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연구논문 : 베트남 Kon Tum 지역에서의 산림훼손지역 예측을 통한 REDD 적지 분석
( Riwako Tanaka ),이동근 ( Dong Kun Lee ),정태용 ( Tae Yong Jung ),류지은 ( Ji Eun Ryu ) 한국환경영향평가학회 2013 환경영향평가 Vol.22 No.6
UNFCCC(United Nations Framework Convention on Climate Change) agreed with Reducing emissions from deforestation and forest degradation(REDD). It is necessary to develop the method of REDD suitability assessment in national scale. Existing researches suggested projection methods of deforestation area by many deforestation factors, but the causes of deforestation were different by regions. Therefore, in this study, REDD suitability in Kon Tum province in Vietnam was analyzed by several significant deforestation factors. REDD suitability value was computed using the Fuzzy set. As a result, all deforestation factors related to deforestation area and the REDD suitability value was the highest in Sa Thay district, Dak Glei district, Kon Plong district and Dak Ha district. These provinces have high biodiversity, on the other hand deforestation problem has been occurred.
균열 암반에서의 HydroDFN 모델 해석을 이용한 등가블록투수계수의 계산
김형목(Hyung-Mok KIM),류동우(Dong-Woo RYU),박의섭(Eui-Seop PARK),신희순(Hee-Soon SHIN),田中達也(Tatsuya TANAKA) 한국암반공학회 2007 터널과지하공간 Vol.17 No.3
본 연구에서는 시추공 조사 결과를 바탕으로 수리지질학적 모델 구축과정에 요구되는 해석과정의 체계화 및 고도화의 일환으로 균열 암반에서의 조사 시추공을 통해 얻어진 균열 정보로부터 지하수 유동경로를 제공하는 구조 (Water Conducting Feature, WCF)를 선별하고, 선별된 WCF 정보를 이용하여 HydroDFN 모델을 구축하였다. HydroDFN 모델 내부를 세분한 정육면체 블록에서의 등가투수계수를 계산하고, 계산된 등가블록 투수계수는 시추공 투수시험 결과와 비교함으로써 구축된 HydroDFN 모델의 검증에 이용하였다. 이러한 해석과정을 통해 투수량 계수 등으로 대표되는 WCF 파라미터의 설정 및 수리지질학적 모델 구축시의 효과적인 방안을 제안하였다. In this paper, it was aimed to enhance core processes required in establishing hydrogeological models constructed using borehole investigation results. Water Conducting Feature (WCF) information was extracted from borehole investigation, and HydroDFN model was constructed based on the WCF information. The HydroDFN model was sub-divided by cubic blocks, and equivalent permeability of each sub-divided block was calculated and compared with the results of hydraulic test at the borehole. Through these analysis processes, suggestion for identifying and prescribing WCF parameters in the construction of HydroDFN model was made.
Fumiaki Ishibashi,Konomi Kobayashi,Keita Fukushima,Ryu Tanaka,Tomohiro Kawakami,Junko Kato,Kazuaki Sugihara 대한소화기내시경학회 2020 Clinical Endoscopy Vol.53 No.6
Background/Aims: While Helicobacter pylori (HP)-negative gastric cancer is frequently reported, little is known about the predictors for detecting HP-negative early gastric cancer (EGC). We aimed to evaluate the predictors for the detection of HP-negative EGC. Methods: We retrospectively reviewed 13,477 consecutive asymptomatic cases where upper endoscopy was performed by nine physicians from April 2017 to March 2019 and analyzed the detection rate of high-risk lesions (HRLs), including EGC, tubular adenoma, and lymphoma, according to the status of HP infection. The observation time was corrected for multiple regression analyses. Results: For all physicians, the average observation time for screening HP-eradicated and -naïve patients was shorter than that for screening HP-positive patients (p<0.05). Multiple regression analyses revealed that the observation time in the three groups was an independent predictor for detecting HRLs in HP-eradicated patients (p=0.03106, 0.01263, and 0.02485, respectively), while experience of endoscopy was an independent predictor for detecting HRLs in HP-naïve patients (p=0.02638). Conclusions: While observation time during screening endoscopy was a quality indicator for detecting HRLs in HP-eradicated patients, experience of endoscopy was a quality indicator for detecting HRLs in HP-naïve patients.
Fumiaki Ishibashi,Keita Fukushima,Takashi Ito,Konomi Kobayashi,Ryu Tanaka,Ryoichi Onizuka 대한위암학회 2019 Journal of gastric cancer Vol.19 No.2
Purpose: Gastric adenocarcinoma of the fundic gland type (chief cell predominant type) (GA-FG-CCP) was first reported as a rare adenocarcinoma found in the normal fundic mucosa. Recent studies have proposed the possibility that GA-FG-CCPs were also generated in the atrophic mucosa after Helicobacter pylori (HP) eradication therapy. However, little is known on the endoscopic findings of GA-FG-CCP generated in the atrophic mucosa due to its extreme rarity. Materials and Methods: A total of 8 patients who underwent endoscopic submucosal resection and were diagnosed with GA-FG-CCP generated in the HP-uninfected mucosa (4 cases, HP-uninfected group) or HP-eradicated atrophic mucosa (4 cases, HP-eradicated group) were retrospectively analyzed, and their endoscopic findings, including magnifying endoscopy with narrow band imaging (M-NBI), and pathological features were compared. Results: While GA-FG-CCPs in the 2 groups displayed similar macroscopic appearance, M-NBI demonstrated that characteristic microvessels (tapered microvessels like withered branches) were specifically identified in the HP-eradicated group. Pathological investigation revealed that a decreasing number of fundic glands and thinned foveolar epithelium covering tumor ducts were thought to lower the thickness of the covering layer over tumor ducts in the HP-eradicated group. Moreover, dilation of vessels just under the surface of the lesions contributed to the visualization of microvessels by M-NBI. Conclusions: The change in background mucosa due to HP infection influenced the thickness of the covering layer over the tumor ducts and M-NBI finding of GA-FG-CCP.
( Jong Hwan Kim ),( Dae Sung Kim ),( Hisayuki Suematsu ),( Kenta Tanaka ),( Bong Ki Ryu ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.1
We used Sn-58Bi and Cu wires to investigate the effects of variable conditions (such as pressure and wire diameter) on the formation of three-component nanoparticles. In the synthesis of the three-component nanoparticles, pulsed wire discharge was used to sublimate the wires. In this system, the K factor is described as E<sub>c</sub>/E<sub>s</sub>, where E<sub>c</sub> and E<sub>s</sub> are respectively the applied energy and the sublimation energy of the system. Experiments were conducted in a N<sub>2</sub> atmosphere using the following parameters: voltage of 6 kV, pressure of 50-100 kPa, and Cu wire diameters of 0.1 and 0.2 mm. X-ray diffraction and field emission scanning electron microscopy were employed for structural analysis, particle size distribution analysis, collection rate, and composition studies of the nanoparticles. (Received May 4, 2016; Accepted July 12, 2016)
Ishibashi, Fumiaki,Fukushima, Keita,Ito, Takashi,Kobayashi, Konomi,Tanaka, Ryu,Onizuka, Ryoichi The Korean Gastric Cancer Association 2019 Journal of gastric cancer Vol.19 No.2
Purpose: Gastric adenocarcinoma of the fundic gland type (chief cell predominant type) (GA-FG-CCP) was first reported as a rare adenocarcinoma found in the normal fundic mucosa. Recent studies have proposed the possibility that GA-FG-CCPs were also generated in the atrophic mucosa after Helicobacter pylori (HP) eradication therapy. However, little is known on the endoscopic findings of GA-FG-CCP generated in the atrophic mucosa due to its extreme rarity. Materials and Methods: A total of 8 patients who underwent endoscopic submucosal resection and were diagnosed with GA-FG-CCP generated in the HP-uninfected mucosa (4 cases, HP-uninfected group) or HP-eradicated atrophic mucosa (4 cases, HP-eradicated group) were retrospectively analyzed, and their endoscopic findings, including magnifying endoscopy with narrow band imaging (M-NBI), and pathological features were compared. Results: While GA-FG-CCPs in the 2 groups displayed similar macroscopic appearance, M-NBI demonstrated that characteristic microvessels (tapered microvessels like withered branches) were specifically identified in the HP-eradicated group. Pathological investigation revealed that a decreasing number of fundic glands and thinned foveolar epithelium covering tumor ducts were thought to lower the thickness of the covering layer over tumor ducts in the HP-eradicated group. Moreover, dilation of vessels just under the surface of the lesions contributed to the visualization of microvessels by M-NBI. Conclusions: The change in background mucosa due to HP infection influenced the thickness of the covering layer over the tumor ducts and M-NBI finding of GA-FG-CCP.
Kim, Dae Sung,Kim, Jong Hwan,Suematsu, Hisayuki,Tanaka, Kenta,Ryu, Bong Ki American Scientific Publishers 2017 Journal of Nanoscience and Nanotechnology Vol.17 No.10
<P>Nanoscale compound powders of Sn-Bi-Cu were successfully synthesized using pulsed wire discharge (PWD). Sn-Bi-Cu powder is used Pb-free soldering materials at low temperature. When the particle size of the Sn-Bi-Cu synthesized as nano-scale has the advantage of lowering the melting point, improving wettability, and stabilizing reaction interface. In PWD, when a high current is passed through high-density metal wires, the wire explodes because of resistance heating, which forms fine particles or metal vapor. We used two wires, Sn-Bi alloy wires and Cu wires, to obtain three-component nanopowders. A high current was applied to the wires between the electrodes in a N-2 atmosphere. We discuss the results based on the K factor, which is E-C/E-V, where E-C and E-V are the charging energy of the capacitor and the vaporization energy of the wire, respectively. Nanoparticles with three components, Sn-Bi-Cu, were synthesized under N-2 atmosphere at voltages of 4/6 kV. According to the particle-size distributions, the mean particle diameter of the prepared Sn-Bi and Cu nanopowders was 14.56-40.36 nm for each condition. In this study, We successfully three-component nanopowders synthesized and subjected two wires to extreme energies by the PWD method to form a nanopowder by overcoming its limited solid solubility.</P>