• 한국항해항만학회지
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• 제48권4호
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• pp.261-266
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• 2024

여객선 이용객이 해마다 증가함에 따라 여객선 항로 교통안전이 관심이 커지고 있다. 여객선은 많은 사람이 이용하는 다중이용선박으로 각별히 안전에 대한 주의가 요구되며 대형피해를 예방, 저감하기 위해서 해양교통에 따른 사고 대비책을 강구해야 한다. 해양에서 부유물에 의한 감김 사고를 줄이기 위하여 많은 노력을 기울이고 있으나, 여전히 사고는 확연히 줄어들지 않고 있다. 이번 연구에서는 초분광 카메라를 활용하여 부유물을 식별하는 기술에 대한 이론적 검토 결과를 제시하고자 한다. 드론의 기술과 활용가능성을 검토하였다. 또한 편광필터, 초분광 카메라 활용을 검토하였다. 검토 결과 부유물 식별에 초분광 이미징 기술 적용이 가능하며 향후에 해수면 빛 반사 정도를 측정하고, 물체로 부터의 고유의 빛 파장에 대한 연구가 추가로 필요하다는 결론을 얻었다.

• 보건의료생명과학 논문지
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• 제11권2호
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• pp.449-455
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• 2023

본 연구는 중년 성인의 대사증후군 유무에 따른 운동 관련요인의 차이를 분석하고자 하였다. 국민건강영양조사 제7기(2016-2018) 원시자료 중 중년 성인 5,421명 중 응답이 불충분한 903명을 제외한 4,518명을 최종 분석대상자로 선정하였다. 연구결과 여성, 교육수준이 낮을수록, 주관적 건강상태가 낮을수록, 신체활동은 적을수록 대사증후군과 매우 유의한 관련성이 있었다. 본 연구결과로부터 중년 성인의 대사증후군 예방 및 관리를 위해서는 적극적인 신체활동이 필요하다고 판단되며, 향후 더 다양한 요인분석과 다면적인 연구가 필요하다고 사료된다.

• 한국응급구조학회지
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• 제13권1호
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• pp.35-48
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• 2009

Purpose: Firefighters were subjected to be exposed to 24-hour shiftwork and high level of job stress, but there is little study of fire fighters about between Job Stress and Psychological stress in Korea. This study was performed to evaluate job stress of fire fighters grouped by different job types and analyze the health effect of job stress by using a PWI-SF(Psycho-social Well-being Index, Short Form). Methods : This study was to measure the degree of job stress and socio-psychological stress of firefighters working at 119 safety center and analyze the relationship between job stress and mental health, through self-administered questionnaire survey on 918 fire fighters working at fire department located in Korea, during October in 2008. Question items of the questionnaire consist of general characteristics, job stress, and socio-psychological stress. Job Stress Measurement Scale for Koreans was used to measure job stress, while PWI-SF used for socio-psychological stress. Collected data was analyzed through frequency analysis, ${\chi}^2$ test, one-way ANOVA, correlation analysis, multi-regression analysis using a statistic program, SPSS/10.0 Ver for Windows, and statistical significance level was 0.05. Result : Accordingly, this paper is written for the purpose of scrutinizing the reason of 119 rescuers' job stress and Socio-Psychological stress. This thesis tries to analyze a problem and provide contents through many variables concerned and theoretical investigation with the actual research of questionnaire. The results of the study are summarized as follows : Fire fighters feel relatively high stressful in their performance. Job stress, organizational commitment and burnout did not have been influence upon by individual cases such as economic condition, regular exercise etc. Finally, as a result of step by step regression analysis, the variable that can explain Socio-Psychological stress the best was negative emotion scale(NE). Conclusions : It is necessary to conduct repeated studies in the future, since the study implied that there was a contrary relationship between job stress and socio-psychological stress. In order to reduce job stress and maintain better mental health, it is more important than anything else to help firefighters have willingness and efforts to sustain a healthy life, so the development of various programs and education to raise their awareness should be implemented.

• 유통과학연구
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• 제12권4호
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• pp.31-39
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• 2014

Purpose - This study investigates the following two issues. First, we attempt to find the important determinants of housing investment and to identify their significance rank using survey panel data. Recently, the expansion of global uncertainty in the real estate market has directly and indirectly influenced the Korean housing market; households demonstrate a sensitive reaction to changes in that market. Therefore, this study aims to draw conclusions from understanding how the impact of financial strength of the household is related to house investment. Second, we attempt to verify the effectiveness of diverse indices of financial strength such as DTI, LTV, and PIR as measures to monitor the housing market. In the continuous housing market recession after the global crisis, the government places top priority on residence stability. However, the government still imposes forceful restraints on indices of financial strength. We believe this study verifies the utility of these regulations when used in the housing market. Research design, data, and methodology - The data source for this study is the "National Survey of Tax and Benefit" from 2007 (1st) to 2011 (5th) by the Korea Institute of Public Finance. Based on this survey data, we use panel data of 3,838 households that have been surveyed continuously for 5 years. We sort the base variables according to relevance of house investment criteria using the decision tree model (DTM), which is the standard decision-making model for data-mining techniques. The DTM method is known as a powerful methodology to identify contributory variables for predictive power. In addition, we analyze how important explanatory variables and the financial strength index of households affect housing investment with the binary logistic multi-regressive model. Based on the analyses, we conclude that the financial strength index has a significant role in house investment demand. Results - The results of this research are as follows: 1) The determinants of housing investment are age, consumption expenditures, income, total assets, rent deposit, housing price, habits satisfaction, housing scale, number of household members, and debt related to housing. 2) The impact power of these determinants has changed more or less annually due to economic situations and housing market conditions. The level of consumption expenditure and income are the main determinants before 2009; however, the determinants of housing investment changed to indices of the financial strength of households, i.e., DTI, LTV, and PIR, after 2009. 3) Most of all, since 2009, housing loans has been a more important variable than the level of consumption in making housing market decisions. Conclusions - The results of this research show that sound financing of households has a stronger effect on housing investment than reduced consumption expenditures. At the same time, the key indices that must be monitored by the government under economic emergency conditions differ from those requiring monitoring under normal market conditions; therefore, political indices to encourage and promote the housing market must be divided based on market conditions.

• 대한전자공학회논문지SD
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• 제43권12호
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• pp.23-32
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• 2006

다층 고속 디지털 보드에 대한 빠르고 정확한 전압 버스 설계 방법은 정확하고 정밀한 고속 보드에 전원 공급망 설계 방법을 위해 고안되었다. FAPUD는 PBEC(Path Based Equivalent Circuit)모델과 망 합성 방법의 두 중요 알고리즘을 기반으로 구성된다. PBEC 모델 기반의 회로 레벨의 2차원 전원 분배 망의 전기적 값으로부터 lumped 1차원 회로 모델로 간단한 산술 표현들을 활용한다 제안된 PBEC 기반인 회로 단계 설계는 제안한 지역 접근법을 이용해 수행된다. 이 회로 단계 설계는 온칩 디커플링 커패시터의 크기, 오프칩 디커플링 커패시터의 위치와 크기, 패키지 전압 버스의 유효한 인덕턴스를 직접 결정하고 계산한다. 설계 출력에 따라 모든 디커플링 커패시터가 포한된 lumped 회로 모델과 전압 버스의 레이아웃은 FAPUD 방법을 이용한 후 얻을 수 있다. 미세조정 과정에서, I/O Switching에 의해 덧붙여진 Simultaneous Switching Noise(SSN)를 고려한 보드 재 최적화가 수행될 수 있다 이는 전원 공급 잡음에 I/O 동작 효과가 lumped 회로 모델을 가지고 전 동작 주파수 범위에 대해 추산될 수 있기 때문이다. 게다가 만약 설계에 조정이 필요하거나 교체해야 한다면, FAPUD 방법은 다른 전면 설계변경 없이 디커플링 커패시터들을 대체하여 설계를 수정하는 것이 가능하다. 마지막으로 FAPUD 방법은 전형적인 PEEC 기본설계 방법과 비교해 정확하고 FAPUD 방법의 설계 시간은 전형적인 PEEC 기본 설계 방법의 시간보다 10배가 빠르다.

• 한국해양공학회지
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• 제33권6호
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• pp.518-525
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• 2019

Recently, the Sub-Committee on SDC (Ship Design and Construction) of IMO have discussed actively the technical issues associated with the second-generation intact stability criteria of ships. Generally, second generation intact stability criteria refer to vulnerability five modes ship stability which occurs when the ship navigating in rough seas. As waves passes the ship, dynamic roll motion phenomenon will affect ship stability that may lead to capsizing. Multi-tiered approach for second generation of intact stability criteria of IMO instruments covers apply for all ships. Each ship is checked for vulnerability to pure loss of stability, parametric roll, and broaching/surf-riding phenomena using L1(level 1) vulnerability criteria. If a possible vulnerability is detected, then the L2(level 2) criteria is used, followed by direct stability assessment, if necessary. In this study, we propose a new method to verify the criteria of the surf-riding/broaching mode of small ships. In case, L1 vulnerability criteria is not satisfied based on the relatively simple calculation using the Froude number, we presented the calculation code for the L2 criteria considering the hydrodynamics in waves to perform the more complicated calculation. Then the vulnerability criteria were reviewed based on the data for a given ship. The value of C, which is the probability of the vulnerability criteria for surf-riding/broaching, was calculated. The criteria value C is considered in new approach method using the Froude-Krylov force and the diffraction force. The result shows lower values when considering both the Froude-rylov force and the diffraction force than with only the Froude-Krylov force was considered. This difference means that when dynamic roll motion of ship, more exact wave force needs considered for second generation intact stability criteria This result will contribute to basic ship design process according to the IMO Second-Generation Intact Stability Criteria.

• 한국산학기술학회논문지
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• 제17권6호
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• pp.379-388
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• 2016

무용을 전공하는 고등학생과 대학생들은 처해진 상황과 추구하는 목표가 달라서 종류가 다른 스트레스를 받을 것으로 사료된다. 이에 따라 고등학교 및 대학교에 재학 중인 무용전공 학생들의 다차원적 완벽주의와 섭식장애의 관계를 분석하는데 본 연구의 목적이 있다. 섭식장애는 Garner(1990)의 Eating Disorder Inventory-2(EDI -2)를 이임순(1998)이 번안한 설문지를 사용하였고, 다차원적 완벽주의 성향의 측정은 Frost 등(1990)의 Multidimensional Perfectionism Scale(F-MPS)를 현진원이 번역한 것에 연구자가 연구의 목적에 부합하도록 일부 표현을 수정 보완하여 사용하였다. 이를 위해 218명의 무용전공 여학생을 대상으로 설문을 실시하였으며 회수된 250부 중에서 불성실하게 응답한 32부를 제외한 최종 218부를 가지고 SPSS 21.0 으로 분석하였다. 연구결과 높은 학력과 오래된 경력을 가진 무용학생일수록 다차원적 완벽주의와 섭식장애에 영향을 미치는 것으로 나타났으며, 다차원적 완벽주의(실수에 대한 염려, 개인의 기준, 부모의 기대)는 무용학생들이 지니고 있는 섭식장애의 발생과 유지에 주된 역할을 하는 변인임을 알 수 있었다. 이상의 결과를 종합해면, 높은 학력과 오래된 경력을 가진 무용학생들은 무용수행에서 오는 과도한 스트레스와 왜곡된 신체상의 심리적 압박감을 받아 다차원적 완벽주의와 섭식장애에 영향을 미친 것으로 보이며, 따라서 올바른 체중조절 방안과 섭식장애를 예방하는 프로그램의 적극적인 대책이 필요한 것으로 사료된다.

• Restorative Dentistry and Endodontics
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• 제27권4호
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• pp.421-431
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• 2002

C-shaped canal configuration is very difficult to treat because that clues about preoperative canal anatomy cannot be ascertained from clinical crown morphology and limited information can be derived from radiographic examination. This study was done to get more informations about the root and canal configuration of C-shape root by 3-dimensionally reconstructing for the purpose of enhancing success rate of endodontic treatment. 30 mandibular molars with C-shaped root were selected. Six photo images from occlusal, apical, mesial, distal, buccal, lingual directions and radiographic view were taken as preoperative ones to compare them with 3-D image. After crown reduction to the level of 1-2mm over pulpal floor was performed, teeth were stored in 5.25% sodium hypochlorite solution for the removal of pulp tissue and debris. They were cleaned under running water, allowed to bench dry and embedded in a self-curing resin. This resin block was serially ground with a microtome (Accutom-50, Struers, Denmark) and the image of each level was recorded by digital camera (FinePix S1-pro, Fuji Co., Japan). The thickness of each section was 0.25mm. Photographs of serial sections through all root canal were digitized using Adobe Photoshop 5.0 and then minimum thickness of open and closed sites were measured (open site is the surface containing occluso-apical groove closed site is oppsite). After dizitization using 3-D Doctor (Able software Corp, USA). 3D reconstruction of the outer surface of tooth and the inner surface of pulp space was made. Canal classsification of C-shaped roots was performed from this 3-D reconstructed image. The results were as follows : 1. Most C-shape rooted teeth showed lingual groove (28/30). 2 According to Vertuccis' calssification, type I, II, III, IV, VII were observed. but also new canal types suck as 2-3-2, 1-2-3-2. 2-3-2-1, 2-3-2-3 were shown. 3 There was little difference in minimum thickness on coronal and apical portions, but open site were thinner than closed site on mid portion. Conclusively, 3D reconstruction method could make the exact configurations of C-shape root possible to be visualized and analyzed from multi-directions. Data from minimum thickness recommend cleaning and shaping be more carefully done on dangerous mid portion.

• 디자인학연구
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• 제20권3호
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• pp.141-150
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• 2007

본 연구는 수량에 의한 수면폭의 변화로 인한 하천경관의 시각적 선호도에 미치는 선호요인을 파악하기 위하여 "주변 환경이 일정할 때 수량에 의한 수면폭은 어떠한 요인에 의해 선호되어지는가?"에 대한 연구의문에서 출발하여 영산강경관의 수면폭에 미치는 선호요인을 구명하고 가장 선호되어진 경관의 수면폭/하폭비를 산정하여 시각적 선호도에 의한 필요유량을 산정하였다. 수면폭 변화에 따른 영산강 경관의 시각적 선호요인 변수는 먼저 영산교의 경우 개방감 인자, 물리적 특성 인자, 복잡성 인자 등 3개의 변수, 임곡교의 경우 복잡성 인자, 심미성 인자, 물리적 특성 인자 등 3개 변수로서 모두 유의성이 있는 것으로 판명되었다. 다중회귀모형에서 도시하천경관일 경우 물리적영향이 시각적 선호도에 가장 크게 영향을 미치며, 자연하천경관일 경우 복잡성정도가 가장 크게 영향을 미치는 것으로 나타났다. 또한 필요유량의 수면폭/하폭비는 0.5에서 0.7정도의 비율을 가장 선호하는 것으로 나타났다. 수면폭 변화에 따른 영산강 경관의 시각적 평가에 의한 요인 분석 결과와 하천의 필요유량은 하천경관을 조성하는데 많은 기여를 할 것이며, 이용자의 만족을 극대화할 수 있을 것이다.

• The Journal of Korean Physical Therapy
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• 제10권1호
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• pp.75-80
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• 1998

To survey the recognition of Community Based Rehabilitation (CBR) by Public Health Center(PHC) Physical Therapists in Kyoungki Province. This study analysed general characteristic of Physical Therapists and congnition, participation, education, problems and requireanents for CBR. The objects of this study were 37 therapists who work at 27 of 39 PHC in Kyoungki province and data was collected for 20days from Jan. 12 to 31. 1998 and the results computed from 32 responses. First, Female therapists outnumber males. The age category 30 to 35 old represneted $56.2\%$ of the total number studied. $59.4\%$ of therapists had worked more than 7 years and therapists usually$(46.9\%)$ worked from 6 month to 2 years at the PHC. Junior college graduates were $84.4\%$, and respondents with family responsibilirt were $65.6\%$. Second, Recently pain control has become the major requirment of patiants at PH$(53.1\%)$. If they offered expaneded services - a rehabilitation program $(53.1\%)$, home vistation $(31.3\%)$. when asked about a working guide book, nobody had one. Third, $68.7\%$ of therapists were aware of the present level of CBR, $40.9\%$ of them had gotten an information from educated colleagues, and $68.7\%$ of therapists were aware of the present level of CBR, $86.4\%$ of therapists felt responsible to provide rehabilitation Fourth, For CBR, $93.7\%$ had positive ideas in which they could participate. $73.3\%$ wished to composed a team of various rehabilitational specialists. $73.3\%$ wished for the meeting day to be flexible and $86.6\%$ desired to meet once or twice a week. Fifth, Almost all$(96.9\%)$ desired more educational opportunity about CBR. Example, once or twice a year$(56.2\%)$ and training period of 4-7 days $(43.7\%)$. They wanted to learn theory and practice together$(74.2\%)$ and $74.2\%$ wanted the mational multi-rehabilitation center as a educational managing organization. Sixth, The most important requirment for accomplishing CBR by physical therapists was job security and an adequate number of therapists$(84.4\%)$ Required number of physical therapists in the PHC was 3 $(43.7\%)$. The cooperative agency should be the district goverment organization $(56.2\%)$. Factors inhibiting the execution of CBR were lack of administrative support, physical therapists, and equipments for pain control and for therapeutic exercise.