井水의 微生物學的 水質에 관한 硏究

李建炯 군산대학교 1985 論文集 Vol.10 No.-

Physicochemical and microbiological water qualities of 40 wells located on Okku Gun and Miryong Dong, Kunsan City of Chollabuk Do were examined.The results were as follows; 1.Water temperature and pH were ranged 4.9℃-24℃ and 5.7-8.3 respectively during February to October,1984. 2.The values of dissolved oxygen and biochemical oxygen demand were ranged 2.56-8.55mg/l and 1.0-8.36 mg/l, respectively. 3.The population density of general bacteria was maximized as high as 1.43×104 cell/ml on May, 1984 at Miseong Eup and minimized as low as 2.06×102 cells/l on February, 1984 at Hoehyen-Myon. 4.The population desity of total coliform was ranged 0 - 3.32×103 cells/ml.Maximum density shown on May, but no total coliform was detected on February, 1984. 5.Salmonella & Shigella and Staphylococcus groups grown on selective media were ranged 0-7.47×102 cells/ml, 0-9.2×102 cells/ml, respectively. 6.The water depths of 79% of investigated wells were below 5m, and 52% of wells were 10m from pollutants.

고주파 에너지 절제술로 확인된 중중격 우회로의 전기생리학적 특성

이승환,류종철,김건영,안신기,이문형,김성순 대한순환기학회 1997 Korean Circulation Journal Vol.27 No.7

산림토양내의 병, 해충방제를 위한 생태학적 기초연구 : I.소나무림과 활엽수림내의 지표곤충 1.Soil Surface Insects in Pine Plantation and Oak Forest

이해풍,이건형,김상훈 東國大學校 1989 論文集 Vol.28 No.-

본 연구는 경기도 남양주군 조안면 진중리 소재 동국대학교 연습림의 소나무림과 참나무림 내에서 1987년 5월부터 11월까지 실시되었으며 지표토양곤충군집을 대상으로 종의 구성, 먹이식습성의 구성, 우점종의 구성, 균등도 등이 조사되었다. 조사된 종은 소나무림 내에서 41과 94속 128종으로 확인되었으며 종의 수가 많은 것으로는 딱정벌레목, 벌목, 톡톡히목 그리고 파리목이었고 참나무림의 경우는 46과 95속 135종이었으며 딱정벌레목, 벌목, 톡톡히목 그리고 파리목 순으로 종수가 많았다. 식습성에 따른 영양관계구성은 초식성의 것이 두 지역 모두 가장 많아 소나무팀에서는 전체 절지동물중 43.6%이었고 다음으로 검류를 포함한 포식충류가 37.2% 그리고 잡식성인 것이 19.0%이었다. 한편 참나무림에서는 각각 36.8%, 47.8% 그리고 15.3%를 나타내어 전체적으로는 종의 다양도에서 소나무림이 약간 높았을 뿐 뚜렷한 차이를 볼 수 없었다. 계절별 군집의 변화동태에서는 두 지역간 약간의 차이를 보여서 포식자의 발생밀도가 참나무림에서 9월 중순에 대조적으로 높았을 뿐 큰 차이없이 전체적으로 5-7월에 높았고 9-10월에 낮았다. During the period from May, 1987, to November, 1987, (on the basis of pitfall trap capture,) 128 species and 135 species of insects together with unidentified were collected in soil surface of Pine plantation and Oak forest respectively in Kyounggi-Do. Spiders were most abundant species group, comprising 22.6% of the total number of individuals in Pine plantation. the most abundant insect groups were Coleoptera, Hymenoptera, Collembola and Diptera in Pine plantation, and Coleopteram Hymenoptera and Diptera in Oak forest. Oak forest supported more species than Pine plantation which supported only 4 species at very high population levels and the rest at low levels. Many of the species in two study areas were either general plant feeders or predators. Seasonal abundance of the total insects including spiders was high in the periods of May to July and low in Nomber.

수계환경에서 분변성 오염의 지표로 사용되는 미생물들

이건형 한국환경생물학회 2002 환경생물 : 환경생물학회지 Vol.20 No.3

The direct detection of intestinal pathogens and viruses often requires costly, tedious, and time-consuming procedures. These requirements developed a test to show that the water was contaminated with sewage-borne pathogens by assessing the hygienic quality of water based on indicator microorganisms whose presence indicates that pathogenic microorganisms may also be present. Various groups of microorganisms have been suggested and used as indicator microorganisms. Proposed and commonly used microbial indicators are total coliforms, fecal coliforms, fecal streptococci, Clostridium perfringens, heterotrophic plate count, bacteriophage, and so on. Unfortunately, most, if not all, of these indicators are not ideal because of the sensitivity and resistance to environment stresses and disinfection. However, the development of gene probes and PCR technology may give hope for the discovery of rapid and simple methods for detecting small number of fecal pathogens in various environments.

소흑산도의 토양미생물과 해양미생물의 환경적 분포

임병선,이오형,이건형 木浦大學校沿岸生物硏究所 1988 沿岸生物硏究 Vol.5 No.1

The physicochemical properties of soil and the distributions of both soil and marine marine microorganisms of Sohuksan-do, Chonnam were investigated on 22th of May, 1988. The results were as follows: 1. The physicochemical properties of soil 5. investigated sites revealed their pH values ranged 5.0-5.9(mean, 5.52). The values of electroconductivity, organic matter, total nitrogen, and water content were in the range of 140-190 ㎛ho/㎝ , 9.8-18.8%, 1.25-3.62㎎/g , and 27.2-46.5%, respectively. 2. Distribution of soil microbes The total count of bacteria, fungi, and actinomycetes were in the range of 3.0 -8.8 ×10??cells/g soil, 0.7-1.5 ×10??cells/g soil, and 2.0-2.8 ×10?? cells/g soil, respectively. Bacteria occupied about 64.2% of total population, and fungi 9.9%, actinomycetes 26.0%, respectively. Of the total count of each group, cellulolytic bacteria occupied about 13.7% of total bacteria, and celulolytic fungi, about 49.8%, cellulolytic acvtino-mycetes, about 12.2%, respectively. It was worth noting that cellulolytic fungi occupied a large proportion of the total count of fungi, meaning active progress of cellulose decomposition in this area. 3. Distribution of marine microbes The popolarion density of marine bacteria was found to be in the range of 1.07 -4.77 ×10??cells/㎖ at the surface layer, 1.02-7.77 ×10??cells/㎖ in the middle layer, and 2.53 6.58 ×10??cells/㎖ at the bottom layer, respectively. These results showed tendency of higher density at the euphotic zone. In caseof physiologically characteristic bacteria, the population density of proteolytic bacteria was higher than that of either lipolytic or amylolytic bacteria, meaning independence of this area from incorporation of nutrients from outside.

A Case of a Common Bile Duct Stone Caused by a Long Plant Spine in a Patient Who Underwent Subtotal Gastrectomy and Endoscopic Sphincterotomy

Won Min Kim · Hyoung Eun Baek · Seung Hyoung Lee · Gwang Ok Lee · Seung Ho Choi · Jong Hoon Lee · Geum Soo Lee · Hyoung Cheol Moon · Sang Wook Park · Geon Young Hong 조선대학교 의학연구원 2012 The Medical Journal of Chosun University Vol.37 No.2

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Edge-Limited Valley-Preserved Transport in Quasi-1D Constriction of Bilayer Graphene

Lee, Hyunwoo,Park, Geon-Hyoung,Park, Jinho,Lee, Gil-Ho,Watanabe, Kenji,Taniguchi, Takashi,Lee, Hu-Jong American Chemical Society 2018 NANO LETTERS Vol.18 No.9

<P>We investigated the quantization of the conductance of quasi-one-dimensional (quasi-1D) constrictions in high-mobility bilayer graphene (BLG) with different geometrical aspect ratios. Ultrashort (a few tens of nanometers long) constrictions were fabricated by applying an under-cut etching technique. Conductance was quantized in steps of ∼4<I>e</I><SUP>2</SUP>/<I>h</I> (∼2<I>e</I><SUP>2</SUP>/<I>h</I>) in devices with aspect ratios smaller (larger) than 1. We argue that scattering at the edges of a quasi-1D BLG constriction limits the intervalley scattering length, which causes valley-preserved (valley-broken) quantum transport in devices with aspect ratios smaller (larger) than 1. The subband energy levels, analyzed in terms of the bias-voltage and temperature dependences of the quantized conductance, indicated that they corresponded well to the effective channel width of a physically defined conducting channel with a hard-wall confining potential. Our study in ultrashort high-mobility BLG nano constrictions with physically tailored edges clearly confirms that physical edges are the major source of intervalley scattering in graphene in the ballistic limit.</P> [FIG OMISSION]</BR>

Covariant-gauge quantization of gauge theories in the functional Schrodinger picture

Lee, Geon Hyoung,Yee, Jae Hyung 서울대학교 이론물리학연구센터 1993 연구논문집 Vol.2 No.-

Synergistic Effects of a Multifunctional Graphene Based Interlayer on Electrochemical Behavior and Structural Stability

Lee, Young-Woo,An, Geon-Hyoung,Kim, Byung-Sung,Hong, John,Pak, Sangyeon,Lee, Eun-Hwan,Cho, Yuljae,Lee, Juwon,Giraud, Paul,Cha, Seung Nam,Ahn, Hyo-Jin,Sohn, Jung Inn,Kim, Jong Min American Chemical Society 2016 ACS APPLIED MATERIALS & INTERFACES Vol.8 No.27

<P>The ability to rationally design and manipulate the interfacial structure in lithium ion batteries (LIBs) is of utmost technological importance for achieving desired performance requirements as it provides synergistic effects to the electrochemical properties and cycling stability of electrode materials. However, despite considerable efforts and progress made in recent years through the interface engineering based on active electrode materials, relatively little attention has been devoted to address the physical aspects of the interface and interfacial layer between the anode materials layer and the current collector. Here, we propose and successfully grow unique graphene directly on a Cu current collector as an ideal interfacial layer using the modified chemical vapor deposition (CVD). The anode with an engineered graphene interlayer exhibits remarkably improved electrochemical performances, such as large reversible specific capacity (921.4 mAh g(-1) at current density of 200 mA CI), excellent Coulombic efficiency (close to approximately 96%), and superior cycling capacity retention and rate properties compared to the bare Cu. These excellentelectrochemical features are discussed in terms of multiple beneficial effects of graphene on interfacial stability and adhesion between the anode and the collector, oxidation or corrosion resistance of the graphene grown Cu current collector, and electrical contact conductance during the charge/discharge process.</P>

Transfer and Survival of Genes Resistant to Antibiotics in Soil

Lee, Geon-Hyoung,Lee, Jae-Sei The Ecological Society of Korea 1994 Journal of Ecology and Environment Vol.17 No.2

The transfer of plasmid-borne genes coding for resistance to antibiotics (Ampicillin, Carbenicillin, and tetracycline) among 16 strains isolated from Mankyong River was examined. The survival of donors, recipient, and transformants in sterile and nonsterile soil (the soil was amended with 12% vol/vol with the clay mineral, montmorillonite) was also studied. In sterile soil, the survival was prolonged in the order of donors, transformants, and recipient. The survival of donors, transformants, and recipient increased when the soil was amended with 12% montmorillonite, but not in nonsterile soil. In nonsterile soil, donors survived longer than transformants and recipient, but the survival of transformants and recipient showed no significant differences. The results of these studies suggest that genes can be transferred by transformation, and transferred genes can survive in soil for a considerable time.