• 한국실내디자인학회논문집
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• 제25권5호
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• pp.71-81
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• 2016

This research has been carried out with the objects of sporting goods shops to find out what structure of those shops raises more interest from customers. The tracking eyes on the objects which are the same but seen to have different structures has revealed the followings. Customers' visual appreciation of Reverse left/right Images (11.1) was found to be higher than that of Original Images (10.6). Furthermore, the reverse left/right image of the space also was found to attract more interest from customers, which led them to have longer observation. The below is about the interpretation of the spatial exploration by observation time and the appreciation of its visual content in line with the experiment objects of selling spaces. The longer the space was observed, (1)the higher the expansive searching of space was, (2)the more spots were observed as if they did not know what to see after they first observed at early hours, (3)later (in the time range of 64~73 seconds) they came to look at the spots in which they got interested, (4)and then again they suddenly got lost what to see. When the change of observation characteristics by time range is reviewed, it can be seen that the searching of original images is changed from Divergent Feature to Convergent Feature when the observation time increases from the early stage of observation to the later. On the contrary, the reverse left/right images were found to have the opposite searching features, that is, from convergent exploration to divergent exploration. These findings show that the reverse left/right images of the sporting goods shops, which were the experiment objects, have more factors attracting customers' attention and interest and that it is the very shop-structure which makes customers have better visual appreciation of those shops.

• 조명전기설비학회논문지
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• 제21권1호
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• pp.28-34
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• 2007

본 연구에서는 새로 고안된 방전 논리 게이트 PDP의 논리 게이트 입력인 DC 방전특성에 대해 고찰하였다. 새로 고안된 방전 논리 게이트는 방전 경로에 따른 전극사이의 전위차를 제어하여 논리 출력을 유도한다. 실험결과 이 DC 방전들의 안정성을 위해 프라이밍 방전을 인가한 경우가 인가하지 않은 경우에 비해 방전지연시간이 1/3로 단축되며 방전개시전압은 1/2로 감소하였다. 또한 이 프라이밍 방전에서 발생한 공간전하는 방전종료 후 $30[{\mu}s]$ 정도까지 영향을 미친다. 그리고 시간적, 공간적 거리변화에 파라 공간전하가 DC 방전에 미치는 영향을 측정한 결과, 주 방전에서부터 시간적으로 멀어지는 것보다 공간적으로 멀어지는 것이 주 방전의 영향에서 쉽게 벗어날 수 있음을 알았다. 그러므로 각 주사전극 마다 방전 논리 게이트들을 독립적으로 동작시킬 수 있다는 결론을 얻었다.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1612-1616
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• 2005

In this paper, a Home Mess-Cleanup Robot(HMR), which has a practical function of the automatic mess-cleanup, is developed. The vacuum-cleaner had made the burden of house chore lighten but the operation labour of a vacuum-cleaner had been so severe. Recently, the cleaning robot was producted to perfectly solve the cleaning labour of a house but it also was not successful because it still had a problem of mess-cleaning, which was the clean-up of big trash and the arrangement of newspapers, clothes, etc. The cleaning robot is to just vacuum dust and small trash but has no function to arrange and take away before the automatic vacuum-cleaning. For this reason, the market for the cleaning robot is not yet built up. So, we need a design method and technological algorithm of new automatic machine to solve the problem of mess-cleanup in house. It needs functions of agile automatic navigation, novel manipulation system for mess-cleanup. The automatic navigation system has to be controlled for the full scanning of living room, to recognize the absolute position and orientation of the self, the precise tracking of the desired path, and to distinguish the mess object to clean-up from obstacle object to just avoid. The manipulator, which is not needed in the vacuum-cleaning robot, must have the functions, how to distinguish big trash to clean from mess objects to arrange, how to grasp in according to the form of mess objects, how to move to the destination in according to mess objects and arrange them. We use the RFID system to solve the problems in this paper and propose the reading algorithm of RFID tags installed in indoor objects and environments. Then, it should be an intelligent system so that the mess cleaning task can be autonomously performed in a wide variety of situations and environments. It needs to also has the entertainment functions for the good communication between the human and HMR. Finally, the good performance of the designed HMR is confirmed through the results of the mess clean-up and arrangement.

• 대한전자공학회논문지SD
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• 제43권11호
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• pp.14-18
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• 2006

광간섭계는 물체의 기하학적 구조 및 의료 계측등 다양한 분야의 광계측에서 매우 일반적으로 사용된다. 이러한 광간섭계에서 광지연단은 측정대상의 기준을 위해 사용되고. 광간섭계의 계측속도는 광지연단에 의해 제한된다. 본 논문에서는 고속 광지연단을 위해 기존의 기계적 방식을 배제하고, 광학적 방식의 광 간섭계를 구성하였다. 고속 광간섭계의 구성은 1304nm의 10GHz광원을 이용하였으며, 광지연단으로 광위상변조기와 광섬유를 이용하여 안정적이고 고속의 광 간섭계를 구성하였다. 구성된 광간섭계는 광위상변조기의 변조전압, 변조주파수에 의해 광지연시간을 가변할 수 있으며, 10MHz 반복율에 대해 11ps의 광지연시간을 얻을 수 있었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2006년도 춘계학술대회 논문집
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• pp.197-198
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• 2006

In the solid freeform fabrication (SFF) system using selective laser sintering (SLS), polyamide-12 powder is currently recognized as general material. In this study, some kinds of polyamide-6 powders with different shape and particlesize were fabricated to investigate the formability, the microstructure and mechanical properties. Also, to develop a more elaborate and rapid system, this study employs a new SLS device with a 3-axis dynamic focusing scanner system instead of the existing fe lens used in commercial SLS. Polyamide-6 powders having the average size of 100 m were treated thermally in order to keep the spherical symmetry in shape. These polyamide-6 powders were mixed with polyamide-12 powders having the average size of 50 m to give the bimodal distribution of size. These mixed powders showed the better fabrication in the selective laser sintering process because the smaller particles of polyamide-11 played an important role in the compact packing of powders by filling the void space between the large particles of polyamide-6. Also, Experiments have performed to evaluate the effect of a scanning path and sintering parameters by fabricating the various 3D objects.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.158-158
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• 2009

The electrophoretic deposition(EPD) technique with a wide range of novel applications in the processing of advanced ceramic materials and coatings, has recently gained increasing interest both in academic and industrial sector not only because of the high versatility of its use with different materials and their combinations but also because of its cost-effectiveness requiring simple apparatus. Compared to other advanced shaping techniques, the EPD process is very versatile since it can be modified easily for a specific application. For example, deposition can be made on flat, cylinderical or any other shaped substrate with only minor charge in electrode design and positioning[1]. The synthesis of the nano-sized Ce0.2Sm0.8O1.9(SDC)particles prepared by aurea based low temperature hydrothermal process was investigated in this study[2].When we made the SDC nanoparticles, changed the time of synthesis of the SDC. The SDC nanoparticles were characterized with field-emission scanning electron microscope(FESEM), energy dispersive X-ray analysis(EDX), and X-ray diffraction(XRD). And also we researched the results of our investigation on electrophoretic deposition(EPD) of the SDC particles from its suspension in acetone solution onto a non-conducting NiO-SDC substrate. In principle, it is possible to carry out electrophoretic deposition on non-conducting substrates. In this case, the EPD of SDC particles on a NiO-SDC substrate was made possible through the use of a adequately porous substrate. The continuous pores in the substrates, when saturated with the solvent, helped in establishing a "conductive path" between the electrode and the particles in suspension[3-4]. Deposition rate was found to increase its increasing deposition time and voltage. After annealing the samples $1400^{\circ}C$, we observed that deposited substrate.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.286-287
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• 2012

Reset-first resistive switching mechanism based on reduction reaction in HfO2-x with oxygen drift-diffusion was studied. we first report that the indirect evidence of local filamentary conductive path formation in bulk HfO2 film with local TiOx region at Ti top electrode formed during forming process and presence of anion-migration at interface between electrode and HfO2 during resistive switching through high resolution transmission electron microscopy (HRTEM), electron disperse x-ray (EDX), and electron energy loss spectroscopy (EELS) mapping. Based on forming process mechanism, we expected that redox reaction from Ti/HfO2 to TiOx/HfO2-x was responsible for an increase of initial current with increasing the post-annealing process. First-reset resistive switching in above $350^{\circ}C$ annealed Ti/HfO2 film was exhibited and the redox phenomenon from Ti/HfO2 to TiOx/HfO2-x was observed with high angle annular dark field (HAADF) - scanning transmission electron microscopy (STEM), EDX and x-ray photoelectron spectroscopy. Therefore, we demonstrated that the migration of oxygen ions at interface region under external electrical bias contributed to bipolar resistive switching behavior.

• 한국안광학회지
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• 제11권2호
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• pp.85-89
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• 2006

렌즈 절삭공구의 기계적 특성을 향상시키는 기구에 관한 연구를 하기 위해, 탄화규소와 탄화티타늄을 주재료로 사용되었다. 또한, 소결첨가제로 알루미나와 이트리아를 첨가하였다. 첨가제 조성비는 알루미나와 이트리아비를 1:1로 유지하였다. 이를 $1810^{\circ}C$에서 1시간 일축가압 소결 후 $1860^{\circ}C$에서 3, 6 그리고 12시간 동안 열처리하였다. 열처리 시간이 길어질수록 입자크기는 점점 증가하였다. 미세구조는 주사전자현미경으로 관찰하였으며 이미지프로그램(Image-Pro Plus, Media Cybernetics, Maryland, U.S.A.)으로 상분석 하였다. 파괴기구는 주로 길게 자란 탄화규소 입자에 의한 균열회절에서 일어나고 있음을 알 수 있다. 균열회절기구에 영향을 미친 SiC입자들은 대부분 두께가 $2.3{\mu}m$ 이하였고, 장경비는 2.5 이상이었다. 균열가교도 일부 파괴인성 증진기구에 기여함을 알 수 있다.

• 한국정보통신학회논문지
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• 제17권5호
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• pp.1070-1075
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• 2013

본 논문에서는 실내 보안지역내의 인간 출입을 통제하기위해 보안로봇을 이용한 출입통제 기능을 수행한 시스템 및 연구결과를 제시하고 있다. 제안된 로봇은 환경인식을 위한 레이저파인더를 탑재하고 보안지역을 상시 관찰을 수행하며 출입금지 구역에 인간을 출입이나 진행을 감지했을 때, 로봇이 인간의 속도벡터를 계산 및 주행할 경로를 계획하고 인간의 진행방향을 차단할 수 있도록 예측된 경로를 따라 주행을 하게 된다. 이때, 인간의 움직임은 포인터 물체로 간주하였으며 로봇의 기구학에 기반하여 인간의 위치를 추정한다. 실내에서 계속적인 환경변화에 대해 로봇은 감시기능 수행하게 된다. 통제구역에 대한 진입을 인식하게 되면 인간의 움직임의 반대방향으로 주행하여 진입차단 기법을 제시한다. 제안된 연구결과를 검정하기위해 로봇을 이용한 위치추정 및 추적 실험결과를 제시하였다.

• 한국지반공학회논문집
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• 제33권9호
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• pp.61-69
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• 2017

본 연구에서는 사질토에서의 EICP에 의한 탄산칼슘 침전량을 정량적으로 평가하였다. 생성된 탄산칼슘은 염산과의 반응에 수반되는 이산화탄소 기체 압력 증분을 통해 간접적으로 측정하였으며, 이는 반응이 진행됨에 따라 특정 값으로 수렴하는 경향을 보였다. EICP 용액으로 포화된 주문진표준사의 전단파 속도 및 전기전도도값은 측정된 탄산칼슘량의 수렴시간보다 선행하여 일정한 값에 도달함을 확인하였다. 결정화 모델은 탄산칼슘이 흙 입자간 접촉점과 입자표면에서 생성됨을 나타내며, 이를 통해 최종 전단파 속도 및 최종 전기전도도에 도달하는 시간과 탄산칼슘 생성량의 수렴시간 간의 불일치가 설명 가능함을 보였다. 또한, 용액 농도 0.5g/L를 이용한 최종 전단파 속도는 0.1g/L의 것보다 224% 높은 효율을 나타내었다. 더불어 효소의 농도와 무관하게 전기전도도와 전단파 속도의 상관관계가 있음을 확인하였으며 주사전자현미경과 X-ray CT 이미지 분석을 통해 생성된 탄산칼슘의 공간적 분포를 확인하였다.