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김진환(Jinhwan Kim),박성만(Sungman Park),김상덕(Sangduck Kim),김성회(Sunghoe Kim),허훈(Hoon Heo) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to improve signal quality of Hall Effect sensor, lot of methods has been tried. One of the main concerns in getting better signal quality is to reduce the noise in sensing system. Nevertheless not much improvement has been achieved. Hall Effect principle is widely being used in many kinds of sensors. Open-loop current sensor utilizing Hall Effect sensor is studied in this paper. Primarily it is necessary to make exact modeling of current sensor for noise reduction of open type Hall effect sensor. In the study, the temperature variation and core characteristic of current sensor are not considered. Generally the basic characteristic of the noise in sensing system is random. Hence in the study a stochastic control technique is implemented to reduce the random noise in open-loop type Hall Effect sensor. Remarkable reduction of random noise in the original noisy signal which is frequently being observed from conventional open-loop type current sensor is demonstrated both in simulation and experiment as well.
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성인 코눈물관부분폐쇄에서 실리콘관삽입 후 마이토마이신 점안
송병용,김재덕,김상덕,Byeong Yong Song,Jae Duck Kim,Sangduck Kim 대한안과학회 2005 대한안과학회지 Vol.46 No.1
Purpose: This study nasolacrimal duct (NLD) stenosis in adult, evaluated the clinical results of treatment with topical 0.04% mitomycin C (MMC) eyedrops after silicone tube intubation. Methods: Prospectively, we analysed the clinical results from 29 eyes of 25 adult patients with epiphora due to NLD stenosis who underwent this procedure. Results: The mean follow-up periods was 9.3 months. Twenty-two eyes (76%) showed no epiphora and complete passing into the cavity by lacrimal irrigation. Four eyes (13.7%) showed intermittent epiphora but improvement relative to preoperative state. Three eyes (10.3%) showed persistent epiphora and no improvement. In total, 26 eyes (89%) showed improvement of symptoms. Complications were silicone tube prolapse in 5 eyes (17.2%) and dacryocystitis in 2 (6.9%) Conclusions: Silicone tube intubation with topical MMC eyedrops for treatment of patients with tearing due to NLD stenosis is effective, safe and easy. This technique can be tried before DCR if the surgeon has a thorough of nasal cavity anatomy and probing.
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코-눈물주머니 점막피판을 이용한 코경유눈물주머니코안연결술의 결과
정일원(Ilwon Jeong),김상덕(Sangduck Kim) 대한안과학회 2021 대한안과학회지 Vol.62 No.7
목적: 코눈물관폐쇄 환자에서 피판의 종류와 유무에 따른 수술 성공률을 평가해보고자 하였다. 대상과 방법: 전체 509안 중 피판을 이용하지 않은 환자군은 178안, 코점막피판만 이용한 환자군은 126안, 코-눈물주머니 점막피판을이용한 환자군은 205안을 후향적으로 비교하였다. 각 집단의 수술 후 1, 3, 6개월째의 육아종 형성, 골공 폐쇄를 비교하여 수술 성공률을 분석하였다. 결과: 수술 후 6개월째, 육아종 형성은 코-눈물주머니 점막피판에서 6안(2.93%), 코점막피판에서 5안(3.96%), 피판을 이용하지 않은 군에서 15안(8.42%)이었다. 골공 폐쇄는 코-눈물주머니 점막피판에서 3안(1.46%), 코점막피판에서 4안(2.38%), 피판을 이용하지 않은 군에서 6안(2.81%)이었다. 코-눈물주머니 점막피판을 이용한 환자군의 해부학적 수술 성공률은 95.61%로 코점막피판을 이용한 환자군(92.86%), 피판을 이용하지 않은 환자군(88.20%)보다 높았다. 기능적 및 해부학적 수술 성공률은 코-눈물주머니 점막피판을 이용한 환자군에서 94.15%, 코점막피판을 이용한 환자군에서 88.89%, 피판을 이용하지 않은 군에서 84.83%였다. 결론: 코-눈물주머니 점막피판을 이용한 코경유눈물주머니코안연결술은 육아종 형성 및 골공 폐쇄의 가능성을 최소화하는 효과적인 방법이다. Purpose: In patients with nasolacrimal duct obstruction, the outcomes of surgery were evaluated according to the type or presence of flaps. Methods: In total, 509 eyes were compared retrospectively: 178 eyes in patients treated without flaps, 126 eyes in patients treated using nasal mucosa flaps, and 205 eyes in the patient group using nasal and lacrimal sac mucosal flap were compared retrospectively. We analyzed the factors of success according to the surgical method by comparing granulation and bony ostium obstruction at 1, 3, and 6 months after surgery in each group. Results: At 6 months after surgery, granulation was found in 6 eyes (2.93%) in the nasal and lacrimal sac mucosal flap group, 5 eyes (3.96%) in the nasal mucosal flap group, and 15 eyes (8.42%) in the group treated without flaps. Bony ostium obstruction was found in 3 eyes (1.46%) in the nasal and lacrimal sac mucosal flap group, 4 eyes (2.38%) in the nasal mucosal flap group, and 6 eyes (2.81%) in the group treated without flaps. The anatomical surgical success rate of patients treated with nasal and lacrimal sac mucosal flaps was 95.61%, which was higher than those of patients treated with nasal mucosal flaps (92.86%) and without flaps (88.20%). The functional and anatomical surgical success rate was 94.15% in the group treated with nasal and lacrimal sac mucosal flaps, 88.89% in the group treated with nasal mucosal flaps, and 84.83% in the group treated without flaps. Conclusions: Endonasal dacryocystorhinostomy using the nasal and lacrimal sac mucosal flap is an effective method that minimizes the risk of granulation and bony ostium obstruction.
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