• 융합보안논문지
• /
• 제13권1호
• /
• pp.25-30
• /
• 2013

본 논문에서는 국내 물류산업의 경쟁력을 높이고 물류 선진화를 도모하기 위한 성과지표를 분석하고 세부적인 IT서비스를 제시한다. 여기서 물류 기업의 성과는 크게 효율성, 지속가능성 및 경제성 측면으로 구분하여 평가지표를 설정하고 IT서비스는 기업 및 공공물류로 분류하여 기업들에게 필요한 IT서비스를 분석한다. 아울러 사례연구로서 평택항 관련 종사자 즉, 물류기업 및 무역업, 공무원, 지역주민 등을 대상으로 실시한 설문조사 결과(SPSS 분석)를 통하여 물류기업의 현황을 진단하고 우선적으로 요구되는 물류 IT서비스의 우선순위를 조사한다. 분석결과, 물류산업의 생산성과 효율성을 높이기 위하여 전문인력의 확보와 표준화가 요구되고 시급한 IT서비스로서 물류자동화 기계화, u-Port 구축, 녹색친환경물류 그리고 물류보안 기술의 구현이 필요함을 알 수 있다.

• 자원환경지질
• /
• 제41권5호
• /
• pp.625-633
• /
• 2008

니켈은 20세기에 들어와 철강, 군수 산업의 발달로 활용분야는 다양해졌고, 그 수요도 계속 증가추세에 있다. 그리고 최근 5년간 가격이 큰 증가세를 보여 안정적인 공급이 각 수요부문의 중요한 문제로 부각되었다. 하지만 국내외적으로 스테인리스강 제조부문을 비롯한 주요 수요처의 소비동향만을 파악할 뿐 완전한 니켈의 물질흐름을 파악하지 못해, 원료에서 최종제품 및 응용제품에 이르기까지 발생되는 스크랩 및 폐기물로부터 니켈의 회수와 재활용이 만족할만한 수준에 이르지 못하고 있다. 보고체계와 통계자료가 미비한 국내 현실이지만, 국내로 수입되고 유통되는 니켈을 조사하여 보다 확실한 니켈의 물질흐름 정립과 재활용 정책을 위한 기초자료를 제공하기 위해 본 연구를 시행하였다.

• 산업경영시스템학회지
• /
• 제15권26호
• /
• pp.1-11
• /
• 1992

Material Handling equipments such as hoists, cranes, storage and retrieval machines, gantry robots and conveyors are carrying out more important tasks in material flow automation field. This paper is concerned with the characteristic and the position of this industry, and presents the status of the business world scale, supply and demmand. import and export transition, and directing posts of the profits. Also it gives productivity security and activity.

• 한국항해항만학회지
• /
• 제35권2호
• /
• pp.131-136
• /
• 2011

As the faithful performance of ISPS of IMO, nowadays actually applicable an integrated safety and security system in and out of vessel should be organized in views of seafarers. Therefore, this paper is aimed to design a fundamental system for ship's integrated safety and security. The system of integrated grabbing will affect efficiently in any maritime field of material and human flow. Therefore this research will be expected to affect economical side by securing all the risk of maritime issues. In addition to the passenger ship and merchant vessel, it is applicable to other public and private vessels either. As a result of this paper, the system designed collecting various data through integrating the system including RFID reader, PIR sensor, and CMOS camera by putting an individual number into each unit that could be control at easy.

• Nuclear Engineering and Technology
• /
• 제51권8호
• /
• pp.2026-2033
• /
• 2019

Fluidelastic instability of a tube array is a key factor of the security of a nuclear power plant. An unsteady model of the fluidelastic instability of a tube array subjected to two-phase flow was developed to analyze the fluidelastic instability of tube bundles in two-phase flow. Based on this model, a computational program was written to calculate the eigenvalue and the critical velocity of the fluidelastic instability. The unsteady model and the program were verified by comparing with the experimental results reported previously. The influences of void fraction and the tube's material properties on the critical velocity were investigated. Numerical results showed that, with increasing the void fraction of the two-phase flow, the tube array becomes more stable. The results indicate that the critical velocities of the tube array made of stainless are much higher than those of the other two tube arrays within void fraction ranging from 20% to 80%.

• 자원리싸이클링
• /
• 제14권2호
• /
• pp.43-55
• /
• 2005

세계의 인구증가와 경제성장에 따라 천연자원 특히 전략금속의 수요가 급격히 증가하고 있다. 국가가 보유하고 있는 자원의 양은 천연자원 뿐 아니라 재활용을 통하여 얻을 수 있는 폐자원을 함께 포함해야 한다. 본 연구에서는 전략금속의 안정적 확보와 폐자원의 효율적 재활용을 위하여 코발트의 국내외 사용현황 등을 조사하였으며 아울러 미국 내에서의 코발트 물질흐름에 대한 자료를 정리하였다. 그 결과 미국에서는 2003년도에 약 8,000톤의 코발트가 사용되었으며 원료로 재사용된 스크랩의 양은 총사용량의 28%인 2,200톤이었다. 미국의 경우 초합금과 촉매의 재활용은 잘 이루어지고 있으나 자석류와 초경합금의 경우 재활용율이 다소 낮음을 알 수 있었다.

• 한국방재안전학회논문집
• /
• 제16권4호
• /
• pp.33-43
• /
• 2023

장마와 같이 장기간에 내리는 강우나 단기간에 많은 양의 강우가 내리는 집중호우의 영향으로 산사태, 토석류와 같은 산지재해가 발생한다. 산사태와 토석류는 인적, 물적 피해를 야기하므로 이를 예방하기 위한 다양한 대책의 적용과 연구가 수행되고 있다. 토석류 재해 연구 중 토석류 수치모형은 비교적 간단하게 연구지역에 대한 위험도를 분석할 수 있다. 다만 경험에 의한 방정식이 적용되어 모형마다 다른 결과를 나타내고 입력변수도 모델마다 차이가 있어 수치모형의 검증은 필수적이다. 본 연구에서는 토석류 수치모형을 이용하여 토석류의 피해를 저감하기 위한 시설인 사방댐과 종단구조물인 계간수로를 반영하여 이에 따른 저감효과를 비교·분석하였다.

• 대한조선학회논문집
• /
• 제46권6호
• /
• pp.667-674
• /
• 2009

The researches on the development of composite material underwater vehicle propeller have been actively attempted for the reduction of radiation noise with outstanding damping effects. Composite material propellers have almost been designed and produced by the foreign experts, and it is difficult to obtain the related informations about their flow, vibration, material characteristics because they are treated as the secrets with close relationship to the military technology, especially in the case of underwater vehicles. For the security of domestic manufacture of composite material propeller and the comparison and examination of its performance and radiation noise characteristics with those of German CONTUR composite material propeller, two propellers were self-produced according to the fiber weaving and array using compressible molding process and their self performances and radiation noise characteristics were measured. The mean fluctuations of blade tip of self-produced composite material propeller were increased and the radiation noises in the low frequency band were reduced compared to those of CONTUR, which could be estimated as the change of material characteristics and also be thought to be used for the future research informations.

• Transactions on Electrical and Electronic Materials
• /
• 제17권1호
• /
• pp.1-6
• /
• 2016

Ensuring the secure operation of power systems has become an important and critical matter during the present time, along with the development of large, complex and load-increasing systems. Security constraints such as the thermal limits of transmission lines and bus-voltage limits must be satisfied under all of a system’s operational conditions. An alternative solution to improve the security of a power system is the employment of Flexible Alternating-Current Transmission Systems (FACTS). FACTS devices can reduce the flows of heavily loaded lines, maintain the bus voltages at desired levels, and improve the stability of a power network. The Unified Power Flow Controller (UPFC) is a versatile FACTS device that can independently or simultaneously control the active power, the reactive power and the bus voltage; however, to achieve such functionality, it is very important to determine the optimal location of the UPFC device, with the appropriate parameter setting, in the power system. In this paper, a genetic algorithm (GA) method is applied to determine the optimal location of the UPFC device in a network for the enhancement of the power-system loadability and the minimization of the active power loss in the transmission line. To verify our approach, simulations were performed on the IEEE 14 Bus, 30 Bus, and 57 Bus test systems. The proposed work was implemented in the MATLAB platform.

• 한국농공학회논문집
• /
• 제58권5호
• /
• pp.39-47
• /
• 2016

The houses are formed in the lower part of the mountain slope face in most agricultural areas of Korea, and old residents accounting for a large portion of the agricultural populations cannot respond to the evacuation quickly when the landslide happens, and the possibility the life damage occurs is high. Therefore, it is urgent to arrange the measure on this. This study is intended to develop the personal disaster evacuation apparatus that can be installed in the house to minimize the life damage by the landslide and to develop the self-initiative evacuation apparatus. This study suggested the load applicable to the personal disaster evacuation apparatus by quantitatively analyzing the effect of the load of rockslides and avalanches caused by the landslide on the structure. Also, the material property of materials was calculated through the tension and bending intensity test after making the specimen of glass fiber reinforced plastic (GFRP) member. The load weight and material property drawn from this study can be used as the basic material for the stability analysis of the personal disaster evacuation apparatus.