• Journal of Korean Society of Forest Science
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• v.94 no.1 s.158
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• pp.26-33
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• 2005

The study was carried out to provide information about growth and ecological characteristics by site types of natural deciduous forest in Pyeongchang, Gangwon Province. The data were collected from four aspects(the East, the West, the South, and the North) with three elevation(higher than 1.000 m, 700~1,000 m, lower than 700 m) and three topographical conditions(ridge, hill, and valley). Growth parameters by site types were evaluated based on the growth performances of dbh for the last 5 to 10 years; which were also estimated based on both Pressler and Schneider formulae. In addition, ecological characteristics such as Shannon-Wiener's diversity index, evenness index and richness index were analyzed by site types. The management methods by site types were suggested by considering stand density, growth patterns, and ecological characteristics. It was found that the stands on the South and the East are necessary the tending practices to improve growth and ecological characteristics. On the other hand, the West and the North needed the tending practices focusing on stand density management to increase growth rate rather than ecological management. It was also found that the area lower than 700 m in elevation showed Higher growth rate than other areas. As a management standard considered in terms of growth rate, it was suggested that tending practices should be applied to the stands of which growth rate for the last 5 to 10 years were lower than 2%. Considering topographical conditions, valley area showed better ecological characteristics than both ridge and hilly areas. Consequently, it was revealed that the valley areas were suitable for the ecological management.

• Journal of Korea Water Resources Association
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• v.38 no.8 s.157
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• pp.665-674
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• 2005

The aim of this study is to evaluate 3 types of sedimentation basins: dredging, shield skirt and auxiliary dam, constructed at inlets of two irrigation reservoir and to estimate the most beneficial type and fitted size, SAR(surface to area ratio), for pollutant removal efficiency(RE). For this, RE of major water quality items and change of physicochemical properties in sediments before and post construction of sedimentation basin(SB) were investigated. RE depended on SB types, water quality items and survey times with wide range from $-87\%$ to $92\%$. Long term overall removal efficiency by ROC(regression of concentration) method were $18\%$ in dredging, $29\%$ in shield skirt and $42\%$ in auxiliary dam type. There was a change of physicochemical properties in sediments at auxiliary dam type, while a slight change at dredging and shield skirt type. In comparison to RE, SAR and hydraulic retention time at 3 types of SB, auxiliary dam type was the most beneficial one. Thus, it is recommended that SB would be constructed in completely separated structure from water body of a reservoir with SAR ranged from 0.7 to $1.0\%.$

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.6
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• pp.49-60
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• 2020

The number of traffic control equipment installed to prevent traffic accidents increases every year due to continuous installation by the National Police Agency and local governments. However, it is installed based on qualitative judgment rather than engineering analysis results. The purpose of this study was to present additional installations in the future by presenting the installation criteria considering the severity of accidents for each road type and calculating the appropriate number of installations. ARI indicators that can indicate the severity of traffic accidents were developed, and road types were classified through analysis of variance and cluster analysis, and accident information by road type was analyzed to derive ARI of clusters with high traffic accident severity. The ARI values required to determine the installation of equipment for each road type were presented, and 5,244 additional installation points were analyzed.

• Journal of Korean Society of Transportation
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• v.34 no.3
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• pp.263-277
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• 2016

Traffic safety in freeway work zones is of keen interest since both crash frequency and severity are much higher than those in general freeway sections. The lane closure in work zones results in greater work load of drivers due to compulsory lane changes and speed reduction. Therefore, traffic merging control is an effective countermeasure for enhancing work zone safety. This study proposed an integrated framework based on driving and traffic simulations to evaluate traffic merging control methods in terms of traffic safety. In addition to the conventional merging method using the taper, joint merge and chicane-type merge were evaluated by the proposed methodology. Chicane-type merge outperformed other methods under level of service (LOS) A and B. On the other hand, it was identified that joint merge showed the best safety performance under LOS C traffic conditions.

• 한국벤처창업학회:학술대회논문집
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• 2017.11a
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• pp.171-174
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• 2017

오늘날 경제 성장의 발전은 현대인의 삶의 여유를 가져오게 되었으며, 그 중 뷰티산업의 발전은 국가 주력의 산업으로 발전하게 되었다. 이에 뷰티산업의 구성원인 여성의 사회진출의 기회가 증가 되었고, 이로 인해 여성들은 사회 적응을 위한 하나의 방법으로 외모적인 경쟁력을 가져야 했다. 외모에 대한 관심은 물론 매스미디어의 증가, 사회적, 문화적 분위기, 미용기술의 발달 등을 들 수 있다. 외모의 사전적의미로는 겉으로 나타나는 모습으로 외모관리를 위한 영역으로 피부 관리를 꼽을 수 있다. 피부 관리는 미에 관한 현대 여성의 관심의 증가로, 시간과 비용을 투자하여 외적으로 보여주는 관리로서 외모관리의 대표적 부분으로 중요시 되어오고 있다. 피부의 건강관리는 인식도 중요하고 실천도 중요하다. 그러나 인식과 실천의 관계를 구체적으로 연구한 논문은 부족한 실정이다. 특히 성인여성들을 대상으로 건강관리 인식과 실천을 연구하여 피부건강 관리에 대한 올바른 방안을 제시해준 논문이 필요하다고 생각하여 본 연구자는 이 논문을 설계하게 되었다. 본 연구의 조사대상은 서울지역에 거주하는 20세 이상 60세 미만의 신 성인여성을 대상으로 2017년 5월 02일부터 7월 30일까지 2달 동안 설문조사를 실시하였다. 모집단은 서울지역에 사는 성인 여성을 대상으로 총 400부의 설문지를 배포하였다. 그 중 응답이 불량한 사람 49부를 제외되고 351부가 최종 자료로 사용하였다. 연구 결과는 다음과 같다. 첫째, 조사대상자의 인구통계학적 특성을 알아본 결과, 연령은 '21-30세'가 85.2%로 가장 많았고, 결혼 상태는 '미혼'이 89.5%, 직업은 '학생' 67.0%, 최종학력은 '대학교 재학/졸업'이 68.1%, '가계의 월 소득은 '200만원 미만'이 71.8%로 가장 많이 소비되는 것으로 나타났다. 이상은 이혜원 (2009)의 논문과 같이 연령이 낮을수록 피부인식이 높아지며, 이들은 잠정고객으로서 피부 건강에 대한 비용을 높게 지불한다는 결과와 유사하다. 피부 관리실의 특성은 다음과 같다. 피부유형은 '복합성'이 47.6%, 적정 피부 관리 횟수는 '주 2회'가 32.5%, 적정 1회 피부 관리 비용으로는 '5만 원 이하'가 가장 많았으며, 피부 관리의 목적으로는 '여드름관리'가 32.8%, 피부 관리에서 중요하게 인식하는 부분으로는 '생활습관'이 79.8%로 대부분이었고, 피부의 유해요인으로는 '스트레스' 42.7%로 가장 높게 나타났다. 이상은 유유정(2013), 장은영(2013)와 같이 생활습관과 스트레스가 피부 관리에 영향을 준다는 결과와 유사하다.

• Journal of Korean Society of Environmental Engineers
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• v.32 no.11
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• pp.1030-1037
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• 2010

This study suggests the riparian area management measures that can control nonpoint source pollution and optimal carbon sequestration. 30~600 m ranges of riparian buffer width are estimated for controlling diffused pollutants in Nakbon K watershed in the Nakdong River. The area that can be easily restored to the riparian buffer zone considering current land use type is the 1,776.51 ha and it is the 50% of estimated buffer area. About 14,526 tC/yr, 11,826 tC/yr, 8,382 tC/yr and 3,349 tC/yr of carbon can be sequestered in the restoration of riparian buffer zone with broad leaved forest, mixed forest, coniferous forest and perennial grass, respectively. It is equivalent amount of carbon dioxide that emitted from 5,000 cars or 20,000 homes as a family of four.

• The Journal of the Korea Contents Association
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• v.15 no.2
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• pp.223-232
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• 2015

This research aims to suggest ways to improve the effectiveness of disciplinary suspensions of police officers. Research is based on reviews of prior research and related documents, in addition to analysis of the current status of disciplinary action through public information provided by the National Police Agency. The researcher examined cases in appeal commission example book and analyzed the types and reasons for such cases. This study offers three proposals for improving the disciplinary system. First, the discipline guidelines of police officers should be examined in relation to those of other government employees. Second, a comprehensive manual for data from the disciplinary process should be created and used institutionally. Lastly, police officers should establish an appeals commission that already exists within various civil service operations.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.26 no.2
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• pp.294-305
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• 2022

Recently, drones have been widely used to solve environmental problems such as environmental protection and natural disaster monitoring. This study focuses on the problem of the search altitude of drones when using drones to search for air pollution in order to maintain the urban air environment. In particular, when exploring air pollution in cities using drones, various experiments are conducted to determine the appropriate search altitude for each air pollution source and each communication module. Through the experiment, the maximum measurable altitude for the most common air pollutants, such as CO (carbon monoxide), NO₂ (nitrogen dioxide), O₃ (ozone), and P10, P2.5 (fine dust), was identified, and the effective search altitude for each air pollution source was determined. As a result of the experiment, three types of drone search altitudes including legally measurable altitudes were suggested. The communication module measurable altitude was 60m to 120m depending on the communication module, and the effective measurable altitude was analyzed from 10m to 100m.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.4D
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• pp.403-411
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• 2010

Nowadays, Light railway system is attracted public attention as solution for metropolitan traffic congestion. But it is difficult to decide an appropriate light railway system. It is especially hard in the Seoul metropolitan to decide an appropriate system, because there are many factors that must considered. So we research application status of light railway system that is scheduled or promoted in the Korea and the foreign nations. And we selected systems by types of city. In this paper, we divided into 6 types of city through factor analysis and cluster. And we considered various factor such as technology, transportation, environment etc that used previous research and feasibility study. To determine the priority among the factors, AHP(Analytic Hierarchy Process) was applied as a method for multi-standard decision method.

• Journal of the Korean Society of Radiology
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• v.9 no.6
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• pp.393-401
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• 2015

Radiation therapy for lung cancer is an effective treatment during monotherapy or combination therapy. Studies have reported that the optimum utilization rate of radiation therapy is estimated at 61% to 74%. Radiation therapy in Korea has been investigated to be low; further studies are needed. This study was intended to assess the appropriateness of the use of radiation and to reveal the use of radiation therapy-related factors by examining radiation therapy in lung cancer patients of Busan and South Gyeongnam Province. This study was aimed at the population diagnosed with lung cancer in Busan and South Gyeongnam Province. To conduct the study, 1036 patients enrolled in two hospitals were collected and 897 appropriate as subjects were selected. We compared the optimum utilization rate and actual rate of radiation therapy, and revealed the adequacy and related factors for use of radiotherapy. Of 897 patients, 503 (56%) were treated with medical therapy and 394 (44%) were given radiotherapy. The radiotherapy utilization rate of all lung cancer patients was 42%. The proportion of non-small cell lung cancer by histologic type was 33% and that of small cell lung cancer was 90%. Factors related to radiation therapy used in cancer were age, histological type, clinical stage, doctor refereed to, and clinical examination. Compared to radiation utilization by region (site), curative chest therapy was 42%; palliative treatment was 26%. In the comparison of histologic types, utilization of small-cell lung cancer is lower; the lowest especially in the stage III. Utilization of radiation therapy in Busan and South Gyeongnam Province was lower than the reasonable one. Utilization difference could be explained by patient factors, tumor factors, and health service factors. To improve utilization,development ofoutreach service programs and activation of the multidisciplinary team are required.