• Title/Summary/Keyword: recession rate

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Geomorphological Processes of Jaein Waterfall and Dissection Valley in Hantangang Lava Plateau, Central Korea (한탄강 용암대지의 재인폭포와 개석곡의 지형 형성)

  • Lee, Min-Boo;Lee, Gwang-Ryul
    • Journal of The Geomorphological Association of Korea
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    • v.24 no.3
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    • pp.47-59
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    • 2017
  • This study aims to analyze geomorphologically Jaein Falls in Hantangang Lava Plateau for the landform structure, landform classification, falls dissection and recession. The height and recession length of the Falls are approximately 18m and 340m. after dissection valley arrive at area of the Jijangbong Volcanic Rock Complex of Mesozoic era, the fall will disappear. The structure of the dissection valley shows totally well vertical columnar joint near falls and plunge pool, colluvial talus deposits toward lower reach by the freezing-thawing and wet-dry activities, and alluvial cone and delta in estuary to Hantangang River. The Falls' age date and recession rate in the valley maybe relate to the age of the lava plateau. The estimated recession rate of the fall should be 8.75m/ka to 2.3m/ka, depending on the age 500ka to 40ka in lava plateau.

Trends Analysis of Suicidal Poisoning in Korea- Comparison before and after the IMF Crisis and the Economic Recession (IMF와 경기침체 전후 음독자살 환자에 대한 분석 -1997년부터 2004년까지 일개 대학병원 응급센터 연구조사를 중심으로-)

  • Lee Won Jae;Park Kyu Nam;Choi Seung Pil;Lee Mi Jin
    • Journal of The Korean Society of Clinical Toxicology
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    • v.3 no.1
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    • pp.33-39
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    • 2005
  • Purpose: Nowadays the Korean society is in the center of time of the social change. Because of dissociation of traditional family, IMF (International Monetary Fund) crisis and economic recession, the mortality rate of suicidal attempts are increasing annually. The majority of suicidal attempts were by poisoning considering the characteristics of korean society. Therefore we studied to find out the characteristics of suicidal poisoning before and after social economic stress, and to suggest the direction for the proper management. Methods: We reviewed medical records of 547 patients of suicide by poisoning who visited the emergency medical centers of St. Mary's hospitals from 1997 to 2004. For the annual trends analysis, we analyzed the demographic and toxicologic data of these patients compared with before and after IMF crisis (1998) and the economic recession ($2003\~2004$). Results: At the time of IMF and the economic recession, the number of suicidal poisoning increased, especially in fifth decade. The refusal rate of toxicological emergency treatment increased. Also the mortality rate and the admission rate to ICU (Intensive Care Unit) increased during the same period. In the result of the comparison analysis, clinical severity and mortality of social problem group were higher. However they couldn't be treated appropriately because of financial problem and the family indifference. Conclusion: At the economic recession period, the severity of suicidal poisoned patients was high. But the refusal rate of toxicologic treatment also increased, so the patients had lost the chance for proper toxicologic treatment. Therefore they would be supported by medical institution and public health.

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A Comparison of Clinical Effect for Root Coverage (치근피개술의 임상적 효과 비교)

  • Han, Jong-Soo;Hong, Ki-Seok;Chung, Chin-Hyung;Lim, Sung-Bin
    • Journal of Periodontal and Implant Science
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    • v.38 no.3
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    • pp.483-492
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    • 2008
  • Purpose: The purpose of this study was to compare clinical effect of the Langer & Langer technique, the modified Langer & Langer technique and Bruno technique. Material and Methods: 30 patients who have gingiva recession(Miller class I or class II) were carried root coverage. Langer & Langer technique(14 patients/32 tooth), modified Langer & Langer technique(5 patients/10 tooth) and Bruno technique(11 patients/18 tooth) was carried. At baseline and average 3 months after operation, it was estimated clinical index(Pocket depth, gingiva recession, clinical attachment level, keratinized gingiva, scar tissue, root coverage rate) by Williams style probe. Result: Root coverage rate is indicated Langer & Langer technique(8S%), Modified Langer & Langer technique(86%) and Bruno technique(90%). Conclusion: All three of the procedures were effective in gingival recession and improved clinical parameters.

Quantitative Analysis for Surface Recession of Ablative Materials Using High-speed Camera and 3D Profilometer (초고속 카메라와 삼차원 표면 측정기를 이용한 삭마 재료의 정량적 표면 침식 분석)

  • Choi, Hwa Yeong;Roh, Kyung Uk;Cheon, Jae Hee;Shin, Eui Sup
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.46 no.9
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    • pp.735-741
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    • 2018
  • In this paper, the surface recession of ablative materials was quantitatively analyzed using a high-speed camera and a three-dimensional profilometer. The ablation tests of the graphite and carbon/phenolic composite samples were performed using a 0.4 MW arc-heated wind tunnel for simulating the atmospheric re-entry environment. The real-time images during the ablation test were captured by the high-speed camera, and analyzed to calculate the surface recession and recession rate. Also, the surface data of samples were obtained using a three-dimensional profilometer, and the surface recession was precisely calculated from the difference of height between the surface data before and after the test. It is effective to complement the two measurement results in the comprehensive analysis of surface recession phenomena.

Investigating the Time Lag Effect between Economic Recession and Suicide Rates in Agriculture, Fisheries, and Forestry Workers in Korea

  • Yoon, Jin-Ha;Junger, Washington;Kim, Boo-Wook;Kim, Young-Joo;Koh, Sang-Baek
    • Safety and Health at Work
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    • v.3 no.4
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    • pp.294-297
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    • 2012
  • Previous studies on the vast increase in suicide mortality in Southeast Asia have indicated that suicide rates increase in parallel with a rise in unemployment or during periods of economic recession. This paper examines the effects of economic recession on suicidal rates amongst agriculture, fisheries, and forestry workers in Korea. Monthly time-series gross domestic product (GDP) data were linked with suicidal rates gathered from the cause of death records between1993-2008. Data were analyzed using generalized additive models to analyze trends, while a polynomial lag model was used to assess the unconstrained time lag effects of changes in GDP on suicidal rate. We found that there were significant inverse correlations between changes in GDP and suicide for a time lag of one to four months after the occurrence of economic event. Furthermore, it was evident that the overall relative risks of suicide were high enough to bring about social concern.

Comparative evaluation of the effects of oil pulling on periodontal indices - Using generalized estimating equation model (오일 풀링 중재에 따른 치주질환 임상 지표 비교 -일반화추정 방정식 모형의 적용)

  • Kim, Yun-Jeong;Yang, Jin-Ju;Lee, Mi-Ra;Kim, Mi-Hye;Youn, Geum-Chae;Lee, Ga-Yeon
    • Journal of Korean society of Dental Hygiene
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    • v.20 no.6
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    • pp.973-980
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    • 2020
  • Objectives: This study was to analyz the effects of comparative evaluation of the effects of oil pulling on periodontal indices. Methods: A total subjects were 38; control group (19 subjects) and experimental group (19 subjects). In the experimental group, coconut oil was provided and rinsed the mouth for about 10 minutes once a day. We evaluated possession rate of pocket depth (≥4 mm), possession rate of bleeding on exploring and possession rate of gingival recession (≥1 mm). Results: The possession rate of pocket depth (≥4 mm), bleeding on exploring and gingival recession (≥1 mm) significant difference in interaction between the group and measurement time. Conclusions: The findings of this study indicate that dental hygiene process and oil pulling specialists in care of periodontal diseases were effective mediation.

Evaluation of the Availability of Implant placement using Ridge Expansion Osteotomy (REO) (치조능확장골절단술을 이용한 임프란트 식립술의 유용성 평가)

  • Kim, Yeong-Gyun;Yun, Pil-Yeong;Kim, Beom-Su
    • The Journal of the Korean dental association
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    • v.46 no.4
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    • pp.243-247
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    • 2008
  • Purpose : Ridge expansion osteotomy (REO) has been introduced when it is necessary to expand narrow crestal ridge with simultaneous implant placement. This study has designed to evaluate the clinical availability of REO. Materials and methods : Subject were patients who had visited Seoul National University Bundang Hospital from July. 2003 to December, 2005 for implant placement using REO by one surgeon. Intraoperative and postoperative complication, failure of initial osseointegration and marginal bone resorption were estimated using electronic medical record and periapical radiography. Twenty?three patients, 8 males and 15 females, mean age 51, ranged 18 to 72, were treated for mean 26 months, ranged from 16 months to 46 months. Results : Mean diameter and length of implants placed at upper anterior, were 3.72mm and 13.32mm each other. Guided bone regeneration and ridge splitting were accompanied in this study. Five cases of cortical bone fracture, three cases of crestal bone loss more than 2mm, 2cases of gingival recession, and 2 cases of infection were noted, but there were no implants removed because of disintegration. Success rate of implant was 91.7%, even if survival rate of implant was 100%. In addition, there were no statistical significance between the success rate of REO and bone graft(p>0.05). Conclusion : Based on the results of the present study, it can be concluded that REO technique is reliable for implant placement at atrophic ridge with adequate height compared to bone graft and other osteotomies for ridge expansion, but care should be taken of esthetic problem such as gingival recession because of crestal bone resorption from trauma by osteotome.

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An Analysis on Japanese Recession Between 1993 and 2002 (1993~2002년 일본불황에 대한 연구)

  • Yoon, Hyung-Mo
    • International Area Studies Review
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    • v.13 no.2
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    • pp.168-188
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    • 2009
  • Japanese economy suffered from a great recession for one decade between 1993 and 2002, because of the bubble bursting. Recently, a similar situation broke out in the USA and spread throughout the world. This paper investigated the effects of economic policy on the Japanese depression in order to find out how the recession, caused by financial crisis, can be reasonably removed. The analysis of documentary records indicate that there exists an optimum rate in government debt and the point in time of economic policy is decisive. Statistical studies with a VAR model and a State Space Model suggest that government expenditures affect the growth rate of national product but with a short term and it has a time lag of a half year. Income tax has a grievous negative effect on the growth rate with a long term and it works without a time lag. Therefore the increasing of taxation should be put into force very carefully. However private investment is a determinate factor for the recovery of depression.

Geomorphological Processes and Changes of Waterfalls formed by Channel Avulsion (하도 변위에 의한 폭포의 형성과 변화)

  • Lee, Gwang-Ryul
    • Journal of the Korean Geographical Society
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    • v.48 no.5
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    • pp.615-628
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    • 2013
  • The waterfall can be formed by difference between the height of up and down part in new channel, is formed by channel avulsion that rapidly changing of river channel course. This study described types and processes of waterfalls by channel avulsion, and analyzed rates and factors of waterfall recession, on object to 7 waterfalls in South Korea. Bulyeong falls at Uljin-gun, Yongchu falls at Yeongdeok-gun, Jikyeon falls at Yanggu-gun and Gwangpum falls at Uljin-gun are formed by natural incised meander cutoff. Samhyeongje falls at Taebaek-si and Guryong falls are formed by river capture processes, and Palbong falls at Chungju-si is formed by artificial channel cutting for farm land secured. The locations of waterfalls gradually moved to upstream over time by head erosion. The recession rates were measured by 3~4m/ka on Bulyeong falls, Yongchu falls, Jikyeon falls and Samhyeongje falls, to estimate of formation age. Recession rates of these 4 waterfalls were analyzed that have clearly positive correlations with drainage area, precipitation, corrosion and weathering capability of bedrock, and initial height of waterfall.

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MEASUREMENT OF COASTAL EROSION ON THE EAST SEA USING CORONA SATELLITE IMAGERY

  • Park, Hee-Dae;Kim, Jong-Hong;Heo, Joon
    • Proceedings of the KSRS Conference
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    • v.2
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    • pp.760-763
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    • 2006
  • In this paper, a small portion of coastline on the EAST SEA was studied using CORONA panoramic satellite photo and 1:5000 Korean National Topographic Map. The project site near Kangneung city was 3 Km shoreline on the Kangmoon Beach and the SongJeong Beach, which have suffered from severe erosion. The first and the most important step was to rectify a CORONA image over the project site. A rigid mathematical model and a heuristic polynomial transformation were used for the purpose. The rectified image was overlaid with 1:5000 Korean National Topographic Map produced by aerial mapping. Among numerous methods for shoreline erosion measurement, area-based approach was chosen and used for the computation for annual shoreline recession. The final result of the analysis was that the average recession in the period of 1963-1998 was 33.6m and the annual rate was 0.96m.

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