• Journal of fish pathology
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• v.18 no.2
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• pp.125-131
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• 2005

Amoebic gill disease of flounder, Paralichthys olivaceus was diagnosed at commerical culture facility in South Korea. The amoeba was identified as a species of the genus Neoparamoeba based on the morpholgical characteristics of trophozoites. Transmisson electron microscopy revealed the presence of a symbiotic organism, parasome in the cytoplasm and dense glycocalyx on the surface of the trophozoites. They lacked the boat-shaped microscales on the surface and contained numerous vacuoles and channels, mitochondria in the cytoplasm. Colonization of amoebae on gill tissue elicited extensive fusion and hyperplasia of gill lamella.

• Journal of Technologic Dentistry
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• v.31 no.3
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• pp.87-103
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• 2009

The objective of the research which it sees life style of the individual and is the stroke engineering military merit satisfaction to examine the relationship. That Adler talked, it classified life style with the socially useful type, the ruling type, the getting type and the avoiding type. This governing form of the socially useful type sees, the ruling type grew the getting type and the avoiding type compared to military merit satisfactory boat song. Like this results military merit satisfactory degree of stroke engineering school lifestyle professionalism as dental technician company route period operates with the VIP who is important for is the thing. The research of the program development for the course map and the military merit duty selection map of restricted point and stroke engineering school lifestyle of the research which it sees discussed is necessary. The results are as following. 1. the types of Life-style ; the ruling type 31.3%, the getting type & the avoiding type 27.4%, the negative social type 26.6%, the socially useful type 14.8%. 2. the Major satisfaction ; the socially useful type 3.59, the ruling type 3.55, the negative social type 3.51, the getting type and the avoiding type 3.35. 3. the Campus life satisfaction ; the socially useful type 3.39, the ruling type 3.32, the negative social type 3.24, the getting type and the avoiding type 3.12.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.49 no.2
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• pp.116-125
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• 2013

Jigging and angling fishery is prevalent in the East Sea of Korea and this fishery needs many lamps to attract the fish. And the fishing boat uses 24~47 ballasts by the vessel's tonnage to turn on the fishing lamp. A 3.5kW magnetic-type ballast being currently used at many fishing boats can drive two 1.5kW metal-halide lamps. Meanwhile, this ballast has large weight (25kg) and volume. Therefore it is one of reason for the over-consumption of energy and the fire, resulted from overheat and electrical short, occurs occasionally because the ballast is installed at narrow and hot engine room. In addition, most of magnetic ballast has several problems such as periodic condenser replacement, low energy efficiency and making lamp short life, etc. So it is necessary to improve or develop newly the electronic ballast, which has to be smaller, lighter and more efficient. An electronic ballast was designed for the fishing boat by considering duration and electromagnetic interference in the study. Its weight and volume are respectably 40% and 66% compared to current ballast on the basis of PCB. The metal-halide lamp's spectrum of the designed ballast was nearly same to that of the current ballast in the test of lighting. In particular, the light stability was improved and there isn't any radio interference. As mentioned above, it is expected that the developed electronic ballast can replace current magnetic ballast because of many advantages related to energy-saving.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.77-81
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• 2010

This study carried out hydraulic model test for water circulation system in Cheongna district as part of Incheon Free Economic Zone. Canal way project of Cheongna was planned to establish for environment-friendly water circulation system, improve quality of life and diversification of traffic through using boat as a water-friendly international business city. The navigation canal, There are two intake facility in central park and it can purify water 15,000$m^3$ per day. After purify, water move to 8 facility of water culture area which supplies water in canal way. This process called water circulation system in cheongna. Also, there are several flow induction machine in canal way except south-north way. Therefore, this study will verify about validity of water circulation system's safety through hydraulic model test.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.6
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• pp.633-640
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• 2014

This paper is what accident in sea have been produced as lost themselves life and property about 600~700times at every years. It was analyzed that the collision accident is highest rank by 37% among the marine accidents and the fishing vessel is highest by 58% in these collision accidents and also the small fishing boat under 20tons is highest by 27% on them. Over the half of thecollision accidents by 56% they couldn't find each other to just before the collision situation. Therefore this was induced to experiment on a national basis that the role of communication of ship is to move from lose themselves life and property.

• Transactions of the Korean Society of Pressure Vessels and Piping
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• v.9 no.1
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• pp.56-61
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• 2013

This paper presents the results of integrity assessment for the cracks happened in reactor vessel upper head penetration nozzles. The crack morphology for a boat sample from crack area was analyzed through microscope. The stress condition including weld residual stress around crack was analyzed using finite element analysis. From the results of crack morphology and stress condition, the crack was concluded as primary water stress corrosion cracking. The integrity of the cracked nozzle was assessed by the methodology provided in ASME Section XI. According to the assessment results, the remaining life of the cracked nozzle was 1.43 yrs. and the plant decided to repair it.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.46 no.3
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• pp.269-276
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• 2018

This paper describes commander Cho's achievements, who is not only a founder of naval aviation, but also a pioneer of domestic aviation. He developed a number of seaplanes with components taken from US military aircrafts abandoned during Korean war. He eventually established the naval aviation unit with aircraft developed under his leadership, and devoted his life for coast guard as a first commander. Proudly, ROK navy operated the naval aviation unit based on its own developed aircraft. It was a glorious achievement of ROK navy and a beginning milestone of korean aviation history.

• International Journal of Ocean System Engineering
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• v.3 no.2
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• pp.61-67
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• 2013

In this study, wave spectrum based fatigue analyses are studied for Turkey's adjacent coastal seas by using Maestro finite element analyzing software. Palmgren-Miner's method is used to obtain the fatigue safe life time. Palmgren-Miner's method was selected for the fatigue analyses because of its good acceptance of data from almost all classification societies such as Germanischer Lloyd, the American Bureau of Shipping, Det Norske Veritas, etc. The maximum stress regions of the structures are obtained by using finite element analyses, and the results are compared with the endurance limit of the W$\ddot{o}$hler diagram of AA5059 H321 aluminum alloy. The wave characteristics table given in this article is used to obtain the number of cycles for each sea condition. By using the wave characteristics table, the wave lengths, wave speeds, and cycles are obtained. This study is performed to estimate the lifetimes of a semi-swath type coast guard boat and/or commercial yacht projects, which are produced by using AA5059 H321 aluminum alloy, under different sea environment conditions. Fatigue examinations are performed for both head seas and oblique seas.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2010.04a
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• pp.163-164
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• 2010

In this paper, the plan to invigorate regional marine tourism is discussed. The southwest area of Jeonnam province is famous for its beautiful islands and seashore line which has richness and variety of marine life. A solution of tourists increment by leisure sports utilizing islands and coastline will be proposed MTB tournament held at islands that has historic backgrounds and scenic beauty and its effect on influx of tourist were tracked first. Next application of mud flats boot around seaside and connection with experience program of seaside village were also examined. These activities will contribute to development of marine tourism and increase of income for regional people.

• Korean Journal of Crystallography
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• v.11 no.1
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• pp.22-27
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• 2000

The structure of cis-(malonato)[(4R,5R)-4,5-bis(aminomethyl)-2-isopropyl-1,3-dioxolane]platinum(II) with a potent anticancer activity has been determined by the X-ray crystallographic method. Crystal data are as follows: Pt(C/sub 11/H/sub 20/N₂O/sub 6/), M/sub 4/=471.38, monoclinic, P2₁, a=7.112(1), b=33.615(3), c=7.135(1)Å, β=116.80(1)°, V=1522.6(3)Å, and Z=4. The two independent molecules with very similar structures are approximately related by pseudo two-fold screw axis symmetry, which makes the monolinic cell look like the orthorhombic cell with one molecule in the asymmetric unit and space group C222₁. The crystal packing mode is similar to that of the analogue with the dimethyl substituents instead of the isopropyl group. The Pt atom is coordinate to two O and two N atoms in a square planar structure. The six-membered chelate ring in the leaving ligand assumes a conformation intermediate between the half chair and the boat forms. The seven-membered ring in the carrier ligand assumes a twist-chair conformation and the oxolane ring assumes an envelope conformation. Crystal packing consists of the extensive hydrogen-bonding network in the two-dimensional molecular layers and weak van der Waals interactions between these layers.