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Studies on the Pollution of Heavy Metals in the Soils of Seoul Area (서울시 일원의 토양 중금속오염도 조사)

  • Kim Hong Je;Kim Youn Cheon;Lee Kwang Kuk;Park Sang Hyun
    • Journal of environmental and Sanitary engineering
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    • v.3 no.2 s.5
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    • pp.91-98
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    • 1988
  • This study was carried out to investigate the Pollution of heavy metals in Soil, collected from the 50 sampling sites in 1986. The results were as follows; 1. In the average contents of Cd, the highest value was 0.33mg/kg in the Industrial area, the lowest value was 0.06 mg/kg in the Greenbelt and 0.10-0.22mg/kg in the other areas. 2. In the average contents of Cu, the highest value was 33.46mg/kg in the Industrial area, the lawest value was 3.79mg/kg in the Greenbelt and 4.69-12.21mg/kg in the other areas. 3. In the average contents of As, the highest value was 1.80mg kg in the Residential area, the lowest value was 0.43mg/kg in the Greenbelt and 0.64-1.65mg/kg in the other areas. 4. In the average contents of Zn, the highest value was 29.84mg/kg in the out wall of Seoul, the lowest value was 17.32mg/kg in the Greenbelt and 19.62-26.71mg/kg in the other areas. 5. In the average contents of Pb, the highest value was 17.09mg/kg in the Industrial area, the lowest value was 5.21mg/kg in the Reclamated waste and 5.67 -14.10mg/kg in the other areas. 6. Distribution of Heavy metals was Zn>Cu>Pb>As>Cd and the relations of Zn-Cd, Pb-Cd, Pb-Cu, Pb-Zn were shown the correlation significantly (P< 0.01).

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Development of the Contents of the Guideline for Dietitians' Knowledge, Attitudes and Practices (KAP) for Sustainable Management at School Foodservice (지속가능경영을 위한 학교급식 영양사의 지식, 태도, 실천 가이드라인 콘텐츠 개발)

  • Yi, Na-Young
    • Journal of the Korean Society of Food Culture
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    • v.32 no.6
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    • pp.513-526
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    • 2017
  • The purpose of this study is to identify the guideline's contents for dietitians' knowledge, attitudes, and practices (KAP) for the sustainability management at school foodservice. The contents for the guideline were determined by the Delphi technique of two rounds. The Delphi panels of experts were consisted of sixteen school dietitians and fourteen professors of food and nutrition with more than 10 years of experiences by convenience sampling method. Based on the literature, knowledge, attitudes, and practices required for dieticians were classified into menu management, procurement, food production, facility and energy management, waste management, personnel management, and nutrition education. Data were analyzed using SPSS for Windows version 24 and EXCEL to calculate descriptive statistics, content validity ratio, degree of agreement, and degree of convergence. As a result of the second round, the validity scores of 'knows eco-friendly certification standards and labeling systems (4.53 point)' in the knowledge category, and 'tries to purchase local agricultural products (4.87 point)' in the attitude category were the highest. From that round in the practice category, the validity scores of 'plan menus for students' health', 'purchases eco-friendly food', and 'conserves energy in pre-processing and cooking process' were the highest with 4.73 point. Applying the criteria for securing the validity of the contents, the contents of 25 knowledge items, 20 attitude items and 30 practice items were confirmed. The findings of the study can be used to develop the guideline for dietitians required for the sustainability management.

Chemical Composition and Fermentation Characteristics of the Corn Silage During Feedout at Yonchon of Gyeonggi-do (연천지역에 있어서 옥수수 사일리지의 개봉 후 경과기간에 따른 시료성분 및 발효품질)

  • Sung Kyung Il;Kim Gon Sik;Lee June Woo;Kim Byung Wan;Kim Sang Rok
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.25 no.1
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    • pp.43-50
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    • 2005
  • The purpose of this study is to discuss the ways to consistently feed high quality corn silage(CS). This study evaluated the effect of the corn silage, after a certain time has elapsed, on the chemical composition and fermentation characteristics after feedout during the winter feeding period of the CS. Six samples of CS from four dairy farms(E1, E2, E3, and L1 ) were taken in order to feed the milking cows over a winter feeding Period from November of 2002 until February of the following year, 2003(six samples were taken at the fellowing dates in the following order: sample one was taken on the 23rd Nov. 2002, sample two on the 5th of Dec. 2002, 3rd sample on the 23rd of Dec. 2002, 4th sample on the 7th of Jan. 2003, 5th sample on the 22nd of Jan. 2003, and the 6th sampling was carried out on the 6th of Feb. 2003) at the three sampling sites after the opening of the trench silos at intervals of 15 days. In the dry matter contents of CS, there wasn't any specific tendency according to the elapsed time in the range of 21.3~$27.3\%$ at all low dairy farm(E1, E2, E3, and L1). And the average dry matter contents were 24.1, 25.9, 23.6, and $20.4\%$. Considering the Proper amount of the dry matter of CS during the ripen yellow stage, the appropriate moisture content was $33\%$ (NRC, 1989), and these dry matter contents were all low. A consistent tendency was not found in the contents of CS. The average of CP contents were 10.2, 8.0, 8.5, and $9.8\%$ at the E1, E2, E3, and L1 farms, and there were significant differences. The TDN contents of CS were not different among forms according to the time elapsed. The pH, according to the time elapsed after opening of the CS, there were no differences at each of E1, E2, E3, md L1 farms. Average pH were 3.5, 3.9, 3.6, and 4.1, md all of them were in normal range. In the lactic acid contents of CS, a consistent tendency was not found among four farms. But according to the time elapsed. there was a goat difference from 1.13~$7.8\%$ The acetate, propionate, and butyrate contents of CS were very low. In this study, there was no significant difference in the CS's chemical composition and fermentation characteristics according to the elapsed time at all four dairy farms. Considering the proper dry matter contents of CS during the ripen yellow stage, the appropriate dry matter content was $33\%$, and dry matter contents of few farms were all low. To enhance the quality of corn silage should be ensiled com at proper dry matter content range from 28 to $35\%$ Therefore, content of the corn plant should be always be closely monitored prior to beginning harvest.

Audio Quality Enhancement at a Low-bit Rate Perceptual Audio Coding (저비트율로 압축된 오디오의 음질 개선 방법)

  • 서정일;서진수;홍진우;강경옥
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.6
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    • pp.566-575
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    • 2002
  • Low-titrate audio coding enables a number of Internet and mobile multimedia streaming service more efficiently. For the help of next-generation mobile telephone technologies and digital audio/video compression algorithm, we can enjoy the real-time multimedia contents on our mobile devices (cellular phone, PDA notebook, etc). But the limited available bandwidth of mobile communication network prohibits transmitting high-qualify AV contents. In addition, most bandwidth is assigned to transmit video contents. In this paper, we design a novel and simple method for reproducing high frequency components. The spectrum of high frequency components, which are lost by down-sampling, are modeled by the energy rate with low frequency band in Bark scale, and these values are multiplexed with conventional coded bitstream. At the decoder side, the high frequency components are reconstructed by duplicating with low frequency band spectrum at a rate of decoded energy rates. As a result of segmental SNR and MOS test, we convinced that our proposed method enhances the subjective sound quality only 10%∼20% additional bits. In addition, this proposed method can apply all kinds of frequency domain audio compression algorithms, such as MPEG-1/2, AAC, AC-3, and etc.

A Study on Characteristics of Core Projects Described in 3rd Community Health Plans (제3기 지역보건의료계획서에 기술된 핵심사업의 특성에 관한 연구)

  • Kim, Dong-Moon;Lee, Weon-Young;Moon, Ok-Ryun;Kim, Chang-Yup
    • Journal of Preventive Medicine and Public Health
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    • v.37 no.1
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    • pp.88-98
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    • 2004
  • Objectives : The 3rd community health plan let health centers select and promote core projects considering budget and manpower. This study analyzed the content and selection processes of core projects, using the nationwide 3rd community health plans, to give relevant information on health center policies. Methods : Classification criteria for content analysis of core projects were established and verified through a literature review and by specialist discussions. Fifty plans were selected by stratified proportional random sampling for regional characteristics. And coding criteria standardized through coding repetition and discussion, by 2 persons (k>0.7). Using stratified proportional random sampling for 16 cities and provinces, regional characteristics, 117 plans were selected, and the contents of the core project selection processes and program contents analyzed. Results : The survey was used by 59.8 % of samples as a core project decision-making method. The partici- pants included 98.6, 81.4, 40 and 38.6% of the health staffs, residents, medical institutions, and administrators, respectively. Discussion was used by 15.4% of samples. The participants were health staffs by 100% as a great. The ranking of the frequencies of the selected core projects were, in order; chronic disease control, health promotion, elderly health, maternal-child health, and oral health at 16.4, 14.8, 14.3, 12.7 and 11.9%, respectively. Analyses on the chronic disease control and elderly health contents showed the diversity of object disease, high rates of visitors on patient detection programs, high rates of unclear target populations, and the provision of medical exams and treatments as the main services, with high variations in business per-formance. The national health budgets for health centers in 2003 were about 910 and 240 million won for chronic disease control and elderly health, respectively, which were less than for the other five priority core projects. Conclusions : The chronic disease control and elderly health at the health centers were not standardized for object disease, patient detection program, target population, service provision, and national support budget was insufficient. Thus it is necessary to develop standard guidelines, and increase financial support, for chronic disease control and elderly health

Analysis of Quartz Contents by XRD and FTIR in Respirable Dust from Various Manufacturing Industries Part 2 - Ceramics, Stone, Concrete, Glass and Briquets, etc. (제조업체에서 발생하는 호흡성분진중 XRD와 FTIR를 이용한 결정형유리규산 농도의 분석 제2부 : 요업, 석재, 콘크리트, 유리, 연탄 및 기타사업장)

  • Kim, Hyunwook;Phee, Young Gyu;Roh, Young Man;Won, Jeoung Il
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.9 no.1
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    • pp.99-111
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    • 1999
  • The purpose of this study was to evaluate crystalline silica contents in airborne respirable dusts from various manufacturing industries and to compare analytical ability of two different methods of quantifying crystalline silica, X-ray diffraction(XRD) and Fourie transform infrared spectroscopy(FTIR). Various manufacturing industries with a history of having pneumoconiosis cases and also known to generate dusts containing crystalline silica were investigated. These industries include: ceramics, brick, concrete, and abrasive material etc. The personal respirable dust samples were collected using l0mm, Dorr-Oliver nylon cyclone equipped with 37mm, $5{\mu}m$ pore size. polyvinylchloride (PVC) filters as collection media. All samples were weighed before and after sampling and were pretreated according to the NIOSH sampling and analytical methods 7500, and 7602 for dust collection and quartz analysis. A total of 48 samples were collected from these industries. Initial analyses of these samples showed log-normal distributions for dust and quartz concentrations. Some results from ceramics and stone exceeded current Korean Occupational Exposure Limits. The average concentrations of personal respirable dust by cyclone were 0.43, 0.24, 0.26, 0.42, 0.53 and $0.29mg/m^3$ in ceramics, stone, concrete, glass, briquets, and others, respectively. A comparison of performance of two analytical methods for quantifying crystalline silica was performed using data from ceramics. The results showed that no significant difference was found between two methods for ceramics. The mean crystalline silica contents determined by XRD were 3.41 % of samples from briquets and 7.18 % from ceramics and were 2.58 % from concrete and 10.33 % from ceramics by FTIR. For crystalline silica analysis, two analytical techniques were highly correlated with $r^2=0.81$ from ceramics. Both cristobalite and tridymite were not detected by XRD and FTIR.

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Comparison of Airborne Asbestos Concentrations from Soils in Naturally Occurring Asbestos(NOA) Areas - Activity Based Sampling(ABS) vs. Real-time Asbestos Fiber Monitor(F-1 fiber monitor) - (자연발생석면지역의 토양 내 석면함유율에 따른 비산석면 농도평가 - 활동근거시료채취방법(ABS)과 실시간 섬유 측정 장치(F-1 fiber monitor) 결과 비교 -)

  • Jang, Kwangmyung;Park, Kyunghoon;Choi, Sungwon;Kim, Hyunwook
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.27 no.3
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    • pp.245-256
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    • 2017
  • Objectives: The present study is aimed at performing real-time measurement of fibrous materials using an F-1 fiber monitor, investigating the correlations between the measurements and environmental conditions, and assessing the feasibility of the use of the monitor in actual exposure assessments based on the accuracy and reliability of the device. Methods: Asbestos specimens with a fixed asbestos content were dispersed in a chamber and collected with a particle measuring test device. Measurements obtained by the existing PCM method, and with the F-1 fiber monitor were compared. In addition, concentrations of asbestos fibers obtained by the PCM method, the TEM method, and the F-1 fiber monitor were compared with that of specific ABS scenarios in NOA regions. Correlations of asbestos contents in soil and weather conditions with each method of measurement were analyzed. Results: Laboratory results showed that levels of asbestos fibers measured with each method increased as fiber contents in soil increased. In the accuracy and reproducibility assessment, no significant differences were found between the different methods of measurement. On-site assessment results showed positive correlations among the methods, and these correlations were less significant compared with what was shown by the laboratory results. Levels of asbestos fibers increased as asbestos contents in soil increased, and as temperature increased. Levels of asbestos fibers decreased as humidity increased, and wind speed did not significantly affect the extent to which asbestos fibers were scattered. Conclusions: While it would be premature to replace existing methods with the use of F-1 fiber monitors in real sites based on the results of this study, the monitor may be useful in the screening of the sites, which assesses hazard levels in different regions. Replacement of existing methods with the use of F-1 fiber monitors may be possible after the limitations identified in this study are overcome, and additional assessment data are obtained and reviewed under different conditions to confirm the reliability of the monitor in future research. Obtained assessment results may be used as basic data for the assessment of asbestos hazard in NOA regions.

The Effective Recovery of Gold from the Invisible Gold Concentrate Using Microwave-nitric Acid Leaching Method (마이크로웨이브-질산침출방법에 의한 비가시성 금의 회수율 향상)

  • Lee, Jong-Ju;Myung, Eun-Ji;Park, Cheon-Young
    • Journal of the Mineralogical Society of Korea
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    • v.32 no.3
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    • pp.185-200
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    • 2019
  • This study aimed to liberate gold from invisible gold concentrate (Au = 1,840.00 g/t) through microwave nitric acid leaching experiments. For the purpose, this study conducted microwave-nitric acid leaching experiments and examined nitric acid concentration effect, microwave leaching time effect and sample addition effect. The results of the experiments were as follows: Au (gold) contents were not detected in all of the microwave leaching conditions. In the insoluble-residue, weight loss rate tended to decrease as the nitric acid concentration, microwave leaching time and sample addition increased. In an XRD analysis with solid-residue, it was suggested that gypsum and anglesite were formed due to dissolution of calcite and galena by nitric acid solution. When a fire assay was carried out with insoluble-residue, it was discovered that gold contents of the solid-residue were 1.3 (Au = 2,464.70 g/t) and 28.8 (52,952.80 g/t) times more than those of concentrate. But in the gold contents recovered, a severe gold nugget effect appeared. It is expected that the gold nugget effect will decrease if a sampling method of concentrate is improved in the microwave-nitric acid leaching experiments and filtering paper with smaller pore size is used for leaching solution and burned filter paper is used for sampling in lead-fire assay.

Chemical Constituent Variabilities of the Green Tea Leaves by Harvest Periods (채취시기별 녹차 생잎(生葉)의 성분 변화)

  • Jo, Jong-Soo;Kim, Jong-Cheol;Cho, Kyung-Hwan;Kim, Ru-Mi;Han, Jae-Yoon
    • Journal of the Korean Wood Science and Technology
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    • v.39 no.4
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    • pp.370-380
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    • 2011
  • This study was carried out to investigate the properties of soils in the sampling green tea farms and the chemical constituents of the green tea leaves at the 3 harvest stages (Ujeon ${\rightarrow}$ Sejag ${\rightarrow}$ Jungjag). The results as follows; The properties of the soils were sandy loam, loam, well drained and fertile-rich in phosphoric acids in general. The contents of chlorophyll, tannin, vitamin-c and total catechin were increased as harvest periods getting late but the contents of total nitrogen, free amino acids, theanine, caffeine were decreased on the reverse. The inorganic constituents Mg, Ca and Mn were increased as harvest periods getting late but the Na, K, B contents were decreased on the reverse. The contents of the total nitrogen, chlorophyll, total free amino acid, theanine, caffeine and total catechin and Na, Mg, Ca, B and Se were insignificant differences between Ujeon and Sejag.

The actual condition of oral health education in children education institute teacher (유아교육기관 교사들의 구강보건교육 실태에 관한 연구)

  • Park, Chung-Soon;Park, Ji-Young;Lee, Seon-Ok
    • Journal of Korean society of Dental Hygiene
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    • v.13 no.6
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    • pp.1031-1039
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    • 2013
  • Objectives : The purpose of this study is to improve the oral health knowledge in children education institute teacher. Methods : Data were selected by convenience sampling method. A self-administered questionnaire was filled out by the children education institute teachers. Frequency analysis and $x^2$ test were used to analyze the actual condition of oral health education and utilizing media contents. Pearson's Results : 1. The teachers received the oral health education (94.3%) twice to five times. 2. There was a difference between position and career of teacher in implementing oral health education. 3. Most of the oral health education were done by the dentists. Tooth brushing method was the most common education contents. Skill demonstration was the most common teaching method. 4. There was a positive correlation between experience and implementation of oral health education. 5. Use of education media accounted for 74.1% in oral health education. The number of media was more than two to five. 6. Self-devised media contents were the most commonly used in oral health education. Visual materials, dentiform and tooth brush were the most common contents in oral health education. Conclusions : It is necessary to develop the systematic and repetitive oral health education curriculum for the children education institute teachers. The dissemination of media for oral care is needed for oral health care knowledge acquisition.