The Negative Impact of Mobile Devices on Niche Product Consumption

Internet based information technology has provided the paradigm shift from Pareto principle to long tail phenomenon. However, the advent of small size mobile devices with higher search costs raises a negative question on this paradigm shift. The aim of this study is investigating the negative impact of mobile devices on niche product consumption. We collect 10 million user-device level transaction data with user profiles and content characteristics from a nation-wide e-book company in East Asia. We analyze the large size data with Pareto curve estimation and econometric modeling. As key findings, we found that smart phone users’ product sales are more concentrated than those of users with PCs or smart pads. Our empirical results support that mobile commerce markets do not follow long tail phenomenon, but follow “Pareto Principle” in terms of sales diversity because smart phone users have less willingness to purchase unpopular products than smart pad users

Multi-Screen Strategy for Selling Mobile Content to Customers

Our research aims to discover the role of multiple smart devices and their different screen sizes in paid content sales, thus building a multi-screen content sales strategy. Our econometric model adopts a difference-in-differences method to measure the impact of multi-screen devices on users’ content consumption through screen size effects. In a natural experiment setting, we sample 238 individual customers who registered a single smartphone with a 3- to 4-inch screen at the beginning and then added devices with a similar or larger screen. Our paper determines the parameters in existing theoretical frameworks of online consumer utility (product selection and digital content price) to determine paid content purchase behavior in a multi-screen environment. Our key findings are that the price sensitivity of content decreases as a user registers new smart devices and registering new devices with larger screens positively influences less popular content consumption more than a small screen device does

Perchlorate Degradation Using Partially Oxidized Titanium Ions and Ion Exchange Membrane Hybrid System

Perchlorate has entered human and environmental food chains and has received a great deal of attention because of its toxicity to humans. In this study, chemical degradation of perchlorate was investigated using partially oxidized titanium ions (Ti2+ and Ti3+) in solutions and as part of an ion exchange membrane reactor system. Aqueous titanium ions (Ti2+ and Ti3+) were applied to remove perchlorate ions and its destructive mechanism, reaction kinetics, and the effect of environmental factors were investigated. Titanium ions were able to degrade perchlorate ions very rapidly with half life less than one hour under conditions of high acid concentrations. A new reactor system with an ion exchange membrane was adapted to apply better the reactions of perchlorate destruction to water treatment practice. A novel treatment method was developed by integrating partially oxidized titanium ions with an ion exchange membrane, and it is named the Titanium and Membrane Hybrid System (TMH System). The results shown in this research demonstrate the feasibility of TMH System for perchlorate reduction. The perchlorate ions were rapidly adsorbed onto the ion exchange membrane and diffused through it, but they were reduced by titanium ions in the degradation zone relatively slowly. To enhance the overall rate of reaction, high concentrations of acid and Ti(III) are needed, but transport of hydrogen ions through the anion permeable membrane was observed and would be greater at higher acid concentrations. The proposed mathematical model predicts the performance and behavior of the TMH system for different physical and chemical conditions. It successfully described adsorption, diffusion and reduction of perchlorate in the system. This model could be used as an important tool for process design and optimization

A Nonlinear Optimization Model of Advertising Budget Allocation across Multiple Digital Media Channels

The goal of advertisers in the digital marketing industry is to optimize their advertising budgets. Such a budget allocation problem plays a key role in maximizing advertising performance from different marketing channels under planned advertising investment. This study aimed to design a budget-performance-based nonlinear programming model to find an optimized solution for the advertising budget allocation problem. The empirical analysis results of a leading e-business company’s advertising performance data show that the proposed non-LP model generates an optimized solution. The proposed model allows marketers to simulate expected advertising returns, such as conversions or revenues from different channels within their budget constraints

FS-OpenSecurity : A taxonomic modeling of security threats in SDN for future sustainable computing

Peer reviewedPublisher PD

Massive transfusion protocol: the reason it is necessary

Objective. The purpose of this study is to identify problems of emergency transfusion at the bedside and to determine need for massive transfusion protocol. Methods. We included patients who met the criteria for “trauma team activation” and were admitted to division of trauma. The amount of blood product transfused in each unit was investigated for balanced transfusion. We also investigated the compliance with assessment of blood consumption score. The correlation between the time elapsed from patient visit to first transfusion order and time elapsed from first transfusion order to transfusion start was analyzed. Finally, we investigated various factors which serve to influence the decision-making process regarding early transfusion order. Results. Ratio of packed Red blood cells (pRBC): Fresh frozen plasma (FFP) was well-balanced, but platelet transfusion done was much lower than pRBC and FFP in emergency room. The application of emergency blood release did not match the criteria of assessment of blood consumption (ABC) score. The time from the first transfusion order to the transfusion start was found to be constant irrespective of time from patient visit to first transfusion order. And, the time from the first transfusion order to transfusion start did not differ significantly among patients with early transfusion order and delayed transfusion order. Only systolic blood pressure of < 90 mmHg was identified as a major predictor for early transfusion order. Conclusion. Balanced transfusion is not easy and emergency transfusion could be delayed at the bedside. Integrated and systematic structures for massive transfusion protocol would be invaluable and indispensable

A Preliminary Report of Crosslinguistic Evidence on Efficacy of Semantic-Complexity Based Naming Treatment in Korean Aphasics

The current study investigated the efficacy of semantic-complexity based naming treatment in Korean participants with aphasia. Results suggested that both participants showed small to medium effect sizes in the trained items. However, generalization effects were greater in the participant who received treatment on the atypical items first, than the participant who was initiated on the typical items. These results are consistent with the previous findings in English-speaking aphasic participants (Kiran & Thompson, 2003; Kiran, 2008). Preliminary findings of two Korean participants with aphasia added crosslinguistic evidence on efficacy of the semantic complexity based naming treatment

Effects of Rhythmic Auditory Stimulation During Hemiplegic Arm Reaching in Individuals with Stroke: An Exploratory Study

SummaryObjective/BackgroundThis study investigated the effects of rhythmic auditory stimulation (RAS) on muscle activity and elbow motion during arm reaching with hemiplegic arm in participants with stroke.MethodsSixteen adults with stroke who resided in a community were recruited in this study. The RAS consisted of sound emitted from a digital metronome. While sitting upright in a chair, participants reached their arms towards a target (a switch on a table) both with and without RAS. The three-dimensional motion analysis system and surface electromyography system were used for measurements during the reaching tasks.ResultsWe found that RAS elicited better performance in reaching movements than those movements performed without RAS. RAS shortened the movement time (p = .002), reduced the change in acceleration (p = .001), increased the elbow extension range of motion (p = .001), increased muscle activation of the triceps brachii (p = .024), and reduced the co-contraction ratio (p = .015) of the affected arm.ConclusionRAS might be a useful technique to facilitate improvements in motor function of the affected arm in patients with stroke

Validation of Compact-Standard Antenna Method for Antenna Calibration above 1 GHz

In this paper, we propose a compact-standard antenna method (C-SAM) for antenna calibration above 1 GHz. The test-site evaluation of the fully-anechoic room (FAR) condition satisfied the free-space conditions. When the C-SAM was compared with conventional antenna calibration methods, the maximum deviation was within ±0.18 dB for the 1–18 GHz frequency range. Unlike the conventional antenna calibration methods, the proposed method is a simple standard antenna method that calculates the antenna factor of the antenna under calibration (AUC) with only one site insertion loss (SIL) measurement of an antenna calibration site that meets free-space conditions. Therefore, the C-SAM is the best candidate for antenna calibration owing to the method’s simplicity and cost-reduction potential