Method of providing optimal operating speed to satisfy carbon intensity indicator rating of vessel

Abstract

One embodiment may provide a method of providing an optimal operating speed to satisfy a carbon intensity indicator (CII) rating of a vessel including acquiring operating data for the vessel, wherein the operating data includes data on an operating speed, an operating distance, and a draft of the vessel, obtaining a CII value from the operating data, acquiring a target CII value, comparing the CII value with the target CII value, wherein the comparing includes obtaining a difference between the CII value and the target CII value, obtaining another operating speed that minimizes the difference, and outputting the another operating speed as an optimal operating speed for a CII rating for the vessel to satisfy.

Description

Field of the invention

[0001] Embodiments of the present disclosure relate to a technology for providing an optimal operating speed to satisfy a carbon intensity indicator (CII) rating of a vessel.Background of the invention

[0002] Maritime transport accounts for approximately 90% of global trade and is known as a relatively efficient means of transport, but it generates a significant amount of carbon emissions due to its scale. The carbon emissions of vessels are mainly determined by fuel consumption, and vary depending on the type of fuel used, engine efficiency, operating speed, and route conditions. In particular, traditional marine fuels such as heavy fuel oil (HFO) have high carbon emission factors and have a significant environmental impact. Against this backdrop, reducing carbon emissions has become a major challenge for the shipping industry.

[0003] The International Maritime Organization (IMO) introduced the carbon intensity indicator (CII) system to support the decarbonization of the shipping industry. The CII measures the carbon intensity of a vessel (carbon emissions per transport operation) to evaluate the energy efficiency of the vessel. This is calculated based on the annual operating data of the vessel, and the results are classified into ratings from A to E. The CII rating directly affects charter contracts, carrier reliability, and compliance with environmental regulations. In particular, vessels that have received a D or E rating must submit an improvement plan, and if they do not improve, they may be subject to operation restrictions or commercial disadvantages. In order to improve the carbon emissions and CII rating of a vessel, it is necessary to develop an innovative and efficient operation technology that departs from the existing operation method.

[0004] Accordingly, the inventor of the present disclosure has completed the present disclosure after a long period of research and trial and error on a technology for providing an optimal operating speed to satisfy a CII rating of a vessel.Summary of the invention

[0005] Against this background, one object of embodiments of the present disclosure is to provide a technology for obtaining an optimal operating speed that minimizes the difference between a CII value obtained from operating data and a target CII value.

[0006] In addition, other unspecified objects of the present disclosure will be additionally considered within a range that may be easily inferred from the detailed description below and its effects.

[0007] In order to achieve the above described objects, an embodiment may provide a method of providing an optimal operating speed to satisfy a carbon intensity indicator (CII) rating of a vessel, the method including: acquiring operating data for the vessel, wherein the operating data includes data on an operating speed, an operating distance, and a draft of the vessel; obtaining a CII value from the operating data; acquiring a target CII value; comparing the CII value with the target CII value, wherein the comparing includes obtaining a difference between the CII value and the target CII value; obtaining another operating speed that minimizes the difference; and outputting the another operating speed as an optimal operating speed for a CII rating for the vessel to satisfy.

[0008] The method may include: determining whether the another operating speed satisfies constraint conditions reflecting characteristics and operating environment of the vessel; and if the another operating speed satisfies the constraint conditions, determining the other operating speed as the optimal operating speed.

[0009] In the method, the obtaining of the another operating speed that minimizes the difference may include: updating an operating speed value to generate an updated operating speed value; obtaining a CII value from the updated operating speed value; and repeatedly generating the updated operating speed value and obtaining the CII value until a difference between the CII value obtained from the updated operating speed value and the target CII value becomes minimal.

[0010] In the method, the obtaining of the another operating speed that minimizes the difference may include updating an operating speed value to generate a plurality of updated operating speed values; obtaining a plurality of CII values from the plurality of updated operating speed values; selecting a CII value, among the plurality of CII values, having a minimum difference from the target CII value; and determining an updated operating speed value for the selected CII value as the optimal operating speed.

[0011] The method may include acquiring previous operating data for voyages previously completed by the vessel, and the obtaining of the CII value may include reflecting a CII value obtained from the previous operating data in order to obtain the CII value.

[0012] The method may include acquiring current operating data for a voyage currently being operated by the vessel, and the obtaining of the CII value may include reflecting a CII value obtained from the current operating data in order to obtain the CII value.

[0013] In the method, the operating data may include data on an operating duration of the vessel, and the obtaining of the another operating speed that minimizes the difference may include obtaining the operating duration which is a period during which the vessel has to operate at the other operating speed in order to minimize the difference together with the another operating speed.

[0014] Another embodiment may provide an apparatus for providing an optimal operating speed to satisfy a CII rating of a vessel, the apparatus including: an operating data acquiring unit configured to acquire operating data for the vessel, wherein the operating data includes data on an operating speed, an operating distance, and a draft of the vessel; a CII obtaining unit configured to obtain a CII value from the operating data; a target CII acquiring unit configured to acquire a target CII value; an operating speed optimizing unit configured to compare the CII value with the target CII value to obtain a difference between the CII value and the target CII value, and obtain another operating speed that minimizes the difference; and an output unit configured to output the another operating speed as an optimal operating speed for a CII rating for the vessel to satisfy.

[0015] As described above, according to the embodiments, it is possible to provide optimal operating conditions (operating speed and / or operating duration, etc.) that satisfy the CII rating of a vessel in a specific situation.

[0016] Further, according to the embodiments, it is possible to provide efficient operation by reducing the carbon emissions of the vessel and satisfying the CII rating while enabling rapid and safe operation.

[0017] In addition, it is additionally mentioned that even if an effect is not explicitly mentioned herein, the effect described in the following specification and the temporary effect thereof expected by the technical features of the present disclosure are treated as described in the specification of the present disclosure.Description of the drawings

[0018] FIG. 1 is a schematic diagram of an apparatus for providing an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment. FIG. 2 is a flow chart of a method of providing an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment. FIG. 3 is a flowchart illustrating an example of obtaining an optimal operating speed according to an embodiment. FIG. 4 is a flowchart illustrating another example of obtaining an optimal operating speed according to an embodiment. FIG. 5 is an example diagram of an interface for providing a user with an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment.

[0019] It is to be understood that the attached drawings are provided for reference only to help understand the technical idea of the present disclosure, and the scope of the rights of the present disclosure is not limited thereby.Detailed description of the invention

[0020] In describing the present disclosure, if it is determined that related known functions may unnecessarily obscure the gist of the present disclosure as they are obvious to those skilled in the art, detailed descriptions thereof will be omitted.

[0021] The terms used in the present application are used merely to describe particular embodiments and are not intended to limit the present disclosure. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, it should be understood that terms such as "comprise", "include", or "have" are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and they do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0022] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings, and in describing with reference to the accompanying drawings, identical or corresponding components will be assigned the same drawing numbers and overlapping descriptions thereof will be omitted.

[0023] FIG. 1 is a schematic diagram of an apparatus for providing an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment, and FIG. 2 is a flow chart of a method of providing an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment.

[0024] Referring to FIG. 1, an apparatus 100 (hereinafter referred to as the "apparatus") for providing an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment may include an input unit 110, an operating data acquiring unit 120, a CII obtaining unit 130, a target CII acquiring unit 140, an operating speed optimizing unit 150, and an output unit 160. Referring to FIG. 2, a method of providing an optimal operating speed by the apparatus 100 according to an embodiment may be illustrated.

[0025] The input unit 110 may receive data or a command from a user. The data may include data on the operating speed, operating distance, and draft of the vessel, and may additionally include the operating duration.

[0026] The operating speed may represent the speed of the vessel and may be expressed in units of knots (kn). The operating speed of the vessel may include a port operating speed when anchored at a port or moving within a port, and a sea operating speed when leaving a port and moving to another port. Vessels move slowly in a port, so the port operating speed is lower than the sea operating speed. In addition, the operating distance indicates the distance the vessel moves and may be in units of nautical miles (nm). The operating distance of a vessel, like the operating speed, may include the port operating distance, which is the distance moved in the port, and the sea operating distance, which is the distance moved at sea. The port operating distance is much shorter than the sea operating distance. In addition, the draft indicates the depth of the lower part of the vessel submerged in water and may be in units of meters (m). The lower part of the vessel is submerged in water due to its weight, and when cargo is loaded, the weight increases and the lower part is submerged deeper. The draft, i.e., the depth of the lower part submerged in water, may be considered to indicate the weight of the vessel. When cargo is unloaded in a port, the draft decrease, and when cargo is loaded, the draft increases. In addition, the operating duration indicates the time the vessel operates during one voyage (one-way travel between the departure point and the destination) and may be in units of days.

[0027] The above-described operating speed, operating distance, draft, and operating duration are closely related to fuel consumption and carbon emissions. Fuel consumption determines carbon emissions, and carbon emissions may determine the CII value and CII rating. Therefore, ultimately, operating speed, operating distance, draft, and operating duration may determine the CII value and CII rating. If at least one of operating speed, operating distance, draft, and operating duration increases, fuel consumption increases accordingly. Higher fuel consumption increases carbon emissions. Higher carbon emissions increase the CII value, which lowers the CII rating. In line with the trend of reducing carbon emissions, if a vessel does not satisfy a certain CII rating, it may be disadvantaged in operating the vessel. Therefore, shipowners who own vessels or charterers must operate efficiently to satisfy the required CII rating. This efficient operation may mean adjusting operating speed, operating distance, draft, and operating duration while considering the operating environment (e.g., voyage, weather, chartering costs, etc.).

[0028] Further, the input unit 110 may receive a target CII value from the user. The target CII value may be understood as a CII value corresponding to a CII rating that the vessel must satisfy. The apparatus 100 may determine the operating speed to satisfy the target CII value.

[0029] In addition, the operating data acquiring unit 120 may acquire operating data for the vessel (step S201). The operating data includes data on the operating speed, operating distance, and draft of the vessel, and may further include data on the operating duration. The operating data acquiring unit 120 may directly acquire the operating data input by the user from the input unit 110, or may load the operating data from a database or a storage medium of the apparatus 100.

[0030] Then, the CII obtaining unit 130 may receive the operating data from the operating data acquiring unit 120 and obtain the CII value from the operating data (step S203). The CII value may be obtained as carbon emissions for operating performance, and the CII obtaining unit 130 may use this relationship to obtain the CII value. The operating performance is proportional to the cargo volume and the operating distance, and the carbon emissions may be proportional to the fuel consumption of the fuel used by the vessel and the carbon emission coefficient of the fuel. The CII obtaining unit 130 may obtain the CII value by applying the operating speed, operating distance, and draft of the operating data to the above relationship.

[0031] The target CII acquiring unit 140 may acquire the target CII value, which is the CII value corresponding to the CII rating that the vessel must satisfy (step S205). The target CII acquiring unit 140 may directly acquire the target CII value input by the user from the input unit 110, or may load the target CII value from the database or the storage medium of the apparatus 100.

[0032] In addition, the operating speed optimizing unit 150 may obtain the operating speed that satisfies the target CII value (step S209). Specifically, the operating speed optimizing unit 150 may compare the CII value and the target CII value and obtain the difference between the CII value and the target CII value. The operating speed optimizing unit 150 may obtain another operating speed that minimizes this difference. The method of obtaining the other operating speed that minimizes the difference will be described later.

[0033] Furthermore, the operating speed optimizing unit 150 may determine whether the optimal operating speed satisfies the constraint conditions (step S211). Here, the constraint conditions are conditions that the operating speed must necessarily satisfy, and may include the characteristics and the operating environment of the vessel. For example, the constraint conditions may include the minimum speed and the maximum speed that the operating speed may have. The speed that the vessel may achieve may vary depending on the type (vessel type) and rating of the vessel. In addition, in terms of the operating environment, the weather may be bad or a specific voyage may include an area where operation is difficult. In such cases, the vessel must operate somewhat slowly, and the range of the minimum speed and the maximum speed may be smaller than usual.

[0034] If the operating speed optimizing unit 150 determines that the optimal operating speed satisfies the constraint conditions, the operating speed optimizing unit 150 may transmit data on the optimal operating speed to the output unit 160. The output unit 160 may output the optimal operating speed to the user (YES of step S211 and step S213). If the operating speed optimizing unit 150 determines that the optimal operating speed does not satisfy the constraint conditions, the operating speed optimizing unit 150 may obtain the optimal operating speed again (NO of step S211 and step S213).

[0035] The CII obtaining unit 130 may reflect the operating duration in obtaining the CII value. The operating data acquiring unit 120 may acquire operating data including the operating duration. The operating data acquiring unit 120 may transmit the operating duration to the CII obtaining unit 130. The CII value may be expressed as a ratio of carbon emissions to the operating performance, and the operating duration of the voyage corresponding to the operating performance needs to be reflected here. The CII obtaining unit 130 may obtain the CII value for the entire operating duration that constitute the voyage by multiplying the CII value of one day by the operating duration.

[0036] When the operating duration is included, the operating speed optimizing unit 150 may obtain the optimal operating speed that minimizes the difference between the CII value and the target CII value, while obtaining the optimal operating duration at the same time. It may be understood that the difference between the CII value and the target CII value may be minimized only when the vessel operates at the optimal operating speed for the optimal operating duration. If the vessel operates at the optimal operating speed for the optimal operating duration, the CII value of the vessel will be the target CII value or slightly less than it. Therefore, the operating speed optimizing unit 150 may derive a data pair that minimizes the difference between the CII value and the target CII value by adjusting the variables of the operating speed and the operating duration.

[0037] FIG. 3 is a flowchart illustrating an example of obtaining an optimal operating speed according to an embodiment.

[0038] Referring to FIG. 3, an example of obtaining an optimal operating speed by an apparatus according to an embodiment may be illustrated. When the operating speed optimizing unit of the apparatus receives a CII value from the CII obtaining unit and receives a target CII value from the target CII acquiring unit, the difference between the CII value and the target CII value may be obtained (step S301). In addition, the operating speed optimizing unit may obtain an optimal operating speed (step S303). Here, the operating speed optimizing unit may perform the following operations in order to obtain the optimal operating speed that minimizes the difference between the CII value and the target CII value.

[0039] The operating speed optimizing unit may obtain an initial CII value, obtain the difference from the target CII value, and then update the initial operating speed value to generate an updated operating speed value (step S303-1). Here, the operating speed optimizing unit may update the operating speed among the operating speed, operating distance, and draft provided as operating data, and may fix the operating distance and draft to given values and not update them. Additionally, if the operating duration is included in the operating data, the operating speed optimizing unit may also update the operating duration.

[0040] The operating speed optimizing unit may transmit the updated operating speed value to the CII obtaining unit, so that the CII obtaining unit may obtain the CII value again. The CII obtaining unit may obtain the CII value again from the updated operating speed value (step S303-3). The operating speed optimizing unit may obtain the difference between the reobtained CII value and the target CII value, and determine whether the difference is minimal (step S303-5). If the difference is minimal, the updated operating speed value may be determined as the optimal operating speed and transmitted to the output unit (YES of step S303-5 and step S303-7). If the difference is not minimal, the operating speed optimizing unit may re-update the updated operating speed value and generate the re-updated operating speed value (NO of step S303-5 and step S303-1). The operating speed optimizing unit may obtain the difference from the target CII value using the re-updated operating speed value and determine whether it is the optimal operating speed. The operating speed optimizing unit may repeatedly perform a determination on whether the difference between the updated operating speed value and the target CII value is minimized by updating the operating speed value.

[0041] Here, in order to determine whether the difference is minimal, the operating speed optimizing unit may determine the optimal operating speed by sequentially comparing the difference by the previous operating speed value with the difference by the immediately updated operating speed value. For example, if the first operating speed value is updated to generate the second operating speed value, and if the second difference by the second operating speed value is smaller than the first difference by the first operating speed value, the operating speed optimizing unit may provisionally determine the second operating speed value as the optimal operating speed. If the second operating speed value is updated again to generate the third operating speed value, and if the third difference by the third operating speed value is smaller than the second difference by the second operating speed value, the operating speed optimizing unit may discard the second operating speed value and provisionally determine the second operating speed value as the optimal operating speed. The operating speed optimizing unit may repeatedly perform this process a certain number of times. The number of repetitions is preset in the operating speed optimizing unit and may be adjusted by the administrator.

[0042] FIG. 4 is a flowchart illustrating another example of obtaining an optimal operating speed according to an embodiment.

[0043] Referring to FIG. 4, another example of obtaining an optimal operating speed by an apparatus 100 according to an embodiment may be illustrated.

[0044] When the operating speed optimizing unit of the apparatus receives a CII value from the CII obtaining unit and receives a target CII value from the target CII acquiring unit, the difference between the CII value and the target CII value may be obtained (step S401). In addition, the operating speed optimizing unit may obtain an optimal operating speed (step S403). Here, the operating speed optimizing unit may perform the following operations in order to obtain the optimal operating speed that minimizes the difference between the CII value and the target CII value.

[0045] The operating speed optimizing unit may obtain an initial CII value, obtain the difference from the target CII value, and then update the initial operating speed value to generate a plurality of updated operating speed values (step S403-1). Here, the operating speed optimizing unit may update the operating speed among the operating speed, operating distance, and draft provided as operating data, and may fix the operating distance and draft to given values and not update them. Additionally, if the operating duration is included in the operating data, the operating speed optimizing unit may also update the operating duration.

[0046] The operating speed optimizing unit may transmit a plurality of updated operating speed values to the CII obtaining unit, so that the CII obtaining unit may obtain the CII values again. The CII obtaining unit may obtain a plurality of CII values again from the plurality of updated operating speed values (step S403-3).

[0047] The operating speed optimizing unit may obtain the difference between the reobtained plurality of CII values and the target CII value, and select one CII value that minimizes the difference among the plurality of CII values (step S403-5). The operating speed optimizing unit may determine the updated operating speed value that is the basis of the selected one CII value as the optimal operating speed (step S403-7).

[0048] Here, in order to determine whether the difference is minimal, the operating speed optimizing unit may generate a plurality of updated operating speed values when updating the initial operating speed value. A plurality of CII values may be obtained through the plurality of updated operating speed values, and the CII value and the updated operating speed value that minimize the difference may be determined among them. For example, the operating speed optimizing unit and the CII obtaining unit may update the first operating speed value to generate the second to tenth operating speed values. The operating speed optimizing unit may obtain the second to tenth CII values for the second to tenth operating speed values, and obtain the differences (nine differences) of the target CII value therefor. One of the second to tenth CII values having the smallest difference among them may be selected, and one of the second to tenth operating speed values corresponding to the CII value may be determined as the optimal operating speed. The number of updated operating speed values to be derived by the operating speed optimizing unit is preset and may be adjusted by the manager.

[0049] FIG. 5 is an example diagram of an interface for providing a user with an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment.

[0050] Referring to FIG. 5, an example of an interface for providing a user with an optimal operating speed to satisfy a CII rating of a vessel according to an embodiment may be illustrated.

[0051] The apparatus may acquire the operating speed, operating distance, draft, and operating duration of the operating data to obtain the CII value, and update and generate the operating speed and / or operating duration that narrow the difference between the obtained CII value and the target CII value. Here, the apparatus may acquire the initial operating speed, operating distance, draft and operating duration to be updated. The initial operating speed, operating distance, draft and operating duration may be the initial operating data. Another updated operating speed and / or operating duration may be generated from the operating speed and / or operating duration of the initial operating data. The initial operating data may be operating data for a currently operating voyage.

[0052] For example, the user may input the current operating data of the currently operating voyage 2 as the initial operating data. The initial operating data may include [57.74, 9, 12471, 18.2] as [operating duration, operating speed, operating distance, draft]. The operating speed optimizing unit of the apparatus may obtain the CII value from [57.74, 9, 12471, 18.2], and provide the user with the operating speed and operating duration corresponding to [10.1, 51.45], which is close to the target CII value (the difference between the CII value and the target CII value is minimal). Although the current operating speed is 9 kn and the operating duration is 57.74 days, in order to satisfy the C rating of 2.004, operation at an operating speed of 10.1 kn for an operating duration of 51.45 days may be provided to the user (see dotted line indication).

[0053] This initial operating data may include operating data for voyages on which the vessel has previously completed operations. The previous operating data may be reflected in obtaining the CII value.

[0054] In the above example, the user may want to receive the optimal operating speed and optimal operating duration for the currently operating voyage 2 by reflecting the previous operating data of the completed voyage 1. The apparatus may obtain the CII value and CII rating using the previous operating data of the already completed voyage 1. Similarly, the user may input the current operating data of voyage 2. Then, the apparatus may reflect the CII value of voyage 1 in obtaining the CII value. The apparatus may provide the user with an optimal operating speed and operating duration that minimize the difference between the CII value and the target CII value of voyage 2 while reflecting the CII value of voyage 1. Accordingly, in the above example, an operating speed of 10.1 kn and an operating duration of 51.45 days were provided to the user as optimal values, but in this example, slightly changed values may be provided since the previous operating data of voyage 1 is reflected.

[0055] The components or "units" or blocks or modules used in the present embodiment may be implemented as software such as tasks, classes, subroutines, processes, objects, execution threads, programs performed in a certain area of memory, or as hardware such as field programmable gate arrays (FPGAs) or application-specific integrated circuits (ASICs), and may also be formed by a combination of the software and hardware. The components or "units" may be included in a computer-readable storage medium, and some of them may be distributed to a plurality of computers. In addition, one or more of the components may be implemented using one or more computing devices or parts thereof. Such devices may include, for example, personal computers, server computers, handheld or laptop devices, multiprocessor systems, microcontroller-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, cellular telephones, personal digital assistants (PDAs), gaming devices, printers, devices including set-top boxes, media centers, or other devices, automotive embedded or attached computing devices, other mobile devices, distributed computing environments including any of the above systems or devices, and the like.

[0056] The disclosed embodiments may be implemented in the form of a non-transitory recording medium storing a computer-executable program and / or instructions. The instructions may be stored in the form of program codes, which, when executed by a processor, generate program modules to perform the operations of the disclosed embodiments. The recording medium may be implemented as a non-transitory computer-readable recording medium. The non-transitory computer-readable recording medium includes all kinds of recording media storing instructions that may be deciphered by a computer. For example, there may be read only memory (ROM), random access memory (RAM), magnetic tape, magnetic disk, flash memory, optical data storage, etc.

[0057] The terms "comprise", "include", "configure" or "have" described above, unless otherwise specifically stated, mean that the corresponding component may be included, and therefore should be interpreted as including other components rather than excluding other components. Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person skilled in the art to which the present disclosure pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning they have in the context of the relevant technology, and are not to be interpreted in an ideal or excessively formal sense unless explicitly defined herein.

[0058] The protection scope of the present disclosure is not limited to the description and expression of the embodiments explicitly described above. In addition, it is added once again that the protection scope of the present disclosure may not be limited due to obvious changes or substitutions in the art to which the present disclosure belongs.

Claims

1. A method of providing an optimal operating speed to satisfy a carbon intensity indicator (CII) rating of a vessel, the method <b>characterized by comprising: acquiring operating data for the vessel, wherein the operating data includes data on an operating speed, an operating distance, and a draft of the vessel; obtaining a CII value from the operating data; acquiring a target CII value; comparing the CII value with the target CII value, wherein the comparing comprises obtaining a difference between the CII value and the target CII value; obtaining another operating speed that minimizes the difference; and outputting the another operating speed as an optimal operating speed for a CII rating for the vessel to satisfy.

2. The method according to claim 1, <b>characterized by comprising: determining whether the another operating speed satisfies constraint conditions reflecting characteristics and operating environment of the vessel; and if the another operating speed satisfies the constraint conditions, determining the another operating speed as the optimal operating speed.

3. The method according to claim 1, characterized in that the obtaining of the another operating speed that minimizes the difference comprises: updating an operating speed value to generate an updated operating speed value; obtaining a CII value from the updated operating speed value; and repeatedly generating the updated operating speed value and obtaining the CII value until a difference between the CII value obtained from the updated operating speed value and the target CII value becomes minimal.

4. The method according to claim 1, characterized in that the obtaining of the another operating speed that minimizes the difference comprises: updating an operating speed value to generate a plurality of updated operating speed values; obtaining a plurality of CII values from the plurality of updated operating speed values; selecting a CII value, among the plurality of CII values, having a minimum difference from the target CII value; and determining an updated operating speed value for the selected CII value as the optimal operating speed.

5. The method according to claim 1, characterized by comprising: acquiring previous operating data for voyages previously completed by the vessel, wherein the obtaining of the CII value comprises reflecting a CII value obtained from the previous operating data in order to obtain the CII value.

6. The method according to claim 1, characterized by comprising: acquiring current operating data for a voyage currently being operated by the vessel, wherein the obtaining of the CII value comprises reflecting a CII value obtained from the current operating data in order to obtain the CII value.

7. The method according to claim 1, characterized in that the operating data includes data on an operating duration of the vessel, and the obtaining of the another operating speed that minimizes the difference comprises obtaining the operating duration which is a period during which the vessel has to operate at the other operating speed in order to minimize the difference together with the another operating speed.

8. An apparatus for providing an optimal operating speed to satisfy a CII rating of a vessel, the apparatus <b>characterized by comprising: an operating data acquiring unit configured to acquire operating data for the vessel, wherein the operating data includes data on an operating speed, an operating distance, and a draft of the vessel; a CII obtaining unit configured to obtain a CII value from the operating data; a target CII acquiring unit configured to acquire a target CII value; an operating speed optimizing unit configured to compare the CII value with the target CII value to obtain a difference between the CII value and the target CII value, and obtain another operating speed that minimizes the difference; and an output unit configured to output the another operating speed as an optimal operating speed for a CII rating for the vessel to satisfy.

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