• 융합신호처리학회논문지
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• 제20권4호
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• pp.186-192
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• 2019

일반적으로 운항 중인 선박이나 건조 중인 선박의 선저에는 많은 해양 생물들이 부착된다. 이러한 현상으로 인해 선박 표면의 거칠기가 증가하여 선박속도의 손실이 발생하게 되고 결과적으로 경제적 손실 및 환경오염 등의 발생을 초래하게 된다. 본 연구에서는 선박 선저에 부착된 해양생물 및 선저 상태를 검사하는 수중드론 등의 카메라 영상을 획득/활용한다. 획득된 해당 영상은 관리자 육안확인에 의해 해양 생물들에 따른 거칠기 등을 판단하게 된다. 이에 영상을 보정하는 필터 알고리즘을 원본 영상에 적용함으로써 해양 생물들 부착 여부 등에 대한 올바른 판단에 도움을 줄 수 있다. 수중 영상의 보정 알고리즘에는 다양한 필터가 필요하며, 어두운 수중 환경에 맞는 조명이 판단에 많은 영향을 미치므로 조명의 밝기 정도에 따른 해양 생물 부착 여부 판단에 대한 내용도 소개하고자 한다. 본 연구에서 적용된 보정 알고리즘 및 각 알고리즘별 조명 밝기에 따른 연구테스트 결과는 많은 분야에 적용 가능할 것으로 사료된다.

• 수도
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• 제24권5호통권86호
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• pp.29-44
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• 1997

Sewage sludge produced in Korea was 1,275,800 tons (dewatered sludge cake) per year in 1996, which is 3,495 tons per day, 0.303% of 11,526,100 tons per day of sewage treated in 79 sewage treatment plants. Sludge production has been and will be increasing in accordance with construction of new facilities for sewage treatment. Most of the sludge is currently disposed by landfill and ocean dumping, but it is becoming difficult to find suitable sites for landfill, particularly in big cities such as Seoul. In addition, rapid increase of landfill cost is anticipated in a near future. Current trend for sludge disposal in advanced countries is land application. Over the past 10 to 20 years in the United States, sludge management practices have changed significantly, moving from disposal to beneficial use. They use biosolid for utilization instead of sludge for disposal. Under the Clean Water Act of 1972, amended in 1987 by Congress, the U.S. EPA was required to develop regulations for the use and disposal of sewage sludge. The EPA assessed the potential for pollutants in sewage sludge to affect public health and the environment through a number of different routes of exposure. The Agency also assessed the potential risk to human health through contamination of drinking water sources or surface water when sludge is disposed on land. The Final Rules were signed by the EPA Administrator and were published (Federal Register, 1993). These rules state that sewage sludge shall not be applied to land if the concentration of any pollutant in the sludge exceeds the ceiling concentration. In addition, the cumulative loading rate for each pollutant shall not exceed the cumulative pollutant loading rate nor should the concentration of each pollutant in the sludge exceed the monthly average concentration for the pollutant. The annual pollutant loading rate generally applies to applications of sewage sludge on agricultural lands. The most popular beneficial use of sewage sludge is land application. The sludge has to be stabilized for appling to land. One of the stabilization process for sewage sludge is lime stabilization process. The stabilization process is consisted of the stabilizing process and the drying process. Stabilization reactor can be a drum type reactor in which a crossed mixer is equipped. The additive agents are a very reactive mixture of calcium oxide and others. The stabilized sludge is dried in sun drier or rotary kiln.

• 디지털융복합연구
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• 제16권10호
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• pp.235-241
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• 2018

출력물관리 시스템은 출력시 수집된 출력 로그 내에 개인정보(주민번호, 카드번호)가 존재하는지 패턴을 분석하여 사용자에게 경고 메시지 팝업 전달, 인쇄 강제 종료, 관리자에게 메일 발송 및 별도 로그 관리 기능을 갖추어야 한다. 인증 관리 역시 사용자 PC에 Agent를 설치하여 등록되어 있는 사용자만 프린트가 가능하며, 사용자 정보에 따라 작업이 허가되거나 거절될 수 있도록 제한 기능을 갖추어야한다. 또한 복합기로 프린트/복사/스캔 사용 시 ID카드 인증 후 문서 출력 및 복합기를 사용할 수 있으며, ID카드 미사용시 디바이스에 ID/PW를 입력 인증 후 복합기를 사용할 수 있도록 구축해야한다. 본 연구에서는 기존의 출력물 보안 방법들 보다 더욱 우수한 기술을 갖추고 있는 보안 업체인 (주)와우소프트와 공동으로 인터페이스를 개발하여 기록물관리 시스템을 위한 인터페이스들을 구축하였다. 또한 출력물관리를 위한 필요한 기본 기능들의 인터페이스를 설계하였으며 이를 바탕으로 출력물관리 시스템 구축에 기여하였다.

• 한국지반공학회논문집
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• 제18권5호
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• pp.179-193
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• 2002

폐주물사가 반응벽체의 매체로 쓰였을 때의 중금속, 음이온과 PAMs의 용출 특성을 12개의 폐주물사와 3개의 기준 물질(Peerless iron, local fill soil, and torpedo sand)을 선택하여 batch와 column 실험을 통하여 밝혔다. 3개의 기준 물질은 이들로부터 얻어진 용출특성을 폐주물사와 비교하기 위해 사용되었다. Water leach test와 total elemental analyses로부터 얻어진 결과에 따라 모든 폐주물사는 그룹 2에 속하였다. 하지만, 일반적으로 지하수면 아래에 건설재료로 이용되는 3개의 기준물질도 역시 그룹 2로 분류되었다. 따라서, 폐주물사의 반응벽체에의 사용은 일반적인 건설재료를 지하수면 아래에 사용하였을 시와 비교했을 때에 비해 비슷한 농도의 중금속과 음이온이 용출됨을 알 수 있다.

• 헤리티지:역사와 과학
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• 제34권
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• pp.222-267
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• 2001

The purpose of this document is to explain the revisions of the Protection of Cultural Properties Act and its sub-laws which have been mad from Jan. 1999 to Sep. 2001. The Protection of Cultural Properties Act and its sub-laws have been revised three times from 1999 to 2001, before and after the Office of Cultural Properties was raised to Cultural Properties Administration on May 24, 1999. The main points of the revisions are as follows. First of all, the role of the local autonomous entities has been increased. The governor of the local autonomous entities is entitled to announce administrative orders related to the preservation of State-designated Cultural Properties. Also, the local autonomous entities has the authorities to examine whether the construction work which will be made in the outer boundaries, which is provided by regulations, of the protected area of the cultural properties might have any effect on preservation of cultural properties or not. Second, preventive actions to protect the cultural properties have been strengthened. If the scale of construction work is more than some scale, the preliminary survey of the surface of the earth to confirm the existence of buried cultural properties and their distribution is obligated. One who is promoting the development plan more than some scale must discuss the plan with the Administrator of Cultural Properties Administration in the process of planning. These actions would be effective to prevent the cultural properties from being damaged because of the development. Third, relaxation of the restrictions has been proceeded. On the basis of regulations which specify the actions to affect the preservation of cultural properties, negative system that does not limit the actions which are not specified in the regulations is introduced. The appropriateness of both protected structure and area should be regularly reviewed and adjusted. Also, most of the restrictions which was made only for administrative convenience and over-regulated the people's living have been revised. Finally, the number of cultural properties to be protected has been increased. Besides the State-designated Cultural Properties, the other cultural properties which are worthy to be protected as City-or-Province-designated Cultural Properties can be designated provisionally and protected. The system of registration and maintenance of the buildings and facilities which are not designated as the Modern Cultural Heritages is established. The penalty for damaging and stealing the cultural Properties which are not designated to be protected was strengthened. Even a dead natural monument can be acknowledged as an natural monument and it is limited to make a specimen or stuffing of the dead natural monument. All of these actions are fit to the high level of understanding of the public about the cultural properties and as the result of these actions, the number of cultural properties to be preserved has been increased. To sum up, the directions of revisions of the Protection of Cultural Properties Act and its sub­laws which have been made from Jan. 1999 to Sep. 2001. are the localization of the protection of the cultural properties, the strengthening of protective actions, the relaxation of various regulations and the increasing of the number fo the protected cultural properties. Also, various problems raised in the processes of implementations of the laws have been reviewed and revised.