Samsung Electronics Co., Ltd.

Lg Electronics Inc.

Jongyoon Choi

Hyeongseok Kim

Donghyun Kim

Dong-Sik Lee

Sungmin Hwang

Jinhyun Shin

Bongtae Park

Nayi Ryu

Sungjin Lim

Woong-Seop Lee

Jaejoo Shim

Wooyoung Jung

Chaehong Lim

Seunggeun Baek

Dowon Kang

Taechul Jung

Semiconductor device includes a substrate, gate electrodes stacked and spaced apart from each other in a first direction perpendicular to an upper surface of the substrate, separation regions penetrating the gate electrodes, extending in a second direction perpendicular to the first direction, and spaced apart from each other in a third direction perpendicular to the first direction and the second direction, channel structures arranged in columns in the third direction and rows in the second direction and penetrating the gate electrodes between the separation regions, and bit lines extending in the third direction on the channel structures. The channel structures include a first group of channel structures repeatedly arranged and including three columns arranged with a first pitch and a second pitch smaller than the first pitch in order, and the bit lines are arranged with at least one pitch smaller than the second pitch in the second direction.

Integrated circuit memory devices having multi-pitch channel columns therein

A linear compressor and a method for controlling a compressor are provided. The compressor may include a piston that reciprocates within a cylinder, a linear motor that supplies a driving force to the piston, a discharge device through which a refrigerant compressed in the cylinder by the reciprocating motion of the piston is discharged, a pressure changing device that changes a variation rate of pressure applied to the piston before the piston reaches a virtual discharge surface (VDS) during the reciprocating motion, to prevent collision between the piston and the discharge device. The virtual discharge surface may be formed on at least a portion of the discharge device facing a compression space within the cylinder.

Compressor and method for controlling a compressor

A linear compressor is provided which is capable of reducing noise and fabrication costs. The linear compressor may include a piston that performs a reciprocating motion within a cylinder, a linear motor that supplies a driving force to the piston, a sensor that detects a motor voltage and motor current associated with the motor, a valve plate provided at one end of the cylinder to adjust a discharge of a refrigerant compressed in the cylinder, a pressure changing unit or device that changes a variation rate of pressure applied to the piston before the piston reaches the valve plate during the reciprocating motion, and a controller that determines whether the variation rate of the pressure applied to the piston has changed using the detected motor voltage and motor current, and controls the motor to prevent the piston from colliding with the valve plate on the basis of the determination result.

Linear compressor and method for controlling a linear compressor

A method of fabricating a semiconductor device can include forming a channel hole in a vertical stack of alternating insulating and sacrificial layers to form a recess in a substrate. A selectively epitaxial growth can be performed to provide a lower semiconductor pattern in the recess using material of the substrate as a seed and a recess can be formed to penetrate an upper surface of the lower semiconductor pattern via the channel hole.

Semiconductor device and method of fabricating the same

Growing community of inventors

Seoul, South Korea

Jongyoon Choi