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An Empirical Study on the Impact of Permission Smell in Android Applications
Zhiqiang Wu,Hakjin Lee(이학진),Scott Uk-Jin Lee 한국컴퓨터정보학회 2021 韓國컴퓨터情報學會論文誌 Vol.26 No.6
본 논문에서는 개발자가 작성한 코드와 써드파티 라이브러리로 인해 발생하는 Permission Smell을 탐지하여 그 영향에 대해 다각적으로 분석했다. 이를 위해서 실제 구글 플레이 스토어에 존재하는 Android 앱로 구성된 대규모 데이터셋을 활용하여 존재하는 Permission Smell의 영향을 조사 및 분석하는 실증적 연구를 수행하였다. 연구 결과에 따르면 대다수의 안드로이드 앱에 Permission Smell이 존재하며 특히 써드파티 라이브러리는 개발자가 사용하지 않는 기능에 대해서도 권한을 요구하므로 이러한 Smell 들을 더 많이 발생시킨다. 또한, 대다수의 개발자는 써드파티 라이브러리로 인해 선언된 불필요한 권한을 올바르게 비활성화하지 않는다는 것을 파악하였다. 이러한 결과를 바탕으로 본 논문에서는 Permission Smell이 사용자 경험에 미치는 영향에 대해 논의한다. 결과적으로 불필요한 권한을 요구하는 앱이더라도 다운로드 횟수에 영향을 주지는 않았다. 그러나 불필요한 권한을 요구하는 앱들은 사용자들로부터 더 낮은 평가를 받았다. In this paper, we proposed a sniffer to detect permission smells from developer and third-party libraries’ code. Moreover, we conducted an empirical study to investigate unnecessary permissions on large real-world Android apps. Our analysis indicates that permission smell extensively exists in Android apps. According to the results, permission smells exist in most Android apps. In particular, third-party libraries request permission for functionalities that are not used by developers, which cause more smells. Moreover, most developers do not properly disable unnecessary permissions that are declared for third-party libraries. We discussed the impacts of permission smells on user experiences. As a result, the existence of permission smell does not impact the number of downloads. However, apps that have more unnecessary permissions have received lower ratings from users.
Wu Zhiqiang,Xie Jinsen,Chen Pengyu,Xiao Yingjie,Ni Zining,Liu Tao,Deng Nianbiao,Sun Aikou,Yu Tao 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
Small rod-controlled pressurized water reactors (PWR) are the ideal energy source for vessel propulsion, benefiting from their high reactivity control efficiency. Since the control rods (CRs) increase the complexity of reactivity control, this paper seeks to study the performance of CRs in small rod-controlled PWRs to extend the lifetime and reduce power offset due to CRs. This study investigates CR grouping, move-in/out strategies, and axially non-uniform design effects on core neutron physics metrics. These metrics include axial offset (AO), core lifetime (CL), fuel utilization (FU), and radial power peaking factor (R-PPF). To simulate the movement of the CRs, a "Critical-CR-burnup" function was developed in OpenMC. In CR designs, the CRs are grouped into three banks to study the simultaneous and prioritized move-in/out strategies. The results show CL extension from 590 effective full power days (EFPDs) to 638–698 EFPDs. A lower-worth prioritized strategy minimizes AO and the extremum values decrease from 0.69 and + 0.81 to 0.28 and + 0.51. Although an axially non-uniform CR design can improve AO at the beginning of cycle (BOC), considering the overall CR worth change is crucial, as a significant decrease can adversely impact axial power distribution during the middle of cycle (MOC).
Forgotten Permission Usages: An Empirical Study on App Description Based Android App Analysis
Zhiqiang Wu,Scott Uk-Jin Lee 한국컴퓨터정보학회 2021 韓國컴퓨터情報學會論文誌 Vol.26 No.6
본 논문에서는 안드로이드 앱 설명이 애플리케이션 품질 측정에 충분한 권한 사용을 제공하는지에 대해 연구하였다. 안드로이드 애플리케이션 설명은 품질측정, 기능추천(functionality recommendation), 말웨어감지와 같은 다양한 목적으로 분석된다. 그러나 많은 앱들이 설명에서 실수 혹은 고의로 권한 사용을 공개하지 않는다. 이전 연구에서는 가장 중요한 것은 애플리케이션 설명에서 권한 사용에 대한 내용이 없거나 부족하면 애플리케이션 설명을 정확하게 분석할 수 없었다. 권한과 앱 설명 간의 일관성을 평가하기 위해 29,270개의 애플리케이션 설명에 대한 안드로이드 권한을 예측하는 방법을 구현했다. 결과로 앱 설명의 25%는 권한에 대한 의미를 포함하지 않았으며 앱 설명의 57%는 권한 사용에 대한 내용을 정확하게 반영 할 수 없다. In this paper, we conducted an empirical study to investigate whether Android app descriptions provide enough permission usages for measuring app quality in terms of human writing and consistency between code and descriptions. Android app descriptions are analyzed for various purposes such as quality measurement, functionality recommendation, and malware detection. However, many app descriptions do not disclose permission usages, whether accidentally or on purpose. Most importantly, the previous studies could not precisely analyze app descriptions if permission usages cannot be completely introduced in app descriptions. To assess the consistency between permissions and app descriptions, we implemented a state-of-the-art method to predict Android permissions for 29,270 app descriptions. As a result, 25% of app descriptions may not contain any permission semantic, and 57% of app descriptions cannot accurately reflect permission usages.
Research progress and treatment of radiation enteritis and gut microbiota
Huiwen Ren(Huiwen Ren),Qi Wu(Qi Wu),Zhiqiang Sun(Zhiqiang Sun),Mingming Fang(Mingming Fang),Jun Liu(Jun Liu),Judong Luo(Judong Luo) 대한방사선종양학회 2023 Radiation Oncology Journal Vol.41 No.2
Radiation enteritis is a kind of intestinal radiation injury in patients with pelvic and retroperitoneal malignancies after radiotherapy, and its occurrence and development process are very complicated. At present, studies have confirmed that intestinal microecological imbalance is an important factor in the formation of this disease. Abdominal radiation causes changes in the composition of the flora and a decrease in its diversity, which is mainly manifested by a decrease in beneficial bacterial species such as Lactobacilli and Bifidobacteria. Intestinal dysbacteriosis aggravates radiation enteritis, weakens the function of the intestinal epithelial barrier, and promotes the expression of inflammatory factors, thereby aggravating the occurrence of enteritis. Given the role of the microbiome in radiation enteritis, we suggest that the gut microbiota may be a potential biomarker for the disease. Treatment methods such as probiotics, antibiotics, and fecal microbiota transplantation are ways to correct the microbiota and may be an effective way to prevent and treat radiation enteritis. Based on a review of the relevant literature, this paper reviews the mechanism and treatment of intestinal microbes in radiation enteritis.
Zhiqiang Liu,Chaojie Chong,Zhewen Dong,Yaqi Wu,Wanying Li,Haokun Chen,Shumei Zhong,Junyang Liu,Qi Qi Pang,Jia-Le Song,Yanyuan Zhou 한국식품영양과학회 2021 한국식품영양과학회 학술대회발표집 Vol.2021 No.10
To investigate the effect of ACP on letrozole-induced PCOS rats. All rats were divided into normal groups, PCOS group, metformin group and ACP group. The body weight (BW) was recorded every three days, and the final body weight as well as ovarian weight were recorded. Serum levels of TC, TG, HDL-C, LDL-C and E2, T, FSH and LH were measured by ELISA assay, and the LH/FSH ratio was calculated. The results showed that ACP decreased the BW and the ratio of ovarian to BW. Compared with the normal group, the serum levels of T, LH, LH/FSH, TG, TC, LDL-C increased, and the levels of FSH, E2, HDL-C decreased in PCOS group. ACP effectively improves the serum levels of FSH, LH/FSH, TG, TC, LDL-C and other related factors. The results of H&E staining of ovarian tissues showed that the ACP group showed different degrees of improvement in the reduced number of corpus luteum, thinning of granulosa cell layer, follicular capsular dilatation and follicular atresia. ACP not only reduces BW and the ratio of ovarian to BW, but also it can elevate the level of FSH and reduce LH/FSH, TG, TC and HDL-C levels. Furthermore, ACP can protect ovarian tissue to some extent.
Zhiqiang Xu,Jun Wang,ShaoHui Yin,Heng Wu,Liyin Yi 한국정밀공학회 2021 International Journal of Precision Engineering and Vol.22 No.9
With the increase in demand for various types of small-aperture aspherical optical parts, the machining of a small tungsten carbide alloy mould with high accuracy is not only required, but essential. Ultra-precision grinding is generally used to process the small tungsten alloy aspheric mould, but there are some grinding marks and surface defects left by grinding. Aimed at the problems above, this paper introduce a new compound processing technology which integrates ultra-precision grinding and oblique-axis magnetorheological polishing technology on the same machine tool. First, we developed the machining equipment of oblique-axis ultra-precision grinding and magnetorheological polishing, and then, we analyzed the surface accuracy, surface roughness, microstructure and subsurface damage of tungsten alloy aspheric mould after grinding and polishing. The experimental results indicated that the surface accuracy of workpiece was improved to smaller than 200 nm in PV value, surface roughness Ra was reduced to about 1 nm after using the compound processing technology.