Samsung Electronics Co., Ltd.

Samsung Electro-mechanics Co., Ltd.

Chang Soo Lim

Sung Tae Kim

Sang Kyeong Yun

Hyeong Joon Seo

Dong Won Lee

Jae Chan Lee

Hyun Hak Kim

Sung Jin Cho

Tae Eung Kim

Yong Min Jung

Woong Sun

Jae Hyuk Oh

Wook Jin Lee

Tae Keun Oh

Dong Seok Bae

Yong Sang Kong

Chang Seo Park

Kwang Nam Shin

Gi Young Byun

Kyung Seog Jang

Rock Hee Kim

The disclosure an air conditioning system and a method of controlling the same. During the heating operation of the A2W indoor unit, the A2A valve that connects the outdoor unit to the A2A indoor unit is closed to prevent the inflow of the refrigerant into the A2A indoor unit, so it is possible to prevent performance degradation by improving performance loss due to refrigerant bypass to a stationary A2A indoor unit. In addition, in order to improve the performance due to deterioration of heating performance, the system itself can cope with a control algorithm without any additional hardware configuration, thereby minimizing the installation cost.

Air conditioning system and method of controlling the same

A harbor lighting control apparatus is provided, which includes a plurality of slaves to perform on control or off control, and dimming control with respect to a light emitting diode (LED) array light source mounted to a lighthouse when an on control signal or off control signal, and a dimming control signal are received, and to transmit a result of the control as acknowledge signals, and a master to transmit the on control signal or off control signal and the dimming control signal to all of the plurality of slaves by a broadcast scheme, to transmit the on control signal or off control signal and the dimming control signal to an individual slave by a unicast scheme, and to recognize operational states of the plurality of slaves by receiving the acknowledge signals from the plurality of slaves. Accordingly, stable and reliably control of the harbor lighting is enabled.

Harbor lighting control apparatus

Disclosed herein is an electronic shelf label system. The electronic shelf label system includes a plurality of electronic tags that are installed on a product display stand and confirms the residual amount of a battery to turn-on a battery warning light when the residual amount is smaller than a reference voltage and transmits replacement request signals to inform the replacement time of the battery; and a wired/wireless communication converter that relays information between the electronic tags and a server and transmits the replacement request signals received from the electronic tags to be relayed thereby to the server. The electronic shelf label system of the present invention can intuitively and easily confirm the timing when the battery of the electronic is replaced, thereby making it possible to improve the efficiency in the working of replacing the battery.

Electronic shelf label system and method for driving the same

A comparator with hysteresis in which a reference voltage of the comparator is easily adjustable. A resistor for dropping the reference voltage and a current source are coupled to a reference voltage terminal, and function to adjust the reference voltage in response to the level of an output voltage. Thus, the hysteresis voltage of the comparator can be easily adjusted by varying the current flowing through the resistor.

Comparator with hysteresis

Growing community of inventors

Seoul, South Korea

Chang Soo Lim