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실험적 치아 이동 시 나타나는 백서 치주조직의 변화에 대한 조직학적 및 조직화학적 연구
임진환(Jin-Hwan Lim) 대한치과교정학회 1976 대한치과교정학회지 Vol.6 No.1
For the purpose of evaluating the response of the periodontal tissue in relation to the experimental tooth movement, orthodontic force was applied to 15 female rats. The animals were investigated histopathologically and histochemically by several staining methods. Findings were as follows: 1. The application of 60gm on the rat´s molar caused mesial tipping movement and undermining resorption. 2. One day after the insertion of the appliance, the osteoblast was increased in activity but not in number. 3. The osteoclastic activity was decreased as soon as removing the appliance. 4. With the P.A.S. staining, osteoclasts Stained mildly in the initial stage and stained more intensely in the last stage. Osteoclasts revealed negative reaction in the initial stage and stained mildly in the last stage. 5. Slides stained with toluidine blue revealed no conclusive variations between osteoblasts and osteoclasts.
Anodizing과 Burning 공정 혼합으로 표면처리 된 마그네슘합금(AZ31) 안경테 표면의 특성 연구
유재용,임진환,유재인,김진희,박창훈,김기홍,Yu, Jae-Yong,Lim, Jin-Hwan,Yu, Jae-In,Kim, Jin-Hie,Park, Chang-Hun,Kim, Ki-Hong 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.3
마그네슘 합금을 Anodizing과 Burning anodizing만으로만 표면 처리했을 때는 표면에 기공이 많이 발생 되었지만, anodizing 처리 후, burning 공정을 추가 하였을 때는 기공이 현저히 줄어들었다. 즉 burning 공정이 추가 되므로 인해 anodizing 공정의 단점인 기공의 봉공처리가 가능함을 알았다. 또한 막 두께도 anodizing 만 처리 했을 때 보다 더 균일하게 성장함을 보았다. During the anodizing and burning anodizing process, appreciable amounts of pores were generated on the surface of magnesium (Mg) alloy which deteriorate the quality of the alloy. However, additional burning process subsequent to the anodizing process reduces the density of pores on the surface. We found that additional burning process can increase the quality of Mg alloy. In addition we found that burning process increases homogeneity of the film thickness as well.
n-GaAs 구조에서의 ArF excimer laser annealing에 따른 Photoreflectance 특성 연구
김기홍,유재인,심준형,배인호,임진환,김진희,유재용,Kim, Ki-Hong,Yu, Jae-In,Sim, Jun-Hyoung,Bae, In-Ho,Lim, Jin-Hwan,Kim, Jin-Hi,Yu, Jae-Yong 한국진공학회 2007 Applied Science and Convergence Technology Vol.16 No.2
n-GaAs의 시료를 furnace annealing 처리와 laser annealing 처리를 한 후, PR 방법으로 비교 조사하였다. 시료는 Furnace annealing을 5 분간 $400{\sim}800^{\circ}C$에서 처리한 시료와 ArF excimer laser($30{\sim}50\;W$)로 5 분간 Laser annealing 처리 한 시료로 준비하였다. Furnace로 annealing을 한 경우에 주 신호(정점)는 1.43 eV에서 관측되었는데 비해 laser로 annealing 한 샘플은 1.42 eV로 0.01 eV가 더 작게 관측되었다. 이는 laser annealing이 furnace annealing 보다 표면과 내면에서 일어나는 열처리 효과가 더 고르게 일어나가 때문이다. We investigated variation of the photoreflectance(PR) signals for n-GaAs furnace and laser annealed. The samples were annealed by using ArF excimer laser(5 min, $30{\sim}50\;W$) and furnace(5 min $400{\sim}700^{\circ}C$). The PR signals(top point) measured from the ArF excimer laser annealed sample showed 1.42 eV and furnace annealed sample showed 1.43 eV. This result is ArF excimer laser annealed sample was uniform annealed surface and inter state.
하자심사·분쟁조정위원회 수급인·하수급인 간 분쟁의 특수성
오강환 ( Oh Kang-hwan ),박형민 ( Park Hyeong-min ),임진환 ( Lim Jin-hwan ),홍민지 ( Hong Min-ji ),최진화 ( Choi Jin-wha ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.1
하자심사 · 분쟁조정위원회(이하 “위원회”)는 입주자와 사업주체 사이의 분쟁을 해결하며, 국민의 주거안정 및 공동주택의 품질 향상에 기여해왔다. 입주자가 사업주체에게 보수요청을 하면, 사업주체(수급인)는 하자를 인정한 후, 하자의 종국적 책임이 하수급인에게 있음을 주장하기에 실질적인 분쟁의 주체가 사업주체(수급인)와 하도급업체(하수급인)의 분쟁으로 이어지는 경우가 빈번하다. 이에 따라 2022년 「공동주택관리법」의 개정으로 「건설산업법」의 수급인 · 하수급인 간에 발생하는 분쟁까지 위원회 업무 대상으로 포함되었다. 분쟁 주체에 따른 분쟁사유, 하자담보책임기간, 사실조사, 하자감정 등 차이점을 이해하고 개선사항에 대한 대처가 필요하다.
커피 슬러지 바이오차의 Cu와 Cd 흡착제거 특성 연구
김병문,강창환,양재규,나정균,정종암,정형진,임진환,고경민,김완희,장윤영,Kim, Byung-Moon,Kang, Chang-Hwan,Yang, Jae-Kyu,Na, Jung-Kyun,Jung, Jong-Am,Jung, Hyung-Jin,Lim, Jin-Hwan,Ko, Kyung-Min,Kim, Wan-Hee,Chang, Yoon-Young 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.2
In this study, the adsorption of $Cu^{2+}$ and $Cd^{2+}$ from aqueous solution on the biochar derived from used coffee grounds at different pyrolysis temperatures has been investigated as a potential low-cost treatment method for heavy metal-containing waters. Three biochar samples prepared by heating coffee sludge at temperature of $300^{\circ}C$ (B300), $500^{\circ}C$ (B500), and $700^{\circ}C$ (B700) were tested for the adsorption capacity and kinetics of Cd and Cu. Also the influencing factor of heavy metal removal by ion exchange in terms of cation exchange capacity (CEC) of each biochar was measured. Adsorption of Ca and Cu by biochar produced at higher pyrolysis temperature showed higher adsorption capacity but the optimal pyrolysis temperature based on performance and economy was known as $500^{\circ}C$. Sorption of Cu and Cd by biochar followed a Langmuir model at pH 6~6.5, attributing mainly to surface sorption. The biochar was more effective in Cu and Cd sorption than activated carbon (AC), with BC 500 being the most effective, which indicates that sorption of Cd and Cu by coffee sludge biochar is partly influenced by chemical sorption on surface functional group as well as physical sorption.
마이크로버블 오존 산화제와 공압파쇄 장치를 연계 적용한 지중 화학적 산화법의 정화효율 평가
오승택,오참뜻,김국진,석소희,김철경,임진환,유재봉,장윤영,Oh, Seung-Taek,Oh, Cham-Teut,Kim, Guk-Jin,Seok, So-Hee,Kim, Chul-Kyung,Lim, Jin-Hwan,Ryu, Jae-Bong,Chang, Yoon-Young 한국지하수토양환경학회 2012 지하수토양환경 Vol.17 No.4
A new type of chemical oxidation technology utilizing micro bubble ozone oxidizer and a pneumatic fracturing equipment was developed to enhance field applicability of a traditional chemical oxidation technology using hydrogen peroxide as an oxidizer for in-situ soil remediation. To find an efficient way to dissolve gaseous ozone into hydrogen peroxide, ozone was injected into water as micro bubble form then dissolved ozone concentration and its duration time were measured compared to those of simple aeration of gaseous ozone. As a result, dissolved ozone concentration in water increased by 31% (1.6 ppm ${\rightarrow}$ 2.1 ppm) and elapsed time for which maximum ozone concentration decreased by half lengthened from 9 min to 33 min. When the developed pneumatic fracturing technology was applied in sandy loam, cracks were developed and grown in soil for 5~30 seconds so that the radius of influence got longer by 71% from 392 cm to 671 cm. The remediation system using the micro bubble ozone oxidizer and the pneumatic fracturing equipment for field application was made and demonstrated its remediation efficiency at petroleum contaminated site. The system showed enhanced remediation capacity than the traditional chemical oxidation technology using hydrogen peroxide with reduced remediation time by about 33%.