• The Journal of Society for e-Business Studies
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• v.15 no.2
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• pp.205-217
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• 2010

IPTV Service was launched with great expectation, but it is having difficulty due to the low number of subscribers and contents. In addition, the study of IPTV is still in its infancy and most of previous studies are only focused how IPTV is adopted and spread. In this study, we defined that resistance is the users not tend to accept IPTV service, and analyzed factors affecting resistance which are Innovative characteristics, User characteristics, Service characteristics and proposed implications for IPTV service vitalization. The results that relative advantage, complexity, attitude of an existing product, contents, cost, innovativeness have significant effects on resistance to IPTV.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.656-659
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• 2001

Cyclodextrin glucanotransferase (CGTase) (EC 2.4.1.19) use starch to produce cyclic maltooligosaccharides (cyclodextrins, CDs) which are of interest in various applications. To obtain a novel CGTase having high CD-forming activity, ${\beta}-cyclodextrin$ glucanotransferase $({\beta}-CGTase)$ from Bacillus firmus var. alkalophilus was modified through site-directed mutagenesis and constructed five mutants, H59T, H59Q, Y96M, 9O-PPI-93, and ${\Delta}(148-154)D$, respectively. Y96M and ${\Delta}(148-154)D$ showed much higher level of conversion yields of starch into CDs from 28.6% to about 39% compared to wild-type ${\beta}-CGTase$, respectively, but 90-PPI-93 maintained similar convesion yields of starch to CDs. And their ${\beta}-CD$ ratios to total CDs were not changed and maintained, and convesion yields to linear maltooligosaccharides of all mutants were not changed significantly. These results indicates that five mutations of ${\beta}-CGTase$ from Bacillus firmus var. alkalophilus appears to be important roles for increase of overall CD production rather than change of its product specificity, especially.

• Biomolecules & Therapeutics
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• v.7 no.4
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• pp.354-361
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• 1999

In this study, the effects of tauroursodeoxycholic acid (TUDCA) on ischemia/ reperfusion injury were investigated on isolated heart perfusion models. Hezrts were perfused with oxygenated Krebs-henseleit solution (pH 7.4, $37^{\cire}C$) on a Langendorff apparatus. After equilibration, isolated hearts were treated with TUDCA 100 and 200 $\mu\textrm{M}$ or vehicle (0.02% DMSO) for 10 min before the onset of ischemia in single treatment group. In 7 day pretreatment group. TUDCA 50, 100 and 200 mg/kg body weight were given orally for 7 days before operation. After global ischemia (30 min), ischemic hearts were reperfused for 30 min. The physiological (i.e. heart rate, left ventricdular developed pressure, coronary flow, double product, time to contracture formation) and biochemical (lactate dehydrogenase; LDH) parameters were evaluated. In vehicle-treated group, time to contracture formation was 810 sec during ischemia, LVDP was 34.0 mmHg at the endpoint of reperfusion and LDH activity in total reperfusion effluent was 34.3 U/L. Single treatment with TUDCA did not change the postischemic recovery of cardiac function, LDH and time to contractur compared with ischemic control group. TUDCA pretreatment showed the tendency to decrease LDH release and to increase time to contracture and coronary flow. Our findings suggest that TUDCA does not ameliorate ischemia/reperfusion-reduced myocardial damage.

• Journal of Information Technology Applications and Management
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• v.11 no.4
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• pp.181-208
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• 2004

By the developing of Internet. the environments of the company have rapidly been changed. Especially. managers in the Internet shoppingmall have been try to provide excellent e-Services to their customers. e-Service i~ defined comprised of all interactive services that are delivered on the Internet uSing advanced telecommunications. information, and multimedia technologies. but according to study of e-Satisfy. com［2000］. customer service through internet is still neither effective nor efficient and poor service will impact on company's profit but excellent service can improve their value and quality of the service or product. In order to customer-oriented e-Services. this study suggested the QFD linked with e-Service quality model for the Internet shoppingmall service system. which can help determine design characteristics being relevant to customer's e-Service quality requirements. this hybrid model have two stages. In the first stage. we do measure service quality and find priorities of service quality attribute by purchase process. and in the second stage. on the basis of priority of e-Service quality attributes, we find design characteristics to maximize customer satisfaction. From this study, we provide internet shoppingmall managers with the implications for improvement of service quality, measuring quality of e-service, providing design characteristics for customer-oriented service quality.

• Journal of the Korean Society of Manufacturing Technology Engineers
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• v.26 no.1
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• pp.6-12
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• 2017

In a large 3D printer when the cooler, which cools the filament, acts in one direction, the area directly exposed to the cooling is cooled to the proper temperature. However, the cooling effect on the opposite area is relatively less. It was found in experiments that filaments with a thickness of over 2 mm exhibit the cooling problem in one directional cooling. Consequently, cooling was performed to prevent the flow-down and to produce firm support leading to an improvement in product quality in extrusion. Further, the lay-up of a 3D printer with five guides combined with a duct was achieved. Analysis showed that the improvement in the cooling effect enables stable extrusion and lay-up and thus, reduces fabrication time.

• Korean journal of food and cookery science
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• v.26 no.5
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• pp.511-520
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• 2010

The purpose of this article was to study how the 7Ps influence consumers' risk perception of eating at family restaurants in Seoul. In this study, frequency analysis, reliability analysis, factor analysis and path analysis (SEM) of the data were performed. First, reliability analysis confirmed that the 7Ps performance and risk data could be used in this investigation. Path analysis showed that the 7Ps significantly influenced customers' risk perception of eating at restaurants in Seoul. According to the results, product negatively influenced performance risk (p<0.05) and financial risk (p<0.001); price negatively influenced performance risk (p<0.001), financial risk (p<0.001), and time risk (p<0.01); place negatively influenced performance risk (p<0.01) and time risk (p<0.001); promotion negatively influenced financial risk (p<0.05) and time risk (p<0.001); process negatively influenced performance risk (p<0.001) and time risk (p<0.001); physical evidence negatively influenced performance risk (p<0.05) and financial risk (p<0.001); and people negatively influenced performance risk (p<0.05), financial risk (p<0.001), and time risk (p<0.001). As a result, we confirmed that 7Ps were an effective marketing tactic for reducing consumers' risk perception of eating at restaurants. Therefore, family restaurant companies are recommended to administer the 7Ps without additional cost.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.585-588
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• 2005

Many process parameters have an effect on the auto-body panel forming process. A well designed blank shape causes the material to flow smoothly, reduces the punch and yields a product with uniform thickness distribution. Therefore, the determination of an initial blank shape plays the important role of saving time and cost in the auto-body panel forming process. For these reasons, some approaches to estimate the initial blank shape have been implemented, in this paper The one-step approach using a finite element inverse method will be introduced to predict the optimal forming with changing of blank pressure the developed program is applied to auto-body panel forming.

• Journal of Distribution Research
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• v.4 no.2
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• pp.21-39
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• 1999

This study investigates the general applicability of the measurement scale for assessing channel-member performance for the supplier's view that was proposed by Kumar, and Achrol (1992). First, we attempted to examine whether the measurement-scale could be used without any change; the results from the initial data-analysis proposed that the scale needed a certain amount of a revision for further utilization. It seemed that the scale needed some adjustment for being applied to this study; their scale was developed with the data collected from the network of independent dealers handling multiple product items or multiple brands in the U.S. and Canada, while the data of this study were provided by a Korean car manufacturer having a dealer network selling and servicing only its own brand without ownership. Accordingly, we determined that it was necessary to develop a newly finalized performance-measurement scale revising Kumar et al.'s. During the data-analysis of the data resulted in a scale of fifteen items measuring three facets-financial performance, behavioral performance, and competence, each of which consisted of five items respectively. This empirically developed scale looked more valid for the situation of this study than the Kumar, Stern, and Achrol's which was composed of twenty-one items measuring seven facets--three items each.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2005.05a
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• pp.629-638
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• 2005

In this paper, we consider two issues in collaborative filtering, which are closely related with the number of ratings of a user. First issue is the relationship between the number of ratings of a user and the performance of collaborative filtering. The relationship is investigated with two datasets, EachMovie and Movielens datasets. The number of ratings of a user is critical when the number of ratings is small, but after the number is over a certain threshold, its influence on recommendation performance becomes smaller. We also provide an explanation on the relationship between the number of ratings of a user and the performance in terms of neighborhood formations in collaborative filtering. The second issue is how to select an initial product list for new users for gaining user responses. We suggest and analyze 14 selection strategies which include popularity, favorite, clustering, genre, and entropy methods. Popularity methods are adequate for getting higher number of ratings from users, and favorite methods are good for higher average preference ratings of users.

• Journal of the Korean Society for Precision Engineering
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• v.29 no.5
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• pp.500-505
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• 2012

Recently, a high speed spindle is an essential part of machine tools to satisfy latest demand of high precision product and machining of hard materials. But, there are many disadvantages such as heat generation of built-in-motor, bearing friction, noise, vibration and displacement because of the high speed. Many researches on spindle systems have been conducted for solving these problems. In this study, technical trend of machine tools spindle systems are analyzed with patent PSM, mapping and grouping. The analysis is carried out for the applied patent during January 2000 and December 2009 in Korea, Japan, EU and U.S.A. And development of the direction, strategy and promising technologies of the spindle system are suggested.