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이종식,강종국,김종구 ( Jong Sik Lee,Jong Gook Kang,Jong Gu Kim ) 한국환경농학회 1993 한국환경농학회지 Vol.12 No.1
The water quality at Seomjin River stream was surveyed at 8 sites of main stream and 4 sites of tributaries for 6 months from April to September in 1989. The overall results are summarized as follows: 1. Do concentration of main stream ranged from 7.5 to 9.0 ppm. 2. The average No₃-N content of main stream was increased to 3.86 ppm at June, thereafter it was decreased by dilution with rainwater. 3. The water quality of Seomjin River stream was suitable for the irrigation source with the exception of site 8 where the contents of EC, Cl ̄ and SO₄^(2-) were very high according to the influence of sea water. 4. In the influence of tributaries on changes of the water quality along the Seomjin River, the water quality of main stream was deteriorated with inflow of Osu-cheon and Yo-cheon in the middle stream, but thereafter it was recovered with inflow of Boseong River and Hwangjeon-cheon. 5. The Yo-cheon was rapidly polluted by the sewage of Namweon city, that is, contents of COD and NO₃-N were incresed from 0.97 to 7.10 ppm and from 1.86 to 3.11 ppm respectively.
삼차원적으로 연결된 미세다공성 구조를 가진 이상인산칼슘 골이식재의 골치유에 관한 조직계측학적 평가
이종식,최석규,류경호,박광범,장제희,이재목,서조영,박진우,Lee, Jong-Sik,Choi, Seok-Kyu,Ryoo, Gyeong-Ho,Park, Kwang-Bum,Jang, Je-Hee,Lee, Jae-Mok,Suh, Jo-Young,Park, Jin-Woo 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.2
Purpose: The purpose of this study was to histomorphometrically evaluate the osteoconductivity of a new biphasic calcium phosphate ceramics with fully interconnected microporous structure. Material and Methods: Osseous defects created in the rabbit calvaria were filled with four different bone graft substitutes. Experimental sites were filled with a new fully interconnected microporous biphasic calcium phosphate with(BCP-2) or without(BCP-1) internal macropore of $4400\;{\mu}m$ in diameter. MBCP(Biomatlante, France) and Bio-Oss(Geistlich Pharma, Switzerland) were used as controls in this study. Histomorphometric evaluation was performed at 4 and 8 weeks after surgery. Result: In histologic evaluation, new bone formation and direct bony contact with the graft particles were observed in all four groups. At 4 weeks, BCP-1(15.5%) and BCP-2(15.5%) groups showed greater amount of newly formed mineralized bone area(NB%) compared to BO(11.4%) and MBCP(10.3%) groups. The amounts of NB% at 8 weeks were greater than those of 4 weeks in all four groups, but there was no statistically significant differences in NB% between the groups. Conclusion: These results indicate that new bone substitutes, BCP with interconnected microporous structure and with or without internal macroporous structures, have the osteoconductivity comparable to those of commercially available bone substitutes, MBCP and Bio-Oss.
이종식,Lee, Jong-Sik 한국정보통신집흥협회 1995 정보화사회 Vol.89 No.-
보행자전용 휴대전화(일명 : 시티폰)가 서울 여의도 지역에서 선보여 세간에 화제가 되고 있다. 비록 시범서비스중이지만 편리성, 저렴한 비용, 높은 보안성으로 인해 조만간 이동통신시장을 위협할 다크호스로 떠오를 것으로 전망된다. 이에 도입배경, 특징, 해외동향 그리고 향후 계획을 중심으로 시티폰서비스의 세계에 접근해 본다.
인공산성비에 의한 농작물 잎의 조직형태 변화에 관한 연구 - Ⅱ. 벼 , 콩 , 보리 , 무에 관하여 -
이종식,김복진,정구복 ( Jong Sik Lee,Bok Jin Kim,Goo Bok Jung ) 한국환경농학회 1996 한국환경농학회지 Vol.15 No.1
To investigate the alterations of ultrastructure of leaves by acid rain, 10mm of SAR(Simulated Acid Rain, pH 2.0, 2.5, 2.7, 3.0, 6.0) were applied to 4 crops(rice, soybean, barley, and radish) at the two day interval. The symptoms of leaf damage by SAR were observed by naked eyes and SEM(Scanning Electron Microscope). The results are summarized as follow: Visible leaf injury were more serious in dicots than monocots such as rice and barley with the order of bean, radish, rice, barley. With the SAR treatment of pH 2.0, histological perturbation of trichome were developed in bean and radish. And with the SAR treatment of pH 2.5, stomata of all tested crops except rice were deshaped.
인공산성비에 의한 농작물 잎의 조직형태 변화에 관한 연구 - Ⅰ. 고추 , 들깨 및 가지에 관하여 -
이종식,김복영,최선,이규승 ( Jong Sik Lee,Bok Young Kim,Sun Choi,Kyu Seung Lee ) 한국환경농학회 1995 한국환경농학회지 Vol.14 No.3
To investigate the alterations in the ultrastructure of leaves by acid rain, 10㎜ of SAR(Simulated Acid Rain, pH 2.0, 2.7, 3.0, 6.0) was applied to three crops(red-pepper, perilla, eggplant) at a two-day interval. The symptoms of leaf damage by SAR were observed by naked eyes and SEM(Scanning Electron Microscope), and the peroxidase activity in the leaves was measured. The results are summarized as follows : The severity of SAR damages to the crops observed by naked eye were in the decreasing order of red-pepper, perilla, and eggplant. The Symptoms were characterized by brown or white spots on the leaf surface. In the SAR treatment of pH 3.0, trichomes of all crops except for eggplant were damaged. By the SAR treatment of pH 2.7, stomata were damaged in all crops. With one time treatment of SAR, the peroxidase activity of perilla was rapidly increased.
이종식,김복영 ( Jong Sik Lee,Bok Young Kim ) 한국환경농학회 1994 한국환경농학회지 Vol.13 No.3
In this paper, the current knowledge on the formation of acid rain and its effect on vegetation are reviewed. The pollutants which were emitted into the air are oxidized by photochemical reaction and affect the vegetation by dry and wet deposition. Acid rain at pH 4.0 affected sensitive plants and when it was below pH 3.0, visible symptoms developed in most of the crops. The acid rain treatment at pH 2.0 decreased dry weight, leaf area and chlorophyll contents in soybean but it increased rate of photosynthesis and respiration rate. Rain treatment at pH 2.8 increased ethylene production, but it`s not a suitable indicator of sensitivity to acid rain. At pH 2.0 treatment, the contents of soluble Mn and Al were increased but the cultivated soil pH at upper layer(0-5㎝) was significantly decreased. The pertubation of glandular trichome which is existed along the vein was developed at all treatment except the control(pH 6.0) and non-treatment. Histological pertubation of spiked trichome and disintegration of chloroplast were developed only on the leaves of sesame treated with SAR(simulated acid rain) of pH 2.0.
이종식,김복영,우기대 ( Jong Sik Lee,Bok Young Kim,Ki Dae Woo ) 한국환경농학회 1994 한국환경농학회지 Vol.13 No.1
This study was carried out to investigate the possibility of potential injury to crops which were exposed to precipitation. The rainwater were collected from May to September in 1992 and analyzed its chemical composition. The amounts of chlorophyll and cations in plant were measured, and the morphological structure of epidermis was also investigated by SEM. The results are summarized as follows: 1. The pH of precipitation in Suwon was relatively high even with high level of SO₄^(2-) and monthly pH at May, June, July, August, and September were 4.65, 5.47, 5.32, 5.44 and 4.80, respectively. 2. The amount of ions in rainwater was in the order of NH₄^+, Ca^(2+), Mg(2+) and H^+ for cations, and SO₄^(2-), NO₃^- and Cl^- for anions. 3. pH of rain in less than 5mm of precipitation was higher than that in greater than 5mm of precipitation. 4. The amount of chlorophyll was higher in the plant exposed to rain than that in plant intercepted rain during the early portion of growing season, but at the later period, the trend was shown to be reversed. 5. When the sesame plants were exposed to rain at harvesting stage, they contained less amount of CaO, MgO and Na₂O than those with the interception of rain. 6. Scanning electron microphotographs revealed the shringkage in glandular trichomes in the epidermis of sesame leaves when they were exposed to rain.
이종식,박진우,서조영,이재목,Lee, Jong-Sik,Park, Jin-Woo,Suh, Jo-Young,Lee, Jae-Mok 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.2
Purpose: Many clinical studies have reported that higher success rates are achieved with teeth that have immature roots than other autotransplanted teeth that have more immature root. However, based on date published recently, the success rate of autotransplantation of teeth with complete root formation was higher. The purpose of this study was to examine the long term(2 to 6 years follow-up) success rate of autotransplantation of third molar with complete root formation and to discuss some conditions and prerequisites for success. Materials and Methods: 26 sites of 24 patients aged 26 to 55 (mean age 40.8) were autotransplanted with third molars with complete root formation. These cases were followed for 2 to 6 years after surgery. The success criteria included (1) no discomfort during functioning (2) absence of progressive root resorption and alveolar bone resorption. Result: Of 26 teeth 5 teeth were failed, therefore success rate is 81%(21/26 teeth). The results suggested that higher success rate is acquired from (1) extraction socket due to dental caries (2) mandibular recipient site (3) patient younger than 40 years old. Autotransplantation of third molar to replace molars with advanced periodontal disease also showed considerably high success rate(84%). Conclusion: With appropriate case selection, autotransplantation of third molar with complete root formation remains a viable alternative for replacing a missing molar tooth.