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Stabilization of Heavy Metal Contaminated Paddy Soils near Abandoned Mine with Steel Slag and CaO (제강슬래그와 CaO를 이용한 폐광산 주변 중금속 오염 농경지 토양의 안정화 처리 연구)

  • Son, Jung-Ho;Roh, Hoon;Lee, Sun-Young;Kim, Sung-Kyu;Kim, Gil-Hong;Park, Joong-Kyu;Yang, Jae-Kyu;Chang, Yoon-Young
    • Journal of Soil and Groundwater Environment
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    • v.14 no.6
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    • pp.78-86
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    • 2009
  • Applicability of CaO and steel slag as stabilizers in the treatment of field and paddy soils near Pungjeong mine contaminated with arsenic and cationic heavy metals was investigated from batch and column experiments. Immobilization of heavy metals was evaluated by TCLP dissolution test. Immobility of heavy metal ions was less than 15% when steel slag alone was used. This result suggests that $Fe_2O_3$ and $SiO_2$, known as the major component of steel slag, have little effect for the immobilization of heavy metal ions due to acidity of TCLP solution. Immobilization of cationic heavy metals was little affected by the ratio of CaO and steel slag while arsenic removal was increased as the ratio of steel slag to CaO increased. In the column test, concentrations of both arsenic and cationic heavy metals in effluents were below the water discharge guideline over the entire reaction period. This result can be explained by the immobilization of cationic heavy metals from the increased pH in soil solution as well as by the formation of insoluble $Ca_3(AsO_4)_2$. From this work, it is possible to suggest that arsenic and cationic heavy metals can be concurrently stabilized by application of both CaO and steel slag.

Assessment and Prediction of Stand Yield in Cryptomeria japonica Stands (삼나무 임분수확량 평가 및 예측)

  • Son, Yeong Mo;Kang, Jin Taek;Hwang, Jeong Sun;Park, Hyun;Lee, Kang Su
    • Journal of Korean Society of Forest Science
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    • v.104 no.3
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    • pp.421-426
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    • 2015
  • The objective of this paper is to look into the growth of Cryptomeria japonica stand in South Korea along with the evaluation on their yields, followed by their carbon stocks and removals. A total of 106 sample plots were selected from Jeonnam, Gyeongnam, and Jeju, where the groups of standard are grown. We only used 92 plots data except outlier. As part of the analysis, the Weibull diameter distribution was applied. In order to estimate the diameter distribution, the growth estimation equation for each of the growth factors including the height, the diameter at breast height, and the basal area was drafted out and the verification for each equation was examined. The site index for figuring out the forest productivity of Cryptomeria japonica stand for each district was also developed as a Schumacher model and 30yr was used as a reference age for the estimation of the site index. It was found that the site index for Cryptomeria japonica stand in South Korea ranges from 10 to 16 and this result was used as a standard for developing the stand yield table. According to the site 14 in the stand yield table, the mean annual increment (MAI) of the Cryptomeria japonica reaches $7.6m^3/ha$ on its 25yr and its growing stock is estimated to be at $190.1m^3/ha$. This volume is about $20m^3$ as high as that of the Chamaesyparis obtusa. Furthermore, the annual carbon absorptions for a Cryptomeria japonica stand reached the peak at 25yr, which is 2.14 tC/ha/yr, $7.83tCO_2/ha/yr$. When compared to the other conifers, this rate is slightly higher than that of a Chamaecyparis obtusa ($7.5tCO_2/ha/yr$) but lower than that of the Pinus koraiensis ($10.4tCO_2/ha/yr$) and Larix kaempferi ($11.2tCO_2/ha/yr$). With such research result as a base, it is necessary to come up with the ways to enhance the utilization of Cryptomeria japonica as timbers, besides making use of their growth data.

An Analysis for the Economic Impact of Forest Road Investment (임도시설 투자의 경제적 파급효과 분석)

  • Lee, Seung-Jung;Jung, Byung-Heon;Kim, Ki-Dong;Jeon, Hyon-Sun;Jo, Min-Woo
    • Journal of Korean Society of Forest Science
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    • v.106 no.2
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    • pp.219-229
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    • 2017
  • Forest road is an essential infrastructure for forest management such as the composition and management of forest resources, timber and forest byproduct production & transportation. It has recently been utilized forest recreation and forest sports as well as also forest pest control, forest fire prevention and evolution. When you build a forest road, the economic function in the forest is activated, so that it can result in the ripple effect of induced employment, value-added creation and production inducement. The purpose of this study is to analyze the impact caused by forest road construction occurring as the overall economy. For analysis it was applied to inter industry analysis method that is a method for analyzing the quantitative cross-correlation. The data were used in the Input-Output Tables In 2014, the Bank of Korea. When you build a forest road, economic effect due to the construction of the forest road is generated and economic effects are also generated due to the increase in the production of forest products after the construction of the forest road. Therefore, we will analyze the economic impact of the two effects. The estimated economic value of forest products, which is the economic effect of forest product cultivation, was calculated through some assumptions and the economic ripple effect was analyzed. The forest road construction sector is defined as land clearing and reclamation, and irrigation project construction and the forestry forest products sector is defined as the sum of raw timber, edible forest products and misc. forest products. In total, 32 sectors were classified, and except for the two sectors defined as forest road construction and forestry forest products, the remaining sectors were integrated according to the classification system of 30 integrated classifications of the Bank of Korea. As a result, the production inducement coefficient for forest construction was analyzed to be 2.767 and the production inducement coefficient for forestry forest products was analyzed to be 1.565. This means that 2,767 times the production of forest road construction investment is induced in the whole industry and the production of 1.562 times the amount of forestry forest products is caused by the whole industry as the production of forestry forest products increases. The value added inducement coefficient for forest road construction was 0.977 and the value added inducement coefficient for forestry forest products was 0.985. Forest road are essential infrastructure for forestry development and should be continuously invested because they are essential elements of timber production and forest byproduct production with functions such as forest management, forest recreation, forest sports, and town connection.

Biological treatment process for Food wastewater Using ER-1 bioreactor (다단 수직형 호기성반응기(ER-1)를 이용한 음식물 폐수의 생물학적 처리기술)

  • Lee, Jae-ki;Choi, Hong-Bok;Shin, Eung-Bai;Park, Ju-Hyoung;Choi, Eun-Ju;Kim, Jung-Rae;Park, Young-Sook
    • Journal of the Korea Organic Resources Recycling Association
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    • v.14 no.4
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    • pp.113-120
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    • 2006
  • Wastewater generated through the food waste recycling process have known high concentration, BOD 20,000~150,000 mg/L, which has to treat to the proper level because of a ban on reclamation. But it is impossible to treat less than 10 days by existing water treatment plant. Ecodays Ltd. is to treat this wastewater during 2~4 days by ER-1, which can simultaneously induce the modified PFR(Plug Flow Reactor) of the oxygen transfer rate, MLVSS concentration, and influent concentration to top from bottom of reactor. We tested the pilot test about low concentration food wastewater(BOD 16,500 mg/L) and high concentration food wastewater(64,431 mg/L) at the food waste recycling plant of H-Gun(20t/d). Hydraulic retention time(HRT) of ER-1 for low concentration food wastewater is 2.5day. In low concentration conditions, ER-1 treatment efficiency is to appear BOD 99%, COD 98%, TN 97%, and TP 96%. While ER-1 process for high concentration food wastewater treatment is composed 2 stages, which are to be HRT 2.5day for law wastewater and HRT 1.5 day for secondary treatment. In high concentration conditions, ER-1 treatment efficiency is to appear BOD 97%, COD 84%, TN 66%, and TP 95%. It is treated without temperature control about high temperature($50^{\circ}C$) to appear low treatment efficiency in high concentration conditions.

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Health Conditions and Health Behaviors of Merchants at Traditional Markets (전통시장 상인의 건강상태와 건강행태)

  • Hwang, Seong-Ho;Kwon, O-Hyun;Jeon, Mi-Soon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.18 no.10
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    • pp.237-245
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    • 2017
  • This cross-sectional descriptive study was conducted to determine the health conditions and health behaviors of merchants at traditional markets and compare them with members of the general population[ED highlight - do you mean "members of the general population"?]. The data were collected from 307 merchants at N traditional market in C City from 1-20 June 2015 at D Health Center of C City after physical measurement and blood collection and then analyzed using SPSS WIN 21.0. The male, female, and overall smoking rates of merchants at the traditional market were 34.2%, 3.5% and 11.1%, the annual drinking rates were 68.4%, 38.5%, and 45.9%, and the rates of subjects under stress and the rates of experiencing depression were 23.7%, 28.5%, and 27.4% and 5.3%, 6.1%, and 5.9%, respectively, which were all relatively lower than members of the general population[ED highlight - please ensure that my changes here are in keeping with your intended meaning.]. The male, female and overall rates of medium-level physical activities and walking were 32.9%, 19.9%, and 23.1% and 85.5%, 79.2%, and 80.8%, respectively, to have relatively good health behaviors, and the mental health is relatively fine than members of the general population[ED highlight - please clarify this, I cannot infer your intended meaning.]. However, test group[ED highlight - the test group? Please specify.] had high prevalence rates of hypertension, diabetes, hypercholesterolemia, and metabolic syndrome. Moreover, as the duration of work increased, the abdominal circumference as well as the prevalence rates of low HDL-cholesterol, hypertension, metabolic syndrome, and arthritis increased. Therefore, the specific causes of these shall be determined, and the long-term daily life improvement program shall be prepared and applied continuously for merchants at traditional markets.[ED highlight - please specify what these refer to; however, the entire sentence can probably be deleted.

Effect of Temperature on the Quality and Storability of Cherry Tomato during Commercial Handling Condition (유통중 온도관리가 방울토마토의 품질과 저장성에 미치는 영향)

  • Islam, Mohammad Zahirul;Kim, Young-Sik;Kang, Ho-Min
    • Journal of Bio-Environment Control
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    • v.21 no.2
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    • pp.88-94
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    • 2012
  • This study was carried out in order to investigate the effect of temperature of treatment and storage on the longevity of 'Unicorn' tomatoes of light red maturity stage during commercial handling conditions encountered while exporting over long distances. Tomato stored at $5^{\circ}C$ and $11^{\circ}C$ temperature with 85% relative humidity by pre-treating handling temperature that was using from field to before shipment as a winter temperature $5^{\circ}C$, spring temperature $11^{\circ}C$ and summer temperature $25^{\circ}C$ for 3 days. On the final storage day, $25^{\circ}C/11^{\circ}C$ (treated/stored) tomatoes showed the highest respiration and ethylene production rate; whereas the lowest respiration and ethylene production rate was found for $5^{\circ}C/5^{\circ}C$ treated and stored tomatoes. Tomatoes treated and stored at $5^{\circ}C/5^{\circ}C$ showed higher marketability, without evidence of fungal rot, decay or spots for 23 days. The fresh weight loss under all treatment conditions increased gradually during $5^{\circ}C$ and $11^{\circ}C$ storage temperatures. The higher firmness and soluble solids were determined from $5^{\circ}C/5^{\circ}C$ and $5^{\circ}C/11^{\circ}C$ treated and stored tomatoes repectively, than from others tomatoes on the final day of storage. In addition, $5^{\circ}C/5^{\circ}C$ tomatoes showed higher vitamin C contents than tomatoes stored at other temperatures, on the final day of storage. As the ripening and storage period progressed, the titratable acidity increased, but declined (P < 0.05) thereafter, due to over ripe tomatoes under all treatment conditions. These results show that $5^{\circ}C/5^{\circ}C$ treated and stored light red maturity stages of 'Unicorn' tomatoes are optimum to export because they show the highest storability and marketability. Moreover, the marketability of light red maturity stage of 'Unicorn' tomato maintained for 2 weeks in $25^{\circ}C/11^{\circ}C$ treated and stored temperature that might be the export temperature from Korea to Japan in summer season. This research result could be useful in helping tomato growers and exporters to get optimum market value by satisfying the buyer and consumer with a fresher product.

Heating Performance of Hot Water Supplying System in Greenhouse (온수배관을 이용한 온실의 난방성능)

  • Yoon, Yong-Cheol;Shin, Yik-Soo;Kim, Hyeon-Tae;Bae, Seoung-Beom;Choi, Jin-Sik;Suh, Won-Myung
    • Journal of Bio-Environment Control
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    • v.21 no.2
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    • pp.79-87
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    • 2012
  • This research was conducted to obtain basic data with regard to the heating performance that would be produced by installing an aluminum hot water pipe inside the greenhouse with the goal of reducing the heating energy in greenhouse. The research results are summarized as follows. The degree of difference in relation to the temperature by height within the greenhouse during the entire experiment was significant - within the range of 4.0~$7.0^{\circ}C$. The temperature difference between incoming and outgoing water was about $3.3^{\circ}C$ greater when FCU was activated compared to when it was not activated. Meanwhile, the amount of energy consumed increased about 36.2~40.1%. The amount of pyrexia per hour also increased by 44.6~52.0%. During the experiment period, circulated flux was within the range of 0.48~$0.49L{\cdot}s^{-1}$ while average fluid speed was 1.53~$1.56m{\cdot}s^{-1}$. The average temperature difference between incoming and outgoing water was 6.24~$11.50^{\circ}C$. The amount of heating value by each set temperature within the minimum outdoor temperature range of -14.0~$-0.6^{\circ}C$ was 135,930~307,150 kcal, and the range was within the 9,610~$19,630kcal{\cdot}h^{-1}$ per hour. This demonstrated that about 23~53% heating energy of the maximum heating load could be supplied. Total radiating value and amount of energy consumed were 2,548,306 kcal and 3,075.7 kWh, respectively. When heating takes place using oil, which is a fossil fuel, the total amount of light oil consumed was 281.6 L while the cost was 321,000 won. When the electricity cost for farms is applied, the total cost was about 110,730 won, which is about 33.5% of the cost required compared to oil consumption. The temperature at in the experiment area was about 8.3~$14.6^{\circ}C$ higher compared to that of the control area.

consumers' purchasing behavior of functional cosmetics and Inula based functional cosmetics merchandising research (국내 소비자의 기능성화장품 구매행태 및 선복화 활용 기능성화장품 상품화를 위한 연구)

  • Han, Do-Kyung;Lee, Hyun-Jun;Lee, Eun-Hee;Paik, Hyun-Dong;Shin, Dong-Kyoo;Park, Dae-Sub;Hwang, Hye-Seon;Hong, Wan-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.8
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    • pp.236-250
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    • 2016
  • This study was conducted to provide baseline data regarding functional cosmetics so that Inula. based cosmetics can increase its competitiveness in the market as well as to understand current trends to enable anticipation of demands for future product development. For this research, general consumers over the age of 20 residing in Seoul and the Gyeonggi district were surveyed. The results show consumers preferred serum-type products among various types of cosmetics, and that they purchased these once every 1-3 months. Consumers also preferred these products in less than 10-30ml capacity, and at costs of less than 30,000-50,000 KRW. For whitening, functional cosmetics consumers also preferred the serum type, in less than 30-50ml capacity and priced less than 30,000-50,000 KRW. Consumers preferred to purchase functional cosmetics in single units. The major purchasing location, with a high preference rate, was cosmetic stores, and the major sources of information, also with high preference rates, were 'experienced reviews from family, friends and acquaintances' and 'TV advertisements'. Respondents selected 'over 50,000 KRW' the most for all items when responding to 'Purchase Intent for Functional Cosmetics containing Inula', and responded that they were willing to pay 10%-30% more for functional cosmetics containing Inula compared to standard functional cosmetics. These results show that businesses in the cosmetics industry need to take consumer demand into account when developing new functional cosmetic products, as well as establish plans to create specialized spaces that provide better quality service and increase word of mouth effect through better utilization of various types of offline media, social media, and blogs. The study also shows a need for businesses to develop products fully utilizing the Inula flower, which has been shown to be effective as a natural skin whitener, wrinkle reducer and skin moisturizer, to appeal to the increasing number of customers interested in health and beauty.

Evaluation of Performance Based Design Method of Concrete Structures for Various Climate Changes (다양한 기후변화에 따른 콘크리트 구조물의 성능중심형 설계 평가)

  • Kim, Tae-Kyun;Shim, Hyun-Bo;Ahn, Tae-Song;Kim, Jang-Ho Jay
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.1 no.1
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    • pp.8-16
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    • 2013
  • Currently, global warming has advanced by the usage of fossil fuels such as coal and petroleum. and the atmosphere temperature in the world of 100 years(1906~2005) has been risen $0.74^{\circ}C{\pm}0.18^{\circ}C$, IPCC announced that the global warming effect of last decade was nearly doubled compared to the changes($0.07^{\circ}C{\pm}0.02^{\circ}C$/10year) in the past 100 years. Moreover, due to the global warming, heat wave, heavy snow, heavy rain, super typhoon, were caused and are increasing to happen in the world continuously causing damages and destruction of social infrastructures, where concrete structures are suffering deterioration by long-term extreme climate changes. to solve these problems, the new construction technology and codes are necessary. In this study, to solve these problems, experiments on a variety of cases considering the temperature and humidity, the main factors of climate factors, were performed, and the cases are decided by temperature and humidity. The specimens were tested in compressive strength test and split tensile test by the curing age(3,7,28 days) morever, performance based design(PBD) method was applied by using the satisfaction curve developed from the experiment date. PBD is the design method that gathers the current experimental analysis and past experimental analysis and develops the material properties required for the structure, and carries out the design of concrete mix, and it is recently studied actively worldwide. Also, it is the ultimate goal of PBD to design and perform on structures have sufficient performance during usage and to provide the problem solving for various situations, Also, it can achieve maximum effect in terms of functionality and economy.

The effect of enamel matrix derivative (EMD) in combination with deproteinized bovine bone material (DBBM) on the early wound healing of rabbit calvarial defects (법랑기질 단백질 유도체와 혼합된 이종골 이식재가 토끼 두개골 결손부 초기 치유에 미치는 영향)

  • Kim, You-Seok;Jang, Hyun-Seon;Park, Ju-Chol;Kim, Heoung-Jung;Lee, Jong-Woo;Kim, Chong-Kwan;Kim, Byung-Ock
    • Journal of Periodontal and Implant Science
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    • v.35 no.1
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    • pp.199-216
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    • 2005
  • 치주치료의 가장 중요한 목적은 상실된 치주조직의 형태적, 기능적 재건이다. 법랑기칠 단백질 유도체(enamel matrix derivative: EMD)는 치주 병소에 사용시 상피세포의 증식을 억제하며 치주인대 및 백악아세포를 활성화시켜 무세포성 백악질 및 치주인대와 골조직의 생성을 유도한다고 보고되고 있다. 또한 법랑기질 단백칠 유도체는 골모세포의 증식 및 분화를 촉진시키며 alkaline phosphatase의 활성 및 mineralized nodule의 형성을 촉진시킨다고 보고되고 있다. 이에 본 연구에서는 토끼 두개골 결손부에 법랑기질 단백질 유도체와 이종골 이식재를 이식한 후 골밀도를 방사선학적으로 분석하고, 신생골 형성 및 주변 조직 반응을 조직학적으로 관찰, 평가하고자 하였다. 토끼 두개골에 6mm trephine bur(외경 8mm)를 이용하여 경뇌막에 손상을 주지 않도록 하면서 4개의 결손부를 형성하였다. 아무것도 이식하지 않은 군을 음성 대조군으로, 이종골 이식재 ($Bio-Oss^{(R)}$, Geistlich, Wolhusen, Switzerland)을 이식한 군을 양성 대조군으로 설정하였다. 법랑기질 단백질 유도체 ($Emdogain^{(R)}$, Biora, Inc., Sweden)만 이식한 군과 법랑기질 단백질 유도체와 이종골 이식재를 혼합하여 이식한 군을 설험군으로 설정하였다. 각각의 재료를 이식한 후 비흡수성 차폐막 ($Tefgen^{(R)}$, Lifecore Biomedical, Inc., U.S.A.)을 위치시키고 흡수성 봉합사로 일차봉합을 시행하였다. 각 군당 술 후 1, 2, 4주의 치유기간을 설정하였다. 동물을 희생시킨 후 두개골을 절제하여 먼저 방사선학적인 골밀도측정을 시행한 후 10% formalin에 고정한 후 통법에 따라 조직표본을 제작하여 광학현미경으로 관찰하였다. 1. 방사선학적인 평가에서 1, 2, 4주에 대조군과 법랑기질 단백질 유도체만 이식한 군과 비교해 이종골 이식재만 이식한 군과 이종골 이식재에 법랑기질 단백질 유도체를 이식한 군에서 더 큰 골의 밀도를 보이고 있었다 (P<0.01). 하지만, 동일한 시기에 대조군과 법랑기질 단백질 유도체만 이식한 군과의 차이는 발견할 수 없었으며 (P>0.05), 이종골 이식재만 이식한 군과 이종골 이식재에 법랑기질 단백질 유도체를 이식한 군의 차이 또한 발견할 수 없었다 (P>0.05). 2. 조직학적인 평가에서 1, 2, 4주에 대조군과 법랑기질 단백질 유도체만 이식한 군과 비교해 이종골 이식재만 이식한 군과 이종골 이식재에 법랑기질 단백질 유도체를 이식한군에서 골의 형성이 더 진행됨을 알 수 있었다. 법랑기질 단백질 유도체만 이식한 군이 대조군보다 2주에서 더 많은 신생골을 볼 수 있었으며, 이종골 이식재에 법랑기질 단백질 유도체를 이식한 군이 이종골 이식재만 이식한 군보다 1, 2주에서 더 많은 신생골을 관찰할 수 있었다. 이상의 결과에서 법랑기질 단백질 유도체는 토끼 두개골 결손부 치유단계에서 초기 골 형성을 촉진하는 것으로 사료되며 골 이식시에 법랑기질 단백질 유도체를 적용하는 것은 유용한 술식으로 사료된다.