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Insulation Coating of Fe–Si–Cr Soft Magnetic Powder by Selective Oxidation
Jae‑Young Park,Kwangsuk Park,Bosung Seo,Julien O. Fadonougbo,Tae‑Wook Na,Ki Beom Park,Hyeon‑Tae Im,Nong‑Moon Hwang,Hyung‑Ki Park 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
This study examines the insulation coating technology of Fe–Si–Cr powder via selective oxidation annealing, which oxidizeselements selectively by controlling the oxidation potential. The study calculated the oxidation driving force of Fe, Si, andCr, and conducted a thermodynamic analysis of oxidation and reduction conditions according to temperature and oxidationpotential. Based on the results, a selective oxidation annealing was performed in an atmosphere in which Fe is reduced andonly Si and Cr are selectively oxidized. The oxidation potential was controlled through the partial pressure ratio of hydrogenand water vapor. The XPS analysis results confirmed that a Si and Cr complex oxide layer formed on the powder surfaceafter the selective oxidation annealing. Afterward, withstanding voltages were analyzed to evaluate the insulation property. Then, the withstanding voltage of the powder applying the selective oxidation annealing increased significantly comparedto that of the initial powder. Further analysis showed that the powder annealed in an air atmosphere had a significantly lowersaturation magnetic flux density than the initial powder, while the powder applying the selective oxidation annealing hadonly a slightly reduced saturation magnetic flux density.
박재현,김승철,한창훈,박종오,임영도 東亞大學校 附設 情報通信硏究所 1998 情報通信硏究所論文誌 Vol.6 No.1
In a case of driving beginnners, it is very difficult to park a car perfectly because driver's knowledge makes more errors than intelligent mechanism when they are performed repeatedly. However skilled drivers be of experienced knowledge are able to park a car quickly. In this paper, we analyzed driving patterns of skilled drivers, designed the fuzzy controller to park based on it, and perform auto-parking simulation of a car using that controller.
북한산국립공원 북동사면에서 동결융해침식 및 토사유출이 계류수질에 미치는 영향
박재현(Jae Hyeon Park) 한국산림과학회 2001 한국산림과학회지 Vol.90 No.4
This study was conducted to investigate influences of solifluction and sediment runoff on the stream water qualities during the spring season. The study sites were four points in the northeastern area of the Bukhansan National Park. And, field surveys were carried out in the spring of 1999, 2000 and 2001. The results of this study were summarized as follows; During the investigation period, the amounts of sediment caused by solifluction on stream side slopes in the downstream were 1.3∼1.7 times as large as those in the upstream. The pH of sediment caused by solifluction was a potential influence on the pH of stream water. Amounts of dissolved Cl^-, NO₃^- and SO₄^(2-) in stream water were proportion to the average amounts of Cl^-, NO₃^- and SO₄^(2-) in the sediment caused by solifluction. In the spring, the average pH of stream water was lower than the first class of the river water quality standard because of increasing chemical concentration as well as the contents of anions(Cl^-, NO₃^- and SO₄^(2-)) in the spring season. Also, the average electrical conductivity of water in downstream was about 2.3-3.3 times higher than that in upstream. The amounts of anions(Cl^-, NO₃^- and SO₄^(2-)) of water in downstream were about 1.2∼7.4, 1.1∼3.9, 1.1∼1.4 times higher than those in upstream, respectively. Therefore, these results showed that the water quality of downstream was worse than that of upstream. As a result of regression analyses, the linear and exponential equation of pH and water quantity was pH = 1.7926 × stream water quantity + 5.9577(R² = 0.46), and those of electrical conductivity and water quantity was EC = 34.417e^(3.6334 × stream water quantity(m/sec) (R² = 0.44).
박재현 ( Jae Hyeon Park ) 한국환경보건기술학회(구 한국환경복원녹화기술학회) 2010 한국환경복원기술학회지 Vol.13 No.2
To investigate the restoration procedure on soil physical properties at the surface of visiting road affected by rest-year system. This study was carried out at visiting roads of stream of Chilsun in Jirisan. Mean soil strength in 20cm of soil depth was lower in the Rest-Year System areas (1.5-1.9 times in Site 2, 1.1-7.5 times in Site 3) than in the control (Site 1). Soil strength was recovered by the Rest-Year System in the national park. Mesopore rate (pF 2.7) in 0-15 cm of soil depth was higher in the Rest-Year System areas (1.2 times) than in the control. This indicates that mesopore rate is rapidly restoring in the Rest-Year System areas. Pore space rate in 0-7.5 cm of soil depth was higher in the Rest-Year System areas (23.2% in Site 2, 23.6% in Site 3) than in the control (22.4% in Site 1). Pore space rate in 7.5-15 cm of soil depth was also higher in the Rest-Year System areas (22.9% in Site 2 and Site 3) than in the control (18.9% in Site 1). Soil pore space was remediable by the Rest-Year System. Bulk density in 0-7.5 cm of soil depth was lower in the Rest-Year System areas (1.674g/cm3 in Site 2, 1.668g/cm3 in Site 3) than in the control (1.723g/cm3 in Site 1). Bulk density in 7.5-15 cm of soil depth was lower in the Rest-Year System areas (1.785g/cm3 in Site 2 and 1.721g/cm3 in Site 3) than in the control (1.721g/cm3 in Site 1). Soil bulk density was decreased in the Rest-Year System areas of the national park. Amount of soil erosion was lower in the Rest-Year System areas (0.017m3/km/yr in site 2, 0.023m3/km/yr in site 3) than in the control (0.054m3/km/yr in site 1).
박재현,우보명,김우룡,안현철,조현서,추갑철,김춘식,최형태,Park, Jae-Hyeon,Woo, Bo-Myeong,Kim, Oue-Ryong,Ahn, Hyun-Chul,Cho, Hyun-Seo,Choo, Gab-Chul,Kim, Choon-Sig,Choi, Hyung-Tae 한국환경복원기술학회 2001 한국환경복원기술학회지 Vol.4 No.3
This study was conducted to investigate physicochemical property changes from July 1998 to August 2001 in Mt. Bukhansan National Park. Four water sampling points were selected to measure the quality of stream water in the northeastern part of the Mt. Bukhansan National Park. The results were summarized as follows; In spring, the average pH of stream water was below the first class of the river water quality standard, while it was normal level in summer. The average electrical conductivity was about 2.3~3.3 times higher in downstream water than in upstream water during spring and summer. The contents of anions($Cl^-$, $NO{_3}^-$, $SO{_4}^{2-}$) were about 1.1~7.4 and 0.4~11.4 times higher in downstream than in upstream water, respectively. These results indicate that water quality was poorer in downstream than in upstream water. We suggest that stream water in the Mt. Bukhansan National Park should be protected from impacts of snow melting mineral particles in spring season and human impacts like wastewater of point source in summer season.
在植密度差異가 濟州在來大豆의 生育形質 및 種實收量에 미치는 影響
朴良門,趙南棋,韓在現,姜奉均 濟州大學校亞熱帶農業硏究所 1996 亞熱帶農業硏究 Vol.13 No.-
summaryThis experiment was carried out investigate the influence on different of planting density on agronomic and yield characters of cheju native soybean.The results are summarized as follows ;1. The narrower planting space, the higher stem length and the broader the planting space,the shorter, but stem diameter, number of nodes main stem and number of branches tended to be opposed. 2. Number of pods, dry stem weight and weight of 100 seeds were increased as the broader the planting space. 3. Seed yield was greatest in 341kg/10a than other planting space. 4. Dry stem weight was positively correlated with stem diameter and number of branches, and stem diameter was positively correlated with number of pods per plant, number of branches. But Stem length was negatively correlated with dry stem weight, weight of 100 seeds and stem diameter. Seed yield was negatively correlated with dry stem weight and weight of 100 seeds.
Strain Distributions of Plane-Strained and Simple-Sheared Al–Mg Alloy
Hyeon‑Woo Son,Jae‑Cheol Lee,Hyun Soon Park,Soong‑Keun Hyun 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
Strain distribution in plane-strained (rolling) and simple-sheared (torsion) Al–Mg alloy has been estimated using both X-rayline profile analysis and electron backscatter technique. The strain analyses under unified texture distribution by orientationrotation showed that torsion has relatively homogeneous strain distribution regardless of texture component in contrast toinhomogeneous strain in rolling. In addition, annealing texture of torsion has more random texture than inhomogeneousrolling texture. Lower texture difference index in annealed torsion specimens suggest homogeneous strain distribution insimple shear has a higher resistance to strain-induced boundary migration, which has been known to be main reason forstrong development of ND||⟨100⟩ component during annealing of rolled Al sheet.
가야산지역 계곡부와 능선부의 해발고와 사면부위에 따른 삼림구조
박인협,조재창,오충현 순천대학교 기초과학연구소 1990 基礎科學硏究誌 Vol.1 No.-
가야산지역 계곡부와 능선부의 해발고와 사면부위에 따른 삼림구조를 조사하기 위하여 해인사-두리봉 동측 계곡부(해발 600∼1,000m)에 해발고와 사면부위에 따라 63개 조사구 국일암-가야산 정부 능선부(해발 700m∼1,430m)에 해발고에 따라 38개 조사구를 설치하였다. 계곡부 전체의 군집형은 신갈나무-조록싸리군집이었으며, 능선부는 소나무, 신갈나무-진달래군집이었다. 계곡부와 능선부의 유사도지수는 38.2%이었다. 계곡부 전체의 종 다양도는 1.3402, 능선부는 1.0098이었다. 식생천이는 소나무, 잣나무 → 신갈나무 → 졸참나무, 서어나무로 진행되는 것으로 추정되었다. 계곡부의 사면 하부에서 상부로 감에 따라 상대우점치가 증가하는 수종은 신갈나무, 갈참나무, 진달래, 조록싸리 등이었으며, 상대우점치는 증가하는 반면, 소나무는 감소하는 경향을 보였다. 계곡부에서는 해발고가 높아짐에 라다 모두 감소하였다. 계곡부의 사면 상, 중, 하부간 유사도 지수는 66.6∼69.2%, 해발고대간 유사도지수는 25.9∼79.8%로써 사면 부위보다 해발고에 따른 종구성 상태의 차이가 심한 것으로 나타났다. 능선부에서는 해발고가 높아짐에 따라 교목상층 밀도, 흉고단면적은 감소하는 경향을 보였으며, 종다양도는 일정한 경향을 보이지 않았다. 능선부의 해발고대간 유사도 지수는 27.9∼98.2%이었다. A valley and a ridge forest in Mt. Gaya area was studied to investigate forest structure in relation to altitude and part of slope. Sixty-three quadrats were set up in the valley forest along altitude of 600m to 1,000m and part of slope, and thirty-eight quadrats were set up in the ridge forest along altitude of 700m to 1,430m. According to the importance values, the valley forest was Quercus mongolica-Lespedeza meximowiczii community and the ridge forest was Pinus densiflora, Quercus mongolica-Rhododendron community. Similarity index between the valley forest community and the ridge forest community was 37.2%. Shannon's species diversities of the valley forest community and the ridge forest community were 1.3402 and 1.0098, respectively. According to importance values by crown stories and DCA ordination, successional trends of tree species may be from Pinus densiflora and Pinus koraiensis through Quercus mongolica to Quercus serrata and Carpinus laxiflora. As going from the lower part to upper part of the slope in the valley forest, the importance values of Quercus mongolica and Quercus aliena, Rhododendron mucronulatum and Lespedeza meximowiczii increased while those of Carpinus laxiflora and Fraxinus rhynchophylla decreased. With increasing elevation in the valley and ridge forest, the importance value of Pinus densiflora decreased while that of Quercus mongolica increased. In the valley forest, densities of canopy and shrubstratum increased as increasing elevation, and the number of species and species diversity decreased as increasing elevation and going from the lower part to the upper of slope. The range similarity indices between parts of the slope, and the elevation belts of 100m in the valley forest were 66.6∼69.2 and 25.9∼79.8%, respectively. In the ridge forest, density and basal area of canopy tended to decreased as increasing elevation, and the range of similarity indices between elevation belts of 100m was 27.9∼98.2%.