• 산업공학
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• 제22권2호
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• pp.135-143
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• 2009

Six sigma innovation activities have been deployed in the engineering, management, and R&D sectors in an aerospace production company. For the success of total innovation, the company realized that it is necessary to involve the field workers in the six sigma innovation activities. In this paper small group activities in the aerospace production company is introduced. The implementation system, project evaluation and compensation system, and future directions are presented.

• 상하수도학회지
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• 제32권4호
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• pp.317-324
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• 2018

SWRO-PRO hybrid desalination technology is recently getting more attention especially in large desalination markets such as USA, Middle East, Japan, Singapore, etc. because of its promising potential to recover a considerable amount of osmotic energy from brine (a high-concentration solution of salt, 60,000 - 80,000 mg/L) and also to minimize the impact of the discharged brine into a marine ecosystem. By the research and development of the core technologies of the SWRO-PRO desalination system in a national desalination research project (Global MVP) supported by Ministry of Land, Infrastructure, and Transport (MOLIT) and Korea Agency for Infrastructure Technology Advancement (KAIA), it is anticipated that around 25% of total energy consumption rate (generally 3 to $4kWh/m^3$) of the SWRO desalination can be reduced by recovering the brine's osmotic energy utilizing wastewater treatment effluent as a PRO feed solution and an isobaric pressure exchanger (PX, ERI) as a PRO energy converter. However, there are still several challenges needed to be overcome in order to ultimately commercialize the novel SWRO-PRO process. They include system optimization and integration, development of efficient PRO membrane and module, development of PRO membrane fouling control technology, development of design and operation technology for the system scaling-up, development of diverse business models, and so on. In this paper, the current status and progress of the pilot study of the newly developed SWRO-PRO hybrid desalination technology is discussed.

• 한국건축시공학회지
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• 제14권1호
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• pp.45-53
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• 2014

The objective of this study is to assess the requirements of tablet PC-based PMIS applications designed for use on construction sites to determine whether these new programs can play a significant role in increasing the efficiency of a project. In this research, the current market conditions of PMIS running on a tablet PC were analyzed. In addition, two industry surveys were conducted. A research team interviewed some industry experts and identified fourteen useful and desirable functions that can be incorporated into tablet PC-based applications and project management tools. Through a questionnaire survey, the most effective functions for the tablet PC-based PMIS were identified. The three top-rated functions among those suggested were Contact Information for Job-Related Personnel; Receive and Respond to Submittals, RFIs, and Notices; and Problem Solving for Design and Engineering Issues. The results of this research are expected to provide helpful information for mobile application developers and members of other interested groups in the construction industry.

• 한국세라믹학회지
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• 제43권7호
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• pp.439-444
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• 2006

Artificial graphite generally manufactured by carbonization sintering of shape-body of kneaded mixture using granular cokes as filler and pitch as binder, going through pitch impregnation process if necessary and finally applying graphitization heat treatment. Graphite materials are used for core internal structural components of the High-Temperature Gas-cooled Reactors (HTGR) because of their excellent heat resistibility and resistance of crack progress. The HTGR has a core consisting of an array of stacked graphite fuel blocks are machined from IG-110, a high-strength, fine-grained isotropic graphite. In this study, crack stabilization and micro-structures were measured by bend strength and fracture toughness of isotropic graphite grade IG-110. It is important to the reactor designer as they may govern the life of the graphite components and hence the life of the reactor. It was resulted crack propagation, bend strength, compressive strength and micro-structures of IG-110 graphite by scanning electron microscope and universal test machine.

• Journal of Welding and Joining
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• 제34권5호
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• pp.77-82
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• 2016

In this study, Microstructure and hardness of 1st layer with crystallographic orientation were investigated about solidification structure in multipass weld using high Mn-Ni flux cored wire. Microstructure of solidification consisted of austenite matrix and a little ${\varepsilon}-phase$ in grain boundaries. Orientation of grains was usually (001), (101), (111). According to crystallographic orientation, morphology of primary dendrite was different. The depletion of Fe and the segregation of Mn, C, Ni, Si, Cu, Cr, O were found along the grain boundaries. The area of segregation was wide with an order of (001), (101), (111) grains. And hardness of grains with crystallographic orientation increased with an order of (001), (101), (111) grains because of the segregation along dendrite boundary.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.1070-1075
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• 2005

The evaluation items to assess the consumer needs are thought to be varied depending on their age, education and income. It should be noted that consumer needs are getting too diversified to notice them in time due to the rapid economic, social and cultural development. It is, therefore, considered improper to try to assess the level of consumer satisfaction and correct consumer needs by employing one evaluation method for the vastly diversified consumer types. This research is going to conduct a written questionnaire survey to the apartment dwellers in order to identify like dweller groups according to their age, income and education. Then the scope of personal characteristics of each group will be identified and the importance assessment model will be developed. Then the items on the POE will be weighted according to the assessed importance. Finally a method of developing the customer satisfaction index will be produced to quantify how much the consumers are satisfied with the project.

• 한국추진공학회지
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• 제21권2호
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• pp.18-25
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• 2017

무노즐 부스터에 사용하는 추진제의 연소특성에 관한 연구를 수행하였다. 밀도비추력을 향상키기기 위하여 고체 추진제의 조성에 Al와 Zr의 금속연료들이 도입되었으며 무노즐 부스터를 설계하기 위하여 낮은 압력지수 및 고 연소속도가 추진제의 주요 연소특성으로 연구되었다. Zr을 함유하는 추진제는 Al을 함유하는 추진제보다 높은 연소속도를 보였으며, $13{\mu}m$ Zr을 함유하는 추진제는 연소속도는 35 mm/s (at 1000 psi)와 압력지수 0.3282를 보였다. 이러한 결과로부터, 무노즐 부스터에서 Al와 Zr을 함유하는 추진제를 사용하는 이점을 보였다.

• 한국건설관리학회논문집
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• 제12권4호
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• pp.29-39
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• 2011

최근 국내에서는 쇠퇴도시 재개발, 도시의 균형발전, 도시 이미지 창출을 목적으로 메가프로젝트 규모의 사업이 활발히 추진되고 있다. 메가프로젝트 사업은 다양한 주체들에 의해 장기간에 걸쳐 대규모로 추진되는 특성으로, 참여주체간의 복잡한 이해관계와 갈등, 부적절한 시설규모 계획을 통한 사업성 저하 등의 문제점이 야기되고 있다. 이러한 문제점을 해결하기 위해서는 사업초기단계에서 비용절감 및 성능향상 효과를 최대한 발휘할 수 있으며 다양한 시설의 규모적 특성을 기능중심적 사고를 통해 지원할 수 있는 VE 적용이 필수적으로 요구된다. 하지만, 사업초기단계에 대한 가용정보의 부족, 기존 방법론의 부재 등으로 인하여 사업초기단계에서의 VE적용은 미흡한 실정이다. 따라서 본 연구에서는 사업초기단계 메가프로젝트의 문제점과 VE적용의 한계를 해결하기 위한 방안으로, VE준비단계에서의 VE팀 구성, Quality Model, 성능지표, Space Model을 제안하였다. 본 연구의 결과는 메가프로젝트의 기획/계획단계에서 VE 수행을 위한 기초적인 자료로 활용될 수 있을 것으로 기대된다.

• 공학교육연구
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• 제10권2호
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• pp.44-61
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• 2007

본 논문은 공학 교육에서 강조하고 있는 창의력, 협업 능력 및 의사소통능력의 함양을 주 목적으로 홍익대학교 기계 시스템디자인공학과에서 새로이 개발한 교과목에 관하여 소개하고자 한다. '기계 시스템 디자인공학과'는 엔지니어링 디자인을 강조하는 새로운 교과목을 갖춘, 기존 홍익대학교 기계공학과의 새로운 이름이다. 급변하는 교육환경과 산업계의 요구에 부응하기위해서 기계공학과는 아날로그 기반, 산업중심의 하드한 관점에서 디지털 기반, 인간 중심의 소프트한 가치 중심으로 그 교육 접근방식을 전환하였다. 이러한 관점에서 새로이 개설된 세 가지 학과목인 기계 시스템디자인 개론, 창의적 공학 설계, 제품디자인은 공통적으로 팀 프로젝트를 통해서 손으로 직접 만들고 대화하고 표현하는(이하 Hands-on experience)경험을 중요시 하고 있다. 또한 이들 과정에서는 브레인스토밍(Brain Storming)과 스케치를 통한 시제작(Prototyping) 과정을 강조하고 있으며, 전통적으로 다루기 힘들고 무거운 금속 소재 대신에 폴리스티렌 블록이나 카드보드와 같은 가볍고 유연성 있는 소재를 사용하여 가능한 다양하고 창의적인 원형(Prototype)을 만들고, 팀원들간의 활발한 의사소통을 체험 할 수 있도록 유도하였다. Hands-on experience 중심 프로그램들은 학생들로 하여금 협업능력을 강조한 학과목들을 통해 시각적이며 구체적인 체험을 하게 하여 전통적으로 분석적이고 수학적이며 추상적인 사고에 초점을 맞춘 공학과목들을 균형적으로 보완하는 역할을 할 것으로 보이며, 졸업 후 그들이 산업현장에서 접하게 될 복잡하고 구체적인 엔지니어링 과제들을 해결하는 엔지니어링 감각과 창의력을 개발하는데 중요한 역할을 할 수 있을 것으로 예상된다.

• 국제학술발표논문집
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• The 6th International Conference on Construction Engineering and Project Management
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• pp.540-543
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• 2015

Solar energy is one of the most important alternative energy sources which have been shown to meet high levels of heating and cooling demands in buildings. However, the efficiencies to satisfy these demands using solar energy significantly vary based on the characteristics of individual building. Therefore, this paper is focused on developing the methodology which can help to design optimal solar system for heating and cooling to be in cooperated within the existing buildings according to their load profiles. This research has established the Solar Heating and Cooling (SHC) system which is composed of collectors, absorption chiller, boiler and heat storage tank. Each component of SHC system is analyzed and made by means of Modelica Language and Pistache tool is verified the results. Sequential approximate optimization (SAO) and meta-models determined to 15 design parameters to optimize SHC system. Finally, total coefficient of performance (COP) of the entire SHC system is improved approximately 7.3% points compared to total COP of the base model of the SHC system.