• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.106-106
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• 2018

Ecosystem service valuation is a crucial step for the sustainable management of watershed. In the context of various ecosystem services provided by watershed, this study, particularly deals with water yield computation in Bagmati Basin of Nepal. The water availability per population in Bagmati Basin is lowest compared to other basins in Nepal. Also, the rate of urbanization is rapidly growing over a decade. In this regard, the objectives of this study are 1) to compute the total water yield of the basin along with computation on a sub-watershed scale, and 2) Study the impacts of land use change on water yield based on CLUE-S model. For the study, Integrated Valuation of Environmental Services and Tradeoffs (InVEST), a popular model for ecosystem service assessment based on Budyko hydrological method is used to compute water yield. As well, CLUE-S model is used to study land use change, which is further related to study variation on water yield. The sub-watershed wise outcome of the study is expected to provide the guidelines for the effective and economic management of a watershed on a regional scale.

• Proceedings of the Korea Water Resources Association Conference
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• 2018.05a
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• pp.213-213
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• 2018

최근 기후변화로 인한 강우 패턴이 변화하고 있으며 강도가 큰 강우의 발생빈도가 높아짐에 따라 홍수의 위험성이 증가하고 있다. 또한, 강우발생의 공간적 이질성이 더욱 증가하는 실정이며, 지역적 강우특성은 각 유역의 지형적 특성과 맞물려 홍수특성을 나타낸다. 이러한 상황은 보다 상세한 지역적 특성을 반영하여 홍수를 대처하는 방어 체계가 요구되며, 행정구역간 강우의 특성을 분석하여 할 필요가 있다. 이와 관련하여 본 연구에서는 낙동강권역에 강우의 지역적 특성을 파악하기 위해, 행정구역별 강우에 대한 빈도분석을 실시하였다. 이를 위하여 과거 기상청의 홍수 예 경보 기준을 분석하였으며, 낙동강권역에 해당되는 70개 행정구역(시,군,구)에 해당되는 기상청 및 국토교통부의 강우관측소의 데이터를 사용하였다. 본 연구 결과는 같은 빈도에서 행정구역별로 강우의 크기가 상당히 달랐으며 특정시기에 발효된 호우특보와 해당 행정구역에 100년 빈도의 강우크기에 차이가 있는 것으로 나타났다. 행정구역별 홍수위험전망 매트릭스를 구축하는데 있어 행정구역별 홍수 위험의 크기를 결정하는데 본 연구 결과가 적용될 수 있다고 판단된다. 또한, 국가 홍수 재해 연구를 진행할 때 유역단위 및 행정구역별 홍수 방어방안을 활용함으로써 관련 연구들의 연구방안에 기본 자료로 활용될 수 있을 것으로 사료된다.

• Annual Conference of KIPS
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• 2010.11a
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• pp.1701-1704
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• 2010

기존 안드로이드 응용프로그램에 대한 자원 접근 제어는 응용프로그램을 작성한 개발자가 XML 파일에 미리 선언한 권한을 검사하는 방식으로 이루어진다. 이 권한은 인스톨되는 시점에 사용자의 동의를 얻어 해당 응용프로그램에 수여되며 응용프로그램이 특정 권한을 의도적으로 사용자로부터 은닉하는 것을 방지할 수 있다. 하지만 사용자는 해당 응용프로그램에 허용하고자 하는 일부 권한만을 수여할 선택권이 없다. 선언된 모든 권한을 허락하거나 그렇지 않으면 아예 응용프로그램을 설치할 수 없게 된다. 또한, 응용프로그램에 부여한 권한을 변경할 수는 없고 박탈하는 방법은 응용프로그램을 삭제하는 방법밖에 없었다. 따라서 본 논문에서 제안하는 기법은 응용프로그램의 자원 접근을 사용자가 fine-grained 하게 제어할 수 있도록 하는 기법이다. 이를 위해 응용프로그램을 사용하는 시점에도 각 접근 권한을 '항상 허용', '항상 사용자가 확인' 그리고 '항상 거부'로 세부적으로 설정 및 변경이 가능하도록 하였다. 또한, MS Windows Vista 에서 적용하고 있는 '사용자계정컨트롤'(User Account Control)과 같이 응용프로그램이 요구하는 권한 중 '항상 사용자가 확인'으로 설정 된 권한은 요청 시점에 사용자에게 팝업을 띄워 접근 제어에 대한 가시성을 확보하여 사용자가 확인할 수 있도록 하였고 사용자가 이를 수락한 경우에만 해당 권한을 수여 받을 수 있도록 하였다.

• Journal of the Korean Society of Propulsion Engineers
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• v.8 no.3
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• pp.17-26
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• 2004

In this paper, power transmission systems converts the shaft power of a Turbo-shaft Engine with Free Power Turbine into the generator power and be composed of a method being supplied in the thrust motor driving a propellers. Being used this, Gas turbine engine works to flat rating about 110 kw (147 shp) that the thrust motor be extremely supplied from the engine of 317shp. In this test equipment, the engine is installed with the flywheel being able to the damping function when happen to the varying load between gas turbine engine output-shaft and generator. Then if the flywheel of inertial moment be not considered, the generator and motor not get the required power from the engine for raising the load. Also it is certified that the engine works the abnormal operation. Hence the flywheel of inertial moment is determined the required range to do the performance analysis with the dynamic transient from the given and tested engine data. This system is able to get the required power after a mounting test with the redesigned flywheel.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.2
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• pp.142-149
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• 2004

This paper presents a neural network controller of a grid-connected wind energy conversion system for extracting maximum power from wind and a power controller to transfer the maximum power extracted into a utility grid. It discusses the modeling and simulation of the wind energy conversion system with the controllers, which consists of an induction generator, a transformer, a link of a rectifier, and an inverter. The paper describes tile drive train model, induction generator model and grid-interface model for dynamics analysis. Maximum power extraction is achieved by controlling the pitch angle of the rotor blades by a neural network controller. Pitch control method is mechanically complicated, but the control performance is better than that of the stall regulation. The simulation results performed on MATLAB show the variation of the generator torque, the generator rotor speed, the pitch angle, and real/reactive power injected into the grid, etc. Based on the simulation results, the effectiveness of the proposed controllers is verified.

• 한국HCI학회:학술대회논문집
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• 2008.02b
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• pp.268-273
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• 2008

This work defines user intention according to intention range, and also proposes an interactive sound installation which reflects and varies above features. User intention consists of several decomposition concepts, which are elemental intentions, partial intentions, and a universal intention. And also, each concept is defined as inclusion/affiliation relationship with other concepts. For the representation of elemental intention, we implemented an musical interface, Color note, which represents the colors and notes according to response of participants. We also propose Harmonic Defragmentation (HD), which arranges the partial intentions with harmonic rule. Finally, the universal intention is inferred to the comprehensive direction of elemental intentions. We used Karhunen-Lo$\`{e}$ve(K-L) Transform for the inference. For verifying the validity of our proposed interface, the "Color Note," and the various techniques, we installed our work and surveyed various users for the evaluation of HD and statistical techniques. Also, we commissioned another survey to find out satisfaction measurement which was used for expressing universal intention.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.37 no.12
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• pp.79-90
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• 2000

In this paper, a high-performance floating point unit, which is suitable for high-performance superscalar microprocessors and supports IEEE 754 standard, is designed. Floating-point arithmetic unit (AU) supports all denormalized number processing through hardware, while eliminating the additional delay time due to the denormalized number processing by proposing the proposed gradual underflow prediction (GUP) scheme. Contrary to the existing fixed-radix implementations, floating-point divide/square root unit adopts a new architecture which determines variable length quotient bits per cycle. The new architecture is superior to the SRT implementations in terms of performance and design complexity. Moreover, sophisticated exception prediction scheme enables precise exception to be implemented with ease on various superscalar microprocessors, and removes the stall cycles in division. Designed floating-point AU and divide/square root unit are integrated with and instruction decoder, register file, memory model and multiplier to form a floating-point unit, and its function and performance is verified.

• Journal of the Korea Society for Simulation
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• v.21 no.1
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• pp.69-79
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• 2012

One of the goals of mass customization is to permit changes in the product to meet specific customer requirements without substantially impacting the cost or delivery schedule. In large assembly manufacturing industries, such as shipbuilding and commercial airplane production, customization takes place by changing components and/or modules, sometimes called interim products. Using shipbuilding as a case study, it is possible to study the impact of such changes using mass customization principles on the schedule. In large assembly manufacturing, mass customization changes would cause changes in engineering time and production time, based on the amount of change required by the customization. This work first proposes a structure for implementing mass customization in shipbuilding and then uses simulation of a simplified, theoretical shipbuilding process to evaluate the impacts of various levels of change on delivery performance.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.16 no.5
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• pp.947-952
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• 2012

The technology suggested in this study is the method to contain executable software in a portable storage devices like the USB and install an application program to operate it in any client devices. To solve this problem, we can store pre-scanned information on the above client's files, registry, and services in the device before installing the proper application program to be installed using the scanning method and manage in the USB the resources that generated and changed by post-scanning the information after installing the above application program in the client's device. After that, necessary files in the client to be used can be copied for using, and after use, related files are deleted, and it also includes the process to return to the previous system environment. This method is advantageous in that once any sort of application programs needed to be installed gets to be installed in an external portable storage devices like the USB, the application program installed can be operated in any computer not raising any issues like illegal copy.

• Annual Conference of KIPS
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• 2001.04a
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• pp.561-564
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• 2001

본 논문은 무선 에플리케이션 프로토콜 Specification에서 제시하고 있는 WTA(Wireless Telephony Application) 를 기초로 네트워크에서 발생한 실시간 Event를 처리할 수 있는 모바일 클라이언트 및 WTA서버에 대한 설계와 구현에 대해서 기술한다. 또한 네트워크 이벤트 및 사용자가 발생시킨 이벤트를 디바이스에 독립적으로 처리할 수 있는 WTA 라이브러리와 필요한 컨텐츠를 실시간으로 브라우징하기 위한 Repository 에 대해 기술한다. 전체적인 WTA 환경 구조는 크게 2개의 물리적 구조인 Mobile Client와 WTA Server로 구현되어있다. Mobile Client의 내부 모듈은 표준 WAE 사용자 에이전트(Standard WAE User Agent)의 확장인 WTA 사용자 에이전트 모듈(WTA User-Agent Module), 필요한 resource를 서버로 요청하고 저장하는 채널 인스톨 모듈(Channel Install Module), network로부터 발생한 Event를 처리하는 이벤트 핸들러 모듈(Event Handler Module), mobile network 기능들(e.g. setting up calls)과 device specific feature(e.g. manipulating the phonebook)를 다루는 WTA 스크립트 라이브러리(WTA Script Library), Phonebook 엑세스 모듈(Phonebook Access Module), 실시간으로 즉각 이벤트에 반응하기 위한 Repository로 구성되어있고, WTA Server는 Client가 요청한 Content(services)를 전달 해 주는 컨텐트 전달 모듈(Content Deliver Module)과 서버 Phonebook 엑세스 모들(Server Phonebook Access Module)로 구성되어 있다.