• 정보과학회 컴퓨팅의 실제 논문지
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• 제23권9호
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• pp.535-541
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• 2017

소프트웨어 시장 규모가 확대되면서 다양한 요구사항을 만족시키는 대규모 소프트웨어가 개발되고 있다. 이로 인해 소프트웨어 복잡도가 증가하게 되고 품질 관리는 어려워졌다. 특히, 레거시 시스템의 개선 및 새로운 시스템 개발 환경에서 재사용은 중요하다. 이 논문에서는 품질을 인증 받은 모듈을 재사용하는 방법을 제안한다. 재사용 적용 레벨은 코드 영역(메소드, 클래스, 컴포넌트), 프로젝트 도메인, 비즈니스로 나누어진다. 이 논문에서는 소프트웨어 복잡성을 측정하는 결합도와 응집도 기반의 재사용 메트릭과 메소드와 클래스 레벨에 따라 "재사용에 적합한 모듈 덩어리"를 시각화하는 재사용 적합 모듈 추출 메카니즘을 제안한다. 레거시 프로젝트에 역공학 기법을 적용하여 어떤 모듈/객체/덩어리가 재사용할 수 있는 지를 식별하고 확장 시스템을 개발하거나 유사한 새로운 시스템을 개발하기 위해 재사용한다면 소프트웨어의 신뢰성을 보장하고 소프트웨어 개발 단계에서 필요한 시간과 비용을 절감시킬 수 있다.

• Journal of Communications and Networks
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• 제16권3호
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• pp.293-300
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• 2014

As energy harvesting communication systems emerge, there is a need for transmission schemes that dynamically adapt to the energy harvesting process. In this paper, after exhibiting a finite-horizon online throughput-maximizing scheduling problem formulation and the structure of its optimal solution within a dynamic programming formulation, a low complexity online scheduling policy is proposed. The policy exploits the existence of thresholds for choosing rate and power levels as a function of stored energy, harvest state and time until the end of the horizon. The policy, which is based on computing an expected threshold, performs close to optimal on a wide range of example energy harvest patterns. Moreover, it achieves higher throughput values for a given delay, than throughput-optimal online policies developed based on infinite-horizon formulations in recent literature. The solution is extended to include ergodic time-varying (fading) channels, and a corresponding low complexity policy is proposed and evaluated for this case as well.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제22권2호
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• pp.123-134
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• 2019

In this paper, we articulate what is a lesson for all learners with different cognitive levels and what kind of teaching practices are required to implement this type of lesson. For all learners' own sense-making, open-ended tasks are the primary sources to bring their various mathematical ideas. These tasks can be meaningfully implemented by appropriate teaching practices: providing enough time (for thinking deeply and for preparing a reply), acting intentionally (alternative wrapping up activities and appointment of a struggling student), and cultivating collaborative classroom norms (respecting peer's thinking and learning from peers). This exploratory study has the potential to help practitioners and researchers understand the complexity of the work of teaching and clarify how to deal with such complexity.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2000년도 제15차 학술회의논문집
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• pp.175-175
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• 2000

In this Paper we propose a navigation algorithm which can be used to estimate state vectors such as position and velocity for its motion control using multi-sensor output measurements. The output measurement we will use in estimating the state is a series of known multi-sensor asynchronous outputs with measurement noise. This paper investigates the Extended Kalman Filtering method to merge asynchronous heading, heading rate, velocity of DVL, and SSBL information to produce a single state vector. Different complexity of Kalman Filter, with biases and measurement noise, are investigated with theoretically data from KRISO's AUV. All levels of complexity of the Kalman Filters are shown to be much more close and smooth to real trajectories then the basic underwater acoustic navigation system comment)'used aboard underwater vehicle.

• 인간행동과 음악연구
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• 제12권1호
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• pp.23-42
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• 2015

본 연구는 아동 및 청소년을 대상으로 연령과 음악 경험에 따라 화음 전개 복잡성에 대한 선호도가 어떻게 달라지는지 그 특성을 알아보고자 하였다. 이를 위해 초, 중, 고등학교에 재학 중인 총 684명의 아동 및 청소년을 대상으로 실험이 실시되었다. 본 연구를 위해 4마디의 멜로디가 연구자에 의해 작곡되었고, 협화적 화음과 비화성음의 비중, 화음 해결의 즉각성 등을 바탕으로 화음 전개의 난이도가 4단계로 구성되었다. 대상자들은 4개의 음악 자극을 듣고 지각되는 복잡성과 화음 선호도의 정도를 표시하였다. 대상자들의 평가를 분석한 결과, 청소년의 연령에 따른 단계별 화음 선호도에 유의한 차이가 있었다. 선호 점수에 있어서 초등학생은 모든 단계의 화음에 높은 선호를 보인 반면, 중, 고등학생은 화음 복잡성이 증가할수록 유의하게 낮은 선호도를 보였다. 연령 외에도 악기 연주 훈련 기간 역시 화음 선호도에 유의한 영향을 미치는 것으로 나타났다. 악기 연주 훈련을 보다 오래 받은 그룹이 짧게 받은 그룹보다 화음 복잡성 변화를 보다 민감하게 지각하여 개인이 수용할 수 있는 복잡성 수준이 보다 높은 것으로 나타났으며, 이는 연령이 많을 수록 더욱 분명하게 나타나는 경향이 있었다. 이러한 연구 결과는 아동 및 청소년을 위한 감상음악 선곡 시 적절한 난이도의 화음을 선택할 수 있는 기초자료로써 의의를 갖는다.

• 복식
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• 제56권9호
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• pp.1-13
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• 2006

The purpose of this study is to apply a concept of open structure to clothing design and to verify the characteristics found in the various types of clothing which has open structure. The literatures from various academic fields including philosophy, literature, social science, architecture, and fine arts are investigated to define the concept of openness and to analyze it from the perspectives both of the visual and of the moaning of openness. This paper is to identify the types and the characteristics of clothing by future intention, complexity, discontinuity of open structure. By closely examining fashion design after 1980s found in fashion collection publications and designer's websites, the results of this study are as follows: first, the concept of openness can be classified into two different levels, that is, visual and meaning, secondly, in clothing the concept of open structure is applied to the meaning side by future intention, by complexity and by discontinuity. Open structure through future Intention has new content and interpretation and must have the possibility of intelligence awakening, future guidance and basic contents. Open structure through complexity has secondary function exists concurrent with the shape key example is the smart clothes with the digital functions. It has functions of amusement, supplement and protective, and is future clothes which satisfies with health, welfare, desire of beauty. Open structure with discontinuity is clothes with dramatic changes in system, structures and states. Structure can be changed by silhouette, detail, or fabric, material, or dramatic and practical function as tools in terms of productions and environment. This study can help to formulate and to integrate the concept of open structure in clothing with various phases and enhance the value of clothes by showing an application of the concept of openness to the clothing in meaning level.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1998년도 제13차 학술회의논문집
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• pp.157-160
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• 1998

We argue that the combination of optimal control synthesis and QFT tuning enables design of controllers with levels of performance that surpasses what can be achieved using only a single technique. Using a constructive example, we demonstrate how the strength of each technique is utilized to arrive at a particularly desired controller in terms of tradeoffs between performance and controller complexity.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2216-2219
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• 2003

Accurate speech region detection and automatic syllable segmentation is important part of speech recognition system. In automatic speech recognition system, they are needed for the purpose of accurate recognition and less computational complexity, In this paper, we Propose improved syllable segmentation method using ramp edge detection method and residual signal Peak energy. These methods were used to ensure accuracy and robustness for endpoint detection and syllable segmentation system. They have almost invariant response to various background noise levels. As experimental results, we obtained the rate of 90.7％ accuracy in syllable segmentation in a condition of accurate endpoint detection environments.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.965-966
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• 2006

As billion transistors system-on-chip (SoC) design becomes a reality, the productivity gap between rapidly increasing design complexity and designer productivity lagging behind is becoming a more serious problem to be solved. To reduce the gap, we present a system that generates executable transaction level models automatically. It speed up the SoC design space exploration process at various abstraction levels.

• 한국군사과학기술학회지
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• 제19권3호
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• pp.404-414
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• 2016

Autonomy of unmanned systems is important because the unmanned system with high level of autonomy is able to perform desired tasks in unstructured environments without continuous human guidance. Evaluation of their autonomy is vital to realize the autonomous operation ability of unmanned system. Compared to the methods of evaluating the level of autonomy(LOA) for an unmanned ground vehicle(UGV) and unmanned aerial vehicle(UAV), the method of expressing the LOA of unmanned maritime system(UMS) is not established yet. Since UMS has a unique characteristics in terms of operational area, mission complexity and required technologies, compared to the UGV and UAV, it is required to establish for expressing the LOA for UMS. This paper reviews the current approaches to assess the LOA of unmanned system and proposes potential metrics for UMS in order to determine the autonomy levels of UMS.