Abstract:
겔 위에 마이크로구조체를 로딩하는 단계; 상기 마이크로구조체가 로딩된 겔 위에 폴리머 용액을 도포한 후 경화시키는 단계; 경화된 폴리머층을 상기 겔로부터 분리하는 단계; 상기 경화된 폴리머층의 마이크로구조체가 노출된 면에 플라즈마를 공급하거나 차단제를 처리하는 단계; 상기 경화된 폴리머층으로부터 마이크로구조체를 단리하는 단계; 및 상기 단리된 마이크로구조체에 흡착대상 물질을 처리한 후 세척하는 단계를 포함하는 마이크로구조체의 표면 일부에 흡착대상 물질을 선택적으로 부착시키는 방법 및 상기 방법에 의해 제조된 마이크로구조체가 제공된다. 본 발명의 방법에 따르면, 기존의 마이크로구조체의 코팅을 통한 박테리아 부착 방법에서 보이는 전체 면적의 1/2 만을 코팅하여 제작된 마이크로 로봇에 비해 운동성 및 방향성 제어 성능이 향상된 마이크로 로봇 제작에 기여할 수 있다.
Abstract:
PURPOSE: An even number inverter is provided to efficiently control reactive power by comprising a bidirectional switching element only with transistors. CONSTITUTION: A division part(210) divides input DC power into the voltage levels of an even number. Multiple switching elements are connected to each node of the division part. Bidirectional switching elements(230) are connected to each node through at least one of the switching elements. The bidirectional switching element comprises at least 2 transistors. The division part comprises at least 2 capacitive elements.
Abstract:
PURPOSE: An electric phase modifier capable of using a linear region of a switching element and a permanent magnet synchronous generator equipping the electric phase modifier are provided to prevent the generation of an abrasion and arc of contact point when charging/discharging a condenser, thereby improving output voltage properties. CONSTITUTION: A plurality of power factor compensation circuits(110,110n) compensates for an output voltage and a power factor. The power factor compensation circuit is connected in parallel to each phase output of the permanent magnet synchronous generator. The master controller(120) calculates the error amount of an instruction value voltage. A sub controller(130) turns on/off the power factor compensation circuits and compensates the error amount. A three phase condenser is connected to each phase output and compensates for the output voltage and power factor of the permanent magnet synchronous generator.
Abstract:
PURPOSE: An apparatus and a method for analyzing chemotaxis of cells or cell-based micro-robots are provided to enable users to easily culture cancer cells and normal cells. CONSTITUTION: An apparatus for analyzing chemotaxis of cells or cell-based micro-robots comprises a first substrate, a second substrate, and hydrogel(8). The second substrate comprises a chamber(3) for loading the cells or cell-based micro-robots, one or more chambers(4) for loading analytes, and a channel(5). The channel connects the chamber for loading the cells or cell-based micro-robots, and the chamber for loading analytes. The hydrogel is injected into the chamber for loading analytes.
Abstract:
PURPOSE: A boost converter of a soft switching mode is provided to improve power conversion efficiency by offering switching loss of a main switch through resonance of leakage inductance of a capacitor and a transformer. CONSTITUTION: An anode of a second circulating diode(116) is connected to a terminal between a main switch and an inductor for resonance. A cathode of the second circulating diode is connected to one end of the capacitor for resonance. One end of an auxiliary switch(117) is connected to a terminal between the second circulating diode and the capacitor for resonance. A primary side of a transformer(118) is connected to the other end of the auxiliary switch and a minus terminal of an input power source. A secondary side of the transformer is connected to an output terminal and a plus terminal of the input power source.
Abstract:
PURPOSE: A zero current switching type DC/DC converter is provided to reduce a switching loss by using a zero current switching method. CONSTITUTION: A zero current switching type DC/DC converter comprises a DC voltage input unit, a high frequency transforming unit(200), and a DC voltage output unit. The DC voltage input unit comprises a voltage source(114) and a switch element. The DC voltage input unit comprises resistance(124) and a second capacitor(122) respectively serially connected to the voltage source and a coil. A third capacity(112) is connected in parallel with the voltage source. The high frequency transforming unit comprises the coil, a first capacitor(134) LC resonating a leakage inductance component of the coil.
Abstract:
본 발명은 피엘엘 제어의 기본파 성분 획득방법 및 그 방법을 이용하는 피엘엘 제어기에 관한 것으로, 보다 구체적으로는 계통연계를 위한 피엘엘 제어의 계통전압 기본파 성분 획득시에 저역 통과필터를 사용하지 않고 고역 통과필터를 사용하여 기본파 성분을 획득함으로써 위상 추종시에 시간응답이 우수하고, 고조파가 완벽히 제거된 기본파 성분을 획득할 수 있는 피엘엘 제어의 기본파 성분 획득방법 및 그 방법을 이용하는 피엘엘 제어기에 관한 것이다.
Abstract:
본 발명은 전류형 유도가열 시스템에 관한 것으로, 보다 구체적으로는 입력측에 커패시터를 제거하여, 전력효율 고정회로(PFC 회로:Power Factor Correction 회로, 이하 'PFC 회로'라 함)를 사용하지 않고도 단위역률의 입력이 가능하여 고 역률화를 실현할 수 있고, 소자의 파괴나 단락회로 보호에 강인한 단위 역률 입력을 위한 전류형 유도가열 시스템에 관한 것이다.
Abstract:
PURPOSE: A synchronous DC/DC converter of a zero voltage switching mode using a tab transformer is provided to minimize rectification loss by forming switching devices of a rectifier part by using a MOSFET(Metal Oxide Semiconductor Field Effect Transistor) switch instead of a diode. CONSTITUTION: One end of a chopper switch(110) is connected to one end of a DC input voltage. An inverter unit(120) is connected to the other end of the chopper switch and one end of an input voltage. The inverter unit outputs an AC voltage by switching the input voltage. One end of a free wheeling device(130) is connected between the chopper switch and the inverter part. The other end of the free wheeling device is connected to the other end of the DC input voltage. The free wheeling device forms reflux pass in an off-state of the chopper switch. A tap transformer(140) transforms the AC voltage. A rectifier(150) is connected to an output end of the tap transformer. The rectifier performs a switching operation through synchronization with the inverter unit.
Abstract:
PURPOSE: A current type induction heating system for inputting a unity power factor is provided to protect a short circuit by using a current source as the input of a resonance part. CONSTITUTION: A rectifier(110) outputs DC power by rectifying commercial electricity. A convertor part(120) generates an input current source by switching the DC power outputted from the rectifier. The convertor part outputs the input current source generated to a resonance part(140). The convertor part comprises a switch(121), an input side inductor(122), and a free wheeling diode(123). The inverter unit performs a switching operation to apply the input current source to the resonance part to forward direction and reverse directions. The inverter unit comprises a first switching device(131), a second switching device(132), a third switching device(133), and a fourth switching device(134). The resonance part changes a switched input current source in the inverter unit into an electromagnetism.