• 한국재난정보학회 논문집
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• 제15권1호
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• pp.39-48
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• 2019

연구목적:본 연구에서는 재난현장 또는 산업현장에 투입되는 고위험 직업군의 안전을 위하여 IoT/ICT 융합기반의 스마트 안전관리 시스템을 연구하고 이의 성능을 분석 제시하였다. 연구방법: 연구에서 제시된 고위험 직업군의 안전을 위해 부동상태 감지센서, 각 대원간에 통신을 위한 LoRa기반의 리피팅 기술, 전체를 모니터링할 수 있는 LoRa Gateway를 개발하여 기능을 테스트하여 현장적용을 위한 기반을 제시하였다. 연구결과 :고위험 직업군에 작업현장에서 작업자의 위험 상태를 감지하고 전파할 수 있는 다양한 요소를 파악하고 이에 대한 연구가 진행되었다. 작업자의 부동과 같은 위험상태를 감지하는 센서기술, LoRa 통신 기반의 리티핑 기술, 위험 상황을 실시간으로 모니터링 할 수 있는 LoRa Gateway를 분석하여 그 연구결과를 제시하였다. 특히 통신 음영지역의 최소화를 위한 단말간 리피팅기술을 연구하여 통신 불통 문제를 감소시켰다. 연구결론:본 연구를 통해 다양한 고위험 직업군의 작업자 안전을 위한 스마트 안전관리 시스템의 중요한 기능적 요소를 고찰하고 그 효용성을 검증하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권7호
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• pp.2377-2398
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• 2021

In the recent modernized world, utilization of natural resources (renewable & non-renewable) is increasing drastically due to the sophisticated life style of the people. The over-consumption of non-renewable resources causes pollution which leads to global warming. Consequently, government agencies have been taking several initiatives to control the over-consumption of non-renewable natural resources and encourage the production of renewable energy resources. In this regard, we introduce an IoT powered integrated framework called as green home architecture (GHA) for green score calculation based on the usage of natural resources for household purpose. Green score is a credit point (i.e.,10 pts) of a family which can be calculated once in a month based on the utilization of energy, production of renewable energy and pollution caused. The green score can be improved by reducing the consumption of energy, generation of renewable energy and preventing the pollution. The main objective of GHA is to monitor the day-to-day usage of resources and calculate the green score using the proposed green score algorithm. This algorithm gives positive credits for economic consumption of resources and production of renewable energy and also it gives negative credits for pollution caused. Here, we recommend a green score based tax calculation system which gives tax exemption based on the green score value. This direct beneficiary model will appreciate and encourage the citizens to consume fewer natural resources and prevent pollution. Rather than simply giving subsidy, this proposed system allows monitoring the subsidy scheme periodically and encourages the proper working system with tax exemption rewards. Also, our GHA will be used to monitor all the household appliances, vehicles, wind mills, electricity meter, water re-treatment plant, pollution level to read the consumption/production in appropriate units by using the suitable sensors. These values will be stored in mass storage platform like cloud for the calculation of green score and also employed for billing purpose by the government agencies. This integrated platform can replace the manual billing and directly benefits the government.

• 지식경영연구
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• 제23권4호
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• pp.233-250
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• 2022

본 연구는 호텔 기업의 지식공유문화가 MZ 세대 종사원의 지식공유를 매개로 심리적 주인의식, 조직시민행동에 어떤 영향을 미치는지 검증하고자 한다. 또한 추가적으로 암묵지와 형식지 등 두가지 지식유형에 따른 각기 다른 경영전략이 지식공유문화와 지식공유를 조절하는 효과가 있을 것이라 가정하였다. 수도권 호텔에 종사하는 종사원 138명을 대상으로 데이터 수집 후 실증분석을 수행한 결과 호텔 기업의 지식공유문화는 지식공유에 영향을 주는 것으로 나타났으며, 더 나아가 심리적 주인의식과 조직적시민행동에도 유의한 영향을 미치는 것으로 확인되었다. 또한, 호텔 기업의 경우 형식지 지향 전략보다 암묵지 지향 전략이 종사원들의 지식공유를 유도하는데 효과적인 것을 보아 기업이 다양한 형태의 암묵지 전략을 이용하여 지식공유문화를 제공한다면 MZ세대 종사원의 조직 시민행동과 심리적 주인의식을 높일 수 있을 것으로 예상된다.

• International journal of advanced smart convergence
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• 제4권1호
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• pp.104-113
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• 2015

This paper focuses on a temperature effects on a PV panel which has been installed in Thailand. The main objective is cleaning PV panels and reduce temperature of PV panel by water injects from waterway and experimental results of PV power what it is difference. This project is designed by PLC control system which water injects and control PV temperature, In addition, this project consists of hardware and software such as water pump, water injection and PLC control has been automatically and it can be control system manually. The automatic control system is working when PV temperature rises up over 45 degree Celsius after that the pumping machine would inject water to the surface of PV panels and it must be stop when the PV panel temperature comes down less than 45 degree Celsius. The result of actual experimental found that the control system has been done correctly under specify condition. The experimental has been shown electrical data before and after water injects on PV system found that the electrical power a bit increases and The energy has been taken from PV panel less than energy consumption equipment of control system which taken to operate the water injecting system.

• 한국인터넷방송통신학회논문지
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• 제12권2호
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• pp.243-249
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• 2012

요즈음 전자의무기록시스템을 구축하는 한방 병원이 많아지고 있다. 특히 질병을 과학적으로 진단하기위해서, 한방 병원에서는 맥진기가 개발되고 있다. 그러나, 한방 진료 체제는 아직까지 정확한 병명을 유추하기가 매우 어려운 실정이다. 이러한 문제점을 해결하기 위해서, 본 논문에서는 맥진 및 설진을 동시에 사용 가능한 EMR 챠트 시스템을 제안하였다. 그러므로 본 논문에서는 이러한 문제점을 해결하기위해서, 지능형 전자 챠트 시스템을 이용한 EMR 시스템을 제안하였다. 컴퓨터 모의실험 결과 EMR을 설치한 병원이 기존의 병원보다 편리하고 정확한 진단을 할 수 있음을 확인 하였다.

• International journal of advanced smart convergence
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• 제8권4호
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• pp.34-39
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• 2019

Millimeter-wave (mmWave) and Non-orthogonal multiple access (NOMA) are expected to be the major techniques that lead to the next generation wireless communication. NOMA provides a high spectrum efficiency by sharing of spatial resources among users in the same frequency band. Meanwhile, millimeter-wave gives a huge underutilized bandwidth at extremely high frequency band (EHF) which covers 30GHz to 300GHz. These techniques have been proven in several recent literatures to achieve high data rates. The combination of NOMA and millimeter-wave techniques further improves average sum capacities, as well as reduces the interference compared to conventional wireless communication systems. In this paper, we focus on hybrid NOMA system working in millimeter-wave frequency. We propose a clustering algorithm used for a hybrid NOMA scheme to optimize the usage of wireless resources. The proposed clustering algorithm adds several conditions in grouping users and defining clusters to increase the probability of the successful superposition decoding process. The performance of the proposed clustering algorithm is investigated in hybrid NOMA system and compared with the conventional orthogonal multiple access (OMA) scheme.

• 제어로봇시스템학회논문지
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• 제21권4호
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• pp.385-390
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• 2015

Quay cranes are considered core equipment for container terminal operation. However, unmanned operation systems have not as yet been announced due to the technological difficulties of implementation. In this paper, we developed a wireless controller to control a quay crane simulator remotely and conducted its performance test, a first step toward unmanned operation of quay cranes. The communication delay of a developed wireless controller was about 9.4ms on average while that of existing wired controllers was about 5.6ms. The same functions were implemented and tested on a smart phone where the average communication delay was 7.3ms. In addition, to apply the developed system into a real environment, we proposed a network architecture based on IEEE 802.11ac and carried out its performance evaluation. When the distance between two nodes was 50m apart, the throughputs of the TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) were 57Mbps and 189Mbps, respectively. The communication delay of the control data was 9.1ms through the TCP channel. These results reveal the proper working of remote quay crane operation if we adopt the IEEE 802.11ac network.

• 소성∙가공
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• 제7권3호
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• pp.246-259
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• 1998

This paper describes a research work of developing a computer-aided design and manufacturing of irregular shaped sheet metal product for blanking or piercing and bending operations. An approach to the system is based on the knowledge-based rules. Knowledge for the system is formulated from plasticity theories experimental results and the empirical knowledge of field experts, This system has been written in AutoLISp on the AutoCAD and in customer tool kit on the SmartCAM with a personal computer and is composed of nine modules which are input and shape treatment, flat pattern-layout, pro-processor module. Based on the knowledge-based rules, the system is designed by considering several factors, such as material and thickness of product complexities of blank geometry and punch profile sheet metal to give flat pattern and automatically account for the adjustment of bending allowances to match tooling requirements by checking dimensions and generating NC data automatically according to drawings of die-layout module. Results carried out in each module will provide efficiencies to the designer and the manufacturer of blanking or piercing and bending die in this field.

• Journal of Power Electronics
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• 제11권2호
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• pp.163-172
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• 2011

Oxidation models of a rotor bar and end ring segment in an induction motor are presented to simulate the behavior of an induction machine working with oxidized rotor parts which are modeled as rotor faults in progress. The leakage inductance and resistance of the rotor parts arc different from normal values because of the oxidation process. The impedance variations modify the current density and magnetic flux which pass through the oxidized parts. Consequently, it causes the rotor asymmetry which induces abnormal harmonics in the stator current spectra of the faulty machine. The leakage inductances of the oxidation models are derived by the Ampere's law. Using the proposed oxidation models, the rotor bar and end ring faults in progress can be modeled and simulated with the motor current signature analysis (MCSA). In addition, the oxidation process of the rotor bar and end ring segment can motivate the rotor asymmetry, which is induced by electromagnetic imbalances, and it is one of the major motor faults. Results of simulations and experiments are compared to each other to verify the accuracy of the proposed models. Experiments are achieved using 3.7 kW, 3-phase, and squirrel cage induction motors with a motor drive inverter.

• 한국콘텐츠학회논문지
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• 제13권12호
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• pp.379-388
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• 2013

유헬스케어 서비스는 미래의 서비스로 각광받고 있음에도 불구하고 그 도입이 기대보다 느리게 진행되고 있다. 본 연구는 유헬스케어 서비스의 활성화를 위한 요소를 파악하기 위해 의료기관 종사자들의 이용의도를 성과기대와 노력기대, 사회적 영향, 촉진조건, 그리고 인지된 위험과 조절변수인 자발성으로 설명하고자 한다. 국내 의료기관의 종사자 98명으로부터 설문조사를 통해 자료를 수집해서 분석했는데, 촉진조건을 제외한 성과기대와 노력기대, 사회적 영향, 인지된 위험이 이용의도에 통계적으로 유의한 영향을 주는 것으로 확인되었다. 자발성은 성과기대와 노력기대, 인지된 위험이 이용의도에 미치는 영향의 강도를 조절하는 것을 알 수 있었다.