• 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.

• 한국생활과학회지
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• 제24권4호
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• pp.541-554
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• 2015

In this research in order to grasp the recent research trends of clothing comfort in Korea, 584 theses have been analyzed about the forms, contents and subjects of their researches which have been published in four Korean Journals from 2000 to 2012. The results are as follows: Many of the research contents were on the clothing comfort and environmental adaptation clothes in all journals. Handle, skin temperature, clothing pressure and working clothes showed the highest frequency ln the key words. The review studies were the fewest, and experimental or survey researches were largely conducted. The research forms showed the significant differences according to the research contents. The subjects were largely focused on those aged from 18 to 29, and among the research subjects on clothing comfort, female were more than male. However, in the researches on clothing quantity and clothes wearing conditions, many of them were the studies whose subjects were both men and women. The male and old subjects increased more and more. The number of the theses in the field of clothing environmentology showed the gradually increasing tendency. The most rates were the theses on clothing comfort, but as the number of those on environment adaptation clothes increased more and more, the research contents in the two fields showed much the same. Though the attention to aging and smart clothes is increasing, the research on this is very few. Therefore, it is thought that the study on this field will have to be conducted actively.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2015년도 춘계학술대회
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• pp.724-727
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• 2015

국내 공정들을 살펴보면 시대적으로 첨단화가 진행되어감에 따라, 작업이 보다 다양해지고 복잡해지면서 체계적인 관리시스템의 필요성을 두고 있다. 근대적 공정들은 대부분 관리 시스템을 갖추고 있지만, 일반적인 공정에서는 아직까지 관리시스템의 부재뿐만 아니라, 공정 사이클 또한 보통 경험에 의한 수기 및 구두에 의한 방법으로만 관리되고 있는 실정이다. 이로 인해, 업무가 정체되고, 품질측면에서의 효율성은 더욱 낮아지게 된다. 본 논문에서는 근대적 공정뿐만이 아닌, 일반적인 공정에서도 보다 능률적인 작업 환경을 제공 받을 수 있게 공정관리 시스템을 개발하고자 함에 목적을 두고 공정관리 시스템 설계를 진행하였다.

• 한국복합재료학회:학술대회논문집
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• 한국복합재료학회 2002년도 추계학술발표대회 논문집
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• pp.127-130
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• 2002

The 2.5 vol% TiNi/6061Al composites were fabricated by permanent mold casting, and its microstructures and tensile test for the cold rolled composites with maximum 50% reduction ratio were investigated. In the case of TiNi fiber with 2mm interval in preform, the interface bonding of fabricated composites were good. EPMA analysis results were found the small amount of Mg, Si segregated interface of diffusion layer. Transverse section of TiNi fiber was decreased with increasing reduction ratio and 40% reduction ratio was observed microcrack from TiNi fiber. And the tensile strength of composites at 38% reduction ratio was 194MPa. In the case of over 38% reduction ratio, the decrease of the tensile strength was due to TiNi fiber rupture by excess working. The fracture mode was appeared brittle fracture with increasing reduction ratio

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1998년도 춘계학술대회논문집
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• pp.155-159
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• 1998

This paper describes a research work of developing a computer-aided design and manufacturing (CAD-CAM) of irregular shaped sheet metal product for blanking or piercing and bending operation. An approach to the system is based on the knowledge-based rules. Knowledge for the system is formulated form plasticity theories, experimental results and the empirical knowledge of field experts. This system has been written in AutoLIST on the AutoCAD and in customer tool kit on the SmartCAM with a personal computer and is composed of nine modules. the system is designed by considering several factors, such as material and thickness of product, complexities of blank geometry and punch profile, diameter and material of a wire, and availability of press. This system is capable of unfolding a formed 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 manufacture of blanking or piercing and bending die in this field.