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Dynamic Security Policy Enforcement on Android
Matúš Vančo,Lukáš Aron 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.9
This work presentss the system for dynamic enforcement of access rights on Android. Each application will be repackaged by this system, so that the access to selected private data is restricted for the outer world. The system intercepts the system calls using Aurasium framework and adds an innovative approach of tracking the information flows from the privacy-sensitive sources using tainting mechanism without need of administrator rights. There has been designed file-level and data-level taint propagation and policy enforcement based on Android binder.
Grid-Enabled Parallel Simulation Based on Parallel Equation Formulation
Bojan Andjelkovic,Vančo B. Litovski,Volker Zerbe 한국전자통신연구원 2010 ETRI Journal Vol.32 No.4
Parallel simulation is an efficient way to cope with long runtimes and high computational requirements in simulations of modern complex integrated electronic circuits and systems. This paper presents an algorithm for parallel simulation based on parallelization in equation formulation and simultaneous calculation of matrix contributions for nonlinear analog elements. In addition, the paper describes the development of a grid interface for a parallel simulator that enables a designer to perform simulations on distant computer clusters. Performances of the developed parallel simulation algorithm are evaluated by simulation of a microelectromechanical system.
Tran Van Toan,Myeong Lyeol Lee,Ha Sik Sim,Hye Kyung Kim,Gyu Ho Byuon,Yong Soo Choi 한국양봉학회 2014 韓國養蜂學會誌 Vol.29 No.1
There are two subspecies Apis cerana in Viet Nam, A. c. cerana and A. c. indica. Subspecies A. c. cerana distributes on Dong Van plateau, Ha Giang province in the North of Viet Nam and A. c. indica distributes in the rest areas of the country. In this paper we conducted to hybridize between virgin queen A. c. cerana in Dong Van (D) with drones A. c. indica in Ha Tay (H) and in Yen Bai (Y). Some biological characteristic of two hybrids Dong Van - Ha Tay (DH) and Dong Van - Yen Bai (DY) were studied from May to December, 2011 in Ha Tay and Son La provinces of Viet Nam. The results initially showed that egg-laying capacity of DH was 570±76 eggs/24h and DY was 572±70 eggs/24h while of these in control H was only 511±69 eggs/24h. The inbreeding rate of DH and DY were 3.71 and 2.85% respectively lower than these of D (8.11%) and H (7. 65%). Honey yields (a floral season) of DH and DY were 10.41±2.18kg/colony and 10.85±2.06kg/colony respectively, exceeded control H (8.58±1.52kg/colony) from 21.33 to 26.46%.
Van Hao HOANG(Van Hao HOANG ),Van Vien VU(Van Vien VU ),Quang Truong NGO(Quang Truong NGO ) 한국유통과학회 2023 유통과학연구 Vol.21 No.8
Purpose: Online meeting is chosen instead of face-to-face conferences as a solution that ensures both effectiveness and legality during times of strong epidemic outbreaks. In the current period, managers can have different types of meeting options for information distribution. This study has examined the effect of past behavior on the managers’ intention of organizing online meetings. Research design, data and methodology: Data were collected from a survey with 475 managers and put into SmartPLS 4.0 for analysis. Partial least squares structural equation modeling (PLS-SEM) was employed to test relationships in the research model. Results: The findings indicated that past behavior plays the most critical role in explaining the organizing online meeting intention of managers, followed by attitude and subjective norms. Meanwhile, the perceived behavioral control factor has absolutely no effect on intention in the context of this study. Notably, attitude and subjective norms also remarkably mediated the impact of past behavior on managers’ intention. Conclusions: This study has added to the understanding of the meeting organization behavior of managers. Even if the epidemic is under control, the administrators should still organize some meetings in the form of online because it will affect the social perceptions of future behavior and behavioral intention.
Atomically thin p–n junctions with van der Waals heterointerfaces
Lee, Chul-Ho,Lee, Gwan-Hyoung,van der Zande, Arend M.,Chen, Wenchao,Li, Yilei,Han, Minyong,Cui, Xu,Arefe, Ghidewon,Nuckolls, Colin,Heinz, Tony F.,Guo, Jing,Hone, James,Kim, Philip Nature Publishing Group, a division of Macmillan P 2014 Nature nanotechnology Vol.9 No.9
Semiconductor p–n junctions are essential building blocks for electronic and optoelectronic devices. In conventional p–n junctions, regions depleted of free charge carriers form on either side of the junction, generating built-in potentials associated with uncompensated dopant atoms. Carrier transport across the junction occurs by diffusion and drift processes influenced by the spatial extent of this depletion region. With the advent of atomically thin van der Waals materials and their heterostructures, it is now possible to realize a p–n junction at the ultimate thickness limit. Van der Waals junctions composed of p- and n-type semiconductors—each just one unit cell thick—are predicted to exhibit completely different charge transport characteristics than bulk heterojunctions. Here, we report the characterization of the electronic and optoelectronic properties of atomically thin p–n heterojunctions fabricated using van der Waals assembly of transition-metal dichalcogenides. We observe gate-tunable diode-like current rectification and a photovoltaic response across the p–n interface. We find that the tunnelling-assisted interlayer recombination of the majority carriers is responsible for the tunability of the electronic and optoelectronic processes. Sandwiching an atomic p–n junction between graphene layers enhances the collection of the photoexcited carriers. The atomically scaled van der Waals p–n heterostructures presented here constitute the ultimate functional unit for nanoscale electronic and optoelectronic devices.
Joost A.G. van der Heijden,Kelly G.H. van de Pas,Frank J.C. van den Broek,Francois M.H. van Dielen,Gerrit D. Slooter,Adriana J.G. Maaskant-Braat 대한대장항문학회 2022 Annals of Coloproctolgy Vol.38 No.1
Purpose: Transanal total mesorectal excision (TaTME) was developed to overcome surgical difficulties experienced in distal pelvic dissection. Concerns have been raised about potential worse postoperative functional outcomes after TaTME. Also, the oncological safety was questioned. This study aimed to describe the functional, surgical, oncological outcomes and quality of life (QoL) after TaTME. Methods: All consecutive TaTME cases for rectal cancer without disseminated disease between December 2016 and April 2019 were included. The Wexner incontinence score, low anterior resection syndrome (LARS) score, fecal incontinence-related QoL, and the European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-core questionnaire and 29-item module (EORTC QLQ-C30/CR29) were collected. Kaplan-Meier analysis was used to calculate local recurrence-free survival. Results: Thirty patients were eligible for analysis of which 23 received questionnaires. Response rate was 74%. After a median follow-up of respectively 20.0 and 23.0 months for functional and oncological outcomes, the median (interquartile range) of Wexner incontinence and LARS scores were 9.0 (7.0–12.0) and 33.1 (25.0–39.0). Major LARS was present in 73.3%. Fecal incontinence, general and colorectal-specific QoL subdomains that are associated with poor bowel function scored in line with previously reported data. The 2-year actuarial cumulative local recurrence rate was 3.7% (95% confidence interval, 2.4%–5.0%). Conclusion: TaTME may lead to significant functional impairments. Patients should receive preoperative counseling on this topic and be fully aware of the potential consequences of their treatment. Oncological data were in line with other short- to moderate-term data and did not show alarming results.
Van Bon Nguyen(Van Bon Nguyen ) 서울대학교 경제연구소 2022 Seoul journal of economics Vol.35 No.4
Public spending is a crucial instrument of fiscal policy in running the economy. Most governments use public spending actively to overcome the cyclicality of the economy. However, the increase in government spending financed by public debt can negatively contribute to the private sector investment. This study raises two research questions: (i) Does public debt in developing countries crowd out private investment? (ii) What is the role of governance in public debt–private investment relationship in these countries? For the answers, we apply the two-step difference generalized method of moments Arellano–Bond estimator to empirically investigate the effects of public debt, governance, and their interactions on private investment for a sample of 98 developing countries from 2002 to 2019. We then employs the pooled mean group estimator to check the robustness of estimates. Results show that public debt crowds out private investment, whereas governance stimulates it. Notably, the crowding-out effect of interaction on private investment seems counterintuitive. Furthermore, economic growth and trade openness enhance private investment. These findings suggest policy implications for governments in developing countries for controlling and managing public debt to promote the private sector investment.