Abstract:
Disclosed are a method for transceiving packets for traffic distribution, and an access point and a terminal apparatus using the same. The access point according to the present invention includes a wireless LAN communications module; a visible light communications module; and a traffic distribution unit to confirm a characteristic of a packet to be transmitted for determining whether the packet is a control packet or a data packet, to classify and transmit the packet using the wireless LAN communications module when the packet is the control packet or a data packet of low capacity, to classify and transmit the packet using the visible light communications module when the packet is a multi-media or a data packet of high capacity.
Abstract:
The purpose of the present invention is to provide a ship station communication apparatus and ship station communication method, which enable direct communication between adjacent ships as well as two-way communication between a ship station and a coast station without increasing a size of a ship station or costs. A ship station communication apparatus for communication between a ship station and another ship station and communication between the ship station and a coast station according to an exemplary embodiment of the present invention may comprise: a first switch configured to switch an operation between a transmission unit of the ship station and a reception unit of the ship station; and a second switch configured to switch a frequency of the reception unit.
Abstract:
Disclosed is a device for managing a service in a restaurant, capable of: minimizing an unnecessary movement of an employee; monitoring the service response time, etc. of the employee by managing the employee who responds to a service and information on the time when the service is requested; and allowing customers to directly know a current status of the requested service through colors of lighting. The device for managing a service in a restaurant comprises an employee ID sender for outputting the embedded employee ID information through a wireless visible light communication; a call bell which has a button for calling employees or requesting a service, transmits, to a management server, the employee ID information from the employee ID sender and information on the requested service and receives waiting time information on the requested service; the management server for managing the service response time from the time of checking the service requested by a customer to the time of providing the requested service and information on the number of providing services by the employees and outputting status information on the service requested by the customer; a lighting scheduler for storing situation based lighting color information, deriving lighting status information based on the status information on the requested service provided by the management server and outputting the lighting color information corresponding to the derived lighting status information among the situation based lighting color information; and a table lighting unit for transmitting the waiting time information on the requested service to the call bell through the wireless visible light communication and adjusting the lighting colors of a table of the customer who requests the service based on the lighting color information from the lighting scheduler. [Reference numerals] (100) Employee ID sender; (200) Call bell; (300) Management server; (400) Lighting scheduler; (500) Table lighting unit; (600) Order menu detail display unit; (AA) Table number #1; (BB) Table number #2; (CC) Table number #m; (DD) Order 1; (EE) Order 2; (FF) Order n; (GG) VLC(Employee ID); (HH) VLC(Order status information)
Abstract:
Disclosed are a method and an apparatus for visible light wireless communications. The method for visible light wireless communications according to the present invention comprises the steps of: comparing a symbol of a transmission signal with a symbol clock synchronized with the symbol to determine whether the comparison result represents a beginning portion of the symbol; setting a sample index representing the order of samples sampled from the symbol of the transmission signal at predetermined frequency intervals, an accumulated signal value of the accumulated area of the first half of the symbol, and an accumulated signal value of the accumulated area of the latter half of the symbol, depending on whether the comparison result represents the beginning portion of the symbol; comparing the sample index with the middle point of the symbol of the transmission signal to determine whether the comparison result belongs to the accumulated area of the first half or the latter half of the symbol, and accumulating the samples of the transmission signal according to positions to which the sample index belongs; comparing the sample index and a sample index per symbol, and checking if the sample index equals to the sample index per symbol to determine whether the comparison result represents an end portion of the symbol; and outputting a variable pulse position modulation (VPPM) communications signal corresponding to the transmission signal, depending on whether the comparison result represents the end portion of the symbol. [Reference numerals] (AA) Start; (BB.EE.FF.II) Yes; (CC,DD,GG,HH) No; (JJ) End; (S10) Symbol clock; (S15) Beginning of the symbol?; (S60) End of the transmission?
Abstract:
Disclosed is a method for detecting errors and changes of an LED light. A method for detecting errors and changes of an LED light according to the present invention includes the steps of: generating a pulse width modulation (PWM) signal including required light emitting information; generating tail information (Tail-Data) including operation information; generating a cyclic redundancy code (CRC) value according to the tail information; generating a tail-CRC synthesis signal (Tail-CRC signal) by synthesizing the tail information and the CRC value; generating a PWM-tail synthesis signal (PWM-Tail Signal) by combining the tail-CRC synthesis signal and the PWM signal; and detecting errors and changes by using the PWM-tail synthesis signal.
Abstract:
The present invention provides a fault control apparatus of a lighting network. The fault control apparatus is comprised in each of a plurality of lighting units which are connected with each other through a network, and includes: a power source selection part which selects a power source to be supplied to a faulty lighting unit, by comparing a reference voltage with an output voltage sensed from power supply signals respectively inputted through a power supply part comprised in a lighting unit located before the faulty lighting unit and through the faulty lighting unit in case that the lighting unit has a fault; and a lighting control part controlling the driving of the faulty lighting unit by using the selected power source. [Reference numerals] (110) First transceiver part; (120) Lighting control logic part; (130) Second transceiver part; (140) Lighting driving part; (150) Power source selection part; (151) Power source sensing part; (160) Power supply part; (161) Charging part
Abstract:
본 발명의 가시광 통신 장치는, 송신단말로부터 수신한 가시광 수신신호로부터 타겟 파장의 신호만을 필터링하는 타겟 신호 수신부; 타겟 파장의 신호의 특성을 이용하여 가시광 수신신호의 수신 품질을 판단하고, 수신 품질에 따라 타겟 파장과 상이한 파장을 갖는 하나 이상의 광원을 이용하여 가시적 신호를 생성하는 신호 생성부; 및 데이터가 전송되는 타겟 파장의 신호가 가시적 신호와 함께 송신되어 가시광 송신신호의 발광색이 변경되도록 하는 광신호 송신부를 구비한다. 본 발명에 의하면, 가시광을 이용한 통신에서 사용자로 하여금 현재의 통신 품질을 색으로 인식 가능하게 하는 효과를 갖는다.
Abstract:
전송 속도, 얼라인 상태, 통신 상태 또는 전송률 등을 직관적으로 인식할 수 있는 가시광 통신 기술이 개시된다. 본 발명에 따른 가시광 통신 장치는, 가시광 영역 내의 파장에 따라 구별되는 직관 정보를 고려하여, 서로 다른 파장의 광을 발생시키는 복수 개의 광원들 중 하나 이상의 광원을 선택하는 광원 선택부; 및 선택된 상기 하나 이상의 광원에 의하여 가시광 통신을 수행하여 상기 하나 이상의 광원에 상응하는 색에 의하여 상기 직관 정보가 인식되도록 하는 가시광 통신부를 포함한다. 따라서, 가시광 통신을 이용하는 사용자가 최적의 통신 상태 또는 전송 속도 등을 직관적으로 알 수 있다.
Abstract:
가시광 무선 통신시 조명의 밝기 변화를 줄일 수 있는 라인 코딩 기법이 개시된다. 본 발명에 따른 가시광 무선 통신 송신기는 소스 비트열을 수신하여 제1 개수의 비트들 단위의 소스 코드들로 인식하는 소스코드 인식부; 상기 소스 코드들 각각을 상기 제1 개수보다 큰 제2 개수의 비트들 단위의 인코딩 코드로 인코딩하는 라인 코딩부를 포함한다. 특히, 상기 인코딩 코드는 1에 해당하는 비트수와 0에 해당하는 비트수가 동일하다. 따라서, 가시광 무선 통신시 조명의 밝기 변화를 최소화할 수 있다.
Abstract:
본 발명은 무선 통신 단말기의 동작 방법에 관한 것이다. 본 발명의 무선 통신 단말기의 동작 방법은 사용자 인터페이스를 통해 이벤트를 검출하는 단계, 이벤트 검출에 응답하여 무선 통신 채널을 통해 위치 정보를 검출하는 단계, 그리고 검출된 이벤트의 정보 및 검출된 위치 정보를 사용자 인터페이스로 출력하는 단계로 구성된다.