Earticle

본 연구에서는 저경도 고감쇠 고무받침 시험체의 다양한 특성실험을 통하여 저경도 고감쇠 고무받침의 특성을 파악하였다. 고무받침의 파악하고자 하는 특성은 압축강성, 전단강성, 등가감쇠비, 전단특성의 변형율 의존성, 전단특성의 면압 의존성, 전단특성의 주파수 의존성, 전단특성의 온도 의존성, 극한전단특성 등이다. 특성실험은 ISO 22762-1에 따라 수행하였으며, ISO 2276-3에 따라 평가하였다. 특성실험결과 전단강성은 전단변형율과 온도 의존성이 큰 것으로 나타났고, 등가감쇠비는 면압 의존성이 큰 것으로 나타났다. 전단특성의 주파수 의존성 실험결과 0.1Hz를 기준으로 경향이 나뉘는 것으로 나타났다. 0.1Hz 이상에서는 전단특성의 변화가 적었지만, 0.1Hz 이하에서는 전단강성과 등가감쇠비 모두 급격히 감소하는 것으로 나타났다. 추가적으로 크리프실험과 극한전단특성실험을 수행하였고, 실험결과는 ISO 22762-3의 요구사항을 만족하는 것으로 나타났다.

In this paper, the characteristics of low hardness high damping rubber bearings(HDRB) were studied through various prototype tests. The low hardness HDRB were tested to evaluate vertical stiffness, shear stiffness, equivalent damping ratio, various dependencies of shear properties, ultimate shear properties and other factors. The prototype test was performed according to the specifications of ISO 22762-1, and evaluated according to the specifications of ISO 22762-3. The results of the prototype test showed that shear strain and temperature were the factors that most greatly influenced shear stiffness, and that compressive stress was the factor that most greatly influenced the equivalent damping ratio. The frequency dependence test of shear properties showed that two general tendencies of frequency dependence could be observed. At frequencies over 0.1Hz, the changes in shear properties were small. However, at frequencies under 0.1Hz, the changes in shear properties rapidly decreased. The creep test and the ultimate shear test were also performed, and both of them satisfied the requirements of ISO 22762-3.

Line type rigid bearings for Open-Steel-Plate-Girder railway bridges have several problem in service, and they are unstable structurally. Thus, spherical bearings having advanced maintenance capability and device to resistance up-lift are developed and replace the existing ones. A experiment of maintenance for a new placed spherical bearings under real Open-Steel-Plate-Girder bridge is conducted and their good maintenance performance is proved. The dynamic behavior of the bridge is measured and analyzed for the two cases of the existing and replacing bearings. Therefore, the effect of the new spherical bearings on the railway bridge is assessed.

기존의 면진 기술을 일반건물에 적용하기 위해서는 낮은 가격과 낮은 무게로 면진 탄성받침 이 제작 및 공급되어야 할 필요가 있다. 이에 본 논문에서는 일반건물에 면진 기술을 적용하기 위한 방법으로 기존의 적층고무 면진 탄성받침에 철판을 대체하여 섬유로 보강하고, 고무와 섬유의 층으로 구성된 스트립형의 면진 탄성받침을 제안하였다. 또한 제안한 섬유보강 면진 탄성받침을 설계 및 제작하여 수직실험과 수평실험을 수행하여 그 성능을 검증하였다. 따라서, 스트립형의 면진 탄성받침이 제작가능하며, 필요한 크기로 절단이 가능함을 보였다. 또한 수평 실험 수직 실험을 통하여 기존의 적층고무 면진 탄성받침을 대체하여 사용할 수 있음을 보였다. 이 연구결과로 인해 스트립형의 섬유보강 면진 탄성받침이 저가건물에 널리 사용될 수 있을 것으로 기대된다.

In order to apply seismic isolators to low-cost buildings, seismic isolators have to be low-cost and light. In this paper fiber reinforced strip form isolator in which the steel plates of conventional rubber bearing were replaced by fiber was proposed. The proposed fiber reinforced strip form isolator was designed, fabricated, cut and subjected to vertical test and horizontal test. Therefore, fiber reinforced strip form isolator was to be shown valid in the view point of fabrication and application to desired size. The horizontal test and vertical test have shown that fiber reinforce strip form isolator could be replaced the rubber isolator. By these results, low-cost and light seismic isolator can be applied to the low-cost building.

In this paper, shock analysis was performed for coarse and fine mesh model using MSC/NASTRAN and ANSYS after substituting the foundation of deck mounted equipment of marine ship for mass-spring system. In order to determine input file in MSC/NASTRAN, dynamic response analysis was also performed using DDAM based on the calculation in the range of low frequency. It was confirmed that the coarse mesh model has the sufficient effective weight in a lower degree mode compared to fine mesh model.

The purpose of this study is to analyze errors in single-final consonant pronunciation encountered by foreign learners in the early stages of acquiring Korean and to find educational measures according to the types of these errors. We aimed 238 students from the International Educational Center and the Korean Language Education Department to analyze the types of error in sentences or words, and detailed the learning plans according to the type of error. In particular, in order to conduct pronunciation correction education, “Introduction- Explanation-Demonstration-Survey” was conducted, We considered it that understanding and acquiring the difference in the case where consonants except [ㄴ,ㅇ,ㅅ] being used as initial consonants was an effective learning method to shorten the Korean language acquiring period.

점자 사용자들 사이에 약자의 활용이 자료의 부피를 줄이고 읽기 속도를 증가시킬 것이라는 인식이 광범위하게 퍼져 있다. 이 연구에서는 현행 ‘한국 점자 규정’의 한글점자 약자 중 받침 쌍시옷과 ‘ㅓㅇ’ 약자 폐지 및 소괄호의 점형 변경이 점자 자료의 부피와 점자 읽기 속도에 미치는 영향을 실증적으로 검증하는 것을 목적으로 하였다. 시각장애인들이 널리 구독하고 있는 “점자새소식” 4개 호를 조사한 결과 받침 쌍시옷과 ‘ㅓㅇ’ 약자를 폐지하고 소괄호의 점형을 변경할 경우, 부피가 1.3%(총 1,358줄 중 18줄) 증가하는 것으로 나타났다. 시각장애 성인 20명과 시각장애 중학생 24명을 대상으로 현행 ‘한국 점자 규정’을 적용한 자료와 한글점자 약자 축소 및 소괄호 점형 변경 내용을 적용한 자료의 읽기 속도를 비교한 결과 통계적으로 유의미한 차이가 없는 것으로 나타났다. 이 연구의 결과는 한글점자 약자 일부의 축소와 소괄호 점형 변경이 점자 자료 부피를 미미한 수준에서 증가시키기는 하지만, 점자 읽기 속도에는 유의미한 차이를 가져오지 않는다는 점을 시사한다.

A perception that the use of contraction would reduce the volume of Braille materials and increase the reading speed has been pervasive among braille users in Korea. The purpose of this investigation was to identify whether the elimination of contractions for final consonant ‘ssang-si-ot’ and ‘eo yi-eeung’ and the modification of braille symbol for open-&-close parenthesis influence the volume of braille materials and the reading speed. The findings indicated that there was an increase of 1.3% in the volume of braille materialswhen aforementioned changes were applied. It was also found that there was no significant difference in reading speed among braille users who participated in this study. Based on these findings, it can be concluded that the elimination of contractions for final consonant ‘ssang-si-ot’ and ‘eo yi-eeung’ and the modification of braille symbol for open-&-close parenthesis did not have a significant impact on either the volume nor the reading speed of braille materials.

신라 석탑의 탑신받침은 지지하는 아래쪽 부재인 갑석 상면에 각형 2단으로 조출하는 방식이 일반적이었다. 그러나 순수하게 탑신받침 자체를 별석으로 조성한 석탑들도 건립되었으나, 이에 대해 구체적인 연구는 없었다. 별석 탑신받침은 단순한 받침형식의 변화 양상이 아니라 신라 석탑 중 이형석탑의 조영 특징을 밝혀줄 수 있는 중요한 요소로서 검토할 필요가 있다. 탑신받침의 연원에 대해서 목조건축의 가구 구조에 의한 부분일 것이라는 기존 견해를 수긍하면서 기존 견해와 달리 기단부와 본 건물의 사이에 조성되던 葛石이라는 부분이 탑신받침의 연원일 가능성을 제시하였다. 신라 석탑에서 별석 탑신받침을 보이는 석탑들은 경북지역 특히 경주에 집중적으로 분포하고 있어 지역적 특징을 보임을 알 수 있다. 별석 탑신받침의 형식은 크게 감입형과 판석형으로 분류하여 다시 조성방식에 따라 세부적으로 살펴보았다. 감입형에서 점차 부재를 줄여가는 일반적인 신라 석탑의 양식 흐름에 따라 판석형으로 변화하였고 가장 많은 형식은 판석형-1형식으로 단층기단 석탑에서 주로 채택하였음을 확인하였다. 고려시대에도 신라 별석 탑신받침의 영향을 받아 각형 2단의 탑신받침 형식이 조성되고 있어 별석 탑신받침이 꾸준히 계승되고 있음을 알 수 있다. 마지막으로 별석 탑신받침은 다양한 석탑 유형의 전개라는 측면과 석탑이 목탑을 번안하였음을 보여줄 수 있는 하나의 지표적인 요소로 볼 수 있다는 점이 신라 석탑사에서 갖는 가장 큰 의의라고 생각된다.

The common way that underpinnings were built for stone stupas in Silla was to put a two-story square shape section on top of the flat stone laid on another stone, the supporting the member of framework at the bottom. However, there were stone stupas whose underpinnings were built purely with different stones, but there has been no concrete research on them. Underpinnings made of different stones deserve a review as an important element to shed light on the changing patterns of underpinning forms and also the construction characteristics of non-typical stone stupas of Silla. Accepting the old view that the origin of underpinnings must be a part of furniture structure in wooden buildings, the investigator raised a possibility that curb stone, which was built between the stylobate and the main body, might be their origin unlike the old view. The Silla stone stupas whose underpinnings made of different stones are particularly concentrated in Gyeongju, Gyeongbuk Province, which indicates that they had local characteristics. Underpinnings made of different stones were categorized into the insertion type and flagstone type and examined in more details according to the construction methods. The insertion type was replaced by the flagstone type according to the general flow of styles among Silla stone stupas characterized by the gradual decrease of the member of framework. The most popular form was the flagstone type-1, which was usually adopted for stone stupas with a single-story stylobate. Influenced by the underpinnings made of different stones of Silla, they built a two-story square shape underpinnings in Goryeo, which indicates that underpinnings made of different stones had continued to be transmitted. Finally, underpinnings made of different stones hold the greatest significance in the history of Silla stone stupas in the aspect of the development of various stone stupa types and as an indicator to show that stone stupas were adapted from wooden ones.

유연한 고무재료와 강재 보강판을 적층으로 구성한 탄성받침은 우수한 수직강성과 유연한 횡강성으로 교량의 내진보강용으로 널리 사용되고 있다. 무엇보다 시공이 간단하고 비용이 높지 않다는 장점을 지니고 있다. 고무재료의 한 종류인 합성고무는 천연고무에 비해 노화에 대한 저항성이 크지만 이 역시 다양한 열화요인으로 성능이 저하된다. 내진설계기준 및 내진성능평가요령에서는 이러한 노화의 특성을 반영하고 있지 않지만 관련 연구가 축적되면 이를 반영하는 것이 합리적이다. 합성고무를 대상으로 노화촉진시간과 노출시간을 변수로 하여 노화촉진시험을 수행하여 전단특성의 변화를 분석하였다. 노화가 진행될수록 최대전단응력과 전단변형율은 감소한다. 또한 동일한 전단변형률에서 전단강성이 크게 증가한다.

Elastomeric bearings composed of flexible rubber materials and steel reinforcement plates are widely used for seismic retrofit of bridges due to their excellent vertical stiffness and flexible lateral stiffness. Especially, it has the advantages of simple construction and low cost. Chloroprene rubber, a type of rubber material, has greater resistance to aging than natural rubber, but its performance is also degraded due to various deterioration factors. Although these aging characteristics are not reflected in the seismic design standards and seismic performance evaluation guidelines, it is reasonable to reflect this when related studies are accumulated. For chloroprene rubber, accelerated heat aging test was performed with variables of heating temperatures and exposure time to analyze shear characteristics. As aging progresses the maximum shear stress and shear strain decrease. Also, the shear stiffness is greatly increased at the same shear strain.

유연한 고무재료를 사용하는 탄성받침은 최근 교량의 내진보강용으로 많이 적용되고 있다. 그러나 다양한 요인에 의하여 고무재료의 노화가 진행되고 이로 인해 탄성받침의 전단강성에 변화가 생기고 이는 교량의 내진성능에 영향을 미친다. 천연고무를 대상으로 노화촉진시간과 노출시간을 변수로 하여 노화촉진시험을 수행하여 전단특성의 변화를 분석하였다. 노화가 진행될수록(노화촉진온도 및 노출시간이 증가할수록) 최대전단응력과 전단변형율은 감소한다. 또한 동일한 전단변형률에서 전단강성이 크게 증가한다. 이는 고무재료가 경화됨을 의미하며 탄성받침의 내진성능이 저하되는 것을 암시한다.

Elastometic bearings using flexible rubber materials have recently been widely applied for seismic retrofit of bridges. However, due to various factors, the aging of the rubber material progresses, which causes the shear stiffness change of the bearing, which affects the seismic performance of the bridge. For natural rubber, accelerated heat aging test was performed with variables of heating temperatures and exposure time to analyze shear characteristics. As aging progresses (i.e. increase of temperature and exposure time), the maximum shear stress and shear strain decrease. Also, the shear stiffness is greatly increased at the same shear strain. This means that the rubber material is hardened, implying that the seismic performance of the elastomeric bearing becomes poor.

본 연구에서는, 고유의 색과 항산화 활성이 있는 로젤 꽃받침을 활용하고자 로젤 꽃받침 분말을 대조군, 0.5%, 1%, 1.5% 및 2% 첨가한 설기떡을 제조하여 수분, pH, 색도 및 외관, 조직감, 항산화능 및 소비자 기호도를 분석하였다. 설기떡의 수분 측정 결과 0.5% 시료의 수분함량이 40.60%로 가장 높았으며, 2% 시료의 수분함량은 37.37%로 가장 낮았다. pH는 로젤 꽃받침에 함유된 다량의 유기산의 영향으로 로젤 꽃받침 분말의 첨가량이 증가함에 따라 유의적으로 감소하였다(p<0.05). 경도와 씹힘성의 경우, 대조군과 비교하여 로젤 꽃받침 분말 첨가시 유의적으로 증가하였으며, 1% 시료를 제외한 로젤 꽃받침 분말 첨가 시료들의 응집성은 대조군에 비해 유의적으로 감소하는 경향을 보였다(p<0.05). 탄력성의 경우, 시료들 간 유의적인 차이가 없었다. 로젤 꽃받침 분말 첨가량이 증가함에 따라 설기떡의 수분함량과 pH가 감소하여, 경도와 씹힘성의 증가에 영향을 준 것으로 여겨진다. 명도는 로젤 꽃받침 분말의 첨가량이 증가함에 따라 유의적으로 감소하는 경향을 나타내었고, 적색도와 색차값은 유의적으로 증가하는 경향을 나타내었다(p<0.05). 로젤 꽃받침 분말 첨가 시료들의 황색도는 대조군과 비교하여 유의적으로 증가하는 경향을 나타내었다(p<0.05). 로젤 꽃받침의 안토시아닌은 설기떡 제조과정에서 파괴되지 않고 고유의 색을 나타낼 수 있으므로, 로젤 꽃받침 분말은 설기떡 제조 시 천연 착색제로 활용될 수 있을 것으로 사료된다. 총 폴리페놀 함량은 로젤 꽃받침 분말 첨가량이 증가함에 따라 유의적으로 증가하는 경향을 나타내었으며, 플라보노이드 함량은 로젤 꽃받침 분말을 첨가하지 않은 설기떡과 비교하여 로젤 꽃받침 분말을 첨가한 설기떡에서 높았다(p<0.05). ABTS $IC_{50}$은 로젤 꽃받침 분말 첨가량이 증가함에 따라 유의적으로 감소하는 경향을 나타내었다(p<0.05). 이를 통해 로젤 꽃받침 분말 첨가 시 항산화 활성이 있는 설기떡을 제조할 수 있음을 확인하였으며, 더 나아가 로젤 꽃받침을 다른 음식에 적용하였을 때에도 천연 항산화제로서 유용성이 있을 것으로 판단된다. 소비자 기호도 조사 분석 결과, 대조군과 1% 첨가군 두 가지가 종합적으로 가장 높은 점수를 받았으며, 항상화능은 로젤 꽃받침 분말함량이 가장 큰 2% 첨가군이 가장 높았으나, 신맛이 강하여 설기떡 제조에 적합하지 않을 것으로 사료된다. 이상의 결과로 미루어 보았을 때, 로젤 꽃받침 분말을 1% 첨가하는 것이 설기떡 제조에서 적절할 것으로 판단되며, 천연 착색제, 천연 항산화제로서 로젤 꽃받침을 식품산업에 활용할 수 있을 것으로 사료된다.

Roselle (Hibiscus sabdariffa L.) is a shrub which grows well in a tropical climate. There are large amounts of anthocyanins, organic acids and other compounds in roselle. Mostly, roselle is cultivated to use its red calyx. Its calyx is used as a natural food colorant and commonly consumed as a tea. This quality study was conducted to investigate the characteristics and antioxidant activities of Sulgidduck with roselle calyx powder. Four samples and a control were made with different ratios of added roselle calyx powder (0.5%, 1%, 1.5%, 2%). The moisture content of the 0.5%-sample was the highest as 40.60%, and that of the 2%-sample was the lowest as 37.37%. The pH of samples significantly decreased from 6.26 to 3.65 as the amount of roselle calyx powder increased (p<0.05). The L-value of samples also significantly decreased (p<0.05). In contrast, a-value and ${\Delta}E$ of samples significantly increased with elevated amounts of roselle calyx powder (p<0.05). The b-value of roselle calyx added Sulgidduck samples significantly increased compared to the control (p<0.05). Hardness and chewiness of Sulgidduck samples with added roselle calyx also significantly increased compared to the control (p<0.05). Cohesiveness of Sulgidduck samples with roselle calyx significantly decreased compared to control (p<0.05), with the exception of the 1% sample. There were no significant differences in springiness among samples. Total phenolic contents significantly increased when roselle calyx powder was added above a level of 1.5% (p<0.05). The flavonoid content of the control was the lowest as 0.73. ABTS radical scavenging activity significantly increased with increasing amounts roselle calyx powder (p<0.05). The 2%-sample got the lowest sensory preference scores in sweetness and overall acceptability. In contrast, the control and 1%-sample got the highest sensory preference scores. Based on these study findings, addition of 1% roselle calyx powder optimized the preparation of Sulgidduck and roselle calyx is therefore a useful natural colorant and antioxidant.

대형 전동기에서 영구자석을 받치는 철제 받침대의 형상은 요크와의 결합력을 결정하는 매우 중요한 요소이다. 대형 전동기에서 받침대의 형상에 따라 요크와의 결합력 차이가 있다. 이 논문에서는 이중 받침대(Double bed)와 단일 받침대(Single bed)의 결합력을 가상공극 법을 통해 계산하여 차이점과 문제점을 제시하고 단일 받침대가 결합력 향상 측면에서 우위에 있음을 보여준다. 또한 받침대의 아래에 홈(Groove) 형상을 새김으로해서 받침대와 요크 간의 결합력이 향상됨을 보인다

The shape of a iron bed supporting a permanent magnet in a large-sized motor is a important factor for determining the coupling strength with the yoke. In a large-sized motor, there is a difference in electromagnetic force with the yoke depending on the shape of the iron bed. In this paper, we show the differences and problems by calculating the electromagnetic force between the double bed and the single bed through the virtual air gap, and show that the single bed is superior in terms of the binding force. It is also shown that the binding force between the bed and the yoke is improved by carving the groove shape under the bed.

서울지하철 9호선 930정거장은 서울시의 유일한 순환노선인 지하철 2호선 하부를 통과하는 시공이 이루어지고 있다. 본 연구에서는 가교형받침 공법 시공 중 열차하중으로부터 발생하는 진동과 2호선 박스구조물의 고유진동에 따른 공진현상에 대하여 연구하였다. 현장계측과 수치해석을 이용하여 제안된 공법의 동적 안정성 검토하였고, 공진현상이 일어날 수 있는 임계속도를 확인 하였다. 고유치 해석결과 예상된 지하철의 임계속도는 164.4 km/h, ktx는 222.7 km/h로 나타났으며, 현장계측과 수치해석 결과 약 80% 유사한 경향을 나타내었다. 수치해석 결과 지하철의 운행속도 범위에서는 공진이 일어나지 않았으며, ktx의 경우는 운행속도 범위인 222.7 km/h에서 공진이 일어나는 것을 확인했다. 본 연구에서 검증된 결과를 통해 유사한 현장에 적용이 가능 할 것으로 사료된다.

The subway station of 930 that passes underneath Seoul subway line #2 which is the only circulation line in Seoul Metropolitan is constructed in Seoul subway line #9. In this study, the resonance phenomenon which is caused by the natural frequency of the subway line #2 structure and vibration from train operation during construction of temporary bridge is investigated. The dynamic stability of the proposed method is investigated using numerical analysis and field measurement. The results of the eigenvalue analysis evaluated from train operation speed is 164.4 km/h and ktx is 222.7 km/h. The comparisons between field measurements and numerical analysis showed a similar trend which is 80% between two, approximately. The numerical results are that resonance phenomenon of the subway will not happen under the operation speed, and also shows the resonance phenomenon at the same speed of eigenvalue analysis. It should be useful to apply for similar cases.

The fluid loading effect has been investigated for the shipboard equipment foundation mobility with finite element model. For the purpose, two kinds of finite element models for 60m class ship have been developed: global and local model. The former is for low frequency range and the latter for middle frequency range. These finite element models contain added mass explaining fluid loading effect. Added mass has been implemented with virtual mass matrix derived from Laplace equation governing fluid surrounding ship hull. The mobility assessment result for diesel generator foundation of the objective model shows that the fluid loading effect should be considered, especially in low frequency range, to more accurately assess shipboard equipment foundation mobility.

Railway construction in the random vibration natural phenomena, as well as a relatively regular train loads for dynamic loads, such as a usability and safety should be ensured. Vibration due to train loads and seismic vibrations caused by wind compared to the typically very small in size, rather than the safety of the structure affects the usability. Recently in the downtown area, ground and underground facilities, such as a permanent facility that may cause excessive vibration increases, associated with the construction of these transportation facilities on ground vibrations of structures has been increasing concern and complaint. More recently, high-speed train vibration and noise due to furnace is increasing. In order to solve this problem, such as soundproof considering several feet, but by applying the vibration and noise reduction measures insufficient for the study is Free. In this study, track structure, track, and the inside of the building to support the system, the different forms of neurological history and share about the history cheonanahsan high-speed rail, if passed by the bus stop on the train loads of noise, and the history of interior noise and vibration measurement / analysis of measurement results to assess the relative comparison with the relevant provisions were reviewed. Based on this history, future plans for the design of the bridge to reflect the results of a study is intended to provide information. Waiting for the analysis of vibration and noise reduction, cheonanahsan history passed quietly in the train, on average, appeared to 67.53dB and 65.41dB nervous week on average, were measured with the history. Nervous week waiting room of history and the history cheonanahsan radically different shapes and sizes, so a direct comparison is impossible, but the vibration caused by the disc on the base of the polyurethane elastomer disk is not supported by GERB SYSTEM Waiting more effective in reducing the noise level considered in The main materials for railway and for the localization will help to ensure affordability is considered.

본 논문은 적층고무받침을 이용하여 지진으로부터 교량의 손상피해를 줄이기 위한 연구이다. 적층고무 받침은 지진 발생시 변위를 증가시키고, 주기를 길게하여 하중을 전환시킨다. 적층고무받침과 같은 면진장치에 몇 가지 지진파를 가진하여 진동대 실험을 하였다. 이 실험에서는 가속도계와 하중계, 변위계를 설치하여 상판의 가속도 및 전단력 등을 측정하였다. 더구나 적층고무받침을 설치한 경우와 지진격리장치를 설치하지 않은 경우로 구분하여 진동대 실험하여 그 성능을 비교 평가하였다. 실험결과 상판의 가속도 및 전단력은 적층고무받침을 사용할 경우 응답이 감소하였다.

This paper was investigated on the laminated rubber bearing, which mitigates damages of bridges from threat of earthquakes. Laminated rubber bearing can bear large loads for long periods of time and be capable of large deformations during an earthquake. To evaluate seismic isolation with laminated rubber bearing on several earthquake waves, we performed a shaking table test. In this test, deck acceleration was measured by accelerometers and shear force on piers was surveyed by load cells. Furthermore, seismic capacity of isolated systems with laminated rubber bearing was compared with non-isolated systems through shaking table test. The results show that deck acceleration and shear force were relatively reduced by laminated rubber bearing.

Reduction of the structure-borne noise of the naval vessel is very important in order to reduce the underwater radiated noise of it. One of the important factors to reduce the structure-borne noise of the installed machine in a ship is the design of the foundation having sufficiently high mechanical impedance. In this paper, the mechanical impedance of the foundation for the fan-coil unit in a naval vessel is evaluated numerically according to variation of the thickness of the foundation. And also, the forced vibration analysis is conducted considering the dynamic property of the anti-vibration mount. Through the analysis results, it can be known that the dynamic property of the anti-vibration mount should be considered when the minimum level of the mechanical impedance of the foundation is set.

The method of conductor wiring is that a messenger wire is installed, the end of the wire is connected to the conductor and a engine puller pulls the conductor. The length of one section of wiring is $3{\sim}5km$ and one group messenger wire pulls simultaneously $2{\sim}4$ group conductor, while a tensioner maintains wiring tension to prevent the deflection of the conductor. However, there are many obstacles such as roads, power lines, communication lines, buildings, farms and crops. Therefore to prevent damage from conductor deflection a staging is used. The currently used staging is scaffolding lumber which is difficult to secure and it's construction efficiency is very low because it requires a lot of time and manpower. So this study developed a insulating defense tube and pipe connecting device, and a truss structure fabrication module using steel pipe which reduces construction time and cost through a compressive and dielectric strength test.