• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.05a
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• pp.147-152
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• 2006

This paper presents the dynamic characteristics of MR impact damper for vehicle collision system. Various types of mechanism have been proposed for reduce transmitted force to vehicle chassis and finally protect occupants from injury. In the case of frontal collision, the bumper make main role of isolation material for collision attenuation. In this study, proposed bumper system composed of MR impact damper and structures. The MR impact damper is to adopted MR fluid which has reversible properties with applied magnetic field. MR fluid operates under flow mode with Bingham flow and bellows is used for generation of fluid flow. Mathematical model of MR impact damper incorporated with MR fluid is established. Field dependent damping force is investigated with time and frequency domain. The MR impact damper is then incorporated with vehicle crash system. The governing equation of motion of vehicle model is formulated considering occupant model. Dynamic characteristics of vehicle collision system investigated with computer simulation.

• Transactions of the Korean Society of Automotive Engineers
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• v.14 no.3
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• pp.157-163
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• 2006

This paper described the process of improving durability performance of the exhaust decoupler by the plasma nitriding. The properties of plasma nitriding treatment of AIS1304 stainless steel were tested using specimens before applying plasma nitriding to a mesh ring. In order to analyses the effect of plasma nitriding treatment on the mechanical properties, SEM(Scanning Electron Microscopes), roughness and hardness tester were used. Based on specimen plasma nitriding, we could find appropriate condition for application to the mesh ring of decoupler. To confirm the improved durability performance, we compared the number of cycles, which reaches to fracture, of the nitrided decoupler and that of the unnitrided decoupler by the bending cyclic test. In this test, the durability and wear resistance of the mesh ring are significantly improved by plasma nitriding treatment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.9 no.6
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• pp.1500-1505
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• 2008

To evaluate the structural integrity of the nuclear seismic category IIA bellows seal 2" globe valve under the seismic service conditions the seismic analysis was performed in accordance with ASME, section III, ND-3500, 1989 edition. The finite element computer program, ANSYS, Version 10.0, is used to perform both a mode frequency analysis and an equivalent static seismic analysis of the valve assembly. The mode frequency analysis results show the fundamental natural frequency is greater than 33 Hz and does not exist in seismic range, thus justifying the use of the static analysis. The stresses resulted from various loadings and their combinations are within the allowable limits specified in the above mentioned ASME code. The results of the seismic evaluation fully satisfied the structural acceptance criteria of the ASME code. Accordingly the structural integrity on the globe valve was proved.

• Transactions of the Korean Society of Automotive Engineers
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• v.21 no.2
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• pp.154-158
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• 2013

Expansion joint has been utilized in many areas including automotive bellows for exhaust system. Usage of expansion joint has been increased due to its inherent flexibility and excellent anti-vibration property. Simple shape of expansion joint is modeled to understand the behavior of joint system. 27 design cases using 3 design factors with 3 levels are constructed by design of experiment. Each case is simulated to find the most influential design factors. Response for this study, maximum stress in the expansion joint, has been used to determine main design factors of joint. Among the 3 design factors, factor B has affected greatly a response in the formation of optimum shape of joint. Also, interaction factor, $A{\times}B$, has also showed its influence to the response of joint. This study showed that design of experiment combined with finite element analysis could be used in the design decision process effectively in the design of expansion joint.

• Nuclear Engineering and Technology
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• v.53 no.10
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• pp.3438-3448
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• 2021

Dynamic seals are one of the critical components of Absorber Rod Drive Mechanism of Fast Breeder Reactors, requiring separate experimental development. Their significance can't be overemphasized considering that the availability and re-usability of Control Rod Drive Mechanisms of Fast Breeder Test Reactor is governed by the failure rate of dynamic seals (bellows). For prototype and subsequent Fast Breeder Reactors in India, choice of the dynamic seal is changed to an in-house designed & developed labyrinth type V-ring seal. The present work is related to the numerical investigations carried out to gain insights into the sealing mechanism and the thermal behaviour of these seals. The results indicate that the seal geometry is very important for obtaining optimum performance. By changing the geometry of the present seal, performance enhancement by more than 50% in important indices is obtained. Further, the results point out that caution shall be exercised when the seal material & its operating temperature are changed. Also, the numerical model developed in this study will be useful for developing more robust dynamic seals in future.

• Journal of the Korean Society of Industry Convergence
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• v.22 no.2
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• pp.81-86
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• 2019

Although the localization rate of shipbuilding and marine equipment goods is set to be 70 percent by 2020, but the localization rate of equipment and materials for shipbuilding and marine facilities is currently 10 to 30 percent. For Korea's Big 3 shipbuilders, which build 70 percent of the world's largest shipbuilders, localization of shipbuilding equipment and equipment is an essential factor. In particular, there is a growing need to localize equipment and materials in terms of the number of lead standards and A/S. It is expected that there will be a rapid expansion of LNG carriers in the future, and it is necessary to develop equipment and equipment materials of LNG ships. In this study, the design and manufacture of LNG vessel equipment was conducted. Design and basic performance tests of 4-inch QCDC for LNG bunkering were conducted.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2023.11a
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• pp.305-306
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• 2023

지반 침하 및 액상화 등에 따른 과도한 상대변위로 인한 매립배관 시스템의 손상을 저감시키기 위해 종종 벨로우즈 신축이음관은 사용된다. 벨로우즈 신축이음관의 성형과정에서 회선의 벽두께 감소와 같은 구조적인 불확실성이 발생할 수 있으며 특히, 벽두께 감소는 벨로우즈 신축이음관의 성능에 영향을 미칠 수 있다. 매립배관 시스템의 효율적인 유지관리를 위해 회선의 벽두께 감소에 의한 벨로우즈 신축이음관의 성능평가는 필요하다. 하지만 회선의 벽두께 감소가 벨로우즈 신축이음관의 성능에 미치는 영향을 조사하는 연구는 미미하다. 따라서 본 연구는 기초적인 연구로써 고충실도 유한요소 모델을 이용하여 단조하중을 받는 벨로우즈 신축이음관의 벽두께 감소에 의한 성능을 평가하고 민감도 분석을 수행하였다. 각 회선의 벽두께 감소를 20%로 적용하였을 때 최대하중은 약 3% 감소하는 것으로 나타났으며 2번 회선의 벽두께 감소가 최대하중 감소에 비교적 큰 영향을 미치는 것으로 나타났다.

• The monthly packaging world
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• s.254
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• pp.103-119
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• 2014

산업통상자원부가 주최하고 한국생산기술연구원이 주관하는 "제8회 미래패키징 신기술 정부포상"시상식이 이번 달 10일 일산 킨텍스 그랜드볼룸에서 열린다. 미래지식산업인 패키징산업 종사자의 긍지와 자부심 함양의 계기를 실천하고, 패키징산업 종사자의 사기진작과 패키징산업 활성화를 도모하기 위해 매년 진행되고 있는 미래패키징신기술 정부포상은 패키징산업 기술인의 기술개발 의욕을 고취하고 패키징산업 기술성과 및 산업발전 기여도에 대한 정부포상를 실현하며 패키징산업 종사자간 정보교류 극대화 및 공동체 의식 함양으로 일체감을 조성시켜왔다는 평가를 받고 있다. 미래패키징 신기술 정부포상은 기업부문 및 학생부문, 그리고 공로부문으로 나누어 수상자를 선정, 진행되고 있다. 기업부문은 패키징 완제품, 친환경패키징, 패키징관련기계(설비) 및 관련부품, 패키징인쇄(라벨링), 패키징원부자재 생산 및 가공공정, 패키징디자인 등의 분야에서 신기술 개발 또는 개선으로 수출신장, 매출 수익 증대 및 발명특허 획득을 통해 패키징 기술력 발전에 기여한 기업의 패키징제품 또는 패키징디자인을 대상으로 하고 있으며, 학생부문은 패키징 디자인 관련분야 전공자로 패키징과 연관된 컨셉으로 상품성, 창의성, 표현성, 친환경성, 지속가능성 등이 어우러진 독창적인 패키징제품 또는 패키징디자인을 대상으로 진행하고 있다. 또한 공로부문은 패키징 산업 관련 산업계, 학계, 연구계, 유관기관에 종사하는 자로서 패키징 관련 핵심 기술개발, 경영, 마케팅 면에서 패키징 산업 발전에 기여한 공적이 뚜렷한 자, 패키징산업발전 정책연구 및 패키징산업 육성에 기여한 기업 또는 개인을 대상으로 하고 있다. 제8회 미래패키징 신기술 정부포상 심사 결과 (주)연우의 'One Material Pump-Bellows'를 비롯 총 4개사가 산업통상자원부 장관상 수상자로 선정됐으며, 공로부문에서는 (사)한국포장협회의 한용교 명예회장((재)한용교장학재단 이사장)과 김형빈 한국공업포장협회 부설 수송포장기술연구소 소장이 수상자로 선정됐다. 본 고에서는 수상작 및 수상자들의 활약상을 살펴보도록 한다.

• Journal of Institute of Control, Robotics and Systems
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• v.13 no.11
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• pp.1067-1073
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• 2007

This paper presents development of an special metal hydride(SMH) actuator system using a peltier module. The newly developed simple SMH actuator, consisting of the plated hydrogen-absorbing alloy as a power source, Peltier elements as a heat source and a cylinder with metal bellows as a functioning part, has been developed. The SMH actuator is characterized by its small size, low weight, noiseless operation and a compliance similar to that of human body. A new SMH actuator that uses reversible reactions between the heat energy and mechanical energy of a hydrogen absorbing alloy. It is well known that hydrogen-absorbing alloys can reversibly absorb and desorb a large amount of hydrogen, more than about 1000 times of their own volume. To improve the thermal conductivity of the hydrogen-absorbing alloy, an electro-less copper plating has been carried out. For this purpose, the effects of the electro-less copper plating and the dynamic characteristics of the SMH actuator have been studied. The hydrogen equilibrium pressure increases and hydrogen is desorbed by heating the hydrogen-absorbing alloys, whereas by cooling the alloys, the hydrogen equilibrium pressure decreases and hydrogen is absorbed. The SMH actuator has the characteristic of being light and easy to use. Therefore, it is suitable for medical and rehabilitation applications.

• Journal of Korean Academy of Fundamentals of Nursing
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• v.7 no.3
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• pp.366-378
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• 2000

Type 2 Diabetes Mellitus patients have chronic metabolic disorder and they need self care for their lifetime. But most Diabetes Mellitus patients don't know how to do a self care due to the lack of adequate support from health care professionals. It has been reported that lack of exercise therapy compliance guide is very important one. This study was conducted to develop an exercise therapy protocol applied to an efficacy expectation promoting program based on Bandura's self efficacy model for type 2 Diabetes Mellitus patients. Firstly, a conceptual framework was developed through efficacy expectation promoting Program based on Bandura's self efficacy model. In order to identify the contents of program and to design a preliminary protocol, a with the consultation experts was made. A clinical validity was tested using twenty type 2 Diabetes Mellitus patients who received follow-up care regularly through the diabetic out-patient clinic from October, 1998 to May, 2000. After this process, the final protocol was developed. The results of this study are summarized as bellows : The final exercise therapy protocol applied to an efficacy expectation promoting program for type 2 Diabetes Mellitus Patients consists of individualized exercise test and prescription, a small booklet relating personal experience with Diabetes Mellitus and a telephone coaching program for 12 weeks on performance accomplishment, vicarious experience and verbal persuasion, which are all induction modes of efficacy expectation. It is concluded that the exercise therapy protocol applied to an efficacy expectation promoting program is applicable to type 2 diabetes mellitus. And this exercise therapy protocol could show a positive effect on the exercise compliance of Diabetes Mellitus patients.