사마귀류 추출물의 생물학적 활성 비교

허진철,황재삼,강석우,윤치영,이상한 慶北大學校農業科學技術硏究所 2007 慶北大農學誌 Vol.25 No.-

In order to investigate the availability of insect resources for agrobiotechnological or medical purposes, we examined antioxidant (DPPH and FRAP assay) and cell viability by oxidant stress and NO inhibition assay by treatment of the extracts of Statilia maculata Thunberg, Tenodera angustipennis Saussure and Tenodera aridifolia Stoll. We found that Tenodera angustipennis Saussure and Tenodera aridifolia Stoll extract (DW, etanol, methanol) had high levels of anti-oxidant activity, whereas Tenodera aridifolia Stoll extract showed increased cell viability by hydrogen peroxide and inhibition of NO production. These findings suggest that Statilia maculata Thunberg, Tenodera angustipennis Saussure and Tenodera aridifolia Stoll, extract have potentials to be developed for agrobiotechnology or medicinal use, indicating that mechanistic study including inhibition against molecular inflammation will show a possibility for the development of useful insect resources.

동해안 석호의 육수학적 조사(1): 청초호

허우명,이상균,권상용,김동진,김범철 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-

Water quality and pollution state of Lake Chungcho were evaluated during three years from 1998 to 2000. We surveyed physicochemical parameters, and TSI(trophic state index) was calculated using TP, Chl. a, and SD(secchi disc transparency) data of growing season average. Water samples were collected bimonthly except freezing season. During the study period, total annual precipitation in 1998, 1999 and 2000 year was 1,797, 1,722 and 1,345 mm, respectively. Salinity and conductivity were high (29.3±5.5 ppt, and 45,105±7,585 μS/cm) then other lagoons in the Eastern Coast of Korea. Chemocline was formed by salinity at 0.5~1.5m water depth. As a result of this, DO concentration of hypolimnion was below 3.0 mgO₂/L. Especially, when intense chemocline was formed, temperature of hypolimnion was higher than epilimnion. Secchi disc transparency, chlorophyll a, and COD were 0.8±0.3m, 15.7±20.7 mg/㎥, and 3.1±0.8 mgO₂/L, respecively. Most of TN/TP ratios below 20, but concentration of TN and TP was high. Values of TSI ranged between 59 and 77, indicating a eutrophic condition in this system.

마라톤 동호인들의 참여동기와 활동만족도에 관한 연구

허천,장진우,박승환 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.6

The purpose of this study is to analyze the motivation and degree of satisfaction of marathon runners. The subjects are composed of 295 members of marathon clubs in Kwang Won Kung Kee provinces. The result of this study is as follows. First, as a result of analyzing the involvement motivation of marathon runners among demographic characteristics, self-esteem sub variable shoved statistically significant difference according to sex, and the sub variable of psychological coping·self-esteem·social recognition showed statistically significant difference according to age. In addition, the sub variabie of life-meaning·psychological coring·self-esteem showed statistically significant difference according to the final education years, and the sub variable of life meaning·psychological coping·self-esteem·striving·social recognition showed statistically significant difference according to job, and the sub variabie of life meaning·psychological coping·self-esteem·competition·health orientation·social recognition showed statistically significant difference according to monthly income. Second, as a result of analyzing the degree of satisfaction among demographic characteristics in marathon runners, physical satisfaction sub variabie showed statistically significant difference according to sex, and the sub variable of educational·social·psychological satisfaction showed statistically significant difference according to the final education years, job, monthly income.

악하선에 발생한 방선균증

이진호,박인우,최항문,허민석,이삼선 대한구강악안면방사선학회 2000 Imaging Science in Dentistry Vol.30 No.2

Actinomycosis is defined as a chronic, specific, suppurative, granulomatous disease caused mainly by the anaerobic, gram positive organism, Actinomyces israelii. Actinomycosis in the salivary gland is a rare disease that is caused by an inhabitant of the normal flora. We report the case of the actinomycosis of submandibular gland. A 53-year old man presented with the swelling on left submandiblar area. The lesion was not painful but had been increasing for about 10 days. In the CT view, the internal portion of the mass showed homogeneous moderate signal. The mass had continuities with the inferior portion of the left enlarged submandibular gland. In the MRI, there was a mass that showed a buldging pattern inferiorly in the left submandibular gland without bony invasion sign. The biopsy shows the colony of special organism. Many filaments are discovered with clubbed ends diffused from center of colony. We diagnosed this disease as actinomycosis in the submandibular gland by the postoperational biopsy. (Korea J Oral Maxillofac radiol 2000; 30: 132-137)

구강외과 수술용 스텐트 기반 영상유도 수술 시스템의 개발

이우진,김대승,이원진,이삼선,최순철,허민석,허경회,김명진,이지호 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.3

Purpose : The purpose of this study was to develop a stent-based image guided surgery system and to apply it to oral and maxillofacial surgeries for anatomically complex sites. Materials and Methods : We devised a patient-specific stent for patient-to-image registration and navigation. Threedimensional positions of the reference probe and the tool probe were tracked by an optical camera system and the relative position of the handpiece drill tip to the reference probe was monitored continuously on the monitor of a PC. Using 8 landmarks for measuring accuracy, the spatial discrepancy between CT image coordinate and physical coordinate was calculated for testing the normality. Results : The accuracy over 8 anatomical landmarks showed an overall mean of 0.56±0.16 mm. The developed system was applied to a surgery for a vertical alveolar bone augmentation in right mandibular posterior area and possible interior alveolar nerve injury case of an impacted third molar. The developed system provided continuous monitoring of invisible anatomical structures during operation and 3D information for operation sites. The clinical challenge showed sufficient accuracy and availability of anatomically complex operation sites. Conclusion : The developed system showed sufficient accuracy and availability in oral and maxillofacial surgeries for anatomically complex sites. (Korean J Oral Maxillofac Radiol 2009; 39 : 149-56)

국내 주요 호수의 육수학적 조사(4): 주암호

김범철,박주현,허우명,임병진,황길순,최광순,최종수 江原大學校 附設 環境硏究所 2001 環境硏究 Vol.18 No.-

In this study limnological characteristics of Lake Juam was surveyed from June 1993 to May 1994 in order to provides important information regarding water resources. Seschi disc transparency, epilimnetic chlorophyll a(chl-a), tatal nitrogen(TN), total phosphorus(TP) concentration and primary productivity were in the range of 2.0~4.5 m, 0.9~13.6 mgChl/㎥, 0.78~2.32N/l, 11~56 mgP/㎥, 270~2,160mgCm^(-2)day^(-1), respectively. On the basis of TP, Chl-a and Secchi disc depth, the trophic state of Lake Juam can be classified as mesotrophic lake. The phosphorus inputs from non-point sources are concentrated in heavy rain episodes during the monsoon season. As a result, phosphorus concentration are higher in summer than in winter. TP loading from the watershed were estimated to be 0.9 gPm^(-2)yr(-1), which correspond to a boundary of the critical loading (1.0 gPm^(-2)yr(-1), which correspond to a boundary of the critical loading (1.0 gPm^(-2)yr(-1)) for eutrophication. From the results of the algal assay, both phosphous and nitrogen act as limiting nutrients in algal growth. The seasonal succession of phytoplankton community structure in Lake Juam was similar to that observed in other temperate lakes. Diatoms(Asterionella formosa and Aulacoseira granulata var. angustissima) were dominant in spring and winter, cyanobacteria (Microcystis aeruginosa, M. sp. and M. viridis) were dominant in warm season. The organic carbon, nitrogen and phosphorus content of lake sediment were 9.5~14.0 mgC/g, 1.01~1.82 mgN/g, and 0.51~0.65 mgP/g, respectively. The allochthonous organic carbon loading from the watershed and autochthonous organic carbon loading by primary production of phytoplankton were determined to be 1,122 tC/yr and 6,718 tC/yr, respectively. To prevent eutrophication of Lake Juam, nutrient management of watershed should be focus on reduction of fertilizer application, proper treatment of manure, and conservation of topsoil as well as point source.

국내 주요호수의 육수학적 조사 (1) : 옥정호

김범철,박주현,이병진,허우명,황길순,최광순,채기숙 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-

The limnological survey of Lake Okjong was conducted for one year from June 1993 to May 1994 on the monthly basis. The loading of phosphorus, nitrogen and organic carbon from the watershed into the lake were monitored at the main in flowing sites. Secchi disc transparency , epilimnetic chlorophyll a, total nitrogen, total phosphorus concentration and primary production were in the range of 1.3~4.H m, 2.4~ 18.7 mg Chl/m³. 1.25~2.87 mg N/l, 7~65 mg P/m³, 325~2,113 mg C/m²/day, respectively. TN/Tl atomic ratio varled from 129 to 443. N/P ratio decreased in summer because phosphorus concentration was higher than in winter, while nitrogen did not vary much. The seasonal succession of phytoplankton was distinct. In winter and spring, diatoms, Aulacoseira granulata var. angustissima and Aulacoseira italica were dominant while cyanobacteria, Microcystis sp.,M. ichthyovlabe, Phormidium sp. and P.valderianum var. tenuis were dominant in warm seasons. The dominant zooplankton species were Thertmocyclops taihokuensis in warm seasons while Boosmina longirostris were dominant in cold seasons. The organic carbon, nirtogen and phosphorus content of lake sediment were 8.0~14.8, 0.59~0.71, 1.14~1.87 ng N/g, respectively. The sediment of Lake Okjong can be classified as oligohumic based on C/N ratio. The total phosphorus loading from the watershed and fishfarm were estimated to be 2.7g P/m²/yr, which far exceeded the critical loading for eutrophication. The organic carbon loading from the watershed and primary production were determined to be 998t C/yr, 6,348t C/yr, respectively. Most of organic carbon was contributed by autochthonous primary production of phytoplankton. Trophic state of Lake Okjong can be classified as eutrophic

Output Inductor Less Phase Shift Full Bridge Converter with Current Stress Reduction Technique for Server Power Application

Woo-Jin Lee,Ki-Bum Park,Tae-Won Heo,Gun-Woo Moon 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-

A new output inductor less phase shift full bridge converter with current reduction technique for server power application is proposed in this paper. The proposed converter can reduce the current stress by using the auxiliary circuit. Since the auxiliary circuit causes the additional resonance between the leakage inductor and auxiliary capacitor before the powering period, the proposed converter has lower current stress even no output filter inductor. Small size and circulating energy can be also the merits of the proposed converter. The operational principles and analysis are presented. Experimental results demonstrate that the current stress can be reduced effectively by using the auxiliary circuit without large output filter inductor.

Effects of intergenerational host plant alterations on developmental parameters of Spodoptera frugiperda (Lepidoptera: Noctuidae)

Woo Heo Jin,Kim Su Bin,김동순 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.3

The fall armyworm (FAW), Spodoptera frugiperda (Smith), is known as a destructive moth pest of agricultural crops such as corn, rice, and sorghum. Recently, its damage threatens crops in Asian temperate regions due to its high migration ability. Two genetic types of FAW, a corn strain mostly found on corn and a rice strain associated with rice, have been reported. The objective of this study was to evaluate whether migrated corn-collected population of FAW could maintain its population on various seasonal plants including non-preferred Poaceae plants, with special emphasis on Jeju, Korea. Development-related parameters were compared after switching host plants including corn (C), Sudan grass (S), proso millet (M), and rye (R) when rearing FAW. Most devel opmental parameters showed dynamic changes according to sequential alternation of host plants with the progress of generations. When all R 0 (net reproductive rate) values were scaled by the R 0 in C to C alteration, the scaled values of other alterations were less than “1.0”, indicating less fitness than C to C alteration (R 0 value: 0.57 for C to S, 0.49 for C to M in F3 generation; 0.82 for S to S, 0.65 for S to M, and 0.58 for S to C in F4 generation, 0.50 for M to M, 0.59 for M to R, and 0.83 for M to C in F5 generation). Although our results did not show that S. frugiperda adapted perfectively on new host plants, this pest was able to successfully reproduce up to five generations with non-preferred host plants. Results indicate that winter crops such as rye might be hosts for migrated corn-preferred populations of S. frugiperda during winter after breeding three to four cycles on other host plants before winter if weather condition is allowed for its survival.

Development of Spodoptera frugiperda population model modified by flight activity with its field validation

Jin Woo Heo,Hyeon Suk Jo,Subin Kim,Dong-soon Kim 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.04