• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.106-109
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• 2004

In this project, we have developed the eye-safe LRF system of 1.54 ${\mu}{\textrm}{m}$ wavelength using OPO. The maximum measured distance was 3.7km in outdoor experiment. We used Nd：YAG (1064nm) as a laser medium. It was applied BBO to construct the system. We also developed a time-counter for the range finder using a method of TOF (time of flight). The counter-clock used at the time counter was 320MHz making resolution within $\pm$1m. Start and stop signals were detected by two channel systems using PIN and APD. The LRF's repetition rate was 4 times per minute. The energy was measured to be over 9mJ. And, pulse-duration was 23ns. Resolution was $\pm$2m at the distance measurement using a target.

• 한국광학회:학술대회논문집
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• 한국광학회 2005년도 제16회 정기총회 및 동계학술발표회
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• pp.124-125
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• 2005

• 대한전자공학회논문지SP
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• 제49권3호
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• pp.30-39
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• 2012

본 논문에서는 검출된 운전자의 얼굴영역에서 눈의 형태를 인식하여 졸음 상태를 감지하는 기법을 개발하고 감지 결과에 따라 위험 상태를 알려주는 경보 시스템을 구현하고자 한다. 먼저 얼굴 검출에는 Haar 변환 기법을 이용하고 실험실환경, 차량환경 및 적외선 영상을 획득하여 다양한 조명 환경에서도 강인하도록 전처리 및 후처리 과정을 적용한다. 눈 검출에는 보통 한국인이라는 가정하에 눈의 위치 및 크기의 비례 구조 특성 등을 이용하여 후보 영역을 제한하고 트리구조에 대한 실험 결과로 고속 알고리즘을 구현하였다. 또한 졸음 상태를 인식하기 위해서는 눈의 개폐 형태를 검출할 수 있는 Hough 변환을 이용한 기법과 눈의 계폐에 따른 눈의 형태 비율을 이용한 기법을 새로이 제안하며, 눈이 감겨있는 시간을 측정하여 졸음 여부를 판단한다. 1단계 졸음 상태로 판단될 경우 통합 모니터링 인터페이스에서 운전자에게 경고음을 울리며 2단계 졸음 상태로 판단될 경우에는 CAN(Controller Area Network)을 통하여 안전벨트를 진동하게 함으로써 운전자에게 경고를 하는 시스템을 구현한다. 본 논문에서 제안하는 기법은 기존의 기법들과 비교하여 실험실 환경에서 평균 83.64% 이상의 검출률을 달성 하였으며, 실제 차량환경에서도 실험 결과를 통하여 평균적으로 우수한 결과를 보였다.

• 한국멀티미디어학회논문지
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• 제20권6호
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• pp.873-881
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• 2017

Prevention of drowsy driving is one of the important issues for safe driving. In this study, the algorithm for detection of drowsy driving has been developed. The algorithm was implemented by applying template matching and line profile, which detects eye blink. The accuracy of eye detection and blink detection was $97.45{\pm}3.67%$ and $98.50{\pm}0.92%$, which was resulted from the verification experiment that 21 subjects participated. Consequently, the algorithm is expected to be used to prevent sleep-deprived driving.

• 한국유기농업학회지
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• 제30권3호
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• pp.423-439
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• 2022

The acute dermal and eye irritation tests of Photorhabdus temperata, a symbiotic bacterium of Heterorhabditis megidis Gwangju strain, were carried out in New Zealand white rabbit (Oryctolagus cuniculus), following the guidelines of OECD and Rural Development Administration (RDA) of Korea. In both tests, neither dermal nor eye responses were found from all the P. temperata treated rabbits and the results were classified as non-irritating. That is, erythema, eschar, edema, and any other dermal critical signs were not observed from all the experimental rabbits in the dermal irritation test. In the acute eye irritation test, no clinical signs of cornea, iritis, conjunctiva (redness, edema, lacrima, and chemosis) were observed from all the experimental rabbits. Individual ocular irritation, mean ocular irritation, and acute ocular irritation were calculated as 0.0. The results of dermal and eye irritation studies on P. temperata indicated that this bacterium could be a safe and effective alternative bionematicide against the most serious plant-parasitic root-knot nematodes in the genus Meloidogyne.

• Archives of Plastic Surgery
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• 제49권4호
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• pp.473-478
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• 2022

Background We investigate the effect of involutional blepharoptosis (IB) surgery based on dry eye symptoms by analysis using objective and subjective measures. Methods We recorded various parameters from patients that underwent levator advancement surgery for IB, totaling 125 eyes (total 65 patients, 5 unilateral, 60 bilateral). Subjective assessment comprised a questionnaire on dry eye-related quality of life score (DEQS), a summary score calculated from DEQS, and six-grade evaluation, the patient's own measure of eye comfort. Objective assessment comprised marginal-reflex distance-1 (MRD-1), measurement of tear film breakup time, and superficial keratopathy (SPK) existence by slit lamp microscope. Results Subjective assessments showed that IB patients had improvement of dry eye symptoms and eye comfort when surgery increased MRD-1. On the other hand, objective assessments showed that the presence of SPK is suspected when the postoperative MRD-1 level is 3 mm or higher. Conclusion IB surgery must not only increase MRD-1 value, but also to perform maintenance of the appropriate ocular surface condition. From our parameters, we suggest postoperative MRD-1 value should be maintained at < 3 mm to safe and effective of IB surgery.

• 한국정보통신학회논문지
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• 제16권1호
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• pp.153-159
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• 2012

운전자의 시야는 차량 구조 등 물리적인 요소들로 인해 차량 주변 환경에 대한 사각지대가 존재한다. 사각지대에 존재하는 장애물은 차량 파손 및 인사 사고의 원인이 된다. 차량 주변의 사각지대 개선을 위해 최근 출시되는 차량에는 장애물 감지 센서, 후방 카메라 등 운전자의 시각에서 벗어난 곳의 장애물에 대한 정보를 제공하기 위한 장치들과 차량 주변 환경을 영상으로 제공하는 AVM(Around View Monitoring) 시스템 등 안전 운행을 위한 전장 장치들이 장착되고 있다. 운전자는 후진 주행이나 좁은 골목길 주행시 이러한 장치들에서 제공되는 차량 주변 환경에 대한 정보를 얻음으로써 안전 운행에 도움을 받고 있다. 본 논문에서는 운전자의 시야 개선을 위해 차량의 전, 후, 좌, 우에 4대의 카메라를 부착하여 차량 주변을 한 눈에 볼 수 있는 통합된 Bird's Eye View를 제공하는 4SM 시스템을 설계하고 구현한다. 본 논문에서 제안하는 4SM 시스템은 전, 후, 좌, 우 4대의 카메라로부터 입력된 영상을 통합된 하나의 영상으로 제공함으로써 운전자가 한 눈에 차량 주변 상황을 인식할 수 있도록 한다.

• Journal of Applied Biological Chemistry
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• 제60권3호
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• pp.245-248
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• 2017

Saline groundwater was obtained from a 100-m deep basalt layer into which seawater had infiltrated. This groundwater is known to contain various minerals. Like deep seawater, saline groundwater is expected to have various applications due to the presence of biologically beneficial minerals. In Korea, saline groundwater is mainly obtained from the coastal area of Jeju. Before applying saline groundwater to various products, however, its biological safety needs to be examined. In the present study, skin and eye irritation tests were performed to assess the safety of saline groundwater according to the guidelines of the Korea Food and Drug Administration. When compared to control, Jeju saline groundwater showed no level of eye and skin irritation. These results suggest that Jeju saline groundwater induces no irritation, and is therefore sufficiently safe to be applied to the eye and skin of people.

• 한국임상수의학회지
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• 제36권6호
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• pp.325-329
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• 2019

This study was designed to compare the effects of continuous release of an anti-glaucoma drug applied by an osmotic pump and by conventional eye drop instillation in normal beagle dogs, by measuring drug concentration in the blood and monitoring intra-ocular pressure (IOP). In group 1, an osmotic pump filled with Trusopt® was implanted subcutaneously over the right eye of each dog and the IOP was measured. In group 2, the right eye of each dog was administered with 2% dorzolamide (Trusopt®, Merck, USA) three times per day. Blood was sampled once per week in all groups. The IOP of the end of this study was 16.7 ± 0.58 mmHg in group 2 and 17.7 ± 2.52 mmHg in group 2. Dorzolamide concentration in blood increased continuously over 4 weeks up to 585.8 ± 79.42 ㎍/L in group 1, and 747.3 ± 27.89 ㎍/L in group 2. We achieved satisfactory results in the osmotic pump group, which had a similar effect on IOP, and low fluctuations in IOP. Therefore, the results of this study should allow osmotic pumps to be consider as an alternative method to eye drops for the effective, safe, and convenient treatment of glaucoma.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2003년도 추계학술대회 논문요약집
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• pp.133-133
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• 2003