• 한국약용작물학회지
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• 제19권4호
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• pp.233-237
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• 2011

This study was carried out to investigate the seedling establishment and yield of direct-sown Platycodon grandiflorus seeds cultured by three ridge width, 0.4, 0.8, and 1.2 m and four mulching materials, rice straw, rice bran, black plastic film, and no mulching in upland. Seedling establishment rate (70%) was the highest in rice straw mulched plot of 500 seeds/$m^2$ sowed and root yield after one year was also the highest in rice straw mulched treatment and followed by rice bran, no mulching, and black plastic film treatment. In this result, ridge width 120cm and rice straw mulching combined treatment was best for getting the highest seedling establishment ratio and seedling numbers per area. However, ridge width and mulching materials should be considered soil moisture content and weed population for saving labor cost.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.348-348
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• 2017

This experiment was conducted to investigate the aspect of tiller occurrence, growth and yield of sorghum according to planting density and sowing date. The subject of this experiment is to supply basic data to inhibit non-productive tillers uneconomical and cumbersome for mechanical harvesting. Also another subject was to evaluate optimum planting density and sowing date in central district area. Total number of tillers was more in 80cm ridge than 60cm ridge and it was increased as the planting distance was wider from 15cm to 30cm on the each ridge. Ratio of effective tillers was higher in 60cm ridge than 80cm ridge and it was decreased as planting distance was wider from 15cm to 30cm. The lower the planting density, the more increased total number of tillers, whereas effective tillers were decreased as planting density was high. Average of total number of tillers of three varieties was higher in sowing date of 2 May (1st sowing date), whereas ratio of effective tillers was the highest in sowing date of 23 May (2nd sowing date). Hwanggeumchal showed the highest total number of tillers (1.2 tillers), while Moktaksusu had the lowest total number of tillers (0.8 tillers) among three varieties. There were no significant difference between planting density and days to heading and ripening date from seeding. Culm length increased as planting density was high, but ear length, grains per ear and 1000 grain weight were decreased on the other hand. The highest yield of sorghum per 10a was obtained from $60{\times}20cm$ planting density among 6 planting densities.

• 화훼연구
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• 제16권4호
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• pp.255-259
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• 2008

준고냉지에서 안개초 'Bristol Fairy'를 실험재료로 이랑높이를 10, 20, 30, 40 cm로 하여 토양 물리성, 생육 및 개화특성 등을 조사하였다. 주간 지온, 토양 수분함량, 토양 경도, 용적밀도 및 고상률은 이랑이 높을수록 낮고, 공극률은 약간 높아지는 경향이었다. 여름과 가을 절화작형에서 30 cm, 40 cm 이랑에서 개화는 약간 지연되었으나, 뿌리활력, 화수폭과 절화량은 우수하였다. 여름을 경과하면서 발생한 고사주율 및 로젯트 발생률, 비원추화서률 등 생리장해 발생도 낮아지는 경향이었다.

• 전자공학회논문지D
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• 제35D권9호
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• pp.93-99
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• 1998

수직 방향성결합기 구조에서 결합파장 및 결합분포를 달리하는 결합기 4개를 포함하는 헙대역 파장역다중기를 제안하고 동작특성을 모의실험 하였다. 너비가 다른 네 개의 ridge 광도파로를 동일한 strip상에 집적하여 수직결합시킴으로써 각각의 ridge 광도파로가 개별 파장여과기로 동작한다. 각 채널에서 발생하는 부엽(side-lobe)을 억제하기 위해 두 광도파로 간의 결합계수를 광파 진행방항으로 변화시켰다. 모의실험 결과 1.55 ㎛ 중심파장 대역에서 채널간격은 7 nm 이고 각 채널은 1.7 nm의 3-dB 통과대역폭, 20dB의 부엽억제비 및 약 90%의 광전력 전달효율을 보이면서 각 채널이 균일한 광여과 응답특성을 나타냄을 알 수 있었다.

• ETRI Journal
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• 제29권6호
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• pp.811-813
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• 2007

We report on a ridge waveguide laser diode with laterally tapered waveguides fabricated in a single growing step using a double patterning method. In this structure, nearly constant output power is obtained with the change of the lower tapered waveguide width, and the facet power ratio of 1.4 to 1.5 is observed over the current range. The asymmetric facet power property is also investigated.

• Journal of Periodontal and Implant Science
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• 제47권1호
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• pp.51-63
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• 2017

Purpose: Following tooth extraction, alveolar ridge preservation (ARP) can maintain the dimensions of ridge height and width. Although previous studies have demonstrated the effects of ARP, few if any studies have investigated the compressive force applied during grafting. The aim of this study was to determine the effects of different compressive forces on the graft materials during ARP. Methods: After tooth extraction, sockets were filled with deproteinized bovine bone mineral with 10% porcine collagen and covered by a resorbable collagen membrane in a double-layered fashion. The graft materials were compressed using a force of 5 N in the test group (n=12) and a force of 30 N in the control group (n=12). A hidden X suture was performed to secure the graft without primary closure. Cone-beam computed tomography (CBCT) was performed immediately after grafting and 4 months later, just before implant surgery. Tissue samples were retrieved using a trephine bur from the grafted sites during implant surgery for histologic and histomorphometric evaluations. Periotest values (PTVs) were measured to assess the initial stability of the dental implants. Results: Four patients dropped out from the control group and 20 patients finished the study. Both groups healed without any complications. The CBCT measurements showed that the ridge volume was comparably preserved vertically and horizontally in both groups (P>0.05). Histomorphometric analysis demonstrated that the ratio of new bone formation was significantly greater in the test group (P<0.05). The PTVs showed no significant differences between the 2 groups (P>0.05). Conclusions: The application of a greater compressive force on biomaterials during ARP significantly enhanced new bone formation while preserving the horizontal and vertical dimensions of the alveolar ridge. Further studies are required to identity the optimal compressive force for ARP.

• 한국자원식물학회지
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• 제18권1호
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• pp.22-31
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• 2005

콩의 논 재배시 생육반응은 밭에서와는 다른 결과가 예상되므로, 논재배 콩의 휴립조건에 따른 생장분석을 분석 하고자 화엄 풋콩 등 5품종을 고휴와 평휴로 재배하여 생육반응을 분석한 결과는 다음과 같다. 휴립조건에 따른 콩의 지상부 생육은 경장의 경우 전 생육기에서 평휴재배시 높은 경향을 보이지만, 분지수와 경직경은 생육 후기로 갈수록 고휴조건에서 큰 경향을 보였다. 그러나 지상부 생육은 재배조건에 따른 차이보다, 품종간 차이가 보다 뚜렷하게 나타났다. 논에서 휴립 조건에 따른 생육단계별 콩의 지상부생육은, 생육초기인 V5 stage에서는 평휴재배시 건물 생산능력이 고휴재배시 보다 높았으나, 생육이 진전될수록 고휴로 재배할 때 건물중 생산이 높았으며, 전 생육기간 동안 품종별 차이가 뚜렷하였다. 재배조건에 따른 콩의 논에서의 지하부의 생육은, V5, R2 및 R5 stage 등 전 생육기간동안 고휴 재배시 지하부의 생육이 평휴재배조건 보다 왕성하였으며, 재배방법에 따른 고휴재배 효과는 나타나지 않았으나, 품종간 차이는 컸다. T/R율은 평휴로 재배할 경우 높았고, 재배방법에 따른 고휴재배 효과는 나타나지 않았으나, 품종간 차이는 인정되었다.

• Journal of electromagnetic engineering and science
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• 제14권1호
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• pp.36-42
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• 2014

In this paper, an epsilon near zero (ENZ) tunneling circuit using a double-ridge rectangular waveguide (RWG) is proposed for the miniaturization of a waveguide component. The proposed ENZ channel and is located in the middle of the input-output RWG (IORWG). The ratio of the height to the width of the channel waveguide is very small compared to the IORWG. By properly adjusting the ridge dimensions, the tunneling frequency of the proposed ENZ channel can be lowered to near the cut-off frequency of the IORWG. For the proposed ENZ tunneling circuit, the approach adopted for extracting the effective permittivity, effective permeability;normalized effective wave impedance, and propagation constant from the simulated scattering parameters was explained. The extracted parameters verified that the proposed channel is an ENZ channel and electromagnetic energy is tunneling through the channel. Simulation and measurement results of the fabricated ENZ channel structure agreed.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제36권5호
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• pp.224-229
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• 2014

The maxillary posterior area is the most challenging site for the dental implant. Although the sinus graft is a predictable and successful technique for rehabilitation of atrophic and pneumatized posterior maxilla, when there is severe destruction of alveolar bone, a very long crown length remains challenging after successful dental implants installation with sinus graft. We performed vertical augmentation of the maxillary posterior alveolar ridge using the allogenic block bone graft with a simultaneous sinus graft using allogenic and heterogenic bone chips. After about six months, we installed the dental implant. After this procedure, we achieved a more favorable crown-implant fixture ratio and better results clinically and biomechanically. This is a preliminary report of vertical augmentation of maxillary posterior alveolar ridge using allogenic block bone graft and simultaneous maxillary sinus graft. Further research requires longer observation and more patients.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제32권3호
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• pp.276-281
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• 2010

The maxillary posterior area is the most challenging site for the dental implant. After missing of teeth on maxillary posterior area due to periodontal problems, the remaining alveolar ridge is usually very thin because of not only pneumatization of maxillary sinus but also destruction of alveolar bone. The maxillary sinus bone graft procedure is one of the most predictable and successful treatments for the rehabilitation of atrophic and pneumatized endentulous posterior maxilla. But, in case of severe destruction of alveolar bone due to periodontal problems, very long crown length is still remaining problem after successful sinus graft procedures. We performed vertical augmentation of maxillary posterior alveolar ridge using mandibular ramal block bone graft with simultaneous sinus graft. After this procedures, we could get more favorable crown-implant ratio of final prosthodontic appliance and more satisfactory results on biomechanics. This is a preliminary report of the vertical augmentation of maxillary posterior alveolar ridge using mandibular ramal block bone graft with simultaneous sinus graft, so requires more long-term follow up and further studies.