Abstract: A data transmission path establishing method for establishing a data transmission path from each device to a base station independently to thereby form a network with small devices which are required to consume lower amounts of power such as sensors, a radio communication network system and a sensor network system. A base station transmits detection signals to a plurality of radio devices. Each of the radio devices which have received the detection signal transmits detection response signals each including an identifier that uniquely identifies the device and doubling as a response signal and a detection signal for another radio device. Having received the detection response signal from a radio device, the base station recognizes the radio device as a radio device belonging to the station based on the identifier included in the detection response signal.

Abstract: A data transmission path establishing method for establishing a data transmission path from each device to a base station independently to thereby form a network with small devices which are required to consume lower amounts of power such as sensors, a radio communication network system and a sensor network system. A base station transmits detection signals to a plurality of radio devices. Each of the radio devices which have received the detection signal transmits detection response signals each including an identifier that uniquely identifies the device and doubling as a response signal and a detection signal for another radio device. Having received the detection response signal from a radio device, the base station recognizes the radio device as a radio device belonging to the station based on the identifier included in the detection response signal.

Abstract: A method for manufacturing hydrogen from a raw material that contains a chemical compound from which hydrogen is hardly obtainable, includes the steps of: converting the chemical compound from which hydrogen is hardly obtainable into a chemical compound from which hydrogen is obtainable by a conversion reaction; and generating hydrogen from the chemical compound from which hydrogen is obtainable by a reforming reaction and/or a hydrocarbon decomposition reaction. Therefore, the method of the present invention allows the production of hydrogen from the raw material that contains the chemical compound which is hardly applicable to the conventional hydrogen manufacturing method which is one obtaining hydrogen using reforming catalysts or one obtaining hydrogen by directly decomposing hydrocarbon.

Abstract: The invention provides a method for removing a photoresist from a material comprising the steps of removing the photoresist from the material by use of remover composition comprising a solvent selected from the group consisting of 4-methoxy-1-buanol, 3-methoxy-1-butanol and a mixture thereof and propylene carbonate and rinsing the remover remaining on the device by use of water.