Ju-Whan Kim

The ténéré: design for supporting energy conservation behaviors

We present the Ténéré, electric power extension cords, designed to support peoples energy conservation behaviors. The focus of design solutions was to provide appropriate energy awareness information in meaningful and emotional ways while products are being used. A narrative of tree was used to indicate energy use. The Tree of Tenere was the most isolated tree in the world. The tree is dead now and replace by a tree-like sculpture. It symbolizes the environmental consequences of human activity. When users overuse electricity, the graphics of the tree is transformed to the sculpture. This interactive graphics on the product encourages sustainable behaviors. Users are expected to be impressed and change their energy behaviors. Also we verified narrative-embedding approach is considerable method for industrial design field.

Formation mechanism of crystallites in the as-deposited mixed-phase low pressure chemical vapor deposition silicon thin films

Transmission electron microscopy study on the microstructure of silicon thin films, deposited at temperature ranges of 565 °C∼600 °C and at 200 mTorr by low pressure chemical vapor deposition and annealed at 570 °C, was carried out so that the formation mechanism of crystallites observed in as‐deposited mixed‐phase silicon thin films could be proposed. Crystallites were observed only at the Si/SiO2 interface in the as‐deposited silicon thin film deposited at 570 °C for 28 min. Their size was about 20 nm and they had an irregular shape. Areal density of crystallites in the as‐deposited film was about 4 × 1010/cm2, but that in the film deposited as an amorphous phase and annealed at 570 °C for 2 h was about 2×109/cm2. No remarkable crystal growth occurred in the film deposited at 570 °C for 28 min and then annealed at 570 °C for 1 h. Two kinds of crystallites were observed in the film annealed at 570 °C for 3 h. The first, observed only at the Si/SiO2 interface, had an irregular shape, and the second, grown...

MoleBot: mole in a table

What would it be like to have a mole live under your table and push around objects on the table surface? We have developed MoleBot, a robotic mole living in a coffee table that interacts with small items laid on the table surface. The MoleBot projects a molehill on the surface, which moves simultaneously with the movement of the MoleBot. In order to make the molehill move with fluidity, the table surface needs to be rigid yet flexible. Various techniques used in shape display and organic user interfaces of previous projects (Feelex, Pop Up!, Lumen1, Relief2, and HypoSurface) were assessed to determine the feasibility of the molehill idea. The projects adopted servo motors, shape memory alloys, electric slide potentiometers, and pneumatic actuators. However, in generating the MoleBot, these techniques were unable to concurrently provide the necessary speed of actuation, resolution, and pixel size for desired level of physical interactivity with objects on the surface. As a result, we conceived a new way to implement this concept.

MoleBot: a robotic creature based on physical transformability

What would it be like to have a mole live under your table and push around objects on the table surface? We developed MoleBot, a robotic creature based on an Organic User Interface (OUI) that lives in a coffee table and interacts with small items placed on the table surface. To ensure fluid motions of the molehill cast by the MoleBot, the table surface combines its horizontal rigidity with the vertical flexibility of movable pins. The users are enabled to kinetically interact with this creature via a joystick or gestural commands.

M.Sketch: Prototyping Tool for Linkage-Based Mechanism Design

We present M.Sketch, a prototyping tool to support non-experts to design and build linkage-based mechanism prototype. It enables users to draw and simulate arbitrary mechanisms as well as to make physical prototype for testing actual movement. Mix of bottom-up and top-down sketching approaches, real-time movement visualization, and functions for digital fabrication can make the users to design the desired mechanism easily and effectively. M.Sketch can be used to design customized products with kinetic movement, such as interactive robot, toys, and sculptures.

Phase diagram of pseudobinary Pb(Yb1/2Nb1/2)O3-Pb(Sc1/2Nb1/2)O3 ceramic solid solution

Crystal structure and dielectric properties of (1−x)Pb(Yb1∕2Nb1∕2)O3−xPb(Sc1∕2Nb1∕2)O3 (PYN1−xPSNx) (0⩽x⩽0.60) solid solution have been studied, and its pseudobinary phase diagram has been determined. The low-temperature crystal structure of PYN1−xPSNx becomes pseudocubic from the PYN’s orthothombic with increasing x. Also the x-ray diffraction line intensities ascribed, respectively, to the antiferroelectric (AFE) lattice modulation and the B-site ordering become gradually weaker and then they disappear altogether for x>0.37. In the PYN-rich composition range (0⩽x<0.37), the paraelectric (PE)-AFE phase transition occurs sharply and its transition temperature remains independent of the applied frequency. However, on further increasing Sc concentration (0.37<x⩽0.60), the dielectric constant versus temperature curve becomes gradually broader and displays a frequency-dependent ferroelectric (FE) relaxor behavior. Particularly near x=0.37, the frequency-dependent dielectric behavior near the dielectric maximu...

TRANSMISSION ELECTRON MICROSCOPY STUDY OF SIF+/BF2+ IMPLANTED AND ANNEALED(100)SI : AMORPHIZATION AND RESIDUAL EFFECTS

Formation of amorphous layers and residual defects in SiF+/BF2+ implanted and annealed (100)Si was investigated on an atomic level by using a high‐resolution transmission electron microscope. Amorphous layers, of which depths were about 70% of those of amorphous layers formed by Si+ preamorphization at the same implantation energies, could be formed by SiF+ preamorphization. Two distinct layers of defects were formed in SiF+/BF2+ implanted wafers annealed at 600 °C for 1 h and then rapidly thermally annealed at 950 °C for 30 s. One layer, observed near the surface regions, consisted of intrinsic stacking faults bounded by 30° Shockley partial dislocations, twins, amorphous regions, and fine clusters. The other layer, observed near the original amorphous/crystalline interface, consisted of Frank partial dislocations of which Burgers vector is 1/3a〈111〉 and 60° perfect dislocations of which Burgers vector is 1/2a〈110〉. These defects were formed by retarding growth rate by fluorine atoms; outdiffusion of flu...

'MoleBot': An Organic User-Interface-Based Robot That Provides Users with Richer Kinetic Interactions

We introduce a new type of organic user interface that displays a 3D robotic creature, ‘MoleBot’ to provide a ludic experience inspired by traditional board games. To ensure fluid motions of the molehills cast by the ‘MoleBot’, the table surface combines horizontal rigidity with the vertical flexibility of over 15,000 movable pins. Users are enabled to kinetically interact with this creature via a joystick or gestural commands. We conducted user study sessions with 12 participants and classified the observed spontaneous play activities into 4 distinct categories: (1) enjoying simple ludic experience, (2) competing in skills, (3) mimicking realworld sports and (4) playing with a companion. In addition, a focusgroup interview with six video scenarios was conducted to explore the idea of potential applications and it was suggested that the ‘MoleBot’ can be used in interactive boardgaming environments and kinetically informative tabletops.

M-gesture: geometric gesture authoring framework for multi-device gestures using wearable devices

Wearable devices and mobile devices have great potential to detect various body motions as they are attached to different body parts. We present M-Gesture, a geometric gesture authoring framework using multiple wearable devices. We implemented physical metaphor, geometric gesture language, and continuity in spatial layout for easy and clear gesture authoring. M-Gesture demonstrates the use of geometric notation as an intuitive gesture language.