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발전기 비동기 투입에 의한 터빈-발전기 축계 고진동 해소 사례
정혁진(Hyuk-Jin Chung),이우광(Woo-Kwang Lee),송우석(Woo-Sok Song) 한국소음진동공학회 2020 한국소음진동공학회 논문집 Vol.30 No.5
This paper presents the diagnosis and cause analysis method for the abnormal vibration of turbine generator shaft system that occur as a result of out-of-phase synchronization of a generator of the power plant. In addition, it introduces the practical example of correcting the generator high vibration to the power generation industry. The torque applied to the shaft system because of the out-of-phase synchronization was calculated, and the change in shaft vibration with respect to applied torque was analysed using the vibration signal analysis. Lastly, various corrective actions are explained for the shaft vibration reduction during planned preventive maintenance. The vibration was finally stabilized by replacing the generator shrunk-on coupling.
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이혁진(Lee Hyuk-Jin),고형선(Koh Hyung-Seon),한용희(Han Yong-Hee),김홍택(Kim Hong-Taek) 대한토목학회 2006 대한토목학회논문집 C Vol.26 No.6
쏘일네일링공법은 굴착벽체나 사면을 안정화시키기 위한 보강공법으로서, 시공성과 경제성의 이점으로 인해서 그 사용량이 증가하고 있다. 그러나 쏘일네일링공법은 대지경계선 뒤쪽으로의 시공이 불가피하며 이는 대지점용료의 문제를 초래하게 된다. 이러한 이유로 제거식 쏘일네일링공법이 개발되었으나 제거식 쏘일네일의 제거율은 50 ~ 70% 정도 밖에 미치지 못하고 있다. 이러한 문제를 해결하기 위하여 제거가 불필요하고 대지경계선 뒤쪽의 삽입시 지주의 동의가 필요없는 섬유보강플라스틱(FRP) 쏘일네일이 개발되었다. 본 연구에서는 시험시공 및 인발시험과 같은 현장시험과 수치해석을 통하여 FRP 쏘일네일링 시스템의 안정성과 거동특성을 평가하였다. 그리고 다양한 지반조건에서 현장시험시공과 인발시험을 묘사하기 위한 수치해석(FLAC 2D)을 실시하였다. 본 연구결과, 제거식 쏘일네일링 시스템과 비교하여 FRP 쏘일네일링 시스템은 제거식 쏘일네일과 유사한 거동특성을 나타냈다. 따라서, FRP 쏘일네일의 사용성과 안정성이 사용하기에 충분한 것으로 나타났으며 기존의 제거식 쏘일네일에 대한 좋은 대안이 될 것으로 기대된다. Soil nailing is a reinforcement method used for stabilizing excavated walls or slopes. Due to its much advantages such as ease of construction and economical efficiency, use of soil nailing is increased. However, the soil nail has much disadvantages for use in urban area. The soil nail needs to be installed inevitably beyond private land boundary, which causes rent for use. For this reason, removable soil nailing system was developed. However, the removal rate of this system is just about 50?70%. To resolve this problem, the Fiber Reinforced Plastic (FRP) soil nailing system which does not need to be removed and allows for the installation beyond private land, is developed. In this paper, through theoretical and experimental studies in laboratory and field such as prototype tests, pullout tests, we evaluate the stability and behavior characteristics of the FRP soil nailing system. And, numerical analyses using FLAC2D were performed with respect to various soil conditions, where prototype test for excavation wall and pullout tests were carried out. As a result of this study, the FRP soil nailing systems show similar behavior characteristics with those of removable soil nailing system. Finally, considering the serviceability and mechanical stability of FRP soil nailing systems, it is enough to be used as a good alternative of general soil nailing system.
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최혁진,엄준호,조정아,이선,이경미,이인수,박용근,Choi, Hyuk-Jin,Eom, Joon-Ho,Cho, Jung-Ah,Lee, Sun,Lee, Kyoung-Mi,Lee, In-Soo,Park, Yong-Keun 한국미생물학회 2000 미생물학회지 Vol.36 No.4
소장의 상피세포내로 세균 세포가 들어가는 과정(invasion)은 Salmonella의 감염에서 중요한 단계이다. invasion은 Salmonella type III 분비장치에 의해 분비되는 단백질들에 의해 유도된다. type III 분비단백질들은 특이하게, 일반적인 분비단백질들이 가지는 N-말단 분비 신호 펩타이드를 가지고 있지 않는 것을 알려져 있다. Yersinia에서의 최근 연구에서 type III 분비장치에 의해 인지되는 분비신호는 분비 단백질을 암호화하는 mRNA의 5'말단부의가 형성하는 2차 구조에 있을 것이라는 보고가 있다. 본 연구에서는 Salmonella type III 분비장치의 분비신호를 조사하기 위해 type III 분비단백질중 하나인 sopE를 택하여 ompR과의 translational fusion을 만들었다. translational fusion을 위해 사용된 sopE DNA절편은 프로모터와 시작 콘돈으로부터 10, 15 코돈을 포함하는 절편이다. Immunoblot으로 확인한 결과, OmpR을 포함하는 fusion 단백질이 형질전환 Salmonella 세포로부터 분비되었다. 이러한 결과는 Salmonella의 type III 분비신호가 분비단백질을 암호화하는 mRNA의 5'말단에 위치할 가능성을 제시하고 있다. 또한, 이러한 분비신호를 활용하여 유용한 외래 단백질을 세균 세포 내에서 효과적으로 생산, 분비할 수 있는 secretion vector의 원형을 개발하였다. Invasion process of bacterial cell into intestinal epithelium is important in Salmonella infection. The invasion is induced by the proteins secreted by type III secretion appratus of Salmonella. It has been known that the proteins do not have N-terminal signal peptide existing in general secreted proteins. Recent studies on Yersinia reported that secretion signal of type III appratus may lie on 5'end secondary structure of mRNA of secreted protein. In this study, we constructed translational fusion of ompR and sopE, encoding type III secretion protein of Salmonella, and observed secretion of the fusion protein for investigating the secretion signal of Salmonella type III appratus. The sopE DNA fragments of the translational fusion contain the region of promoter and from start code to tenth or to fifth code. These translational fusions indicate that type III secretion signal of Salmonella is located on 5'end of mRNA encoding secreted protein. We constructed prototype of secretion vector using this signal to produce useful foreign protein.
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이혁진(Lee Hyuk Jin) 한국사진지리학회 1997 한국사진지리학회지 Vol.5 No.1
Angkor, the cradle of Cambodian culture and ancient capital of the Angkor dynasty is located in the Northwestern part of Cambodia. In 1992 tourism areas of Angkor was designated as one of cultural assets in the world. The purpose of this paper is to describe characteristics of cultural tourism areas in Angkor province using photograph. Their basic geographical and historical conditions have been analysed using literature review. The findings of this paper are summarized as follows. First, cultural remains in Angkor are composed of Roluos, Angkor Wat and Angkor Thom, Preah Khan, and Banteay Srei areas. But Angkor is widely known as Angkor Wat and Angkor Thom. Second, Angkor Wat is one of the most famous temples in Angkor and was constructed in the 12th century AD during the reign of King Suryavarman II. The temple is designed on the Hindu and Buddhistic concepts revolving around mountain Meru, the pivot of the world. The Sanctum sanctorum of Angkor Wat is situated at the top of the complex. The central Meru surrounded by 4 towers represents 4 cardinal directions raised high aboved 3 terraces. Religious continents are represented through enclosures separated by moats, symbolising the oceans: The temple has a powerful space to join the world of man to the world of the gods. Third, Angkor Thom was built as fortified city wall by Jayavarman VII. This is composed of Angkor Thorn Gates, Bayon Temple and Terrace of the Elephants. Angkor Thom is surrounded by 8m high wall containing 5 gates. Bayon is central temple of Angkor Thom and Terrace of the Elephants is located in old royal palace destroyed by war. Enormous faces surrounded by 4 sides are carved on the all Angkor Thom Gates and many towers of Bayon. It was supposed that faces were sculptured after the model of the Goddess of Mercy or Jayavarman VII. Fourth, Angkor Wat and Angkor Thom are living testimonies to ancient Khmer knowledge and skill, inspired by two great rulers. But Angkor wat and the other monuments in Angkor are examples of how vegetative growth and weathering can destroy monuments. The nearby temple of Ta Prohm, for example, is a frightening example of what could happen. These are the major hazards faced by ancient constructions and cultural tourism areas. Thus regular preventing of destruction by climate, vegetation, rain is essential. Finally, this paper is focused on description of characteristics of cultural tourism areas in Angkor. But from now the further studies on Cambodia shall be needed because it is important to propose fundamental data for students to research tourism fields and for tourists to travel this country.
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상용 S/W를 이용한 소형가스터빈엔진 회전체의 동적 구조해석 및 검증
정혁진(Chung, Hyuk-Jin),이종원(Lee, Chong-Won),홍성욱(Hong, Seong-Wook),유태규(Yoo, Tae-Gyu) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.1
The accurate prediction of dynamic characteristics of high speed rotors, such as gas turbines, is important to avoid the possibility of operating the machinery near the critical speeds or unstable speed regions. However, the dynamic analysis methods and softwares for gas turbines have been developed in the process of producing many gas turbines by manufacturers and most of them have seldom been disclosed to the public. Recently, commercial FEM softwares, such as SAMCEF, ANSYS and NASTRAN, started supporting some rotordynamics analysis modules based on 3-D finite elements. In this paper, the dynamic analysis method using commercial S/W, especially ANSYS, is attempted for the small-size gas turbine engine rotor, and the analysis capability and limitations of its rotordyamics module are evaluated for further improvement of the module. As the preliminary procedure, the rotordyamic analysis capability of ANSYS was tested and evaluated with the reference models of the well-known dynamics. The limitations in application of the rotordynamics module were then identified. Under the current capability and limitations of ANSYS, it is shown that Lee diagram, a new frequency-speed diagram enhanced with the concept of $H{\infty}$ in rotating machinery, can be indirectly obtained from FRFs computed from harmonic response analysis of ANSYS. Finally, it is demonstrated based on the modeling and analysis method developed in the process of the S/W verification that the conventional Campbell diagram, Lee diagram, mode shapes and critical speeds of the small-size gas turbine engine rotor can be computed using the ANSYS rotordynamics module.
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