• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.30 no.10A
• /
• pp.886-895
• /
• 2005

As the networked media technology have been grown in recent, there have been many research works to deliver high-quality video such as HDV and HDTV over the Internet. To realize high-quality media service over the Internet, however, the network adaptive streaming scheme is required to adopt to the dynamic fluctuation of underlying networks. In this paper, we design and implement the network-adaptive HD(high definition) MPEG-2 streaming system employing the frame-based prioritized packetization. Delivered video is inputted from the JVC HDV camera to the streaming sewer in real-time. It has a bit-rate of 19.2 Mbps and is multiplexed to the MPEG-2 TS (MPEG-2 MP@HL). For the monitoring of network status, the packet loss rate and the average jitter are measured by using parsing of RTP packet header in the streaming client and they are sent to the streaming server periodically The network adaptation manager in the streaming server estimates the current network status from feedback packets and adaptively adjusts the sending rate by frame dropping. For this, we propose the real-time parsing and the frame-based prioritized packetization of the TS packet. The proposed system is implemented in software and evaluated over the LAN testbed. The experimental results show that the proposed system can enhance the end-to-end QoS of HD video streaming over the best-effort network.

• 대한공업교육학회지
• /
• v.38 no.2
• /
• pp.68-88
• /
• 2013

This study is to analyze teacher's recognition and needs of STEAM education in specialized high schools for technical fields. For this study, survey using questionnaire was applied to teachers in specialized high schools for technical fields. This study includes the recognition and the needs on STEAM education of general and industrial subject teachers in specialized high schools for technical fields. In order to carry on this study, 655 questionnaires were collected from teachers of 16 specialized high schools for technical fields in the whole country. Practically, 611 questionnaires (257 of normal subject teachers and 398 of industrial subject teachers) were used for this study. As a result, it is known that the needs of STEAM education is larger to industrial subject teachers than general subject teachers. But it is disclosed that STEAM education is more difficult to general subject teachers than industrial subject teachers. In requirements of teaching-learning, general subject teachers only required reference materials, but industrial subject teachers needed STEAM lesson under the same subjects and data sharing system as a priority. General and industrial subject teachers also considered education program development for creative thinking skills and problem solving abilities as a priority. Finally, in the administrative and financial requirement, both of them demand to reduce administrative tasks as a priority.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.27 no.2
• /
• pp.130-136
• /
• 1982

Experiments were conducted to establish a measuring method of the stomatal aperture in the leaves of the wheat plant, and to find the diurnal movements of the stomate in leaves of different position and tillers. The measurement methods used were the infiltration and the microrelief impression methods. The aperture of the stomate in the infiltration method was expressed in terms of the solutions pent ration into the leaf and this was refered to as the infiltration score. A score I represents injection with 10% iso-butyl alcohol＋90% ethylene glycol solution and a score 7 represents injection with 70% iso-butyl alcohol +30% ethlene glycol solution. A linear relationship was obtained between the infiltration score and average pore width in a large number. of the stomata observed in the leaves of the adaxial and abaxial epidermis. The aperature of the stomate of flag and the 1st leaf were exhibited diurnal change with the maximum aperture at 10 A.M. but that of 2nd leaf reached maximum aperture 2 hours later than upper two leaves. After reaching the maximum aperture the stomata gradually closed and then completely closed at 6 P.M. The aperture of the stomate in the adaxial epidermis and the base part of the leaf were larger than those in the abaxial and top part of the leaf, and aperture of the stomate in the leaves of the main stem was larger than those on the tillers.

• Journal of the Korean Regional Science Association
• /
• v.39 no.3
• /
• pp.3-12
• /
• 2023

The issue to be discussed is set as the relationship between urban fragmentation and urban heat phenomena. The fragmentation is recognized as a negative form that commonly occurs in the process of urbanization. The purpose of this study is to examine the relationship between urbanization entropy and heat phenomenon by looking at the five major cities in Korea. The employed methods are InVEST Urban Cooling Model and MSPA (Morphological Spatial Pattern Analysis) by using the meteological data for the July 2018. The major results are as follows; First, a low rank correlation(rho=-0.3) is found in the relation between entropy and Cooling Capacity Index (CCi). Second, a very high level of rank correlation is observed between entropy and Average Temperature(℃)(rho=0.9). The implications are that 1) a city with a large degree of sprawling development can have a negative effect on urban heat phenomena; 2) the composition of land use including dispersion and concentration in non-urbanized areas, which has the characteristics of open space, can affect the urban thermal environment. Due to the limited number of case studies, it is appropriate to understand that a possibility, not generalization, is observed between entropy and heat phenomena in urbanized areas.

• Informatization Policy
• /
• v.30 no.4
• /
• pp.40-61
• /
• 2023

The adoption of smart factories and smart manufacturing as strategies to enhance competitiveness and stimulate growth in the manufacturing sector is vital for a country's future competitiveness and industrial transformation. The government has consistently pursued smart manufacturing innovation policies starting with the Manufacturing Innovation 3.0 strategy in the Ministry of Industry. This study aims to identify policy areas for smart factories and smart manufacturing based on technical standards. Analyzing policy areas at the current stage where the establishment and support of domestic standards aligning with international technical standards are required is crucial. By prioritizing smart manufacturing process areas within the industry, policymakers can make well-informed decisions to advance smart manufacturing without blindly following international standardization in already well-established areas. To achieve this, the study utilizes a hierarchical analysis method including expert interviews and importance-performance analysis for the five major process areas. The findings underscore the importance of proactive participation in standardization for emerging technologies, such as data and security, instead of solely focusing on areas with extensive international standardization. Additionally, policymakers need to consider carbon emissions, energy costs, and global environmental challenges to address international trends in export and digital trade effectively.

• Journal of Internet Computing and Services
• /
• v.25 no.3
• /
• pp.71-81
• /
• 2024

In response to the COVID-19 pandemic, the global airport industry is actively introducing 4th Industrial Revolution technology-based systems for quarantine and passenger safety, and test bed construction and prior verification using airport infrastructure and resources are actively being conducted. Analysis of recent cases shows that despite the changing travel patterns of airport users and the diversification of airport service demands, most testbeds construction studies are still focused on suppliers, and task prioritization is also determined by decision makers. There is a tendency to rely on subjective judgment. In order to find practical ways to become a first mover that leads innovation in the aviation industry, this study selected tasks and derived priorities to build testbeds from a service perspective that reflects various customer service needs and changes. Research results using the AHP analysis method resulted in priorities in the order of access transportation and parking services (29.2%), security screening services (23.4%), and departure services (21.8%), and these analysis results were tested in the airport industry. It shows that innovation in testbeds construction is an important factor. In particular, the establishment of smart parking and UAM transportation testbeds not only helps strengthen airports as centers of technological innovation, but also promotes cooperation with companies, research institutes, and governments, and provides an environment for testing and developing new technologies and services. It can be a foundation for what can be done. The results and implications produced through this study can serve as useful guidelines for domestic and foreign airport practitioners to build testbeds and establish strategies.

• Communications for Statistical Applications and Methods
• /
• v.19 no.1
• /
• pp.77-84
• /
• 2012

Mack and Skillings (1980) proposed a typical nonparametric method in a randomized block design with replications. However, this method may lose information because of the use of average observations instead of individual observations. In this paper, we proposed a nonparametric method that employed an aligned method suggested by Hodges and Lehmann (1962) under a randomized block design with replications. In addition, the comparative results of a Monte Carlo power study are presented.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 1996.07a
• /
• pp.89-102
• /
• 1996

본 연구는 우리나라 대기오염의 실태를 알아보고, 급격히 증가하고 있는 대기오염으로 인한 사회적 비용을 산출해 봄으로서 비용-편익분석에 기초하여 이루어지고 있는 선진국형 환경규제기준의 발판을 마련하는데 그 의의가 있다. 이러한 연구는 앞으로 WTO의 정식의제로 채택되리라고 예상되는 환경정책에 능동적으로 대응하고, 우리나라 환경정책의 우선순위의 결정 및 사람들이 체감으로 느끼는 대기오염의 심각성을 확인시킴으로써 환경보전에 대한 인식을 확산, 환경정책의 수행을 용이하게 한다. 이산화질소와 호흡기 질환의 반응도에 관한 실증분석의 결과는 이산화질소가 인체의 호흡기 질환에 매우 유의적인 영향을 미치고, 이산화질소 대기오염으로 인한 한해 동안의 사회적 비용은 약 5조 3,946억원을 상회했다. 이외에 상관관계를 이용해 대기오염이 질병에 미치는 영향을 진료과목별로 분류하여 분석한 결과는 대기오염이 질병에 상당한 상관관계를 갖고 질병을 유발시키고 있음을 확인했다.

• Proceedings of the Korea Contents Association Conference
• /
• 2012.05a
• /
• pp.169.2-169.2
• /
• 2012

암 관련 유전자를 후성유전학적으로 제어하는 방법에는 miRNA, DNA 메틸화, 그리고 히스톤 단백질의 변형에 의해서 가능하다. 그러나 후성유전학적 방법을 통해서 암 관련 유전자를 제어하기 위해서는 첫째, 한 유전자에 여러 miRNA들에 의해서 조절되기 때문에 선택의 문제가 있으며, 둘째, 암 관련 유전자를 제어하는 DNA 메틸화 패턴이 다양하며, 셋째, 히스톤 단백질의 변형 자체가 다양하며 각 유전자에 대한 히스톤 변형의 특이성이 있다. 따라서 후성유전학 기반 하에서 암 관련 유전자를 제어하기 위해서는 시스템 수준에서의 접근이 바람직하다. 본 연구에서는 암 관련 유전자의 네트워크를 구축하고, 이 네트워크를 기반으로 암 유전자를 제어하는 miRNA에 최우선 순위를 부여하는 방법, 암 유전자의 DNA 메틸화 모티프 패턴을 분석하는 방법, 히스톤 변형과 암 관련유전자의 상관관계를 분석하는 방법을 제시하고자 한다.

• Proceedings of the Korean Information Science Society Conference
• /
• 2012.06c
• /
• pp.248-250
• /
• 2012

사이버 공격이 다양해지면서 침입 탐지 시스템이 탐지 못하는 공격들이 늘어가고 그에 따라서 침입 감내 시스템의 필요성이 대두되고 있다. 기존의 가상화 기반 침입 감내 시스템들은 같은 가상 이미지를 정화해서 사용하므로 항상 같은 취약점을 가지고 있게 된다. 이 논문에서는 기존의 가상화 기반 침입 감내 시스템의 보안상 문제점을 지적하고 해결하기 위한 아이디어를 제시한다. 그리고 각 가상 이미지에 부여된 점수를 기반으로 노출 우선 순위를 배정하는 정책을 제안한다.