• Journal of the Korean Institute of Intelligent Systems
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• v.20 no.4
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• pp.541-547
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• 2010

Marine accidents do not correspond with another accidents because of a serious loss of lives and property. The many marine accidents can be attributed to human error like as carelessness and decision faults, and hence there is a strong need for decision-support tools for marine navigation. Much of researchers have introduced the techniques about the tools, but they hardly consider environmental factors (water depth, the width of waterway, a fishing ground, a current, the number of surrounding marine accidents, marine obstacles, etc), which are very important to the decision making of officers. In a previous research, we proposed the conceptual model of environmental risk assessment of ship navigation using fuzzy. This paper describes the detailed design of the environmental factors based on the opinion of navigation experts, and shows the validity of the conceptual model through a prototype system.

• Aerospace Engineering and Technology
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• v.13 no.2
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• pp.142-149
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• 2014

After launch of Low Earth Orbit(LEO) satellite, Initial Activation Checkout(IAC) and Calibration and Validation(Cal & Val) procedure are performed prior to enter normal operation phase. During normal operation phase, most of the time is allocated for mission operation except following up measures to anomaly and orbit maintenance. Since mission operation capability is key indicator for success of LEO satellite program and consistent with promotion purpose of LEO satellite program, reliability should be ensured by conducting through test. In order to ensure reliability by examining the role of LEO satellite and ground station during ground test phase, realistic test scenario that is similar to actual operation conditions should be created, and test that aims to verify full mission cycle should be performed by transmitting created command and receiving image and telemetry data. This paper describes the test design and result. Consideration items for test design are described in detail and result of designed test items are summarized.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.1
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• pp.283-289
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• 2015

This study examines what information is that affects factors of purchase from product detail page of internet shopping malls. For this purpose, the first, the classification of Internet shopping malls and product information and purchasing factors were determined through previous studies, the second, by constructing a questionnaire based on this, verify the validity of each factor and, the finally, the biggest influence what information was performed to examine. What consumers really wants the information, what information to make purchases, the Internet shopping site will be to assist in the design. The results using the Internet shopping site that users reviews, site reliability, Information Architecture, reserve, 3D images and product images available, has been identified as factors affecting the use of reviews and product images available on the factors affecting the revealed. In the site design layout, color systems, text and many design factors are important, but will have to be designed to be purchased by providing sufficient information for the product.

• Journal of Korea Society of Industrial Information Systems
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• v.23 no.1
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• pp.43-52
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• 2018

This paper presents the performance of a Phase Shift Full Bridge (PSFB) converter with inductive load and a new current control scheme to improve dynamic response of output current with various inductive loads. Enhanced dynamic model is used which includes leakage inductance and inductive load. Effect of changing of inductive load was analyzed in detail. Proposed current control scheme is designed based on phase margin specifications. As a result, the proposed current control scheme helps to improve the dynamic response in comparison with the existing current control scheme. The performance of the designed controller is verified by a 500 A PSFB converter. The results will be utilized for high current applications with high inductive load such as superconducting devices.

• Journal of Korea Multimedia Society
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• v.10 no.4
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• pp.483-491
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• 2007

This paper proposes a Situation Simulation Framework for implementing computer game and describes the possibility of analyzing game with unfolding situation. In last few years game systems have been evolving from the performance of physical engine, network traffic in the on line game to the representation of rendering physical phenomena. In computer game, a situation hierarchy structure which allows the designer for simulating high-level specifications of game structure. Logically simulated environment is created by defining situations and events based on hierarchy structure of the situation. We classify events into explicit event is occurred by user and implicit event is occurred by system. Our study defines the existence of objects is the most prevalent factor applied to any event in game world. The advantages of this approach are able to allow for providing the conceptual design for simulation game and analyzing the situation in the game world. And this method allows us to decrease the complexity of system design and abstraction modeling for the simulation game. Specially, the introduction of the definition of events allows us to approach game design in a structural manner rather than by their classification. The proposed method was implemented in the "Shooting BaDuk" among games.

• Proceeding of KASS Symposium
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• 2008.05a
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• pp.49-52
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• 2008

Structural Wood is developed by purpose to make efficient use of wood resources. The biggest advantage of structural wood is stable as strength is high than wood product that is used by structure in existing. Order manufacture according to design details is available. It Is used to main structure elements to large spatial structure. Structure wood kind utilizes Glulam, prefabricated wood I-joists and laminated veneer lumber(LVL) and so on. Structural Design and construction of Open-air Stage Roof Structure is described in the presented paper. Architectural roof materials is used to PVF/PFLT membrane. Column and diagonal members is used to steel members(SS400), and Cantilever beam is used to Glulam assembled with different Grade laminations(10S-28B).

• Journal of Korean Tunnelling and Underground Space Association
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• v.5 no.3
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• pp.279-289
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• 2003

In karst formation area, the tunnel support system is an important factor for the tunnel safety during operation. It is also not easy to determine the tunnel supporting system in the design stage. Therefore, it is necessary to standardize the tunnel supporting system in uncertain ground condition. This paper presents the standardization of the tunnel supporting systems to be adopt in karst formation. For the tunnel planned in the project area, karst features and the expected scenarios in the tunnel area were developed based on the results of the geological and geotechnical assessment. In order to provide specific supporting system and construction details for a wide range of possible karst features, the generalized typical support systems are developed according to the classification of karst features. In addition, the initial support systems and construction sequence for each karst feature are also presented in this paper.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.47 no.12
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• pp.841-847
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• 2019

Time series data of 6-component loads were computed for a horizontal axis wind turbine rotor in yawed operating conditions with both rotating and non-rotating coordinate systems fixed at a center of a rotor hub. In this study, a well-known 20 kW class of the NREL Phase VI rotor was used for a model wind turbine, and this paper focuses on the yaw moments and over-turning moments for the operating wind speed range between 6 to 25 m/s. Unsteady blade element momentum theorem was adopted to get the aerodynamic loads acting on the wind turbine rotor. Computed 6-component loads using the developed UBEM code were compared with those using the NREL FAST program. From the computed results, both yaw and over-turning moments would be basic inputs to determine not only the specification of yawing mechanism but also the design condition of foundation.

• Journal of KIISE:Software and Applications
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• v.33 no.2
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• pp.186-200
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• 2006

Analysis model focuses only on functional requirements and postpones nonfunctional requirements and implementation specific issues until subsequent design activities are undertaken. Based on the analysis models, the design activities are performed by refining and clarifying the analysis models. Thus, the quality of analysis models has a vast impact on the design models. Therefore, much effort should be taken to build correct analysis model. In this paper, we propose a set of structural constraints that analysis models of typical object-oriented development methods should satisfy. Three kinds of constraints are proposed: class related constraints, relation related constraints, and usage related constraints. For each constraint, formal definition and description with OCL are provided. In addition, through a case study with two medium-sired industrial systems, we demonstrated that the proposed approach can help to identify and correct serious deficiencies in object-oriented analysis models.

• KIPS Transactions on Software and Data Engineering
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• v.5 no.7
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• pp.313-318
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• 2016

To utilize sensory data, it is necessary to design architecture for processing and handling data generated from sensors in an IoT environment. Especially in the IoT environment, a thing connects to the Internet and efficiently enables to communicate a device with diverse sensors. But Hadoop and Twister based on MapReduce are good at handling data in a batch processing. It has a limitation for processing stream data from a sensor in a motion. Traditional streaming data processing has been mainly applied a MoM based message queuing system. It has maintainability and scalability problems because a programmer should consider details related with complex messaging flow. In this paper architecture is designed to handle sensory data aggregated The designed software architecture is used to operate an application on the open source framework Storm. The application is conceptually used to transform streaming data which aggregated via sensor gateway by pipe-filter style.