• Journal of Institute of Control, Robotics and Systems
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• v.13 no.2
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• pp.133-139
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• 2007

An unmanned ground vehicle can perform its mission automatically without human control in unknown environment. To move up to a destination in various surrounding situation, navigational information is indispensible. In order to be adopted for an unmanned vehicle, the navigation box is small, light weight and low power consumption. This paper suggests navigation system using a low grade MEMS IMU for supplying position, velocity, and attitude of an unmanned ground vehicle. This system consists of low cost and light weight MEMS sensors and a GPS receiver to meet unmanned vehicle requirements. The sensors are basically integrated by loosely coupled method using Kalman filter and internal algorithms are divided into initial alignment, sensor error compensation, and complex navigation algorithm. The performance of the designed navigation system has been analyzed by real time field test and compared to commercial tactical grade GPS/INS system.

• Proceedings of the IEEK Conference
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• 2001.10a
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• pp.29-33
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• 2001

The production of Secondary Non-ferrous Metals (SNM) is characterized by low investment, energy consumption and cost, less pollution as well as rather simple technology. In the past years, the SNM industry has seen relevantly rapid progress in China. Especially in the filed of clean hydrometallurgical treatment certain novel technologies for recovery and separation have successfully been elaborated, and a number of medium and small commercial plants established. On the basis of four common metals Cu, Al, Pb, Zn, and Ni, Co, this paper describes the status quo and progress of SNM industry in China, indicating that a lot of work should still be done in salvage of waste metals. It is recommended that measures for collecting and classifying SNM resource should be strengthened and the research on new technologies for scavenging such metals should be supported.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.172-174
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• 1999

In Korea, the consumption of renewable energy among primary energies has marked only 1.03%, composed of mostly hydro power facilities, as of 1998. This situation has been basically due to the market limit and high generation cost of renewable energies. Furthermore, the policies and strategies for promoting the renewable energy have been insufficient in comparison with that of the developed countries. This paper mainly focuses on the economic feasibility and sensitivity analysis for renewable energies.

• Journal of the Korea Furniture Society
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• v.16 no.2 s.30
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• pp.27-36
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• 2005

Surface materials of furnitures are continuously studied and marketed with new patterns and new technology so as to create designs and fashions but even professionals are also difficult in distinguishing natural materials from artificial materials. Like this, furniture industry is required for rapid coping with the preference of customers which requires high grade of consumption pattern and is rapidly changed; it is intended to review the current situation of our furniture industry. The purpose of this thesis is to activate furniture industry and elevate the importance of surface materials in assumption of continuous R&D based on systemic data analysis of the kinds and colors of surface materials used in the companies within rank five of sales volume in domestic furniture companies.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2016.05a
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• pp.118-119
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• 2016

γ-C₂S is known as a kind of substance that it does not react with water at room temperature. However it could react with the CO₂ producing CaCO₃ and silica gel as the carbonation products. Thus γ-C₂S can be used as a mineral addition to improve the compressive strength and durability of concrete. On the other hand, the manufacture of γ-C₂S can give an effective utilization of industrial by-product with low energy consumption and low CO₂ emission. This paper aims to summarize the development situation on this field.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.1
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• pp.153-160
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• 2018

A pressure vessel consists of an inner tank and the outer tank; the material of the inner tank is austenite stainless steel, and the outer tank is general carbon steel. As the storage amount increase, the size of the inner tank for LNG also increases, which eventually increases the weight of the LNG storage tank. The Cold Stretch method can transport and store the LNG in a larger amount than the conventional pressure container, and the weight of the pressure vessel can also be reduced at 50 70% due to the reduction of the thickness, which is excellent from an economic and energy consumption perspective. Although the Cold Stretch method has these advantages, the domestic situation has not developed any related legislation. In this study, the actual production of pressure vessels using the Cold Stretch method will be processed and the volume expansion after the Cold Stretch will be checked and compared with the mechanical properties.

• Proceedings of the Korean Magnestics Society Conference
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• 2013.12a
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• pp.90-90
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• 2013

Since discovery, NdFeB permanent magnet has replaced application of the conventional magnets rapidly because of its superior physical and mechanical properties. With increasing consumption of power combined with energy resource depletion, energy efficiency is becoming more and more inportant. According to recent reports, almost almost half of the electric power is consumed by motor, and NdFeB magnets which are the core component of the motor play a key role on improving energy efficiency of the devices. In parallel with finding alternatives energy resources, research works improving energy efficiecy have been conducted world wide. Althogh NdFeB magnets usage have been expanded to various applications, key materials such as Nd and Dy, resouces lean heavily on specific area, China. Magnetic industry revently experienced skyrocketing price fluctuatioin of rare earth at around 2008. Chineses government's regulations worsened the situation and arose a necessity to develop methods to minimize rare earth use. In this presentation, POSCO's recent research works on rare earth reduction is presented including novel powder alloying method using nitrate precursors. Also, future R&D plans for rare earth free magnets is briefly introduced as well.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.206-212
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• 2009

Chemical behaviors of each surface material for interior facilities affect to fire initiation and growth in general fire situation. These chemical behaviors were characterized by thermal properties (Heat release rate, Pyrolysis rate, specific heat, etc) which could be derived from experimental test. Especially, Heat release rate which indicates aspect of fire size is one of the most important property to asses fire hazard and protection needs. The cone calorimeter test (ISO 5660) has recently assumed to a dominant role in bench scale fire testing to obtain the Heat release rate of materials. This value could be calculated by the 'Oxygen Consumption Method' under various producing irradiances to each surface of materials. In this study, Process of the cone calorimeter test was simulated by Pyrolysis model of FDS (Fire Dynamics Simulator by NIST) base on the ISO 5660 international standard. Then, we could estimate the simulation method of FDS in case of single materials through the comparative study with test results.

• Smart Media Journal
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• v.3 no.2
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• pp.37-42
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• 2014

In this paper, the function design of smart media platform control with smart monitoring, and displaying modules which have the priorities of smart plug based smart outlet, is proposed for electrical suppliance of essential information appliance in emergency power consumption situation(blackout, peaktime etc). The effect of power management will be maximized by this smart gateway interlocking with ESS(energy storage system) which has bi-directional power transmission control modules, and smart outlet based on the priority control actions.

• Journal of Korean Society of Forest Science
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• v.23 no.1
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• pp.45-48
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• 1974

결론적(結論的)으로 목재공업(木材工業)은 분산형태(分散形態)로 폐재(廢材)의 수집(收集) 및 그 종류(種類)도 다양(多樣)하므로서 자원화(資源化)로는 원료(原料)의 제약(制約), 생산규모(生産規模), 생산시(生産時)의 공해발생(公害發生), 제품의 수요 등 유동적(流動的)이며 상대적(相對的)인 가변인자(可變因子)가 많다. 그럴수록 그 특성(特性)을 충분(充分)히 살리는 집약적(集約的)이며 다변적(多邊的)인 이용(利用)을 꾀하면서 최신(最新)의 가공기술(加工技術)과 시설(施設)의 도입(導入)을 검토(檢討)하며 그의 연구지원(硏究支援)도 뒤따라야 하겠다.