A new system to ensure fire resistance of high strength concrete column in high-rise building with an permanent formwork made of insulation materials has been being studied. In this study, the fire resistance performance of the permanent formwork to the mixture of materials was estimated

This study was performed an evaluation of physical & mechanical properties of mortar by Non-Sintered binder of ball milling time according to fineness.

In this study, KS F 2405 was used to investigated the compressive strength of property of high performance concrete (HPC) using the fly ash and silica fume. The experiments were carried out silica fume-binder ratio from 5% (SF5) and fly ash 25%+silica fume 5% (FA25SF5). The compressive strength of HPC determined on 7days and 28days.

Recent advancement of domestic industries and imports and exports due to increased economic power with the rise, demands the construction of the harbor structures, and a variety of structures have been constructed of reinforced concrete. Most of these harbor facilities located in the uppe rpart of the repair and reinforcement does not work smoothly. In this paper, FRP Composite Panel shows the effect applied to the harbor facilities.

Recently, retrofits by using fiber reinforced polymer (FRP) have been widely performed for strengthening of reinforced concrete structure. However, in spite of the weakness of FRP for fire, the research result of it is not enough for practical use. In korea, fire is most frequent disaster which occurs in building. This means the improved structural capacity of building by a retrofit with FRP may be lost by fire if the FRP was not properly protected from it. This paper present a fire test of concrete block reinforced by FRP. From the test, it was found that the bond capacity of FRP attached to concrete decreased from temperature loading of 65℃.

The purpose of the paper is to evaluate the serviceability of two-way hollow core slab with the distinguishingly donut shaped hollow named as GB-SLABTM(Green Ball based lightweight biaxial concrete SLAB) developed by Samsung and patented internationally. One of engineering issues in the long-span concrete slab structure is definitely how to evaluate the long-term deflection considering the cracked section. To evaluate the long-term deflection of GB-SLAB, the immediate deflection after concrete form removal is measured and then the long-term cracked deflection is predicted using finite element analysis

Recently, an interest in volcanic eruption of the Mt. Baekdu is increasing. If the Mt. Baekdu has volcanic eruption, volcanic ash and earthquake will occur. These can give moderate or severe damages to the structure. But the studies of volcanic earthquake and structural damage by volcanic earthquake is not enough. In this paper, structural damages by volcanic earthquake were investigated and analyzed in connection with VEI-Magnitude and Distance-Magnitude relationships.

In this paper, the utilization of PZT’s dual piezoelectric effects (i.e., dynamic strain and electro-mechanical (E/M) impedance responses) for damage detection in beam-type structures are presented. In order to achieve the objective, the following approaches are implemented. First, global vibration-based and local impedance-based methods to detect the location of damage are presented. Then, the vibration-based and impedance-based damage detection methods using the dual piezoelectric responses are evaluated from experiments on a lab-scaled beam.

평창유역의 적설량을 모의하기 위하여 HSPF 모형을 적용하였다. 미래 적설량을 평가하기 위해 CIMIP3에서 제공하는 A1, A1B, B1의 온실가스 배출시나리오에 기반한 GCMs를 이용하였으며, HSPF 모형과 GCMs의 통계학적 오류를 최소화하기 위해 편의보정(Bias-correction)과 시간적 분해모형(Temporal disaggregation)을 적용하였다. 모형의 검·보정 결과 모의된 유출량과 적설량의 경우 모형 효율이 높게 나타났으며, 특히 모형의 검정 후 상관계수를 분석한 결과 월별 유출량의 상관계수는 0.94로 나타났다. 월별 적설량, 또한, 상관계수가 0.91로 나타나 보정된 HSPF 모형이 평창지역에 대한 유출량과 적설량을 잘 모의하고 있는 것으로 판단된다. GCMs를 이용한 2018년 평창올림픽 경기장의 적설량을 분석한 결과 1월에는 17.62%, 2월에는 9.38%, 3월에는 7.25%의 적설량이 감소되는 것으로 나타났다.

The purpose of this study is to investigate the business performance determinants of private consulting firms supporting bottom-up local development projects in rural areas. Under the shortage of well-trained rural development professionals, Private consulting firms support rural development projects driven by the residents. Considering the important role for consulting firms to play in the success in rural development projects, it becomes necessary to review the circumstances of consulting market on rural development projects. This study targeted 80 companies that are listed in the book rural development consulting firms. Analysis showed that factors influencing the business performance are not professional competencies but other external factors. The implications based on the above results need to be considered for policy-making to ensure that consulting company selection must be guaranteed of the consulting firms'capability by detailed fields of consulting firms' capability, and the training system for rural development experts must be formed.

Of the 6 most abundantly recognized Greenhouse Gases, SF6 (Sulfur Hexafluoride) is one of the most potentially consequential gases to Global Warming. The permeation characteristics of fluorinated gases N2 and SF6 used in the semiconductor processes were examined by study through the processes that occur during the Hollow Fiber Membrane Separation Technology. The developed module had a permeance of 8.83 ~ 17.40 GPU for N2 with N2/SF6 selectivity of 8.64 ~ 40.80 at various pressure and temperature. The SF6 isolation results showed the variables increased SF6 concentration levels of 13% ~ 63%, with a yield increase of 50% ~ 96%. These results are proven to be well utilized in the semiconductor manufacturing processes in the recovery of SF6 through the Hollow Fiber Membrane Separation Technology.

The purpose of this study is to investigate industry-wise employment growth factors in rural areas. Regional economic vitalization is sensitive to internal and external interaction changes among various industrial and occupational sectors. Thus, rural regional economic vitalization requires a comprehensive approach in analyzing industry-dependent employment structures and growth factors in rural areas. However, research conducted thus far has mostly focused on agriculture and farmers. Considering the evidence that rural communities continue to be stagnant and 80% of the rural population is engaged in nonagricultural activities, it becomes necessary to review industry-specific employment change factors in rural areas. This study targeted 5 counties in Chungnam. The results revealed that agriculture, forestry, and fisheries occupied the foremost positions with regard to population employed and regional GRDP share. The influence of national growth on employment and business variation effects was as high as 98.1% and 78.6%, respectively, thus demonstrating the high likelihood of rural economy to be influenced by external factors. Growth in the public sector appeared to support employment structure. Moreover, wholesale and retail businesses, constituting 14.4% of employment in rural areas, showed a strong trend toward degeneration, to the extent that difficulties have been forecasted for the supply of goods and services essential for basic livelihood of the rural residents. The implications based on the above observations need to be considered for policy-making to ensure that industrial structure is modified on the basis of internal demand of the region, and support for small businesses is integrated in rural area development projects.

브랜드 노출의 다양한 상황에서 브랜드 시각요소에 대한 연구는 것은 마케터나 디자이너에게 매우 실질적이고 실행에 단서를 제공할 수 있다. 최근 브랜드 연구의 다양한 확산에 따라 브랜드의 시각요소에 대한 연구 브랜드 시각요소의 디자인 특성에 따른 디자인 반응연구인, Schechter의 연구, Henderson & Cote의 연구, Henderson & Cote, Leong & Schmitt의 연구, 한상만 & 최주리의 연구 내용의 분석을 하였다. 각 연구에서 도출 된 반응차원과 연구 의 성과에 대한 분석으로 디자인 제작 시 반영 가능성을 모색하였다.

최근 전세계는 급격한 기후조건과 환경변화에 의해 냉난방 에너지 사용이 증가되고 있으며 이는 화석 연료 사용량 증가와 함께 CO2 배출량 상승, 지구 온난화 등 환경과 에너지에 대한 수많은 문제를 유발하고 있어 세계 각국은 온실가스 배출 및 에너지 소비 감소를 위한 대응책을 마련하고 있다. 우리나라 또한 정부의 '저탄소 녹색 성장' 및 '친환경 주택 건설기준 및 성능' 등의 정책을 선포하는 등 건물 부분에 있어 환경과 에너지 관리에 대한 노력을 하고 있다. 우리나라의 총 에너지 소비량 중 건물 부문이 차지하는 비율은 약 25%에 달하며 다른 산업 분야에 비해 연간 에너지 소비 증가율이 높은 편이다. 건물에서 에너지 손실이 가장 큰 부위는 외피로서, 이 부분의 에너지 손실을 감소하기 위한 연구가 활발히 진행되고 있으나 이는 대부분 창호 및 단열재를 사용한 연구이며 건물 외피의 70% 이상을 차지하고 있는 콘크리트에 대한 연구는 미미한 실정이다. 따라서 건물의 에너지 손실을 최소화하기 위해서는 콘크리트 자체에서 단열성능을 확보할 수 있어야 하며 이에 대한 연구가 필요하다. 따라서 본 연구는 콘크리트의 단열성능을 확보하면서 구조용으로 사용이 가능한 콘크리트를 개발하기 위한 실험을 진행하였다. Test 1의 실험결과로써, Micro Foam Admixture (MFA)를 사용한 콘크리트는 슬럼프 경시변화가 개선되었으며, MFA의 혼입율을 증가할 경우 압축강도는 감소되고 열전도율은 증가되는 결과를 나타내었다. Test 2의 실험결과에서는 물시멘트비 변화시 물시멘트비 증가에 따라 압축강도는 감소하였고 열전도율은 증가하였다. 그러나 잔골재율 변화에 대한 물성 및 열적 특성은 큰 차이를 나타내지 않았다.

Dried leaves of Raphanus sativus L. and Angelica keiskei L. extracts have strong antioxidant potential and in consequence profound effects on ulcerative colitis. Present study was conducted to explore the effect of diet mixtures containing dried leaves of Raphanus sativus and Angelica keiskei powder on ulcerative colitis in mice and antioxidant potential of radish green and Angelica extracts as well. Both dried leaves of Raphanus sativus and Angelica keiskei extracts exhibited higher antioxidant activity due to the presence of polyphenols, favonoids and antioxidant enzymes like superoxide dismutase (SOD). Analyzed data indicate that Angelica keiskei extract had higher polyphenol and flavonoid contents compared with radish green, while maximum SOD activity was noted in dried leaves of Raphanus sativus extract Likewise, higher antioxidant (348.72 ± 31.65 μg/mL) and ABTS+ radical scavenging (17%) activities were noted in dried leaves of Raphanus sativus extract compared with Angelica keiskei.

This paper presents a sensitivity optimization of a MEMS (microelectromechanical systems) gyroscope for a magnet-gyro system. The magnet-gyro system, which is a guidance system for a AGV (automatic or automated guided vehicle), uses a magnet positioning system and a yaw gyroscope. The magnet positioning system measures magnetism of a cylindrical magnet embedded on the floor, and AGV is guided by the motion direction angle calculated with the measured magnetism. If the magnet positioning system does not measure the magnetism, the AGV is guided by using angular velocity measured with the gyroscope. The gyroscope used for the magnet-gyro system is usually MEMS type. Because the MEMS gyroscope is made from the process technology in semiconductor device fabrication, it has small size, low-power and low price. However, the MEMS gyroscope has drift phenomenon caused by noise and calculation error. Precision ADC (analog to digital converter) and accurate sensitivity are needed to minimize the drift phenomenon. Therefore, this paper proposes the method of the sensitivity optimization of the MEMS gyroscope using DEAS (dynamic encoding algorithm for searches). For experiment, we used the AGV mounted with a laser navigation system which is able to measure accurate position of the AGV and compared result by the sensitivity value calculated by the proposed method with result by the sensitivity in specification of the MEMS gyroscope. In experimental results, we verified that the sensitivity value through the proposed method can calculate more accurate motion direction angle of the AGV.

This research was performed to evaluate the recycling characteristics by physico-chemical analysis of wasted and regenerated activated carbons. Three types of waste carbons for gas treatment, drinking water purification, and wastewater treatment were sampled and analyzed. Heavy metals concentrations of As, Zn, Pb and Cd for all regenerated carbons satisfied the standard criteria of the granular activated carbon for drinking water purification. The sieve residues of the regenerated activated carbons for drinking water purification and wastewater treatment were in the range of 85.3 ~ 97.7% and 97.7 ~ 99.7%, respectively. Some samples of the regenerated activated carbons were not able to satisfy the standard criteria for methylene blue adsorption ( 150 mL/g) and iodine adsorption ( 950 mg/g). All activated carbons for gas treatment and drinking water purification satisfied the standard criteria for hardness and bulk density. One of three activated carbon samples for drinking water purification did not satisfied the standard criteria for phenol number and ABS (alkyl benzene sulfonate) number. The observed results concluded that there was no problem of heavy metals accumulation in the regenerated activated carbon, but partially against standard criteria such as sieve residue, moisture content, methylene blue adsorption, and iodine adsorption.

This study was carried out to develop pilot plant Net3FM(Net Fit Fiber Filter Module) system and to suggest optimum operating condition for municipal wastewater reuse. SS concentration of biologically treated sewage effluent was reduced from 1.5~5.4mg/L to 0.4~1.0mg/L without coagulant injection in Net3FM system, and the SS removal efficiency was average 84.7%. And also, the removal efficiencies of COD and T-P were decreased slightly due to the SS removal by filtration. Coagulation-Filtration test was conducted to enhance the removal efficiencies of SS and T-P. The optimum dosage of coagulant was injected automatically by auto-controlling system, which is controlled by detecting value of turbidity of secondary sewage effluent. SS, COD and T-P concentrations in filtrated effluent were 0.21~0.57, 1.6~6.2 and 0.137~0.392mg/L with coagulant injection by in-line mixer in Net3FM system, respectively. The removal efficiencies of SS and T-P were highly increased to 92.8% and 89.8%, respectively. It was due to the combined the processes of coagulation and filtration. Net3FM system was evaluated that the removal efficiency of pollutants in secondary sewage effluent and the utilization potential as reclaimed water technology were very high.

이 연구는 연계성, 적합성, 희생으로 구성되는 직무배태성이 조직몰입을 통해 선원의 이직의사에 어떤 영향을 미치는가를 실증적으로 검증하는 것을 목적으로 한다. 선원 362명으로부터 수집한 설문자료를 공분산구조분석 방법으로 분석한 결과는 다음과 같다. 첫째, 직무 배태성이 높을수록 선원의 조직몰입이 높아진다. 둘째, 직무 배태성 중 연계성과 적합성이 이직의사에 직접적인 부(-)의 영향을 미침으로써 조직몰입은 선원의 이직의사에 한계적 수준에서 부(-)의 영향을 가진다 등이며, 이러한 연구결과는 이론적 측면에서 뿐만 아니라, 실무적으로 선원의 이직을 감소시키기 위한 방안으로서 기존의 방법들 외에 집단 및 조직에 대한 선원의 연계성이나 선원의 직무 및 조직 적합도를 제고하는 것이 중요하다는 것을 확인하였다는 것에 연구의 시사점이 있다.

본 연구는 육성된 품종을 이용하여 초밥에 적합한 품종 선발하고 그 특성을 파악하여 향후 초밥에 적합한 품종을 육종하기 위한 선발지표를 탐색하기위해 국내 육성품종에 대해 초밥조리전문가들이 초밥 적성을 평가하도록 하여 초밥 적합 품종을 선발하였고, 이 품종들의 이화학적 특성과 호화특성을 조사하였다. 호품, 신동진이 초밥의 전체적인 외관 및 밥맛 비교에서 다른 국내 육성품종에 비해 우수하였고 초밥적성 품종으로 알려진 고시히까리와 차이가 없었다. 호화특성에서 강하점도(Breakdown)는 신동진, 호품, 고시히까리가 높았고, 치반점도(Setback)는 주안, 신동진, 호품이 고시히까리와 비슷한 음의 값을 보여 공시재료의 전체적인 호화특성은 신동진, 호품이 고시히까리와 비슷한 특성을 나타내었다. 이와 같이 호품과 신동진이 초밥용 외관 및 맛 선호도, 호화특성이 다른 품종에 비해 우수한 특성을 나타내어 초밥에 적합한 품종으로의 활용이 기대된다. 초밥조리전문가 31명에 의한 7개 품종의 초밥 적합성 평가와 쌀 및 밥의 이화학적 특성 호화특성과의 상관분석을 실시한 결과, 초밥 적합성과 호화특성 간에 유의한 상관성이 인정되었다. 호화특성 중 최고점도, 강하점도는 초밥적합성과 정의 상관을, 치반점도는 부의 상관을 나타내었다. 따라서 호화특성은 초밥에 적합한 품종선발을 위한 선발지표로 활용될 수 있을 것으로 판단된다.