• Composites Research
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• v.31 no.6
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• pp.340-346
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• 2018

This paper addresses the stress analysis and design of composite double lead spiral which is boarded in 20mm universal ammunition drum by finite element method. The spiral system is very important to transfer the ammunition in stable and reliable manners for aircraft. Some verifications are done to check the possibility of composite application in spiral system. The design variables, stacking sequence and fiber orientation angles, are investigated for reliable design for practical design. The Tsai-Wu failure theory is applied to see the safety of the spiral structure. The design result is suggested to manufacture the double lead spiral part.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.05a
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• pp.346-348
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• 2022

A monitoring system was constructed to identify the cause of occurrence based on data on the analysis of the ignition factors of fermentation heat generated from loading waste. Universal Middleware was used to provide a real-time run-time environment for the configuration and speed of scenarios for each type of fire early warning. It is necessary to dynamically recognize the loading height and pressure of the loading waste, the drying of wood, batteries, and plastic waste, which are representative compositional wastes, and the carbonization changes on the surface. Therefore, this IoT situation recognition platform for analyzing low-temperature-fired fire possibility data was dynamically configured and presented.

• Proceedings of the Korean Society of Computer Information Conference
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• 2021.07a
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• pp.493-494
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• 2021

항공 산업의 발전으로 개인의 해외여행의 부담이 낮아져 각국의 왕래가 많아지고 있으며 사람들이 느끼는 국가 간 거리감이 크게 축소되고 있다. 또한, 화물의 운송이 활발해지며 이와 함께 화물 항공 물류량이 크게 늘어가고 있다. 항공물류 절차 중 화물적재는 사람들이 작업하고 적재 실수로 인한 사고들이 발생하는 것을 알고 이를 개선하고자 본 연구를 선정하게 되었다. 본 연구를 통해 구현할 '항공기 자동 중량평형 알림 시스템'은 평형 상태일 때 항공기 화물실 각 위치의 무게를 측정하고 적정 평형 값을 계산해 스크린에 출력하고 적정 평형 한계를 초과할 경우 경고음과 스크린을 통해 적정 평형이 아님을 알리는 방식으로 작동된다. 이러한 방식을 통해 조종사와 운항관리사, Load Master들이 잘못된 적재로 인한 화물의 위치를 수정하여 화물적재 과정의 안전핀 역할을 할 수 있다. 따라서 우리는 과제 개발에 따른 기대효과 로 항공사에서 여객기, 대형 수송기 등에 시스템을 추가하여 평형으로 인한 사고를 미연에 방지할 수 있다.

• Journal of the Korean Institute of Intelligent Systems
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• v.14 no.6
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• pp.687-692
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• 2004

In this paper, we proposed an efficient cache hoarding method in mobile computing environments using collaborative filtering. This method is used for solving the difficult problem of mobile computing, which is the vacuum of information service depending on low bandwidth, long delay, and frequent network disconnection. Many previous researches have been studied a cache hoarding approach for solving these problems of mobile client. But, the research of history information of mobile client did not support all informative requests for mobile clients. In our research, collaborative filtering model using history information and location data of mobile client is proposed. This proposed model supports an efficient service of necessary items for client's requirement. For the performance evaluation of proposed model, we make an experiment of simulation data using SAS enterprise miner. According to objective evaluation using cache hit ratio, we show that our model has a good result.

• Fire Science and Engineering
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• v.30 no.3
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• pp.23-30
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• 2016

A fire extinguishing system for a rack warehouse was recently designed, which only consider the gross area and number of stories. However, the design of such a system should take into account not only the planar structuree, but also the elevation perspectives due to its vertical structure. Moreover, the fire load of the commodities palletized on the racks should be considered, in order to design a performance-based fire safety system that is appropriate for these environmental conditions. For this reason, this study analyzed the fire characteristics of the commodities palletized on the racks (pallet + the commodities in a box unit + vinyl packing material), taking into consideration the results of a field investigation conducted in Korea, as well as the Hazard Classifications of Commodities used in other countries. Through this analysis, the heat release rate (HRR) and smoke production rate (SPR) were derived.

• KIISE Transactions on Computing Practices
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• v.21 no.11
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• pp.689-698
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• 2015

Currently, the itemized box loading operation at the Agriculture Products Processing Center which distributes agricultural products for the region is carried out manually. The process of loading agricultural products requires great manpower and had been resolved through the part-time employment of the residents of farm villages. However, recently it has become quite difficult to secure manpower as the aging within the rural community has been intensified. Hence, the necessity for countermeasures such as facility automation or use of robots have become necessary. This study suggests an automatic robot system for the itemized loading of apple boxes at the Agriculture Products Processing Center. The suggested method is to design and develop equipment such as a conveyer, robot, and bar code reader. In addition, a sorting plan, operational control, generation of control information, and software module that could monitor the inside of the Agriculture Products Processing Center is needed. After test-operating and evaluating the developed system, the existing manual work would be replaced with the automated robot system in order to enhance work efficiency and resolve safety issues.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.6
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• pp.74-87
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• 2020

Overloaded trucks are the main source that threatens road safety and directly affects the reduction of pavement life. The On-board truck scale is the only equipment that could prevent overloading by measuring and adjusting the loading weight before driving. Legislation is needed to encourage its installation so that the driver can prevent overloading. In this study, an on-board truck scale system was installed on 30 dump trucks for transporting construction waste, such as soil and aggregates, which are major loads of 36.55% for overloading, and the trucks were monitored remotely. The overload prevention effect was analyzed by comparing driving data for 1 month before distribution of the weight display app that can recognize the weight to the driver and 1 month after distribution. After installation, overloading could be 6.1% reduced, and the transportation efficiency could be increased by checking the weight provided from the On-board truck scale system.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2016.05a
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• pp.204-206
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• 2016

대한민국은 우수한 기술력을 바탕으로 한 각종 플랜트 산업이 주력업종인 강국이다. 이러한 특성에 맞게 각 산업단지에서는 고중량 대형화물에 대한 운송수요가 꾸준히 발생하고 있는 추세이다. 대형화물의 운송량이 증가할수록 고정결박 불량에 의한 화물 낙하, 이탈로 인한 차량파손, 도로파손 등의 사고가 지속적으로 발생하고 있으며, 이러한 사고의 발생 가능성은 항상 내재하고 있다. 하지만 현행 도로교통법에는 화물적재 및 고정에 대한 구체적 규정이 전무하여 화물운전자가 책임을 부담하고 있는 실정이다. 본 연구에서는 기존 화물적재 규정을 살펴보고 적합한 고정결박 지침을 제정하고 관리하는 절차의 지정을 제안하였다.

• Journal of the Korean Operations Research and Management Science Society
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• v.32 no.2
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• pp.1-15
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• 2007

This paper proposes a method for determining the number of storage rooms and designing the storage layout in warehouses for pyramid type stacks whose example are slacks for steel coils, paper rolls, and drums for oils. Formulas are derived for estimating the expected values and the variances of various handling times by cranes. From the derived formulas, the expected queuing time of road trucks is estimated. Base on the derived formulas, this study derives the cost function for determining the optimal numbers of rows, bays, and tiers of stacks and sizing cranes under the condition that the requirement for storage space is satisfied. Results of numerical analysis are provided.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.20 no.4
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• pp.458-463
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• 2011

A CHS(Container Handling System) is a system to load and to unload ISO 2000 or ISO 4000 standard containers which is widely used for various industrial transport purpose. A new light type of CHS is introduced in this paper, in order to reduce weight of cargos and to give the convenience in cargo loading and unloading without additional lifting equipments. The structural models of this system are created to assemble the smooth integration of system and to interface the each composing units with the specification of truck chassis to be mounted. These models are applied to find the suitable design parameters under the condition of force restrictions of each units. Finally, the stability of this system are investigated by analyzing the dynamic simulation using Visual NASTRAN 4D, and it could be recommend the good design parameters for the manufacturing purpose.