t-분포를 이용한 의사-전체검사에 관한 연구

조형철,이정현,이강현 조선대학교 에너지.자원신기술연구소 2002 에너지·자원신기술연구소 논문지 Vol.24 No.1

This paper deals with the path sensitization algorithm from PI to PO center on the nodes of high testability mainstay when CUT is tested by pseudo-exhaustive testing. Focusing on the defined nodes of high testability mainstay, we performed the singular cover and consistency operation to the forward and backward logic gates. Thus, we easily generated the pseudo-exhaustive test patterns. As a result, (1-α) region has 0.1579 and the pseudo-exhaustive test patterns are least generated and the rate of test pattern is 1.22%, compared with exhaustive testing. (1-α region has 0.2368 and this result exhibits the optimal performance of the singular cover and consistency operation. Applying the generated pseudo-exhaustive test patterns to the stuck at faults existing on the inputs and internal nodes in CUT, we verified this performance on the output. Thus, it is confirmed that fuctional testing of the proposed path sensitization algorithm is very useful.

The Effect of Convergence Vision Therapy on Symptoms and Visual Perception in Children with ADHD tendency

조형철,노효련 한국융합학회 2020 한국융합학회논문지 Vol.11 No.7

The purpose of this study is to determine whether vision therapy improves symptom and visual perceptual skills in children with attention deficit hyperactivity disorder tendency who have visual problems. The subjects of this study were 10 children. Before and after vision therapy, the visual function test, developmental test of visual-motor integration, test of visual perceptual skills, and ADHD rating scale test were performed. Vision therapy was conducted twice a week for a period of 6 months to 1 year. After vision therapy, all subjects achieved normal ranges of visual function, sensory fusion, stereoacuity, vergence function, and convergence. The visual function and visual perceptual skill were improved and the score for ADHD symptoms was reduced. Therefore, it seems that vision therapy can be used to improve the symptoms and visual perception of children with ADHD.

간헐성 외사시 수술 후 시각 기능과 입체시 기능에 대한 융복합적 평가

조형철,노효련,이희제 한국융합학회 2022 한국융합학회논문지 Vol.13 No.4

본 논문은 간헐성 외사시 수술 이후 시각 기능과 입체시 기능을 평가하였다. 본 연구의 대상자는 간헐성 외사시로 진단받고, 사시 수술을 받은 18명(남: 10명, 여: 8명)으로 평균연령은 12.06±5.43세이다. 연구대상자들은 사시수술을 1회 받은 경우가 72.2%, 2회 받은 경우가 27.8%이었다. 이들을 대상으로 시각 기능과 입체시 기능을 검사하였다. 자료 분석은 빈도분석과, 교차분석, 상관관계 분석을 이용하였으며, 통계학적 유의성은 p<.05로 설정하였다. 사시수술 후의 편위 상태에서는 외편위는 72.2%로 가장 많았으며, 원거리 감각융합에서는 복시(50.0%), 억제(33.3%) 순이었다. 근거리 감각융합에서는 융합(50.0%), 복시(44.4%) 순이었다. 사시수술 후 원거리 입체시맹 대상자는 61.1%로 가장 많았으며 정상범위인 40-60arcsec인 대상자는 없었다. 근거리 입체시맹 대상자는 33.3%로 가장 많았으며 40-60arcsec인 대상자는 1.1%이었다. 간헐성 외사시 수술을 시행하였다 할지라도 편위상태, 입체시 및 감각융합에서 개선이 되지 않는 부분이 있는 것으로 나타났다. 따라서, 간헐성 외사시의 수술 전후에 사시에 대한 비수술적 방법을 통한 관리와 통제가 필요하다. This paper evaluated visual function and stereoacuity function after surgery for intermittent exotropia. Subjects of this study were 18 patients (male: n = 10, female: n = 8) mean aged 12.06±5.43 years diagnosed with intermittent exotropia who underwent strabismus surgery. Of these subjects, 72.2% of the subjects underwent strabismus surgery once and 27.8% had it twice. Visual function and stereoacuity function were tested for these subjects. For data analysis, frequency analysis, cross analysis, and correlation analysis were used, and statistical significance was set at p<.05. Regarding the deviation state after strabismus surgery, exodeviation accounted for the most(72.2%), followed by diplopia(50.0%) and suppression(33.3%) for distance sensory fusion. Regarding near sensory fusion, fusion(50.0%) accounted for the most, followed by diplopia(44.4%). After strabismus surgery, subjects with distance stereoacuity blindness were the most at 61.1% and there were no subjects with a normal range of 40-60 arcsec. Near stereoacuity blindness subjects accounted for 33.3% and subjects with 40-60 arcsec accounted for 1.1%. Even after surgery for intermittent exotropia, there were some areas that did not improve in deviation state, stereoacuity, or sensory fusion. Therefore, it is necessary to manage and control strabismus through non-surgical methods before and after surgery for intermittent exotropia.

CaNb₂O₆:RE³⁺ (RE = Dy, Eu, Dy/Eu) 형광체의 발광 특성

조형철,조신호,Cho, Hyungchel,Cho, Shinho 한국재료학회 2017 한국재료학회지 Vol.27 No.6

A series of $CaNb_2O_6:Dy^{3+}$, $CaNb_2O_6$:$Eu^{3+}$ and $CaNb_2O_6:Dy^{3+}$, $Eu^{3+}$ phosphors were prepared by solid-state reaction process. The effects of activator ions on the structural, morphological and optical properties of the phosphor particles were investigated. XRD patterns showed that all the phosphors had an orthorhombic system with a main (131) diffraction peak. For the $Dy^{3+}$-doped $CaNb_2O_6$ phosphor powders, the excitation spectra consisted of one broad band centered at 267 nm in the range of 210-310 nm and three weak peaks; the main emission band showed an intense yellow band at 575 nm that corresponded to the $^4F_{9/2}{\rightarrow}^6H_{13/2}$ transition of $Dy^{3+}$ ions. For the $Eu^{3+}$-doped $CaNb_2O_6$ phosphor, the emission spectra under ultraviolet excitation at 263 nm exhibited one strong reddish-orange band centered at 612 nm and four weak bands at 536, 593, 650, and 705 nm. For the $Dy^{3+}$ and $Eu^{3+}$-codoped $CaNb_2O_6$ phosphor powders, blue and yellow emission bands due to the $^4F_{9/2}{\rightarrow}^6H_{15/2}$ and $^4F_{9/2}{\rightarrow}^6H_{13/2}$ transitions of $Dy^{3+}$ ions and a main reddish-orange emission line at 612 nm resulting from the $^5D_0{\rightarrow}^7F_2$ transition of $Eu^{3+}$ ions were observed. As the concentration of $Eu^{3+}$ ions increased from 1 mol% to 10 mol%, the intensities of the emissions due to $Dy^{3+}$ ions rapidly decreased, while those of the emission bands originating from the $Eu^{3+}$ ions gradually increased, reached maxima at 10 mol%, and then slightly decreased at 15 mol% of $Eu^{3+}$. These results indicate that white light emission can be achieved by modulating the concentrations of the $Eu^{3+}$ ions incorporated into the $Dy^{3+}$-doped $CaNb_2O_6$ host lattice.

시지각 훈련이 사이버 멀미에 대한 융복합적 효과

조형철,노효련,이희제 한국융합학회 2022 한국융합학회논문지 Vol.13 No.2

The purpose of this paper was to investigate the relationship between cybersickness symptoms and visual function and to determine whether visual perception training is effective in reducing symptoms of cybersickness. The study subjects were healthy adult males who experienced the same virtual reality program for 15 minutes. Afterwards, the VR satisfaction score and cybersickness level were measured and classified into a comfortable virtual reality program viewer group (CVR group, 20 people) and an uncomfortable virtual reality program viewer group (UVR group, 20 people). Visual function test was performed on all subjects, and the vision therapy training program was applied to the UVR group once a week for 40 minutes 12 times, and then the visual function and SSQ questionnaire were re-evaluated. Subjects with diplopia were 55% in the UVR group and 5% in the CVR group, which was significantly higher in the UVR group, there were differences in stereopsis, exophoria, near point convergence(p<.01) and vergence function(p<.001) between the two groups. After vision therapy, changes in SSQ, stereopsis, near point convergence, and vergence function of UVR user group were positively changed(p<.01). Therefore, cybersickness symptoms are related to visual function, it seems that the vision therapy can be used as a way to alleviate the symptoms of cybersickness. 본 논문은 사이버 멀미 증상과 시각 기능과의 관련성을 알아보고 시지각훈련이 사이버 멀미의 증상을 감소시키는 효과가 있는지 알아보고자 하였다. 연구 대상자는 건강한 성인 남성으로, 15분 동안 동일한 가상 현실 프로그램을 체험하도록 한 이후, VR 만족도 점수와 사이버 멀미 수준에 따라 편안한 가상현실 프로그램 시청자 그룹(CVR 20명)과 불편한 가상현실 프로그램 시청자 그룹(UVR 20명)으로 분류하였다. 모든 대상자에게 시각기능 검사를 실시하였고 UVR 그룹에게 시지각 훈련 프로그램을 주 1회 40분 12회 적용한 후 시각 기능과 SSQ 설문지를 재평가하였다. 복시를 가진 대상자는 UVR 그룹에서 55%, CVR 그룹에서 5%로 나타나서 UVR 그룹에서 월등히 높았으며, 두 그룹간의 입체시, 외사위, 폭주근점(p<.01) 및 버전스 기능(p<.001)은 차이가 나타났다. 시지각 훈련 후 UVR 사용자 그룹의 SSQ, 입체시, 폭주 근점, 버전스 기능의 변화가 긍정적으로 변화하였다(p<.01). 따라서, 사이버 멀미 증상은 시각기능과 관련이 있으며, 시지각 프로그램은 사이버 멀미 증상을 완화시키는 방법으로 사용될 수 있을 것으로 보인다.

민주당 서면 인터뷰

조형철 열린전북 2004 열린전북 Vol.2004 No.2

사골포 골점막 피판을 이용한 안와 내벽 골절의경비강 내시경적 정복술에 대한 임상적 고찰

조형철,김성윤,강무현,장민희,곽희붕,백준,이종원,최정섭 대한이비인후과학회 2006 대한이비인후과학회지 두경부외과학 Vol.49 No.7

Background and Objectives:Various surgical approaches have been employed to treat fractures of the medial orbital wall. Among them, the transnasal endoscopic approach provides the chance to avoid external scars and to observe the fracture site clearly. These approaches mostly require the use of grafts or splints. Authors carried out a retrospective study on the blowout fractures repaired by bulla ethmoidalis osteomucosal flap (BOMF) and compared them with the groups that were treated with silastic sheet only and with Med-pore to investigate the merits of BOMF with respect to results and complications. Subjects and Method: We reviewed 62 cases (64 sides) of medial wall fractures that were treated surgically. They were diagnosed with 3 mm facial CT scans and treated according to the authors’ indications from February 1998 to March 2004 at Namgwang Hospital, Seonam University. The surgical treatment consisted of the reconstruction of the fractures and the repair of the remaining bone defects by graft and splint, and the type of graft was selected according to the size of the defect. For minor defects, silastic sheet was used alone, whereas major defects were repaired with BOMF or Med-pore. All patients were evaluated regularly for at least six months postoperatively. Results:There were no differences in the aspects of the final treatment results of diplopia and enopthalmos. Butin the aspects of postoperative crust formation and granulation, the cases that were repaired with BOMF showed better results as well as the economic merits. In the BOMF cases, the average duration of silastic sheet stenting was 12.5 days and it could reduce the follow up period. Conclusion:BOMF demonstrated better results in the respects of duration of silastic sheet stenting, postoperative crust formation, granulation and economic cost. (Korean J Otolaryngol 2006;49:699-705)

보건산업체 개방형 혁신 촉진지원 사업 제안

조형철,손호선,이영성 한국기술혁신학회 2013 한국기술혁신학회 학술대회 발표논문집 Vol.2013 No.10

ICPES 2012를 다녀와서

조형철 대한전기학회 2012 전기의 세계 Vol.61 No.6

이하선 결핵 1예

조형철,김성윤,강무현,주영민 대한이비인후과학회 2004 대한이비인후과학회지 두경부외과학 Vol.47 No.3

Tuberculosis of the salivary gland is a very rare disease and the incidence of the primary lesion more frequently involves the submandibular or sublingual glands more frequently than in the parotid. It is asociated with pulmonary tuberculosis and occurs in one of two forms - an acute inflammatory lesion or a chronic granulomatous lesion. In particular, the chronic granulomatous lesion presents a dificult diagnostic problem because it may mimic the more comon tumorous lesion: usually, it is diagnosed after the excision biopsy. We have recently experienced a case of parotid tuberculosis that was diagnosed as the pleomorphic with a review of literature. (Korean J Otolaryngol 2004 ;47 :275-8)