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최지철,진홍률,문영은,김민상,최미영,심우섭,오재광,김현아 대한이비인후과학회 2009 Clinical and Experimental Otorhinolaryngology Vol.2 No.3
Objectives. Many factors influence the outcome of endoscopic dacryocystorhinostomy (DCR). One of the most important prognostic factors is the level of obstruction in the lacrimal drainage system. The main objective of this report is to evaluate both the frequency of obstruction by anatomical region of the lacrimal drainage system on dacryocystography (DCG) and the surgical outcome of endoscopic DCR according to the obstruction level. Methods. A retrospective series of 48 patients (60 eyes) who had undergone endoscopic DCR from January 2005 to November 2007 were enrolled. Preoperative evaluation consisted of a standard examination which included lacrimal irrigation, probing, DCG and osteomeatal unit (OMU) computed tomography. Patients were classified into four groups according to the obstruction level on DCG. Surgical outcome was evaluated postoperatively by subjective improvement of epiphora and patent rhinostomy opening on nasal endoscopic exam. Results. Of 60 eyes, the levels of obstruction were the common canaliculus in 14 eyes (23.3%), the lacrimal sac in 13 eyes (21.7%), the duct-sac junction in 13 eyes (21.7%) and the nasolacrimal duct (NLD) in 20 eyes (33.3%). The ductsac junction obstruction was treated most successfully (100%), followed by NLD obstruction (90%), common canaliculus obstruction (78.6%) and saccal obstruction (69.2%). Conclusion. In patients with lacrimal drainage system obstruction, preoperative evaluation of obstruction level using DCG may be helpful for predicting the surgical outcome of endoscopic DCR. The saccal obstruction may have a worse prognosis than the other obstruction levels. Objectives. Many factors influence the outcome of endoscopic dacryocystorhinostomy (DCR). One of the most important prognostic factors is the level of obstruction in the lacrimal drainage system. The main objective of this report is to evaluate both the frequency of obstruction by anatomical region of the lacrimal drainage system on dacryocystography (DCG) and the surgical outcome of endoscopic DCR according to the obstruction level. Methods. A retrospective series of 48 patients (60 eyes) who had undergone endoscopic DCR from January 2005 to November 2007 were enrolled. Preoperative evaluation consisted of a standard examination which included lacrimal irrigation, probing, DCG and osteomeatal unit (OMU) computed tomography. Patients were classified into four groups according to the obstruction level on DCG. Surgical outcome was evaluated postoperatively by subjective improvement of epiphora and patent rhinostomy opening on nasal endoscopic exam. Results. Of 60 eyes, the levels of obstruction were the common canaliculus in 14 eyes (23.3%), the lacrimal sac in 13 eyes (21.7%), the duct-sac junction in 13 eyes (21.7%) and the nasolacrimal duct (NLD) in 20 eyes (33.3%). The ductsac junction obstruction was treated most successfully (100%), followed by NLD obstruction (90%), common canaliculus obstruction (78.6%) and saccal obstruction (69.2%). Conclusion. In patients with lacrimal drainage system obstruction, preoperative evaluation of obstruction level using DCG may be helpful for predicting the surgical outcome of endoscopic DCR. The saccal obstruction may have a worse prognosis than the other obstruction levels.
FTA가 한국 전기전자산업의 환경 성과에 미치는 영향 분석
최지철(Ji-Cheol Choi),우차오(Chao Wu),오근엽(Keun-Yeob Oh) 한국무역연구원 2020 무역연구 Vol.16 No.2
Purpose– This paper analyzes the effects of FTA on the environmental performances of Korean Electrotechnics and Electronics manufacturing firms. Design/methodology/approach–We used the data of Target Management Enterprises(TMEs) firms that are regulated by the government in the area of greenhouse gas and energy. We investigated the changes in environmental performances of the firms after spread of the FTA(2011). This study applied DEA(Data Envelopment Analysis) in order to measure the environmental performance, which can provide the Malmquist index and Malmquist-Luenberger index. Findings– As a result of the analysis, we found that the productivity of firms was lowered as the environmental regulation started but the environmental improvement effect gradually increased by regression analysis. These results show that firms are in accordance with the government’s environmental policy and the FTA had a positive impact on the environmental performances. Research Implications or Originality–Unlike previous studies, actual environmental performance was analyzed using corporate data. In particular, it is meaningful that new indicators have been presented to this end, and we can show the effects of environmental improvement effects in terms of quantitative measure.
문영은,양승덕,최지철,김민상,오재광,김현아,김동활,신시옥 대한이비인후과학회 2009 대한이비인후과학회지 두경부외과학 Vol.52 No.10
Background and Objectives Sudden deafness, an important disease characterized by abrupt sensorineural hearing loss, is rare in children and the prognosis in children is accepted to be worse than that in adults. However, clinical studies are not sufficient to define the clinical characteristics and prognosis of sudden deafness in children. The author analyzed clinical manifestation of sudden deafness in children and compared the treatment results of children with those of adults. Subjects and Method A retrospective analysis was performed in 25 patients (29 ears) who were treated for sudden deafness from January 1993 to May 2008. Results 1) The overall hearing recovery rate (79%) was significantly higher in adults (53.7%). The prognosis in children less than 10 years old (73%) was also higher than that in adults. 2) The rate of complete recovery (61%) was higher in children than in adults (38.5%). Conclusion The sudden deafness in children has unique clinical characteristics and the recovery rate is more favorable than in adults.
진홍률,심우섭,신시옥,최영석,문영은,유승두,최지철 대한이비인후과학회 2008 대한이비인후과학회지 두경부외과학 Vol.51 No.9
The timing of surgery is an important consideration point in the management of blowout fracture (BOF) of the orbit. This study aimed to compare the surgical outcome of early and delayed reduction and to suggest the best timing of surgery in the pure medial BOF of the orbit. Subjects and Method:Fifty-two patients who had endoscopic endonasal reduction of medial BOF were studied retrospectively. Patients were divided into an early group (N=42) who had surgery within one month after the trauma and a delayed group (N=10) who had surgery after one month from the trauma. Surgical indications, results of the surgery, and complications were compared between the two groups. Results:The surgical indications in the early group were persistent diplopia, large defect expecting later enophthalmos and limitation of EOM, whereas the delayed group complained mainly of enophthalmos and diplopia. There were no significant differences in surgical outcomes and the rate of complications between the two groups. Conclusion:When patients with pure medial BOF have large defects without any persistent diplopia and limitation of EOM, surgery would be safely deferred until significant enophthalmos occurs. (Korean J Otorhinolaryngol-Head Neck Surg 2008;51:796-9)
전세종(Sejong Chun),최용문(Yong Moon Choi),최해만(Hae Man Choi),최지철(Ji Chul Choi),홍경기(Kyung Ki Hong),한상우(Sang Woo Han),김웅선(Woong Sun Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The averaging pitot tube or annubar is widely employed to measure the flow rate of the pollutants discharged from the chimney in many industrial situations. Accurate monitoring of the amount of the discharged pollutants necessitates the annubar calibration, which is usually performed in wind tunnels and the calibration conditions are dependent on the size of the wind tunnel test section. However, there are many situations where annubars are larger than the typical size of wind tunnel test sections. In the present study, a new technique using partial blockage was proposed, enabling calibrations of large annubars in various configurations. The results demonstrated favorable agreements with the original annubar coefficients.