• 대한수의학회지
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• 제24권1호
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• pp.91-98
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• 1984

A total of 466 foremilk from dairy farms in Chonnam district was examined for the subclinical mastitis over a period of one year, using a method of the electrical conductivities(EC); absolute conductivity(AC) and differential conductivity(DC) and quarter difference value(QD), in relation to the California mastitis test(CMT) and the direct somatic cell count(DSCC). The compatibility and efficiency rating between the EC values and the other screening tests was conducted. Obtained results are summarized as follows. 1. A linear relationship was found between the EC values and the CMT scores and direct somatic cell counts and it was found that electrical conductivity measurements were comparable with other screening tests for diagnosing animals with mastitis. 2. Compatibilities between the EC and CMT were 70.4% in AC, 74.6% in DC and 70.7% in QD, and that of the EC and DSCC were 53.0% in AC, 63.1% in DC and 53.2% in QD. On the other hand, relative efficiency ratings of Postle's equation between EC and CMT were 37.3% in AC, 26.5% in DC and 13.6% in QD, and that of the EC and DSCC were 33.1% in AC, 20.2% in DC and 11.9% in QD. 3. In the foremilk samples collected from damaged quarters determined by EC, the false positive rate wart higher than the false negative rate, and consequently tests of EC produced lower compatibility or efficiency rating scores. These tendencies suggested that any factors other than the mastitic condition influencing the EC values might be existed.

• 한국항공우주학회지
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• 제33권8호
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• pp.99-104
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• 2005

인공위성에서 구조체의 역할은 발사환경 및 궤도상의 모든 발생 가능한 환경에서 위성체를 안전하게 지지하는 것이다. 인공위성의 개발단계에서 구조 및 열 개발모델은 유한요소모델 보정 및 구조강도/특성 확인 등의 구조적인 특징과 열평형시험을 통한 열적 안정성의 확인을 그 목적으로 한다. 이때 얻어진 결과는 실제 비행모델의 개발 시 구조 및 열적 안정성 검증 등의 중요한 자료로써 활용된다. 본 논문에서는 고정밀 지구관측위성의 구조 및 열 개발모델에 대해 구조 관점에서의 설계/해석에 대해 기술하고 또한 모달 시험을 통한 시험결과와 유한요소해석과의 비교에 대해 기술한다.

• 한국정보과학회논문지:소프트웨어및응용
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• 제35권2호
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• pp.59-69
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• 2008

자동화된 obfuscation은 보안 목적으로 코드를 이해하기 어렵게 만들어 역공학 공격을 방어하는데 가장 효과적인 방식이라고 알려져 있다. 본 논문에서는 역공학 공격과 같은 소프트웨어 지적재산권의 침해로부터 마이크로소프트사의 비주얼 C++ 소스 프로그램을 보호하기 위한 obfuscation 기법을 제안하고 구현하였다. 즉, 원본 비주얼 C++ 소스 프로그램을 기능은 동일하지만 이해하기에는 훨씬 힘든 또 다른 프로그램으로 변환시켜 주는 도구인 코드 obfuscator를 구현하였다. 비주얼 C++ 소스를 다루기 위해 ANTLR이라는 파서 생성기를 도입하여, '주석 제거', '식별자 스크램블', '변수 분할', '배열 중첩', '클래스 삽입', '루프 조건 확장'. '부가 피연산자 삽입', '무의미 코드 삽입' 등의 변환 방식들을 구현하였다. 또한, 복잡도, 복원력, 비용 등의 측면에서 본 obfuscator의 성능과 유효성을 평가하였다. 원본 소스 코드와 비교하여 실험한 결과, 변환된 소스 코드가 실행시간 오버헤드를 일부 유발시키긴 하지만 프로그램 보호에는 효과적임을 알 수 있었다.

• 한국가금학회지
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• 제34권4호
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• pp.301-318
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• 2007

Marek's disease (MD) is a highly contagious lymphoproliferative disease of poultry caused by the oncogenic herpesvirus designated Marek's disease virus (MDV). MD has a worldwide distribution and is thought to cause an annual loss over US$ one billion to the poultry industry. Originally described as a paralytic disease, today MD is mostly manifested as an acute disease with tumors in multiple visceral organs. MD is controlled essentially by the widespread use of live vaccines administered either in ovo into 18-day-old embryos or into chicks immediately after they hatch. In spite of the success of the vaccines in reducing the losses from the disease in the last 30 years, MDV strains have shown continuous evolution in virulence acquiring the ability to overcome the immune responses induced by the vaccines. During this period, different generations of MD vaccines have been introduced to protect birds from the increasingly virulent MDV strains. However, the virus will be countered each new vaccine strategy with ever more virulent strains. In spite of this concern, currently field problem from MD is likely to be controled by strategy of using bivalent vaccine. But, potential risk factors for outbreak of MD are still remained in this condition. The major factors can be thought that improper handling and incorrect administration of the vaccine, infection prior to establishment of immunity, suppression of immune system by environmental stress and outbreaks of more virulent MDV strain by using vaccine and genetic resistance of host.

• 산업경영시스템학회지
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• 제40권4호
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• pp.87-95
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• 2017

This study aims to configure what dimensions make up for smart phone after service quality, and how this service quality affects customer satisfaction and customer loyalty. Smart phone market is a market of the device leading the digital convergence as well as positioning itself as one of the national growth driving industry. To survive in this matured market, companies should have to respond actively to radical changes and customers needs in the so-called Smart Revolution environment. Lately, however, the smart phone market is prospected to move from growth phase to mature phase by the scholars. In order to proactively respond to the change in such market condition, companies need to provide absolute advantage in customer loyalty over their competitors by revolutionizing the after-sales service quality. Qualified A/S will lead to service satisfaction and achieve customer loyalty. The empirical analysis results obtained through A/S quality are as follows : First, human quality (attitude, expertise, problem-solvability), environment quality (handling agility, convenience, comfort), service policy quality (quality guarantee, additional service operation) are dimensions that make up for A/S quality. Second, A/S quality dimension showed a significant positive influence on service satisfaction and A/S satisfaction showed a positive influence on customer loyalty as well. Based on this empirical study, we propose some implications for A/S quality improvement. First, human quality dimension has relatively higher influence on A/S satisfaction in case of free A/S, so companies need to solve the product problem completely when consumer's first visit by continual employee education. Second, in case of paid A/S, the service policy quality-especially A/S Warranty period- has higher influence on A/S satisfaction.

• 한국환경과학회지
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• 제19권6호
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• pp.715-735
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• 2010

This study is designed to assess the priority order of the chemicals to cause to generate occupational diseases in order to understand the fundamental data required for the preparation of health protective measure for the workers dealing with chemicals. The 41 types of 51 ones of chemicals to cause to generate the national occupational diseases were selected as the study objects by understanding their domestic use or not, and their occupational diseases' occurrence or not among 110,608 types of domestic and overseas chemicals. To assess their priority order the sum of scores was acquired by understanding the actually classified condition based on a perfect score of physical riskiness(90points) and health toxicity(92points) as a classification standard by GHS, the priority order on GHS riskiness assessment, GHS toxicity assessment, GHS toxic xriskiness assessment(sum of riskiness plus toxicity) was assessed by multiplying each result by each weight of occupational disease's occurrence. The high ranking 5 items of chemicals for GHS riskiness assessment were turned out to be urethane, copper, chlorine, manganese, and thiomersal by order. Besides as a result of GHS toxicity assessment the top fives were assessed to be aluminum, iron oxide, manganese, copper, and cadium(Metal) by order. On the other hand, GHS toxicity riskiness assessment showed that the top fives were assessed to be copper, urethane, iron oxide, chlorine and phenanthrene by order. As there is no material or many uncertain details for physical riskiness or health toxicity by GHS classification though such materials caused to generate the national occupational diseases, it is very urgent to prepare its countermeasure based on the forementioned in order to protect the workers handling or being exposed to chemicals from health.

• 농업과학연구
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• 제38권4호
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• pp.747-752
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• 2011

Wireless technology has enabled farmers monitor and control protected production environment more efficiently. Utilization of USN (Ubiquitous Sensor Network) devices also brought benefits due to reduced wiring and central data handling requirements. However, wireless communication loses signal under unfavorable conditions (e.g., blocked signal path, low signal intensity). In this paper, performance of commercial wireless communication devices were evaluated for application to protected crop production. Two different models of wireless communication devices were tested. Sensors used in the study were weather units installed outside and top of a greenhouse (wind velocity and direction, precipitation, temperature and humidity), inside ambient condition units (temperature, humidity, $CO_2$, and light intensity), and irrigation status units (irrigation flow and pressure, and soil water content). Performance of wireless communication was evaluated with and without crop. For a 2.4 GHz device, communication distance was decreased by about 10% when crops were present between the transmitting and receiving antennas installed on the ground, and the best performance was obtained when the antennas were installed 2 m above the crop canopy. When tested in a greenhouse, center of a greenhouse was chosen as the location of receiving antenna. The results would provide information useful for implementation of wireless environment monitoring system for protected crop production using USN devices.

• 한국지역사회생활과학회지
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• 제16권4호
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• pp.103-114
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• 2005

This study aims to lay the foundations for domestic welfare through solving domestic problems. The major results of this study were as follows: First, there are many domestic violence facilities, but their poor financial condition and lack of human resources make it difficult to meet all need of shelter users. Second, people who use domestic violence shelters can't receive proper care and they go back to their homes in which violence still remains. It is like a vicious cycle making their situation worse and worse. Third, counseling given to abused women in shelters is arranged individually or in groups, but there are not enough programs providing proper care for them. On the basis of the realities mentioned above, this study was intended to pave the way to work out the improvement programs as follows: First, it is critical that the financial support from the government should be increased. Second, it is necessary to improve the training of personnel concerned with the handling of domestic violence cases. Third, it is important to make sure that children of abused women should be taken care of safely, and temporary jobs for the women should be secured. This will allow domestic violence shelters to serve their true purpose. Lastly, more adequate counseling services such as more instrumental 1366 phone lines, the development of various programs and the follow-up counseling should be reinforced.

• 한국수자원학회논문집
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• 제43권3호
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• pp.283-294
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• 2010

본 연구의 목적은 저유량에서 발산하는 문제를 해결하여 다양한 흐름과 불규칙한 하도단면을 반영하는 안정적이고 정교한 동적수질해석모형을 개발하는데 있다. 이에 본 연구에서는 기존 모형들의 저유량에서 발산하는 문제를 해결하고자 확산파 운동방정식 기법을 이용하여 수리해석모형인 DyHYD를 개발하였으며, 수질해석모형은 자생 BOD와 수온, DO, TN, TP 등 12가지 수질농도를 계산할 수 있는 DyQUAL을 개발하였다. 개발된 모형의 적용성을 검토하기 위하여 가상하도 및 실제 낙동강유역에서 모의를 수행한 후 실측치와 비교 검토함으로써 모형의 적용성과 신뢰성을 검토하였다. 모형의 수행결과를 관측치와의 비교를 통해 Nash-Sutcliffe 계수를 산정하였으며, 보정과정에서는 유량과 BOD, TN, TP의 Nash-Sutcliffe 계수는 0.391에서 0.591의 범위를 나타내며, 검증과정에서는 0.704에서 0.902의 범위를 나타내었다.

• 한국안전학회지
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• 제26권1호
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• pp.58-64
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• 2011

This study evaluated the effects of the handle width(shoulder width, 1.25${\times}$shoulder width, 1.5${\times}$shoulder width), height(3 levels : knee, medium, knuckle) and horizontal angle($0^{\circ}$, $10^{\circ}$) on the pushing, lifting, and twisting strengths which were required for carrying single or two wheel barrows. Twelve healthy college students(male) participated in the experiment. In each experimental condition($3{\times}3{\times}2$=18), the subjects exerted three forces(pushing, lifting, and twisting clockwise). The experimental conditions and three forces were tested in random order, and a minimum 2 minutes of rest was provided between exertions. Results showed that the mean and maximum pushing forces showed greater values when the horizontal angle was $0^{\circ}$ than $10^{\circ}$(p=0.016). However, the three independent variables had no statistically significant effects on the lifting forces(p>0.1). The mean and maximum twisting forces increased as the handle width became larger(p<0.05). Also, there was a marginal effect of the horizontal angle(p=0.065) on the twisting force. From the results of this study, the horizontal angle of $0^{\circ}$ and the wider handle width were suggested for the design of single-wheel barrows.