모바일 인스턴트 메신저 이용 동기, 만족도 및 충성도차이가 정보공유에 미치는 영향에 관한 비교연구: 카카오톡과 중국의 위챗을 중심으로

등탁유 ( Zhuo Wei Deng ),유승관 ( Seung Kwan Ryu ) 한국커뮤니케이션학회 2016 커뮤니케이션학연구 Vol.24 No.2

본 연구는 스마트폰이 보편화된 시대에서 한국과 중국에서 모바일 인스턴트 메신저에 대한 이용동기, 만족도 및 충성도 차이가 이용자의 정보공유에 어떠한 영향을 미치는지와 정보의 방향성에 따른 양국간차이가 있는지에 대해 분석했다. 연구결과 첫째, 모바일 인스턴트 메신저 이용 동기로 ‘친목도모 관계형성’, ‘충족감을 얻기’,‘타인 동향 얻기’, ‘스트레스 해소’ 요인이 추출되었다. 이러한 이용 동기 중 ‘친목도모 관계형성’, ‘타인과 일상정보를 공유하기’, ‘스트레스 해소’, ‘타인 동향 얻기’, ‘특정분야 정보 얻기’, ‘지루한 시간 보내기’는 정보공유에 영향을 미치는 것으로 나타났다. 이용자 만족도 중에서는 ‘MIM를 통한 교류 만족’, ‘MIM 사용할 때 기분 좋음’은 정보공유에 영향을 미치는 것으로 나타났다. 그리고 모바일 인스턴트 메신저이용자 충성도 중에서는 ‘본MIM 지속 이용’, ‘본MIM 우선 이용’, ‘타인에게 추천’,‘다른 MIM 변경’ 요인이 정보공유에 영향을 미치는 것으로 나타났다. 결론적으로 첫째, 모바일 인스턴트 메신저 이용에 있어서는 특정한 정보추구나 오락의 동기 보다 인간 관계형성 및 타인과 일상정보를 나누기 위한 요인이 정보공유에 영향을 주는 주된 요인이라는 것이 확인되었다. 둘째, 타인과의 교류에 만족하는 사용자가 정보공유 빈도가 높은 것으로 확인되었다. 셋째, 긍정적/부정적 메시지내용에 대한 정보공유차이를 살펴본 결과 양국 공통적으로 긍정적 메시지가 부정적메시지보다 정보공유 빈도가 더 많은 것으로 나타나 온라인이나 SNS와는 다른 특성을 보였다. 마지막으로 한국과 중국 이용자에 대한 비교분석 결과 자아추구 동기, 정보추구 동기, 이용 충성도, 정보공유 요인에 있어서 전반적으로 중국 사용자가 한국 사용자보다 수치가 높은 것으로 확인되어 MIM의 서비스 기술적 차이나 정치사회적 차이로 인한 요인이 존재할 수 있음을 간접적으로 확인할 수 있었다. This study investigated reason, satisfaction, loyalty and information sharing and diffusion effects of mobile instant messenger. Specific research questions are as follows: First, which factor of motivation of mobile instant messenger affects on the degree of satisfaction? Second, which factor of satisfaction and loyalty of mobile instant messenger affects on the degree of loyalty? Third, what is the difference between Korean and Chinese in terms of motivation, satisfaction, loyalty, and the direction of information in mobile instant messenger on information sharing and diffusion? To answer aforementioned research questions, this study conducted survey both in Korea and China based on on-line as well as off-line. Findings are as follows: First, there are the influences on satisfaction by the “Interpersonal pursuit,” “Pursuit of adequate sense,” “Pursuit movements of other people,” and “Reduce pressure”. These above belong to the Use motivation. Second, there also have the impact that the Use motivation including the “Interpersonal pursuit,” “Pursuit of adequate sense,” “Pursuit movements of other people,” and “Reduce pressure” on loyalty. Third, there are the influences on information sharing and diffusion by the “Interpersonal pursuit,” “Share daily information with others”, “In order to reduce the pressure”, “Seeking of movements by other people”, “Pursue specific information”, “Kill the boring time”. Lastly, there are some aspects of users’ satisfaction including “Satisfy through exchanged by MIM,” “Feel happy when using MIM” affect information sharing and diffusion. And there are also some aspects of users’ loyalty including “Continued to use this MIM”, “Priority of this MIM”, “Recommend this MIM to others”, “Replace to use other MIMs” affect information sharing and diffusion. Lastly, positive information were being shared much more than negative ones in both countries, Through this research, providing direction of Mobile Instant Messenger on how to develop can meet needs of users from both Korea and China.

Reformability evaluation of blasting-enhanced permeability in in situ leaching mining of low-permeability sandstone-type uranium deposits

Wang Wei,Liang Xuanyu,Niu Qinghe,Wang Qizhi,Zhuo Jinyi,Su Xuebin,Zhou Genmao,Zhao Lixin,Yuan Wei,Chang Jiangfang,Zheng Yongxiang,Pan Jienan,Wang Zhenzhi,Ji Zhongmin 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.8

It is essential to evaluate the blasting-enhanced permeability (BEP) feasibility of a low-permeability sandstone-type uranium deposit. In this work, the mineral composition, reservoir physical properties and rock mechanical properties of samples from sandstone-type uranium deposits were first measured. Then, the reformability evaluation method was established by the analytic hierarchy process-entropy weight method (AHP-EWM) and the fuzzy mathematics method. Finally, evaluation results were verified by the split Hopkinson Pressure Bar (SHPB) experiment and permeability test. Results show that medium sandstone, argillaceous sandstone and siltstone exhibit excellent reformability, followed by coarse sandstone and fine sandstone, while the reformability of sandy mudstone is poor and is not able to accept BEP reservoir stimulation. The permeability improvement and the distribution of damage fractures before and after the SHPB experiment confirm the correctness of evaluation results. This research provides a reformability evaluation method for the BEP of the low-permeability sandstone-type uranium deposit, which contributes to the selection of the appropriate regional and stratigraphic horizon of the BEP and the enhanced ISL of the low-permeability sandstone-type uranium deposit.

Comparison of the efficacy and safety of transurethral laser versus open prostatectomy for patients with large-sized benign prostatic hyperplasia: A meta-analysis of comparative trials

Hai-bin Wei,Bing-yi Guo,Yao-fen Tu,Xuan-han Hu,Wei Zheng,Da-hong Zhang,Jian Zhuo 대한비뇨의학회 2022 Investigative and Clinical Urology Vol.63 No.3

Purpose: The selection of open prostatectomy (OP) over transurethral laser surgery is controversial for large volume prostates. Thus, we aim to compare the efficacy and safety of transurethral laser versus OP, and provide the latest evidence of clinical practice for large-sized benign prostatic hyperplasia (BPH). Materials and Methods: This meta-analysis used Review Manager V5.3 software and the systematic literature search of Cochrane Library, Embase, PubMed, and Web of Science datasets was performed for citations published from 2000 to 2020 that compared transurethral laser with OP for the treatment of large BPH. Variables of interest assessing the two techniques included clinical characteristics, and the perioperation-, effectiveness-, and complication-related outcomes. Results: The meta-analysis included twelve studies containing 1,514 patients, with 792 laser and 722 OP. The transurethral laser group was associated with shorter hospital stay and catheterization duration, and less hemoglobin decreased in the perioperative variables. There was no significant difference in the international prostate symptom score, post-void residual urine volume, maximum flow rate, and quality of life score. Transurethral laser group had a significantly lower incidence of blood transfusion than OP group (odds ratio, 0.10; 95% confidence interval, 0.05 to 0.19; p<0.001; I2=8%), and no statistical differences were found with respect to the other complications. Conclusions: Both OP and transurethral laser prostatectomy are effective and safe treatments for large prostate adenomas. With these advantages of less blood loss and transfusion, and shorter catheterization time and hospital stay, laser may be a better choice for large BPH.

Thermodynamic simulation and structural optimization of the collimator in the drift duct of EAST-NBI

Tang Ning,Hu Chun-dong,Xie Yuan-lai,Wei Jiang-long,Cui Zhi-Wei,Xie Jun-Wei,Pan Zhuo,Jiang Yao 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.11

The collimator is one of the high-heat-flux components used to avoid a series of vacuum and thermal problems. In this paper, the heat load distribution throughout the collimator is first calculated through experimental data, and a transient thermodynamic simulation analysis of the original model is carried out. The error of the pipe outlet temperature between the simulated and experimental values is 1.632%, indicating that the simulation result is reliable. Second, the model is optimized to improve the heat transfer performance of the collimator, including the contact mode between the pipe and the flange, the pipe material and the addition of a twisted tape in the pipe. It is concluded that the convective heat transfer coefficient of the optimized model is increased by 15.381% and the maximum wall temperature is reduced by 16.415%; thus, the heat transfer capacity of the optimized model is effectively improved. Third, to adapt the long-pulse steady-state operation of the experimental advanced superconducting Tokamak (EAST) in the future, steady-state simulations of the original and optimized collimators are carried out. The results show that the maximum temperature of the optimized model is reduced by 37.864% compared with that of the original model. The optimized model was changed as little as possible to obtain a better heat exchange structure on the premise of ensuring the consumption of the same mass flow rate of water so that the collimator can adapt to operational environments with higher heat fluxes and long pulses in the future. These research methods also provide a reference for the future design of components under high-energy and long-pulse operational conditions

Attention and Working Memory Task- Load Dependent Activation Increase with Deactivation Decrease after Caffeine Ingestion

Wei Peng,Jian Zhang,Da Chang,Zhuo-Wen Shen,Yuanqi Shang,Donghui Song,Qiu Ge,Xuchu Weng,Ze Wang 대한자기공명의과학회 2017 Investigative Magnetic Resonance Imaging Vol.21 No.4

Purpose: Caffeine is the most widely consumed psychostimulant. It is often adopted as a tool to modulate brain activations in fMRI studies. However, its pharmaceutical effect on task-induced deactivation has not been fully examined in fMRI. Therefore, the purpose of this study was to examine the effect of caffeine on both activation and deactivation under sustained attention. Materials and Methods: Task fMRI was acquired from 26 caffeine naive healthy volunteers before and after taking caffeine pill (200 mg). Results: Statistical analysis showed an increase in cognition-load dependent task activation but a decrease in load dependent de-activation after caffeine ingestion. Increase of attention and memory task activation and its load-dependence suggest a beneficial effect of caffeine on the brain even though it has no overt behavior improvement. The reduction of deactivation by caffeine and its load-dependence indicate reduced facilitation from task-negative networks. Conclusion: Caffeine affects brain activity in a load-dependent manner accompanied by a disassociation between task-positive network and task-negative network.

Glucose regulated protein 78 promotes cell invasion via regulation of uPA production and secretion in colon cancer cells

( Zong Wei Li ),( Lic Hao Zhang ),( Han Qing Li ),( Shu Hua Shan ),( Zhuo Yu Li ) 생화학분자생물학회(구 한국생화학분자생물학회) 2014 BMB Reports Vol.47 No.8

Glucose regulated protein 78 (GRP78) is frequently highlyexpressed in tumor cells, contributing to the acquisition of severalphenotypic cancer hallmarks. GRP78 expression is also positivelycorrelated with tumor metastasis, and promotes hepatocellularcarcinoma cell invasion via increasing cell motility, however, other mechanisms involving the prometastatic roles of GRP78remain to be elucidated. Here we report that forced GRP78expression promotes colon cancer cell migration and invasionthrough upregulating MMP-2, MMP-9 and especially uPAproduction. These effects of GRP78 are mediated by enhancingthe activation of β-catenin signaling. Interestingly, we identify thatGRP78 interacts with uPA both in the cells and in the culturemedium, suggesting that GRP78 protein is likely to directlyfacilitate uPA secretion via protein-protein interaction. Takentogether, our findings demonstrate for the first time that besidesstimulation of cell motility, GRP78 can act by increasingproteases production to promote tumor cell invasion.

Attention and Working Memory Task-Load Dependent Activation Increase with Deactivation Decrease after Caffeine Ingestion

Peng, Wei,Zhang, Jian,Chang, Da,Shen, Zhuo-Wen,Shang, Yuanqi,Song, Donghui,Ge, Qiu,Weng, Xuchu,Wang, Ze Korean Society of Magnetic Resonance in Medicine 2017 Investigative Magnetic Resonance Imaging Vol.21 No.4

Purpose: Caffeine is the most widely consumed psychostimulant. It is often adopted as a tool to modulate brain activations in fMRI studies. However, its pharmaceutical effect on task-induced deactivation has not been fully examined in fMRI. Therefore, the purpose of this study was to examine the effect of caffeine on both activation and deactivation under sustained attention. Materials and Methods: Task fMRI was acquired from 26 caffeine naive healthy volunteers before and after taking caffeine pill (200 mg). Results: Statistical analysis showed an increase in cognition-load dependent task activation but a decrease in load dependent de-activation after caffeine ingestion. Increase of attention and memory task activation and its load-dependence suggest a beneficial effect of caffeine on the brain even though it has no overt behavior improvement. The reduction of deactivation by caffeine and its load-dependence indicate reduced facilitation from task-negative networks. Conclusion: Caffeine affects brain activity in a load-dependent manner accompanied by a disassociation between task-positive network and task-negative network.

A QoE Evaluation Method for RT-HDMV Based on Multipath Relay Service

Yu-Zhuo Zhan,Wei-Min Lei,Yun-Chong Guan 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1

In the paper, a multipath relay service based on QoE (Quality of Experience) evaluation method is proposed for RT-HDMV (Real-Time High Definition Medical Video). The method eliminates several of the limitations in the existing methods for the conventional single-path transmission. It can fully utilize the finite network resources and transmission bandwidth to meet the users’ demands of RT-HDMV to get the better score of QoE. We use a three-stage framework to evaluate the QoE: construct the multipath relay transmission for RT-HDMV, design the load distribution strategy by the mapping between QoS (Quality of Service) and QoE and coupling the multipath scene, and redefine the rule of QoE evaluation. The experiments show that our framework can provide better QoE guarantees for RT-HDMV than existing methods in traditional single-channel transmission scenarios.

Anti-proliferative Effects of Atractylis lancea (Thunb.) DC. via Down-regulation of the c-myc/hTERT/Telomerase Pathway in Hep-G2 Cells

Guo, Wei-Qiang,Li, Liang-Zhi,He, Zhuo-Yang,Zhang, Qi,Liu, Jia,Hu, Cui-Ying,Qin, Fen-Ju,Wang, Tao-Yun Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11

Atractylis lancea (Thunb.) DC. (AL), an important medicinal herb in Asia, has been shown to have anti-tumor effects on cancer cells, but the involved mechanisms are poorly understood. This study focused on potential effects and molecular mechanisms of AL on the proliferation of the Hep-G2 liver cancer cell line in vitro. Cell viability was assessed by MTT test in Hep-G2 cells incubated with an ethanol extract of AL. Then, the effects of AL on apoptosis and cell cycle progression were determined by flow cytometry. Telomeric repeat amplification protocol (TRAP) assays was performed to investigate telomerase activity. The mRNA and protein expression of human telomerase reverse transcriptase (hTERT) and c-myc were determined by real-time RT-PCR and Western blotting. Our results show that AL effectively inhibits proliferation in Hep-G2 cells in a concentrationand time-dependent manner. When Hep-G2 cells were treated with AL after 48h,the $IC_{50}$ was about 72.1 ${\mu}g/mL$. Apoptosis was induced by AL via arresting the cells in the G1 phase. Furthermore, AL effectively reduced telomerase activity through inhibition of mRNA and protein expression of hTERT and c-myc. Hence, these data demonstrate that AL exerts anti-proliferative effects in Hep-G2 cells via down-regulation of the c-myc/hTERT/telomerase pathway.

Mining Implicit Correlations between Users with the Same Role for Trust-Aware Recommendation

( Haifeng Liu ),( Zhuo Yang ),( Jun Zhang ),( Xiaomei Bai ),( Wei Wang ),( Feng Xia ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.12

Trust as one of important social relations has attracted much attention from researchers in the field of social network-based recommender systems. In trust network-based recommender systems, there exist normally two roles for users, truster and trustee. Most of trust-based methods generally utilize explicit links between truster and trustee to find similar neighbors for recommendation. However, there possibly exist implicit correlations between users, especially for users with the same role (truster or trustee). In this paper, we propose a novel Collaborative Filtering method called CF-TC, which exploits Trust Context to discover implicit correlation between users with the same role for recommendation. In this method, each user is first represented by the same-role users who are co-occurring with the user. Then, similarities between users with the same role are measured based on obtained user representation. Finally, two variants of our method are proposed to fuse these computed similarities into traditional collaborative filtering for rating prediction. Using two publicly available real-world Epinions and Ciao datasets, we conduct comprehensive experiments to compare the performance of our proposed method with some existing benchmark methods. The results show that CF-TC outperforms other baseline methods in terms of RMSE, MAE, and recall.