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- 저자 : ( Wei Chen Chien ) (검색결과 64 건)
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A Simple Timeout Algorithm for Point-to-Multipoint ABR Service
Lai, Wei-Kuang,Chen, Chien-Ting,Li, Chilin The Korea Institute of Information and Commucation 2004 Journal of communications and networks Vol.6 No.1
The ABR point-to-multipoint connection is now playing a more important role than before. Many consolidation algorithms have been proposed to solve the consolidation noise problem and the slow transient response problem. But few timeout algorithms are proposed to handle the non-responsive branches for the multicast connections. Chen’s algorithm needs exchanging control messages between switches [9]. Besides, it may mistake a responsive branch as a non-responsive branch because of fast changes in source rates, which causes wrong information in BRM cells and may lead to network congestion and data losses in the responsive branch. We propose a simple timeout algorithm which can handle the non-responsive branches without exchanging message between switches. The timeout value for each switch is computed locally. Simulation results show that the proposed timeout algorithm can efficiently handle the non-responsive branches and utilize the available bandwidth within a small period of time. In addition, our algorithm could handle the situation when the source rates change quickly.
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Wei-Yi Lei,Shu-Wei Liang,Taher Omari,Wei-Chuan Chang,Ming-Wun Wong,Jui-Sheng Hung,Chih-Hsun Yi,Tso-Tsai Liu,Lin Lin,C Prakash Gyawali,Chien-Lin Chen 대한소화기 기능성질환∙운동학회 2022 Journal of Neurogastroenterology and Motility (JNM Vol.28 No.4
Background/Aims Straight leg raise (SLR) can be utilized to evaluate the integrity of the esophagogastric junction during high-resolution manometry (HRM). We aim to assess the value of transient hiatal separation during SLR in symptomatic reflux patients. Methods Consecutive reflux patients undergoing esophageal HRM and pH monitoring were included. Transient hiatal separation was defined by a ≥ 1 cm separation between the lower esophageal sphincter and crural diaphragm during SLR. We compared esophageal motor patterns and reflux monitoring parameters between patients with normal, transiently abnormal and consistently abnormal esophagogastric junction morphology during SLR. Results Of 85 (56.3% female, mean age: 46.7 ± 12.3 years) completed SLR, esophagogastric junction morphology was normal in 31 (36.5%), transient hiatal separation in 19 (22.3%), and consistently hiatal hernia in 35 (41.2%). The values of total acid exposure time (P = 0.016), longest acid reflux episodes (P = 0.024), and DeMeester scores (P = 0.016) were higher in hiatal hernia compared to patients with non-transient hiatal separation, but there were no differences between those with and without transient hiatal separation. Within ineffective esophageal motility, the presence of transient hiatal separation during SLR significantly associated with a higher total acid exposure time (P = 0.014), higher DeMeester scores (P = 0.019), higher total acid reflux events (P = 0.037), and higher longest acid reflux episodes (P = 0.006). Conclusion Our work suggests that SLR may have value as a provocative test during HRM, and future outcome studies are warranted to elucidate the clinical relevance of motor abnormalities depicted from SLR.
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Chien-Min Chen,Jae Hwan Lee,Meng-Yin Yang,Shang-Wun Jhang,Kai-Sheng Chang,Su-Wei Ou,Li-Wei Sun,Kuo-Tai Chen 대한척추신경외과학회 2023 Neurospine Vol.20 No.1
Objective: Sacroiliac joint (SIJ) pain is a common cause of chronic low back pain. Full-endoscopic rhizotomy of lateral branches of dorsal rami innervating SIJ is a potential option for patients’ refractory to medical treatment. The full-endoscopic rhizotomy is sometimes challenging under fluoroscopic guidance. This study is to evaluate the effectiveness of the navigation-assisted full-endoscopic rhizotomy for SIJ pain. Methods: The study was a retrospective match-paired study that enrolled consecutive patients undergoing navigation-assisted full-endoscopic rhizotomy for SIJ pain. The patient demographics, clinical outcomes, and operative parameters of endoscopic rhizotomy were compared with conventional cooled radiofrequency ablation (RFA) treatment. Results: The study enrolled 72 patients, including 36 patients in the endoscopic group. Thirty-six patients in the cooled RFA group were matched by age as the control. The follow-up time was at least 1 year. Patient characteristics were similar between the groups. The navigation-assisted endoscopic rhizotomy operation time was significantly longer than the cooled RFA. The visual analogue scale (VAS) for pain and Oswestry Disability Index (ODI) significantly decreased after each treatment. However, the between-group comparison revealed that the VAS and ODI of the patients after endoscopic rhizotomy were significantly lower than those after the cooled RFA group. There were no postoperative complications in the study. Conclusion: Navigation-assisted full-endoscopic rhizotomy is an alternative to SIJ pain treatment. Integrating intraoperative navigation can ensure accurate full-endoscopic rhizotomy to provide better durability of pain relief than the cooled RFA.
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LAUNCH TACTICS AND PRODUCT CANNIBALIZATION IN HIGH TECHNOLOGY MARKETS
Chien-Wei Chen,Nai-Hwa Lien 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.7
Product launch is perhaps the most important but risky phase in new product development process (Calantone & Montoya-Weiss, 1993). Product management at the launch phase aims to gain market acceptance, which, in turn, may maximize the chances of profitability (Guiltinan, 1999). One of the hidden, but real, threats for the vast majority of new product launches into a market is cannibalization, which refers to the process by which a new product gains a portion of its sales by diverting sales from an existing product (Harvey & Kerin, 1979;Lomax, Hammond, East, and Clemente, 1997; Traylor, 1986). High-technology markets are characterized by uncertainties that derive from market, technology, and competitive factors (Moriarty & Kosnik, 1989). Different information processing patterns among buyers are likely to emerge in high-technology markets (Capon and Glazer, 1987; Glazer, 1991). Accordingly, marketing strategies and tools are required to adapt to market environments. In response to environmental complexity and turbulence, marketers of high-tech products usually resort to marketing communications to assuage customers’ fear and doubt involved in product adoption (Lee and O’Connor, 2003). Such high-tech marketing practices, in a sense, illuminate signaling theory logic to mitigate uncertainty (Gulati and Higgins, 2003). Drawing on signaling theory, this research is to explore the circumstances under which launch tactics may result in salient product cannibalization. It is proposed that the cannibalization of product launch varies with the interactions between launch tactics and organizational/market factors. The findings of this research indicate that the cannibalization effect of price similarity will be greater for a launching firm possessing great product category strength. The cannibalization effects of preannouncing timing and price similarity tend to be greater in a highly competitive market context, as opposed to a low competitive context. Nevertheless, relative communication effort in support of product launch results in smaller cannibalization under a highly competitive condition. Product cannibalization derived by earlier preannouncements will become greater in a highly technologically turbulent market. This research contributes to the marketing and product management literature in two main respects. First, it represents an initial effort to empirically test the link between tactics in support of product launch and product cannibalization under different firm and market conditions. Second, we advance understanding of the cannibalization effects incurred by launch tactics by adopting a signaling approach. The fit between marketing strategy and its context has significant implications for new product performance, which should be captured in terms of the potential cannibalization between a new product and other products within the same firm, in addition to its sales and profitability. The findings may also offer guidelines for managing launch tactics. To make right decisions on developing appropriate tactics, the firms must accurately evaluate the firm and market characteristics and, simultaneously, take into account the amount of cannibalization caused by different tactics.
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LAUNCH TACTICS AND PRODUCT CANNIBALIZATION IN HIGH TECHNOLOGY MARKETS
Chien-Wei Chen,Nai-Hwa Lien 글로벌지식마케팅경영학회 2014 Global Marketing Conference Vol.2014 No.1
Product launch is perhaps the most important but risky phase in new product development process (Calantone & Montoya-Weiss, 1993). Product management at the launch phase aims to gain market acceptance, which, in turn, may maximize the chances of profitability (Guiltinan, 1999). One of the hidden, but real, threats for the vast majority of new product launches into a market is cannibalization, which refers to the process by which a new product gains a portion of its sales by diverting sales from an existing product (Harvey & Kerin, 1979;Lomax, Hammond, East, and Clemente, 1997; Traylor, 1986). High-technology markets are characterized by uncertainties that derive from market, technology, and competitive factors (Moriarty & Kosnik, 1989). Different information processing patterns among buyers are likely to emerge in high-technology markets (Capon and Glazer, 1987; Glazer, 1991). Accordingly, marketing strategies and tools are required to adapt to market environments. In response to environmental complexity and turbulence, marketers of high-tech products usually resort to marketing communications to assuage customers’ fear and doubt involved in product adoption (Lee and O’Connor, 2003). Such high-tech marketing practices, in a sense, illuminate signaling theory logic to mitigate uncertainty (Gulati and Higgins, 2003). Drawing on signaling theory, this research is to explore the circumstances under which launch tactics may result in salient product cannibalization. It is proposed that the cannibalization of product launch varies with the interactions between launch tactics and organizational/market factors. The findings of this research indicate that the cannibalization effect of price similarity will be greater for a launching firm possessing great product category strength. The cannibalization effects of preannouncing timing and price similarity tend to be greater in a highly competitive market context, as opposed to a low competitive context. Nevertheless, relative communication effort in support of product launch results in smaller cannibalization under a highly competitive condition. Product cannibalization derived by earlier preannouncements will become greater in a highly technologically turbulent market. This research contributes to the marketing and product management literature in two main respects. First, it represents an initial effort to empirically test the link between tactics in support of product launch and product cannibalization under different firm and market conditions. Second, we advance understanding of the cannibalization effects incurred by launch tactics by adopting a signaling approach. The fit between marketing strategy and its context has significant implications for new product performance, which should be captured in terms of the potential cannibalization between a new product and other products within the same firm, in addition to its sales and profitability. The findings may also offer guidelines for managing launch tactics. To make right decisions on developing appropriate tactics, the firms must accurately evaluate the firm and market characteristics and, simultaneously, take into account the amount of cannibalization caused by different tactics.
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Wei-Yi Lei,Tso-Tsai Liu,Wei-Chuan Chang,Chih-Hsun Yi,Jui-Sheng Hung,Ming-Wun Wong,Shu-Wei Liang,Lin Lin,Chien-Lin Chen 대한소화기 기능성질환∙운동학회 2024 Journal of Neurogastroenterology and Motility (JNM Vol.30 No.1
Background/AimsThis study aims to evaluate the effects of acute codeine administration on primary and secondary esophageal peristalsis in patients with ineffective esophageal motility (IEM). MethodsEighteen IEM patients (8 women; mean age 37.8 years, range 23-64 years) were enrolled in the study. The patients underwent high-resolution manometry exams, consisting of 10 single wet swallows, multiple rapid swallows, and ten 20 mL rapid air injections to trigger secondary peristalsis. All participants completed 2 separate sessions, including acute administration of codeine (60 mg) and placebo, in a randomized order. ResultsCodeine significantly increased the distal contractile integral (566 ± 81 mmHg∙s∙cm vs 247 ± 36 mmHg∙s∙cm, P = 0.001) and shortened distal latency (5.7 ± 0.2 seconds vs 6.5 ± 0.1 seconds, P < 0.001) for primary peristalsis compared with these parameters after placebo treatment. The mean total break length decreased significantly after codeine treatment compared with the length after placebo (P = 0.003). Codeine significantly increased esophagogastric junction-contractile integral (P = 0.028) but did not change the 4-second integrated relaxation pressure (P = 0.794). Codeine significantly decreased the frequency of weak (P = 0.039) and failed contractions (P = 0.009), resulting in increased frequency of normal primary peristalsis (P < 0.136). No significant differences in the ratio of impaired multiple rapid swallows inhibition and parameters of secondary peristalsis were detected. ConclusionsIn IEM patients, acute administration of codeine increases contraction vigor and reduces distal latency of primary esophageal peristalsis, but has no effect on secondary peristalsis. Future studies are required to further elucidate clinical relevance of these findings, especially in the setting of gastroesophageal reflux disease with IEM.
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Kuo-Tai Chen,Sung-Tai Wei,Chun Tseng,Su-Wei Ou,Li-Wei Sun,Chien-Min Chen 대한척추신경외과학회 2020 Neurospine Vol.17 No.sup.
With the trend of minimally invasive spine surgery, full-endoscopic lumbar discectomy (FELD) has evolved with the advancement of the optics and instruments. Regarding the techniques, the transforaminal and interlaminar approach remain the major accesses in FELD. Transforaminal endoscopic lumbar discectomy (TELD) is an effective and safe treatment for herniation of the lumbar disc. More and more evidence supports the TELD in enhancing recovery and decreasing surgical complications. However, the learning curve of TELD remains steep, especially at the L5–S1 level. The iliac crest height is an essential factor in the operability of TELD at the L5–S1 level. In the situation of the high iliac crest, TELD is technically challenging even for an experienced surgeon. Therefore, the authors report their techniques of TELD with foraminoplasty step-by-step and the preliminary results in this report.
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I Chun Ma,Kao Chin Chen,Wei Tseng Chen,Hsin Chun Tsai,Chien-Chou Su,Ru-Band Lu,Po See Chen,Wei Hung Chang,Yen Kuang Yang 대한정신약물학회 2018 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.16 No.4
Objective: Hospitalization of patients with delirium after visiting the emergency department (ED) is often required. However, the readmission risk after discharge from the ED should also be considered. This study aimed to explore whether (i) immediate hospitalization influences the readmission risk of patients with delirium; (ii) the readmission risk is affected by various risk factors; and (iii) the healthcare cost differs between groups within 28 days of the first ED visit. Methods: Using the National Health Insurance Research Database, the data of 2,780 subjects presenting with delirium at an ED visit from 2000 to 2008 were examined. The readmission risks of the groups of patients (i.e., patients who were and were not admitted within 24 hours of an ED visit) within 28 days were compared, and the effects of the severities of different comorbidities (using Charlson’s comorbidity index, CCI), age, gender, diagnosis and differences in medical healthcare cost were analyzed. Results: Patients without immediate hospitalization had a higher risk of readmission within 3, 7, 14, or 28 days of discharge from the ED, especially subjects with more severe comorbidities (CCI≥3) or older patients (≥65 years). Subjects with more severe comorbidities or older subjects who were not admitted immediately also incurred a greater healthcare cost for re-hospitalization within the 28-day follow-up period. Conclusion: Patients with delirium with a higher CCI or of a greater age should be carefully considered for immediate hospitalization from ED for further examination in order to reduce the risk of re-hospitalization and cost of healthcare.
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