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고승오,박경정,신효근,김오환 全北大學校 齒醫學硏究所 1989 전북치대논문집 Vol.7 No.1
The purpose of this article is to study the histologic response of a hydroxylapatite(HAP)-coated CP-titanium implant system and plasma sprayed CP-titanium implant system comparatively in dogs. The implant system used were cylindrical, non-fluted, without external threads. Two months after extraction of the mandibular third and forth premolar, the dogs were implanted using a atraumatic technique and were sacrificed at 4 weeks, 8 weeks after implantation. The other provided specimens for histologic analysis. The results obtained were as follows. 1. The specimens of four weeks had thin fibrous interpositional layer at coronal and middle portion, with projections of new bone opposition to the implant perimeter. But HAP-coated implant system showed lee fibrous interpositionla layer in thickness and quantity than plasma sprayed titanium and showed an osteoid layer in coronal portion. 2. The specimens of eight weeks of plasma sprayed titanium implant system showed thin fibrous tissue between implant system and bone in coronal and middle portion, similar to the specimen of four weeks but HAP-coated implant system were covered with a mature bone on almost part of their surfaces. 3. The auther confirmed HAP-coated implant system is more biocompatible and its subsequent bone formation and maturation occured at a faster rate and at earlier periods than plasma sprayed titanium.
고승오,강성현,엄병구,박윤하 대한구순구개열학회 2018 대한구순구개열학회지 Vol.21 No.1
The nasal and oral cavity must be completely closed off while swallowing, vomiting, blowing, sucking, whistling and speaking oral sounds. This velopharyngeal closure is especially important when producing pressure-sensitive sounds. During normal velopharyngeal (VP) function, posterior third of soft palate moves posterior-superiorly, pharyngeal wall moves anteriorly and medially to form a shape of a sphincter resulting the closure of oral and nasal cavities. Velopharyngeal dysfunction (VPD) is a term describing an inappropriate function of VP port which consists of lateral and posterior pharyngeal walls and soft palate. This muscular valve can control the air passage between oro- and nasopharynx. The impairment of velopharyngeal function can be attributed to structural causes, neurologic causes and speech mislearning. Diagnosis of VPD, identifying a critical cause of the dysfunction, can be carried out through physical and oral examination, perceptual speech assessment, radiographic mulitplanar videofluoroscopy and nasendoscopy. Treatment options of VPD include surgical and prosthetic interventions in combination with speech therapy. Speech therapy is the mainstay in treatment of patients with VPD. Prosthetic devices for VPD can be alternative treatment method when surgical approach is not considered. Widely used types of these devices, called speech aids, are palatal lift appliance and speech bulb.
고승오,임양희,김기병,신효근 대한구순구개열학회 2007 대한구순구개열학회지 Vol.10 No.1
The vertebrate upper lip forms from initially freely projecting maxillary, medial nasal, and lateral nasal prominences at the rostral and lateral boundaries of the primitive oral cavity. These facial prominences arise during early embryogenesis from ventrally migrating neural crest cells in combination with the head ectoderm and mesoderm and undergo directed growth and expansion around the nasal pits to actively fuse with each other. Initial fusion is between lateral and medial nasal processes and is followed by fusion between maxillary and medial nasal processes. Fusion between these prominences involves active epithelial filopodial and adhering interactions as well as programmed cell death. Slight defects in growth and patterning of the facial mesenchyme or epithelial fusion result in cleft lip with or without cleft palate, the most common and disfiguring craniofacial birth defect. This review will summarize the current understanding of the basic morphogenetic processes and molecular mechanisms underlying upper lip development.
고승오,신효근,김현기,홍기환,서정환,고도홍 한국음성과학회 1998 음성과학 Vol.3 No.-
Velopharyngeal function refers to the combined activity of the soft palate and pharynx in closing and opening the velopharyngeal port to the required degree. In normal speech, during the production of oral consonant sounds elevation of the soft palate, along with the superior constrictor muscle, occludes the oropharynx from the nasopharynx. Inadequate velopharyngeal function caused by congenital or acquired insufficiency or incompetency may result in abnormal speech characterized by hypernasality, nasal emission and decreased intelligibility of speech due to weak consonant production. The speech aid is often helpful in improving the speech of individuals with velopharyngeal incompetency. In this article, the pathogenesis and treatment of velopharyngeal incompetence are discussed and a speech aid appliance that was constructed for the patient is described. Keywards : velopharyngeal, hypernasality, speech aid, pathogenesis
DTV 튜너를 위한 48MHz~1675MHz 주파수합성기 설계
고승오,서희택,권덕기,유종근,Ko, Seung-O,Seo, Hee-Teak,Kwon, Duck-Ki,Yu, Chong-Gun 한국정보통신학회 2011 한국정보통신학회논문지 Vol.15 No.5
본 논문에서는 DTV 응용을 위한 광대역 주파수 합성기 회로를 $0.18{\mu}m$ CMOS 공정을 사용하여 설계하였다. 설계한 주파수 합성기는 DTV의 모든 주파수 대역을(48MHz~1675MHz) 만족한다. 하나의 VCO만을 사용하여 광대역을 만족시킬 수 있는 구조를 제안하였으며, 고주파 대역과 저주파 대역에서의 VCO 이득의 차이와 주파수 간격의 변화를 줄여 안정적인 광대역 특성을 구현하였다. 모의실험 결과, VCO의 발진주파수 범위는 1.85GHz~4.22GHz이며, 4.2GHz에서 위상잡음은 100kHz offset에서 -89.7dBc/Hz이다. VCO 이득은 62.4~95.8MHz/V(${\pm}21.0%$)이고 주파수 간격은 22.9~47.9MHz(${\pm}35.3%$)이다. 설계된 주파수합성기의 고착시간은 약 $0.15{\mu}s$이다. 제작된 칩을 측정한 결과 VCO는 2.05~3.4GHz의 대역에서 발진하는 것을 확인하였다. 설계된 주파수 보다 shift down 되었지만 마진을 두어서 설계를 하였기 때문에 DTV 튜너로 사용할 수 있는 주파수 대역은 만족한다. 설계된 회로는 1.8V 전원 전압에서 23~27mA의 전류를 소모한다. 칩 면적은 PAD를 포함하여 $2.0mm{\times}1.5mm$이다. In this paper a wideband frequency synthesizer is designed for DTV tuners using a $0.18{\mu}m$ CMOS process. It satisfies the DTV frequency band(48~1675MHz). A scheme is proposed to cover the full band using only one VCO and reliable broadband characteristics are achieved by reducing the variations of VCO gains and frequency steps. The simulation results show that the designed VCO has frequency range of 1.85~4.22GHz, phase noise at 4.22GHz of -89.7dBc/Hz@100kHz, gains of 62.4~95.8MHz/V(${\pm}21.0%$) and frequency steps of 22.9~47.9MHz(${\pm}35.3%$). The designed VCO has a phase noise of -89.75dBc/Hz at 100kHz offset. The designed synthesizer has a lock time less than $0.15{\mu}s$. The measured VCO tuning range is 2.05~3.4GHz. The frequency range is shifted down but still satisfy the target range owing to the design for enough margin. The designed circuit consumes 23~27mA from a 1.8V supply, and the chip size including PADs is $2.0mm{\times}1.5mm$.