• Journal of the Korean Data and Information Science Society
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• v.19 no.1
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• pp.53-69
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• 2008

Six Sigma is a proven management philosophy that can be employed to improve productivity dramatically in various fields of industries. However some companies where Six Sigma is adopted confront stagnancy due to many kinds of causes of impediment. In this paper, the causes of stagnancy in the diverse stages of Six Sigma implementation are studied. Moreover in this paper results of such causes are also discussed.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2002.11a
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• pp.86-128
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• 2002

1. 채소류 수출확대방안 가. 생산 및 수출동향 1). 생산동향 o 채소류 면적은 정체상태에 있으나 수출되는 시설채소 면적은 소비자의 고품질 채소수요 증가에 힘입어 재배면적이 매년 증가추세에 있음 - 시설채소 재배면적 : (90) 40 $\longrightarrow$ (00) 91천ha(128%↑) o 시설채소 생산량은 재배면적의 증가와 재배기술의 발전으로 생산량이 대폭 증가하였음 - 시설채소 생산량 : (90) 1,017 $\longrightarrow$ (00) 3,247천톤(219%↑) (중략)

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 2001.10a
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• pp.297-298
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• 2001

현재 잡아들이는 전세계 수산식품(어류, 갑각류 및 패류)이 6000만톤 정도에서 정체상태인 반면 양식 수산식품의 생산량은 계속 증가추세로 1997년 기준으로 2,400만톤, 2035년에는 1억 2천만 톤을 양식에서 생산해야 할 것으로 추정되어 (New, 1997; 배 등, 1998) 양식산업의 미래를 밝게 하고 있다. 이러한 세계적인 추세에 맞추어 양식 생산성 향상을 위해 어종별 배합사료개발에 박차를 가하고 있다. (중략)

• Cement
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• s.206
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• pp.13-17
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• 2015

2015년 일본의 시멘트 내수는 민간수요가 회복세를 보일 것으로 전망되나 공공수요가 줄어들어 전년대비 0.8% 감소한 4,563만톤을 기록하며 정체상태를 유지할 것으로 보인다. 수출의 경우 내수부진으로 일본 시멘트업체들이 수출에 적극 나설 것으로 예상되어 전년대비 3.7% 증가한 966만톤을 기록할 것으로 전망된다. 2015년 시멘트 생산은 전년대비 1.0% 감소한 6,116만톤을 기록할 것으로 보이지만 킬른 가동률은 계속해서 90%를 웃도는 높은 수준을 유지할 것으로 예상된다. 여기서는 일본의 미즈호종합연구소가 내놓은 '2015년 일본산업동향(시멘트)' 보고서를 통해 일본 시멘트산업의 수급동향 및 일본 주요 시멘트기업 실적에 대해 살펴본다.

• 한국지구과학회:학술대회논문집
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• 2010.04a
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• pp.113-113
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• 2010

1RXS J082513.1+730634는 적색왜성과 축퇴된 별인 백색왜성으로 되어있는 근접쌍성계로서, 광학 망원경 및 적외선 카메라를 이용하여 관측을 수행하였다. 보통 전형적인 격변광성들은 수 일에서 수 주간 몇 등급씩 밝아졌다가 한동안 어두워져 휴지기에 머물게 된다. 반면에 1RXS J082513.1+730634는 밝아진 후 몇 달씩이나 계속 그 상태를 유지하곤 하는 일종의 정체현상을 보이는 매우 특이한 밝기 변화를 보이는데, 그 원인은 아직 정확히 규명되어 있지 않다.

• Defense and Technology
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• no.6 s.148
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• pp.7-14
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• 1991

날로 심화되어가는 과학기술 선진국의 기술보호주의에 적극 대처하고, 자주국방의 조기달성과 과학기술 능력을 배가하기 위하여 우리는 산.학.연 협동으로 정체상태에 있는 국방과학기술마이드(mind)를 다시한번 되살려야 하겠다. 결국 기초연구의 활성화는 우리 과학기술의 내일을 좌우하게 될 것이다. 이러한 의미에서 볼 때 장기 기초연구사업은 2000년대 고도 정밀무기체계의 자주 연구개발을 위한 범 국가적 장기국방투자사업으로서, 산.학.연 및 군의 적극적인 참여와 관련 과학기술인들의 연구의지가 그 어느때 보다도 절실히 요청되고 있다

• Journal of Korean Society of Transportation
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• v.27 no.4
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• pp.115-126
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• 2009

The lane-change behavior usually consists of discretionary lane-change and mandatory lane-change types. For the first type, drivers change lanes selectively to maintain their own driving condition and the second type is the case that the drivers must change the current lane, which can occur in recurrent congestion sections like merging and weaving sections. The mandatory lane-change behavior have a great effect on the operation condition of freeway. In this paper, we first generate data such as traffic volumes, speeds, densities, and the number of lane-change within the merging and weaving sections using the data of individual vehicle collected from time-lapse aerial photography. And then, the data is divided into the stable and congested flow by analyzing the speed variation pattern of individual vehicles. In addition, the number of lane-changing from ramp to mainline within every 30-meter interval is investigated before and after traffic congestion at study sites and the distribution of lane-changing at each 30-meter point is analyzed to identify the variation of lane-changing ratio depending on the stable and congested flows. To recognize the effect of mainline flow influenced by ramp flow, this study also analyzes the characteristics of the lane-changing distributions within the lanes of mainline. The purpose of this paper is to present the basic theory to be used in developing a lane-changing model at the merging and weaving sections on freeways.

• KSBB Journal
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• v.4 no.2
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• pp.150-156
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• 1989

The chaacterisitics of a commercial membrance-coverd electrode in air-saturated saline solution were investigated in terms of a steadystate one-dimensional model. The electrode system miiersed in an aqueous medium consists of three layers: an external concentration boundary layer, a membrance, and an inner electrolyte layer. The membrance can be permeabld to the water and impermeable to the ionic species. In stationary midium, the water migrates from the external medium to the inner electrolyte layer until a thermodynamic equilibrium is reached. In a following midium, however, there is a reverse direction of water movement due to the hyrodynamic pressure differential until both thickness of the electrolyte layer and the membrance are equal.

• Journal of the Korea Society of Computer and Information
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• v.5 no.2
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• pp.98-104
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• 2000

One of the main features of ABR service is the employment of a rate-based flow control mechanism, and congestion control plays an important role in the effective and stable operation of ATM networks Feedback from the network switches to the end system gives users the information necessary to adjust transmission rates appropriately according to the current networks load. Congestion controls by feedback mechanism are classified as EFCI and ER mode. We analyze the performance of EFCI and ER and propose a new ABR traffic control strategy by integrating EFCI and ER modes to improve the traditional traffic control. Through the distributed simulation. the performance improved by the proposed control strategy is analyzed.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.2
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• pp.264-270
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• 2011

The Characteristics of the flowfield around three circular cylinders in tandem arrangement was investigated by PIV. Strouhal numbers, vorticity, velocity vectors and velocity profiles were observed at centre-to-centre space ratios of P/D=1.25~3.75, and Reynolds number of Re=$3.0{\times}10^3{\sim}5.0{\times}10^3$. As the results the Strouhal numbers measured in the rear region of 3rd the cylinder were distinguished three kind of regions with the space ratios and The flow pattern in the wake of each cylinder was different according to these regions. The time averaged flow at region of each cylinder was almost stagnated and the size of the stagnated region was small in order of 1st, 2nd and 3rd cylinder. The direction of vortex at the front and rear region of 2nd cylinder was opposed each other with the small difference(${\alpha}= {\pm}5^{\circ}$) of the attack angle ${\alpha}$.