• 대한수학회보
• /
• 제43권3호
• /
• pp.657-669
• /
• 2006

In this paper, we analyze a leaky bucket (LB) scheme with queue length dependent arrival rates. In other words, if the queue length exceeds an appropriate threshold value on buffer, the arrivals need to be controlled. In ATM networks, if the congestion occurs, the input traffics must be controlled (reduced) for congestion resolution. By the bursty and correlated properties of traffics, the arrivals are assumed to follow a Markov-modulated Poisson process (MMPP). We derive the loss probability and the waiting time distribution for arbitrary cell. The analysis is done by using the embedded Markov chain and supplementary variable method. We also present some numerical examples to show the effects of our proposed LB scheme.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
• /
• pp.423-426
• /
• 2005

Until now, the quantity to recycle wasted concrete as the great supplementary value was very little. But considering a insufficiency of the present state of aggregates, the recycling of wasted aggregates is indispensable. Recycled aggregate is useful resources for concrete, but its application to structural member is not frequently. In this an experimental study here in, this study is to reinforcement orientation containing fiber of the spun-concrete using recycled aggregate, evaluation of designed chlorine-ion and carbonation resistance. The result of study chlorine-ion resistance by using replacement ratios ($0.00\%,\;0.01\%,\;0.03\%,\;0.05\%,\;0.08\%$) of fiber which it more increase. Carbonated thickness of the spun-concrete used fiber and the normal spun-concrete was similar or it appeared with the tendency which it diminishes.

• Asian Journal of Innovation and Policy
• /
• 제5권2호
• /
• pp.185-196
• /
• 2016

A digital cable broadcasting service is a multimedia broadcasting service that provides high definition and various supplementary services by using digital transmission. Korea implemented a complete digital broadcasting service by 2012. This study applied a choice experiment to investigate consumer preferences, and it calculated the marginal willingness to pay for this service. Moreover, we employed a multinomial probit model to relax the assumption that all respondents have the same preference for attributes being valued. The results suggest that respondents value channels, definition, video-on-demand (VOD) service, pay-per-view (PPV) service, and commerce based on TV (T-commerce). On the other hand, online gaming may be less important as an attribute for digital cable broadcasting service in Korea.

• 한국정보통신학회:학술대회논문집
• /
• 한국해양정보통신학회 2004년도 춘계종합학술대회
• /
• pp.472-474
• /
• 2004

본 연구에서는 변형된 Folded 다이폴 안테나의 특성을 모멘트법을 이용하여 조사하였다. 안테나의 중심주파수는 200MHz, 도선의 반지름은 0.5mm이고 두 개의 선형 다이폴 사이의 간격은 2cm이다. 시뮬레이션 결과 18cm 정도의 내부 sub 변화와 4.5cm 정도의 외부 stub 변화는 SWR 기준으로 3 미만을 유지한다. 이는 변형된 Folded 다이폴 안테나가 추가적인 정합회로 없이 광대역 특성을 보이는 것을 의미한다.

• 한국임상수의학회지
• /
• 제38권1호
• /
• pp.36-40
• /
• 2021

A 12-year-old dog was referred due to multiple superficial lymphadenopathy. On cytology, each lymph node showed different cell populations where some of them consisted of intermediate to large lymphocytes with frequent Mott cells. Presence of Mott cells along with immature lymphocytes made the cytological diagnosis challenging, and therefore, supplementary diagnostic tests including PCR for Antigen Receptor Rearrangement (PARR) assay and flow cytometry were performed. This case report illustrates the value of flow cytometry in the diagnosis of lymphadenopathy with ambiguous cytologic findings.

• Structural Engineering and Mechanics
• /
• 제86권2호
• /
• pp.277-290
• /
• 2023

A supplementary reinforced concrete wall can be used to improve the seismic behavior of a buckling restrained braced frame as a mixed system. In such a novel system, the total lateral force is resisted by the combination of the RC wall system and the BRBF. There is not enough research on the response modification factor of such a mixed system. This paper investigates the response modification factor, and such relevant factors as ductility reduction factor and over strength factor for a system consisting of reinforced concrete wall and buckling restrained braced frame. To this purpose, nonlinear incremental dynamic analysis as well as static push over analysis are used for 6- to 14-story sample structures. The results show that for mixed considered systems, the mean value of response modification factor varies approximately from 7 to 9.

• Asia pacific journal of information systems
• /
• 제17권2호
• /
• pp.123-137
• /
• 2007

The advent of the Internet and related Web technologies has created an easily accessible link between a firm and its customers, and has provided opportunities to a firm to use information technology to support supplementary after-sale services associated with a product or service. It has been widely recognized that supplementary services are an important source of customer value and of competitive advantage as the characteristics of the product itself. Many of these supplementary services are information-based and need not be co-located with the product, so more and more companies are delivering these services electronically. Net-based customer service, which is defined as an Internet-based computerized information system that delivers services to a customer, therefore, is the core infrastructure for supplementary service provision. The importance of net-based customer service in delivering supplementary after-sale services associated with product has been well documented. The strategic advantages of well-implemented net-based customer service are enhanced customer loyalty and higher lock-in of customers, and a resulting reduction in competition and the consequent increase in profits. However, not all customers utilize such net-based customer service. The digital divide is the phenomenon in our society that captures the observation that not all customers have equal access to computers. Socioeconomic factors such as race, gender, and education level are strongly related to Internet accessibility and ability to use. This is due to the differences in the ability to bear the cost of a computer, and the differences in self-efficacy in the use of a technology, among other reasons. This concept, applied to e-commerce, has been called the "e-commerce divide." High Internet penetration is not eradicating the digital divide and e-commerce divide as one would hope. Besides, to accommodate personalized support, a customer must often provide personal information to the firm. This personal information includes not only name and address, but also preferences information and perhaps valuation information. However, many recent studies show that consumers may not be willing to share information about themselves due to concerns about privacy online. Due to the e-commerce divide, and due to privacy and security concerns of the customer for sharing personal information with firms, limited numbers of customers adopt net-based customer service. The limited level of customer adoption of net-based customer service affects the firm profits and the customers' welfare. We use a game-theoretic model in which we model the net-based customer service system as a mechanism to enhance customers' loyalty. We model a market entry scenario where a firm (the incumbent) uses the net-based customer service system in inducing loyalty in its customer base. The firm sells one product through the traditional retailing channels and at a price set for these channels. Another firm (the entrant) enters the market, and having observed the price of the incumbent firm (and after deducing the loyalty levels in the customer base), chooses its price. The profits of the firms and the surplus of the two customers segments (the segment that utilizes net-based customer service and the segment that does not) are analyzed in the Stackelberg leader-follower model of competition between the firms. We find that an increase in adoption of net-based customer service by the customer base is not always desirable for firms. With low effectiveness in enhancing customer loyalty, firms prefer a high level of customer adoption of net-based customer service, because an increase in adoption rate decreases competition and increases profits. A firm in an industry where net-based customer service is highly effective loyalty mechanism, on the other hand, prefers a low level of adoption by customers.

• 한국식품과학회지
• /
• 제33권4호
• /
• pp.451-454
• /
• 2001

맛과 향기가 뛰어나고 고혈압 예방의 효과가 있어 식용으로 널리 이용되는 양송이(Agaricus bisporus)를 첨가한 고품질 어묵을 제조하여 색조 변화, 물성 특성 및 관능적 특성을 조사하였다. 양송이의 함유량이 증가할수록 어묵의 색도변화는 L값은 감소하는 경향, a값은 증가하는 경향, b값은 유의차가 없는 경향을 나타내었다. 또한, 어묵의 유연성을 나타내는 절곡검사의 결과로는 모든 시료에서 AA로 측정되어 양송이의 첨가에 관계없이 우수한 것으로 나타났다. 물성검사 결과에서, 양송이가 첨가될수록 어묵의 경도, 탄성, 껌성 및 파쇄성이 증가되었으며, 강도는 유의차가 보이지 않았다. 관능검사의 결과로 전체적인 선호도는 10%의 양송이를 함유한 어묵이 가장 높았다. 이상의 결과로 양송이를 함유한 고품질 어묵의 제조 가능성을 확인하였다.

• Investigative Magnetic Resonance Imaging
• /
• 제6권1호
• /
• pp.28-34
• /
• 2002

목적 : Event-related fMRl를 위한 통계학적 자극설계에서 최소 자극간격(Minimum Stimulus Onset Asynchronoy: SOAmin)은 중요한 요소로 알려져 있다. 본 연구에서는 통계학적 자극설계를 이용한 event-related fMRI에서 언어과제와 운동과제의 보다 큰 활성화 신호를 얻기 위한 치적의 SOAmin을 알아보고자 하였다. 대상 및 방법 : 4명의 오른손잡이 정상 자원자를 대상으로 운동과 언어의 event-related fMRI를 얻었다. 기능적 자기공명영상은 1.5T기기에서 EPI-BOLD시퀀스를 사용하였다. 각 과제에서 SOAmin을 2, 3, 4, 6초로 달리한 4회의 자극을 이용하여 활성화를 유도하였다. 영상 후 처리는 SPM99를 이용하였으며 활성화 신호의 유의수준은 p<0.05를 기준으로 하였다. 각 과제에서 나타난 활성화 신호를 Z값, 활성화된 화소수와 군집성을 기준으로 비교하였다. 결과 : 운동과제에서는 중심구(1차 운동영역)와 내전두엽(2차 운동영역)에서 활성화 신호가 나타났고, 언어과제에서는 좌측 하전두회 (Broca영역)에서 일정한 활성화 신호가 나타났다. 운동과 언어과제에서 활성화 신호는 SOAmin이 작아질 수록 커지는 경향을 나타내었다. 운동과제에서 1차 운동영역의 활성화 신호는 3초, 2차 운동영역에서는 2초의 SOAmin을 적용한 경우 가장 큰 활성화 신호가 나타났고, 언어과제에서는 2초의 SOAmin을 적용한 경우 가장 큰 활성화 신호가 나타났다. 결론 : 통계학적 자극설계를 이용한 event-related URI로 운동과 언어의 기능적 자기공명영상을 얻기 위해서는 2초 또는 3초의 짧은 SOAmin이 효과적이었다.

• Journal of Preventive Medicine and Public Health
• /
• 제10권1호
• /
• pp.150-154
• /
• 1977

In the diagnosis of parasitic helminthic diseases, the value of examining and identifying the parasitic eggs and/or adult parasites from patient's urine or stool are well appreciated. However, these methods have a limited value in the diagnosis of tissue or intracellular parasitism, and we have to rely on supplementary methods such as immune-serological test. The author tested the value of gel precipitation reactions as a diagnostic method of clonorchiasis by observing the appearance of bands in rats experimentally infected with Clonorchis sinensis, And the therapeutic effect of CIBA 35'058-Ba was evaluated by this serological method. The antigen was prepared from the adult worms infected in rabbits by Tsuji method. Rats infected with 40 metacercariae each were bled on 7,14,21,26,28,39,42(43),49(53) days after infection to observe the appearance of precipitin bands by both Oucterlony method and immunoelectrophoresis. Fifteen rats were separately infected and treated with CIBA 35'058-Ba in dose of 15mg/kg of body weight. The following results were obtained: 1. It was observed that there exist individual variations in the appearance of the first precipitin band with the range of 2-4 weeks after infection. 2. The number of precipitin bands was increased until 6-7 weeks after infection. In all cases, 3 precipitin bands were appeared by Oucterlony method and 6-7 bands were appeared by immunoelectrophoresis after 6-7 weeks of infecion. 3. It was hardly possible to notice any change in the number of bands after the administration of CIBA 35'058-Ba. This result suggested that the drug has no effect on clonorchiasis which was confirmed by the autopsy of the experimental rats.