인천지역 한 대학병원에서 진단된 기관지천식 중 직업관련성 천식

채창호,진영우,김은아,최승원,강성규,최용휴 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.2

Bronchial Asthma could be developed by occupational origin. 4-16% of bronchial asthmas are known to be related to occupational exposure. However, occupational asthma has not been reported from the periodic occupational health examination, but reported through case report from clinicians. The authors analysed hospital records to find out work-related bronchial asthma and their occupational characteristics at a university hospital in Inchon. All records which were confirmed as bronchial asthma in adult by an allegist from June, 1996 to May, 1998 were selected. Through record reviewing, any suspected work related asthma was selected and the inteview was done by phone or at the out-patient clinic. The possible cases were confirmed by additional tests including specific bronchial provocation test. Sixteen(3.9%) out of 411 bronchial asthma were confirmed as work-related asthma. Eight cases out of 16 worked at furniture industry, three worked at dye manufacturing and two worked at musical instrument manufacturing industry. Others worked at farm and machinary industry. The confirmed asthmogen were toluene diisocyante(8), reactive dye(3), and grain dust(1). None of the cases was detected as work-related asthma in the periodic health examination. Twelve out of sixteen occupational asthma patients discontinued their work. The results suggested that many patients with occupational asthma were not reported and the periodic health examination was not an effective system for detecting the workrelated asthma. Thus setting up the surveillance system involving allergist or pulmonologist would be important to detect and prevent occupational asthma.

Effects of LED Light Illumination on Germination, Growth and Anthocyanin Content of Dandelion (Taraxacum officinale)

Ryu, Jai Hyunk,Seo, Kyoung Sun,Choi, Gab Lim,Rha, Eui Shik,Lee, Sheong Chun,Choi, Seong Kyu,Kang, Si-Yong,Bae, Chang-Hyu The Plant Resources Society of Korea 2012 한국자원식물학회지 Vol.25 No.6

Dandelion has been widely utilized for medicinal and edible purposes. This research was conducted to evaluate the effect of supplemental LED (light-emitting diode) light on germination, growth characteristics and anthocyanin content of dandelion (Taraxacum officinale) seedling using LED blue (460 nm), red (660 nm, R), blue + red (B:R=6:4) and fluorescent lamp light treatment. By LED illumination to T. officinale seed germination speed was delayed, and germination rate was the highest in the fluorescent light. The growth characteristics (plant height, number of leaves, root length and fresh weight) were greatly influenced by supplemental LED light compared with control treatment, and the growth promotion was the most effective in the red LED illumination. After 60 days of red and mixed LED light treatments, anthocyanin content of dandelion plants was significantly changed. The anthocyanin content was increased by 12~19 mg/100 g under the red LED and the mixed light conditions compared with the control and the blue LED. Results indicate that illumination with red and mix LEDs, compared with other light treatments, is beneficial for promotion of growth and anthocyanin content in dandelion.

Phytoplankton Community in Adjacent Waters of Ulchin Nuclear Power Plant

( Hyu Chang Choi ),( Yeon Shik Kang ),( In Sung Jeon ) 한국환경생물학회 2004 환경생물 : 환경생물학회지 Vol.22 No.3

N/A To understand the phytoplankton community in adjacent waters of Ulchin nuclear power plant (UNPP), abundance and the size fractionated chl-a concentrations were evaluated through seasonal interval sampling from April 2003 to February 2004. A total of 211 different phytoplankton species was observed and mean abundance of phytoplankton in each study period ranged from 244,286 to 1,221,779 cells L^(-1). The contributions of microplankton (>20 μm) to total phytoplankton abundance ranged from 42.5 to 83.6% (average 66.1%) and those of nanoplankton (<20 μm) ranged from 16.4 to 57.5% (average 33.9%). Total chl-α concentrations of phytoplankton ranged from 0.52 to 2.26 μg L^(-1). The contribution of chl-α concentrations of microplankton was higher than that of nano- and picoplankton through the study period with exception of July 2003. The results of abundances and chl-α concentrations suggest that microplankton has an important role in adjacent waters of UNPP. The diminution of abundances and chl-a concentrations of phytoplankton was observed after passage through the cooling water system, but it was gradually recovered by mixing with the ambient waters. Our results suggested that the influence of thermal discharges on phytoplankton should be restricted within narrow limits around outlet area of thermal effluents.

Sampling Design of SSCs for Characterization at Shut-Down Power Plant

Hyu Chang Choi,Jong Sun Hwang,Hye Jin Jung,Byong Sop Lim,Jong Hyuk Hong,Yo Gyeong Yun,Yoon Seok Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.2

The radiological characterization of SSCs (Structure, Systems and Components) plays one of the most important role for the decommissioning of KORI Unit-1 during the preparation periods. Generally, a regulatory body and laws relating to the decommissioning focus on the separation and appropriate disposal or storage of radiological waste including ILW (intermediate level waste), LLW (low level waste), VLLW (very low level waste) and CW (clearance waste), aligned with their contamination characteristics. The result of the preliminary radiological characterization of KORI Unit-1 indicated that, apart from neutron activated the RV (reactor vessel), RVI (reactor vessel internals), and BS (biological shielding concrete), the majorities of contamination were sorted to be less than LLW. Radiological contamination can be evaluated into two methods. Due to the difficulties of directly measuring contamination on the interior surfaces of the pipe, called CRUD, the assessment was implemented by modeling method, that is measuring contamination on the exterior surfaces of the pipes and calculating relative factors such as thickness and size. This indirect method may be affected by the surrounding radiation distribution, and only a few gamma nuclides can be measured. Therefore, it has limitation in terms of providing detailed nuclide information. Especially, α and β nuclides can only be estimated roughly by scaling factors, comparing their relative ratios with the existing gamma results. To overcome the limitation of indirect measurement, a destructive sampling method has been employed to assess the contamination of the systems and component. Samples are physically taken some parts of the systems or components and subsequently analyzed in the laboratory to evaluate detailed nuclides and total contamination. For the characterization of KORI Unit-1, we conducted the radiation measurement on the exterior surfaces of components using portable instruments (Eberline E-600 SPA3, Thermo G20-10, Thermo G10, Thermo FH40TG) at BR (boron recycle system) and SP (containment spray system) in primary system. Based on these results, the ProUCL program was employed to determine the destructive sample collection quantities based on statistical approach. The total of 5 and 8 destructive sample quantities were decided by program and successfully collected from the BR and SP systems, respectively. Samples were moved to laboratory and analyzed for the detail nuclide characteristics. The outcomes of this study are expected to serve as valuable information for estimating the types and quantities of radiological waste generated by decommissioning of KORI Unit-1.

VDT작업이 안 조절반응과 동공 대광반사에 미치는 영향

김은아,김양호,진영우,채창호,최용휴,문영한,Kim, Eun-A,Kim, Yang-Ho,Jin, Young-Woo,Chai, Chang-Ho,Choi, Yong-Hyu,Moon, Young-Hahan 대한예방의학회 1997 예방의학회지 Vol.30 No.3

6명의 20대 여성을 대상으로 VDT작업으로 인한 조절반응 및 동공대광반사의 작업부과에 따른 변화와 다른 사무작업을 부과할 때와의 차이를 보았다. 그 결과 다음과 같은 결과를 얻었다. 1. VDT작업에서 작업부과 시간이 증가함에 따라 조절 수축속도가 감소했으며 1시간의 휴식시간 후에는 현저하게 증가했고 다시 작업을 부과함에 따라 감소하는 경향을 보였다. 조절 수축속도의 변화보다는 뚜렷하지 않지만 이완속도도 VDT작업부과에 따라 감소되고 휴식에 의한 회복되는 경향을 보였다. 2. 일반 사무작업과 근거리 사무작업에서는 조절 수축속도에서 VDT작업부과때와 같은 반응은 보이지 않았으며, 근거리 사무작업에서 이완속도가 작업부과에 따라 감소하였으나 휴식 후 회복되지 않았다. 3. 동공대광반사에서 최초동공직경, 최초동공면적은 VDT작업에서만 작업시간의 증가에 따라 유의한 감소를 보였는데 휴식 후 회복되지 않았다. 이러한 결과는 조절 수축속도의 변화, 조절 이완속도, 동공직경과 면적의 변화가 VDT작업의 특성을 연구하는데 사용될 가능성을 보여주며, 이를 위해서 연구대상이 개인차, 생체리듬, 감정적 자극 등을 보정한 연구가 필요하다고 생각된다. We studied on change of lens accommodation and pupil light reflex caused by VDT work in six women and compared them with those of other office works. The results were as follows. 1. In VDT work the accommodation contraction velocity decreased during the first 2-hr VDT task, then recovered markedly by the end of the one-hour lunch break, and decreased again by the end of the 2nd 2-hr VDT task. Changes of relaxation velocity showed similar pattern although it was less typical than that of contraction velocity 2. There was no marked change in accommodation contraction velocity and amplitude of accommodation in general office work and near-distance office work, and in the near-distance office work accommodation relaxation velocity decreased according to work load without recovery after lunch break. 3. Initial pupil diameter, initial pupil area of light reflex decreased significantly during VDT task only in VDT work and didn't recover after lunch break. These results suggest possibility that changes of accommodation contraction velocity, accommodation relaxation velocity, near point distance, and pupil diameter and area are useful in evaluating characteristics of VDT work. For this, more research adjusted individual differences, circadian rhythm, emotional stress needs.

Analysis on the Pigment Composition of Phytoplankton Assemblages using HPLC (High Performance Liquid Chromatography) in the Adjacent Waters of Nuclear Power Plants in Spring

Choi, Hyu-Chang,Kang, Yeon-Shik,Choi, Joong-Ki,Song, Tae-Yoon,Yoo, Man-Ho The Korean Society of Oceanography 2004 Journal of the Korean Society of Oceanography Vol.39 No.4

The pigment composition and concentration of phytoplankton assemblages using HPLC in the adjacent waters of four nuclear power plants (Yonggwang, Kori, Wolsong and Ulchin) were investigated during the spring blooming in 2004. The mean concentration of chlorophyll a ranged from 563.8 to 2,949.0ng $l^{-1}$, with the lowest concentration at Kori and the highest concentration at Wolsong. Among the carotenoids, the amounts of fucoxanthin and chlorophyll $C_2$ were relatively higher than those of other pigments in the study site. As minor pigments, zeaxanthin, chlorophyll b, 19'-butanoyloxyfucoxanthin, diadinoxanthin, 19'-hexanoyloxyfucoxanthin, chlorophyll $C_3$ and peridinin were detected. The results of pigment composition and concentration showed that diatoms had an important proportion of phytoplankton community when a spring bloom occurred. Cyanobacteria was present relatively low density at the Wolsong and the green alga such as chlorophytes and prasinophytes were abundant at the Yonggwang and Kori, while dinoflagellates characterized by peridinin were common at Ulchin and Kori. The pigment composition and concentration of phytoplankton after passing through the cooling-water system of nuclear power plant were highly variable. No distinct trend of the change of each pigment composition and amount was detected but the variation of fucoxanthin and chlorophyll $C_2$ highly coupled with that of chlorophyll a. We pointed out that the diatom controlled the overall variation of phytoplankton biomass during the spring season.

간척지 토양특성에 알맞은 사료작물 작부체계 연구

양창휴(Chang-Hyu Yang),이장희(Jang-Hee Lee),김선(Sun Kim),정재혁(Jae-Hyeok Jeong),백남현(Nam-Hyun Ba다),최원영(Weon-Young Choi),이상복(Sang-Bok Lee),김영두(Young-Doo Kim),김시주(Si-Ju Kim),이경보(Gyeong-Bo Lee) 한국토양비료학회 2012 한국토양비료학회지 Vol.45 No.3

본 연구는 새만금간척지 광활 및 계화지구 신간척지에서 조사료의 안정생산을 위한 적정 작부체계를 설정코자 2009년 10월부터 2011년 10월까지 수행하였다. 동계 사료작물로 청보리 (영양), 호밀 (곡우), 이탈리안 라이그라스 (passerel plus)와 하계 사료작물로 옥수수 (광평옥), 수수×수단그라스 (G7)를 재배하여 토양화학성, 양분흡수량, 사료가치, 생육 및 수량성을 검토하였다. 시험전 토양은 유기물, 유효인산 및 치환성칼슘 함량이 매우 적었고 치환성마그네슘?나트륨 함량이 많은 알칼리성 염류토양 이었다. 재배기간 동안 토양염농도 변화는 0.2%이하를 나타냈고 염피해는 없었다. 동계 사료작물 입모율은 호밀 〉 청보리 〉이탈리안 라이그라스 순으로 양호하였고 생초 및 건물수량은 이탈리안 라이그라스 〉 호밀 〉 청보리 순으로 높았다. 조단백 함량은 이탈리안 라이그라스 〉 청보리 〉 호밀 순으로 총가소화영양 함량은 청보리 〉 이탈리안 라이그라스 〉 호밀 순으로 많은 경향을 나타냈다. 하계 사료작물 조단백질 및 중성용매불용성섬유, 산성용매불용성섬유 함량은 수수×수단 그라스에서 총가소화영양 함량은 옥수수에서 높았다. 동?하계 사료작물 경엽 및 곡실의 무기양분 함량은 이탈리안 라이그라스와 옥수수에서 높았다. 시험 후 토양화학성은 pH가 낮아지고 총질소 및 유효인산, 치환성칼륨?칼슘 함량이 증가한 반면에 유기물, 치환성마그네슘?나트륨 함량이 감소되는 경향을 나타냈다. 동작물과 하작물을 연계한 수량성 (‘10∼’11)에서 생초수량은 청보리 - 옥수수 (74,740 kg ha<SUP>-1</SUP>) 대비 IRG - 수수×수단그라스 10%, IRG - 옥수수 7%, 호밀 - 수수×수단그라스 6%, 호밀 - 옥수수 및 청보리 - 수수×수단그라스 3% 증수되었고 건물수량은 청보리 - 옥수수 (20,280kg ha<SUP>-1</SUP>) 대비 IRG - 수수×수단그라스 7%, 호밀 - 수수×수단그라스 6%, IRG - 옥수수 3%, 청보리 - 수수×수단그라스 3%, 호밀 - 옥수수 3% 증수되었으며 TDN수량은 청보리 - 옥수수 (13,830 kg ha<SUP>-1</SUP>) 대비 IRG - 수수×수단그라스 2%, 청보리 - 수수×수단그라스 및 IRG - 옥수수 1% 증수되었다. 따라서 생초, 건물수량 및 TDN수량이 높은 “IRG -수수×수단그라스” 및 “청보리 - 수수×수단그라스” 조합을 신간척지 토양특성 (사양토, 배수약간불량, 토양염농도 0.2% 이하)에 알맞은 사료작물 작부조합으로 판단되었다. This study was conducted to find out the optimum cropping system for the stable production of forage crops in the newly reclaimed land located at Gwanghwal and Gyehwa region of Saemangum reclaimed tide land from October, 2009 to October, 2011. Whole crop barley (WCB), Rye, Italyan-ryegrass (IRG) as winter crops and Corn, Sorghum×sudangrass hybrid (SSH) as summer crops were cultivated. Soil chemical properties, nutrient uptake, feed value, growth and yield were examinated. The testing soil was showed saline alkali soil where the contents of organic matter, available phosphate and exchangeable calcium were very low, while exchangeable sodium and magnesium were higher. Changes of soil salinity during the growing season of forage crops were less than 0.2%, and the growth of forage crops was not affected by salt injury. Standing rates of winter crops were higher in the order of Rye, WCB, and IRG, while the dry matter yield of winter crops was higher in the order of IRG, Rye and WCB. The highest crude protein (CP) content was recorded in IRG, and total digestive nutrients (TDN) contents were increased in the order of WCB, IRG, and Rye. The TDN content was higher in corn, whereas other feed value was higher in SSH. The content of mineral nutrients on stem, leaf and grain in IRG, Corn were high. After experiment pH was lowed, contents of exchangeable magnesium, sodium and organic matter were decreased while contents of total nitrogen, available phosphate and exchangeable potassium, calcium were increased. Winer crops and summer crops after continually cultivating in cropping system, fresh matter yield increased, compared to WCB-Corn (74,740 kg ha<SUP>-1</SUP>), IRG-SSH 10%, IRG-Corn 7%, Rye-SSH 6%, Rye-Corn and WCB-SSH 3%. Dry matter yield increased, compared to WCB-Corn (20,280 kg ha<SUP>-1</SUP>), IRG-SSH 7%, Rye-SSH 6%, IRG-Corn/Rye-Corn/WCB -SSH 3%. The TDN yield increased, compared to WCB-Corn (13,830 kg ha<SUP>-1</SUP>), IRG-SSH 2%, WCB-SSH and IRG-Corn 1%. Therefore, we suggest that the crop combination of IRG-SSH and WCB-SSH would be preferred for silage stable production.

벼 재배시 녹비작물 혼입에 따른 지력개선 효과

양창휴(Chang-Hyu Yang),유진희(Jin-Hee Ryu),김택겸(Taek-Kyum Kim),이상복(Sang-Bog Lee),김재덕(Jae-Duk Kim),백남현(Nam-Hyun Baek),김선(Sun Kim),최원영(Weon-Young Choi),김시주(Si-Ju Kim) 한국토양비료학회 2009 한국토양비료학회지 Vol.42 No.5

본 시험은 벼 재배시 녹비작물로 녹비용 보리의 투입효과를 구명하여 호밀 대체 가능성을 검토코자 수행하였다. 호밀은 출수기, 녹비용 보리는 출수기, 출수후 3일 및 출수 후 10일에 경운로타리 작업을 하고 담수시켜 부숙을 촉진한 다음 녹비작물 무시용구는 표준시비, 녹비작물 시용구는 토양검정시비 및 무시비 하여 동진 1호를 재배 후 토양물리화학성, 녹비작물 부숙정도, 생육 및 수량성을 검토한 결과는 다음과 같다. 녹비작물 투입시기별 생체중은 각각 10a당 2,715, 2,352, 2,867 ㎏이였고 건물중에 있어서 총질소 함량은 1.31, 1.46, 1.38%이었으며 탄질률은 33.4, 28.7, 34.6이였다. 녹비작물 투입으로 작토심이 깊어졌고 토양경도와 용적밀도가 낮아졌으며 공극률이 증가하여 물리성이 개선되었다. 또한 시험 전에 비하여 녹비용 보리 환원으로 양이온치환용량이 높아졌으며 치환성 양이온 함량이 증가되는 경향을 나타냈다. 쌀 수량은 관행(559 ㎏ 10a-1)에 비하여 녹비용 보리+토양검정진단시비구에서 3∼9% 증수되었으며, 현미 외관품위 중 완전립비율은 관행(73.0%)에 비하여 녹비용 보리 투입시 73.6∼78.7%로 높은 경향을 나타냈다. 결론적으로 녹비용 보리를 출수 후 10일경 투입하여 벼 재배시 질소비료 절감과 지력개선에 효과적인 것으로 판단되었다. This study was carried out to investigate the improvement effect of soil fertility by incorporation of GMC(green manure crops) at rice cropping after cultivation GMC such as the barley for alternative rye in paddy field over the past two years(2006~2007). Plots, which consisted of incorporation time of GMC as rye; heading stage, barley; heading stage, heading stage of rye and 10days after heading stage were divided by amount of applied rates; standard fertilizer fertilization, diagnosis fertilization and non-fertilization. we investigated change of soil physico-chemical properties, degree of decomposition on GMC in soil, growth and yield potential. The obtained results were summarized as follows. The fresh weight of GMC at incorporation time on heading stage of rye, heading stage and 10days after heading stage of barley were 2,715, 2,352, 2,867 ㎏ 10a?¹ respectively. Content of total nitrogen at three incorporation times was 1.31, 1.46, 1.38% and the C/N ratio were 33.4, 28.7, and 34.6, respectively. Some soil physical properties, such as soil hardness and bulk density tended to decrease with incorporation of GMC, while surface soil depth and porosity were increased. Some soil chemical properties, such as content of exchangeable cations and cation exchangeable capasity(CEC) were increased with incorporation of GMC compared with before experiment. Rice yields was increased 3~9% in diagnosis application plots on application of barley compared with control(559 ㎏ 10a?¹) and incorporation of barley caused to improve perfect kernel ratio 73.6~78.7% in appearance characteristics of brown rice compared with cotrol(73.0%). It was found that incorporation with 10days after heading stage of barley was more effective to reduce chemical nitrogen fertilizer and to improve soil fertility.

인천지역 한 대학병원에서 진단된 수근관 증후군환자의 직업 관련성

최용휴,박정일,임종한,강성규,채창호 大韓産業醫學會 1999 대한직업환경의학회지 Vol.11 No.3

Objectives: The study was carried out to evaluate the work-relatedness and the occupational distribution in 147 carpal tunnel syndrome(CTS) cases diagnosed at a university hospital from May 1996 to May 1998. Methods: We obtained the information on disease appearance, occupational history including job content and other life style by medical records and telephone interviews. Results: Of the 147 patients with carpal tunnel syndrome, 51 patients(34.7%) were shown to be work-related. Work-related CTS were most frequent in elementary workers (21 case, 41.2%). The other cases were 15(29.4%) workers in service and shop and market sales, 9(17.6%) workers in craft and related trades, 4(7.8%) workers in skilled agriculture and fishery. Only two workers had claimed to the Industrial Accident Compensation Insurance, but no one has been admitted as an occupational CTS yet. Conclusions: It is suggested that arrangements of surveillance system for adequate control of occupational CTD is neccessity.

Tuber rot of Gastrodia elata by Fusarium spp.

Chang Su Kim,Hyo Jin Kim,Sang Young Seo,Min Sil Ahn,In Young Choi,Han Na Lee,Hee Jun Kim,Wang Hyu Lee 한국농약과학회 2018 한국농약과학회 학술발표대회 논문집 Vol.2018 No.10