永續生活已經成為世界的趨勢，透過減少能源的使用與提高能源使用效率是達成一個永續生活重要的因素。然而能源對於民眾是抽象的資訊、無法看見和觸及的，因此即使有意願減少能源使用卻常因缺乏資訊判斷做出節能的行動選擇。以台灣為例，2009年居家用電所佔的比例約為整體用電的21%，且仍在逐年增長。將能源使用狀態以視覺呈現並設計於增加察覺的感知工具將有助使用者作出節能的判斷與行為，永續人機互動即是針對此目的所產生。能源感知工具在近年來有許多面向的發展與研究，然而節省能源有其極限，必須降低使用者持續使用能源的動機，採取新的生活態度，改變日常生活耗能的行為，才能達到永續節能的目標。

因應以上永續節能的目標，本研究提出「綠色信用」的永續人機互動概念。綠色信用本身有兩個意涵：(1)一個可以呈現使用者節省碳排放或金錢的單位，(2)對於生活環境的承諾、責任與貢獻，也就是綠色智能。本研究試圖建立以社群互動與資訊視覺化的互動模式，藉由手機作為感知工具與平台，探討節能動機的產生與行為的改變，並且建立系統原型投入到真實生活中，透過實驗觀察、問卷及訪談參與者的過程來驗證綠色信用的運作概念，以符合最終目標：建構「綠色信用」- 以視覺化的人機互動達成永續生活的目標模式的永續人機互動。本研究的具體貢獻包括：(1) 提出建構於手機上的「綠色信用」永續人機互動概念，(2) 建構資料蒐集與運算的方式，視覺化室內與室外的永續行為，(3) 建構社群互動的模式，以社群的力量，促使耗能行為的改變，(4) 以生活場域實驗，評估參與者對於永續行為的感知與改變。

In the context of sustainability, reducing energy and enhancing energy efficiency are becoming the fundamental requirement to promote sustainable living. However, the energy is abstract, invisible and untouchable. The lack of energy consumption information becomes the barrier for users who are willing to save the energy. In Taiwan, the residential sector accounts for approximately 21% in 2009, and still increasing. Thus, developing energy information and personal awareness tools for supporting decision-making are needed. The Sustainable Human-Computer Interaction is a research fields that are emerging into HCI for this purpose. Currently, a number of energy awareness tools have been developed, but energy-saving threshold did not decrease users’ energy-saving motivation. However, fostering sustainable behavior is the key for promoting the balance between resource usage and environmental impact.

This thesis aims to propose a Sustainable Human-Computer Interaction concept – “Green Credit”. The Green Credit has two implications: 1) representation of the carbon emission or money been saved by users; 2) the commitment, responsibility and contribution to sustainable environment, which could also called as Ecological intelligence. The Green Credit concept uses an interaction method coupled with social interaction and information visualization. Mobile phones are used as an awareness tool and a platform for provoking Green Credit to explore the reasons of energy-saving motivation and behavior change. In addition, a system prototype has been implement in real-life environment and conduct experiment observation, questionnaire and focus group for validating the concept of Green Credit. The contribution of this research includes: 1) Green Credit - a Sustainable Human-Computer Interaction concept, 2) the method of data collection and computation, which can visualize the in-door and outdoor sustainable behavior, 3) persuasive computing to motivate the sustainable behavior, and 4) Living Labs experiment to evaluate participants’ sustainable awareness and changing behavior.

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