• 한국통신학회논문지
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• 제29권2A호
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• pp.181-186
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• 2004

2003년 세계전파통신회의(WRC-2003)에서 지상망과 고밀도 고정위성업무(HDFSS:High-Density fixed satellite service)의 주파수 공유 및 HDFSS용 하향링크 후보대역 선정문제로 이슈화된 40 ㎓ 대역에서 정지위성망과 지상망간 주파수 공유에 따른 간섭 영향을 우리나라에서 운용하는 것으로 설정해 분석하였다. 40 ㎓ 대역 정지위성망과 지상망의 전형적인 특성 파라미터를 이용하여 시뮬레이션한 결과, 우리나라 지상 고정업무 무선국의 안테나가 같은 40 ㎓ 대역을 공유하는 정지위성을 향할 경우, 40 ㎓ 지상망의 운용특성들이 맞물려. 간섭을 받을 수 있는 최악의 특정 조건이 이루어질 수 있음을 보았다. 이러한 상황은 고층건물이 밀집된 지역에 지상망을 설치할 때 발생할 수 있으므로. 향후 40 ㎓ 대역의 고밀도 지상고정업무(HDFS :High-Density fixed service) 무선국들이 설치될 때, 정지궤도 지향을 피하는 간섭경감기법이 강구되어야 할 것으로 보인다.

• 농촌계획
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• 제23권3호
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• pp.133-145
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• 2017

The purpose of this study is to assess residents' perception of the revitalization projects of the rural center and to evaluate their views of the projects' importance and their levels of satisfaction with how they have been carried out. In this study, we measured the residents' perceptions and preferences regarding these projects by using Importance-Performance Analysis (IPA). Results showed that residents' perceptions and satisfaction were the highest for the projects providing welfare facilities, even though this project has little relevance to the overall project goal. Residents were dissatisfied with construction projects such as the building of cultural facilities and urban parks, even while recognizing their importance. It is necessary to establish what problem the people perceive and to manage them appropriately. Next, the residents did not appreciate the community empowerment projects, nor did they evaluate the contents of the program positively. It can therefore be seen that the community empowerment projects have not been carried out well. Finally, the street landscape improvement project was not successfully implemented compared to other projects. The residents have negatively perceived the installation of facilities that they do not want, rarely use, or are poorly operated. this shows that the evaluation of residents is significant. They become the users of the revitalization project for the rural center. It is necessary to overcome problems such as project items chosen by professionals without local consultation and obvious design in the revitalization project of the local center. There is a need to ascertain the residents' opinion of each project and to encourage them to participate directly in the management operation.

• 한국학교보건학회지
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• 제22권2호
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• pp.169-181
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• 2009

Purpose: Mood disorders such as depression and bipolar disorder are a major mental health problem in college students. We investigate the prevalence of depression and bipolar disorder and the relevance of risk factors for these mood disorders among one college freshmen. Methods: The subjects were 2,865 college students who entered one university located in Seoul and Ansung in 2009. We used BDI (Beck Depression Inventory) for depression assessment and K-MDQ (Mood Disorder Questionnaire) for bipolar disorder assessment. Demographic and socioeconomic factors were measured by questionnaire. Height, weight, blood pressure, total cholesterol, complete blood cell count, and liver function test data were obtained by physical examination for freshmen. Chi-square test and multiple logistic regression were performed to analyze the possible risk factors for depression and bipolar disorder. Results: With different BDI cutoff value, 16 and 21, the prevalence of depression was 8.7% (male: 7.6%, female: 10.1%) and 2.4% (male: 2.5%, female: 2.3%), separately. 'Low economic status', 'urban birth place', and 'low grade at entrance' were significantly associated with depression. Using the original cutoff criterion, defined as clustering of 7 or more symptoms that caused moderate or severe problems, the prevalence of bipolar disorder was 1.3% (male: 1.4%, female: 1.1%). The risk factor of bipolar disorder was academic fields (art fields). Conclusion: Depression and bipolar disorder are common disease in college freshmen. Therefore, Campus-based mental health service program is needed to help with prevention of and early intervention of these mood disorders.

• 한국측량학회지
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• 제16권2호
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• pp.177-185
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• 1998

도시계획이나 설계에 있어서 건물에 대한 3차원자료와 건물 경계선에 대한 요구가 증가되고 있으며 본 연구에서는 DSM과 입체 항공사진영상을 이용하여 건물을 추출하는 방법을 제시하였다. DSM은 DEM과 같이 지형에 대한 정보를 갖고 있을 뿐만 아니라 주변 지형보다 높은 지상 시설물, 즉 건물이나 나무에 대한 정보도 갖고 있다. 따라서 본 연구에서는 두 단계 처리과정을 제시하였으며, 첫 번째 과정은 최우추정과 동적 프로그래밍을 이용한 매칭기법에 의해 DSM을 생성하는 것이다. 제시된 영상정합기법은 입체영상간의 시차차를 찾기 위해 비용함수를 이용하였으며, 영상정합문제 해결을 위해 동적 프로그래밍을 이용하였다. 두 번째 과정은 Sobel 연산자에 의해 항공사진영상으로부터 추출된 경계선정보와 DSM을 이용하여 건물 경계를 검출하는 것이다. DSM과 Sobel 연산자에 의한 경계선 정보를 중첩분석 한 결과 건물 경계를 효과적으로 추출 할 수 있었다.

• 한국측량학회:학술대회논문집
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• 한국측량학회 2004년도 추계학술발표회 논문집
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• pp.557-563
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• 2004

Korean cadastral system keeps graphical maps made by the plane table method from 1910's. The fact is that the graphical maps grafted on paper cover about 95% of the whole land (MOGAHA, 1999). The needs are arising to transform the graphical cadastre to a digital one in compliance with modem technologies. Korean government has already digitise the old maps until last year. A nation-wide land information system, Parcel-based Land Information System, was established upon the digitised map database. However, the accuracy of the digitised coordinates hardly meet the citizens' needs because it cannot exceed that of the paper maps. The definite solution will be surveying all the parcels again and making new digital maps. However, commencing a project for resurveying 34 million parcels will require enormous amount of time and manpower. The strategy should be dividing the country into county-wise or grid-wise pieces and surveying one piece by one piece. Municipal governments of counties, cities or urban districts will be the propelling bodies of the project but the costs will hardly be affordable at a time. For the purpose of resolving the financial problem, each municipality can split its own project into smaller pieces by year base. There is accordingly a great possibility to create inconsistency over the divided project areas caused by different techniques applied, different equipments used and/or mismatches between the project borders. It provides some merits at the same time. The people in project completion areas will be satisfied with the enhanced accuracy and feel safe in land transaction and, in turn, soundly improves overall nation-wide economic situation. Therefore, the main issue of the thesis shows how to make the cadastral re-survey project scalable. Guidelines for how to perform the projects will be derived from a experienced case.

• 한국건축시공학회지
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• 제20권4호
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• pp.347-355
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• 2020

베트남의 경제 성장률과 도시인구는 꾸준히 증가함에 따라 베트남의 인프라 개발 건설 시장 규모는 더욱 커질 전망이다. 그러나 인프라 개발을 위한 베트남 정부는 재정 및 행정 능력의 한계로 이러한 문제를 해결하기 위한 방안으로 PPP를 채택하고 있다. PPP는 10년 이상 지속되는 장기 사업으로 사업 실패 시 장기적 큰 피해가 될 수 있어 위험관리가 매우 중요하다. 본 연구에서는 리스크 관리에 대한 리스크 요인의 영향과 관리정도 분석에 SOM분석을 제안한다. SOM분석 방법은 시각화 분석으로, 각 리스크 요인의 색상 패턴을 통해 상관 분석이 가능하다. 본 연구는 SOM을 활용하여 베트남 PPP 사업의 위험요인의 우선순위를 결정하고자 한다.

• 한국지반신소재학회논문집
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• 제11권2호
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• pp.21-30
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• 2012

본 논문에서는 2009년도 인천지역 토양오염 실태조사에 따른 오염 분포도를 분석하였다. 인천 남동국가 산업단지, 부평 이전 미군기지, 서구 매립지 등에서는 유류저장 시설, 자동차 및 유리 산업화, 군부대 시설에 따른 유류 및 중금속 유출 등의 산업 및 경제 활동으로 토양오염 분포도가 다소 높게 조사되었다. 특히 인천의 토양오염 우려 지역을 대상으로 수치해석을 통한 장래 오염 평가를 하였다. 향후 5년 후 불소와 석유계총탄화수소의 오염은 점차 정화 될 것으로 판단되지만, 오염지역의 관리가 소홀하거나 주변지역으로 유출시 이 기간 내에 주변 확산과 시간경과에 따른 오염 진행은 커질 것으로 판단된다.

• 제어로봇시스템학회논문지
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• 제22권10호
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• pp.859-868
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• 2016

This paper proposes a new global positioning system (GPS) receiver algorithm to improve the positioning accuracy of a transporter using fault detection and isolation techniques from satellite signals. To improve the positioning accuracy, several factors including a feasible number of satellite signals, SNR, NAV Measurement Quality Indicator (mesQI), and Doppler, among others, have been utilized in the proposed algorithm. To increase the number of feasible satellite signals, an erroneous satellite signal has been replaced by the previous one. In conventional approaches, received GPS signals are analyzed and directly determined to be contaminated or not. The only clean signals are utilized for identifying the current location. This fault detection and isolation (FDI) feasibility test is popular for commercial GPS receivers. In the urban environment, especially near a building, the feasible number of satellite signals becomes insufficient to position the transporter. To overcome this problem, satellite signals are efficiently selected and recovered. Additionally, using the proposed GPS receiver algorithm, a feasible number of satellite signals can be increased, thereby improving the positional accuracy. Real world experiments using a transporter that carries blocks in a shipyard have demonstrated the superiority of the proposed algorithm compared to conventional approaches.

• 한국화재소방학회논문지
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• 제30권5호
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• pp.36-45
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• 2016

일체형 방화셔터는 피난과는 무관하게 무분별하게 설치되고 있다. 학교 건축물의 복도, 통로, 계단 등에 주로 적용하고 있어 학생들이 사고의 위험에 언제나 노출된 상태이다. 따라서 부천옥길과 화성동탄에 있는 초등학교와 중학교에 설치된 방화셔터의 설치현황과 방화셔터 관련 사고사례를 조사하여 일체형 셔터의 출입구 및 피난, 시공관리, 유지관리의 문제점을 파악하였다. 피난자가 출입구 위치를 쉽게 확인할 수 있도록 바닥에 통로유도등 또는 표지를 설치하고, 방화셔터에 장애물 감지장치를 설치하여 셔터에 깔리는 인명피해를 줄이도록 하였고, 방화셔터의 성능시험 확대, 방화셔터의 성능을 유지하기 위해 주 또는 월 1회 정도 성능시운전을 시행, 스프링클러설비는 $1000m^2$를 넘는 4층 이상에만 설치할 것이 아니라 학교용도는 규모에 관계없이 전 층에 반영하여 방화셔터 설치개소를 최소화하는 방안을 제안하고자 한다.

• 기술사
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• 제16권3호
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• pp.41-53
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• 1983

The Dangri Crushed Stone Quarry is located in Dangridong, Busan City, and around the estuary of the Nagdong River. The quarry is considered to be a very promised one in the urban area from the standpoints of the assessment of the aggregate rank, the environmental impacts and the transportation distance. The crushed stones for aggregate of the quarry marks the higher rank in the gravity, the absorption ratio, the abrasion ratio, and the stability in comparison with the JISA 5005. The basement vibrations of the residential section in the vicinity of the quarry, which are arised by the millisecond blasting at the quarry site using the gelatin dynamites less than 39kg in weight, are measured to assess the vibration nuisance. The values of acceleration and the magnitudes are less than eight gals and O on the Richter scale respectively, the vibration nuisance thus can be ignored in such scales of the experiments. The traffic vibrations of the residential section are slightly susceptible. In the experiments, the traffic vibrations appears to be sensibler to the basement than the explosion vibration. The explosion noises in the experiments are not checked not only on the RION Sound Level Meter but also to our ears. The values of traffic noises also are in the safety values of the noise nuisance. The crush dust suspends in the air toward the upper valley in the opposite side of the residential area because of the influences of the sea breeze and the valley wind in the daytime, and the monsoon and the topographic disposition. the dust nuisance thus would not be remained in problem. The quarry is operated in the daytime only. The traffic dust in the residential area will be reduced by the faultless pavement and the careful driving. The elaborate survey on the ridges and peaks surrounded the quarry is recommended to prevent in advance the accidents of the rock slide. Moreover, it is required to make an advisory committee to develop the industry and to save the techniques. The most important matter is the accomodation between the attitude of the enterprising man for the social responsibility to the public nuisance and the cooperative spirit of the inhabitants for the industry.