• Journal of Veterinary Clinics
• /
• v.27 no.3
• /
• pp.209-215
• /
• 2010

Canine coronavirus (CCV) is a cause of sporadic outbreaks of enteritis in dogs. This study was performed to carry out epidemiological investigation on the recent outbreaks of CCV enteritis of dogs and determined the potential prognostic factors affecting the survival of dogs. The 131 (34.4%) out of 381 fecal samples collected from dogs with enteritis were positive for CCV by RT-PCR. The fecal samples contained genotype I (30.5%), genotype II (29.0%), and both genotypes (40.5%) of CCV. The majority of dogs with CCV infection ranged 6-18 weeks of age. Age over 18 weeks was significantly associated with higher survival rate (P < 0.05). Of the clinical signs examined, dogs without anorexia were significantly higher survival rate (P < 0.01). The 90.1% of dogs with CCV infection were co-infected by CCV and CPV-2. From the results of this study, it can be concluded that CCV infection is widespread in the Korean dog population and CCV may be attributed to be one of the important agents causing enteritis in pups.

• Journal of Veterinary Clinics
• /
• v.24 no.4
• /
• pp.493-498
• /
• 2007

The purposes of this study were to survey the seroprevalence of canine coronavirus(CCV) in healthy adult dogs and to determine whether there was any relationship between seroprevalence and the host parameters. Serum samples for determination of serum neutralization antibody titers against CCV were obtained from 812 healthy adult dogs over 1 year old brought to veterinary clinics for routine health care visit in 4 provinces from January 2003 to April 2004. Of the 812 dogs, 714(87.9%) had positive antibody titers(more than 1:4) against CCV. The prevalence of positive CCV antibody titers were not significantly associated with age, sex, rearing province and environment, and vaccination status. However, the positive CCV antibody titers were increasing with the age. These serological findings have shown that prevalence of positive CCV antibody titers in Korean dogs were a relatively high and that CCV infection was widespread in Korean dog population. These suggest that it may be as important to protect dogs against infection with CCV as it is to vaccinate against canine parvovirus.

• Proceedings of the Korea Multimedia Society Conference
• /
• 1998.04a
• /
• pp.40-45
• /
• 1998

칼라 히스토그램의 단점을 보완할 수 있는 CCV(Color Coherence Vector) 방법이 소개되었다. CCV는 구현이 쉽고, 칼라 히스토그램과 달리 같은 색상 분포를 가지는 다른 영상을 구별하는 것이 가능하다. 그러나, CCV는 계산량이 많아 많은 처리 시간이 요구된다. 본 논문에서는 효율적인 계산을 위하여 N$\times$M-grams과 계층적인 검색 방법을 이용하여 처리 시간을 줄이는 검색 방법을 제시한다. 먼저, 영상의 구조적 특징을 잘 반영하는 N$\times$M-grams를 사용하여 주어진 질의 영상과 같은 부류(category)에 속하는 모든 영상들을 찾는다. 그리고, 찾은 영상들만을 대상으로 CCV를 계산하여 검색한다. 200개의 영상을 가지고 실험한 결과, 검색율은 약 79%이고, CCV만을 사용한 방법보다 시간이 약 37% 감소하였다.

• Korean Journal of Veterinary Research
• /
• v.45 no.2
• /
• pp.215-221
• /
• 2005

Canine coronavirus (CCV) causes a mild gastroenteritis in dogs. The virus is highly contagious. Although the virus was isolated more than thirty years ago, canine coronavirus infection continues to be a widespread problem. Mixed infections with both CCV and canine parvovirus (CPV) are common. Four kinds of commercial killed CCV vaccines are available in Korea. All the commercial vaccines should pass the National Assay for Veterinary Biologicals prior to release. For the potency test of CCV vaccine, it is necessary to use CCV antibody free dogs. The test requires not only kennels but high cost. To develop easy, efficient and economic potency test method for killed CCV vaccine using laboratory animals, a series of experiments with rabbits and guinea pigs were carried out in this study. In the preliminary test, the guinea pigs showed better immune responses than rabbits. The guinea pig was also easy to manage. So guinea pig was selected for the potency test animals. When the guinea pigs were inoculated twice with one dose of vaccine intramuscuarly each, slower and a little lower SN antibody titers were induced in guinea pigs than in dogs (about 2 kg body weight Beagle strain) given the same posology as guinea pigs'. It was concluded that guinea pigs could be substituted for dogs in the potency test of killed CCV vaccine.

• 제어로봇시스템학회:학술대회논문집
• /
• 1994.10a
• /
• pp.271-276
• /
• 1994

In this paper we deal with a design of CCV adaptive flight control system having adaptive observer under the mircroburst circumstances. First, based on the observerbility indices of the controlled system, which is a general multi-variable one, the adaptive observer is constructed, and the unknown interactor matrix can be estimated by using the identified parameters. Next, CCV adaptive flight control law is calculated based upon the estimated ones. Finally, the proposed CCV adaptive flight controller is applied to STOL flying boat and numerical simulations under the microburst circumstances can be show to justify the proposed scheme.

• Korean Journal of Veterinary Research
• /
• v.34 no.3
• /
• pp.517-527
• /
• 1994

An attempt was made to isolate a causative viral agents from the fecal specimens of the diseased dogs with the gastroenteritis symptoms. Two coronavirus-like agents were isolated by serial dilution end point method and plaque assay. The isolates were characterized in terms of cytopathology, antigenicity, replication, physicochemical and morphological properties. The results obtained through the experiment were as follows; 1. Among 7 fecal specimens collected from the dogs with enteric disease, 2(28.6%)coronavirus-like agents showing typical cytopathic effects of canine coronavirus were isolated, and designated as CCV D1 and CCV D2, respectively. 2. By the cross-neutralization test and indirect immunofluoresence antibody test, the isolates were antigenically indentified as the standard CCV. The viruses were replicated only in the cytoplasm of A-72 cells. 3. The isolates showed no haemagglutinating activity against the erythrocytes from 11 kinds of animals. 4. The electron microscopic observation for the isolates showed spherical and pleomorphic features, covered with club-shaped projections on the surface. The size of particles was ranged from 70 to 150nm. 5. In one-step growth curve for the isolates in A-72 cells, maximum titers of intracellular vius was $10^{4.6}$ $TCID_{50}/0.1ml$ at 46 hrs postinoculation(pi) of CCV Dl and $10^{4.4}$ $TCID_{50}/0.1ml$ at 34 hrs pi of CCV D2. The maximum titers of extracellular virus was $10^{5.5}$ $TCID_{50}/0.1ml$ at 58 hrs pi of CCV D1 and $10^{5.8}$ $TCID_{50}/0.1ml$ at 46 hrs pi of CCV D2. 6. In physicochemical property test, the isolates were very sensitive to choroform and were found to be RNA virus. The viruses was stable at pH 3.0 for 1 hr and at $22{^{\circ}C}$ for 5 hrs. However, infectivity titers reduced remarkably by treatment with $56{^{\circ}C}$ for 10min.

• Proceedings of the Korean Information Science Society Conference
• /
• 2000.10c
• /
• pp.659-661
• /
• 2000

폰 노이만 모델의 지역성과 데이터플로우 모델의 병렬성을 결합하여 등장한 모델이 다중 스레드 모델이다. 다중스레드 모델의 목적은 통신시간과 계산 시간을 겹침으로써 프로세서의 활용도를 높이고자 하는 것이다. 기존의 대부분의 다중 스레드 모델의 스레드 스케쥴링 기법은 FIFO 혹은 FILO 방식을 사용하고 있다. 본 논문에서는 프로세서의 활용도를 높이고 프로세서의 휴지 시간을 줄이기 위해서 원격 함수 호출 혹은 원격 메모리 참조 기능의 스레드(이후로는 원격 스레드라 부름)와 계산 기능의 스레드가 동시에 활성화되었을 때 원격 스레드들을 먼저 수행하는 것이 프로세서의 지연 시간을 줄이고 병렬성을 높이는 데 효과적임을 제안한다. 이것을 구현하기 위해서 프레임 내부의 지속 벡터(CV)를 CCV(call continuation vector)와 LCV(local continuation vector) 둘로 구분하였다. 스레드가 활성화될 때 CCV에는 원격 스레드들을, LCV에는 계산 스레드들을 저장한 후, CCV에 저장된 스레드들을 먼저 수행하고 LCV를 나중에 수행한다.

• Proceedings of the Korea Multimedia Society Conference
• /
• 1998.04a
• /
• pp.28-33
• /
• 1998

대량의 영상데이터베이스에서 질의영상에 대한 유사영상을 검색할 때의 유사도 계산을 위한 시간소모는 영상의 실시간 검색효율을 저하시키는 요인이 된다. 본 논문에서는 키영상(key image)을 이용하여 영상데이터베이스의 각 영상과 키영상의 유사도를 미리 계산해 둠으로써 질의영상과 데이터베이스 영상간의 유사도 계산시간을 단축시킨다. 그리고 검색효율을 높이기 위해 1차적으로 칼라특징으로 유사영상들을 분류한 후, 1차 분류된 영상들만을 대상으로 계층적으로 질감특징값으로 영상을 비교함으로써 검색효율을 상승시킨다. Oracle 데이터베이스 상에서 본 계층적 내용기반 영상검색시스템을 구현하였다.

• Defense and Technology
• /
• no.3 s.51
• /
• pp.10-17
• /
• 1983

• Journal of Mechanical Science and Technology
• /
• v.20 no.7
• /
• pp.981-992
• /
• 2006

In this paper, a lateral vehicle control using the concept of control configured vehicle (CCV) is presented. The control objectives for the lateral dynamics of a vehicle include the ability to follow a chosen variable without significant motion change in other specified variables. The analysis techniques for decoupling of the aircraft motions are utilized to develop vehicle lateral control with advanced mode. Vehicle lateral dynamic is determined to have the steering input and control torque input. The additional vehicle modes are also defined to using CCV concept. We use right eigenstructure assignment techniques and command generator tracker to design a control law for an lateral vehicle dynamics. The desired eigenvectors are chosen to achieve the desired decoupling (i.e., lateral direction speed and yaw rate). The command generator tracker is used to ensure steady-state tracking of the driver's command. Finally, the developed design is utilized by using the lateral vehicle dynamic with four wheel.