• Journal of Welding and Joining
• /
• 제32권1호
• /
• pp.15-21
• /
• 2014

FCAW(Flux Cored Arc Welding), SAW(Submerged Arc Welding), EGW(Electro Gas Welding), and three-pole SAW are applicable in manufacturing the offshore wind tower. In this paper, mechanical properties of these welded-joints for TMCP steels were evaluated in all above welding processes. The tensile strength of welded-joints for all the welding methods satisfied the standard guideline (KS D 3515). No cracking on weldment was found after the bending test. Changes of weldedments hardness with welding processes were observed. In a weld HAZ (heat-affected zone), a softened HAZ-zone was formed with high heat input welding processes (SAW and EGW). However, the welded-joint fractures were found in the base metal for all cases and small decrease in welded-joint strength was caused by a softened zone. The multi-pole SAW welds exhibited similar mechanical properties comparing to the one with one-pole SAW process.

• 한국주조공학회지
• /
• 제43권1호
• /
• pp.43-49
• /
• 2023

• 산업기술연구
• /
• 제6권
• /
• pp.3-7
• /
• 1986

Multicharacteristic quality control is concerned with monitering production processes and inspecting the quality of a lot when the state of a process or the quality of an item is determined by a number of quality characteristics. This paper reviews procedures currently available for multicharacteristic quality control when the quality characteristics are either variables or attributes.

• 산업경영시스템학회지
• /
• 제23권56호
• /
• pp.55-64
• /
• 2000

There is more than a single quality characteristic and they are often of varying or mixed target types. The purpose of this paper is to develop general strategies for solving the multiple response robust design problem. The desirability function provides an important tool to solve problems that have different types of target since the desirability values all the range between zero and one. Several combinations of arithmetic averages, geometric averages, and standard deviations are used in the various strategies to find the best design point.

• 산업경영시스템학회지
• /
• 제11권18호
• /
• pp.17-26
• /
• 1988

본 논문은 전략적 계획과정에 대한 지능적인 의사결정 지원 시스템의 틀(framework)을 개발하는 것을 목적으로 한다. 전문가 시스템의 능력을 의사결정 지원 시스템에 통합한 지능적인 의사결정 지원 시스템은 사업가나 의사결정자가 전략계획을 효율적이고 효과적으로 분석ㆍ평가ㆍ통제할 수 있도록 한다.

• 산업융합연구
• /
• 제7권2호
• /
• pp.33-44
• /
• 2009

I first present a set of features for distinguishing group learning from other concepts. I then develop a framework for understanding group learning that focuses on learning's basic processes at the group level of analysis: storage, and retrieval.

• 산업융합연구
• /
• 제7권2호
• /
• pp.45-57
• /
• 2009

I first present a set of features for distinguishing group learning from other concepts. I then develop a framework for understanding group learning that focuses on learning's basic processes at the group level of analysis: sharing.

• Korean Membrane Journal
• /
• 제1권1호
• /
• pp.93-99
• /
• 1999

• 한국세라믹학회지
• /
• 제47권1호
• /
• pp.26-38
• /
• 2010

Degradation in Solid Oxide Fuel Cell performance can be ascribed to the following fundamental processes from the materials chemical point of view; that is, diffusion in solids and reaction with gaseous impurities. For SOFC materials, diffusion in solids is usually slow in operation temperatures $800\sim1000^{\circ}C$. Even at $800^{\circ}C$, however, a few processes are rapid enough to lead to some degradations; namely, Sr diffusion in doped ceria, cation diffusion in cathode materials, diffusion related with metal corrosion, and sintering of nickel anodes. For gaseous impurities, chromium containing vapors are important to know how the chemical stability of cathode materials is related with degradation of performance. For LSM as the most stable cathode among the perovskite-type cathodes, electrochemical reduction reaction of $CrO_3$(g) at the electrochemically active sites is crucial, whereas the rest of the cathodes have the $SrCrO_4$ formation at the point where cathodes meet with the gases, leading to rather complicated processes to the degradations, depending on the amount and distribution of reacted Cr component. These features can be easily generalized to other impurities in air or to the reaction of nickel anodes with gaseous impurities in anode atmosphere.

• 멤브레인
• /
• 제20권4호
• /
• pp.267-277
• /
• 2010

가스분리막을 이용한 분리공정은 기존의 분리공정을 대체할 공정으로서 수십 년간 발전이 되어 왔다. 특히 분리막 공정은 가스분리에 있어서 기존공정에 비해서 에너지 소모가 적고 설치에 필요한 공간이 간소하며, 스케일업이 간단한 장점이 있다. 최근에는 기체분리막 공정은 질소발생장치, 수소발생장치, 막제습기, 선박이나 항공기용 불활성기체충진장치, 천연가스 정제, 바이오가스 정제, 연료전지분야에서 널리 사용이 되고 있으며, 향후에는 이산화탄소의 분리에도 강력한 대체공정으로 사용이 될 수 있다. 이러한 가스분리막 공정을 좀 더 널리 보급하기 위해서는 로베슨 플롯의 한계를 넘어설 수 있는 새로운 소재의 개발이 절실하며, 이러한 한계를 돌파하기 위하여 많은 연구자와 회사들이 카도그룹이나 스피로 구조를 가지는 고분자나 PIMs 같은 소재의 개발에 박차를 가하고 있다.