• Asian-Australasian Journal of Animal Sciences
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• 제19권1호
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• pp.91-96
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• 2006

The experiment was conducted to study the effect of choice feeding on growth performance, carcass quality, gastrointestinal development and feed utilization of 22-49 days old broilers. One hundred and forty four 22-day-old broilers were randomly allocated to 3 treatments with 4 replicates per treatment and 12 birds per replicate. Three feeding regimes are complete diet (control), ground corn and protein concentrate (treatment I), and soybean meal and balancer (treatment II). Protein concentrate is the residue part of complete diet without corn, and balancer is the residue part of complete diet without soybean meal. Treatment I and II are designed for the broilers to freely choose the two parts of diet. The results showed that: (1) broilers under choice feeding (treatment I and II) had lower performances compared with the control; (2) gastrointestinal development and the efficiency ratios that broilers converted dietary crude protein and lysine to body weight gain were improved in treatment I (p<0.05); (3) there were no significant differences in the apparent metabolizabilities of dietary dry matter, crude protein and gross energy, and deposition ratios of dietary nitrogen and energy, and carcass quality among three feeding regimes (p>0.05).

• 국제학술발표논문집
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• The 3th International Conference on Construction Engineering and Project Management
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• pp.550-557
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• 2009

The concepts of 'sustainable development', 'sustainable construction' and 'green building' have been elevated to priority levels in all types and phases of construction project development worldwide. Consultants and contractors are now required to seriously consider the impact of their operations on the natural environment and the society, and consequently adopt sustainable construction practices in the development process to minimize and mitigate the negative impacts of their activities. However, existing sustainability rating tools apply to the design, post-construction and operation phases of a building; no tool exists for the rating of the performance of the contractor or the project team at the construction phase. This study aimed to develop a model for evaluating the sustainability of construction operations, drawing on the global best practice standards on sustainability. Practical applications of the model were carried out through case studies to evaluate the performances of fifteen construction firms in New Zealand. The developed model and the outcomes of the case studies were presented, including potential areas of weaknesses, strengths, constraints to achievement or adoption of sustainable construction practices and areas for improvement in the operations of the firms. The successful application of the developed model in practice shows its usefulness and ease of application. It is therefore recommended for adoption as a simple but effective system for measuring and reporting on sustainability performance or sustainability of construction operations of firms in New Zealand and elsewhere.

• 벤처창업연구
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• 제6권4호
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• pp.111-135
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• 2011

사업계획과 경영성과는 높은 상관관계를 보인다는 주장이 이론적인 측면에서는 설득력을 얻고 있지만, 이를 실증적으로 보여주는 국내외의 연구들은 많지 않다. 본 연구는 이러한 점에 착안하여 한국 중소기업을 대상으로 사업계획의 구성요소를 파악하고 각 구성요소들이 경영성과에 미치는 영향이 우량기업과 비우량기업 집단 간에 차이를 보이는지 살펴봄으로써 사업계획과 경영성과의 관계를 실증적으로 규명하고자 하였다. 아울러 이들 영향력이 기업가유형과 기업의 발전단계에 따라 차이를 보이는지도 분석함으로써 연구의 유용성을 제고하고자 하였다. 사업계획의 구성요소들은 재무 및 관련시스템 요인과 제품화 및 판매 요인, 수익 및 품질 요인, 광고 및 유통요인, 경영이념 요인으로, 경영성과는 ROS(return on sales), ROA (return on assets), 시장점유율, 종업원 수의 개선정도로 측정하였다. 연구결과, 사업계획서의 구성요소들은 종업원 수 항목에서 우량기업집단과 비우량기업집단을 통계적으로 유의하게 구분하고 있었으며, 특히 분류집단 예측력이 높은 요인은 재무 및 관련시스 템 요인과 광고 및 유통 요인이었다. 하지만 ROS, ROA 및 시장점유율에서는 통계적으로 유의하 지 않았다. 경영성과에 미치는 영향력 측면에서 기술/장인 기업가는 제품화 및 판매 요인, 수익 및 품질 요인을, 일반/기회 기업가는 재무 및 관련시스템 요인, 광고 및 유통요인, 경영이념 요인의 영향력을 높게 평가하였으며, 모든 발전단계에서 경영이념 요인의 영향력이 가장 높았다. 여러 요인 가운데서도 특히 재무 및 관련시스템 요인과 광고 및 유통 요인은 기업가유형 간 및 발전단계 간에 통계적으로 유의한 차이를 보이고 있어 사업계획 수립 시 중점을 두어야 함을 시사하고 있다.

• 농촌지도와개발
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• 제20권1호
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• pp.105-141
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• 2013

본 연구에서는 마을단위 농업경영체 경영성과에 미치는 영향요인에 대해 설명하였다. 본 연구의 목적은 마을단위 농업경영체의 경영개선방안 기초 연구로서 마을단위 농업경영체의 개념정리 농업경영체의 구축과 지속적 운영을 위해 경영성과요소를 조사분석 하였다. 본 연구의 대상은 마을단위 농업경영체로 행정구역상의 마을단위로 한정짓기보다는 마을이라는 개념을 넓게 보기위한 상징적인 개념으로 영농활동을 적극적으로 수행하는 농업인이 면 군 단위로 또는 수평적으로 활동하는 확장된 범위에서의 농업경영체를 의미한다. 이를 토대로 실제 마을을 움직이고 있는 핵심농이 벤치마킹할 수 있으며 현재 운영하고 있는 예비사회적 기업, 농어촌공동체회사, 색깔있는 마을 중에서 표본을 추출하고 140개소에 현장방문 및 우편, 전화설문조사를 실시하였다. 이중 설문에 참여한 경영체 51개소로, 조사결과를 바탕으로 인적인프라, 문화유산관리, 공동체유대감, 공동체커뮤니케이션, 의사결정과정 및 갈등관리역량보다는 경영역량, 생산역량, 마케팅역량, 경쟁역량이 경영성과(매출액)와 관계가 있는 것으로 나타났다. 이를 참고하여 마을 단위 농업경영체들의 성과에 영향을 주는 요소들을 실증적으로 살펴봄으로써 향후 실무적인 차원에서 농업경영체를 운영하는 주체들에게 시사점을 줄 것으로 기대한다.

• Advances in aircraft and spacecraft science
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• 제1권3호
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• pp.353-378
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• 2014

This paper deals with the early development of the Anuloid, an innovative disk-shaped VTOL aircraft. The Anuloid concept is based on the following three main features: the use of a ducted fan powered by a turboshaft for the lift production to take-off and fly; the Coanda effect that is developed through the circular internal duct and the bottom portion of the aircraft to provide further lift and control capabilities; the adoption of a system of ducted fixed and swiveling radial and circumferential vanes for the anti-torque mechanism and the flight control. The early studies have been focused on the CFD analysis of the Coanda effect and of the control vanes; the flyability analysis of the aircraft in terms of static performances and static and dynamic stability; the preliminary structural design of the aircraft. The results show that the Coanda effect is stable in most of the flight phases, vertical flight has satisfactory flyability qualities, whereas horizontal flight shows dynamic instability, requiring the development of an automatic control system.

• 시스템엔지니어링학술지
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• 제15권2호
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• pp.47-56
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• 2019

Although the weapon systems are becoming more diverse and complex, they are progressing in a short development period and a longer test and evaluation period. The more difficult the given environment is, the more efforts and performance of quantitative target values can be made by development agencies to carry out stable projects. However, these target values of the Integrated Logistics Support are not specified in the requirements and being set during the system development phase. In this paper, application of MOEs, MOPs and TPMs for ILS are presented and provided the basis for carrying out systematic Verification & Validation activities. As a result that MOEs of the ILS were chosen as Availability and MOPs as Mission Reliability, Logistics Reliability, Maintainability and Supportability and TPMs as MTBF, MTBCF, MTTR and so on. In particular, it is appropriate tailoring and apply the TPMs considering the cost, schedule, scope of work and characteristics of the project.

• 한국안전학회지
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• 제32권1호
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• pp.60-65
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• 2017

In this study, a simplified FE model for evaluating seismic performance of valve support was suggested and an apparatus for a real structure testing was developed. The seismic performances of three different types of valve supports were evaluated by the real structure testing. By comparing the results between the real structure testing and FEA using the simplified FE model, it was verified that the suggested simplified FE model can be utilized for comparative evaluation of seismic performance of valve supports.

• 시스템엔지니어링학술지
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• 제10권2호
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• pp.71-79
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• 2014

To enhance success probability of a system development project, its overall risk level should be minimized through systematically managing schedules, costs, and technical performances. However, Attempts to manage technical performance compared to numerous efforts to control costs and schedules in such projects are deficient. Particularly, a space launch vehicle, a large complex system, development project is much less likely to meet its technical performance objectives due to its technological difficulty, along with schedule delay and cost overrun. The technical performance management (TPM) is a method for tracking and managing technical progress in order to achieve technical performance targets within schedule and budget. In this paper, we investigate applications of the TPM in several space launch vehicle development projects. Then we propose and validate the TPM process to achieve a successful mission in such projects.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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• pp.797-799
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• 2006

The Electro-optical camera subsystem as a payload of a satellite system consists of OM (optical module) and CEU(camera electronics unit), and most performances of the camera subsystem depend a lot on the CEU in which TDI CCDs(Time Delayed Integration Charge Coupled Device) take the main role of imaging by converting the light intensity into measurable voltage signal. Therefore it is required to specify and design the CEU very carefully at the early stage of development with overall specifications, design considerations, calibration definition, test methods for key performance parameters. This paper describes the overview of CEU development. It lists key requirement characteristics of CEU hardware and design considerations. It also describes what kinds of calibration are required for the CEU and defines the test and evaluation conditions in verifying requirement specifications of the CEU, which are used during acceptance test, considering the fact that CEU performance results change a lot depending on test and evaluation conditions such as operational line rate, TDI level, and light intensity level, so on.

• Journal of the Optical Society of Korea
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• 제16권1호
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• pp.63-69
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• 2012

This paper presents a method to derive the theoretical requirements for the development of a 400 mm optical window that transmits dual-band wavelengths and had a stable structure. We also present design and fabrication results. Among the required specifications, the surface figure error was defined by the transmitted wavefront deformation (TWD), ${\lambda}$/15 rms at 632.8 nm. This value was derived by estimating the predicted performances with respect to five independent items that could cause system performance degradation and then calculating the required wavefront error (WFE) to satisfy the performance goals. We measured the image resolution at each performance level to trace and verify the requirements. The article also describes a design optimization process that could minimize the weight and volume of the optical window attached to the payload securing the FOV of the camera. In addition, we accurately measured the deformation that occurred in the series of fabrication steps including processing, coating, assembly, bonding and bolting, and investigated the effects by comparing them to the results of a simulation performed in advance to derive the predicted performance.