Abstract: An apparatus for estimating biological information may include a sensor configured to detect a first light signal and a second light signal from an object of a user and a processor configured to determine whether a condition for estimating biological information is satisfied based on the detected first light signal and estimate biological information based on the second light signal, wherein the sensor includes a force sensor configured to measure a force applied to the object when the object is in contact with a cover surface of the sensor.

Abstract: The present disclosure relates to power receiving devices and methods. An example power receiving device comprises an antenna cell array configured to receive a radio frequency (RF) signal from a transmission device, where the antenna cell array includes a first antenna cell and a second antenna cell, a first rectifier connected to the first antenna cell and having first maximum rectification efficiency when an input signal of the first rectifier has a first power value, a second rectifier connected to the second antenna cell and having second maximum rectification efficiency when an input signal of the second rectifier has a second power value different from the first power value, a first voltage converter configured to perform a first conversion of an output of the first rectifier, and a second voltage converter configured to perform a second conversion of an output of the second rectifier.

Abstract: A secondary battery includes a cylindrical can, an electrode assembly in the cylindrical can together with an electrolytic solution, and a cap assembly coupled to the top of the cylindrical can, the cap assembly including a cap-up including a cap-up circumference flat portion and a cap-up circumference bent portion bent from the cap-up circumference flat portion in a downward direction and a safety plate coupled to the cap-up circumference flat portion and the cap-up circumference bent portion.

Abstract: The present invention relates to polyether amino acid ester compounds, preparation method and their use as hydrocarbon fuel additives.

Abstract: An ester compound is prepared with a greatly improved efficiency by reacting a liquid alcohol with a liquid organic acid at a temperature of about 30 to 70.degree. C. in the presence of a lipase without adding any solvent. In particular, short chain acids and alcohols are reacted with lipase from candida antarctica immobilized on an acrylic resin.

Abstract: A plastic composition superior in both biodegradability and physical properties, comprises a matrix resin which is a blend of polyethylene and a biodegradable aliphatic polyester, starch, a coupling agent, a radical initiator, a starch plasticizer, a starch destructurizing agent and an autooxidizing agent, wherein the starch chemically binds to the matrix resin.

Abstract: A thermoplastic elastomeric composition, which comprises liquid 1,2-polybutadiene, EPDM rubber, a polyolefin resin, a curative system consisting of phenolic resin and peroxide, and a co-curing agent, the 1,2-polybutadiene and EPDM rubber being at least partially cured, shows well-balanced various properties including physical properties, elasticity and thermal resistance in addition to being superior in oil resistance at high temperatures and processability.