• 한국산학기술학회논문지
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• 제10권8호
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• pp.1839-1842
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• 2009

본 논문에서는 지능형 순항제어 시스템용 24GHz 대역 마이크로스트립 구형패치 배열 안테나의 설계 방법을 제안하였다. 안테나는 송신안테나 $1{\times}2$배열, 수신안테나 $1{\times}2$배열로 각각 구성하였다. 안테나는 CST MWS를 사용하여 시뮬레이션 하였고 RO-4003 기판(h=0.5mm, ${\epsilon}r=3.38$)을 사용하여 제작하였다. 제작된 안테나는 충돌방지용 센서회로 뒷면에 설치되어 측정되었다. 시뮬레이션에서 안테나이득은 8.5dBi, 빔폭은 약 $50^{\circ}$로 예측되었다. 실제 측정된 안테나 대역폭은1GHz($VSWR{\le}2$) 정도로 목표 사양을 만족하였다.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송∙미디어공학회 2020년도 하계학술대회
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• pp.500-504
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• 2020

포인트 클라우드는 수십만 또는 수백만개의 포인트로 객체 또는 장면을 나타내며, 그 데이터의 양은 엄청 나기 때문에, 다양한 대역폭 또는 장치에서 효과적인 서비스를 위해 확장성 기능을 갖춘 압축 체계 개발이 필요하다. 이에 따라, 단방향 패치 패킹을 활용한 LoD 제어 테이블 기반 밀도 확장성(LoD control table based Density scalability by using Unidirectional Patch packing, LDUP) 방법을 이용한 확장성에 대한 연구가 이루어졌다. 그러나, LDUP 방법은 2D 그리드의 크기를 조작하는데 한계가 있어, 패치 사이의 거리가 드물게 패킹되고, 이는 압축 효율을 떨어뜨린다. 본 논문에서는 이러한 단점을 극복하기 위해 양방향 패치 패킹을 활용한 LoD 제어 테이블 기반 밀도 확장성(LoD control table based Density scalability by using Bidirectional Patch packing, LDBP) 방식을 제안한다. 제안된 LDBP 방법은 패치가 패킹된 영상에서 빈 공간을 효과적으로 감소시켰으며, 압축 효율 측면에서 LDUP 방법에 비해 더 높은 BD-Rate 이점을 얻었다. 제안된 LDBP 방법은 3D 포인트 클라우드 압축 시 포인트 클라우드 밀도 확장성을 기존의 LDUP 보다 효과적으로 달성하였다.

• Journal of Pharmaceutical Investigation
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• 제25권1호
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• pp.47-54
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• 1995

Transdermal patch formulations of estradiol to treat post-menopausal symptoms and prevent osteoporosis in women were developed and evaluated for the permeation characteristics through the excised hairless mouse abdorminal skin and the uterotropic effect on the ovariectomized rabbits. The design of patch formulations was optimized by varying several formulation parameters, such as type of enhancers, amount of enhancers, amount of drug loading and coating thickness. Compared to a commercially available transdermal product, several patch formulations showed the similar skin permeation profiles (following zero-order kinetics), but their skin permeation rates were lasted for the longer period (a week). In one-week uterotropic efficacy test in the ovariectimized rabbits, the selected patch formulations showed the positive effect in atrophy of the urogenital epithelium. The mean values of uterus weight in rabbits after application of patches containing estradiol were much higher than those in control group (containing no drug).

• Smart Structures and Systems
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• 제12권5호
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• pp.523-545
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• 2013

Piezoelectric and dielectric behaviors of a piezoceramic patch adhesively centered on a carbon composite plate are identified using a robust multi-objective optimization procedure. For this purpose, the patch piezoelectric stress coupling and blocked dielectric constants are automatically evaluated for a wide frequency range and for the different identifiable behaviors. Latters' symmetry conditions are coded in the design plans serving for response surface methodology-based sensitivity analysis and meta-modeling. The identified constants result from the measured and computed open-circuit frequencies deviations minimization by a genetic algorithm that uses meta-model estimated frequencies. Present investigations show that the bonded piezoceramic patch has effective three-dimensional (3D) orthotropic piezoelectric and dielectric behaviors. Besides, the sensitivity analysis indicates that four constants, from eight, dominate the 3D orthotropic behavior, and that the analyses can be reduced to the electromechanically coupled modes only; therefore, in this case, and if only the dominated parameters are optimized while the others keep their nominal values, the resulting piezoelectric and dielectric behaviors are found to be transverse-isotropic. These results can help designing piezoceramics smart composites for various applications like noise, vibration, shape, and health control.

• 식물병연구
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• 제14권1호
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• pp.43-50
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• 2008

Rhizoctonia solani AG2-2에 의해 발생되는 잔디 갈색퍼짐병(large patch)은 한국잔디로 식재된 골프장 페어웨이에서 문제가 되는 대표적 병해이다. 본 연구에서는 잔디 갈색퍼짐병의 생물학적 방제법에 이용할 수 있는 길항 미생물을 R. solani AG2-2에 대한 항균활성과 균사생장 억제율 등을 기준으로 1차 선발하였고, 선발된 길항미생물에 대해 폿트 수준의 생물검정실험을 실시하였다. 두 실험을 통해 선발된 길항미생물 중에서 상대적 길항효과 지수(RPI) 값을 기준으로 잔디 갈색퍼짐병에 대해 가장 우수한 것으로 최종 선발된 길항미생물 CJ-9는 동정한 결과 Bacillus subtilis로 밝혀져, B. subtilis CJ-9이라 명명하였다. B. subtilis CJ-9는 합성농약에 대한 내성 실험을 통해 현장에 적용시 화학 농약과의 혼용이 가능함을 밝혔다. 골프장에서 야외 포장시험을 실시한 결과, 실험 기간동안 합성농약에 의한 관행처리구에서 잔디 갈색퍼짐병이 2차례 발병된 것과 비교하여 B. subtilis CJ-9를 처리한 시험구에서는 전혀 발생하지 않아 방제 효과가 인정되었다. 선택배지를 이용한 병원균 밀도 조사를 통하여 B. subtilis CJ-9 처리가 잔디 갈색퍼짐병을 일으키는 병원균의 밀도를 감소시키는 것을 확인하였다. 따라서 B. subtilis CJ-9이 잔디 갈색퍼짐병 방제를 위해 합성농약을 대체할 수 있는 친환경적인 방제방법이 될 수 있음을 입증하였다.

• 한국유기농업학회지
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• 제6권1호
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• pp.133-149
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• 1997

Recently, the importance of management and cultivation of grasses has been increased in Korea. Among these cultural practices, the appropriate control of diseases is considered more important than other cultivation techniques such as fertilization and irrigation. The damages of brown patch and large patch caused by Rhizoctonia spp. and Pythium blight caused by Pythium spp. are serious in the major cultivation area of turfgrass in Korea. Since these diseases are difficult to control by agrochemicals, the damages are very serious if these are occured. The periodic spray of agrochemicals, to protect and control these diseases could make some problems of toxicity and environmental pollution as well as rising of non-target diseases. Therefore, the biological methods to control diseases have been required to decrease problems resulted from overuse of agrochemicals, to conserve natural ecosystem, and to control effectively diseases of grasses in the long period. The number of studies about biological control using antagonistic microorganisms have been increased for last half century. However, the application of biological control method has been very limited. In this study, thirteen isolates of R. cerealis, 8 isolates of R. solani and 3 isolates of Phthyn spp. have been isolated from diseased turfgrass in golf course and grass-culture area that have patch and wilting symptoms of zoysia grass and creeping bentgrass. Isolation frequency of R. cerealis and R. solani was high in especially zoysiagrass, while Pythym spp. was isolated from bent grass at low frequency but showed high pathogenicity. Totally, 205 isolates of soil microorganisms were isolated in this study as primary antagonistic microorganism by Herr's triple agar layer plate and dual culture method using rhizosphere of grasses, soil of crop field as the source of antagonistic microorganisms. Among the 205 isolates, 23 isolates were actinomycetes and 182 isolates were bacteria. All of the actinomycetes were isolated by Herr's method. Antagonistic effect of primary isolated microorganisms was tested for in vitro mycelial growth inhibition against pathogenic fungi isolated from grasses and for inhibition of disease occurrence in 24 well tissue culture plate and pot experiment. Then, four isolated of bacteria which are BG23, BG74, BG136 and BG171 were selected as antagonistic microorganisms against soil-born pathogenic fungi of bentgrass.

• Korea-Australia Rheology Journal
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• 제21권2호
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• pp.83-89
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• 2009

Coating process plays an important role in information technology such as display, battery, chip manufacturing and so on. However, due to complexity of coating material and fast deformation of the coating flow, the process is hard to control and it is difficult to maintain the desired quality of the products. Moreover, it is hard to measure the coating process because of severe processing conditions such as high drying temperature, high deformation coating flow, and sensitivity to the processing variables etc. In this article, the coating process is to be re-illuminated from the rheological perspectives. The practical approach to analyze and quantify the coating process is discussed with respect to coating materials, coating flow and drying process. The ideas on the rheology control of coating materials, pressure and wet thickness control in patch coating process, and stress measurement during drying process will be discussed.

• Weed & Turfgrass Science
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• 제7권2호
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• pp.87-97
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• 2018

잔디는 공익적 기능, 오락 및 휴양 그리고 미적인 측면에서 인간에게 다양한 이점을 제공한다. 잔디병해는 골프장, 운동장, 공원, 잔디재배지 등에 피해를 일으키는 주요 원인이며 이를 방제하기 위하여 막대한 비용이 소요된다. 한국의 잔디병해 연구는 아직 다른 분야에 비하여 관심이 낮은 편이지만 잔디병해에 대한 연구의 필요성은 매우 높다고 본다. 본 연구에서는 지금까지 우리나라에서 이루어진 잔디병 관련 연구 결과들을 분석하고, 국내 잔디병 연구사를 정리하여 앞으로의 잔디병리 분야의 발전방향을 고찰하고자 한다. 연구논문은 국내학술지와 한국교육학술정보원에서 제공하는 논문탐색 시스템을 이용하여 잔디병과 관련된 논문을 수집, 분석하였다. 국내 잔디병과 관련된 논문은 약 80여 편이 한국잔디학회지에 게재되어 전체 논문의 50%를 차지하였다. 이 중 잔디병 방제에 대한 논문이 전체논문 대비 50%를 차지하였다. 잔디병해 별로는 라이족토니아마름병(large patch)에 대한 연구가 36%로 가장 많았으며 다음으로 동전마름병(dollar spot) 18%, 피티움마름병(Pythium blight) 10%, 설부병(Typhular blight) 8% 순으로 나타났다. 국내에서 처음으로 보고된 잔디병은 15종류이다. 잔디병 방제를 위하여 국내에 등록된 약제의 수는 542개로 갈색잎마름병, 녹병, 누른잎마름병, 동전마름병, 라이족토니아마름병, 설부소립균핵병, 여름잎마름병, 탄저병, 피티움마름병, 흰가루병과 조류에 등록되어 있다. 향후 우리나라에서 미보고된 잔디병해의 학문적 탐색과 병명의 정립이 필요하고, 효과적인 병방제를 위하여 잔디병에 대한 생리, 생태학적인 연구와 더불어 친환경적 방제 방법의 개발이 필요할 것으로 본다.

• 대한치과의사협회지
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• 제55권10호
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• pp.676-687
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• 2017

Objectives : The aim of this study was to evaluate the effects of a composite of bone substitute and collagen barrier membrane (bone patch) for local ridge augmentation at peri-implant dehiscence defects on the clinical efficacy and positional stability in dogs. Materials and methods : Implant placement and ridge augmentation procedure were performed at surgically created peri-implant dehiscence defects in canine mandible (n=6). Four treatment modalities were randomly applied: i) bone patch group, ii) Guided bone regeneration (GBR) without pin fixation group (bone graft and collagen membrane), iii) GBR with pin fixation group, and iv) negative control group. After 12 weeks, clinical, micro-CT and histological analyses were performed. Results : Histologic analysis showed that bone patch group had similar results to GBR group and GBR with fixation group in terms of new bone formation. Micro-CT analysis revealed similar results to histologic analysis in terms of total volume maintenance. Operating time was shorter in bone patch group compared to GBR group and GBR with fixation groups. Conclusions : GBR using bone patch could simplify the ridge augmentation procedure with reduced operating time and equivalent biological performance compared to the conventional procedure.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1664-1667
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• 2003

Aperture-coupled microstrip antenna is one type of microstrip antennas. This type of antenna has bandwidth wider than simple microstrip antenna. Herein, we use two substrates, that have the same dielectric constant 2.47 (PTFE-quartz) in which upper substrate is a rectangular patch. The microstrip patch is fed by a microstrip line which is printed on lower substrate, through an aperture or slot in the common ground plane of patch and microstrip feed. This antenna is analyzed by using Finite Difference Time Domain (FDTD) method the specific design frequency 10 GHz and match impedance is 50 ohms. The simulation results of its characteristics are input impedance, return loss, VSWR and radiation patterns respectively.