Evaluation of nutrient loading technique potential of domestic tree species to promote forestation

이승범,곽진협,오예림,백누리,박서우,신은서,최우정 한국토양비료학회 2024 한국토양비료학회지 Vol.57 No.1

Reclaimed lands, including reclaimed tidelands, usually have poor soil conditions, such as low nutrient and organic matter contents and poor soil structures, which hamper adaptation and survival of newly transplanted tree seedlings. Nutrient loading technique is the concept of accumulating more nutrient in plant parts while maintaining biomass, which can increase growth and survival rates after transplanting in nutrient poor soils. However, possibility of nutrient loading on domestic tree species has not been evaluated in Korea. This study was conducted to test and select the optimum nutrient loading models for domestic tree species. Three nutrient loading models, including conventional (constant fertilizer dose), exponential (increasing fertilizer dose as exponential curve), and modified exponential (exponential increase but compensate initial fertilization), were tested for three tree species; Pinus thunbergii, Quercus acutissima, and Zelkova serrata. Seedlings were grown in a greenhouse from June to September in 2020, and selected amount of fertilizer was applied weekly. Three seedlings were collected randomly every 4 weeks in each tree species and nutrient loading model, and dry matter and nitrogen (N) concentration in each part, including root, stem, and leaf, were analyzed, and seeding height was measured. Seedling height was not different with nutrient loading models for all tree species. For P. thunbergii, dry matter and N content were the highest with the conventional and modified exponential models, and for Q. acutissima and Z. serrata, the modified exponential model was the best. The modified exponential model resulted in the highest nutrient loading efficiency due to the compensation of N supply at the beginning of growing stage and the higher N supply rates at the late growing stage compared to the conventional model. However, survival rate of seedlings for exponential model decreased after middle growing stage because of toxicity of excessive N fertilization due to rapid supply of N. Therefore, diverse rate of N fertilization needs to be tested to select the optimum nutrient loading models for each species. Furthermore, field study is needed to test if nutrient loaded seedings grow better than conventional seedlings at poor soil condition lands.

밀싹으로부터 플라보노이드성분의 초음파 추출 : 중심합성계획모델을 이용한 최적화

이승범,Xiaozheng Wang,홍인권 한국공업화학회 2018 공업화학 Vol.29 No.6

초음파 추출공정을 이용하여 밀싹으로부터 유효성분을 추출하고, 중심합성계획모델을 이용하여 추출공정을 최적화하였다. 중심합성계획모델의 반응치로는 추출수율과 플라보노이드성분 함량을 설정하고, 독립변수인 추출시간, 주정/초순수 부피비, 초음파 조사세기에 따른 주효과도와 교호효과도를 해석하였다. 추출수율의 경우 주정/초순수의 부피비와 초음파 조사세기가 상대적으로 큰 영향을 미쳤으며, 플라보노이드성분 함량의 경우에는 추출시간의 영향이 가장크게 나타났다. 추출수율과 플라보노이드성분 함량을 모두 고려한 결과 최적조건은 추출시간(17.00 min), 주정/초순수의 부피비(50.25 vol%), 초음파 조사세기(551.70 W)이며, 이때 예측 추출수율은 28.43 wt%, 예측 플라보노이드성분 함량은 29.99 μg QE/mL dw을 얻을 수 있었다. 실험을 통해 유효성분 추출수율(28.73 wt%), 플라보노이드성분 함량(29.65 μg QE/mL dw)의 실험값을 얻을 수 있었으며, 이를 예측값과 비교했을 때 오차율은 각각 1.05, 1.13%이다.

Preparation of CuO powder for electroplating using lead frame etching wastes

이승범,정래윤,김선회 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.64 No.-

A novel method for manufacture of copper(II) oxide for copper electroplating solution is proposed in this paper. The copper(II) oxide was produced through two chemical reaction steps without sintering process after refinement of waste lead frame etching solution. The experimental major parameters were the amount of additives for first and second step, sodium carbonate and sodium hydroxide, respectively, to evaluate reaction characteristics. Also, the liquidity (angle of repose), solubility to sulfuric acid, chloric ion concentration and thickness of dimple thickness of plating hole were verified for the physical properties of copper(II) oxide as electroplating material. The reaction molar ratio of sodium carbonate was low, and was generated more than .The optimum reaction mole ratio of sodium carbonate to copper chloride was revealed as 1.5. The optimum usage of sodium hydroxide for manufacture of copper(II) oxide using basic copper carbonate, produced at first reaction step, was 150 g. In these conditions, the average particle size of copper(II) oxide, the dissolution time for sulfuric acid, and the angle of repose were 21.49 μm, 62 s, and 35.5°, respectively. The yield of copper(II) oxide was 98.0 wt.%, for this optimum usage. Also, the via-filling hole thickness was 13.5 μm, which satisfies general via-filling hole thickness range, less than 15 μm.

Copper(II) oxide powder manufacture for via-filling plating from H2O2 type etching wastes

이승범,정래윤,김선회 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-

Copper(II) oxide powder manufacture from H2O2 type etching waste is proposed. The basic coppercarbonate, the intermediate product, is depends on the reaction mole ratio of sodium carbonate to copperhydroxide. The optimum reaction mole ratio is 2.64 at 80 C under copper content of 57.5 wt.%. The optimum usage of NaOH is 120 g for Copper(II) oxide. The Copper(II) oxide yield and chlorine ionconcentration, are 97.0 wt.% and 9.0 mg L, respectively. The physical properties, such as mean particlesize, dissolution time, and angle of repose are 20.0 mm, 60 s, and 34.1 , respectively. The via-holefillingthickness is 9.4 mm, which satisfies general electroplating criteria, 15 mm.

고주파 유도가열 원리를 이용한 기상반응기 가열효과 분선

이승범,홍인권,천지득 한국공업화학회 2002 공업화학 Vol.13 No.4

본 연구에서는 공정 배출가스로부터 대기오염물질, 특히 휘발성 유기화합물이나 다이옥신 등의 제거를 위한 예비실험으로서 고주파 유도가열 방식을 도입한 기상반응기 가열공정을 개발하였다. 기상 반응기에 공기를 통과시켜 공기의 가열효과를 분석하고, 실제 공정에서의 적용가능성을 평가하였다. 실험에 사용된 고주파 발생장치는 최대출력 7.5 kW, 발진주파수 20 kHz인 고주파 유도가열장치이며, 공기의 유입온도는 상온(20 ℃)과 200 ℃로 설정하였다. 공기의 가열온도는 고주파의 출력과 체류시간 증가에 따라 증가되었으며, 특히 체류시간 3 s 이하의 조건에서는 가열효과가 급격히 감소되었다. 또한 유해가스의 처리 시 요구되는 온도 700∼800 ℃에 도달하는 온도를 얻을 수 있었으며, 출력의 증가나 에너지 손실을 줄이는 공정을 응용한다면 그 이상의 온도를 얻을 것으로 사료된다. 또한 기존의 공정에 비해 빠른 가열이 가능하여 산업현장에서의 이용가능성이 높을 것으로 기대된다. The thermal oxidation of air pollution substance (VOCs and dioxin, etc.) was studied using a high frequency induction heating process. To identify the heating effects on the air phase, a plug flow type gas reactor was designed. The induction heating system had the capacity to generate maximum of 7.5 kW and 20 kHz, and the inlet gas temperature was maintained between 20 and 200 ℃. The air temperature was increased as the induction heating power and time constant were increased. However, the air temperature decreased rapidly for the time constant less than 3 seconds. The maximum heating temperature was in the range of 700 and 800 ℃. In comparison to a conventional heating process, the benefit of using a high frequency induction heating process was the reduced requirement of heating time.

[발제 4] 비만인에게 걷기운동이 비만관련 지표 및 APOPTOSIS 요인에 미치는 영향

이승범 한국웰니스학회 2011 한국웰니스학회 학술발표회 Vol.2011 No.11

동적 시스템의 인증체계 도입에 필요한 조건

이승범 제어로봇시스템학회 2021 제어로봇시스템학회 국내학술대회 논문집 Vol.2021 No.6

유독성 유기용매의 촉매산화공정에서 혼합조성에 따른 간섭효과 ( Inhibition Effects of Toxic Solvent Mixture in Catalytic Oxidation Process )

이승범,김원일,홍인권,김형진 대한환경위생공학회 2001 대한환경위생공학회지 Vol.16 No.3

비이온성 혼합계면활성제를 이용한 O/W 유화액의 제조 : CCD-RSM을 이용한 최적화

이승범,리광종,줘청량,홍인권 한국공업화학회 2019 공업화학 Vol.30 No.5

본 연구에서는 palm oil과 서로 다른 HLB (hydrophile-lipophilie balance) value를 갖는 Tween-Span계 비이온성 계면활성제를 혼합하여 O/W (oil in water) 유화액을 제조하고, 유화액의 유화안정성을 향상시키기 위한 최적 유화조건을 결정하였다. 이를 위해 CCD-RSM (central composite design model-response surface methodology)을 이용하여 각 계량인자의주효과 및 교호효과를 해석하였으며, 두 가지 반응치를 동시에 만족하는 최적조건을 결정하였다. CCD-RSM의 계량인자로는 유화시간, 유화속도, HLB value, 계면활성제의 첨가량 등을 설정하고, 반응치로는 O/W 유화액의 점도와 평균액적크기를 설정하였다. CCD-RSM 최적화 분석결과 반응치인 O/W 유화액이 점도와 평균액적크기의 목표치를 동시에 부합하는 최적조건은 유화시간(12.7 min), 유화속도(5,551 rpm), HLB value (8.0), 계면활성제의 첨가량(5.7 wt.%)으로 산출되었으며, 이 조건에서의 CCD-RSM 예측결과는 점도(1,551 cP)와 평균액적크기(432 nm)이었다. 이 조건의 실제 실험 결과 오차율은 2.5% 이하로 나타나 O/W 유화액 제조과정에 CCD-RSM 최적화 분석을 적용할 경우 비교적높은 유의수준의 만족하는 결과를 얻을 수 있었다.

Thermal deformation of epoxy type resin for neon transformer housing

이승범,홍인권 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.3

This study focused on the experimental and theoretical evaluation of the thermal stability of epoxy resins for the development of neon transformer housings. A variety of hardeners was added to the epoxy resin to improve the thermal stability and workability of the neon transformer. Silicon dioxide (SiO2) also was added as a reinforcement filler. Then, the variation of the viscosity and thermal stability with the amount of reinforcement filler and hardener was evaluated. A hardener modified with cycloaliphatic aminewas superior to the polyamide type hardener in terms of the physical properties and the optimum curing conditions were found to be a curing time of 70 min at 343 K. The viscosity of the epoxy resin increased with increasing amount of silicon dioxide (SiO2), whereas the volume deformation ratio used for the evaluation of the thermal stability decreased. As a result, it was concluded that the polyamide type hardener had superior characteristics in terms of the workability and thermal stability and that the optimum silicon dioxide (SiO2) content was 50 wt%.