic labels for supporting creative practice. Janin Koch, Nicolas Taffin, Andrés Lucero, Wendy E. Mackay |
Conference on Designing Interactive Systems | 1 |
| 2020 | ImageSense: An Intelligent Collaborative Ideation Tool to Support Diverse Human-Computer PartnershipsabstractProfessional designers create mood boards to explore, visualize, and communicate hard-to-express ideas. We present ImageCascade, an intelligent, collaborative ideation tool that combines individual and shared work spaces, as well as collaboration with multiple forms of intelligent agents. In the collection phase, ImageCascade offers fluid transitions between serendipitous discovery of curated images via ImageCascade, combined text- and image-based Semantic search, and intelligent AI suggestions for finding new images. For later composition and reflection, ImageCascade provides semantic labels, generated color palettes, and multiple tag clouds to help communicate the intent of the mood board. A study of nine professional designers revealed nuances in designers' preferences for designer-led, system-led, and mixed-initiative approaches that evolve throughout the design process. We discuss the challenges in creating effective human-computer partnerships for creative activities, and suggest directions for future research. Janin Koch, Nicolas Taffin, Michel Beaudouin-Lafon, Markku Laine, Andrés Lucero, Wendy E. Mackay |
Proc. ACM Hum. Comput. Interact. | 1 |
| 2019 | May AI?: Design Ideation with Cooperative Contextual BanditsabstractDesign ideation is a prime creative activity in design. However, it is challenging to support computationally due to its quickly evolving and exploratory nature. The paper presents cooperative contextual bandits (CCB) as a machine-learning method for interactive ideation support. A CCB can learn to propose domain-relevant contributions and adapt their exploration/exploitation strategy. We developed a CCB for an interactive design ideation tool that 1) suggests inspirational and situationally relevant materials ("may AI?"); 2) explores and exploits inspirational materials with the designer; and 3) explains its suggestions to aid reflection. The application case of digital mood board design is presented, wherein visual inspirational materials are collected and curated in collages. In a controlled study, 14 of 16 professional designers preferred the CCB-augmented tool. The CCB approach holds promise for ideation activities wherein adaptive and steerable support is welcome but designers must retain full outcome control. Janin Koch, Andrés Lucero, Lena Hegemann, Antti Oulasvirta |
CHI | 1 |