• 한국디지털정책학회:학술대회논문집
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• 한국디지털정책학회 2005년도 추계학술대회
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• pp.299-311
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• 2005

This article introduces developing trends of an "Ubiquitous Interface" as an access method for use of various network resources, such as public wireless networks and un-licensed wireless networks in ubiquitous sensor network environments, without troublesome settings or operations by users. "Ubiquitous Interface" is include a relatively wide sense meaning not only physical interface of specified device or between processors, but anything method for access USN. These "Ubiquitous Interface" able to provide seamless services that adapt autonomously to the user's movements and changes in the state of wireless resources. Recently, strongly recommended candidates are RFID, NFC, Multi-mode mobile terminal, Wearable computer and OSGi for integrated digital home networking system as a future ubiquitous interface. These candidates are have to have flexibility and multiple physical communication channel for seamless service hand over and serve easy connection at huge USN to user. And, must have flexible software structure and multi-functional middleware. Consequently, for more enhance performance of an ubiquitous interface and developing, need more structured and integrated future plan.

• Journal of Electrical Engineering and Technology
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• 제11권6호
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• pp.1714-1728
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• 2016

This paper presents improved harmonics extraction based on Adaptive Linear Neuron (ADALINE) algorithm for single phase photovoltaic (PV) shunt active power filter (SAPF). The proposed algorithm, named later as Improved ADALINE, contributes to better performance by removing cosine factor and sum of element that are considered as unnecessary features inside the existing algorithm, known as Modified Widrow-Hoff (W-H) ADALINE. A new updating technique, named as Fundamental Active Current, is introduced to replace the role of the weight factor inside the previous updating technique. For evaluation and comparison purposes, both proposed and existing algorithms have been developed. The PV SAPF with both algorithms was simulated in MATLAB-Simulink respectively, with and without operation or connection of PV. For hardware implementation, laboratory prototype has been developed and the proposed algorithm was programmed in TMS320F28335 DSP board. Steady state operation and three critical dynamic operations, which involve change of nonlinear loads, off-on operation between PV and SAPF, and change of irradiances, were carried out for performance evaluation. From the results and analysis, the Improved ADALINE algorithm shows the best performances with low total harmonic distortion, fast response time and high source power reduction. It performs well in both steady state and dynamic operations as compared to the Modified W-H ADALINE algorithm.

• 산경연구논집
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• 제13권7호
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• pp.17-25
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• 2022

Purpose: Environmental contamination has lately been seen as a consequence of the rise in environmental challenges brought on by rapid industrial expansion. At this point, the current research asks an important question about what the factors are to motivate employees' green performance, increasing corporate sustainability. Research design, data and methodology:The current author selected total 19 items to obtain real data and achieve the purpose of this research. For measuring of the causality between the worker's innovative capability and green performance, the current author used the multiple regression statistical tool using U.S. 215 responses in four industry. Results: The statistical finding definitely indicated that there exists the causal linkage between two key factors (Innovation capability and green performance) as well as the strong direction between two constructs. As a result, the current author could accept all hypotheses, checking no existing the multicollinearity of the present constructs with 'TOL' and 'VIF' values. Conclusions: The present research concluded that literature and business management scholars and practitioners will benefit from this study's statistical results. Furthermore, rewarding staff creativity, encouraging quick answers to market movements, and incorporating technology into everyday operations are all ways that companies may cultivate an environmental stewardship culture.

• 한국항공운항학회지
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• 제15권2호
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• pp.32-39
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• 2007

Air Transportation industry becomes more competitive that the restriction on new access to market were eased and relaxed. Liberalization of international air transport will continue, via bilateral and multilateral process. Korea, Japan, and China have expanded enormously the economic trade and cultural exchange bilaterally in the Northeast Asia, they are acknowledging the importance and necessity of improved connection, it order to face effectively other regional blocks of US-Canada, NAFTA, ASEAN, CLMV. In particular, nobody denies that it is urgent to liberalize bilaterally the air transport in Northeast Asia for promoting reciprocal benefits and prosperity. Recently while open skies bilateral agreements was signed between Korea-China in June, 2006. The agreements processes are too heavily influenced by flag carriers; leading to capacity/market sharing between the bilateral carriers in most markets, against the interest of consumers and overall economic interest of the nation. For successful operation of Northeast Air Market, it is need to set up development strategy paradigm by creating cross-border sub-regional (Northeast Asian) open skies bloc as well as preparing and creating of LCCs operations.

• 조명전기설비학회논문지
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• 제27권11호
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• pp.14-19
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• 2013

Tunnel lighting design and operation are both regulated based on luminance in and out of Korea these days. However, domestic tunnel lighting is operated by internal lighting depending on external brightness by using an illuminometer applying the conversion factor on luminance. The purpose of tunnel lighting is to alleviate the visual shock occurring from the rapid change from external brightness to internal brightness when entering a tunnel. However, when looking at the tunnels operated based on an illuminometer, it is not a system where the driver can measure the brightness within his or her viewing angle when entering the tunnel. It is general to install and operate the illuminometer on the roof of an administrative office near the tunnel; however, this method is not structured to connect with the internal lighting by checking the brightness of the viewing scope of the driver, thus is not structured to properly apply the viewing conditions of the driver. Rather, it should be in a method for extracting the luminance value within the viewing scope of the driver pursuant to tunnel lighting standards and in connection with internal lighting. This research seeks to find the difference between operations based on luminance and operations based on intensity of Illuminance in road tunnels through field measuring, and to suggest the necessity of operating based on luminance with the resulting value.

• 통상정보연구
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• 제11권1호
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• pp.3-25
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• 2009

These days international trade has been converting to e-Trade formation. At this point, Korea has been striving for the trade facilitation; reducing logistics cost and improving foreign competitiveness by computerization operations of the maritime transportation that logistics and customs clearance are involved. However, due to the substantial characteristic of logistics service, the necessity of flexible and various logistics service development using internet has been strongly suggested. In particular, the logistics service which could share documents related to international physical movement between shippers and logistics organization. In this regard, this study carried out interview to explore the problems of physical distribution service and to suggest development direction of e-logistics service. The reason why this survey carried out is that most of users want more effective e-logistic service that could diminish successively real expense decrease. After analysis of survey results, this paper presents the basic development direction and emphasis development subjects. Therefore, the basic direction is presented from four viewpoints; customer-oriented approach, service-oriented approach, total approach and step-by-step implementation. Furthermore six development subjects; web-based standard module development for small and medium forwarders, development of standard logistics ERP system, collaboration model between KTNET and KLNET, system improvement for real users, on-demand system building for SMEs and connection with legacy system have been required.

• 한국초등수학교육학회지
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• 제13권2호
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• pp.285-304
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• 2009

초등학교 수와 연산 영역 중 핵심적인 내용이면서 많은 학생들이 어려워하는 부분이 분수 연산임에도 불구하고 분수의 덧셈과 뺄셈에 관한 연구는 상대적으로 많지 않다. 이에 본 논문은 제7차 및 개정 교육과정에 제시된 내용을 바탕으로 교육과정과 교과서간 연계성, 지도시기의 적절성, 차시 구성의 적절성 측면에서 분수의 덧셈과 뺄셈에 관한 내용을 분석하고 교과서의 내용 전개에 따라 도입, 활동, 익히기 부분으로 나눠서 면밀히 분석하였다. 또한 관련된 내용이 있는 경우마다 익힘책의 내용을 추가적으로 탐색함으로써 분석의 깊이를 고려하였다. 구체적으로 도입 부분에 대해서는 '생활에서 알아보기'에 제시된 문장제가 실생활과 어느 정도 연결되는지, 다루는 문장제의 의미는 무엇이며 그 빈도는 어떠한지, 문장제의 해결 방법을 어떻게 제시하고 있는지를 분석하였다. 활동 부분에 대해서는 공통적으로 많이 활용하고 있는 시각적 모델에 대해서 활용의 다양성과 적절성을 살펴보았고, 활동을 통해 계산 원리 및 방법을 어떻게 형식화하는지를 탐색하였다. 마지막으로, 적용 부분에 대해서는 교과서의 '익히기'와 수학익힘책에 제시된 문제 유형을 분석하고, 문장제를 통해 드러나는 연산의 의미를 집중적으로 분석하였다. 이를 통해 본 논문은 개정 교육과정에 의한 수학과 교과용 도서 개발에 논의거리와 시사점을 제공하고자 한다.

• 한국학교수학회논문집
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• 제11권1호
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• pp.97-115
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• 2008

고등학교 수학 수업에서는 실수 전체의 집합에서 뺄셈은 빼는 수의 덧셈의 역원을 더하고 나눗셈은 나누는 수의 곱셈의 역원을 곱하는 형식적인 관점으로 다룬다. 본 논문에서는 정수의 사칙계산 지도에 있어서 중학교 수학 수업에서 사용되는 직관적 모델(수직선 모델, 셈돌 모델)과 고등학교 수학 수업에서 제시되는 형식적 관점과의 연계에 대하여 논의하고자 한다. 직관적 모델을 이용하여 정수의 뺄셈을 덧셈을 이용하여 나타내는 방법의 의미를 재조명하고 이를 바탕으로 (음수)${\times}$(음수)가 양수임을 지도하는 새로운 방안을 제안하고자 한다. 직관적 모델의 일관성 있는 활용에 바탕을 두고 Treffers(1986)와 Freudenthal(1991)이 제안한 수평적 수학화(horizontal mathematization)의 과정을 통하여 정수의 사칙계산을 지도하는 이 방법은 중학교와 고등학교에서 정수의 사칙계산 수업에 참여하는 교사와 학생들 모두에게 나타날 수 있는 단절(박임숙, 2001)을 제거할 수 있는 방안이 될 것이다. 또 이것은 중 고등학교에서 다루는 수 체계들이 대학과정 대수학에서 다루는 추상적인 수 체계(group, ring, field)와 계통성을 가진 하나의 개념구조를 형성한다는 사실을 학생들이 인지할 수 있는 밑바탕이 될 것이다.

• 경영과학
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• 제17권1호
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• pp.117-134
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• 2000

Pubilc utility industries including the electric utility industry are facing a new stream of privatization com-petition with the private sector and deregulation. The necewssity to solve now and in the future power supply and demand problems has been increasing through the sophisticated generation expansion plan(GEP) approach con-sidering not only KEPCo's supply-side resources but also outside resources such as non-utility generation(NUG) demand-side management (DSM). Under the environmental situation in the current electric utility industry a new approach is needed to acquire multiple resources competitively. This study presents the development of a modified electric generation expansion analysis system(EGEAS) model with avoided cost based on the existing EGEAS model which is a dynamic program to develope an optimal generation expansion plan for the electric utility. We are trying to find optimal GEP in Korea's case using our modified model and observe the difference for the level of reliabilities such as the reserve margin(RM) loss of load probability(LOLP) and expected unserved energy percent(EUEP) between the existing EGEAS model and our model. In addition we are trying to calculate avoided cost for NUG resources which is a criterion to evaluate herem and test possibility of connection calculation of avoided cost with GEP implementation using our modified model. The results of our case study are as follows. First we were able to find that the generation expansion plan and reliability measures were largely influenced by capacity size and loading status of NUG resources, Second we were able to find that avoided cost which are criteria to evaluate NUG resources could be calculated by using our modified EGEAS model with avoided cost. We also note that avoided costs were calculated by our model in connection with generation expansion plans.

• Journal of Chest Surgery
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• 제39권1호
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• pp.12-17
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• 2006

배경: 초 저체온 하 순환 정지는 총 폐정맥 환류 이상을 수술하는데 있어 중요한 보조 수단이다. 그러나 초 저체온 하 순환 정지 하에 심장 수술을 하는 것은 순환 정지 후 신경계 이상의 위험을 동반하고 있다. 이에 완전 순환 정지 없이 총 폐정맥 환류 이상을 수술하여 그 결과를 평가하고자 한다. 대상 및 방법: 2000년 4월에서 2004년 10월까지 10명의 환자의 의무 기록을 후향적으로 분석하였다. 결과: 해부학적 연결 이상의 위치는 심장 상부형이 7예,심장형이 1예, 심장 하부형이 2예였다. 평균 심폐기 가동 시간과 대동맥 차단 시간은 각각 116.8 $\pm$40.7분, 69.5$\pm$24.1분이었다. 수술로 인한 사망 예는 없었고, 합병증은 술 후 폐정맥 협착이 1예, 폐렴, 기흉, 창상 감염, 횡격막 마비가 각각 1예씩 있었다. 평균 16.6개월의 추적 관찰 기간동안 페동맥 협착이 없었던 모든 환아는 NYHA class I으로 지내고 있다. 결론: 총 폐정맥 환류 이상을 완전 순환 정지 없이 수술하여 아주 만족할 만한 결과를 얻을 수 있었다.