• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.686-689
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• 2002

본 논문에서는 EJB환경에서의 강의시스템 구현에 관한 논문이다. 이 시스템은 하나는 교수강의시스템을 구현하고, 다른 하나는 수강생 개개의 공동 작업형 환경을 구현함을 목적으로 하고있다. 이 시스템은 기존의 N-tier방식의 클라이언트/서버 방식에서 벗어나 분산 환경에서 작업이 가능하도록 함이 목적이다. 본 논문은 분산환경에서 가장 유용한 언어중 하나인 J2EE를 기반으로 구성하였으며 따라서 이 기종간의 컴퓨터 환경에서도 확장 및 포팅이 용이하고 장차 생길지도 모르는 새로운 요구 사항에서도 대처 할 수 있게끔 함이 주목적이라 할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10d
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• pp.49-51
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• 2002

소프트웨어 산업의 급속한 발전과 더불어 소프트웨어의 생산성의 향상과 재사용 측면이 매우 강조되면서 다양한 방법으로 접근이 되고 있다. 특히 J2EE의 EJB 기반의 컴포넌트 개발은 플랫폼에 독립적으로 운용이 가능한 시스템개발에 큰 영향을 미쳤다. 그리고 디자인 패턴의 개념을 도입함으로써 다시 발생될 수 있는 문제점들을 패턴으로 정리하고 해결점까지 제시하고 있어 소프트웨어의 재사용 측면에 발전을 가져오고 있다. 본 논문에서는 여러 디자인 패턴 중 Dual Persistent Entity Bean 디자인 패턴을 이용하여 엔티티 빈을 설계하는데 BMP와 CMP를 동시에 지원할 수 있는 환경을 이용한 모델을 제시하고 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2003.04d
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• pp.43-45
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• 2003

EJB(Enterprise JavaBeans)는 Sun사에서 추진하는 분산 트랜잭션 기반의 엔터프라이즈 어플리케이션을 위한 컴포넌트 컴퓨팅 아키텍처이다. 또한 J2EE 표준 플랫폼에서 서버 측 컴포넌트를 위한 아키텍처로써, 다중플랫폼 또는 다중 서버에 이식 가능한 비즈니스 로직을 표현하는 코어 기술이다. 본 논문에서는 이러한 EJB 아키텍처에 따라 구현된 EJB 서버 시스템을 클러스터링 환경으로 확장하여 고가용성 및 확장성을 얻고자 할 때 고려해야 할 사항들과 시스템 구현에 따른 구체적인 설계 방안을 제시한다.

• Asian-Australasian Journal of Animal Sciences
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• v.16 no.8
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• pp.1143-1150
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• 2003

This study was conducted to investigate in vitro methane production of feed ingredients and relationship between the content of crude nutrients and methane production. Feed ingredients (total 26) were grouped as grains (5 ingredients), brans and hulls (8), oil seed meals (9) roughages (3), and animal by-product (1) from their nutrient composition and their methane production protential were measured by in vitro gas test. Among the groups, the in vitro methane productions for both 6 and 24 h incubation were highest in grains, followed by brans and hulls, oil meals and roughages, animal byproducts. Within the group of grains, methane production from wheat flour was the highest, followed by wheat, corn, tapioca, and then oat. Within the brans and hulls, soybean hull showed the highest methane production and cotton seed hull, the lowest. Methane production from oil meals was lower compared with grains and brans and hulls, and in decreasing order production from canola meal was followed by soybean meal, coconut meal, and corn germ meal (p<0.01). Three ingredients were selected and the interactions among feed ingredients were evaluated for methane production. Correlation coefficient between measured and estimated values of the combinations were 0.91. Methane production from each feed ingredient was decreased with increasing amount of crude fiber (CF), protein (CP) and ether extract (EE), whereas positive relationship was noted with the concentrations of N-free extract (NFE). The multiple regression equation (n=134) for methane production and nutrient concentrations was as follows. Methane production (ml/0.2 g DM)=(0.032${\times}$CP)-(0.057${\times}$EE)-(0.012${\times}$CF)+(0.124${\times}$NFE) (p<0.01; $R^2$=0.929). Positive relationship was noted for CP and NFE and negative relationship for CF and EE. It seems possible to predict methane production potential from nutritional composition of the ingredients for their effective application on formulating less methane emitting rations.

• Asian-Australasian Journal of Animal Sciences
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• v.13 no.5
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• pp.605-612
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• 2000

Four young swamp buffalo cows of similar age ranging in weight between 280 to 380 kg and trained to do physical work were used in a study to determine energy and protein requirements for draught using a $4{\times}4$ Latin square designed experiment. The experiment consisted of field trials employing 4 levels of work load, e.g. no work as control, and loads amounting 450 to 500 Newton (N) pulled continuously for 1, 2 and 3 h daily for 14 consecutive days. Cows were fed king grass (Penisetum purpuroides) ad libitum and were subjected to materials balance trials. Body composition was estimated in vivo by the body density method and daily energy expenditure (EE) was calculated from ME minus retained energy (RE). The results show that EE while not working ($EE_{resting}$) was $0.42kgW^{0.75}MJ/d$ and maintenance ME ($ME_m$) was $0.37kgW^{0.75}MJ/d$. ME requirement increased to 1.65 times maintenance for the work of 3 hours. The energy expended for doing exercise ($E_{exercise}$) was 9.56, 20.0 and 25.86 MJ/cow for treatments 1, 2 and 3 II, respectively. Fat retention was absent in all groups of working cows, but protein retention was only negative for cows undertaking 3 h work. The relationship between $E_{exercise}$ (MJ), work load (F, kN), work duration (t, h) and body mass (W, kg) was found to be: $E_{exercise}=(0.003F^{1.43}t^{0.93})/W^{0.09}MJ$. The maintenance requirement for digestible protein was $2.51kgW^{0.75}g/d$, whereas digestible protein for growth ($DP_{growth}$) and for work ($DP_{work}$) followed the equations: $DP_{growth}=[(258+1.25W^{0.75}){\Delta}Wkg/d]g$ and $DP_{work}=[12.59e^{0.95t}]g$, respectively The coefficients a, b and c for the calculation of $E_{exercise}$ components according to the Lawrence equation were found to be 2.56 J/kgW.m, 5.2 J/kg load carried.m and 0.29, respectively, thus efficiencies to convert ME into work were 0, 16.09, 27.3 and 32.44% for control, 1, 2 and 3 h/d work, respectively. ME and DP requirements for a 250 to 400 kg working buffalo cow allowing to growth up to 0.5 kg/d are presented.

• Herbal Formula Science
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• v.29 no.2
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• pp.93-103
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• 2021

Objectives : This study was conducted to evaluate the Intraocular pressure (IOP) and retina neuroprotective effect of Acer palmatum thumb. extract in glaucoma of DBA2/J mice vivo model. Methods : The amount of change in intraocular pressure(IOP) was measured every two weeks for 30 weeks in the DBA2/J glaucoma animal model. The increased IOP were regrouping into drug treatment groups. EW and EE (1, 2 mg/㎖)extract was eye drop administered twice per day for 8 weeks. After administration of the extract, IOP was measured every 1 week at a fixed time for 8 weeks, and protein expression levels and serological changes related to retinal function were investigated. Results : The DBA2/J mice were IOP increased as time dependent, resulting in damage to the retinal function protein related in glaucoma animal model. However, administration of extracts from Leaves of Acer palmatum thumb. prevented an increase IOP, increased for Brn3α, PKCα, and OPN1SW. Additionally, the experssion of Aterocyte maker, GFAP was decreased in DBA2/J mice. Conclusions : These results demonstrate that both IOP and age can be considered in studies using DBA2/J mice and suggest that the extracts from Leaves of Acer palmatum thumb. regulating of IOP and expression of proteins related to retinal function.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.7
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• pp.1567-1574
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• 2012

Since a migration method of the mobile agent is a factor that affects the overall performance of the entire distributed system, it is necessary to find efficient migration methods of the mobile agent within the sensor network and to collect and store data related to various components(server, sink and sensor node) of the sensor network, thereby providing consistent naming services. Accordingly, this paper presents design and implementation of MetaTable that is divided into MetaData where information on the sensor data server is stored and SubMetaData where various types of information on sink nodes and data on sensor nodes connected with the sink nodes is stored. Moreover, the paper also presented the implementation of forward migration of an active rule mobile agent applying the naming method based on RMI that used the meta_table and proposed the possibility of constructing efficient sensor network application environment. In this paper, for registration, release and retrieval methods suitable for new sensor network environment, we designed and implemented the naming agent by applying J2EE model based on RMI-IIOP(Internet Inter-ORB Protocol) technique.

• Journal of the Korea Society of Computer and Information
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• v.13 no.7
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• pp.127-138
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• 2008

Configuration and data management system for weapon system research and development processes should assist concurrent engineering and collaboration activities for various documents, drawings, part informations and product structure informations. In this thesis we defined the system architecture using the CBD methodology and implemented the component based system development process. Most of the configuration and data management systems consist of three layered system architecture which use the general MVC models. In this thesis we defined four layered system architecture based on EJB structure under J2EE environments. Through the four layered system architecture, we break down the general model layer into two detailed business layers and the ordinary control layer into two system dependent layers. With these four layers, we proposed the methodology that detailed the characteristics of the components. Through the CBD approach and the component based development process, we can get the representation model and implement the actual system of the configuration and data management system for weapon system R&D.

• Journal of KIISE:Software and Applications
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• v.33 no.6
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• pp.525-538
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• 2006

Component-Based Software Engineering (CBSE) is widely accepted as new paradigms for building applications with reusable assets. Mismatch problems occur while integrating the assets and make a burden in CBSE. Therefore, a larger-grained reuse unit than a component such as a framework is required, and it consists of relevant components, connectors and domain-specific architecture. The benefits of frameworks over components are commonly known, however, the key elements and internal structure of framework has not been clearly defined. We believe most of the framework models proposed in recent works remain at conceptual level. In this paper, we propose a practical-level framework reference model, and define key elements of frameworks. The research goal is to precisely identify concrete elements of a framework, inter-connection of components within a framework, extended notion of connectors, and tailored meaning of architecture In a framework. Hence, the proposed framework can be practically implemented in common object-oriented languages and with middleware such as lava, J2EE, CORBA Component Model (CCM) and NET.

• Asian-Australasian Journal of Animal Sciences
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• v.21 no.9
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• pp.1252-1261
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• 2008

Twenty-four yearling Boer$\times$Spanish goats were used in a crossover design experiment to determine effects of tethering on forage selection, intake and digestibility, grazing behavior and energy expenditure (EE) with forage high in nutritive value and low to moderate in mass. Objectives were to determine if tethered goats could be used as a model for study of unrestrained animals and to characterize tethering as a production practice. Four 0.72-ha pastures of wheat (Triticum aestivum) and berseem clover (Trifolium alexandrium) were grazed in December and January. Each pasture hosted six animals, three with free movement and three attached to a 4.11-m tether for access to a circular area of $53.1m^2$. Tethering areas were moved each day. One animal of each treatment and pasture was used to determine forage selection, fecal output or grazing behavior and EE; therefore, there were eight observations per treatment. Mass of forage DM before grazing in Tethered areas averaged 1,280 and 1,130 kg/ha in periods 1 and 2, respectively. The CP concentration in ingesta was greater ((p<0.05) 239 and 209 g/kg; SE = 8.0) and the NDF level was lower (p<0.05) for Free vs. Tethered animals (503 and 538 g/kg; SE = 12.0); in vitro true DM digestion was similar between treatments (0.808 and 0.807 for Free and Tethered, respectively; SE = 0.0096). Intakes of DM (1,013 and 968 g/d; SE = 78.6), NDF (511 and 521 g/d; SE = 39.9) and ME (10.9 and 10.7 MJ/d; SE = 0.90) were similar between treatments, but CP intake was greater (p<0.05) for Free vs. Tethered animals (241 and 203 g/d; SE = 17.2). There were small treatment differences in in vivo apparent digestibility of OM ((p<0.05) 0.780 and 0.814; SE = 0.0049), CP ((p<0.05) 0.800 and 0.817; SE = 0.0067) and NDF ((p<0.09) 0.777 and 0.760 for Free and Tethered, respectively; SE = 0.0078). There were no treatment effects on time spent ruminating or grazing (346 and 347 min/d for Free and Tethered, respectively; SE = 42.5), but EE was considerably greater (p<0.05) for Free vs. Tethered animals (571 and 489 kJ/kg $BW^{0.75}$; SE = 8.9). In conclusion, with forage of high nutritive value and low to moderate in mass, tethering can offer a production advantage over free grazing of less energy used for activity despite similar grazing time. With forage removal considerably less than that available for grazing, effects of tethering on chemical composition of selected forage were small and less than needed to markedly affect digestion. Tethering may offer a means of studying some aspects of grazing by ruminants, but would not seem suitable for energy metabolism.