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임정남(Jung Nam Im),김윤진(Yoon Jin Kim) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
패취 시스템의 감염 방지 기능을 향상이나 상처 치유 효과를 높이기 위해 다공성 구조를 갖는 피부 접촉층이 주목받고 있다. 본 연구에서는 습식 부직포 제조 공정을 이용하여 피부 접촉층용 비스코스 레이온 부직포를 제조하여 그 특성을 평가하였다. 비스코스 레이온 부직포를 평량별로 제조하여 그 특성을 평가하였고, 나노피브릴화된 아크릴 섬유를 혼합하여 마이크로/나노하이브리드 부직포를 제조하였다. 제조한 하이브리드 부직포는 기공 특성 및 물리적 특성을 우수하여 박막형 다공성 피부접촉층으로 이용하기에 우수한 특성을 나타냈다.
임정남,정영상,류관식,유순호,Im, Jeong-Nam,Jung, Yeong-Sang,Ryu, Kwan-Shig,Yoo, Sun-Ho 한국토양비료학회 1982 한국토양비료학회지 Vol.15 No.4
Soil water changes in lysimeters with four different soils and two different available soil depths were monitored during the growing seasons of the soybean-barley cropping from 1977 to 1980 in Suweon to evaluate evapotranspiration (ET) as a function of available soil water and evaporative demand of the atmosphere. ET was calculated with soil water profile and water balance. Soil water content was measured with a neutron moisture depth gauage and The evaporative demand of the atmosphere was estimated with a class A pan evaporation. Rainfall. solar radiation, and wind speed were observed to examine heat and water balances. The average ET of soybeans ranged from 1.6 mm/day at seedling to 6.5 mm/day at flowering, and that of barley ranged from 0.5 mm/day at the regrowth stage to 4.6 mm/day at heading; however, a large variability was observed. The ratio of ET to pan evaporation ($ET/E_o$) ranged from 0.5 to 1.1 for soybeans and 0.4 to 1.2 for barley. The soil evaporation factor ($K_e$) of the $ET/E_o$ component decreased as the soil water depleted and the canopy developed. The crop transpiration factor ($K_t$), another component of $ET/E_o$, also was a function of time and the soil water. $K_t$ was constant when the available soil water fraction (f) in the root zone was greater than a threshold value, and $K_e$ was decreased linearly when f was lower than this threshold. The threshold was 0.7 for the moderate evaporative demand days, 0.4 to 0.5 for the low evaporative demand days, and 0.9 to 0.96 for the high evaporative demand days. Conclusively, the ET can be estimated from the evaporative demand of the atmosphere, $E_o$, $K_e$ and $K_t$, and the available soil water content in the root zone. 기상자료(氣象資料)와 토양수분조건에 의하여 작물(作物)의 증발산량(蒸發散量)을 산정(算定)할 수 있는 방법(方法)을 모색(模索)하기 위하여 유효토심과 토성(土性)이 상이(相異)한 Lysimeter내(內)에서 콩-보리를 재배(栽培)하면서 1977년(年)부터 1980년(年)까지 토양수분함량(土壤水分含量)의 변화양상을 조사(調査)하였다. 증발산량(蒸發散量)은 깊이별(別) 토양수분함량(土壞水分含量) 증성자(中性子) 수분측정기(水分測定器)(Neutron moisture depth gauge)로 조사(調査)하여 물수지식에 의거(依據) 계산(計算)하였으며, 대기(大氣)의 증발요구도(蒸發要求度)는 대형(大型)팬 증발량(蒸發量)을 직접(直接) 이용(利用)하였고, 열(熱)-물 수지를 계산(計算)하는데 강우량(降雨量) 일사량(日射量) 풍속(風速)을 활용(活用)하였다. 작물(作物)의 1일(日) 증발산량(蒸發散量)은 산출기간(算出値間)에 변이(變異)가 컸으나 평균(平均)해서 보면 콩에 있어서는 파종기(播種期)에 1.6mm/일(日)에서 개화기(開花期)에 6.5mm/일(日)에서 범위(範圍)이었고, 보리에 있어서는 월동직후(越冬直後)에 0.5mm/일(日)에서 출수기(出穗期)에 4.6mm/일(日)의 범위(範圍)에 있었다. 대형(大型)팬 증발량(蒸發量)에 대한 증발산량(蒸發散量)의 비(比)(ET/Eo)는 콩에서는 0.5~1.1, 보리에서는 0.4~1.2범위이었다. ET/Eo는 토양증발인자(土壤蒸發因子)(Ke)와 작물증산인자(作物蒸散因子)(Kt)로 구분 평가하였는데 Ke는 0.02~0.60, Kt는 0~1.2 범위(範圍)로 밝혀졌다. Ke는 토양수분(土壤水分)이 낮을수록 작물피복도(作物被覆度)가 클수록 감소(減少)되는 양상(樣相)을 보였으며 Kt는 근권(根圈)의 유효수분률(有效水分率)(f)이 임계치(臨界値) 이상(以上)에서는 일정(一定)값을 보이나 그이하(以下)에서는 f에 따라 직선적(直線的)으로 감소(減少)되는데 그 변화양상(變化樣相)은 작물(作物)과 대기(大氣)의 증발요구도(蒸發要求度)에 따라 다르게 나타났다. Kt가 직선적(直線約)으로 감소(減少)되는 임계(臨界) f치(値)는 Eo가 클 경우에는 0.90~0.95, 보통일 때는 0.7정도, 낮을 때는 0.4~0.5이었다. 이상에서 밝혀진 Eo, Ke, Kt 및 f를 이용(利用)하여 콩-보리 작부(作付)에서 증발산량(蒸發散量)을 산출(算出)할 수 있도록 수식화하였다.
임정남(Jung Nam Im),이재경(Jae Kyoung Lee),유중조(Jung Jo Yuu) 한국토목섬유학회 2009 한국지반신소재학회 학술발표회 Vol.2009 No.11
The thermal, mechanical properties and their degradation behavior of various PLA(Poly lactide) resins was investigated. PLA6201D, PLA4032D and PLA2002D of Natureworks was used as candidates for the potential green geosynthetics. PLA4032D showed the appropriate properties in terms of degradation.
임정남,이의소,고석원,Im, Jung-Nam,Lee, Eui-So,Ko, Sohk-Won 한국섬유공학회 1997 한국섬유공학회지 Vol.34 No.8
The polyester/cotton 50/50 blend fabrics were treated with 1,2,3,4-butanetetracarboxylic acid (BTCA) by pad-dry-cure process to improve the smooth drying property. Sodium acetate (SA), non-phosphorus compound, was used as an alternative catalyst, because the conventional catalyst, sodium hypophosphite (SHP), has disadvantages such as high cost, eutrophication, and shade changes in certain dyed fabrics. The reaction condition and mechanical properties of fabrics treated with BTCA/SHP or BTCA/SA were investigated. The ester-crosslinking reaction was influenced by curing temperatures, the concentration of BTCA and catalyst, and pH values of the padding liquor. The fabrics treated with BTCA/SA were comparable to those treated with BTCA/SHP in respect of wrinkle recovery, DP rating, and whiteness index, and had better strength retention. The content of carboxyl group in treated fabrics became higher with the increase of the concentration of BTCA.
시선추적과 뇌파를 활용한 한국어 학습자의 읽기 과정 분석
임정남(Jung Nam Im),만승남(Seung Nam Min),조성문(Sung Moon Cho) 대한인간공학회 2017 大韓人間工學會誌 Vol.36 No.6
Objective: The purpose of this study is to establish the goal with the reading stage of Korean learners in Korean language education institutions for preparing enter university using EEG and eye tracker. Background: International students enter the university after completing Korean language education finding lots of difficulties in classes handled in Korean. This is due to the current qualitative evaluation method adopted by the Korean teachers. Therefore, the international students need a proper learning method. Method: The Korean language proficiency test and learner’s level are classified as a beginner, intermediate, and advanced levels. The reading process was measured using Eye tracker and EEG. The independent variables consisted of 3 text level and 3 learner’s level. The dependent variables consisted of fixation time, fixation number, saccade number, saccade time, and stress index. The variance analysis was performed with 3 × 3 within subject design. Results: As the text level increased, the fixation time and number were lowered for beginner, intermediate, and advanced learner. Even the number of fixation decreased, the understanding score as significantly increased. It was also found that the part of fixation number was related to process vocabulary and grammar. The text level significantly increased when saccade number increased. In addition, the saccade number significantly increased for the learner language level. There was no significant difference in the level of text difficulties between beginner and intermediate learners. Nevertheless, we found that advanced learners were confirmed with higher saccade time in beginner difficulty text. Conclusion: The fixation ratio was higher for beginner learners. Similarly, it was found that fixation time had a constant pattern with respect to learners’ proficiency regardless of difficulty level. The saccade time affects the learners’ level of text understanding. Also, the number of saccades associated with grammar and vocabulary. Application: In the future, if this study focus on a word and grammar in a sentence using EEG and eye tracking, this can prepare a study design for Korean reading system.
Degradation of Poly(lactic acid) and Poly(butylene adipate-co-terephthalate) Blends in Compost
임정남,도성준,김윤진,유중조,Im, Jung Nam,Doh, Song Jun,Kim, Yoon Jin,Yuu, Jungjo The Korean Fiber Society 2015 한국섬유공학회지 Vol.52 No.5
Geotextiles are used extensively to protect soil from erosion. In this study, we evaluated the mechanical properties and degradation behaviors of poly(lactic acid)/poly(butylene adipate-co-terephthalate) (PLA/PBAT) blends. The incorporation of PBAT to PLA decreased the tensile strength and modulus but increased the elongation at break of the blends. Tensile strength and elongation of the PLA/PBAT blend resins were dramatically improved by incorporating a chain extender. When PLA/PBAT blends were composted under $35^{\circ}C$, 90% RH conditions, they showed two-stage degradation and completely lost their mechanical properties after 40 weeks. The PBAT-dominant blend (PLA/PBAT 40/60) showed slightly slower degradation than the PLA-dominant blend (PLA/PBAT 60/40).