• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.33 no.3
• /
• pp.71-77
• /
• 2005

An unmanned aerial vehicle (UAV) is generally flied via a pre-planned flight path or real-time commands by an operator. To succeed in an assigned mission, analysis such as the line-of-sight analysis for communication between UAV and a ground data terminal should be performed. In this paper, various analysis algorithms which are performed by a ground control station in pre-flight and in-flight phases, are proposed for the safe flight of UAV. Note that the proposed algorithms can be applied to most UAV systems.

• Journal of Conservation Science
• /
• v.31 no.3
• /
• pp.299-308
• /
• 2015

Aim of this study is to identify dyestuff of the Dallryeong(official's robe in Joseon Dynasty, 16th century) excavated from Yuryang-dong, Cheonan, in 1996. For this purpose, extracted dyestuffs from Dallryeong fabric and from natural dyestuffs for red color(safflower, Sapanwood, Madder) which are presumed to have been used in the Dallryeong, are analyzed and compared by high performance liquid chromatography(HPLC). As a result, HPLC chromatogram of extracts of the Dallryeong's dyestuff and safflower are showed a peak at 17.5 minutes. The UV/Vis spectra of the samples are showed the maximum absorption wavelength at 519nm. This result is identical with the analysis of the previous studies on red dyestuff of safflower. In addition, the analysis of Mass Spectrometry(MS) showed the identical result of the peak with m/z 910. Following these results, excavated pink Dallryeong were considered to have been dyed with safflower.

• Parasites, Hosts and Diseases
• /
• v.36 no.2
• /
• pp.69-80
• /
• 1998

Subgenus classification of Acanthcmoeba remains uncertain. Twenty-three reference strains of Acanthnmoeba including 18 (neo)type-strains were subjected for classification at the subgenus level by riboprinting, PCR/RFLP analysis of 185 rRNA gene (rDNA) . On the dendrogram reconstructed on the basis of riboprint analyses, two type- strains (A. astronwxis and A. tubinshi) of morphological group 1 diverged early from the other strains and were quite distinct from each other. Four type-strains of morphological group 3. A. culbertsoni, A. polestinensis, A. healyi were considered taxonomically valid, but A. pustulosn was regarded as an invalid synonym of A. pclestinensis. Strains of morphological group 2 were classified into 6 subgroups. Among them, A. giulni which has an intron in its 185 rDNA was the most divergent from the remaining strains. Acanthcmoebc ccstellanii Castellani, A. quinc Vil3, A. Iugdunensis L3a. A. poIyphage Jones, A. trinngularis SH621, and A. cqstellanii Ma strains belonged to a subgroup, A. castellanii complex. However, A. quinc and A. Lugnunensis were regarded as synonyms of A. ccstellanii. The Chang strain could be regarded as A. hatchetti. Acanthcmoebo nauritaniensis, A. niuionensis, A. paranivionensis could be considered as synonyms of A. rhwsodes. Neff strain was regarded as A. polyphage rather than as A. castellanii. It is likely that riboprinting can be applied for rapid identification of Acnnthcmoebc isolated from the clinical specimens and environments.

• Journal of Korea Society of Industrial Information Systems
• /
• v.21 no.4
• /
• pp.95-110
• /
• 2016

The purpose of this study is to design a service encounter of a duty free shop using a blueprinting method. This case study analyzed differences between city-based and airport-based duty free shop and proposed a flow chart based on administration blueprinting of the duty free shop in South Korea. The paper presented process criteria based on administrative procedures of customers in city-based and airport-based duty free shop. The results of the study provided the cause of failure with waiting point of customer and customer service and suggested management plan to solve failure. Also, the study addressed more customer-oriented service delivery processes to improve service quality and customer satisfaction through waiting and failure points.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2012.01a
• /
• pp.169-170
• /
• 2012

현대전에서는 인명 손실을 최소화하는 동시에 타 전투체계와의 연계를 통해 부여된 임무를 성공적으로 이끌어 내기 위해 무인로봇을 활발하게 이용하고 있다. 본 논문에서는 미래 전장에서 중심 역할을 수행할 것으로 기대되는 무인로봇과 통제장치의 기능을 제안한다. 통제장치는 디지털 지도를 기반으로 무인로봇의 위치를 전시하는 동시에 특정 위치로의 자율 이동 명령을 내리게 하는 인터페이스이다. 통제장치에서 무인로봇의 실시간 이동 간에 디지털 지도 기반 가시선(line of sight) 분석을 수행함으로써 통신 가능지역 식별 및 중계기를 통한 통신 가능 영역 식별을 용이하게 한다. 제안한 무인로봇과 통제장치를 통해 전장 환경에서 부여된 작전을 성공적으로 이끄는데 주된 역할을 수행할 것으로 기대한다.

• Journal of the Korean Chemical Society
• /
• v.53 no.5
• /
• pp.565-569
• /
• 2009

The interaction between polyvinylpyrrolidone(PVP) and silver cation has been studied in water at room temperature and atmospheric pressure. The PVP and PVP/Ag composite was observed by transmission electron microscopy (TEM), UV-VIS absorption spectroscopy, Raman spectroscopy and oxygen/carbon dioxide analyzer. We identified silver cations interacting with nonbonding electrons of the oxygen atom in the carbonyl group of PVP. It was shown that PVP/Ag formed stable composites.

• Proceedings of the Materials Research Society of Korea Conference
• /
• 2003.03a
• /
• pp.207-207
• /
• 2003

최근 광촉매 재료로 각광받고 있는 TiO$_2$는 band gap 에너지가 3.0-3.2eV로 자외선 영역과 일부 가시광선 영역에서 활성을 갖는 것으로 알려져 있다. 따라서 용액 중에 결정화 및 안정화 되어있는 TiO$_2$의 band gap 에너지를 낮춘다면 가시광 영역의 광반응을 얻을 수 있다. 이에 본 연구는 G. Sato등이 제안한 방법으로 TiO$_2$ sol을 제조할 때 band gap 에너지를 낮추고자 천이 금속원소를 첨가하여 복합 및 담지된 TiO$_2$계 복합 sol을 합성하고자 하였다 출발원료는 TiC1$_4$를 가수분해하여 제조한 TiOCl$_2$에 천이금속원소인 V, Cr, Fe, Ni, Nb 등의 chloride 화합물을 첨가하여 중화 및 세척과정을 거친 후, 과산화수소수에 용해하여 전구체 용액인 titania peroxo용액을 제조하였다 제조된 전구체 용액은 온도와 시간을 변수로 각각 열처리하여 TiO$_2$계 복합 sol을 합성하였다. 제조된 시편은 X-선 회절 분석, 투과전자현미경, particle size analyzer, ζ-potential analyzer 및 UV-VIS Spectrometer 통을 이용하여 천이금속 첨가에 따른 TiO$_2$계 복합 sol의 형성과정과 특성변화를 관찰하였다.

• Journal of the Korean Society for Aeronautical & Space Sciences
• /
• v.41 no.12
• /
• pp.950-958
• /
• 2013

The Lunar orbiter is expected to be inserted into a ~300km low Earth orbit using Korea Space Launch Vehicle-II(KSLV-II). After the states are successfully determined with obtained tracking data, the Trans Lunar Injection(TLI) burn has to be done at appropriate epoch to send the lunar orbiter to the Moon. In this study, we describe in detail the mission scenario of the Korean lunar orbiter from the launch at NARO Space Center to lunar orbit insertion(LOI) stage following direct transfer trajectory. We investigate the launch window including launch azimuth, delta-V profile according to TLI and LOI burn positions. We also depict the visibility conditions of ground stations and solar eclipse duration to understand the characteristics of the direct transfer trajectory. This paper can be also helpful not only for overall understanding of ${\Delta}V$ trend by changing TOF and coasting time but for selecting launch epoch and control parameters to decrease fuel consumption.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
• /
• v.3 no.4
• /
• pp.41-48
• /
• 1989

두 분광선의 상대휘도를 이용하는 분광 분석법에 의하여 고압 수은등의 온도분포를 측정하였다. 관경 방향의 휘도분포를 구하기 위해 측정된 분광휘도를 Abel변환을 수행하여 관경방향의 분광휘도로 변환하였다. 사용된 온도결정법은 LTE가 성립한다는 가정하에 같은 종류의 원자로부터 방사되는 두 분사광선의 상대휘도 비교에 의한 절대온도 결정법이고 가시광선 영역에 존재하는 수은의 분광선들 중 두가지 조합이 사용되었다. 250W 고압 수은등으로 실험한 결과 6300[K]까지의 축 중심부 온도가 측정되었으며 아아크의 수축현상이 잘 관찰되었고 중심에서 5[mm]까지의 영역에서 LTE가 성립함을 실험적으로 확인하였다. 본 논문에서 사용한 실험방법이 타당하게 적용될 수 있는 중심 부근에서의 온도분포는 이단계(two-step) 온도분포에 근사함을 알 수 있었다.

• Journal of the Institute of Electronics and Information Engineers
• /
• v.50 no.9
• /
• pp.46-51
• /
• 2013

In this paper, the optimum placement and shape of UHF antenna on the unmanned aerial vehicle (UAV) are analyzed by using the electromagnetic (EM) simulation on the various locations. The FEKO was used for the EM-simulation. In order to reduce the complexity of simulation and minimize the runtime and memory usage, the composite aircraft structure is simplified as the PEC model excluding the radome structure. The simulation was performed on the wing and ventral fin of UAV, and the antenna shape used the monopole, dipole, and bent monopole antennas. When the monopole antenna is mounted under the wing, two antennas need to be mounted under the right and left wings, and those antennas have to be switched as the direction of UAV wing to the line of sight (LOS) data-link (DL) ground antenna. In the case of mounting under the ventral fin, one antenna can be used regardless of the direction of UAV wing to the LOS DL ground antenna. Also, the antenna gain is improved by the blockage reduction. The antenna gain is further improved by using the bent monopole antenna. The optimum solution of UHF antenna placement and shape on UAV is to mount the bent monopole antenna under the ventral fin.