• 한국산업융합학회 논문집
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• 제26권1호
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• pp.15-26
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• 2023

In this study, an end-effector robot which is a two-axis delta robot type for upper-limb rehabilitation is designed. It is not only rehabilitation functions that has designed robot but also mechanical and electrical safety devices were constructed to ensure patient safety. By constructing the two-axis delta robot is combined with an LM guide, the operating range and rigidity required for rehabilitation were secured. The electrical safety system which is required for the medical robot was designed, and a safety strategy was established to ensure patient safety and it is applied in the integrated safety circuit. The safety is considered in whole design process from the robot's mechanical design to the electric control unit.

• 한국안전학회지
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• 제8권4호
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• pp.95-100
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• 1993

In power transistor switching circuit have shunt snubber(dv/dt limiting capacitor) and series snubber (di/dt limiting inductor). The shunt snubber is used to reduce the turn-off switching loss and the series snubber is used to reduce the turn-on switching loss. Design procedures are derived for selecting the capacitance, inductor and resistance to limit the peak voltage and current values. The action of snubber is analyzed and applied to the design for safety PWM inverter.

• 한국철도학회:학술대회논문집
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• 한국철도학회 1999년도 춘계학술대회 논문집
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• pp.299-306
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• 1999

The ${\mu}$-processor based-controlled system is widely used in railway signaling system. The railway signaling systems are highly required safety and reliability. It is necessary to have a fault-tolerant and fail safe concept in ${\mu}$-processor based railway signaling system. In this paper, several architectures and circuits of fault-tolerant computer system is reviewed. The basic concept of the fault-tolerant computer system will be adapted total self checking, strong fail safe, fault display circuit, logic testing circuit and system switching concepts.

• 한국군사과학기술학회지
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• 제21권5호
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• pp.684-696
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• 2018

The mission in missile systems can be conducted with multiple phases according to the characteristics of the systems and the targets. The safeguarded multi-phase mission includes a safeguarded phase before launch for considering the safety of operators in unexpected squib activation. However, the safeguard function should be disabled after launch to complete the mission. Therefore, the squib system needs to be selectively activated according to the phases. This paper presents a selective squib activation and check circuit design for safeguarded multi-phase missions in missile systems. The presented circuit design was implemented with various electronic components including a field-programmable gate array(FPGA). Its functions and performance were validated by both many ground tests and several flight tests.

• 한국산업융합학회 논문집
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• 제20권2호
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• pp.187-194
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• 2017

This study examined the validity and reliability of the thermal safety design, in order to maintain the heat generated from integrated circuit (IC) chips in the converter, condenser, resistor, and transistor (which are considered as heat sources for thermoelectric devices with a printed circuit board) below target levels during the process of developing a control board and a main power board. The study analyzed the heat generation and dissipation characteristics of the entire printed circuit board (PCB) model to examine its thermal safety.

• 전기의세계
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• 제29권5호
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• pp.303-311
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• 1980

The hazards of electrical shock are well known, but the conventional ground fault circuit breakers did not provide the statis factory safety for human body. Thus this paper considers the standards of performance that they must meet, and describes the new tripping mechanism the operations and the improvements. The experiment at new G.F.C.I. indicates maximum tripping time 25msec minimum sensitive leakage current 25mA and maximum nonaperation leakage current 15mA.

• 전자공학회논문지
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• 제54권1호
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• pp.147-151
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• 2017

원유 탱크나 가스 저장소 등과 같이 상시 폭발 가능한 농도의 지역을 0종 지역이라고 한다. 0종지역에서 각종 장비를 사용하기 위해서는 본질적으로 스파크가 일어나지 않는다는 것을 보증할 수 있는 본질안전인증을 득해야 한다. 본질안전인증을 취득하는 장치는 대부분 간단한 단품 소자이거나 장치가 대부분인데 본 연구에서는 수백가지 부품이 PCB 기판에 실장된 초음파 발생 장치와 마이크로컨트롤러가 포함된 전자전자회로를 본질안전인증을 취득하려고 하는 것이므로 매우 어려운 과정이었다. 본 연구를 통해 까다로운 본질안전인증을 대비한 회로 설계를 어떻게 해야 하는지에 대한 방법을 파악할 수 있게 되었으며 향후 본질안전인증을 취득하게 될 경우 본 연구의 결과를 이용하면 보다 용이하게 본질안전 회로를 설계할 수 있게 될 것이다.

• 전자공학회논문지
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• 제51권10호
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• pp.197-203
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• 2014

신관 안전장전장치는 비행체의 수송, 저장, 취급 중의 안전을 절대적으로 보장하도록 설계되어야 한다. 본 논문에서는 비행체에 적용되는 신관 안전장전장치의 안전성을 증대시키기 위한 솔레노이드 조립체와 솔레노이드 조립체를 구동하기 위한 솔레노이드 구동회로를 포함한 신관 안전장전장치 설계에 대해 기술한다. 솔레노이드 조립체는 신관 안전장전장치에 적용한 추가적인 안전장치로서, 코일 조립체, 복원스프링, 코어 등으로 구성된다. 솔레노이드 조립체의 코어는 평상시에는 1차 안전장치를 구속하고 있어 1차 안전장치가 작동하는 것을 저지해줌으로써 비행체의 취급이나 수송 시 안전을 확보해주게 되며, 발사를 위한 비행체 배터리 전원이 인가 및 활성화되어 신관 안전장전장치에 공급되면, 솔레노이드 구동회로가 코어를 작동시켜 신관 안전장전장치의 1차 및 2차 안전장치를 해제시키는 역할을 한다. 또한, 솔레노이드 구동회로는 비행체 발사 이후, 신관 안전장전장치의 기계적 장전이 완료되어 장전스위치가 turn-on되면 솔레노이드 조립체에 인가되는 전원을 자동 차단시켜 비행 중의 전원 소모량을 줄일 수 있도록 하였다.

• Tribology and Lubricants
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• 제20권5호
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• pp.231-236
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• 2004

Sulfur Hexafluoride, S $F_{6}$ is widely used for leak detection and as a gaseous dielectric in transformers, condensers and circuit breakers. S $F_{6}$ gas is also effective as a cleanser in the semiconductor industry. This paper presents a numerical study of the sealing force of disk type seal in S $F_{6}$ gas safety valve. The sealing force on the disk seal is analyzed by the FEM method based on the Taguch's experimental design technique. Disk seals in S $F_{6}$ gas safety valve are designed with 9 design models based on 3 different contact length, compressive ratio and gas pressure. The calculated results of Cauchy stress and strain showed that the sealing characteristics of Teflon $^{ }$PTFE is more effective compared to that of FKM(Viton), which is related to the stiffness of the materials. And also, the contact length of the disk seal is important design parameter for sealing the S $F_{6}$ gas leakage in the safety valve.afety valve.

• 전기학회논문지
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• 제67권12호
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• pp.1619-1625
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• 2018

Portable electronic devices secondary batteries can cause fire and explosion due to micro-current change in addition to the situation of short-circuit inrush current, safety can not be secured with a general operation limited current fuse. Therefore, in secondary battery, it is necessary for the protector to satisfy both the limit current type operation in the open-short-circuit inrush current and the current detection operation characteristic in the micro current change situation and for this operation, a fuse for the current detection type secondary battery protection circuit can be applied. The purpose of this study is to design a protection device that operates stably in the hazardous situation of small capacity secondary battery for portable electronic devices through the design of low melting fuse elements alloy of sensing type fuse and secures stability in abnormal current state. As a result of the experiment, I-T and V-T operation characteristics are satisfied in a the design of the alloy of the current sensing type self-contained low melting point fuse and the resistance of the heating resistor. It is confirmed that it can prevent accidents of short circuit over-current and micro current change of secondary battery.