• 동력기계공학회지
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• 제13권6호
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• pp.51-56
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• 2009

Recently, lots of researchers have been attracted to develop various alternative fuels in diesel engine. The use of biodiesel fuel(BDF) is an effective way of substituting diesel fuel in the long run. But biodiesel fuel can affect the performance and emissions in diesel engine because it has different chemical and physical properties from diesel fuel. In this study, to investigate the combustion characteristics of biodiesel fuel as an alternative fuel for D.I. diesel engine, experiments were carried out at the three-cylinder, four stroke D.I. diesel engine with T/C. As a result, shorter ignition delays were observed for the biodiesel blend cases relative to the diesel oil. The pick value of premixed combustion for the rate of heat release is increased with decreasing C.F.W. temperature.

• 통상정보연구
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• 제5권2호
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• pp.91-112
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• 2003

Nowadays, the spreading of electronic commerce using internet demands a lot of change in business environments, as it is called B2B. Especially, the B2B based EC have a majority rates over the 10% of whole EC markets. As the approach way and the core axis of e-Marketplace in B2B markets are changed more by the business section and industry section than by each company sections, all of the world leading company including Korea are trying to take a prior occupation in e-Marketplace market. In korea, B2B e-Marketplace are mainly leaded by ministry of commerce, industry and energy which choice the company, run a trial managed company. Above MOCIE efforts are now having a lot of trial and error. Accordingly, this thesis are focused on researching the construction trends of B2B e-Marketplace, the future prospects, and promotion plans.

• 품질경영학회지
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• 제7권1호
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• pp.41-50
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• 1979

The purpose of this study is to examine the introduction and its application of objectives management system in practical case, This study attempts to describe, (1) the relationships between the objectives management and budget management (2) analyzed the introduced organization and applicable system for the performance of objectives. Concepts of objectives, as this study is adjusted as follows; i) Objectives must be operational. They must be capable of being converted into specific targets and specific assignments. Therefore, objectives are the basis for work and assignments; they determine the structure of the business, the key activities which must be discharged, and, above all, the allocation of people to tasks. ii) Setting objectives for investment requires also objectives for the structure, basic policies, jobs, and directions of the business itself. They are not selling objectives; They are genuine marketing objectives, and as such have to be built into the way the business itself is set up, directed, structured, and run.

• 산업공학
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• 제13권3호
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• pp.528-538
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• 2000

HLA is a general-purpose software architecture for distributed simulation designed to support a wide range of simulation approaches and application. The US DoD's HLA for modeling and simulation can certainly be regarded as the state of the art in distributed simulation. It is a mandatory standard for military simulation. The purpose of this paper is to describe applications of HLA/RTI in multiple domains across the manufacturing systems society. In many and large scale industrial systems, enormous data is generated, and is to be managed in an effective way. It needs a high performance common network library. Furthermore, it must satisfy the real function of system facilities as much as possible. The RTI is an implementation of the interface specification, provided as a set of services. Some applications focusing on the area of a small manufacturing system were demonstrated. The integration could be achieved using the HLA, together with interface modules for each of the subsystems. We have found that HLA/RTI are cable of meeting the functional requirements for a given system environment.

• Journal of international Conference on Electrical Machines and Systems
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• 제1권2호
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• pp.3-9
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• 2012

The paper describes a novel technique for on line parameter identification of three-phase induction motors from a single, run up to speed test. Data is sampled during this test with the normal locked rotor and synchronous speed data captured on the way to reaching the motor's rated speed. Rotor parameter variations with frequency due to skin and proximity effects and other non-linear imperfections such as heating and main flux path saturation are taken into account. This method is ideal for determining and/or verifying parameters used in high performance drives.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2000년도 가을 학술발표회 논문집
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• pp.737-744
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• 2000

This paper resorts to rock mass rating and rock mass quality to draw value based on the evaluation of rock and to draw interrelation formula in relation to rock mass quality, A comparative analysis was given of survey values reported in the existing documents. This paper has tried to find out the relationship between RMR and Q System for the sake of choosing rational reinforcing patterns and of the safety of tunnels. The results run as follow: RMR=8.251n(Q)+43.83. This paper has also tried to find out the relationship between RMR and Q System by using Fuzzy Approximate Reasoning Concept. We suggest that those in charge should not depend on a single system only after evaluating the classification of rocks, and compare one result with another for the good of keeping track of the condition of base rocks in a better way.

• 대한임베디드공학회논문지
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• 제2권2호
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• pp.107-115
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• 2007

In general, wireless sensor networks composed of many nodes which are located in ad. hoc environment and send the gathered data to sink node support only one way traffic. In those cases, it is not possible to send commands to nodes to react for exceptional events because the networks can not deliver downward data and the nodes run in pre-assigned fixed schedule. This paper expands the WSLP to bidirectional WSLP and implements a fire monitoring system on it, and shows the feasibility of bidirectional USN by demonstrating the usability of the process of reaction to a fire in the implemented fire monitoring system.

• 한국환경복원기술학회지
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• 제10권5호
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• pp.58-66
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• 2007

과거 빗물은 토양으로 흡수되어 정화작용을 거쳐 호수나 강으로 유입됨으로써 하천의 수질 오염을 방지할 수 있었으나 개발로 인한 도시의 불투수층 증가로 빗물은 여과없이 도시의 오염물질을 쓸어 내리며 하천으로 유입되어 하천의 수질 오염이 날로 심해지고 범람하는 빗물은 짧은 시간에 도시를 물에 잠기게 한다. 오염물질을 함유한 빗물의 정화 및 빗물 유량 조절을 위한 방안으로 미국에서는 레인 가든의 조성이 활발하게 진행되고 있다. 본 원고에서는 레인 가든의 환경적 의의와 조성방법, 그리고 빗물로부터 하천을 보호하기 위한 미국의 관련 규정을 알아보고 레인 가든의 효과에 대해 검토하고자 한다. 레인 가든은 오염 물질의 하천 유입방지 및 빗물의 저장 역할 외에 도시지역에서 최소 관리로 생물 서식처 역할을 함으로써 생태도시 조성 기술을 한 단계 높이는 방안이 될 것이다.

• 산업기술연구
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• 제26권B호
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• pp.233-242
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• 2006

Continuous, discrete and semi continuous HMM systems are used for the speech recognition. Discrete systems have the advantage of low run-time computation. However, vector quantization reduces accuracy and this can lead to poor performance. Continuous systems let us get good correctness but they need much calculation so that occasionally they are unable to be used for practice. Although there are semi-continuous systems which apply advantage of continuous and discrete systems, they also require much computation. In this paper, we proposed the way which reduces calculation for continuous systems. The proposed method has the same computational load as discrete systems but can give better recognition accuracy than discrete systems.

• Journal of applied mathematics & informatics
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• 제29권1_2호
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• pp.247-255
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• 2011

Invertible functions with a single cycle property have many cryptographic applications. The main context in which we study them in this paper is pseudo random generation and stream ciphers. In some cryptographic applications we need a generator which generates binary sequences of period long enough. A common way to increase the size of the state and extend the period of a generator is to run in parallel and combine the outputs of several generators with different period. In this paper we will characterize a secure quadratic polynomial on $\mathbb{Z}_{2^n}$, which generates a binary sequence of period long enough and without consecutive elements.