피톤치드 처리 후 구강 내 잔존 S. thermophilus의 P. gingivalis에 대한 효과

정성희,어규식,전양현,홍정표,Jung, Sung-Hee,Auh, Q-Schick,Chun, Yang-Hyun,Hong, Jung-Pyo 대한안면통증구강내과학회 2009 Journal of Oral Medicine and Pain Vol.34 No.1

The antibacterial effect of phytoncide on Porphyromonas gingivalis, which is the main causative agent of periodontal disease and halitosis, has been reported. However, little is known about its effect on normal oral microflora. The present study was performed to observe the effect of phytoncide on oral normal microflora and the inhibitory effect of surviving resident oral bacteria on P. gingivalis. In this study, saliva from each of 20 healthy subjects was treated with 1% phytoncide from Japanese Hinoki (Chamaecyparis obtusa Sieb. et Zucc.). Surviving salivary bacteria were isolated on blood agar plates and identified by 16S rDNA sequencing. In order to select inhibitory isolates against P. gingivalis, the isolates from the phytoncide-treated saliva were cultured with P. gingivalis. The results were as follows: 1. In general, the number of bacteria in saliva from periodontally healthy subjects was decreased when the saliva was treated with 1% phytoncide. 2. The majority of the salivary bacteria surviving the treatment of phytoncide were S. thermophilus (53%). 3. Most of the surviving salivary bacteria (72.5%) inhibit the growth of P. gingivalis A7A1-28 and P. gingivalis W83 on blood agar plates. 4. Among the surviving S. thermophilus, 85.8% of them were observed to inhibit P. gingivalis strains and 75.8% of the surviving S. sanguinis were inhibitory. Taken together, oral resident bacteria surviving phytoncide, which has been shown to inhibit P. gingivalis, may exert an additional inhibitory activity against the periodontopathic bacterium. Therefore, phytoncide can be used for preventing and ceasing the progress of periodontal disease and halitosis, and thus is expect to promote oral health.

방광 전이를 보인 진행 위암 1예

정성희,정훈용,김태원,김청수,강경훈,송현순,황창연,명승재,양석균,홍원선,김진호,민영일,Jung Sung-Hee,Jung Hwoon-Yong,Kim Tae Won,Kim Chung Su,Kang Gyung Hoon,Song Hyun Sun,Hwang Chang Yeon,Myung Seung-Jae,Yang Suk-Kyun,Hong Weon-Seon,Kim J 대한위암학회 2002 대한위암학회지 Vol.2 No.1

Carcinomas of the stomach can spread to adjacent structure by local extension or metastasize to lymph nodes, peritoneum and distant organs. However, the incidence of metastatic bladder cancer originated at the stomach is very rare. A fifty-five year-old man admitted complaining of epigastric pain for 2 months. A large ulceroinfiltrative lesion was seen in the low body, which was confirmed poorly differentiated adenocarcinoma by histological examination. Abdominopelvic CT scan showed wall thickening at the greater curvature side of gastric body and urinary bladder. Urine cytology was negative. By transurethral resection of bladder, he was diagnosed as metastatic adenocarcinoma of the bladder. We report a case of stomach cancer with metastasis to urinry bladder.

랜덤 포레스트를 이용한 X-선 혈관조영영상에서의 혈관 자동 영역화 알고리즘

정성희,이수찬,심학준,정호엽,허용석,장혁재,Jung, Sunghee,Lee, Soochahn,Shim, Hackjoon,Jung, Ho Yub,Heo, Yong Seok,Chang, Hyuk-Jae 대한의용생체공학회 2015 의공학회지 Vol.36 No.4

The purpose of this study is to develop an automatic algorithm for vessel segmentation in X-Ray angiogram using Random Forest (RF). The proposed algorithm is composed of the following steps: First, the multiscale hessian-based filtering is performed in order to enhance the vessel structure. Second, eigenvalues and eigenvectors of hessian matrix are used to learn the RF classifier as feature vectors. Finally, we can get the result through the trained RF. We evaluated the similarity between the result of proposed algorithm and the manual segmentation using 349 frames, and compared with the results of the following two methods: Frangi et al. and Krissian et al. According to the experimental results, the proposed algorithm showed high similarity compared to other two methods.

한국 서울 식생의 번성자로서 팥배나무의 형질 변화 양상

정성희 ( Song-hie Jung ),조용찬 ( Yong-chan Cho ),이창석 ( Chang-seok Lee ) 한국환경생태학회 2021 한국환경생태학회지 Vol.35 No.6

도시 생태계에서 우점 수종의 형질 특성은 분획화 및 고립된 식생, 그리고 생물상호작용 감소 등 환경 변화에 대한 종의 형질 적응과 생태계 기능에 대한 통찰력을 제공한다. 우리는 한국의 서울 중심에서 남쪽 방향의 4개 산지에서 환경 요인 (지리, 기상 및 토양 속성)을 포함하여 모두 40개체 팥배나무 (Sorbus alnifolia)에서 측정한 4개 유형의 잎 형질 (Leaf area, Specific leaf area, Leaf dry mass content, Leaf shape index)과 7개 유형의 번식 형질 (Fruit width, Fruit length, Fruit shape, Fruit dry weight, Fruit dry matter content, Seed weight 및 Seed ratio)의 평균과 분산 양상, 그리고 형질 조합에 대한 다변량 분석을 실시하였다. 측정된 환경 요인은 조사 장소의 개별성을 나타내었지만, 도심 식생이 더 건조하고 생장도일이 길었다. 도심에서 팥배나무의 잎은 작고 무거워지며, 열매는 길쭉하고 가벼운 종자를 생산하여, 오랜 도시화 영향에 따른 형질 반응들이 관찰되었다. 우리의 연구는 식생 파편화 및 고립화에 따른 생물 상호작용 감소를 나타내는 도심 환경에서 팥배나무 집단의 성장 및 번식 기제의 변화를 확인하였다. 우리는 축소된 생물 상호작용 규모, 그리고 대기 오염 같은 부정적 환경 요인이 많은 도시에서 핵심 수종의 기능과 지속성에 관해 제한적이지만 뚜렷한 생태 정보를 제공한다. Understanding the functional traits of dominant species in urban ecosystems provides insight into species' trait adaptation and ecosystem function in response to fragmented and isolated urban vegetation and reduced biological interactions. This study compared means and variances of environmental factors (geographic, meteorological, and soil attributes) and 4 leaf traits (leaf area, specific leaf area, leaf dry mass content, and leaf shape index) and 7 reproductive traits (fruit width, fruit length, fruit shape, fruit dry weight, fruit dry matter content, seed weight, and seed ratio) measured of 40 Sorbus alnifolia individuals in four mountainous areas south of Seoul downtown, South Korea. We then performed the multivariate analysis of trait combinations. While the measured environmental factors indicated the individuality of the survey sites, the urban vegetation was drier and had a longer growth period. The leaves of S. alnifolia in the urban areas were smaller and heavier, and the fruits produced longer and lighter seeds, showing the traits affected by long urbanization. The study confirmed changes in the growth and reproduction mechanism of the S. alnifolia population under the urban environment, indicating reduced biological interaction due to vegetation fragmentation and isolation. This study provides limited but distinct ecological information about the function and persistence of key species in cities with a reduced scale of biological interactions and many negative environmental factors such as air pollution.

기질 특이성 측정에 의한 융합효소의 활성중심 변화 예측

정성희(Sung Hee Jung),김숙현(Sook Hyun Kim),강용호(Yong Ho Khang) 영남대학교 자원문제연구소 2001 資源問題硏究 Vol.20 No.-

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방사성동위원소 추적자를 이용한 침적형 고정 미생물 반응조 진단

정성희(Sung Hee Jung),진준하(Joon Ha Jin),이면주(Myun Joo Lee) 大韓環境工學會 2000 대한환경공학회지 Vol.22 No.6

네트워크 부하에 적응하는 실시간 동영상 서버의 프레임 생략 정책

정성희(Sunghee Jung),함경수(Kyungsoo Ham) 한국정보과학회 1997 한국정보과학회 학술발표논문집 Vol.24 No.1A

MPEG을 이용하는 실시간 서비스는 네트워크상에 다량의 통신부하를 발생시킨다. 기존 연구의 피이드백 메커니즘은 클라이언트의 피드백 정보 전송 및 서버에 의한 재생되지 못할 프레임의 전송에 의하여 통신량이 가증되는 단점이 있다. 본 논문에서는 동영상 서버가 네트워크 부하에 따라 능동적으로 프레임을 생략시킨다. 네트워크의 부하를 줄이고 프레임 손실률을 감소시키기 위하여, 네트워크상에 네트워크 모니터를 설치하고 통신부하를 실시간 측정하여 동영상 서버의 능동적 프레임 생략에 이용하는 실시간 동영상 서버를 구축하고 실험하였다. 실험 결과 본 논문의 서버에 의한 프레임 생략 정책은 피이드백 메커니즘 보다 프레임 손실률이 20%정도 낮아지는 결과를 보인다.

한국 하천의 구간 별 특성과 생태적 복원을 실현하기 위한 대조식생 정보

정성희 ( Jung Song Hie ),김아름 ( Kim Areum ),설재원 ( Seol Jaewon ),임봉순 ( Lim Bong Soon ),이창석 ( Lee Chang Seok ) 한국물환경학회(구 한국수질보전학회) 2018 한국물환경학회지 Vol.34 No.5

To realize river restoration that ecological characteristics of the river are reflected, we classified the river into four reaches of valley stream, upstream, midstream, and downstream based on substrate as well as riverbed gradient obtained from the relationship between distance from the river mouth, and above sea level. Considering that the rivers of Korea have been dominated by various and intense artificial interferences over a lengthy period, we determined cross sectional range of the river based on the geological map and clarified transformation degree by reach. Vegetation profile diagram was prepared by depicting horizontal range and vertical stratification of major vegetation appearing in a belt transect of 10 m breadth installed between weirs constructed in both sides of the river. Restoration models by river reach were prepared based on breadth of waterway, bare ground, herb, shrub, and tree dominated vegetation zones on vegetation profiles wherein a flooding regime was reflected. Species composition information collected from vegetation established in each zone was systematized to use for restoring each reach ecologically. Further, background that longitudinal reaches and horizontal zones were divided, was discussed by comparing with case studies in foreign countries. In addition, necessity of ecological restoration of the river was discussed based on degree of integrity of Korean rivers, ecological significance of riparian vegetation, and importance of reference information for ecological restoration of the river.

제주도 동백동산에 성립된 습지의 유형과 식생

정성희(Jung, Songhie),임봉순(Yim, Bong Soon),조용찬(Cho, Yong Chan),김진석(Kim, Jin-Seok),이창석(Lee, Chang Seok) 한국습지학회 2018 한국습지학회지 Vol.20 No.3

Wetlands of Dongbaekdongsan were classified into two types of pond and vernal pool. 11 plant communities are established there such as Nymphoides indica community, Sparganium stoloniferum Community, Persicaria hastato-auriculata community, Scirpus triangulatus community, Triadenum japonica community, Juncus papillosus community, Deinostema violacea community, Centipeda minima community, Apocynum sibiricum community, Isachne globosa community, and Ulmus parvifolia community. Nymphoides indica community is established in a pond located on the entrance of the Dongbaekdongsan and Persicaria hastatoauriculata community appears on edge of the pond. Sparganium stoloniferum community is formed in nearby pond with relatively shallow water and Persicaria hastatoauriculata community is established on margin of the pond. Vernal pools had been used for drinking water source and for livestock in some cases in the past. Scirpus triangulatus community is established in the most wet site as the center of the pools and Juncus papillosus community - Deinostema violacea community - Triadenum japonica community, and Apocynum sibiricum community appear in a concentric circle pattern as far away there. Ulmus parvifolia community is established in a dry vernal pool. This is the first study on vernal pool carried out in Korea. Therefore, most vegetation types are new ones different from existing studies on wetland. 동백동산 습지는 못과 한시적 못으로 구분되었다. 어리연꽃군락, 흑삼릉군락, 좁은잎미꾸리낚시군락, 송이고랭이군락, 물고추나물군락, 청비녀골풀군락, 진땅고추풀군락, 중대가리풀군락, 수궁초군락, 기장대풀군락 및 참느릅나무군락의 11개 식물군락이 성립해 있다. 어리연꽃 군락은 동백동산입구에 위치한 한 못에 성립해 있고 좁은잎미꾸리낚시군락은 그 못의 가장자리에 성립해 있다. 흑삼릉군락은 수심이 비교적 낮은 인근의 못에 성립해 있고 그 못의 가장자리에도 좁은잎미꾸리낚시군락이 성립해 있다. 한시적 못은 과거 식수원으로 사용되었고 일부에서는 가축의 물먹이공간으로도 사용되었다. 송이고랭이군락은 그 못의 중심으로서 가장 습한 곳에 성립하고 청비녀골풀군락-진땅고추풀군락-물고추나물군락 및 수궁초군락이 그곳으로부터 멀어짐에 따라 동심원 구조로 성립해 있다. 참느릅나무군락은 상대적으로 더 건조한 한시적 못에 성립해 있다. 본 연구는 한국에서 한시적 못에 대해 처음으로 이루어진 연구이다. 따라서 본 연구에서 밝혀진 대부분의 식생유형은 습지에 대한 기존의 연구와 다른 새로운 유형으로서 그 가치가 있다.

혐기성 슬럿지 소화조의 청소 후 방사성 추적자를 이용한 수리학적 성능 진단

정성희(Sung Hee Jung),김종범(Jong Bum Kim),진준하(Joon Ha Jin) 大韓環境工學會 2001 대한환경공학회지 Vol.23 No.10