• 한국과학교육학회지
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• 제39권1호
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• pp.89-99
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• 2019

이 연구는 중학교 '진화' 단원을 디지털 교재로 개발하여 학생들의 진화 개념 형성과 학습에 대한 흥미에 효과가 있는지 알아보고자 하였다. 오랜 시간에 의한 생물의 변화를 설명하는 생물 진화에 대한 설명은, 많은 내용을 다양하게 제공할 수 있고, 영상을 제작하고 편집할 수 있으며, 어려운 개념을 재미있게 제공할 수 있는 디지털 교과서가 서책형 교과서를 통해 이루어질 때 효과적일 수 있다. 연구를 위해 먼저 5E 순환학습 모형을 기반으로 전자책 저작 도구인 iBooks Author를 활용하여, 4차시로 구성된 진화수업을 만들었다. 개발한 디지털 교재의 효과 검증을 위해 서책형 수업과 디지털 교과서를 활용한 수업을 비교했다. 서책형 교재를 통한 수업과 디지털 교재를 활용한 수업 모두 진화 개념 형성에 유의미한 효과를 보였으나 생명 과학 흥미도와 진화 흥미도는 디지털 교재 수업 집단에서만 유의미하게 증가하였다. 또한 학생을 유형별로 나누어 디지털 교과서 효과를 확인한 결과 디지털 리터러시에 따라 스마트 기기에 친숙한 그룹이 수업에 더 적극적이었고 흥미가 높았다. 개발된 디지털 교재의 만족도 역시 디지털 리터러시가 높은 그룹에서 긍정적인 점수를 나타냈다. 이 연구 결과는 진화 영역 디지털 교재 개발은 어려운 진화 개념을 쉽고 재미있게 접근할 수 있는 수업 도구가 될 수 있음을 알려준다.

• 디지털융복합연구
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• 제10권11호
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• pp.619-626
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• 2012

본 연구의 목적은 일반계고와 특성화고의 스마트 기기 활용 실태와 교육용 애플리케이션 개발에 대한 인식수준을 비교 분석하여 보다 효과적인 조리교육 애플리케이션 개발 방안을 모색하는 것이다. 특성화고 학생이 일반고 학생보다 스마트 기기 활용 학습 방법을 더 선호하고, 하루 사용 시간이 더 많았다. 학습 분야는 일반고는 어학, 특성화고는 자격증에서 높게 나타났다. 스마트 기기 활용 학습의 장점은 자투리시간 활용이었고, 인프라를 가장 필요로 하였다. 가장 기대되는 콘텐츠는 일반고는 동영상 강의, 특성화고는 협력학습이었고, 가장 만족하는 것은 이동성이었다. 조리교육용 애플리케이션 개발에 대해 특성화고 학생이 더 많은 필요성을 느끼고 있었고, 더 많이 활용할 계획을 갖고 있었으며, 실습 동영상을 더 선호하였다. 희망 요리 영역은 일반고는 간편 요리, 특성화고는 조리기능사요리를 선호하였고, 애플리케이션은 포털 사이트와 학과 홈페이지에 탑재되기를 희망하였다. 그러므로, 조리교육용 애플리케이션 개발 시 실습 동영상과 조리 레시피가 포함된 시뮬레이션 학습 위주로 제작하고, 평가 기능을 추가하여 학업 성취 수준을 확인할 수 있도록 한다. 조리기능사 요리가 포함된 5분 이내의 콘텐츠가 될 수 있도록 제작하며, 각 차시별 과제 목표를 제시하고, 문제 해결을 위한 정보를 구체적으로 제공한다. 학습 몰입도를 높이기 위해 영상, 음악, 텍스트가 포함된 콘텐츠를 첨부한다. 수업의 시작과 전개, 정리의 흐름이 있도록 하며, SNS 협력학습 서비스를 활용하여 학습 주체간의 소통이 증진될 수 있도록 한다.

• ETRI Journal
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• 제38권1호
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• pp.112-122
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• 2016

This paper presents a set of candidate regulatory requirements for TV band devices (TVBDs) in the Rep. of Korea. To guarantee the protection of incumbent services, especially digital TV (DTV) and wireless microphones, in TV frequency bands, we suggest minimum separation distances of TVBDs from the noise-limited contour according to incumbent users and TVBD types. This paper also deals with multiple sets of separation distances of a co-channel TVBD network from a DTV protected contour on the basis of the radio propagation characteristics of different geographic areas to make good use of TV white space (TVWS) and safely protect the DTV service. We present a low-power transmission mode of TVBDs and the relevant separation distances for small-cell deployment. The service coverage reduction ratio of a TVBD network is investigated in the presence of DTV interference in four geographic areas. The TVWS field verification results, conducted on the island of Jeju (Rep. of Korea), show that incumbent services operate well without harmful interference from neighboring TVBDs with the proposed separation distances.

• ETRI Journal
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• 제27권4호
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• pp.341-354
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• 2005

The adaptation of video according to the heterogeneous and dynamic resource constraints on networks and devices, as well as on user preferences, is a promising approach for universal access and consumption of video content. For optimal adaptation that satisfies the constraints while maximizing the utility that results from the adapted video, it is necessary to devise a systematic way of selecting an appropriate adaptation operation among multiple feasible choices. This paper presents a general conceptual framework that allows the formulation of various adaptations as constrained optimization problems by modeling the relations among feasible adaptation operations, constraints, and utilities. In particular, we present the feasibility of the framework by applying it to a use case of rate adaptation of MPEG-4 video with an explicit modeling of adaptation employing a combination of frame dropping and discrete cosine transform coefficient dropping, constraint, utility, and their mapping relations. Furthermore, we provide a description tool that describes the adaptation-constraint-utility relations as a functional form referred to as a utility function, which has been accepted as a part of the terminal and network quality of service tool in MPEG-21 Digital Item Adaptation (DIA).

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 추계학술대회 논문집 학회본부
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• pp.462-463
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• 1996

This study describes the dissipation factor measuring techniques of insulating oil on the operating, transformer by using digital signal processing. After applying voltage to the sensor which is installed in a transformer, acquiring source voltage and current of sensor and using cross-correlation techniques, we can check the dissipation factor of insulating oil. To improve measuring accuracy and the speed of process, we use hardware such as TMS320C31 DSP board and analog filter and software such as fast cross-correlation techniques, rectangular window, and digital filtering techniques. We simulated the measuring accuracy and the degree of the noise effect of this new measuring techniques by computer simulation, and compared the simplified measuring devices with Schering Bridge on degraded insulating oil. The result showed that this measuring technique can be used as diagnostic method on the pole transformers.

• 디지털산업정보학회논문지
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• 제15권1호
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• pp.21-28
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• 2019

Internet of Things(IoT) is a technology or environment that collects data by attaching sensors to objects and transmits the collected information to each other through wired / wireless communication in real time. It is expected that when the Internet of objects is activated, many objects can identify and recognize each other by themselves and provide various services to facilitate our lives through mutual information exchange. In addition, the internet market for things is growing rapidly each year, and various IT technologies are expected to converge. In the Internet environment of objects, data exchange technology between object devices, that is, message protocol, is classified as one of important technologies. In this paper, we examine various lightweight message protocols suitable for the Internet environment of objects, and compare the reliability of the CoAP protocol structure with the MQTT protocol for a limited environment. Finally, we confirm the reliability of TCP / TLS and WebSockets-based CoAP transmission protocol of IETF's CoRE WG that can use various transport layers other than UDP in Internet environment including cloud infrastructure.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.853-855
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• 1996

This paper describes the dissipation factor measuring techniques of insulating oil on the operating transformer by using digital signal processing. After applying voltage to the electrodes which is installed In a transformer, acquiring source voltage and current of electrodes and using cross-correlation techniques. we can check the dissipation factor of insulating oil. To Improve measuring accuracy and the speed of process, we use hardware such as TMS320C31 DSP board and analog filter and software such as cross-correlation techniques, rectangular window, and digital filtering techniques. We simulated the measuring accuracy and the degree of the noise effect of this new measuring techniques by using computer simulation, and compared the simplified measuring devices with schering bridge on degraded insulating oil. The result showed that this measuring technique can be used as diagnostic method on the pole transformers.

• 한국멀티미디어학회논문지
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• 제19권8호
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• pp.1564-1573
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• 2016

With the spread of social media and mobile devices, people spend more time on online than ever before. As more people participate in various online activities, much research has been conducted on how to make use of the time effectively and productively. In this paper, we propose two methods which can be used to extract highlights and make searchable media indexes using online social data. For highlight extraction, we collected the comments from the online baseball broadcasting website. We adopted peak-finding algorithm to analyze the frequency of comments uploaded on the comments section of the website. For each indexes, we collected postings from soap opera forums provided by a popular web service called DCInside. We extracted all the instances when a character's name is mentioned in postings users upload after watching TV, which can be used to create indexes when the character appears on screen for the given episode of the soap opera The evaluation results shows the possibility of the crowdsourcing-based media interaction for both highlight extraction and index building.

• 디지털산업정보학회논문지
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• 제14권4호
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• pp.229-239
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• 2018

In this paper, we propose a strategy of charging by analyzing the difference of path coefficient according to whether consumers are free or not, rather than presenting strategies for charging. Mobile devices have become so popular that they are called necessities. Companies have to adapt to the mobile environment and respond to the situation, and have to expand market opportunities strategically. In this study, we extend the technology acceptance model to analyze the incentives of consumers' behavior by analyzing the difference in the effect consumers perceive as a moderating variable, whether paid or free. Efforts to maximize company's inherent profit continue, and in particular, charging is a strategy that all companies should pursue in the mobile environments. It is necessary to grasp the degree of the consumer's response to free and charge. The model of satisfaction with the continuous use and the word-of-mouth intention, which is the behavior intention, is presented by adding parameters of satisfaction to the technology acceptance model. In addition, we try to derive implications by analyzing the influence of moderating effects of whether free or not.

• 한국컴퓨터정보학회논문지
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• 제16권1호
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• pp.11-18
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• 2011

본 연구에서는 RFID 카드 접촉에 의해 시스템 전원을 개폐하는 방식의 디지털 보안 장치를 개발했다. 이는 무선 데이터 송/수신 회로기반으로 설계되었으며, RS-232C전용 칩을 내장하여 컴퓨터나 기타 디지털 기기에도 적용할 수 있다. LED를 장착하여 본 장치의 동작 여부를 점검 할 수 있다. 본 시스템에서 13.56MHz의 주파수 회로가 ID 카드에 전원을 공급하고, 카드 유무를 체크하기 위해 DC 입력단이 카드의 필드 내 근접여부를 확인한다. 본 시스템의 보안 수준은 비교시스템[13]에 비해 보안 수준이 아주 강력하다. 어떤 사용자일경우라도RFID 카드를 이용하지 않으면 시스템을 사용할 수 없다. 인가된 경로 외의 모든 불법적인 접근이 차단된다.