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An efficient skyline framework for matchmaking applications
Han, H.,Jung, H.,Eom, H.,Yeom, H.Y. Academic Press 2011 JOURNAL OF NETWORK AND COMPUTER APPLICATIONS - Vol.34 No.1
In this article, we present a skyline-based matchmaking framework. The current method of carrying out the matchmaking procedure identifies items based on users' specifications. We rethink matchmaking procedures in such a way that they can find items that can satisfy a specific computing demand from a user and recommend a collection of better candidates among the identified items. This endows a user with the right of choice on deciding the best-possible items. We approach the recommendation from the perspective of skyline computation and present an efficient skyline algorithm that gathers interesting item candidates efficiently. To devise an efficient sequential skyline algorithm, we adopt (i) lattice-based indexing using a lattice composition technique and (ii) an optimized dominance-check algorithm. Moreover, we parallelize the algorithm using breadth-first-search (BFS). Our extensive experimental results show that our algorithm outperforms current state-of-the-art algorithms, and the speedup factor of the parallelized algorithm is near-linear.
Dispensing of rheologically complex fluids at the dripping regime
Han, H.,Kim, C. Elsevier Scientific Pub. Co 2014 Journal of non-Newtonian fluid mechanics Vol.213 No.-
Dispensing characteristics of rheologically complex fluids are investigated experimentally at the dripping regime. Two mixtures of ethylene glycol and glycerin (50:50 and 31:69) were used as base Newtonian fluids. As the polymer solution, 1000ppm of polyacrylamide of 5-6Mg/mol was added to the 50:50 base Newtonian fluid. 2.5, 5 or 7.5vol% of polystyrene particles of 2μm in diameter were added to the liquids to prepare particle suspensions. The liquids were dispensed to the air by using a nozzle with the inner and outer diameters of 0.61 and 0.91mm, respectively. It was found that the drop size is primarily determined by the balance of drop weight and surface tension force holding the drop, and hence drop size does not depend on volume flow rate. The drop diameter is approximately 10% smaller for elastic liquids due to the severe extension of the filament before the detachment from the nozzle. The result also shows that the dripping characteristics of the fluids without the polymer are mainly determined by the balance of the gravity force, surface tension force holding the liquid volume and pressure force. The addition of less than approximately 10% of 2μm spherical particles hardly changes the dispensing characteristics of Newtonian fluids except at the final stage of detachment. For polymeric liquids, the transient extensional property drastically changes the dripping dynamics. The force balance shows that the strain hardening of the polyacrylamide solution under the extensional flow causes severe retardation of the filament breakup. The filament breakup of the polymeric suspension is further decelerated by the increase in zero shear viscosity as a result of the particle addition.
What influences water conservation and towel reuse practices of hotel guests?
Han, H.,Hyun, S.S. Butterworths 2018 Tourism Management Vol.64 No.-
Understanding guests' water conservation and towel reuse behaviors is essential as sustainability is recently a vital issue in the hotel industry. Yet, guests' decision formation for such pro-environmental behaviors has not been sufficiently explored. This research filled such a void in the extant literature. Our empirical findings showed that guests' water conservation intention was a significant function of moral norm, anticipated feelings, and water saving behavior in everyday life. Our results also indicated that guests' towel reuse intention was significantly affected by moral norm, social norms, anticipated feelings, and towel reuse behavior in everyday life. Moreover, moral norm and descriptive norm were found to be the most influential factors determining water conservation and towel reuse intentions, respectively. This research adds to the extant literature in hospitality/tourism by providing valuable insights into how normative, affective, and habitual processes relate to guests' pro-environmental decisions during their stay at a hotel.
Han, H.,Hyun, S.S. Pergamon Press ; Elsevier Science Ltd 2017 INTERNATIONAL JOURNAL OF HOSPITALITY MANAGEMENT Vol.63 No.-
This study developed a theoretical framework in which overall image, image congruence, and quality of physical environment, service, and food affect guests' satisfaction and intentions to revisit a luxury hotel restaurant and visit other restaurants of the same hotel by considering the influence of conspicuousness as a moderator. The measurement model assessment revealed that all items included an acceptable level of measurement quality. Results of the structural analysis indicated that the research variables were in general significantly associated; quality dimensions and satisfaction had a mediating role; and the impact of satisfaction and overall image on decision formation was greater than that of other variables. Moreover, the structural invariance model assessment indicated that conspicuousness acted as a significant moderator. Overall, our proposed theoretical framework was found to include a sufficient power in predicting patrons' intentions for luxury hotel restaurant products. Using this quantitative approach, our research objectives were wholly achieved.
Han, H.,Oh, S.,Chang, C. B.,Kang, S. B. Springer Science + Business Media 2016 KNEE SURGERY SPORTS TRAUMATOLOGY ARTHROSCOPY Vol.24 No.8
<P>Anterior referencing and posterior referencing are two major techniques for positioning femoral components and balancing the sagittal plane during total knee arthroplasty (TKA). The purpose of this study was to evaluate the changes in medial and lateral posterior condylar offset (PCO) after bilateral TKA using anterior referencing (AR) or posterior referencing (PR) systems and compare the effect of the PCO changes on knee flexion. Twenty female patients (mean age, 68.6 years) underwent bilateral TKA using the AR technique in one knee and the PR technique in the contralateral knee. Three-dimensional reconstructed computed tomographic images from the sagittal plane were used to evaluate PCO before and after arthroplasty. Knee Society scores and range of motion were evaluated postoperatively at a mean of 2.9 years. Postoperative medial and lateral PCOs were significantly greater (p < 0.001 and p = 0.048, respectively) in the AR group (30.9 +/- 2.2 and 29.1 +/- 1.5 mm, respectively) than those in the PR group (29.1 +/- 2.7 and 27.3 +/- 2.3 mm, respectively). In addition, the degree of change in the PCO after TKA was greater in the AR group than in the PR group. On the final follow-up, no differences in the degree of knee flexion were observed between the two groups (124.7A degrees for AR and 124.5A degrees for PR). Knee Society scores were similar in the two groups both preoperatively and postoperatively. On the final follow-up, individual changes in the medial and lateral PCO were not associated with changes in the knee flexion angle. Restoration of PCO after TKA was more accurate with the PR technique than with the AR technique. However, the postoperative differences in PCO showed no correlation with changes in knee flexion 2 years after PCL-substituting TKA. Therapeutic study, Level I.</P>