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Park, Dong Yoon,Chang, Seongju SAGE Publications 2014 Indoor and Built Environment Vol.23 No.7
<P>This study analyses the performance characteristics of combined variable ceiling and floor-based air distribution systems in an office room using a numerical method to optimize the level of thermal comfort and indoor air quality. To validate the computational fluid dynamics simulations, temperature, air velocity and CO<SUB>2</SUB> concentration were measured and compared. The simulation results of various combinations of ceiling and floor-based air distribution systems show that the exhaust should be located above the occupant and the window in summer; due to the large thermal plume as heat sources that could be generated by the window and the occupant. Whereas in winter, the supply should be located on the ceiling far from the window and the exhaust should be positioned on the floor near the occupant; as the downward airflow around the cold window surface would become more dominant when compared to the upward airflow associated with any other heat sources. The results have indicated that having both ceiling and floor-based air conditioning systems would allow the flexibility to change supply and exhaust air diffuser locations to optimize thermal and ventilation performance more efficiently in countries that are subject to distinct seasonal changes.</P>
ROHINI : A Robotic Flower System for Intuitive Smart Home Interface
Seongju Chang,Sungil Ham,Dongjun Suh 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
ROHINI is a humanoid type flower robot that mediates interactions between occupants and various devices and equipments embedded in a smart home environment. Traditional interfaces such as remote controllers, switches or buttons at home lack of intuitive and natural interactions needed to provide a highly sophisticated monitoring and control of various smart home operations. ROHINI, a rose-like anthropomorphic robot is equipped with biometric sensing system(voice recognition), flower bud and stem motion control systems as well as voice synthesis and color change actuation mechanism to respond to both occupants’ and environmental demands. ROHINI can listen to the user’s voice to recognize verbal command or question and then respond to it based on simple embedded conversational rules. ROHINI also could open or close its rose petals, change its flower bud color through embedded LED, bends its stem at each joint that has step motors and rotate clockwise or counter-clockwise through its rotating base panel. ROHINI has high potential to be a one of the unique robotic home service interface through which a user or group of users could monitor real time context of a smart home and control various indoor devices which constitute smart home environment.
PIMA: RFID and USN based Personalized Indoor Microclimate Adjuster
Seongju Chang,Chulmin Kim,Dongjun Suh 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
Everyone has physiological preference regarding micro-climate conditions such as temperature, humidity and illumination, therefore, personalized micro-climate control could certainly enhance human comfort level in building interior space. 25% of the total national energy consumption is related with buildings, so reducing building operation energy is also necessary. Consequently, innovative sensing technologies such as RFID (Radio Frequency Identification) and USN (Ubiquitous Sensor Network) are adopted to increase occupants’ comfort level and to save energy for controlling both hygrothermal and visual environment in a building. This research explored how sensing technology could support a personalized indoor microclimate control to comfortably adapt physical environment to the identified occupant’s preference. As the first step, we designed a simple automated environmental control system with home appliances such as heater, humidifier and lamp along with RFID and USN for sensing both occupants and environment. This RFID and USN based personalized indoor microclimate regulator uses multi-threshold scheme not to give an abrupt start or stop of home appliances and will possess learned preference recommendation capability to evolve its personal preference database according to the user’s manual override behaviors observed from the system operations.
액티브 에이징 지원형 공동주택 주호설계를 위한 예비 고령층 및 고령층 생활패턴과 선호주거공간특성 연구
장성주(Chang, Seongju),손준태(Son, Juntae),박한샘(Park, Hansaem) 대한건축학회 2017 대한건축학회논문집 Vol.33 No.1
This study explored demographic characteristics based everyday lifestyle patterns and preferred spatial requirements of potential collective housing residents in Korea who would pursue ‘Ambient Assisted Living’ with ‘Aging In Place’ initiatives. Online questionnaire survey was commissioned for the pre-elderly and elderly age groups of 40s, 50s and above 60s, 801 individuals in total. Survey participants were asked to select 3 most preferred answers among 5 with ranked priority to clearly capture each testee’s true priority choices over 50 carefully designed questions in relation with promoting healthcare sensitive residential spaces. Comprehensive analysis was carried out by processing the survey results with cross-tabulation analysis. The outcome showed fairy unanimous preference patterns across majority of the questions regardless of gender, age, and economic status differences. Formation of separate and independent household, relatively spacious living room, possible layout alteration after moving into a residence, non-slippery bathroom floor, bio-medic sensor embedded chair or sofa were identified as those commonly preferred requirements of physical space design for an household. Some subject groups such as female and age group of over 60s show similar preference profile in the sense that both groups prefer living in the same collective residence when they are aged, cooking ordor ventilating kitchen, bed with storage below, ventilation for kitchen and bathroom. This implies certain demographic groups share their residential preference when aging is in progress. Differentiated residential preference profiles among different demographic groups were also identified. For instance, male, age groups of 50s and over 60s, low-income group prefer living in a same household whereas female, age group of 40s and high-income group turn out to prefer living in a separate household in the same collective housing complex when they are aged. While most of testees prefer garden farming for their apartment veranda, age group of 40s and high-income group express their preference of using veranda as a resting place. Comprehensive analysis on those preference profiles across major demographic classification was summarized in table format focused on healthcare sensitive household unit design. This study is a pioneering attempt to identify a set of preferred health-sensitive lifestyles and residential space requirements to be insightful for planning and designing ‘active aging in place’ supportive collective housing household units in Korean context.
Exploratory Methodology for Acquiring Architectural Plans Based on Spatial Graph Similarity
Ham, Sungil,Chang, Seongju,Suh, Dongjun,Narangerel, Amartuvshin Architectural Institute of Korea 2015 Architectural research Vol.17 No.2
In architectural planning, previous cases of similar spatial program provide important data for architectural design. Case-based reasoning (CBR) paradigm in the field of architectural design is closely related to the designing behavior of a planner who makes use of similar architectural designs and spatial programs in the past. In CBR, spatial graph can be constituted with most fundamental data, which can provide a method of searching spatial program by using visual graphs. This study developed a system for CBR that can analyze the similarity through graph comparison and search for buildings. This is an integrated system that is able to compare space similarity of different buildings and analyze their types, in addition to the analysis on a space within a single structure.
RFID Assisted Image Annotation System for A Portable Digital Camera
Hyunseok Kim,Seongju Chang 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
As for our newly developed smart camera system, a RFID reader is integrated into a digital camera for recognizing user (Who), place (Where) and object (What) that are associated with an image. When an author’s RFID tag is detected after the camera system is turned on, corresponding EPC code compliant user information is obtained to perform authentication. All images taken after this would be stored with this attribute indicating the creator of the images. In case other person’s RFID tag is detected afterwards, the system recognizes it as the target object that is to be taken into an image. If the detected RFID tag is related to a place, the system records it as the location context. In case GPS is activated at the location, the GPS reading is stored in geotagging format. Unlike computer vision based image annotation process, this new approach could support various geography sensitive imaging services such as an effective image searching on a typical PC. Such a RFID assisted image annotation system enables a highly efficient image classification, archival and retrieval.