• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2017년도 추계학술대회
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• pp.199-200
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• 2017

eLoran 테스트베드의 국제적 요구성능을 충족하기 위해서는 선박 입출항 항로의 ASF 측정뿐만 아니라 보정정보의 제공을 통해 사용자의 위치정확도를 개선시켜야 한다. 항만을 입출항하는 선박의 항법요구 성능인 국제해사기구(IMO)의 HEA (Harbor Entrance and Approach) 요구성능은 10미터 이내의 측위정확도를 요구하고 있다. 그러므로 본 논문에서는 eLoran 테스트베드 내에서 신규 송신국 및 보정기준국(Differential Loran Station)의 위치에 따른 IMO HEA 측위정확도 성능 도달 가능성에 대해 시뮬레이션을 통해 예측해 본다.

• 한국보건간호학회지
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• 제22권1호
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• pp.121-130
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• 2008

Purpose: Immunization is one of the simplest and most effective approaches for protecting the health of children from preventable infectious disease. This study assessed the immunization statuses of children presenting to childcare centers in Korea and compared the sociodemographic factors of children with age-appropriate immunization for DTaP4 with those with delayed immunization for DTaP4. Method: A national mail survey was used to collect data on the children's immunization history and sociodemographic information. A total of 248 mothers returned completed questionnaires for their children. Results: The overall immunization coverage for HepB, a series of DTaP and polio and varicella was above 95%. However, the percentage of age-appropriate immunizations of vaccines ranged from 45.3% to 69.0% depending on the vaccines. Only the age of the child was a significant factor for delayed immunization for DTaP4. Conclusion: To fully protect children from vaccine-preventable disease, childcare providers can playa role in monitoring the immunization statuses of children in their care centers to ensure that they all receive all childhood immunizations on time.

• ETRI Journal
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• 제35권6호
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• pp.1084-1093
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• 2013

problem of pedestrian localization using mobile nodes containing impulse radio ultra wideband (IR-UWB) is considered. IEEE 802.15.4a-based IR-UWB can achieve accurate ranging. However, the coverage is as short as 30 m, owing to the restricted transmit power. This factor may cause a poor geometric relationship among the mobile nodes and anchor nodes in certain environments. To localize a group of pedestrians accurately, an enhanced cooperative localization method is proposed. We describe a sequential algorithm and define problems that may occur in the implementation of the algorithm. To solve these problems, a batch algorithm is proposed. The batch algorithm can be carried out after performing the sequential algorithm to linearize the nonlinear range equation. When a sequential algorithm cannot be performed due to a poor geometric relationship among nodes, a batch algorithm can be carried out directly. Herein, Monte Carlo simulations are presented to illustrate the proposed method and verify its performance.

• 천문학회지
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• 제26권2호
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• pp.89-98
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• 1993

Magnetostatic models of starspots of late type main sequence stars$(G5V\~K5V)$ have been constructed to investigate their physical characteristics by using the similarity law suggested by Schluter and Temesvary(1958) and later employed by Deinzer(1965) and Yun(1968). The starspots are assumed to be single, circular and in horizontal magnetostatic equilibrium. In the present study we considered only those model spots whose area covers less than $12\%$ of the entire stellar surface as suggested by observations. The computed surface field strength of our model spots ranges from $10^3$\;to\;several\;10^3$ gauss and their magnetic flux is found to be $10\~100$ times that of sunspots. The field strength is sensitive to spectral type, which increases with later spectral type. In contrast to the field strength, the area of starspots depends strongly on the total magnetic flux. Finally, it is noted that the computed field strength of model spots belonging to $G0V\~G5V$ falls below the equipartition field strength at their parent stellar surface unless the coverage is less than $2\%$. This suggests that the observed spot on $G0V\~G5V$ stars is likely to be a group of small starspots.

• 한국보건간호학회지
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• 제24권1호
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• pp.49-60
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• 2010

Purpose: This study investigated the quality of life, mental health and subjective health status of community dwelling cancer patients. Methods: Subjects were 212 out-patients with cancer at Kangwon University Hospital. The study was conducted from July 10 to August 14, 2008. Quality of life as determined by the Euro Quality of life-5 Dimensions (EQ-5D) was measured using Korea Centers for Disease Control and Prevention(KCDC). Mental health and subjective health status were measured using KCDC. Results: EQ-5D determined degrees of difficulty were 25.5%(mobility), 25.2%(anxiety or depression), 23.6%(pain or discomfort), 20.3%(activities of daily living), and 13.7%(self care). An analysis of the association between several factors and mental health showed that the statistically significant factors were age, gender, medical coverage, and private insurance. An analysis of the association between several factors and subjective health status showed that the statistically significant factor was occupation. Conclusion: Cancer patients suffer from significant psychological distress. Programs that address mental and physical health would be beneficial.

• Journal of Ecology and Environment
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• 제42권1호
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• pp.12-19
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• 2018

Background: The objective of this study was to determine the relationship between soil environmental factors and halophyte distribution in the west coast of South Korea. Soils of our study sites were categorized into two groups: salt marsh and estuary marsh. Results: Salinity was higher in the salt marsh group than that in the estuary marsh group. However, total nitrogen, silt, and clay contents were higher in the estuary marsh group than those in the salt marsh group. Although altitude had a wider range in the salt marsh group, the mean altitude was higher in the estuary marsh group than that in the salt marsh group. Annual halophytes of seed propagation species were distributed parallel to the coast line on salt marsh. Higher coverage of vegetation was found in the area closer to the coast line. Plant density was higher near dead parental plants in estuary marsh, showing less difference in area that was more distant from the coast line. Conclusions: Results of canonical correspondence analysis (CCA) for vegetation distribution and sediment environmental factors and germination analysis in the coast line showed significant relationship with halophyte distribution. Therefore, they can be used as an indicator of coastal plant movement due to sea level rise.

• 한국조경학회지
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• 제44권3호
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• pp.1-12
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• 2016

본 연구는 설악산 국립공원 내 44번 국도를 대상으로 로지스틱 회귀분석을 실시하여 로드킬이 발생한 지역의 공간적 특성을 분석하고, 분석 결과의 적합도 및 예측도를 평가하여 로드킬 발생 근본 원인을 파악하고자 하였다. 2008년부터 2013년까지 구축된 81개의 로드킬 데이터를 종속변수로 설정하고, 선행연구 및 현장조사를 통해 도출한 경사, 향, 식생, 백두대간 등의 자연환경 요인과 펜스 옹벽 등의 인공시설물, 경작지, 주거지역 등의 토지이용 변수를 독립 변수로 설정하고, 로지스틱 회귀분석을 실시하여 회귀식을 추정하였다. 식생 영급, 하천으로부터의 거리, 펜스 옹벽 등의 설치구간, 주거지역 건물 등의 시설로부터의 거리가 로드킬에 영향을 미치는 변수로 선택되었다. 회귀모형에 포함된 모든 변수들은 유의수준(p<0.01)을 충족하였다. 회귀모형에서 로드킬 발생에 가장 큰 영향력을 보인 변수는 펜스 옹벽 등의 설치구간(회귀계수: -1.0135)으로 나타났으며, 가장 낮은 영향력을 보인 변수는 식생 영급(회귀계수: 0.0001)으로 나타났다. 즉, 펜스 옹벽 등의 설치 구간에서는 로드킬이 일어날 확률이 낮으며, 주거지역 건물 등의 시설로부터의 거리가 가까울수록, 하천으로부터의 거리가 가까울수록, 식생 영급이 커질수록 로드킬 발생이 높아질 수 있다. 추정된 로지스틱 회귀모형 결과로부터 로드킬이 일어날 것이라고 옳게 예측한 확률은 74.1%, 로드킬이 일어나지 않을 것이라고 옳게 예측한 확률은 70.4%로 나타났다. 전체적으로는 옳게 분류한 확률은 72.2%로 비교적 높은 비율을 보였다. 본 연구를 통해 로드킬 저감을 위한 계획 및 정책 수립, 방지시설 설치 계획 등의 공간의사 결정에 객관적 근거로 도움을 줄 수 있을 것으로 사료된다.

• Asian Pacific Journal of Cancer Prevention
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• 제14권6호
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• pp.3581-3585
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• 2013

Background: Accurate statistics on the cancer burden are essential, both for purposes of research and for setting priorities in healthcare management. So that in vast countries with partial registration coverage, such as Iran, local data are more useful. We here estimated the incidence, prevalence and mortality time trend of four major cancer site, lung, stomach, breast and prostate, over the period 2001-2010 and provided short-range projections to 2015 in Isfahan. Materials and Methods: Estimates were derived by applying the mortality-incidence analysis method, a back-calculation approach to estimate and project incidence, prevalence and mortality of chronic degenerative disease, starting from knowledge of mortality and relative survival information. Results: Age adjusted incidence, mortality and prevalence rates in Isfahan exhibited a clear upward trend for all four sites during the period 2001-2015, with marked increasees in prostate and breast predicted for the future. Difference in incidence trends between males and females might be attributable to the difference in risk factors specific to certain cancer sites, with smoking being the main risk factor. Conclusions: In this study, males and females displayed an increasing pattern for incidence and mortality rate over the entire study period until 2015. This information can be used as basis for planning healthcare management and allocating recourses in public health.

• ETRI Journal
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• 제40권3호
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• pp.318-329
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• 2018

Femtocell (FC) technology envisaged as a cost-effective approach to attain better indoor coverage of mobile voice and data service. Deployment of FCs over macrocell forms a heterogeneous network. In urban areas, the key factor limits the successful deployment of FCs is inter-cell interference (ICI), which severely affects the performance of victim users. Autonomous FC transmission power setting is one straightforward way for coordinating ICI in the downlink. Application of intelligent control using soft computing techniques has not yet explored well for wireless networks. In this work, autonomous FC transmission power setting strategy using Adaptive Neuro Fuzzy Inference System is proposed. The main advantage of the proposed method is zero signaling overhead, reduced computational complexity and bare minimum delay in performing power setting of FC base station because only the periodic channel measurement reports fed back by the user equipment are needed. System level simulation results validate the effectiveness of the proposed method by providing much better throughput, even under high interference activation scenario and cell edge users can be prevented from going outage.

• Communications for Statistical Applications and Methods
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• 제24권3호
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• pp.211-226
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• 2017

The chain-ladder method, for which run-off data is employed is popularly used in the rate-adjustment and loss-reserving practices of non-life-insurance and health-insurance companies. The method is applicable when the underlying assumption of a consistent development pattern is in regards to a cumulative loss payment after the occurrence of an insurance event. In this study, a modified chain-ladder algorithm is proposed for when the assumption is considered to be only partially appropriate for the given run-off data. The concept of a structural-change point in the run-off data and its reflection in the estimation of unpaid loss amounts are discussed with numerical illustrations. Experience data from private health insurance coverage in Korea were analyzed based on the suggested method. The performance in estimation of loss reserve was also compared with traditional approaches. We present evidence in this paper that shows that a reflection of a structural-change point in the chain-ladder method can improve the risk management of the relevant insurance products. The suggested method is expected to be utilized easily in actuarial practice as the algorithm is straightforward.