• Journal of Korean Society for Geospatial Information Science
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• 제16권2호
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• pp.67-76
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• 2008

Recently, one of the most outstanding technological characteristics of aerial survey is an application of Direct Georeferencing, which is based on the integration of main sensing sensors such as aerial camera or Lidar with positioning sensors GPS and IMU. In addition, a variety of digital aerial mapping cameras is developed and supplied with the verification of their technical superiority and applicability. In accordance with this requirement, the development of a multi-looking aerial photographing system is just making 3-D information acquisition and texture mapping possible for the dead areas arising from building side and high terrain variation where the use of traditional phptogrammetry is not valid. However, the development of a multi-looking camera integrating different sensors and multi-camera array causes some problems to conduct time synchronization among sensors and their geometric and radiometric calibration. The establishment of a test field for aerial sensor calibration is absolutely necessary to solve this problem. Therefore, this paper describes investigations for photogrammetric Test Field of foreign countries and suggest an establishment scheme for domestic test field.

• Journal of Digital Contents Society
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• 제16권3호
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• pp.457-462
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• 2015

Hybrid video call healthcare system that we propose in thesis is a service for powerless people rather than ordinary people. This system is for communication between users and protectors(or volunteers). To reduce the underprivileged through the 'Malbeot Nanumi' is the purpose of the system. Hybrid Health Care System using a video call and temperature/humidity/pulse sensors that we propose in thesis can connect sensors with software, and save p2p connection information for 'Malbeot Nanumi' service by database. And health check data can save locally. Hybrid Health Care System in a Wireless Network Environment is a system that elderly people living alone is to be a conversation. The purpose of this thesis is to develop the software and to design a convenient UI to the user, And increasing consumption of care system by increasing the happiness index and increasing aging population.

• Solar Energy
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• 제15권3호
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• pp.127-140
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• 1995

This experimental study was carried out to examine the heat transfer characteristics of a 2-dimensional impinging air jet on a flat plate with a set of square rods. The objectives of the study were to investigate the flow and heat transfer characteristics caused by the square rods. Experiment was carried out first without using the rods to establish the baseline heat transfer performance. Then, rods of different widths and clearances were installed to cause the turbulence on the fluid flow. When rods are installed in front of the plate, the acceleration of the flow and the turbulence generation due to the rods and reattachment of the flow seem to contribute to the observed heat transfer augmentation and the heat transfer augmentation increases as the clearance decreases. With wider individual rod the heat transfer coefficient is higher, which is due to the increased acceleration and development of the eddies just before the rods.

• Communications of Mathematical Education
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• 제34권3호
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• pp.201-214
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• 2020

In December 2019, new coronavirus (COVID-19) which was started from Wuhan caused a dramatic changes in college mathematics education around the world from the spring semester 2020. All classes in college was switched to online classes at once. As a result, many efforts were made to keep the quality of mathematics education in college. We have discussed the situation that we did experience and discussed a possible changes that future mathematics education and research can face in the post-corona era (after coronavirus, AC era). Finally, we discussed an evaluation method for student activities that can be used in online class evaluation.

• Journal of the Korean Institute of Gas
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• 제21권6호
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• pp.15-22
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• 2017

The pressure safety valve is very important device for securing the safety in the facilities which is operated by high pressure gases. The performance test should be periodically inspected by relate law because the failure of pressure safety valves might be main causes of serious accidents in the industrial fields. Shop test is mainly use for inspecting the performance test of pressure safety valves but the test method is not to be a solution for securing the safety. So, the development of alternative method is required. In this paper, there is a limit to securing the safety if the performance test is with just shop test. The limitation is checked from analysis result based on performance test results of pressure safety valves. The necessity for introducing the in-service test is reviewed to surmount the limitation. As a result, in-service test method should be developed and introduced to improve the inspection efficiency and economical loss. Also, it can be reduce the risk level.

• The Transactions of the Korea Information Processing Society
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• 제4권2호
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• pp.349-362
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• 1997

In order to make a meaningful multi-media object,it is usually necessary to apply a number of non-trival operations.If multi-media data can be encapsulated in a standaridized form and stored in a database,it is poss-ible to share and reuse multi-media data among users without repeating the same or similar operations. Based on the OLE component object model,this paper proposes the integrated computing enviroment for naive user to share and reuse of Ole objects.Various types of multi- media objects that are created by their appropriate OLE application programs can be aggreagated to form a multi-media document.In addition,the OLE objects can also be stored in database by a controlled manner.TheOLE object in a database can be retrieved by a visual query interface and reused to make a new document.This paper describes the common Platform to integrate various ment of OLE appfication programs,the separation process of an OLE object form a document,and the overall management of OLE object in a database.

• Journal of the Korea Academia-Industrial cooperation Society
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• 제14권1호
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• pp.116-127
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• 2013

Korea, like most of other countries, is enforcing the national pension as social insurance which is a kind of the income policy. Despite the fundamental limitation on public pension or the imperfect policy, the guarantee of the minimum living standard for maintaining dignity of human being is not being reached for the standard. Poverty rate of the elderly in Korea is the first among the OECD countries and public pension dead zone is very large. The elderly low income class could become a serious social problem if low fertility and aging keep getting worse. In this study, I will analyze the present condition of the retirement security for the elderly in South Korea. Also, I will look into the present situation of old-age income security and determine problems, and propose the improvement devices for related laws.

• The KIPS Transactions:PartB
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• 제13B권5호
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• pp.525-532
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• 2006

This paper proposes a new class of image restoration on the Ising modeled binary 'Takbon' image by the flexible line-fitting ICM(Iterated conditional modes) method. Basically 'Takbon' image need be divided into two extreme regions, information and background one due to its stroke combinations. The main idea is the line process, comparing with the conventional ICM approaches which were based on partially rectangular structured point process. For calculating geometrical mechanism, we have defined line-fitting functions at each current pixel array which form the set of linear lines with gradients and lengths. By applying the Bayes' decision to this set, the region of the current pixel is decided as one of the binary levels. In this case, their statistical reiteration for distinct tracking between intra and extra region offers a criterion to decide the attachment at each step. Finally simulations using the binary 'Takbon' image are provided to demonstrate the effectiveness of our new algorithm

• Proceedings of the Korea Water Resources Association Conference
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• 한국수자원학회 2015년도 학술발표회
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• pp.581-581
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• 2015

기후변화의 영향으로 자연재해 현상이 더욱 심각해지고 있다. 기상청에 의하면 서울특별시의 2005~2014년의 강수량은 1970년대에 비해 여름철에 38.7% 증가한 반면, 나머지 계절은 8.7%감소하여 홍수와 가뭄의 빈도가 상승하는 역설적 현상이 나타나고 있다. 또한 수도권 지역의 경우 도시화로 인한 불투수 면적 증가로 하천변의 홍수 피해지역이 더욱 증가되고 있는 실정이다. 재해 발생 규모는 점차 대형화되고 유형 또한 다양화되어 재해 발생 시 단순히 단일 지역이 아닌 여러지역에 걸쳐 피해가 발생되고 있다. 때문에 협력과 연계를 통한 치수대책이 효과적이지만, 현재 재해관련 업무는 여러 부처에 분산되어 있으며 지자체간 협력이 미흡한 실정이다. 이러한 한계를 극복하기 위해 본 연구에서는 재해 발생 시 피해를 최소화하기 위해 지자체들의 개별화 되어있는 대책을 서로 연계하는 방재협력시스템과 방재 대책 협력 방안을 제시하고자 한다. 국내 외 방재정책의 패러다임을 진단하기 위하여 관련 법령과 자료 및 도시의 협력대응사례를 조사, 분석하여 새로운 패러다임을 수립하고 이를 기초로, 기후변화를 고려하여 새로운 방재시스템을 제시하고 재난관리 협력방안을 모색하였다. 본 연구를 통하여 제안하고자 하는 새로운 방재시스템은 복구와 구조물적 대응 위주인 기존의 방재 패러다임에서 예방에 의한 방재와 탄력적 대응을 도입하도록 하여 예방적 차원의 이슈를 논의하고 비구조물/구조물 융합형 방재 개념을 실제 시스템으로 사용하도록 구체적 방안을 제안하였다. 또한 기존의 국내 도시방재형 패러다임을 분석한 결과, 인접지역의 계획간 연계가 부족하여 정책적 사각이 발생하고, 재해취약지역이 적절히 관리되지 못할 위험성이 존재하며 환경이나 지속 가능성에 취약한 형태가 될 수 있다. 따라서 수도권 내 지방자치 단체 간 협력을 통하여 사용할탄력적 개념을 제시하였으며, 이 개념의 적용을 통하여 효율적 재해 대응이 이루어 질 수 있다. 본 연구의 정책 제안을 기반으로 수도권 내 서울시 인천시 경기도 지역이 상호 협력하여 탄력적인 방재시스템을 구축하기 위한 기초자료로 활용될 수 있을 것으로 사료된다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• 제18권6호
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• pp.243-250
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• 2018

This paper designs and implements a smart care system for the senior citizen who lives alone. Recently, as the level of living has increased due to the rapid improvement of medicine, living standard and environment, the proportion of the elderly population is increasing. In addition, the proportion of the elderly living alone, which is increasing with the aging society, suggests that the provision of services such as the elder care system and emergency notification is becoming an important issue. However, since the existing emergency notification technology analyzes fixed CCTV images, it is difficult to monitor in the blind spot of CCTV and to move to a place where the camera is not installed. There is a problem that it can not be performed. Therefore, in this paper, we design and develop a smart care system that utilizes robot and object tracking technology that can move in real time to overcome these shortcomings. This enables real-time monitoring regardless of the location, and prompts for assistance in case of an emergency, so that it can provide convenience to cares and assistants.