누소관 경유 다이오드 레이저를 이용한 내시경적 누낭비강연결 재개통술의 효과

유준호,이화,신형호,이종미,장민욱,백세현.Jun Ho Yoo. MD. Hwa Lee. MD. PhD. Hyung Ho Shin. MD. Jong Mee Lee. MD. Min Wook Jang. MD. PhD. Se Hyun Baek. MD. PhD 대한안과학회 2012 대한안과학회지 Vol.53 No.4

Purpose: To determine the intranasal causes of failed dacryocystorhinostomy (DCR) and the effects of transcanalicular diode laser-assisted revision surgery. Methods: Twenty-four patients (29 eyes) who underwent revision surgery for a failed DCR at the Department of Ophthalmology, Ansan Hospital, Korea University between March 2009 and February 2011 were included in the present retrospective study. The intranasal causes of failed DCR, the time of symptoms such as epiphora and discharge after DCR, success rates of revision surgeries and follow-up periods were evaluated. Results: Membranous obstruction was found in 25 eyes (86.2%) and was accompanied with granuloma in 10 eyes; these were the most common causes of failed DCR. The mean time for symptom development after DCR was 14.6 months, the success rate of the first revision surgery was 82.1% and good results were obtained in 5 eyes after the second revision surgery. Recurrence developed in 2 eyes, but symptoms improved after the lateral tarsal strip procedure. Conclusions: Membranous obstruction was the most common intranasal cause of failed DCR and transcanalicular diode laser-assisted revision surgery produced good results. Additionally, in patients with persistent epiphora following anatomically- patent revisional surgery, lacrimal pump failure due to lower eyelid laxity should be considered and corrected. J Korean Ophthalmol Soc 2012;53(4):493-498

개에서 주사 및 도입마취제로서 Propofol의 마취효과 및 심폐기능에 미치는 영향

유준호,이충호,김완희,남치주,권오경,Yoo, Jun-ho,Lee, Chung-ho,Kim, Wan-Hee,Nam, Tchi-chou,Kweon, Oh-kyeong 대한수의학회 2002 大韓獸醫學會誌 Vol.42 No.1

To investigate the cardiopulmonary and anesthetic effects of propofol in dogs, experimental dogs were randomly divided into 4 groups (propofol infusion anesthesia, P/INF, propofol intermittent anesthesia, P/INTER, propofol induction anesthesia, P/ISO, thiopental Na induction anesthesia, T/ISO) and monitored analgesic and anesthetic effects, recovery time, body temperature, heart rate, mean arterial pressure, respiratory rate, systolic and diastolic pressure. In all groups, apnea was not observed. In the P/INF group, the respiratory rate(RR) was slightly decreased, but in the P/INTER group, RR was increased and shallowing. In the groups of P/ISO and T/ISO, the respiratory rate was decreased. Heart rate(HR) was increased after induction anesthesia in all groups, but gradually decreased. Mean arterial pressure(MAP) was decreased after injection anesthesia in the groups of P/INF and P/INTER. In the groups of P/ISO and T/ISO, however, MAP was slightly increased. Systolic and diastolic arterial pressure were gradually decreased after induction anesthesia, but not significantly. In the groups of P/INF and P/ISO, recovery time was shorter than the groups of P/INTER and T/ISO. In all groups, body temperature of animals was decreased gradually according to time but no significant changes were observed. Propofol injection doesn't make the complete loss of responses of animals, especially, in the P/INTER group. In the P/INF group, deep pain was present until the end of anesthetic period. During recovery period, any other side effects except incoordination were not monitored. The present study suggested that infusion anesthesia was superior to intermittent anesthesia as injection anesthetic agent, and propofol was better than thiopental Na as induction anesthetic agent.

안외상의 통계적 고찰과 안외상 점수를 통한 평가

유준호,이화,이종미,이태수,백세현,Jun Ho Yoo,Hwa Lee,Jongmi Lee,Tae Soo Lee,Sehyun Baek 대한안과학회 2011 대한안과학회지 Vol.52 No.9

Purpose: To investigate the clinical characteristics of ocular injuries for the prevention and predictability of visual prognosis and the treatment of ocular injuries using the ocular trauma score. Methods: A retrospective survey was performed in 1341 eyes of 1257 patients, who visited Korea University Medical Center from May 2009 to December 2009. The sex, age, causes, diagnosis, primary ocular surgery, injury site, initial and final visual acuities and complications were statistically reviewed. The ocular trauma score was calculated by assigning certain numerical raw points to the following six variables: initial visual acuity, globe rupture, endophthalmitis, perforating injury, retinal detachment, and a relative afferent pupillary defect. The correlation of the ocular traumascore with the final visual acuity was investigated. Results: The incidence of ocular injuries was higher in males (79.0%) than in females and was more common in people in their 40s and 20s respectively. Among the patient the diagnoses, corneal erosion was most common in males, orbital wall fracture was most common in females, and corneal erosion, orbital wall fracture, orbital contusion, and hyphema were most common overall. An ocular trauma score was less than 44 in 6 eyes (0.7%), 9 eyes (1.0%) between a score of 45 and 65, 48 eyes (5.2%) between a score of 66 and 80, 122 eyes (13.2%) between a score of 81 and 90, and 737 eyes (79.9%) between a score of 91 and 100. Conclusions: The present study determined that the ocular trauma score showed a good visual predictive value and could be used in prevention and treatment of ocular injuries. J Korean Ophthalmol Soc 2011;52(9):1024-1029

JSEG 영상 분할을 이용한 손 영역 검출

유준호(Jun-Ho Yoo),강대성(Dae-Seong Kang) 한국정보기술학회 2012 Proceedings of KIIT Conference Vol.2012 No.5

본 논문에서는 손 영역 검출을 할 수 있는 방법론을 제안한다. 영역 분할 알고리즘 중에서 독립적으로 처리되는 단계 안에서는 색상 양자화와 공간적으로 분할 처리되어 분리되는 JSEG를 이용하여 영역을 분할 하고, 손 영억으로 판단할 색상인 피부색을 조명 변화에 간섭이 비교적 작은 YCbCr 칼라 모델을 이용하여 분할된 영역에서 손 영역 후보군을 찾는다. 마지막으로 손 영역 후보군 중에서 어떠한 영역이 최종 손 영역인지를 결정하는 판별 조건에 의해 최종 손 영역을 결정한다. JSEG 영역 분할을 이용하여 복잡한 배경과 YCbCr 칼라 모델을 이용하여 조명 변화를 줄여 손 영역을 검출 실험 결과 높은 정확도를 보여주었다. This paper proposes method of hand region detection. Color quantization and spatial segmentation are separated by J-value segmentation(JSEG) which is independently processed of segmentation algorithm and candidates of hand region are searched for using YCbCr color model which relatively interfere with little change of illumination and using skin color of hand region . Finally, some region of candidate is decided by final hand region through terms of discrimination. Because change of illumination is reduced by using region segmentation of JSEG, complex background and YCbCr color model, the result of an experiment show high accuracy.

영상 분할 알고리즘에서 개선된 PGF를 이용하여 손 영역 검출을 위한 실시간 처리에 관한 연구

유준호(Jun-Ho Yoo),강대성(Dae-Seong Kang) 한국정보기술학회 2012 한국정보기술학회논문지 Vol.10 No.12

In this paper, we proposed a study on real-time processing for hand region detection using modified peer group filtering(PGF) at an image segmentation algorithm. The region is segmented by JSEG algorithm for the hand region detection. This algorithm is divided into independent color quantization and spatial segmentation steps. The modified PGF(MPGF) is applied to color quantization step for real-time processing. Candidates of hand region are searched for using YCbCr color model which is not relatively interfered with change of illumination about skin color of hand region. Lastly, the final hand region among candidated hand regions is decided by the terms of discrimination. Comparative results from experiments show that the proposed method has 6% improved performance in terms of accuracy.

망막대동맥류의 임상 경과

유준호(Jun Ho Yoo),김성우(Seong-Woo Kim),오재령(Jaeryung Oh) 대한검안학회 2017 Annals of optometry and contact lens Vol.16 No.3

Purpose: To evaluate the clinical aspects and outcomes of eyes with retinal arterial macroaneurysm. Methods: From March 2011 to December 2016, we retrospectively reviewed the medical records of patients diagnosed with retinal arterial macroaneurysm and investigated the baseline visual acuity, final visual acuity, location and type of the retinal arterial macroaneurysm. Results: Twenty-eight eyes of 28 patients were included in the study and 23 (82%) of them were female. Retinal arterial macroaneurysm were more common in the superotemporal retina, and hemorrhagic type was in 19 eyes (68%), exudative type was in 9 eyes (32%) respectively. Twenty-one eyes (75%) were treated with focal laser photocoagulation or intravitreal bevacizumab injection or vitrectomy according to the physician s judgment, and the remaining 7 eyes (25%) were observed without any treatment. The visual acuity improved in both observation and treatment groups, but there was no statistically significant difference in the baseline and final visual acuity between two groups (p=0.140, 0.959, respectively). Conclusions: All of the treatment methods for retinal arterial aneurysms in this study were all effective and the patient s overall visual prognosis was good. The choice of appropriate treatment modalities according to the clinical features of the retinal arterial aneurysms may be helpful for visual prognosis.

생체정보를 활용한 중증환자들을 위한 응급 모니터링 시스템

염승환(Seung-Hwan Yeom),유준호(Jun-Ho Yoo),강대성(Dae-Seong Kang) 한국정보기술학회 2012 Proceedings of KIIT Conference Vol.2012 No.5

본 논문은 생체정보를 활용한 중증환자들을 위한 응급 모니터링 시스템을 구현하였다. 우리나라 65세 이상 노인 인주 중 잠재적인 치매 및 중증환자의 발생 비율은 6.8 ~ 13%가 되며 이로 인한 치매 및 중증환자 인구의 증가는 지속될 것으로 보인다. 그러나 증가되는 환자들의 비율에 비해 이들을 부양해야 하는 인력과 시설은 한정되어 있다. 이런 인력과 시설의 부족 현상을 어느 정도 해결하기 위해 본 논문은 응급 모니터링 시스템을 제안한다. 이 시스템은 치매 및 중증환자의 대소변을 온습도계 센서를 이용하여 신속하게 감지하여 이들을 효과적으로 대처 및 관리할 수 있다. 대소변 상황을 결정하여 부양인과 담당자에서 통보해줌으로써 직접 눈, 코로 확인해야 하는 번거로운 작업들을 대체할 수 있는 시스템이다. In this paper, we make a emergency monitoring system(EMS) using the vital sign information of patients. A rate of potential dementia over the age of 65 in korea is 6.8 to 13%. The increasing of dementia population is expected to last. But manpower and facility is limited in comparison with increasing the rate of dementia. this paper proposes a emergency monitoring system to settle inadequacy of manpower and facility. This system using thermo-hygrometer rapidly tracks urine and feces of dementia and we effectively manage them. This system decides the condition of urine and feces and substitute inconvenient work using the eyes and the nose by notifying the nurse and the person in charge.

해상풍력발전기 고장진단을 위한 실시간 자동 모니터링 시스템 구현

박상준(Sang-June Park),유준호(Jun-Ho Yoo),강대성(Dae-Seong Kang) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.4-2

Trimethoprim / Sulfamethoxazole ( TMP / SMX ) 을 복용 중인 외래 환자에서 발생하는 경구 칼륨 투여 후 칼륨 대사 장애

최춘식(Chun Sik Choi),유영조(Young Jo Yoo),김태영(Tae Young Kim),민경환(Kyung Hwan Min),한상웅(Sang Woong Han),노광호(Kwang Ho Roh),양성규(Seong Kyu Yang),유준호(Jun Ho Yoo),오석중(Suk Joong Oh),문중돈(Jung Don Mun),김호중(Ho Jung Ki 대한내과학회 1999 대한내과학회지 Vol.57 No.1

N/A TMP/SMX has been shown to cause hyperkalemia in a few outpatients on standard-dose. This prospective study was aimed at investigating other associated factors inducing clinically important hyperkalemia in outpatients on standard-dose of TMP/SMX. Methods : Age-matched diabetic(n=22) and non-diabetic (n=20) patients with UTI on standard dose of TMP/SMX for 5 days were given acute oral intake of 40 mEq of potassium chloride(KCl). Results : Before the intake of TMP/SMX, basal levels of serum potassium(K), serum BUN and creatinine, plasma renin activity(PRA), aldosterone(PA), and transtubular potassium gradient(TTKG) were comparable between diabetic and non-diabetic subjects. Also after TMP/SMX was taken, all parameters didnt reveal any overt changes except a slightly increased serum K but not significantly (from 4.20±0.15 to 4.14±0.21mEq/L in non-diabetics; from 4.13±0.18 to 4.25±0.13mEq/L in diabetics). Following acute oral KCl load, however, the peak increases of serum K changes were significantly higher in diabetics compared to non-diabetics(0.34 0.06 vs 0.62 0.09mEq/L, p<0.01). Furthermore, 8 out of 22 diabetics but none of non-diabetics after acute KCl load developed hyperkalemia(> 5.0 mEq/L). After KCl load, PRA did not show any significant changes, whereas PA was increased simultaneously with the increments of serum K in both diabetic subgroups hyperkalemic(n=8) and normokalemic (n=14) diabetics. But increment was blunted in hyperkalemic diabetic subgroup. TTKG was increased prominently in normokalemic diabetic subgroup(9.20 from 4.50), while it was slightly increased in hyperkalemic diabetic subgroup(4.63 from 3.79mEq/L). There was statistical difference between two subgroups(p < 0.05). In conclusion, Besides the known effect of blocking sodium channels in distal K secreting cells by TMP/SMX, insulinopenia(DM). Hypoaldosteronism with its decreased tubular bioactivity, and increased exogenous K intake in concert could cause clinically overt hyperkalemia on standard-dose of TMP/SMX. When standard- dose of TMP/SMX is administered to patients with deranged K homeostasis, especially to diabetics with hypoaldosteronism, blood K level should be monitored meticulously to avoid hyperkalemia.

PilotNet 성능향상을 위한 SLAM과 YOLO 활용

고강현(Kang-Hyun Ko),김성민(Sung-Min Kim),유준호(Jun-Ho Yoo),박건우(Geon-Woo Park),임수현(Su-Hyun Rim),황성수(Sung-Soo Hwang) 대한전자공학회 2023 대한전자공학회 학술대회 Vol.2023 No.6

PilotNet, based on end-to-end deep learning, enables self-driving for a designated driving section without additional programming by imitating the drivers driving process. However, since PilotNet cannot detect a pedestrian, an accident may occur if it encounters a pedestrian while driving. In addition, there is also a problem when the vehicle is out of a predetermined driving section because the current location is not recognized. In conclusion, the existing PilotNet lacks stability in driving. Therefore, in this study, we propose a method to improve the safety and accuracy of autonomous driving by recognizing pedestrians and locating vehicles using YOLO and SLAM for the better performance of PilotNet. With YOLO, the vehicle will make an emergency stop if a pedestrian approaches. With SLAM, based on the map stored in advance, the vehicle will make an emergency stop if the vehicle deviates from the designated driving section. PilotNet with improved performance was executed with a model vehicle. As for the test results of this study, autonomous driving was possible with a success rate of 100% for emergency stops due to pedestrians approaching dangerous distances and 28.57% for emergency stops when they deviated from the designated section. These results in the study suggest that it is possible to improve the performance of PilotNet by using YOLO and SLAM.