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비탈면의 생태복원을 위한 연속섬유보강토의 적용성에 관한 연구
고정현 ( Jeung Hyun Koh ),허영진 ( Young Jin Hur ),이용구 ( Yong Gu Lee ),김남춘 ( Nam Choon Kim ) 한국환경보건기술학회(구 한국환경복원녹화기술학회) 2010 한국환경복원기술학회지 Vol.13 No.3
A technology using continuous fiber soil reinforcement system for the creation of ecological restoration in a damaged area has been developed and introduced. The continuous fiber soil reinforcement system (Geofiber system) is an environmentally friendly slope protection technique that continuous fiber soil reinforced layers are constructed with green plantation on cut slope. The characteristics of this system in terms of the strength and hydraulic performance, and the vegetation were investigated in this study. The main objectives of this comparative study was to quantify the potential contribution of geofiber system for the revegetation on the cut slope in a damaged area. A Geofiber system was constructed to reinforce the lower layer of slopes and revegetation methods including wood chips were carried out on the upper layer by machineries. The results of monitoring during 3 years on cut slopes were as follows: 1) All the quadrat existed in the proper range for vegetation. 2) Species richness was 4.4 (site-1) and 18.5 (site-2) respectively. 3) The averaged coverage rates of quadrats was 90%. It is remarkable that the continuous fiber soil reinforcement system would be capable of applying to a damaged area and also would serve maintaining a healthier environment for floras. However, it behooves to continue monitoring on succession of vegetation for ecological restoration.
임목폐기물 파쇄칩을 활용한 녹화기술의 비탈면 적용성에 관한 연구
고정현 ( Jeung Hyun Koh ),허영진 ( Young Jin Hur ),이용구 ( Yong Koo Lee ),김남춘 ( Nam Choon Kim ) 한국환경복원기술학회 2010 한국환경복원기술학회지 Vol.13 No.1
The main objectives of this comparative study were 1) to quantify the potential contribution of wood chips to revegetation on the cut slope in a constructed area, 2) to compare the floristic similarity of species composition whether existing of wood chips in the soil media or not. Wood chips were combined with soil media in the ratio of 30%. The thin layer (1 cm, 3 cm) soil media revegetation methods and the thick layer (10 cm) soil media revegetation method were constructed on the cut slopes by machineries respectively. Also, comparative experiments the existence of wood chips in the soil media were conducted to evaluate the effects of wood chips on revegetation works. The total size of quadrat was 300 m2 (100 m2 × 3). The results of monitoring for 3 years on cut slopes were as follows: 1) All the quadrat existed in the proper range for vegetation. 2) Species richness of quadrat including wood chips was 10% more than those of commercial soil medias. 3) The coverage rates of quadrat including wood chips were similar or superior to those of conventional methods. It can be concluded that the use of wood chips would be effective to promote establishment of diverse landscape and vegetation. However, it behooves to continue monitoring on succession of vegetation for ecological restoration. Finally, adequate wood chips deposit and gathering methods should be studied properly.
고정현 ( Jeung Hyun Koh ),허영진 ( Young Jin Hur ),최재용 ( Jae Yong Choi ) 한국환경복원기술학회 2011 한국환경복원기술학회지 Vol.14 No.3
The purpose of this study is to examine the ecologically suitable restoration characteristics in riparian slopes constructed by continuous fiber soil reinforced system (Geofiber system) which does not contain the concrete materials. The findings are as follows:(1) as the tested soil was not washed away by rainfalls and floods, Geofiber could replace the concrete wall and gravity stone net bag technique from the civil engineering structural point of view; (2) after one year of the construction, it was monitored that land cover ratio was 80-90%, which indirectly shows that vegetation is safely maintained; and (3) at the same time, 5-8 flora species were found in each test grid and more importantly dominant species have been moved from alien species to native herbaceous plants. From the above findings, Geofiber system is recommendable to restore the riparian slopes in terms of stability and natural landscape points. However, a long term monitering is needed considering flora succession process in a given environment as well as suitability tests should be carried out through the comparative investigations in other environments.
Koo, Jeung-Hyun,Rhee, Kyoung-Suk,Koh, Hyoung-Won,Jang, Hyun-Young,Park, Byung-Hyun,Park, Jin-Woo D.A. Spandidos 2012 INTERNATIONAL JOURNAL OF MOLECULAR MEDICINE Vol.30 No.4
<P>In the present study, we investigated the effect of guggulsterone on melanogenesis in B16 melanoma cells and elucidated its possible mechanism of action. The effects of guggulsterone on melanogenesis were determined by assaying melanin synthesis and cellular tyrosinase activity in B16/F10 mouse melanoma cells. Guggulsterone dose-dependently inhibited isobutylmethylxanthine (IBMX)-induced melanogenesis and cellular tyrosinase activity with no cytotoxicity. Decreased melanin biosynthesis was accompanied by the reduced expression of melanogenesis-related genes, such as tyrosinase, microphthalmia-associated transcription factor, tyrosinase-related protein (TRP)-1 and TRP-2. Guggulsterone also inhibited α-melanocyte stimulating hormone- or forskolin-induced increases in melanogenesis, suggesting an action on the cAMP-dependent melanogenic pathway. Co-incubation with chenodeoxycholic acid, a well-known farnesoid-X receptor agonist, did not affect IBMX-induced melanogenesis. These results suggest that guggulsterone exerts a melanogenic inhibitory effect through the downregulation of tyrosinase expression.</P>
Koh, Young Jun,Kim, Hak-Zoo,Hwang, Seong-Ik,Lee, Jeung Eun,Oh, Nuri,Jung, Keehoon,Kim, Minah,Kim, Kyung Eun,Kim, Homin,Lim, Nam-Kyu,Jeon, Choon-Ju,Lee, Gyun Min,Jeon, Byeong Hwa,Nam, Do-Hyun,Sung, Hoo Elsevier 2010 CANCER CELL Vol.18 No.2
<P><B>Summary</B></P><P>Two vascular growth factor families, VEGF and the angiopoietins, play critical and coordinate roles in tumor progression and metastasis. A single inhibitor targeting both VEGF and angiopoietins is not available. Here, we developed a chimeric decoy receptor, namely double anti-angiogenic protein (DAAP), which can simultaneously bind VEGF-A and angiopoietins, blocking their actions. Compared to VEGF-Trap or Tie2-Fc, which block either VEGF-A or angiopoietins alone, we believe DAAP is a highly effective molecule for regressing tumor angiogenesis and metastasis in implanted and spontaneous solid tumors; it can also effectively reduce ascites formation and vascular leakage in an ovarian carcinoma model. Thus, simultaneous blockade of VEGF-A and angiopoietins with DAAP is an effective therapeutic strategy for blocking tumor angiogenesis, metastasis, and vascular leakage.</P> <P><B>Highlights</B></P><P>► DAAP simultaneously binds VEGF-A and angiopoietins, and blocks their actions ► DAAP effectively suppresses tumor angiogenesis, metastasis and vascular leakage ► DAAP is superior to VEGF-Trap plus Tie2-Fc in blocking tumor growth and metastasis ► Ang-2 is a therapeutic target to control tumor angiogenesis and vascular leakage</P>
Yu, Hyun-Jeung,Roh, Sook Young,Koh, Seong-Ho 대한감염학회 2008 감염과 화학요법 Vol.40 No.4
Cervical epidural abscess (CEA) is a very uncommon disease with diverse clinical presentations. Clinically, it is difficult to diagnose this disease, especially in early stage. We report an atypical case of CEA showing only progressive quadriparesis without any other symptoms or signs of CEA. From this experience, CEA must be considered when progressive quadriparesis without any specific cause is developed in immuno-compromised patients and diabetic patients with polyneuropathies.
Kim, Dal-Soo,Prak, Hyun-Cheol,Chun, Sam-Jae,Yu, Seung-Hun,Park, Kyong-Ju,Oh, Jeung-Haing,Shin, Kwang-Hoon,Koh, Young-Jin,Kim, Byung-Sup,Hahm, Young-Il,Chung, Bong-Koo The Korean Society of Plant Pathology 1999 Plant Pathology Journal Vol.15 No.1
Ethaboxam is the first proprietary fungicide developed in Korea, registered in 1998 and commercialized in 1999 by LG Chemical Ltd., Korea. It is a derivative of aminothiazole carboxamide and formulated into 25% wettable powder for practical application in fields. Ethaboxam effectively controlled cucumber downy mildew caused by Pseudoperonospora cubensis, potato late blight caused by Phytophthora infestans, and pepper Phytophthora blight caused by P. capsici, and was superior or comparable to the commercial standards, when foliarly sprayed 3∼5 times until dripping off at approximately 7-day intervals during the growing season. Ethaboxam was required at least 125 mg/liter and 250 mg/liter for effective control of cucumber downy mildew, and potato late blight and pepper Phytophthora blight, respectively. There was not phytotoxicity observed o leaves, stems or fruits of cucumber, potato and pepper from any trial.