A5101589916- Magnetic properties of thin films
- Quantum and electron transport phenomena
- Advanced Memory and Neural Computing
- Advancements in Semiconductor Devices and Circuit Design
- Magnetic Properties and Applications
- Organic Light-Emitting Diodes Research
- Molecular Junctions and Nanostructures
- Innovative Human-Technology Interaction
- Organic Electronics and Photovoltaics
- Magnetic and transport properties of perovskites and related materials
- Semiconductor materials and devices
- Ferroelectric and Negative Capacitance Devices
- Context-Aware Activity Recognition Systems
- Interconnection Networks and Systems
- Graphene research and applications
- Theoretical and Computational Physics
- ICT in Developing Communities
- Force Microscopy Techniques and Applications
- Topological Materials and Phenomena
- Sensor Technology and Measurement Systems
- Green IT and Sustainability
- Mobile Learning in Education
- Business Process Modeling and Analysis
- Electronic and Structural Properties of Oxides
- Service-Oriented Architecture and Web Services
Gachon University
2025
Kyung Hee University
2015-2024
Instituto de Investigaciones Químicas
2024
Kyoto University
2024
Kyoto University Institute for Chemical Research
2024
National Institute of Standards and Technology
2011-2020
Theiss Research
2016-2020
Western Digital (United States)
2019-2020
Samsung (South Korea)
2002-2020
Wake Forest University
2011-2016
Proactively providing services to mobile individuals is essential for emerging ubiquitous applications. The major challenge in users with proactive lies continuously monitoring their contexts based on numerous sensors. context rich sensors imposes heavy workloads devices limited computing and battery power. We present SeeMon, a scalable energy-efficient framework sensor-rich, resource-limited environments. Running personal device, SeeMon effectively performs involving On top of multiple...
Topological insulators are unique electronic materials with insulating interiors and robust metallic surfaces. Device applications exploiting their remarkable properties have so far been hampered by the difficulty to electrically tune Fermi levels of both bulk thin film samples. Here we show experimentally that single-crystal nanowires topological insulator Bi2Se3 can be used as conduction channel in high-performance field effect transistor (FET), a basic circuit building block. Its...
Since the first observation of spin-valve effect through organic semiconductors, efforts to realize novel spintronic technologies based on semiconductors have been rapidly growing. However, a complete understanding spin-polarized carrier injection and transport in is still lacking under debate. For example, there no clear major spin-flip mechanisms role hybrid metal-organic interfaces spin injection. Recent findings suggest that single crystals can provide spin-transport media with much less...
The key feature of many emerging pervasive computing applications is to proactively provide services mobile individuals. One major challenge in providing users with proactive lies continuously monitoring users' context based on numerous sensors their PAN/BAN environments. such environments imposes heavy workloads devices and sensor nodes limited battery power. We present SeeMon, a scalable energy-efficient framework for sensor-rich, resource-limited Running personal device, SeeMon...
Evidence of spin precession and dephasing (“Hanle effect”) induced by a magnetic field is the only unequivocal proof spin-polarized conduction electron transport in semiconductor devices. However, when very strong, Hanle effect uniaxial can be impossible to measure. Using silicon device with lateral injector-detector separation over 2 mm geometrically making completely incoherent, we show experimentally theoretically that still measured using two-axis field.
Using long-distance lateral devices, spin transport near the interface of Si and its native oxide (${\mathrm{SiO}}_{2}$) is studied by spin-valve measurements in an in-plane magnetic field precession a perpendicular at 60 K. As electrons are attracted to electrostatic gate, we observe shorter average transit times increase coherence, despite reduction total polarization. This behavior, which contrast with expected exponential depolarization seen bulk explained using transform method recover...
We developed Exertainer, a sensor-enabled, interactive running entertainment system to support advanced exercise applications. designed Exertainer be used in urban environments where outdoor is often not convenient or practical; as such, and applications represent an attractive alternative traditional treadmill running. effectively creates robust design space around Developers can leverage Exertainer's components, called Interactive Treadmill, Sensor Bracelet the PSD game platform, immersive...
Loaded with personal data, e.g. photos, contacts, and call history, mobile phones are truly devices. Yet it is often necessary or desirable to share our others. This especially true as integrating features conventionally provided by other dedicated devices, from MP3 players games consoles. Unfortunately, when we lend others, give away complete access because existing assume a single user provide little protection for private data applications. In this work, present xShare, solution address...
We envision that diverse social exercising games, or exergames, will emerge, featuring much richer interactivity with immersive game play experiences. Further, the recent advances of mobile devices and wireless networking make such engagement more pervasive - people carry portable exergame (e.g., jump ropes) interact remote users anytime, anywhere. Towards this goal, we explore potential using heterogeneous exercise as controllers for a multi-player exergame; e.g., playing boat paddling two...
The design of a magneto-optical microscope magnetometer (MOMM) for simultaneously probing local magnetic properties is described. MOMM consists an optical polarizing capable contrast that used as by sweeping field from electromagnet. Due to full-field imaging, opposed single photodiode detection, the system simultaneous measurement hysteresis loops and magnetization viscosity curves on 8000 individual regions 400×400 nm2 area in ferromagnetic materials. most striking feature it provides...
A kindergarten is an interesting community of young children. The children continuously share their interactions and experiences, grow along similar developmental stages. In this setting, studying relative differences among them can be approach to investigating how help individual social development. study, we present our intuition on inter-child behavioral relativity apply it a real environment. We conduct close user study necessitating the monitoring children's behavior. Then, utilizing...
Organic semiconductors hold immense promise for the development of a wide range innovative devices with their excellent electronic and manufacturing characteristics. Of particular interest are nonmagnetic organic that show unusual magnetic field effects (MFEs) at small subtesla strength can result in substantial changes optoelectronic properties. These unique phenomena provide tremendous opportunity to significantly impact functionality organic-based may enable disruptive spintronic...
We present the observation of magnetoresistance in Co/Ca/Alq3/Ca/NiFe spin-valve devices. Thin Ca layers contacting 150 nm thick Alq3 enable injection spin-polarized electrons into due to engineering band alignment. The devices exhibit symmetric current-voltage (I–V) characteristics indicating identical metal contacts on Alq3, and up 4% positive was observed at 4.5 K. In contrast, simultaneously fabricated Co/Alq3/NiFe displayed asymmetric I–V curves different electrodes, effects were not observed.
We report on electron spin transport through electrochemically precipitated copper filaments formed in TaOx memristive devices consisting of Co/TaOx/Cu/Py with crossbar-type electrode geometry. The show behavior having a typical OFF/ON resistance ratio 105. Magnetoresistance measurements performed by sweeping an external magnetic field clearly indicate nano-filament as long 16 nm the ON-state at 77 K. Spin vanishes OFF-state. These data are strong evidence that fundamental switching...
On school field trips, chaperoning teachers' foremost concern is the safety of children, particularly ensuring that none them go missing. However, they have limited attention resources and face many challenges in keeping track their charges. We present RubberBand, an assistive application helps alleviate teacher's burden. Our approach adapts to diverse trip environmental child behavioral dynamicity, utilizing observations relative dispersion children tendency form sub-groups.
This paper discusses the problem of connectivity binding with geometric costs and a binder (GB) built to solve it. The goal GB is produce bindings short interconnection lengths. important because routing can account for significant portion layout area long communication lines tend lead longer cycle times due increased capacitance. Long also increase power consumption, so it decrease lengths low-power designs. issue becomes even more critical as feature sizes are reduced. uses new grid-based...