Samsung

About: Samsung is a company organization based out in Seoul, South Korea. It is known for research contribution in the topics: Layer (electronics) & Signal. The organization has 134067 authors who have published 163691 publications receiving 2057505 citations. The organization is also known as: Samsung Group & Samsung chaebol.

Highly sensitive and selective hydrogen sulfide and toluene sensors using Pd functionalized WO3 nanofibers for potential diagnosis of halitosis and lung cancer

Abstract: In this work, we report a remarkably improved toluene response and superior cross-sensitivity against H 2 S molecules by combining Pd catalysts and highly porous WO 3 nanofibers (NFs). We functionalized Pd catalysts inside and/or outside of WO 3 NFs synthesized by electrospinning, which is a facile and versatile process for producing webs of metal oxide NFs. Pd-embedded WO 3 NFs were obtained by the electrospinning of a Pd and W composite precursor/poly(methyl methacrylate) (PMMA) solution followed by calcination at 700 °C. Pd nanoparticles (NPs) (6–10 nm) synthesized by a polyol method were decorated on the WO 3 NFs (Pd-NPs/WO 3 NFs) by the attachment of the Pd NPs on as-prepared WO 3 NFs. The gas sensing characteristics of pure WO 3 , Pd-embedded WO 3 , Pd-NPs/WO 3 , and Pd-NPs/Pd-embedded WO 3 NFs were tested using H 2 S and toluene gases in a highly humid atmosphere (RH 90%), which is similar to human exhaled breath. The results showed that the Pd-NPs/Pd-embedded WO 3 NFs whose inner and outer layers were decorated by Pd catalysts, exhibited a high toluene response ( R air / R gas = 5.5 at 1 ppm) and remarkable selectivity against H 2 S ( R air / R gas = 1.36 at 1 ppm) at 350 °C, whereas pristine WO 3 NFs showed superior H 2 S response ( R air / R gas = 11.1 at 1 ppm) along with a negligible response toward toluene ( R air / R gas = 1.27 at 1 ppm). The highly porous WO 3 NFs decorated with Pd catalysts, exhibited potential feasibility, i.e., a low limit of detection (LOD) of 20 ppb ( R air / R gas = 1.32) at 350 °C, for application in VOCs sensors, particularly for diagnoses of lung cancer.

Low-Temperature-Grown Transition Metal Oxide Based Storage Materials and Oxide Transistors for High-Density Non-volatile Memory

Abstract: An effective stacked memory concept utilizing all-oxide-based device components for future high-density nonvolatile stacked structure data storage is developed. GaInZnO (GIZO) thin-film transistors, grown at room temperature, are integrated with one-diode (CuO/InZnO)–one-resistor (NiO) (1D–1R) structure oxide storage node elements, fabricated at room temperature. The low growth temperatures and fabrication methods introduced in this paper allow the demonstration of a stackable memory array as well as integrated device characteristics. Benefits provided by low-temperature processes are demonstrated by fabrication of working devices over glass substrates. Here, the device characteristics of each individual component as well as the characteristics of a combined select transistor with a 1D–1R cell are reported. X-ray photoelectron spectroscopy analysis of a NiO resistance layer deposited by sputter and atomic layer deposition confirms the importance of metallic Ni content in NiO for bi-stable resistance switching. The GIZO transistor shows a field-effect mobility of 30 cm2 V−1 s−1, a Vth of +1.2 V, and a drain current on/off ratio of up to 108, while the CuO/InZnO heterojunction oxide diode has forward current densities of 2 × 104 A cm−2. Both of these materials show the performance of state-of-the-art oxide devices.

Method and mobile terminal for controlling screen lock

Abstract: A method of controlling screen lock and a mobile terminal employing the same is provided. The mobile device includes a User Interface (UI) for setting a screen unlock mode using a wireless device other than the mobile terminal and stores IDentifier (ID) information of the wireless device designated by the UI corresponding to the screen unlock mode. The mobile terminal is capable of detecting a wireless device. After the ID information of the wireless device is stored, if the wireless device is detected by the mobile terminal and ID information of the detected wireless device is identical to the stored ID information, the mobile terminal controls not to display an unlock requesting screen when the display unit of the mobile terminal is turned on.

Adaptive Step Length Estimation Algorithm Using Low-Cost MEMS Inertial Sensors

Abstract: In this paper we introduce a MEMS based pedestrian navigation system (PNS) which consists of the low cost MEMS inertial sensor. An adaptive step length estimation algorithm using the awareness of the walk or run status is presented. Future u-Health monitoring systems will be essential equipment for mobile users under the ubiquitous computing environment. It is well known that the cost of energy expenditure in human walk or run changes with the speed of movement. Also the accurate walking distance is an important factor in calculating energy expenditure in human daily life. In order to compute the walking distance precisely, the number of occurred steps has to be counted exactly and the step length should be exactly estimated as well. However the step length varies considerably with the movement's speed and status. Therefore, we recognize the movement status such as walk or run of a pedestrian using the small-sized MEMS inertial sensors. Based on the result, a step length is estimated adaptively. The developed method can be applied to PNS and health monitoring mobile system.

A random beamforming technique in MIMO systems exploiting multiuser diversity

Abstract: A random beamforming technique for multiple-input multiple-output (MIMO) systems that simultaneously obtains downlink multiuser diversity gain, spatial multiplexing gain and array gain by feeding back only effective signal-to-noise ratios (SNRs) is described. In addition, power control using waterfilling is employed to improve the throughput of our method in correlated channels. In a slow fading channel, we prove that the throughput of the proposed method converges to that of eigen beamforming when many users are in a cell. The number of users required to achieve capacity bound increases with the number of antennas and SNR was determined. However, the capacity bound is achieved even with a small number of users, e.g., 16 users in a cell, when the SNR is low, e.g., 0 dB, and the number of transmit and receive antenna is small, e.g., two. We also find that the effect of waterfilling is more noticeable in correlated channels.