Korea Institute of Ocean Science & Technology

Hee Jin Kang

Jin Hyuk Choi

Jang Pyo Hong

So Young Sung

Yunho Kim

Hyung Won Shim

Myung Ki Shin

Kwang Soo Kim

Dong-Kon Lee

Min Suk Ki

Yun Ho Kim

Youngshik Kim

Gyeong Joong Lee

Geun Tae Yim

Beom Jin Park

Young Shik Kim

Hae Seong Ahn

Myung Soo Shin

Myoung Soo Kim

Dong Kon Lee

Provided, according to one embodiment, is a method for determining a current of an electric motor or a generator, the method comprising the steps of: acquiring characteristics of a filter for eliminating noise occurring in a process for determining a current of an electric motor or a generator; determining a time delay caused by the filter, on the basis of a change in a phase indicating the characteristics of the filter, the change resulting from a change in an operating frequency of the electric motor or the generator; and determining the current of the electric motor or the generator by compensating the time delay.

Method and device for determining current of electric motor or generator

An upright tank-based propulsion assistance rotor sail system is proposed. The system may include an upright tank fixed to a hull of a ship, and a rotor sail in a form of a cylindrical shape having a length and diameter greater than or equal to the upright tank, and installed to surround part or all of an outer circumferential surface of the upright tank. The rotor sail may be rotatably installed while surrounding the upright tank concentrically with the upright tank, and may be movable along a height direction of the outer circumferential surface of the upright tank to maintain a predetermined height. In addition, a vessel equipped with the upright tank-based propulsion assistance rotor sail system is proposed. The fuel tank may be installed to stand upright on the vessel so that the rotor sail is installed to be movable in the vertical direction.

Upright tank-based propulsion assistance rotor sail system and vessel equipped with same

A magnetic levitation rotor sail is proposed. The rotor sail may include a coil unit provided at a lower portion of a body of the rotor sail, and an electromagnet configured to levitate the coil unit. The rotor sail may also include a support member supporting the electromagnet, and a gap sensor provided at the support member and configured to measure a gap between the coil unit and the electromagnet.

Magnetic levitation rotor sail

Provided are a marine testbed and a marine test method for providing marine verification and securing a track record of an eco-friendly propulsion system for a ship, wherein the marine testbed and the marine test method test and evaluate applicability of a hybrid propulsion system to the ship and facilitate securing of a track record, the hybrid propulsion system utilizing a battery, a fuel cell, a zero-carbon fuel engine, a zero-carbon fuel mixed-combustion engine, and a heterogeneous eco-friendly alternative fuel for the ship which are essential for developing an eco-friendly ship.

Marine testbed and marine test method for providing marine verification and securing track record of eco-friendly propulsion system for ship

A ballast water-free ship using a difference in the depth of the bottom shell plate between the bow/stern and the midship section and a construction method thereof. A stepped portion is formed between either the bow or the stern and the midship section, such that the depth of the bottom shell plate of either the bow or the stern differs from the depth of the bottom shell plate of the cargo containment in the midship section, so that cargo can be loaded and unloaded without ballast water operation.

Ballast water-free vessel using difference in depth of bottom shell plate between bow/stern and midship section and construction method thereof

The present disclosure relates to a natural gas hydrate tank container loading system for transporting natural gas hydrate, and the present disclosure provides a natural gas hydrate tank container loading system, enabling self-powered power generation and boil-off (BOG) gas treatment, includes: a refrigerator for inhibiting the generation of boil-off gas which naturally generates in a natural gas hydrate tank container during transportation; and a solar cell, a battery, and a generator, which operates by means of the boil-off gas, for supplying electric power to the refrigerator, thereby ensuring a generation capacity sufficient to operate the refrigerator by means of the solar cell, the generator, and the battery, and thus always maintaining a stable phase equilibrium (self-preservation) in the natural gas hydrate tank container even during long-distance transportation and solving problems of fire, environmental pollution, or the like which occur when the boil-off gas (BOG) is discharged to the outside.

Natural gas hydrate tank container loading system enabling self-powered power generation and boil-off gas treatment

The present invention relates to a natural gas hydrate tank container loading system for transporting natural gas hydrate, and the present invention provides a natural gas hydrate tank container loading system which enables automated connection of an electric power line and a boil-off pipe, and may automatically connect an electric power line and automatically connect the pipe by simultaneously stacking respective natural gas hydrate tank containers, in order to solve problems of a transportation method using the existing natural gas hydrate tank containers in the related art in that an operation of connecting an electric power line to a refrigerator for minimizing the occurrence of boil-off gas and maintaining a phase equilibrium condition in the tank containers and an operation of connecting the pipe for discharging the boil-off gas need to be manually and individually performed for long-distance transportation of a large amount of natural gas hydrate by using a ship, which causes an inconvenience.

Natural gas hydrate tank container loading system enabling automated connection of electric power line and boil-off gas pipe

By mooring or slowly moving the catamaran in a current through which a garage patch formed of disused plastic particles over than 90% is drifting, a heap of the marine debris flows into the bow of the catamaran and then is smashed. While the disused plastic particles that have been smashed at the bow of the catamaran is moving from the bow toward the stern by way of the tunnel between hulls of the catamaran, the plastic particles are first classified by differences of densities. These first classified plastic particles are collected and then transferred into a narrow and long inside of the catamaran, being finally classified by a triboelectrostatic action. Thereafter, these finally classified plastic particles are made to be pallets which are to be transported to a land facility for recycling or abandoning them.

Low energy consuming garbage patch gathering and classifying equipment and method using catamaran

Disclosed is a container for storing, transporting, and dissociating hydrate pellets, the container comprising: a first container () made up of a plurality of frames; a second container () which is rotatably installed inside the first container (), stores hydrate pellets therein, and has an internal surface to which a heat insulating member is attached; and a refrigerating machine () which is installed inside the first container () and refrigerates the second container (), wherein the second container () is equipped with a heating wire (), which is heated to dissociate the hydrate pellets by being supplied with power, or with a hot water tube (), through which hot water flows to dissociate the hydrate pellets, on the internal surface thereof.

Container for storing, transporting, and disassociating hydrate pellets and method for storing, transporting, and disassociating hydrate pellets by using same

Growing community of inventors

Gyeryong, South Korea

Hee Jin Kang