• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1563-1566
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• 2002

A 16-bit adiabatic datapath for micro-power RISC processor is designed. The datapath is composed of a 3-read and 1-write multi-port adiabatic register file and an arithmetic and logic unit. A four-phase clock generator is also designed to provide supply clocks fer adiabatic circuits and the driving capability control scheme is proposed. All the clock line charge on the capacitive interconnections is recovered to recycle energy. Adiabatic circuits are designed based on efficient charge recovery logic(ECRL) and are implemented using a 0.35 fm CMOS technology. Functional and energy simulation is carried out to show the feasibility of adiabatic datapath. Simulation results show that the power consumption of the adiabatic datapath including supply clock generator is reduced by a factor of 1.4∼1.5 compared to that of the conventional CMOS.

• International Journal of High-Rise Buildings
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• v.7 no.2
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• pp.161-170
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• 2018

Rapid urbanization, resource depletion, and limited land are further increasing the need for skyscrapers in city centers; therefore, it is imperative to enhance tall building performance efficiency and energy-generative capability. Potential performance improvements can be explored using parametric multi-objective optimization, aided by evaluation tools, such as computational fluid dynamics and energy analysis software, to visualize and explore skyscrapers' multi-resource, multi-system generative potential. An optimization-centered, software-based design platform can potentially enable the simultaneous exploration of multiple strategies for the decreased consumption and large-scale production of multiple resources. Resource Generative Skyscrapers (RGS) are proposed as a possible solution to further explore and optimize the generative potentials of skyscrapers. RGS can be optimized with waste-energy-harvesting capabilities by capitalizing on passive features of integrated renewable systems. This paper describes various resource-generation technologies suitable for a synergetic integration within the RGS typology, and the software tools that can facilitate exploration of their optimal use.

• Proceedings of the Korean Society of Machine Tool Engineers Conference
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• 2005.05a
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• pp.278-281
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• 2005

Today, manufacturing capability at the micro or nano scale production field is requested strongly in view of parts and product miniaturization. Miniaturized parts and products will introduce lots of benefits in terms of high precision functionality and low energy consumption. This paper presents the results of micro milling machine tool development for micro machining process. Finite element analysis has been performed to know the relationship between design dimensional variables and structural stiffness in terms of static, dynamic, thermal aspects. Performance evaluation through machining has been tested and discussed for achievable machining characteristics.

• International Journal of Naval Architecture and Ocean Engineering
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• v.5 no.1
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• pp.21-32
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• 2013

Marine transportation industry is undergoing a number of problems. Some of these problems are associated with conventional marine fuel-oils. Many researchers have showed that fuel-oil is considered as the main component that causes both environmental and economic problems, especially with the continuous rising of fuel cost. This paper investigates the capability of using natural gas and hydrogen as alternative fuel instead of diesel oil for marine gas turbine, the effect of the alternative fuel on gas turbine thermodynamic performance and the employed mathematical model. The results showed that since the natural gas is categorized as hydrocarbon fuel, the thermodynamic performance of the gas turbine cycle using the natural gas was found to be close to the diesel case performance. The gas turbine thermal efficiency was found to be 1% less in the case of hydrogen compared to the original case of diesel.

• Journal of the Korean Institute of Navigation
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• v.20 no.2
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• pp.85-95
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• 1996

The purpose of this reserch is the development of 406MHz satellite EPIRB terminals which is used on Cospas/Sarsat system. This equipment is essencial facility in all vessel due to should be equipped according to GMDSS. This 406MHz satellite EPIRB needs high technology of complicated. Because, this is designed to operate stably with ultra-stability oscillator and with the low power consumption so that can operate continually for 48 hours by the contained battery. The development of this equipment is significant in the sides of acquirement of new technology on satellite communication fields. In this research, we investigated the international and domestic regulations of needed. Because this equipment is international system concerned with life of man. So, we designed the adequate hardwares and softwares from this research. From this research, we developed the equipment with appopriate capability for productions, and much more research is needed to develop the more small size more chip one for production.

• Transactions of Materials Processing
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• v.7 no.6
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• pp.610-619
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• 1998

The superplastic blow forming technology has advantages of cost reduction and low material consumption. compared to the conventional sheet metal forming technology due to the capability of precisely forming with high elongation and low flow stress. however it has a disadvantage that its partial thickness distribution is non-uniform. A processing technology like diaphragm forming has been developed even though it is difficult to prepare materials for superplastic blow forming. in this study a hemisphere forming of sheet before superplastic forming. It was found that the rotary forming material was less in quantity of cavitation at pole than that of hemisphere part that was superplastic formed without rotary forming treatment. Also discussed are the critical strain which is closely related to cavity shape and size.

• 제어로봇시스템학회:학술대회논문집
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• 2001.10a
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• pp.30.4-30
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• 2001

In this paper, design and integration of a newly developed double-tracked mobile robot called ROBHAZ-DT are introduced. It is designed to carry out military and civil missions in various hazardous environments such as the areas of fire, war, disaster and mine field etc. ROBHAZ-DT is configured with three mechanical bodies, namely front, rear and main body. By using its rotational passive adaptation mechanism equipped between the front and rear bodies, ROBHAZ-DT shows a good mobile capability on uneven terrain including stairs. The passive adaptation mechanism reduces energy consumption and offers simplicity in the design of the ROBHAZ-DT ...

• Journal of Dairy Science and Biotechnology
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• v.38 no.4
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• pp.237-239
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• 2020

Processes that products we consume that contain dairy foods comprise planning → design → production → quality/suitability assessment → safety verification → launch → distribution → consumption. Analysis of nutrients and potential toxins at each stage in the production process is essential to verify food quality, suitability, and safety. Products display ingredient lists and nutrient content to help consumers choose healthy foods. These products should also be fully assessed for microbes and toxins before reaching consumers. Products require verification through test inspections. However, this step has reduced value from a food manufacturer's viewpoint, because it does not visibly impact real economic trends. The most important first step in determining the quality and suitability of products is the inspection capability of food companies.

• International Journal of Internet, Broadcasting and Communication
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• v.16 no.3
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• pp.16-26
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• 2024

Mobile edge computing (MEC) plays a crucial role in improving the performance of resource-constrained mobile devices by offloading computation-intensive tasks to nearby edge servers. However, existing methods often neglect the critical consideration of future task requirements when making offloading decisions. In this paper, we propose an innovative approach that addresses this limitation. Our method leverages recurrent neural networks (RNNs) to predict task sizes for future time slots. Incorporating this predictive capability enables more informed offloading decisions that account for upcoming computational demands. We employ genetic algorithms (GAs) to fine-tune fitness functions for current and future time slots to optimize offloading decisions. Our objective is twofold: minimizing total processing time and reducing energy consumption. By considering future task requirements, our approach achieves more efficient resource utilization. We validate our method using a real-world dataset from Google-cluster. Experimental results demonstrate that our proposed approach outperforms baseline methods, highlighting its effectiveness in MEC systems.

• THE INTERNATIONAL COMMERCE & LAW REVIEW
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• v.43
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• pp.423-453
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• 2009

Import Agency Service Mall, which provide customers not only with convenient shopping experiences but also with purchasing, warehousing, shipping, and customs clearance services, have been playing a significant role in rapidly transforming Korean consumers into global consumers. The consumers' great demand for foreign goods(services) created Import Agency Service Mall(referred to hereafter as IASM) as a new business model of distribution and consumption, which seems to grow rapidly. Accordingly, this study examined the e-Trust by analyzing the characteristics of IASM, determinants of trust, risk perception and its association with e-Trust in IASM, and finally applying the result to general internet shopping mall(referred to hereafter as GISM). The following results came out from the analysis: First, from the result of checking these two types of internet shopping mall consumers have different determinants of trust. Second, from the question if two types perceive different risk, purchasing the foreign goods, it came out that they showed critical difference in variable relevant to goods delivery and customer service. IASM perceived risk from those two variables more than GISM Third, from the review of the relationships between determinants of trust and risk perception variables, IASM showed interrelation among all the variables except between customer service and perceived risk. Fourth, the researcher examined how the risk perceived in the course of purchasing goods has an effect on consumers e-Trust. In case of IASM, risk perception relevant to customer service had an effect on consumer e-Trust. To the contrary, incase of GISM, risk perception didn't have any effect on e-Trust. Finally, from the review of interrelation between determinants of trust and consumer e-Trust, it came out that for IASM capability had an effect on consumer e-Trust and for GISM consumer service had an effect on consumer e-Trust.