• 제목/요약/키워드: Technical Performance

검색결과 2,976건 처리시간 0.029초

고속 쌍동형 낚시 레저보트 선형개발과 저항성능에 관한 연구 (Study of Hull Form Development and Resistance Performance of Catamaran-type High Speed Fishing Leisure Boat)

  • 정우철;권수연;최지훈;김도정;홍기섭
    • 한국해양공학회지
    • /
    • 제27권6호
    • /
    • pp.1-6
    • /
    • 2013
  • A 25ft class fishing leisure boat is developed, and the resistance performances are investigated by a model test in a high-speed circulating water channel. The design speed of the developed ship is 25 knots using a 150 ps outboard engine. A catamanan type hull form using a planing section is adopted considering the Froude number and large deck area. The effect of a center body attached on the bottom of the cross deck is studied under various conditions. Wave patterns are observed to make clear the relationship between the resistance performance and the wave characteristics. The results show that the shape of the center body and the position of the chine line can have a strong effect on the resistance performance in a certain velocity range.

전기추진 선박에 적용되는 20HP급 전기추진 선외기 구동시스템의 성능평가에 대한 고찰 (Performance Evaluation of 20 HP Outboard Motor in Consideration of Driving System Applied to Electric-Propulsion Boat)

  • 문병영;신국환;이기열
    • 한국해양공학회지
    • /
    • 제32권6호
    • /
    • pp.518-526
    • /
    • 2018
  • As a new technical approach, this paper introduces a method for improving an electrically propelled outboard motor in consideration of the driving system applied to an electric-propulsion boat with solar cell energy. The most efficient model for a drive shaft, propeller shaft, and bevel gear was suggested and examined with respect to the results of test operation in prototype mode. Furthermore, this research included a performance evaluation of the manufactured prototype to acquire the purposed quantity value and the development items. After manufacturing the desired prototype of an electrically propelled outboard motor, the maximum sail time, thrust force, noise, and weight were evaluated in a performance test. An additional test in relation to the maximum sail speed (knots) of the completed prototype was conducted using a sea trial evaluation to acquire the optimum quantity.

물류기업의 RFID 도입 요인과 물류성과의 관계 연구 (A Study on RFID Adoption and Logistics Performance in Logistics Company)

  • 김영민;우정욱
    • 한국항만경제학회지
    • /
    • 제29권4호
    • /
    • pp.135-155
    • /
    • 2013
  • 물류분야에서 RFID 기술의 응용이 확산되면서 RFID 도입 요인과 물류성과와의 관계를 분석할 필요가 있다. 기존 여러 분야의 선행연구를 통하여 RFID 도입이나 채택에 영향을 미치는 요인을 도출하고, 물류기업을 대상으로 이러한 요인이 물류성과에 미치는 영향을 실증적으로 분석하고, 그에 대한 시사점을 제시하고자 하였다. 관련 선행연구에서 물류기업이 RFID를 도입하는데 있어 CEO 지원, 기술 우위성, 거래 파트너, 상호 양립성 및 상대적 이익과 같은 요인이 물류성과에 영향을 미치는 것으로 나타났다. SCM, 물류 및 유통, 제조분야를 대상으로 한 선행연구를 기초로 연구모형 및 가설을 설정하고, 물류기업 종사자를 대상으로 RFID 도입 요인이 물류성과에 어떠한 영향을 미치는지 설문조사를 실시하였으며, 탐색적 요인분석, 신뢰성 분석, 확인적 요인분석 및 구조방정식모형 분석을 통해 가설을 검증하였다. 연구 결과, CEO 지원과 거래 파트너의 RFID 도입 요인은 물류성과에 유의한 정(+)의 영향을 미쳤으며, 상호 양립성과 상대적 이익은 유의한 영향을 미치지 못하였다. 기술 우위성은 물류성과에 통계적으로 유의한 영향을 미치지 못하는 것으로 나타났으나 p=0.052라는 것을 고려할 때, 물류성과에 유의한 영향을 미칠 수 있을 것으로 사료되며, 유의수준 0.1에서는 유의한 영향을 미치는 것으로 나타났다.

Assessment of compressive strength of high-performance concrete using soft computing approaches

  • Chukwuemeka Daniel;Jitendra Khatti;Kamaldeep Singh Grover
    • Computers and Concrete
    • /
    • 제33권1호
    • /
    • pp.55-75
    • /
    • 2024
  • The present study introduces an optimum performance soft computing model for predicting the compressive strength of high-performance concrete (HPC) by comparing models based on conventional (kernel-based, covariance function-based, and tree-based), advanced machine (least square support vector machine-LSSVM and minimax probability machine regressor-MPMR), and deep (artificial neural network-ANN) learning approaches using a common database for the first time. A compressive strength database, having results of 1030 concrete samples, has been compiled from the literature and preprocessed. For the purpose of training, testing, and validation of soft computing models, 803, 101, and 101 data points have been selected arbitrarily from preprocessed data points, i.e., 1005. Thirteen performance metrics, including three new metrics, i.e., a20-index, index of agreement, and index of scatter, have been implemented for each model. The performance comparison reveals that the SVM (kernel-based), ET (tree-based), MPMR (advanced), and ANN (deep) models have achieved higher performance in predicting the compressive strength of HPC. From the overall analysis of performance, accuracy, Taylor plot, accuracy metric, regression error characteristics curve, Anderson-Darling, Wilcoxon, Uncertainty, and reliability, it has been observed that model CS4 based on the ensemble tree has been recognized as an optimum performance model with higher performance, i.e., a correlation coefficient of 0.9352, root mean square error of 5.76 MPa, and mean absolute error of 4.1069 MPa. The present study also reveals that multicollinearity affects the prediction accuracy of Gaussian process regression, decision tree, multilinear regression, and adaptive boosting regressor models, novel research in compressive strength prediction of HPC. The cosine sensitivity analysis reveals that the prediction of compressive strength of HPC is highly affected by cement content, fine aggregate, coarse aggregate, and water content.

기술혁신 역량이 경영성과에 미치는 영향 - 기술사업화 역량의 조절효과를 중심으로 - (The impact of technological innovation capacity on business performance - Focusing on the moderating effect of technical commercialization capacity -)

  • 신성욱
    • 경영과정보연구
    • /
    • 제38권1호
    • /
    • pp.225-239
    • /
    • 2019
  • 기술혁신을 통해 기업이 성장하기 위해서는 기술혁신을 뒷받침해주는 기술혁신 역량이 무엇보다 중요하다. 또한 단순히 기술혁신의 성공을 넘어 경영성과의 향상으로 이어지기 위해서는 기술사업화 과정도 무시될 수 없는 중요한 요소이다. 이런 맥락에서 본 연구에서는 기업의 기술혁신 역량이 경영성과에 미치는 영향을 분석해 보고, 기술혁신 역량이 경영성과에 미치는 영향에 기술사업화 역량이 조절효과를 가지는 지를 분석해 보고자 하였다. 상기의 목적을 분석하기 위해 동남권 소재 중소 벤처기업을 대상으로 설문조사를 통해 자료를 수집하였고, 수집된 132부의 기업 설문자료를 바탕으로 다중회귀분석을 통해 실증 분석한 결과를 요약하면 다음과 같다. 첫째, 기술혁신 역량이 높을수록 경영성과가 더욱 높은 것으로 나타났다. 구체적으로 R&D 투자역량, 기술축적 역량, 기술혁신 체계가 잘 갖추어진 기업의 경우 경영성과(시장경쟁력, 사업성장성 및 사업수익성)가 더욱 높은 것으로 나타났다. 둘째, 기술혁신 역량이 경영성과에 미치는 영향에 기술사업화 역량이 조절효과를 가지는 지를 분석한 결과 기술사업화 역량은 기술혁신 역량이 경영성과에 미치는 영향에 정(+)의 조절효과를 가지는 것으로 분석되었다. 이는 기업이 보유하고 있는 기술혁신 역량이 높을수록 기술혁신의 성공으로 경영성과에 긍정적인 영향을 미친다는 것을 의미하고, 기술사업화 역량까지 잘 갖추고 있는 기업의 경우 개발된 기술의 사업화 과정을 성공적으로 수행하여 경영성과가 더욱 높아진다는 것을 나타내는 결과라 할 수 있다. 본 연구의 결과는 기업이 기술적 혁신을 통해 성과를 창출하기 위해서는 기술혁신에 필요한 역량과 사업화 역량을 체계적으로 구축하는 운영하는 것이 무엇보다 중요하다는 것을 의미한다 하겠다.

공동주택 토목공사의 책임기술자와 품질의 상관관계 분석 (Correlation analysis of the quality and civil construction engineer in apartment house)

  • 정상훈
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2015년도 추계 학술논문 발표대회
    • /
    • pp.70-71
    • /
    • 2015
  • Construction period is longer than the non-disclosure in civil construction of apartment house. And this process is intensive at the beginning and end of construction. Because this project management expertise is required. Nevertheless, subsidiary work(Working avoid a tendency of advanced technician, Frequent turnover and employment contracts, etc.) management attention of construction is at a lower level. Because of, there are the bad factors(trial and error, finish degradation, etc.). Therefore, this study analyzed Hindrance Factor of quality control on apartment complex construction work and presented importance of civil construction engineer's role. Also, forms of civil construction engineer, Performance experience and technical Strength of apartment complex construction was investigated for the construction. To this end, It analyzes the relationship between forms of civil construction engineer, Performance experience and technical Strength of apartment complex construction and Construction of evaluation as required by Construction Technology Management Act.

  • PDF

A teaching learning based optimization for truss structures with frequency constraints

  • Dede, Tayfun;Togan, Vedat
    • Structural Engineering and Mechanics
    • /
    • 제53권4호
    • /
    • pp.833-845
    • /
    • 2015
  • Natural frequencies of the structural systems should be far away from the excitation frequency in order to avoid or reduce the destructive effects of dynamic loads on structures. To accomplish this goal, a structural optimization on size and shape has been performed considering frequency constraints. Such an optimization problem has highly nonlinear property. Thus, the quality of the solution is not independent of the optimization technique to be applied. This study presents the performance evaluation of the recently proposed meta-heuristic algorithm called Teaching Learning Based Optimization (TLBO) as an optimization engine in the weight optimization of the truss structures under frequency constraints. Some examples regarding the optimization of trusses on shape and size with frequency constraints are solved. Also, the results obtained are tabulated for comparison. The results demonstrated that the performance of the TLBO is satisfactory. Additionally, TLBO is better than other methods in some cases.

자이로의 신뢰성 예측모델에 관한 연구 (A Study on The Feliability Predication Model of Gyroscope)

  • 백순흠;문홍기;김호룡
    • 한국정밀공학회:학술대회논문집
    • /
    • 한국정밀공학회 1993년도 추계학술대회 논문집
    • /
    • pp.475-481
    • /
    • 1993
  • The objective of this study is to develope the reliability prediction model for Float Rated Integrating Gyroscope( :FRIG) at maximum loading. The equation of motion for FRIG is firstly derived to set up the reliability prediction model. To analysis reliability or all parts of the gyro is not easy due to their complicated structure. Therefore the failure parts are chosen by Failure Mode Effective Analysis (:FMEA). F.E.M is utilized to calculate loads for the selseced rotating assembly and pivot / jewel. The technical reliability is calculated by applying reliability design theory with these results and the performance reliability is sought through distribution estimation with error test data. The bulk reliability of gyroscope is sought by applying the two results. The present prediction results are compared with the accumulation time in good agreement.

  • PDF

제지공정의 무방류화를 위한 보류시스템 탐색 (Exploration of retention system for papermaking system closure)

  • 이학래;함충현;이지영;황남선;이상길;김종민
    • 펄프종이기술
    • /
    • 제33권2호
    • /
    • pp.1-7
    • /
    • 2001
  • Use of high yield pulp and recycled fiber as raw materials and water system closure result in higher fines content and buildup of organic and inorganic contaminants in white water. These are detrimental for the effectiveness of chemical additives including retention aids. Thus it is imperative to employ a retention systems that maintains its efficiency in closed papermaking system for reducing fresh water consumption. The performance of four different microparticle retention systems including cationic polyacrylamide (C-PAM)/bentonite, highly charged cationic starch (HCS)/silica, C-PAM/micropolymer, cationic guar gum (CGG)/silica was evaluated and compared at three different levels of papermaking system closure. Buildup of detrimental substances in a closed white water system increased cationic demand and finally reduced the performance of retention systems. Cationic starch and guar gums maintained their effectiveness in retention in closed white water systems contaminated with anionic trashes because of their structural rigidity and hydrogen bonding ability. Particularly, cationic guar gums, due its stiffness of molecular structure, appeared perform better than catinonic starch.

  • PDF

On Modification and Application of the Artificial Bee Colony Algorithm

  • Ye, Zhanxiang;Zhu, Min;Wang, Jin
    • Journal of Information Processing Systems
    • /
    • 제14권2호
    • /
    • pp.448-454
    • /
    • 2018
  • Artificial bee colony (ABC) algorithm has attracted significant interests recently for solving the multivariate optimization problem. However, it still faces insufficiency of slow convergence speed and poor local search ability. Therefore, in this paper, a modified ABC algorithm with bees' number reallocation and new search equation is proposed to tackle this drawback. In particular, to enhance solution accuracy, more bees in the population are assigned to execute local searches around food sources. Moreover, elite vectors are adopted to guide the bees, with which the algorithm could converge to the potential global optimal position rapidly. A series of classical benchmark functions for frequency-modulated sound waves are adopted to validate the performance of the modified ABC algorithm. Experimental results are provided to show the significant performance improvement of our proposed algorithm over the traditional version.