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정기웅 계명대학교 산업경영연구소 2001 經營經濟 Vol.34 No.1
Three factors such as liquidity improvement, resolution of asymmetric information and moral hazard should be considered for the introduction of REITS in Korea. First of all, for the improvement of liquidity, there are six factors which should be taken into consideration: 1) exclusion of dual corporate taxes, 2) decrease in taxes related to real estate investment, 3) providing institutional investors with I incentives for participation, 4) temporary decrease in transaction fees, 5) alleviation of requirements for the listing on exchange, 6) improvements of market makers' role. Second, for the resolution of asymmetric information, there are five factors which should be taken into consideration: 1) introduction of mortgage-type and closed REITS rather than equity-type and open REITS, 2) transparency of accounting and corporate control, 3) enforcement of information disclosure, 4) development of real estate appraisal technique, 5) rearing of corporate analysts. Last, for the solution of moral hazard and agency problems, there are five factors which should be taken into consideration: 1) admission of specific business areas alone, 2) allowance for REITS' management of real estate, 3) introduction of supervisor executive system, 4) admission of M&A among REITS, 5) enforcement of the monitoring for REITS managers.
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閔雄基,張珍成,全正壹,金輝,崔道烈,鄭承洙 서울대학교 수목원 2000 서울大學校 樹木園 硏究報告 Vol.- No.20
This study was carried out to investigate the flora of Mts. Dae-am, Dae-woo, Baek-suk, and Sa-myung located on the east side of DMZ in province Yang-gu-gun, from July 1999 to August 2000. Although two hundred and fifty eight vascular plant taxa (70 families 167 genera) were recorded, this was only a part of representatives in this community because of the restrictin of collections within the military zone. The overall forest stand age of this area was 40 to 50 years, but occasionally ca 70 years old trees were found. We reported 11 taxa of the rare and endangered species proposed by the Ministry of Environment in this area. The Yong-neup, the only high altitude (alt. 1,200m) moore in south Korea, are located in the peak of Mt. Dae-am-san. Some species of this moore (Carex chordorrhiza Ehrh., Carex limosa L., and Gentiana jamesii Hemsl.) - were only found in south Korea. This moor would suffer vegetation change by natural moorland succession and human disturbances. The long-term monitoring of variation of annual vegetation, species distribution, numbers and distribution pattern of individuals of rare species are recommended for the wetland conservation.
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閔雄基,張珍成,全正壹,金輝,崔道烈,金承昆 서울대학교 수목원 2001 서울大學校 樹木園 硏究報告 Vol.- No.21
This study was carried out to investigate the flora of Mt. Undal (alt. 1,097.2m) located on the northwestern side of province Gyeongsangbuk-do, near Myngyeong-si city, from April 2000 to Sept. 2000. Total number of vascular plants discovered in Mt. Undal were 70 families, 154 genera, and 243 taxa(including species, subspecies, varieties and forma). Major vegetation was Acer pictum var. mono - Quercus mongolica - Carpinus laxiflora community. The overall forest stand age of this area was 40 to 50 years, and occasionally ca 70 years old Abies holophylla trees were found. Although, there were no rare and endangered speices, we found two species of level IV by the Ministry of Environment - Anemone koraiensis Nakai, Anemone reflexa. Steph. et Willd.
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우리나라 카드뮴 폭로 근로자들의 혈중, 요중 카드뮴과 누적폭로 추정량에 따른 신장장해 평가
강성규,양정선,김기웅,장재연,정호근 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.1
88 workers exposed to cadmium were examined at the 12 factories using or producing cadmium in order to know the present state of cadmium exposure and renal dysfunction in 1992. Cadmium in blood and in urine were measured and compared by the 3 exposure level of cadmium in air. Cadmium in blood of low, moderate and high exposure group were 2.5, 3.8 and 7.6 ㎍/L, respectively. Cadmium in urine were 1.8(1.3), 3.8(2.6) and 7.9 ㎍/L(6.1 ㎍/g creatinine), respectively. However, there was no relationship between urinary cadmium and β₂-microglobulin. Cumulative exposure estimate(CEE) was calculated by multiplying the mean ambient cadmium level of the factory and working duration. CEE has a high correlation with cadmium in blood and urine, but no relation to β₂-microglobulin. Because working durations were relatively shorter than European workers', the highest CEE was just 300 ㎍·year/m³, which was not enough to induce renal tubular dysfunction. This study, however, suggested the possibility that renal tubular dysfunction caused by cadmium could be happened in Korea in the near future.
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강성규,홍정표,김기웅,장재연,정호근,정규철 大韓産業醫學會 1994 대한직업환경의학회지 Vol.6 No.2
Twenty-four factories registered at the Ministry of Labor as factories using or producing cadmium in 1991 were investigated to know the present state of occupational exposure to cadmium in 1992. Nine factories among 24 stopped using or changed to other substances and 1 factory didn't produce any more, but delivered it to other factories through imports. Therefore, only 14 factories were producing or using cadmium. But, alloying materials were supplied to about 20 and more factories, however, they couldn't be investigated because of limited information. Three factories had less than 50 workers were 3,6 had 50-300 and 5 had more than 300. About 167 workers were exposed to cadmium. According to the classification by process, there were 4 alloy processes, 2 refinary, 2 elctroplating, 2 dry cell making, 1 industrial battery making, 1 duplicator drum making, 1 recycling of battery and 1 copper refinary. 8 factories used metal cadmium, 3 cadmium oxide, 2 cadmium sulfide, and 1 cadmium hyroxide. One factory was importing cadmium stearates only and supplying them to the PVC making factories. The amount of metal cadmium producing in 2 refinary factories was about 50-65 ton per month. The other cadmium compounds were imported. According to exposure level of cadmium air of the 10 factories examined, each factory could be divided into high, moderate and low exposure groups. 1 battery recycling factory and 3 alloy factories were in the high exposure group and their mean air concentrations were 0.06679, 0.05481, 0.02492, and 0.003㎎/㎥, respectively. Refinary and industrial battery making factories were in the middle exposure group and their mean air concentrations were 0.00773 and 0.00613 ㎎/㎥, respectively. Finally, low exposure group were copper smelting, dry cell case making, duplicator drum making and electroplating factory and their mean air concentrations were 0.00096, 0.00071, 0.00057 and 0.00054 ㎎/㎥ respectively.
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京畿道의 植物相 : 태화산, 화야산, 대부도, 칠현산, 철마산, 검단산
崔道烈,張珍成,金正猷,全正壹,金輝,閔雄基,姜佑昌 서울대학교 수목원 2001 서울大學校 樹木園 硏究報告 Vol.- No.21
This study was conducted in order to explore general flora of the Gyounggi-do Province and to clarify the distribution of some specificated taxa of the Korea. Daebu-do Island, Mt. Taewha, Mt. Hwaya, Mt. Gumdan, Mt. Chilhyun and Mt. Chulma among eighth grade-area of the Degree of Green Naturality (DGN) within the boundary of the Gyounggi-do Province were visited to investigate local flora. The number of identified vascular plant species were as follow; Mt. Hwaya: 120 species (99 genera of 67 families), Mt. Teawha: 132 species (103 genera of 56 families), Daebu-do Island: 124 species (103 genera of 50 families), Mt. Chulma: 129 species (99 genera of 67 families), Mt. Gumdan: 121 species (96 genera of 52 families), Mt. Chilyun: 90 species (74 genera of 42 families). The endemic Clematis brachyura Maxim. was found to distribute Daeby-do. It seemed that plantation was occupying large area in forest of the Gyounggi-do Province. Forty two specificated taxa were identified and 3 taxa, 10 taxa, 5 taxa, and 24 taxa were sorted into forth grade, third grade, second grade, and first grade respectively. Mt. Taewha showed the highest record (16 taxa) in the number of specificated taxa, Mt. Hwaya was the next with 13 taxa. Mt, Chulma (12 taxa), Mt. Gumdan (11 taxa), Daebu-do Island (7 taxi), and Mt, Chylma (4 taxi) followed. Mt. Taewa and Mt. Whaya were found to be relatively higher in the score calculated front the specificated taxa distribution, while Daebu-do Island and Mt. Chilyun were lower, that difference was probably due in part to consequences of severe disturbance of human activities. With respect to the consequences of severe disturbance of human activities. With respect to the geographical proximity to the Gangwon Province, Mt. Hwaya showed higher similarity of the species composition to that of the Mt. Jumbong.
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스티렌 폭로 근로자들의 기중 및 혈중 스티렌과 요중 만델산의 관계 분석
정호근,강성규,양정선,김기웅,이종성,조영숙,박인정 大韓産業醫學會 1994 대한직업환경의학회지 Vol.6 No.1
The concentration of styrene in air in blood and mandelic acid in urine were checked for the 60 workers with normal liver function, exposed to styrene. Styrene in air were sampled with personal air sampler at least 4 hours and analyzed by gas chromatography. Blood and spot urine were collected at the end of shift with a vacuum tube and a polythylene bottle and analyzed by gas chromatography and high performance liquid chromatography. Means of air and blood styrene and urine mandelic acid were 8.16 ppm(geometric mean), 0.199 mg/L, and 0.519 g/g creatinine, respectively. The concentration of styrene in air and mandelic acid in urine were high in the FRP factories and low in polymerization factory. Styrene in blood showed large difference by the working process. Styrene in air showed a good correlation with mandelic acid in urine(r=0.6369) and styrene in blood(r=0.6371). The mandelic acid in urine and styrene in blood corresponded to exposure of 50 ppm styrene were 0.890 g/g creatinine and 0.434 mg/L. However, hippuric acid in urine did not show any correlation with styrene in air. Urine mandelic acid excretion expected ratio showed a tendency to decrease according to obesity index and to increase with alcohol consumption.
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