• The KIPS Transactions:PartB
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• v.15B no.2
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• pp.171-178
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• 2008

Foreign word transliterations are not consistently used in documents, which hinders retrieving some important relevant documents in exact term matching information retrieval systems. In this paper, a meta search method is proposed, which expands and refines relevant variant queries from an original input foreign word transliteration query to retrieve the more relevant documents. The method firstly expands a transliteration query to the variants using a statistical method. Secondly the method selects the valid variants: it queries each variant to the retrieval systems beforehand and checks the validity of each variant by counting the number of appearance of the variant in the retrieved document and calculating the similarity of the context of the variant. Experiment result showed that querying with the variants produced at the first step, which is a base method of the test, performed 38% in average F measure, and querying with the refined variants at the second step, which is a proposed method, significantly improved the performance to 81% in average F measure.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2012.03a
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• pp.116-116
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• 2012

국내 섬유산업의 경쟁력을 향상시키고 채산성을 확보하기 위해 고부가가치 섬유 제품의 개발이 요구된다. 심미성을 발현하는 대표적인 후가공 기술인 카렌더 가공은 국내뿐만 아니라 국외 후진국에서도 보편화된 기술로 대량 생산으로 인한 가공비 저하, 물량 확보 등에 많은 어려움을 격고 있어 고부가가치의 신기술을 요구한다. 최근 이태리, 일본 등의 선진국에서 후가공 기술인 EMBO 롤러를 이용한 무아레 가공 원단이 고가로 거래되고 있다. 무아레(Moire)는 프랑스어로 "물결 모양의 무늬"라는 뜻으로 직물에 파형(波形)또는 나뭇결 무늬를 나타나게 하는 가공 기술로, 국내에서도 EMBO 롤러를 이용하여 무아레 가공을 하거나 두 겹의 원단을 이용한 무아레 가공이 시도되고 있으나, 전자의 경우 사용되는 롤러가 일반 롤러에 비해 훨씬 고가이고 한 종류의 롤러로 제한된 패턴 밖에 표현할 수 없고 적용 소재가 한정되는 등 많은 단점을 지니고 있고, 후자의 경우 세탁내구성이 나빠 상품화조차 되지 못하고 있어 현재 국내 섬유가공 기술로는 고내구성을 가지고 다양한 효과를 발현하는 무아레 가공이 불가능한 실정이다. 직물의 경 위사 밀도차이를 이용하여 무아레를 형성할 수 있다는 점에 착안하여, 경 위사 조직을 갖는 이형(離型)원단에 PU 수지를 코팅하여 격자무늬(grid) 필름을 제조하고 제조된 Grid 필름과 Base원단을 라미네이팅하여 경 위사 밀도차에 의해 무아레 무늬를 형성할 수 있었다. 이형원단과 Base원단의 경 위사의 밀도에 따라 다양한 패턴의 3차원 무아레 무늬를 발현시킬 수 있으며 합성섬유 및 천염섬유 등의 원단 소재에 제약 없이 영구 내구성의 무아레 제품을 생산할 수 있을 것으로 판단된다. 본 연구에서는 Grid 필름을 이용한 무아레 가공을 위하여 이형원단 제조 조건을 확립하였고, grid 필름 캐스팅 조건, 라미네이팅 조건을 달리하여 이형성 및 무아레 형상을 비교하여 고찰함으로써 제품화에 필요한 요소 기술의 기초를 마련하고자 한다.

• The Journal of Korea Assosiation for Disability and Oral Health
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• v.13 no.1
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• pp.23-27
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• 2017

Ectodermal Dysplasia is a genetic disorder caused by the abnormal development of two or more structures derived from the ectodermal layer. As an aspect in dentistry, ectodermal dysplasia is characterized by hypodontia, conical or peg-shaped teeth, reduced salivary secretion and decreased vertical dimension. These unfavorable oral conditions make children to have difficulties with mastication, esthetics, and even in social activities. This case report presents an alternative oral rehabilitation treatment of a 4-year-old boy with ectodermal dysplasia. A removable space maintainer with artificial teeth in maxillary arch was delivered according to the initial treatment plan. However, the child failed to adapt the appliance because of his masticatory habit. Then a fixed-type space maintainer was delivered on the patient's esthetic demand and it restored function, esthetics and self-esteem of the patient. The treatment described here suggests that individually customized considerations are essential for the oral rehabilitation of a patient with ectodermal dysplasia.

• Journal of the korean academy of Pediatric Dentistry
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• v.27 no.2
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• pp.222-228
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• 2000

Ectodermal dysplasia is a hereditary disease characterized by a congenital dysplasia of one or more ectodermal structures and their accessory appendages. At least 120 subtypes of ectodermal dysplasia have been reported. The disease is usually transmitted as an X-linked recessive trait in which the gene is carried by the female and manifested in the male. Hypohidrotic ectodermal dysplasia is manifested as a triad of defects that include hypohidrosis, hypotrichosis and hypodontia. The characteristic facial features consist of asteatosis, onchodysplasia, sparse and fine blond hair, prominent forehead, a depressed nasal bridge, thick everted lips. The patient may suffer from dry skin, hyperthermia and unexplained high fever as a result of the deficiency of sweat glands. This case report presents detailed procedures of rehabilitating functional and esthetic defect of a 6-year-old boy with hypohidrotic ectodermal dysplasia along with the review of relevant literatures.

• Journal of the Korean Applied Science and Technology
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• v.29 no.1
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• pp.13-18
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• 2012

A die casting mold releasing agent was prepared from aqueous mixture of powdery carbon black and water soluble natural polymeric materials such as xanthan gum(X-gum) and carboxymethyl cellulose(CMC), which were used as thickening agent as well as curing agent with aldehydes. The suitable concentration of natural polymers for stable dispersion of carbon black in water was 0.25 wt% of X-gum or 1.0 wt% of CMC. When CMC was used less than 1 wt%, the final carbon black disperion showed a rapid phase separation. The adhesion of carbon black releasing agent on glass plate was improved with the amount of crosslinking agent, glutaraldehyde and chain extender, oligosaccharide. However, the affinity of carbon black releasing agent prepared with X-gum was stronger than that with CMC on glass plate. The final carbon black mold releasing agents prepared under our mixing conditions can be applied to the production of castings of high quality with good workability and without worthening evironmental situations.

• The korean journal of orthodontics
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• v.30 no.6 s.83
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• pp.739-745
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• 2000

Ectodermal dysplasia is a hereditary disease characterized by a congenital dysplasia of one or mote ectodermal structures. Characteristic manifestations Include scanty hair and eyebrows, pigmented and hyperkeratinized skin around the eyes and mouth, frontal bossing with prominent supraorbital ridges, nasal bridge depression and dental anomalies. Hyperthermia or unexplained high fever as a result of the deficiency of sweat glands is common medical history. Findings of intraoral structures are anodontia or oligodontia with conical crowns. Consequently, generalized spacing and loss of vertical dimension of occlusion. Interdisciplinary approach has been performed to treat a 10-year old boy with ectodermal dysplasia. Orthodontists and a prosthodontist worked together on this case, and the result was satisfactory.

• Proceedings of the Korea Water Resources Association Conference
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• 2011.05a
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• pp.319-324
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• 2011

최근 자연환경보전이라는 새로운 패러다임의 대두로 하천의 생태기능 향상을 위한 호안조성공법 중 하나인 식생매트호안 공법의 적용이 증가하고 있다. 국내 하천의 경우 비교적 큰 하상계수와 소류력의 증가로 식생매트 고정용 앵커핀의 기능 저하에 따른 호안의 피해가 발생하고 있다. 그러나 앵커핀의 외력저항성 연구 및 설치를 위한 기준이 마련되어 있지 않는 실정이다. 본 연구에서는 앵커핀의 인발특성을 연구함으로서 외력저항 특성을 파악하고자 하였다. 연구방법으로는 앵커핀을 관입시킨 토사에 인발장치를 연결하여 최대인발력과 인발력의 변화추이를 관찰하였다. 실험에 사용된 토사는 물다짐으로 다졌으며, 앵커핀은 식생매트 고정용으로 적용이 많은 이형철근형 앵커핀을 사용하였다. 대조군으로 형태가 동일한 원형철근을 이용하여 앵커핀을 제작 실험에 사용하였다. 실험조건은 앵커핀의 직경(10mm, 16mm)에 따른 주면과 침수토사의 배수시간 (48hr, 96hr, 144hr) 조절을 통한 함수율의 변화에 따른 인발특성을 관측하였다. 실험결과 평균 최대인발력의 변화는 48시간 배수시 직경변화에 따라 이형철근은 12.8N, 28N, 원형철근은 10.6N, 21N으로 나타났으며, 96시간 배수시 이형철근은 18.8N, 33N, 원형철근은 12.2N, 21.6N으로 나타났고, 144시간 배수시 이형철근은 21.4N, 36.4N, 원형철근은 20.4N, 33.2N으로 나타났다. 앵커핀의 인발력은 주면의 크기에 비례하며, 표면의 형태와 함수량에 따라 영향을 받는 것으로 나타났다. 따라서 이러한 앵커핀의 인발 특성을 파악하고, 식생호안에 적용한다면 피해를 최소화 할 수 있을 것으로 사료된다.

• Journal of Adhesion and Interface
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• v.12 no.4
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• pp.144-150
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• 2011

The effect of low profile agent and release agent on the surface and mechanical properties of bulk mold compound were investigated. Atomic content and contact angle of surface were characterized using X-ray photoelectron spectroscopy and contact anglemeter. Surface morphology and surface roughness were obtained using field emission scanning electron microscope and atomic force microscope, respectively. As increasing the low profile agent from 0 to 9.2 wt%, the volume shrinkage and surface roughness decreased from 0.35% to 0.05%, and from $0.27{\mu}m$ to $0.12{\mu}m$, respectively. The increase of release agent from 1.8 wt% to 3.6 wt% resulted in the migration of release agent to sample surface and it increased the surface roughness. The flexural strength and impact strength were decreased approximately 30% as the low profile agent increasing from 5.0 wt% to 9.0 wt%.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.4
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• pp.626-632
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• 2001

Ectodermal dysplasia is a hereditary disease characterized by congenital dysplasia of one or more ectodermal structures. Intraorally, common findings are anodontia or oligodontia, conical teeth, and, consequently, generalized spacing. This case presented the oral rehabilitation of a child with hypohidrotic ectodermal dysplasia. Oral rehabilitation is important from functional, esthetic, and psychologic perspectives. Due to the absence of teeth, the volume of alveolar bone and its growth are decreased, resulting in a loss of vertical dimension and protuberant lips. The treatment involved increasing the patient's vertical dimension of occlusion, fabricating a maxillary partial denture, and using magnets to help retain the mandibular partial denture. A 5-year 7-month old Korean boy was referred to the pediatric department for examination, evaluation and treatment of his disorder. we used magnets on '73 and '83 for enhanced retention of a mandibular overdenture. The magnet used in this case was the Magfit system(GC Co., Japan).

• The Journal of Korean Institute of Information Technology
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• v.16 no.12
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• pp.41-47
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• 2018

The buoy-enabled underwater surveillance system is a device that is installed in a particular sea area and operated for a certain period of tine and moved to another sea area after recovery. In this paper, a mooring method which is applied for a buoy-enabled underwater surveillance system was selected to maintain installation and enure stable operation. Also, the structure of the mooring line was designed. Two-point mooring method was selected considering interference with the communication cable of array-assembly. The composite structure of buoy chain, nylon rope, and anchor chain is designed as the basic component of mooring line. For the verification of design, a numerical simulation and wave tank experiment were performed. Their results were confirmed similarity in test condition. Finally, the mooring lines were designed for the environment of the sea trial location. The mooring line produced by the final design confirmed the stability above the significant wave height considered in the design on the sea trial.