• 제목/요약/키워드: level design

검색결과 13,006건 처리시간 0.044초

Deep learning method for compressive strength prediction for lightweight concrete

  • Yaser A. Nanehkaran;Mohammad Azarafza;Tolga Pusatli;Masoud Hajialilue Bonab;Arash Esmatkhah Irani;Mehdi Kouhdarag;Junde Chen;Reza Derakhshani
    • Computers and Concrete
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    • 제32권3호
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    • pp.327-337
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    • 2023
  • Concrete is the most widely used building material, with various types including high- and ultra-high-strength, reinforced, normal, and lightweight concretes. However, accurately predicting concrete properties is challenging due to the geotechnical design code's requirement for specific characteristics. To overcome this issue, researchers have turned to new technologies like machine learning to develop proper methodologies for concrete specification. In this study, we propose a highly accurate deep learning-based predictive model to investigate the compressive strength (UCS) of lightweight concrete with natural aggregates (pumice). Our model was implemented on a database containing 249 experimental records and revealed that water, cement, water-cement ratio, fine-coarse aggregate, aggregate substitution rate, fine aggregate replacement, and superplasticizer are the most influential covariates on UCS. To validate our model, we trained and tested it on random subsets of the database, and its performance was evaluated using a confusion matrix and receiver operating characteristic (ROC) overall accuracy. The proposed model was compared with widely known machine learning methods such as MLP, SVM, and DT classifiers to assess its capability. In addition, the model was tested on 25 laboratory UCS tests to evaluate its predictability. Our findings showed that the proposed model achieved the highest accuracy (accuracy=0.97, precision=0.97) and the lowest error rate with a high learning rate (R2=0.914), as confirmed by ROC (AUC=0.971), which is higher than other classifiers. Therefore, the proposed method demonstrates a high level of performance and capability for UCS predictions.

Shoe Recommendation System by Measurement of Foot Shape Imag

  • Chang Bae Moon;Byeong Man Kim;Young-Jin Kim
    • 한국컴퓨터정보학회논문지
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    • 제28권9호
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    • pp.93-104
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    • 2023
  • 현대 사회의 서비스 방식은 대면 방식보다 비대면 방식을 선호하는 추세이다. 하지만 신발과 같이 상품을 추천하는 서비스는 대면 방식의 서비스가 불가피하다. 본 논문에서는 비대면 서비스를 목적으로 자동으로 발의 사이즈를 측정하고, 측정 결과를 기반으로 신발을 추천하는 시스템을 제안한다. 제안방법의 성능을 분석하기 위해 사이즈 측정 오차율과 추천성능을 분석하였다. 추천성능 실험에 사용한 방법은 총 10가지이고, 이의 방법 중 가장 좋은 성능을 보이는 추천 방법을 시스템에 적용하였다. 오차율에 대한 실험결과, 사이즈 관련 오차가 작음을 알 수 있었고, 추천성능에 대한 실험결과, 추천에 대한 유의한 결과를 도출할 수 있었다. 본 논문에서의 제안방법은 실험실 수준으로 향후 실제 환경으로 확대 적용할 필요가 있다.

그룹 활동 프로그램이 만성 뇌졸중 환자의 사회적 상호작용과 활동 수행 만족도에 미치는 영향 (Effects of Group Programs on Social Interaction and Satisfaction of Performance Activities in Chronic Stroke)

  • 최지현;박아름
    • 한국엔터테인먼트산업학회논문지
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    • 제13권8호
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    • pp.573-581
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    • 2019
  • 본 연구는 그룹 활동 프로그램이 지역사회에 거주하는 만성 뇌졸중 환자의 사회적 상호작용과 활동 수행 만족도에 미치는 영향을 알아보고자 하였다. 지역사회에 거주하는 만성뇌졸중 환자 8명을 대상으로 주 1회 60분씩 40주 동안 그룹작업치료를 진행하였으며, 프로그램은 구성원들 간의 상호작용을 유도하는 대근육, 소근육, 인지활동으로 구성되었다. 결과 측정은 사회적 상호작용 불안척도(SIAS)과 캐나다작업수행(COPM)을 사용하여 평가를 실시하였으며, 중재 후 프로그램 만족도를 조사하였다. 그룹 활동 후 대상자들의 사회적 상호작용 불안정도는 통계학적으로 유의한 감소가 확인되었으며, 활동 수행 능력에서 통계학적으로 유의한 향상이 확인되었다. 또한 대상자 모두 중재 이후 프로그램에 대한 긍정적인 만족도를 보였다. 지역사회에 거주하는 만성뇌졸중 환자에게 지역사회에서 제공하는 그룹 활동 프로그램은 지역사회 구성원들과 상호작용을 수행하며, 대상자들의 과제 수행력을 높여 의미 있는 삶을 구상함에 긍정적인 접근이라는 것을 알 수 있었다.

Effect of wild ginseng on the laying performance, egg quality, cytokine expression, ginsenoside concentration, and microflora quantity of laying hens

  • Habeeb Tajudeen;JunYoung Mun;SangHun Ha;Abdolreza Hosseindoust;SuHyup Lee;JinSoo Kim
    • Journal of Animal Science and Technology
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    • 제65권2호
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    • pp.351-364
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    • 2023
  • The experiment was carried out to study the effect of Korean wild ginseng adventitious root supplementation on the laying performance, egg quality, cytokine expression, ginsenoside concentration, and microflora quantity of Institut de selection Animale (ISA) brown laying hens at 24 weeks old. A total of 90 laying hens were subjected to a completely randomized design at three treatments, five repetitions and six laying hens per replicate. The experiments were divided by diets into the basic feed (CON), basic feed + 0.1% wild ginseng (WG1), and basic feed + 0.5% wild ginseng (WG2). The feeding trial was carried out over a duration of 12 weeks after an initial acclimation period of 2 weeks. Feeds and water were administered ad libitum in mash form, and light was available for 16 hours per day. At the end of study, henday egg production (HDEP), average egg weight (AEW), and egg mass (EM) were increased (p <0.05) in WG2 at week 12. Feed conversion ratio (FCR) was decreased (p < 0.05) in WG2 at week 12. The ginsenoside content in egg yolk was increased (p <0.05) in laying hens in the WG2 treatment at week 12. Relative expression of tumor necrosis factor alpha (TNF-α) was reduced (p < 0.05) in the WG supplemented diets at week 12. The fecal microflora quantity of Lactobacillus was increased (p < 0.05) in WG2 at week 8 to week 12, and Escherichia coli (E. coli) was significantly decreased (p < 0.05) in the WG2 at week 12. We concluded that the result observed in the HDEP, AEW, EM and FCR was due to an increase in ginsenoside content, leading to an improvement in the TNF-α, and fecal microflora quantity such as Lactobacillus and E. coli in the WG2 supplemented diets. We therefore recommend the use of WG at application level 0.5% per basal diet for optimum laying performance in layer hens.

Effect of supplementary feeding on the production traits, carcass and meat quality of Jamuna basin lambs

  • Md. Anwar Hossain;Md. Mukhlesur Rahman;Md. Wakilur Rahman;Md. Mujaffar Hossain;Md. Abul Hashem
    • Journal of Animal Science and Technology
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    • 제65권1호
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    • pp.209-224
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    • 2023
  • This study aimed to identify the optimum level of supplementary feeds on the carcass traits and meat quality of Jamuna basin lambs. Forty selected lambs were divided into four treatments such as T0 (no concentrate supplementation), T1 (1% concentrate feed), T2 (1.5% concentrate feed) and T3 (2% concentrate feed) having ten lambs per treatment. The data were analyzed through Completely Randomized Design (CRD) with SAS software. Hot carcass, dressing percentage, head, leg, neck, loin, heart, and spleen weight were showed significantly (p < 0.05) higher values with increasing concentrate feed. The crude protein (CP), ether extract (EE) and ash values were significantly increased (p < 0.001) except T2 treatment. The ultimate pH was significantly increased except T2 and cooked pH was significantly decreased (p < 0.001) except T3 treatment. Drip loss and cooking loss (CL) % had significantly reduced (p < 0.001) except T3 treatment. The water holding capacity (WHC) % was significantly increased (p < 0.001) except T3 treatment. The score of color, juiciness and tenderness were significantly different (p < 0.001). Flavor and overall acceptability score were significantly increased (p < 0.05) in different treatments. The color values L* and b* had significantly changed (p < 0.001) and a* value was found significantly higher (p < 0.05) in all treatments. Hence, 12 months of aged lambs with 1.5% concentrate feed showed better performances on carcass, nutritional, physicochemical, sensory and instrumental color values to increase the carcass and the meat quality of lambs.

복식호흡이 조기진통 임부의 불안에 미치는 효과 (Effects of Abdominal Breathing on Preterm Labor Anxiety)

  • 심정언;장순복
    • 여성건강간호학회지
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    • 제12권2호
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    • pp.106-114
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    • 2006
  • Purpose: The purpose of this study was to explore the effects of abdominal breathing on relieving anxiety in women diagnosed with preterm labor. Method: This was a pilot study, which was based on a repeated pre-post experiment design without a control group. Seven patients with preterm labor who were admitted to Y university medical center, Seoul, Korea, participated in the experiment. They were under receiving ritodrine hydrochloride(Yutopa) as tocolytic therapy and did not have any other complications. The patients were taught abdominal breathing, which is a modified version of Mason's breathing technique. The experimental treatments were done 33 times from February 18 to June 19 in 2005. Result: After abdominal breathing, the average psychological anxiety level decreased significantly. The physical anxiety levels of preterm labor patients were measured by blood pressure, pulse, and skin temperature. After abdominal breathing, the average systolic and diastolic blood pressure decreased from 117.3mmHg to 107.6 mmHg (z=-3.85, p<.001) and from 67.3mmHg to 62.7 mmHg (z=-3.14, p<.005), respectively. The average pulse rate also decreased from 97.2/min to 89.8/mim (z=-4.76, p<.001). The average skin temperature increased from 94.0 to 94.9(z=-4.80. p<.001). Conclusion: Abdominal breathing is effective for relieving anxiety of women diagnosed with preterm labor. This study, however, has been limited to short-term effects, and therefore further studies are required in order to examine the long-term effects of abdominal breathing.

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The Impact of An Interaction between Product Quality and Perceived Risk on Seller Profit

  • Seung HUH
    • 융합경영연구
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    • 제11권2호
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    • pp.23-32
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    • 2023
  • Purpose: This study examines the effect of full information disclosure on seller profit when there exists information asymmetry between sellers and buyers, focusing on the risk averseness of buyers. By investigating the interaction between product quality and perceived risk through online sales data, we attempt to figure out the incentive structure of full information disclosure specifically when buyers are risk-averse, so that we can suggest more feasible information disclosure strategy to sellers. Research design, data and methodology: Our empirical model analyzes the sales data of collectible goods from a major online seller using Poisson regression. In our model, we have specifically considered risk-averseness of buyers by estimating the interaction effect between the product quality and perceived risk on seller profit, aiming for a more precise empirical analysis on sellers' incentive structure of full disclosure. Results: Our empirical analysis strongly supports the effect of interaction between product quality and perceived risk, showing that the incentive for full disclosure is much stronger when product quality is higher, and vice versa. Therefore, sellers are strongly encouraged to voluntarily reveal product weaknesses when their product quality is higher than average, while it is more profitable to hide any product defects when quality claim is lower than average. Conclusions: This study supports the related literature by confirming economic incentives for full disclosure, and also supplements and strengthens previous studies by presenting that the effect of interaction between product quality and perceived risk strongly affects seller profit. Our unique finding supports both mandatory disclosure and voluntary disclosure arguments and presents practical implications to marketing managers by suggesting that seller's incentive for revealing weaknesses depends on the level of seller's product quality.

실내 모형토조실험에 의한 손상도별 수평배수공 유출량 측정을 통한 배수성능 평가 기준 제안 (A Study on the Evaluation Criteria of Drainage Performance by Measurement of Horizontal Drainage Flow Rate by Damage Degree by Interior Model Construction Experiment)

  • 최수환;이동혁;심정훈
    • 한국지반환경공학회 논문집
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    • 제24권1호
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    • pp.45-50
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    • 2023
  • 강우에 의한 비탈면 재해를 방지하기 위해서는 신속히 강우를 배제하는 것이 매우 중요하다. 국내에서는 지하수위를 낮추기 위한 방법으로 경제성과 시공성이 뛰어나고, 배수 성능이 좋은 수평배수공을 보편적으로 적용하고 있다. 그러나 현장에서 시공되는 수평배수공의 경우 다른 용수의 유무나 지반의 조건과 관계없이 획일적으로 시공되는 경우가 많으며, 유지관리가 원활하게 이루어지지 않고 있어 수평배수공의 배수 성능을 기대하기 힘든 경우가 많다. 이에 본 연구에서는 모형토조를 이용해 인공지반을 조성하여 수평배수공 실험을 수행하였다. 수평배수공 배수 면적을 일정량 통제해 통제면적 0%, 25%, 50%, 75% 상태의 수평배수공 유출량을 측정하였으며, 측정값과 설계 도서 등을 바탕으로 수평배수공을 정량적으로 평가할 수 있는 평가표(안)를 제안하여 현장적용이 가능한 기초자료로서 제안하고자 한다.

Experimental Assessment of Mesophilic and Thermophilic Batch Fermentative Biohydrogen Production from Palm Oil Mill Effluent Using Response Surface Methodology

  • Azam Akhbari;Shaliza Ibrahim;Low Chin Wen;Afifi Zainal;Noraziah Muda;Liyana Yahya;Onn Chiu Chuen;Farahin Mohd Jais;Mohamad Suffian bin Mohamad Annuar
    • Korean Chemical Engineering Research
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    • 제61권2호
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    • pp.278-286
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    • 2023
  • The present work evaluated the production of biohydrogen under mesophilic and thermophilic conditions through dark fermentation of palm oil mill effluent (POME) in batch mode using the design of experiment methodology. Response surface methodology (RSM) was applied to investigate the influence of the two significant parameters, POME concentration as substrate (5, 12.5, and 20 g/l), and volumetric substrate to inoculum ratio (1:1, 1:1.5, and 1:2, v/v.%), with inoculum concentration of 14.3 g VSS/l. All the experiments were analyzed at 37 ℃ and 55 ℃ at an incubation time of 24 h. The highest chemical oxygen demand (COD) removal, hydrogen content (H2%), and hydrogen yield (HY) at a substrate concentration of 12.5 g COD/l and S:I ratio of 1:1.5 in mesophilic and thermophilic conditions were obtained (27.3, 24.2%), (57.92, 66.24%), and (6.43, 12.27 ml H2/g CODrem), respectively. The results show that thermophilic temperature in terms of COD removal was more effective for higher COD concentrations than for lower concentrations. Optimum parameters projected by RSM with S:I ratio of 1:1.6 and POME concentration of 14.3 g COD/l showed higher results in both temperatures. It is recognized how RSM and optimization processes can predict and affect the process performance under different operational conditions.

SiO2/TiO2 혼합입자 슬러리 SiC CMP의 재료제거율 모델링 (Material Removal Rate Modeling of SiO2/TiO2 Mixed-Abrasive Slurry CMP for SiC)

  • 이현섭
    • Tribology and Lubricants
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    • 제39권2호
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    • pp.72-75
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    • 2023
  • Silicon carbide (SiC) is used as a substrate material for power semiconductors; however, SiC chemical mechanical polishing (CMP) requires considerable time owing to its chemical stability and high hardness. Therefore, researchers are attempting to increase the material removal rate (MRR) of SiC CMP using various methods. Mixed-abrasive CMP (MAS CMP) is one method of increasing the material removal efficiency of CMP by mixing two or more particles. The aim of this research is to study the mathematical modeling of the MRR of MAS CMP of SiC with SiO2 and TiO2 particles. With a total particle concentration of 32 wt, using 80-nm SiO2 particles and 25-nm TiO2 particles maximizes the MRR at 8 wt of the TiO2 particle concentration. In the case of 5 nm TiO2 particles, the MRR tends to increase with an increase in TiO2 concentration. In the case of particle size 10-25 nm TiO2, as the particle concentration increases, the MRR increases to a certain level and then decreases again. TiO2 particles of 25 nm or more continuously decreased MRR as the particle concentration increased. In the model proposed in this study, the MRR of MAS CMP of SiC increases linearly with changes in pressure and relative speed, which shows the same result as the Preston's equation. These results can contribute to the future design of MAS; however, the model needs to be verified and improved in future experiments.