• Proceedings of the Korean Society of Fisheries Technology Conference
• /
• 1994.06c
• /
• pp.26-30
• /
• 1994

• 한국가시화정보학회:학술대회논문집
• /
• 2007.11a
• /
• pp.55-58
• /
• 2007

To improve the conventional optical chromatography, the continuous particle separator, the cross-type optical chromatography, is fabricated using micro-channel and fiber optics. A laser beam irradiates into the liquid solution containing particles in the perpendicular to the liquid flow direction. The different sized polystyrene latex micro-spheres, $2.0\;{\mu}m\;{\pm}\;0.02\;{\mu}m$, $5.0\;{\mu}m\;{\pm}\;0.05\;{\mu}m$, and $10.0\;{\mu}m\;{\pm}\;0.09\;{\mu}m$ diameter, are separated in cross-type optical chromatography. The separated particles are delivered to down stream in the micro-channel maintaining the retention distance continuously. The measured retention distances for different sized particles well agree with theoretical predictions.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2019.11a
• /
• pp.98-100
• /
• 2019

해상에서 선박 등에게 광력을 제공하기 위한 등명기의 전기 에너지 생산이 태양광과 풍력 발전에 의하여 이루어 질 수 있도록 하는 신재생에너지 융합 발전 기능을 구비하였으며, 실시간으로 상태 모니터링이 가능하도록 원격단말장치를 내장한 9해리용 일체형 LED 등명기 기술 개발에 관한 것이다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2010.04a
• /
• pp.448-452
• /
• 2010

The traditional Aids to Navigations(AtoN) have been ensuring the safety of ships by indicating the passage and dangers by depending on the flashing lights. But the more the industrial complex behind port which is all over the country involving the Ulsan port developed, the more the lights behind port is stronger, and then the distinguishment of the signal of AtoN from the lights behind port is more difficult. And It is urgently needed to prepare the counterplan about the ensurement of safety because the authorities levels up the limit tonnage of the ships which are sail in and out during night to improve the operation of port through reducing of the traffic jam So, the method of direct lighting like LED non-neon is applied to unmanned lighthouses or light beacon, and the LED flashing number plate is applied to light buoys whose light power is weaker than to improve distinguishment and to be easy positioning of ships. As a result, the users of Ulsan port comment favorably on this item and the development of AtoN must be continuos to overcome the lights behind port.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2017.11a
• /
• pp.218-219
• /
• 2017

등부표는 태양광발전을 이용한 독립형 전력계통시스템으로 일사량과 표면온도에 의한 태양광 발전효율 저하에 따른 등명기 소등 또는 광력 미약으로 항로표지에 대한 신뢰성 확보에 대한 문제점이 발생하고 있다, 국내 충방전조절기는 표준규격서에 따라 개발되고 있으나 충전제어방식은 대부분 PWM 제어 방식을 적용하여 개발되고 있어 충방전조저릭의 전력 효율 향상 등의 성능 개선을 추진할 필요가 있다. 본 연구에서는 충방전조절기의 성능 개선을 위하여 충전효율을 향상시키고 자체소비전력을 저감하는 기술을 개발하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2014.10a
• /
• pp.349-351
• /
• 2014

500W급 LED 등명기는 고광력이 요구되므로 주로 고출력 LED 광원을 적용하고 있으며, 고출력 LED 광원의 안정적인 구동을 위하여 LED 광원을 제어하고 모니터링 할 수 있는 드라이버 회로개발이 필요하다. 또한 LED 등명기의 등질을 제어하기 위한 모터 제어기술이 동반되어 개발 되어야 한다. 이에 고출력 LED 광원을 안정적으로 구동할 수 있는 LED 드라이버를 설계하고 이를 모듈화하여 효율적인 제어가 가능한 LED 드라이버 모듈을 개발하였으며 LED 드라이버 모듈 및 모터를 제어하고 모니터링 할 수 있는 제어회로를 개발하였다.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
• /
• 2018.11a
• /
• pp.139-140
• /
• 2018

등부표는 태양광발전을 이용한 독립형 전력계통시스템으로 일사량과 표면온도에 의한 태양광 발전효율 저하에 따른 등명기 소등 또는 광력 미약으로 항로표지에 대한 신뢰성 확보에 대한 문제점이 발생하고 있다. 일부 항로표지용 고효율 충방전조절기 제품이 개발되고 있으나 "항로표지 장비 용품 표준화 규정"의 항로표지용 충방전조절기 표준규격(제3조3호)이 제정고시 되어 충방전조절기의 기능 및 성능개선을 추진할 필요가 있다. 본 연구에서는 개정된 충방전조절기의 표준규격의 성능을 만족하고 상용화가 가능한 구조기술을 개발하였다.

• Proceedings of the KSME Conference
• /
• 2008.11b
• /
• pp.2406-2409
• /
• 2008

The concept of optical mobility in the optical particle separation was derived. To verify the concept of the optical mobility, three particles were chosen to test the effects of optical mobility, namely, PSL, PMMA and silica particles. Three different experiments were performed. Firstly, retention distances of the different sized particles were measured and predicted. Secondly, retention distances of particles, having same size but different refractive indices, were measured and predicted. Finally, retention distances of the particles, which had the same optical mobility but very different sized and refractive indices, were measured and predicted.

• Journal of the Korean Society of Visualization
• /
• v.12 no.2
• /
• pp.13-17
• /
• 2014

In the present study, the optofluidic droplet manipulation in a microfluidic platform was demonstrated via theoretical and experimental approaches. Optical scattering force and gradient force were used to separate and trap droplets. Two types of droplets were generated by a T-junction method in the microfluidic channel. While they approach a test region where the optical beam illuminates the droplets, they were pushed by the optical scattering beam. The displacement by the laser beam is dependent on the refractive index of the droplets. By using the optical gradient force, the droplets can be trapped and coalesced. In order to bring the droplets in a direct contact, the optical gradient force was used to trap the droplets. A theoretical modeling of the coalescence was derived by combining the optical force and drag force on the droplet.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.37 no.2
• /
• pp.117-123
• /
• 2001

Anchovy scoop nets, a kind of lift net have been used in the coastal area of Cheju and South sea of Korea. An incandescent lamp(AC 100V, 1kW) is being used as a fishing lamp for gathering anchovy. Fishing lamp was installed at 1m ahead of the prow and 1.5m higher than the water surface. The fishing lamp let fish school rise to the water surface and attract to bag net. Accordingly, a successful anchovy catching depends on controling of fishing lamp. On the study, the distribution of spectral irradiance illumination of incandescent lamp(1kw) and the irradiance efficiency of reflection plate were analyzed and discussed to investigate the ability of fishing lamp which can attract anchovy school effectively. The results obtained are summarized as follows : 1. Around 180% of irradiance efficiency of incandescent lamp was increased by using the reflection plate. The light of lamp was radiated into water with circular shape. 2. The irradiance illumination of incandescent lamp in air was a maximum in wave length of 994nm but it was 690nm at 0.5m and 1.0m of water depth. 3. The relationship between water depth(x) and water illumination(y) of vertical light is represented as follows : y=146.03e supper(-0.37x) 4. The light of incandescent lamp(1kW) pass through much better into vertical direction than horizontal but it was estimated that the light was not able to reach depth of 20m.