Abstract:
PURPOSE: A shape lockable apparatus of a flexible tube is provided to improve operability and fixity of the flexible tube by being controlled a relaxed state and a fixed state of the flexible tube by rotating of joint ring and securing of a connection unit. CONSTITUTION: A flexible tube(10) comprises a bore(12), a first end(14), and a second end. The flexible tube is variously composed of the wire which is transformed into with an external force, a cable, and a conduit etc. A plurality of joint rings(20;20-1~20-n) is installed outside of the flexible tube. The joint rings rotate on a pair of pivots. A sleeve(22) is mounted in the flexible tube. The sleeve of the joint rings comprise a bore(22a), a first end(22b), and a second end(22c). A shape lockable apparatus of the flexible tube comprises an end ring(70).
Abstract:
본 발명은 플렉시블 튜브의 이완 및 고정 상태를 간편하게 제어할 수 있는 플렉시블 튜브의 형상 잠금장치를 개시한다. 본 발명은 복수의 로킹링들, 엔드링, 서포트링과 작동링으로 구성된다. 로킹링들은 플렉시블 튜브의 외면에 플렉시블 튜브의 길이 방향을 따라 이동할 수 있도록 장착되어 있다. 엔드링은 플렉시블 튜브의 제1 말단에 고정되어 있다. 서포트링은 플렉시블 튜브의 제2 말단에 헐겁게 끼워져 있으며, 로킹링들 중 그에 인접하는 로킹링을 지지하는 제1 측면과 플렉시블 튜브의 제2 말단이 빠져나와 있는 제2 측면을 가지고, 제2 측면에 복수의 가이드핀들이 형성되어 있다. 작동링은 플렉시블 튜브의 제2 말단에 고정되어 있으며, 가이드핀들을 따라 안내되도록 가이드핀들이 끼워지는 복수의 가이드구멍들이 형성되어 있다. 서포트링의 제2 측면에 작동링이 접촉되어 있는 경우 플렉시블 튜브의 이완을 허용하도록 로킹링들은 플렉시블 튜브의 길이 방향을 따라 이동되며, 서포트링의 제2 측면으로부터 이격되어 가이드핀들 말단에 작동링이 근접되어 있는 경우 플렉시블 튜브를 고정하도록 로킹링들은 서로 밀착된다. 본 발명에 의하면, 플렉시블 튜브가 당겨지는 간단한 구조에 의하여 엔드링과 작동링 사이의 링들이 고정적으로 밀착되어 플렉시블 튜브의 이완 및 고정 상태를 간편하게 제어할 수 있다. 또한, 링들의 협동에 의한 플렉시블 튜브의 고정력을 향상시킬 수 있는 효과가 있다.
Abstract:
PURPOSE: An elongate multijoint apparatus and an overlapping link comprising the same are provided, which are capable of facilitating change into mutual relaxation state and into mutual fixed state. CONSTITUTION: An elongate multijoint apparatus comprises: a pair of lever bodies expanded downward in the lower part of a first overlapping link which is one among a plurality of overlapping links; a pair of elastic levers(110) equipped with a fixed protrusion formed toward the outside in the end part of each lever body; a latch slot(210) in which a pair of elastic levers are inserted into the upper part of a second overlapping link which is serially connected to the lower part of a first overlapping link, which is arranged in the inner circumference of a slit groove in the semicircular shape in order to make a fixed protrusion of a pair of elastic levers which are inserted to be selectively fixed respectively; a pressure offering member(310) of which first and second overlapping links make an inter-fixture state or a cross-relaxation state as it is imposed between a pair of elastic levers, offers or releases pressure in the inter space direction.
Abstract:
PURPOSE: A multi-joint device using rheological fluid is provided to easily control joint motion by applying electric field or magnetic field on a joint as electrorheological fluid or magnetorheological fluid are accepted into a joint. CONSTITUTION: A multi-joint device using rheological fluid comprises links(20) and a joint(21). The joint is formed between links. A liquid containment space is formed between links. The rheological fluid is accepted into the liquid containment space. The viscosity of the rheological fluid is increased by the electric field or the magnetic field.
Abstract:
PURPOSE: A diameter control method of a carbon nanotube using a template is provided to insure convenience of a process by selectively removing a metal on the outer surface of the template before growing the carbon nanotube. CONSTITUTION: A diameter control method of a carbon nanotube comprises the following steps: doping a metal precursor on a template; reducing the precursor by heat-treating under the hydrogen atmosphere; removing a metal on the outer surface of the template by processing with nitrogen plasma; and growing the carbon nanotube by providing methane gas. The template is an organic silica mesoporous template. The metal precursor is transition metal salt.
Abstract:
PURPOSE: A method for generating hydrogen using a core / shell nano particle is provided to prevent a core portion from becoming oxidized by making the shell protect a pure metal nano particle of the core and to easily generate hydrogen through a reaction with water. CONSTITUTION: A method for generating hydrogen using a core / shell nano particle includes a step of eliminating a shell by contacting the core / shell nano particle with water and using an oxidation reaction. The shell is eliminated through etching or by heating the shell with a temperature over the melting point of the nano particle. Hydrogen is created through the oxidation reaction with water. The metal is titanium(Ti), iron(Fe), nickel(Ni), cobalt(Co), or aluminum(Al). The oxidation of the pure metal of the core is prevented when the shell does not react with the water. An etchant for removing the shell is hydrochloric acid, nitric acid, hydrofluoric acid, sulfuric acid, or NaOH.
Abstract:
A method for manufacturing a transition metal-carbon nanotube hybrid material is provided to produce the hybrid material simply by the medium of nitrogen having high reactivity present within carbon nanotubes even without using a separate surface treatment or an inhibitor. A method for manufacturing a transition metal-carbon nanotube hybrid material includes a step of reducing a transition metal by a reduction reaction within a solution comprising nitrogen-containing carbon nanotubes and a transition metal salt. A nitrogen content in the carbon nanotubes is 0.01-20at%. A solvent forming the solution is polyol. The transition metal salt is an acetate or chloride salt. The nitrogen-containing carbon nanotubes are prepared by reacting hydrocarbon gas with nitrogen gas in the presence of a metal catalyst by plasma chemical vapor deposition.
Abstract:
Carbon nitride C1-xNx nano-tube having pores of less than 1nm is provided to have size and quantity controlled pores over entire portion of structure of the nano-tube by reacting hydrogen carbide gas and nitrogen gas in the presence of metal catalyst through plasma chemical vapor deposition. The carbon nitride nano-tube is represented by C1-xNx wherein x ranges from 0.001 to 0.2 and has pores with diameter of 5 to 10 angstroms. The nano-tube is prepared by reacting 10-90% of hydrogen carbide gas with 10-90% of nitrogen gas in the presence of metal catalyst through plasma chemical vapor deposition. The metal catalyst is any one selected from a group consisting of cobalt, iron, nickel and metal compounds containing any one thereof. The hydrogen carbide gas has 1 to 10 of carbon atoms.
Abstract:
An adaptive shunt system for controlling vibrations of a frequency-varying structure, the system comprising: a detector for detecting vibrations generated from a predetermined structure and generating vibration signals corresponding to the vibrations; a computer for inputting the vibrations signals from the detector; a signal processing unit for processing the vibration signals from the computer and generating a voltage command in real-time; and an adaptive shunt device for adaptively controlling the vibrations of the structure of which natural frequency varies at every moment according to the voltage command.
Abstract:
PURPOSE: An adaptive shunt circuit for suppressing the vibration of a structure and a method for operating the same are provided to suppress the vibration of the structure by changing the characteristics of the circuit in response to the change of the natural frequency. CONSTITUTION: An adaptive shunt circuit for suppressing the vibration of a structure includes a converting block(100) for converting the vibration energy of the structure into an electrical signal, a resonance block(200) for amplifying the electrical signal, a frequency varying block(300) for varying the electrical central frequency of the resonance block(200) in response to the order voltage applied from outside, a power supply block(400) for supplying a power to the converting block(100), the resonance block(200) and the frequency varying block(300).