• 대한전자공학회논문지
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• 제24권2호
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• pp.292-300
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• 1987

This paper, realizes the design of the sequential controller of a reinforced warehousing-delivery and unmanned transportation system for automated warehouse system. The system is composed of ware housing delivery adn transportation system using two unmanned vehicles with hierachical structure. It is described by GRAFCET and realized by programmed logic with microprocessor. Being described by GRAFCET, the system is able to divide it into subsystems and to synchronize them. Defining the concept of program module, one can easily program the system with the microprocessor instruction language.

• 전자공학회논문지CI
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• 제47권3호
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• pp.76-82
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• 2010

본 논문은 수치적인 입출력데이터로부터 언어적인 규칙을 생성시키기 위한 체계적인 접근방법으로써 정보입자(information granules)에 근거한 언어적인 모델(LM: Linguistic Model)을 발전시킨다. Pedrycz에 의해 소개된 언어적인 모델은 컨텍스트 기반 퍼지 클러스터링(CFC: Context-based Fuzzy Clustering)으로부터 얻어지는 퍼지 정보입자에 의해 수행되어지며, 이는 입력과 출력공간과 연관된 클러스터 된 데이터들의 동질성을 보존하도록 클러스터를 추정한다. 언어적인 모델의 효능성은 이전 연구에서 이미 증명되었음에도 불구하고 성능 측면에서 개선시킬 필요성이 있다. 따라서, 본 논문에서는 기존 언어적인 모델의 근사화와 일반화 성능을 모두 향상시키기 위해 언어적인 컨텍스트의 자동적인 생성, 바이어스항의 추가, 결론부 파라미터의 변형된 구조를 통해 이루어진다. 실험결과는 자동차 연료소비량 예측문제와 보스턴 housing 데이터를 통해 제안된 방법이 언어적인 모델뿐만 아니라 기존 방법들보다 우수함을 증명한다.

• 한국건축시공학회지
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• 제9권2호
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• pp.93-101
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• 2009

Recently, public interest in housing defects, such as construction errors, occupiers' complaints, faults in production, and so on, is increasing. In addition, the construction requirements of high-rise residential buildings have increased, due to the higher prices of urban areas, especially in metropolitan areas. While previous research has focused on the defects occurring in apartment housing complexes, research has not been carried out on the defects occurring in high-rise residential buildings. In this paper, the defects patterns and characteristics of high-rise residential buildings are examined and analyzed and a defect management plan is then suggested. In order to do this, we collected the defects data of high-rise residential buildings recorded by 2,299 of 2,327 occupants. The defect occurrence rate (DOR) in the residential area is 98.8%. The frequency rate of defect occurrence over the total defect occurrence since building completion is 63.28% during the first year, 24.63% (second year), 6.88% (third year), 2.27% (fourth year), and 2.53% (fifth year). The result of correlation analysis between work types showed that there is a relationship between the built-in furniture and electronics (F&E) and painting works, and the F&E and masonry works, such as marble finishing. We expect that this research will assist in the efforts to decrease the number of defects in high-rise buildings.

• 한국공간구조학회논문집
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• 제9권4호
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• pp.89-96
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• 2009

아파트는 우리나라 주거의 반수이상이 공급되어 있으며, 가장 선호하는 주거유형으로 자리매김 되고 있다. 이처럼 주거의 대부분을 차지하고 있는 아파트 내부공간이 최근에는 트렌드 차별차로 다양한 변화를 자랑하고 있지만 기본적인 법적 요구공간과 설계치수만을 적용하고 있는 상황이다. 주거에서 가장 중요한 의미는 가족이 단란하게 생활하는 공간이며 사회생활의 긴장을 완화시키는 기능이라 할 수 있을 것이다. 또한 주거공간은 가족 구성원간 상호작용과 자아정체감을 갖는데 영향을 주고 있으며 공간의 기본조건 중 능률성은 동선과 사용공간, 가전제품, 가구치수는 주거공간의 면적과 칫수에 영향을 미치고 있다. 아파트의 내부공간구조 자체가 서구에서 도입된 형태로 우리나라의 신체적 치수적용에 부조화를 초래하였으며 최근에는 다시 인체치수의 변화로 이와 관련하여 대한 건축계획에서도 적절한 주거공간의 구성을 위한 인체공학적 적합성에 근거한 주거공간 계획 기준을 제시하고자 한다.

• ETRI Journal
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• 제35권3호
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• pp.534-537
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• 2013

A compact monopole antenna excited by a conductor-backed coplanar waveguide (CBCPW) is developed for wireless USB dongle applications. The proposed antenna has a compact dimension of $14mm{\times}47.4mm{\times}3.5mm$, which is suitable for a USB dongle housing. A slotted elliptical patch and a CBCPW with vertical vias are employed to achieve a further size reduction and an improved impedance bandwidth. The measurement result demonstrates that the fabricated antenna resonates from 2.25 GHz to 10.9 GHz, which covers all of the important wireless communication bands, including WiBro (2.3 GHz to 2.4 GHz), Bluetooth (2.4 GHz to 2.484 GHz), WiMAX (2.5 GHz to 2.7 GHz and 3.4 GHz to 3.6 GHz), satellite DMB (2.605 GHz to 2.655 GHz), 802.11b/g/a WLAN (2.4 GHz to 2.485 GHz and 5.15 GHz to 5.825 GHz), and ultra-wideband (3.1 GHz to 10.6 GHz) services. The radiation characteristics of the proposed antenna when attached to a laptop are tested to investigate the influence of the keypad and the LCD panel of the laptop.

• 한국전기전자재료학회논문지
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• 제27권10호
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• pp.673-677
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• 2014

In this paper, thermal analysis of HDU (Heat Dissipation Unit) for infrared CCTV is performed by using SolidWorks Simulation (Thermal analysis) package, in order to change the part materials and HDU shape is optimized. Furthermore, HDU disperses the aggregated heat around the LED inside the housing. The junction temperature of infrared LED checked by HDU check was $65.83^{\circ}C$, $42.02^{\circ}C$, respectively. In addition, the Thermoelement by changing the shape of the HDU was possibly designed and equipped with. Comparison with simulation and prototype measurement results, without HDU model was $65.83^{\circ}C$, $61.99^{\circ}C$, respectively. In addition to with HDU model was $42.02^{\circ}C$, $39.01^{\circ}C$, respectively. Only HDU mounted into infrared CCTV is usable in the ordinary house or outdoors. Also HDU with thermal element, fan mounted into infrared CCTV is usable in a blast furnace workplace or high temperature workplace.

• 한국전자파학회논문지
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• 제17권3호
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• pp.239-248
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• 2006

본 논문에서는 pHEMT(pseudo-morphic High Electron Mobility Transistor)로 구성된 저잡음 증폭기 MMIC(Monolithic Microwave Integrated Circuit)를 이용하여 극저온에서 동작하는 전파 망원경 수신기 전단부용 22 GH2 대역 저잡음 증폭기 모듈을 설계, 제작하였다. pHEMT MMIC 선정에는, 극저온에서의 동작이 입증된 pHEMT 공정을 사용하여 제작된 저잡음 증폭기 MMIC를 선택하였다. 선정된 2개의 MMIC는 박막(thin film) 세라믹 기판에 장착하여 모듈화 하였다. 모듈화 시 하우징(housing)과 캐리어(carrier) 사이의 간극을 제거하고 전파 흡수체를 사용하여 불필요한 구조에 의한 발진을 제거하였다. 또한 커넥터와 기판 사이의 부정합으로 나타나는 잡음 및 이득의 열화를 리본 조정을 통해 개선시켜 상온에서 최적의 성능을 가지도록 했다. 제작된 증폭기 모듈은 상온에서 $21.5{\sim}23.5GHz$ 대역 내 이득 $35dB{\pm}1dB$, 잡음지수 $2.37{\sim}2.57dB$를 보였다. 제작된 증폭기는 헬륨 냉각기를 이용하여 $15^{\circ}K$로 냉각 후 측정 결과, 대역 내에서 이득 35 dB 이상, 잡음온도 $28{\sim}37^{\circ}K$를 얻었다.

• 전력전자학회논문지
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• 제17권5호
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• pp.377-387
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• 2012

A single-phase grid-connected PV system is known as suitable for housing of less than 3 kW. The DC link voltage in a single-phase PV system has necessarily twice component of fundamental wave. It makes high THD in the grid current. According to the problem, power quality is lower. Many engineers have studied about this problem. The most simple method is to use low pass filter on DC link voltage control. However it is affected by DC link voltage control bandwidth. If cutoff frequency is reduced to increase the performance of low pass filter, it also lowers DC link voltage control bandwidth. Second method is using band stop filter, it works good on steady state but not good on transient state. This paper proposes the new method for removing ripple voltage to get an exact current reference. It improves the responses on steady state and transient state. The performance was verified through computer simulation using MATLAB and actual experiments.

• 동력기계공학회지
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• 제17권6호
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• pp.54-62
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• 2013

A numerical analysis is performed to evaluate mass flow balance in the heat exchanger for the dehumidifier. To improve the mass flow balance for maximum heat transfer performance, inlet, outlet and baffle are changed. Mass flow balance is evaluated by non-uniformity of flow which is the same concept with the standard deviation. Usually, there will occur many paths between the inlet and the outlet, however, it will follow shortest and low resistance ways. The uniform distribution of flow is numerically analyzed for several types of heat exchangers. Making the shortest way between the inlet and the outlet is most important factor. Two types of heat exchangers are installed in the dehumidifier and 4 cases of Type A heat exchangers and 3 cases of Type B heat exchangers are evaluated and optimized. The result of this research is applied to design heat exchanger for commercial dehumidifiers.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.1093-1094
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• 2008

A tomography system using microwave multi-channel transceiver was fabricated and measured. The tomography system is applicable to detection of breast cancers in a human body. This system is configured by microwave muiti-channel transceivers, a illumination chamber housing monopole antennas and coupling liquid, and image reconstruction algorithm solving inverse scattering problem.