• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.537-543
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• 1999

While there are to estimating design discharge , we are in trouble with how to separate area, Because discharges will be different depending on the shape of area even though there are same size of area . This study is for a reasonable presentation of design discharge method where there are changing characteristcs of area with SCS and Clark theory by sung HEC-1 Model. While we were Estimating desgin discharge with separating area in a relation to Time of Concentration(Tc) with SCS , Clark method, we found that if there are no variation of Tc the value of a discharge is not changed where shapes of area are different though. And from the result of analysis with SCS and Clark method, we ascertained that discharge by the SCS method was more bigger than that of the Clark where Area is less than 100ha. On the other hand, Clark method is more bigger in the more 1000ha.

• 한국게임학회 논문지
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• 제4권3호
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• pp.77-84
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• 2004

게임의 게임성, 재미의 제공, 볼거리 및 배경그래픽 제공하고, 게임플레이의 활동 무대인 배경-맵과 배경그래픽 디자인을 구현하기 위해서는 게임 배경환경은 매우 중요한 요소이다. 본 연구에서는 게임 배경환경의 구성요소를 정의하고, 시대적 및 역사적인 환경요소, 자연적인 환경요소, 인공적인 환경요소, 문화적인 환경요소, 가상적인 환경요소를 문헌과 사료를 통하여 고찰 연구하였으며, 실제 게임 배경맵에 적용할 수 있는 배경그래픽의 환경디자인 모델을 제시한다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2005년도 춘계학술대회 논문집
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• pp.387-392
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• 2005

Double-deck train have studied in the next generation train in KRRI. Double-deck train have more seat capacities compared with single deck vehicles and is a efficient, reliable and comfortable alternative train. Because of heavy weight, weight minimization of double-deck train carbody is imperative to reduce cost and extend life-time of train. Weight minimization problem of the double-deck train car-body is required to decide 66 design variables of thicknesses for large aluminum extruded panel while satisfying stress constraints. Design variables are too many and one execution of structural analysis of double-deck train carbody is time-consuming. Therefore, we adopt approximation technique to save computational cost of optimization process. Metamodels such as response surface model (RSM) and kriging model are used to approximate model-based optimization is described. RSM is easy to obtain and expressed explicit function, but this is not suitable for highly nonlinear and large scaled problems. Kriging model employs an interpolation scheme and is developed in the fields of spatial statistics and geostatistics. Target of this design is to find optimum thickness of AEP to minimize weight of doulbe-deck train carbody. In this study, meta model techniques are introduced to carry out weight minimization of a double-deck train car-body.

• 한국농공학회:학술대회논문집
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• 한국농공학회 1999년도 Proceedings of the 1999 Annual Conference The Korean Society of Agricutural Engineers
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• pp.93-98
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• 1999

This study is performed to select irrigation design year from 10-year return period 7-month(April to October) precipitation amount and compare reference crop evapotranspiration at 13 regions by REF-ET model. 1. Seven-month growing season average reference crop evapotranspiration values showed low values of 4.1 ∼4.2mm /day by FAO-24 Corrected Penman method, and 3.6 ∼3.7mm/day by FAP-24 Blaney Criddle method in Chinjin and Ulsan, high values of 4.9mm/day by FAO-24 Corrected Penman method , 4.1mm/day by FAO -24 Blaney Criddle method in Mokpo and Pohang. 2. Estimated seven-month growing season average reference crop evapotranspirations are 4.6mm/day by FAO-24 Corrected Penman method, 3.9,mm/day by FAO-24 Balney Criddle method, 4.0mm/day 1985 Hargreaves method, respectively.

• 한국정보통신설비학회:학술대회논문집
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• 한국정보통신설비학회 2008년도 정보통신설비 학술대회
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• pp.233-236
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• 2008

There are several kinds of service standards for 3G($3^{rd}$-Generation) wireless communication as WCDMA, CDMA2000 and WiBro(Wireless Broadband Internet). Especially WiBro Wave2 system is a marked currnt issue. In this paper, we describe on the cell plan tool to desgin WiBro Wave2 network. For this, we treat from basic theory to practical substance to produce new(or modified) path loss prediction model for 2.3GHz. And we explain the method how to implement new technology MIMO(Multiple Input Multiple Output) deployed in Wave2 system. Also we emphasize on the importance of LOS(Line Of Sight) analysis in WiBro network design.

• 산경연구논집
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• 제10권10호
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• pp.45-51
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• 2019

Purpose - The purpose of this study was to propose a win-win development plan for not only suppliers of delivery applications but also traditional market vendor companies and delivery riders by analyzing existing delivery models and presenting a new delivery model to enhance competitiveness of the traditional market using delivery apps. Research desgin, data, and methodology - Specifically, small retailers, such as traditional markets and supermarkets, presented a compromised delivery model that utilizes the platform of specialized delivery app service providers for order reception, and that the delivery is delivered by delivery systems jointly hired by Vendor companies, such as franchising companies. To validate the significance of the trade-off delivery model, a cost-benefit analysis was conducted by those involved in the delivery application. Results - From the perspective of suppliers of specialized delivery applications, it is analyzed that the use of specialized delivery applications in traditional markets will be a new market opportunity for service providers to achieve increased sales. It is expected that consumer choice and satisfaction will be increased as convenience and accessibility of traditional market businesses that were available only through direct visit from the user side of the delivery application will be expanded. From the standpoint of delivery application franchises, it is analyzed that they can seek to increase sales and increase customer service as well as ease labor cost burden due to joint employment of delivery riders. The delivery rider will be able to seek to improve customer service due to job security, wage stability, risk reduction and overheated competition due to direct employment. Conclusion - In conclusion, the compromised delivery model solved the problems raised in the preceding study conducted on delivery application suppliers, users, franchises, and riders to establish that it could be a strategic alternative to increasing sales and expanding detailed rights for the self-employed in the traditional market, which are experiencing difficulties in management. However, the adoption of a compromise delivery model requires social consensus from those involved in the delivery application and requires legal, institutional and policy support, which will require continued follow-up research on the delivery model in the future.

• 한국산학기술학회논문지
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• 제12권12호
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• pp.5849-5855
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• 2011

애플리케이션 소프트웨어 개발 환경이 빠르게 변함에 따라 사용자 인터페이스 설계의 중요성이 증가하고 있다. 일반적으로 대부분의 설계자들은 설계 인터페이스에서 상호 의존성 있는 객체들을 정의하기 위해 개인 각자의 주관적인 방법으로 그룹화한다. 그러나 특정한 규칙이 배제된 체 설계된 인터페이스는 이러한 시스템을 사용하는 사용자들에게 업무의 비효율성과 복잡성만 증가시킬 뿐이다. 그러므로, 본 논문에서는 인터페이스 프로토타입을 정형화 함으로써 어떠한 GUI 환경에서도 유연한 개발을 할 수 있도록 객체지향 설계 모델을 제안한다. 사용자 인터페이스의 가시적 응집도는 사용자 인터페이스 내용들과 연관된 연구를 해왔던 새로운 범주영역이며, 기본적 소프트웨어 공학 개념을 사용하는 것을 정의한 것으로서 인터페이스의 응집 원리에 기반한다. 가시적 응집도는 프로그래밍 단위로 나타나는 비즈니스 이벤트의 응집도 뿐 아니라 각 단위 객체가 정렬되고 그룹화되는 방법에 대한 결과를 내포한다. 따라서 인터페이스는 비즈니스 이벤트들이 상호 연관성으로 그룹화 된다면 이해하기 쉽고 사용하기가 더욱 용이해질 것이다.

• 대한토목학회논문집
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• 제33권5호
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• pp.1741-1751
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• 2013

본 연구에서는 프리텐션 공법으로 제작된 프리스트레스 콘크리트 거더의 정적거동을 조사하는 것이 주요 목적이다. 이동식 제작대를 이용하여 현장에서 제작된 지간 30m의 프리텐션 거더에 대한 재하시험이 수행되었다. 모든 시험결과는 수치해석결과와 비교되었으며, 거더의 중앙부에 대한 변위와 변형률이 측정되었다. 실험결과에서 실물모형 시험체의 초기균열발생 하중은 사용하중 보다 1.75배 증가된 하중에서 발생하였다. 또한 연성설계기준을 만족하여 시험체는 초기균열 발생후에 취성파괴하지 않고 연성 파괴될 것으로 판단되었다. 사용성 검토에서 균열발생시의 처짐값이 도로교설계기준(2010)에서 제시한 활하중 재하시의 허용처짐량을 만족하였다. 유한요소 해석결과와 시험결과는 전체적인 거동이 매우 유사하게 나타났으며, 현장제작 프리텐션 거더의 사용성과 안전성 측면에서는 큰 문제가 없는 것으로 판단된다.