• Proceedings of the Korea Contents Association Conference
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• 2010.05a
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• pp.200-203
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• 2010

The obstructive factors of the smoothly running traffic are street improvement, major commercial buildings like department stores, the large markets, the stadiums, the concert buildings, a lot of steady cars for using parking lot. The accident of cost many lives and traffic congestion from these factors cause the result that it enables to pay the enormous expenditure socially and financially. For solving these problems, Japan adopts the Traffic Flagger System in 1972. This task has the effects of improving traffic flow in the traffic jam and mitigating risk of car accidents as leading pedestrians and vehicles thereby the task carries into effect in the area where the accident took place. Moreover, this security task is rapid growth after adopting and 59.6%(5,317) of the whole security company 8,924 in Japan based on December 2009 registered as the traffic leading security business. While South Korea is demanded of the measures about obstructive factors of the smoothly running traffic, it represents the limitation of the system and the safety management. Thus the current study suggests the we will analyze South Korea's actual condition and then discuss the law and education system for a realizable plan reached the public-Private cooperation for adopting Japan's Traffic Leading Security System.

• The Journal of the Korea institute of electronic communication sciences
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• v.16 no.6
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• pp.1019-1028
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• 2021

Emergency exit guidance lights were designed and manufactured to quickly determine the location of the emergency exit in the event of a fire using a gas sensor, an illumination sensor, a temperature sensor, an Arduino Uno, and a Bluetooth module. This research was designed such that, when a fire breaks out, a red arrow appears as the illuminance value is low and a green arrow as the illuminance value is high to improve visibility when detecting high temperature and smoke. In addition, it is designed to prevent more serious conflagration by applying an alarm sound and text transmission algorithm using a communication module to transmit text messages indicating a 174Hz alarm sound and a fire location to prevent more serious conflagration.

• Electronics and Telecommunications Trends
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• v.17 no.4 s.76
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• pp.135-144
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• 2002

통신에 장애를 일으키는 주요한 요인으로서 전자기 현상의 가장 기초적인 원리인 인근 전력선에 의한 유도전압 발생 문제가 있다. 이것은 주로 강전류전선에 의한 영향으로서 전기의 송배전 지역 또는 전기철도 시설 등 고전압에 의한 통신 유도장애에 해당하는 문제이다. 이러한 강전류전선에 의한 유도장애에 대비하려면 발생되는 유도전압을 미리 예측하여 산출하는 것이 필요하다. 본 논문에서는 전력유도전압 산출방법과 관련된 강제표준격인 현행 국가기술기준 고시에 대한 기술적 보완이 필요한 부분에 대하여 연구된 내용을 소개한다.

• Journal of Life Science
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• v.26 no.12
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• pp.1409-1414
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• 2016

In the larvae of the black soldier fly, Hermetia illucens, innate immunity mechanisms are activated in response to various pathogens and stimulants, resulting in the expression of antimicrobial peptides (AMPs). To induce the mass production of AMPs, H. illucens fifth instar larvae were immunized with five different kinds of bacteria. We isolated from the hemolymph of the H. illucens larvae after bacterial challenge, and their antimicrobial activities against Gram-positive bacteria (Staphylococcus aureus) and Gram-negative bacteria (Escherichia coli) were measured using the inhibition zone assay. Among these five different kinds of bacteria, the hemolymph of Bacillus subtilis-challenged H. illucens larvae showed the strongest antimicrobial activity against both Gram-positive bacteria and Gram-negative bacteria. The antimicrobial activity of the hemolymph of $1{\times}10^9cfu/ml$ B. subtilis-challenged H. illucens peaks at 24 hr at 48 hr post-infection and gradually declines with time. Moreover, the immunized hemolymph also showed strong antimicrobial activity against various poultry pathogens such as S. enteritidis, S. typhimurium, and S. pullorum. These results suggest that the expression of AMP genes in B. subtilis-challenged H. illucens is up-regulated by innate immune responses, and that B. subtilis-challenged H. illucens overexpressing AMPs may be useful as a feed additive in livestock diets to reduce the need for antibiotics.

• Journal of the Society of Disaster Information
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• v.16 no.2
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• pp.392-401
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• 2020

Purpose: This study analyzes the operating characteristics of a lithium ion capacitor that can be used as a standby power supply in an emergency, and determines whether the standby power supply is abnormal even by measuring the voltage using a linear proportionality characteristic during charging and discharging. The aim is to provide an experimental basis that can be done. Method: As a method for this study, first, analyze the operation principle and characteristics of the existing backup power supply and lithium ion capacitor, and then measure the voltage of the lithium ion capacitor according to the configuration and system block diagram of the induction lamp used in the experiment. We proceed with the test of the measured value of discharge power for each voltage band to check the amount of power held by the battery and the operation test experiment using induction lamps. Results: Just by checking the charging voltage using the linear proportional characteristics of lithium ion capacitors, it provides a basis for accurately inferring the effective operating time of induction lamp lamps. Conclusion: In the event of a disaster, the lithium ion capacitor is used as a spare power supply for emergency induction lamps to prevent complete discharge of emergency induction lamps, to prevent the problem of performing normal operation of the standby power supply, and to use only a simple voltage measurement to reserve power. It was intended to suggest many uses for evacuation equipment application in the future by making it possible to check whether the device is abnormal.

• The Journal of the Convergence on Culture Technology
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• v.7 no.4
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• pp.765-778
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• 2021

The purpose of this study is to prevent fire accidents in advance by deriving prior knowledge among groups about temporary fire-fighting facilities of workers at construction sites and devising appropriate improvement measures. The findings are as follows.First, in the case of fire extinguishers, statistical attention was paid to the contractor, supervisor, partner worker and fire extinguisher manager between designations. 87% of fire managers and 70% of facility supervisors said fire extinguisher management managers needed to be designated for each type of construction, which requires designation of fire extinguisher management managers, frequently checking and relocating. Second, in the case of simple fire extinguishing facilities, statistical attention was paid to the application of penalties for unauthorized use of fire extinguishing facilities with construction companies, supervisors, and business partners.Third, in the case of emergency alarm measures, statistical attention was paid to the application of emergency alarm sound to temporary broadcasting facilities with construction works, supervisors, and business partners.Fourth, in the case of induction, statistical attention was paid to the application of connection between construction works, supervisors, and partner workers, such as passage guidance, emergency lighting, etc.It was found that 65% of construction workers and 55% of electrical workers had different applications such as aisle guidance and emergency lighting for each type of business partner. In order to resolve blind spots such as evacuation zone guidance due to the structure of the building, it is necessary to easily distinguish the direction of the entrance door from a long distance by applying it in conjunction with passage guidance lights and emergency lighting.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.492-498
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• 2016

It is well known that since abrupt faults in induction motors tend to lead to subsequent faults and deterioration of the drive apparatus, motor faults may lead to several operating restrictions, such as security problems and economic loss. A lot of research has been done in the area of diagnosis to detect machine faults and to prevent catastrophic hazards in the motor drive system. This paper presents a new method of motor current signature analysis in which the DC-link current of the inverter-driven induction motor system, where a single current sensor is employed instead of three AC current sensors, is measured, and fast Fourier transform analysis is performed. This proposed method makes it possible to easily discern and clearly separate the motor fault current signature from the normal operation current flowing through the stator and rotor windings.

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.326-328
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• 2008

본 논문의 목표는 실제 시스템과 가장 유사한 이중여자 유도발전기(Doubly-Fed Induction Generator)의 시뮬레이터를 구현하고 실험을 통해서 그것을 검증하는 것이다. 바람의 속도를 2D 룩업 테이블을 이용하여 데이터화 한 후 터빈 모델의 입력으로 인가한다. 터빈 모델의 파라미터는 실험용 이중여자 유도발전기의 것과 동일하게 설정하여 실제 시스템과 유사하게 하였다. 지금까지는 이중여자 유도발전기를 모사하기 위하여 매트랩(Matlab) 등을 이용하였지만 실제와 다소 다르다는 문제와 구현하기 힘들다는 문제를 가지고 있었다. 하지만 본 논문에서는 심플로러(Simplorer)를 이용하여 쉽고 정확한 시뮬레이터를 구현하였다. 터빈과 이중여자 유도발전기는 기어를 이용하여 직결함으로써 실제 시스템과 매우 가깝게 모사하였으며 이중여자 유도발전기의 회전자를 여자시키기 위해 이산 캐리어 변조 방법을 이용하여 매트릭스 컨버터를 구동하였다. 그리고 실험을 통해서 시뮬레이터의 결과와 실험 결과의 비교 및 검증을 한다. 궁극적으로 어떤 지역의 바람의 품질과 발전량 등 중요한 정보를 얻기 위해 실제 크기의 발전기를 설치하지 않고 본 논문에서 개발한 시뮬레이터를 이용하여 쉽게 그 정보들을 얻을 수 있다.

• Journal of Embryo Transfer
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• v.12 no.3
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• pp.253-258
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• 1997

토끼에서는 수정란 이식과 같은 기본적인 번식공학적 방법의 효율성이 아직 생쥐와 같은 실험동물에 비해 떨어지고 있어 생물공학적인 기술을 응용하는데 큰 어려움이 있다. 특히 유전자 이식에 의한 형질전환 토끼의 생산과 같은 생물공학적인 기술을 실용화하는데 효율이 높은 수정란이식 기술의 개발이 필수적이라고 할 수 있다. 본 연구에서는 토끼에서 수정란 이식 기술의 첫 단계인 과배란 유도를 효율적으로 이용할 수 있는 방법을 정립하기 위해 반복적인 과배란 유도가 배란율 및 수정란의 질적인 면과 양적인 면에 미치는 영향을 조사하였다. 연구방법으로는 FSH와 HCG를 사용하여 과배란을 유도하였고 2.5 개월의 반복처리간격으로 3번의 반복적인 과배란 처리를 한 후 반복처리에 따른 배란율과 배란된 난자의 형태학적 상태, 배양에 의한 발생 능력 상태 등을 감소하였으며 배란수의 변이도 커지는 경향을 나타내었다(첫번째, 32.6(+-)2.5; 두번째 28.7(+-)3.7; 세번째 20.99(+-)3.8). 제 2극체의 돌출, 전핵의 형성, cummulus cell의 존재등에 의한 회수된 난자의 형태학적 관찰에 의한 방법으로 난자를 분류한 결과 과배란의 반복수가 증가함에 따라 다양한 모양의 난자가 회수되어 배란이 광범위한 시간대에 일어나고 있음을 나타내었다. 또한 과배란의 반복적인 유도에 의해 난소의 혈포수는 증가하였으나 채란된 난자의 채외배양에 의한 발육율에는 차이가 없었다. 그러므로 과배란의 반복적인 유도는 공란토의 난소반응에는 영향을 미쳤으나 난자의 질에는 영향을 미치지 않았음을 나타낸다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.10
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• pp.814-822
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• 2018

This paper proposes a guidance law for missiles with control time constraint. Because the proposed guidance law is based on a time-to-go polynomial, it has a generalized form. Also, acceleration of the proposed law converges to zero at the end of the control time, which reduces the sensitivity to the time-to-go estimation error and can increase the flight stability when the separation of the missile appears. A prediction method of the time-to-go is proposed for implementing the proposed law, and the possibility of application to the midcourse and terminal guidance phases is dealt with for exoatmospheric interception. The characteristics and performance of the proposed law are analyzed throughout various simulations.