이성분 응고중에 mush 층과 액체층의 온도 및 농도분포

황인국 수원대학교 산업기술연구소 1998 산업기술연구소논문집 Vol.13 No.-

When a binary melt is solidified from a cooling boundary, thermal or compositional boundary layers develop in liquid and mushy layers. The governing equations, which link the liquid layer with the mushy layer, are derived by using the similarity variable. The temperature and concentration profiles in the liquid and mushy layers are investigated numerically. The results show that the compositional boundary-layer thickness increases with increasing the Lewis number.

[P10-57] 열처리조건에 따른 인삼의 특성 변화

황인국,유정식,김자영,우관식,이준수,정헌상,양승준 한국식품영양과학회 2005 한국식품영양과학회 학술대회발표집 Vol.2005 No.10

고추품종별 재배년도와 재배지역에 따른 품질 특성

황인국,유선미,이준수,Hwang, In Guk,Yoo, Seon Mi,Lee, Junsoo 한국식품영양학회 2014 韓國食品營養學會誌 Vol.27 No.5

본 연구에서는 우리건, 부강 및 무한질주 세 고추 품종을 대상으로 2011년도와 2012년도 2년간 10개 지역에서 재배, 수확하여 capsaicinoids 함량, 유리당 함량 및 ASTA color value를 분석하여 재배년도별, 지역별 특성을 비교 분석하였다. 재배지역별 우리건, 부강 및 무한질주 고추 품종의 총 capsaicinoids 함량은 각각 52.53~362, 15.35~126.40 및 3.41~50.86 mg/100 g 범위였고, 고추 품종별 평균 총 capsaicinoid 함량은 우리건 > 부강 > 무한질주 순으로 유의적으로(p<0.05) 높았다. 세 고추 품종의 주요 유리당으로는 fructose와 glucose가 검출되었고, 일부 지역의 우리건 고추에서 sucrose가 소량 검출되었다. 지역별 우리건, 부강 및 무한질주 고추 품종의 총 유리당 함량은 각각 18.29~35.54, 16.91~32.83 및 18.63~33.21%이었고, 품종별 평균 유리당 함량은 재배년도 및 품종에 따른 유의적인 차이가 없었다. 재배지역별 우리건, 부강 및 무한질주 고추 품종의 ASTA color value는 각각 57.17~132.61, 66.23~139.49 및 85.43~133.26 범위였고, 세 품종 모두 2011년도에 비해 2012년도에 재배한 고추의 ASTA color value가 높았다. 이상의 결과로부터 고추의 capsaicinoids 함량 변이는 품종에 의한 영향이, 유리당 함량과 ASTA color value는 환경적 요인에 의한 영향이 더 큰 것으로 판단되며, 추후 고추 육종 및 재배, 고춧가루 가공제품 생산 등의 연구에 기초 결과로 활용할 수 있을 것으로 생각된다. This study was conducted to investigate the amounts of capsaicinoid and free sugar, as well as ASTA color values in three pepper cultivars grown in different regions of Korea. Pepper cultivars from ten different regions of Korea were collected in 2011 and 2012. The capsaicinoid contents of the three cultivars, Urigun, Bugang, and Muhanjilju, varied in the range of 52.53~362, 15.35~126.40, and 3.41~50.86 mg/100 g, respectively, depending on their cultivation region. Among the three cultivars, Urigun had the highest average capsaicinoid content, followed by Bugang and Muhanjilju. The free sugar contents of Urigun, Bugang, and Muhanjilju varied in the range of 18.29~35.54, 16.91~32.83, and 18.63~33.21%, respectively, depending on the region. Average free sugar contents did not vary significantly among the cultivars grown in different regions as well as in different years. The ASTA color values of Urigun, Bugang, and Muhanjilju varied in the range of 57.17~132.61, 66.23~139.49, and 85.43~133.26, respectively. ASTA color values of the three cultivars grown in 2012 were significantly higher than those grown in 2011. Variations in the amounts of capsaicinoids, free sugar contents, and ASTA color values observed in this study can be attributed to the intrinsic genetic characteristics of each cultivar or alternatively to the environmental conditions. We assume that the quantity of capsaicinoid is affected more by the genotype than the cultivation region, whereas the reverse holds for the variations in free sugar quantity and ASTA color values.

적니를 이용한 황화수소제거용 흡착제의 제조

黃仁菊,裵在欽 水原大學校 2004 論文集 Vol.22 No.-

Red mud is generated as a by-product during the production of aluminum hydroxide from bauxite ore. In this study, adsorbents were prepared for removal of hydrogen sulfide (H₂S) using the red mud. The fixed-bed adsorption experiments were performed under various experimental conditions. The red mud adsorbent heat-treated at 600℃ and added with CuO showed the best performance in adsorption of hydrogen sulfide.

시간의존형 응고계에서 성분적 대류 모델

황인국 水原大學校 2012 論文集 Vol.26 No.-

The onset of convection in a mushy layer with a permeable interface is investigated using a simplified porous-block model. The time-dependent stability equations in the mushy layer are transformed similarly by using the developing mushy-layer thickness as a length scaling factor. The critical conditions to mark convective motion in the mushy layer are obtained numerically. The critical Darcy-Rayleigh numbers are obtained for various values of the superheat. With increasing the superheat the system becomes more unstable.

적니를 이용한 무기응집제의 개발연구

배재흠,황인국 수원대학교 산업기술연구소 1999 산업기술연구소논문집 Vol.14 No.-

Red mud is generated as a by-product during the production of aluminum hydroxide from bauxite ore. In this study inorganic coagulants were prepared by leaching aluminum and iron from red mud with acids under the various operating conditions. The optimum leaching efficiency of Al and Fe was obtained by contacting red mud with acids of 5M H₂SO₄ and 9M HCl with the ratio of 1/10(g/㎖) at 85℃ and 25℃, respectively. In addition, the removal experiments of heavy metal ions (??) and turbidity in the aqueous solution were also studied in various experimental conditions. As a result, the developed coagulants are found to show a good removal performance of heavy metal ions and turbidity in aqueous solutions.

소음성난청에서 구형낭 기능의 평가

황인국,문지현,김영효,김규성,정윤건,최호석 대한평형의학회 2008 Research in Vestibular Science Vol.7 No.1

Background and Objectives: Considering saccular receptors are coupled physically with the auditory receptors, VEMP test may provide the information that in the noise induced hearing loss with or without dizziness, damage to the vestibular system, especially saccule is a potential organ with cochlear damage. Material and Methods: 11 patients (22 ears) with HF-SNHL greater than 55dB and 10 patients (10 ears) with sudden hearing loss of varying degree HL as positive control but without clinical manifestations of vestibular pathology tested for vestibular function test was enrolled. VEMP test was done. The results were compared with those of 9-healthy referents (18 ears) examined in the same way. Results: VEMP wave was significantly abolished as twelve of 22 (54.5%) with HF-SNHL, five of 13 (38.5%) and Control group (100%). Though there was no statistically significant relation with P13, N23 latency delay in each group, NIHL showed P13, N23 latency delay trend compared with controls. Conclusions: Patients with noise induced hearing loss showed significantly more saccular deterioration, estimated as negative VEMP responses than did the controls. This suggests subclinical disturbances of the vestibular system especially of the saccule in noise induced hearing loss. Background and Objectives: Considering saccular receptors are coupled physically with the auditory receptors, VEMP test may provide the information that in the noise induced hearing loss with or without dizziness, damage to the vestibular system, especially saccule is a potential organ with cochlear damage. Material and Methods: 11 patients (22 ears) with HF-SNHL greater than 55dB and 10 patients (10 ears) with sudden hearing loss of varying degree HL as positive control but without clinical manifestations of vestibular pathology tested for vestibular function test was enrolled. VEMP test was done. The results were compared with those of 9-healthy referents (18 ears) examined in the same way. Results: VEMP wave was significantly abolished as twelve of 22 (54.5%) with HF-SNHL, five of 13 (38.5%) and Control group (100%). Though there was no statistically significant relation with P13, N23 latency delay in each group, NIHL showed P13, N23 latency delay trend compared with controls. Conclusions: Patients with noise induced hearing loss showed significantly more saccular deterioration, estimated as negative VEMP responses than did the controls. This suggests subclinical disturbances of the vestibular system especially of the saccule in noise induced hearing loss.

Mush 층과 액체층에서 대류의 발생

黃仁菊 水原大學校 2003 論文集 Vol.21 No.-

The convective instabilities of a binary melt during directional solidification are analyzed under linear stability theory by using the propagation theory. The stability equations for liquid and mushy layers are transformed similarly by using the developing mushy-layer thickness as the length scaling factor. The onset conditions to mark convective motion in the liquid and mushy layers are obtained numerically for time-dependent solidification. The results show that for small Lewis numbers the mushy-layer-mode convection occurs faster than the boundary-layer-mode convection and the system is more stable with decreasing the superheat.

산과 열처리에 따른 마늘 Fructan과 항산화활성 변화

황인국,김기찬,최성길,이준수,정헌상 경상대학교 농업생명과학연구원 2010 농업생명과학연구 Vol.44 No.1

마늘의 주요 저장성분인 fructan을 산 가수분해시키고 열처리에 따른 폴리페놀함량과 항산화활성의 변화를 살펴보았다. 마늘 fructan의 최적 산가수분해 조건은 0.3N H2SO4으로 5분간 반응시켰을 때로 나타났다. 열처리에 의한 fructan 함량은 열처리 온도가 증가함에 따라 240.5 mg/g에서 2.0 mg/g으로 분해되어 감소하였으며, 총 폴리페놀 함량은 열처리 온도 증가에 따라 0.85 mg/g에서 13.74 mg/g으로 증가하였고, 항산화활성(IC50)은 열처리온도가 증가에 따라 52.9 mg/mL에서 1.5 mg/mL으로 증가하였다. 열처리 후 산가수분해시 총 폴리페놀 함량 및 항산화활성은 증가하였다. 마늘 fructan을 분해하여 식품소재로서의 활용과 동시에 항산화활성을 강화시키기 위한 열처리 조건으로는 130℃, 2시간 처리가 적합한 것으로 판단되었다. This study was to investigate the fructose, total fructan, polyphenol contents, and antioxidant activity of garlic treated acid and heat(100~140°C for 2 hr). Optimum condition of acid hydrolysis of fructan was 0.3N H2SO4 and 5 min. As increasing heating temperature, fructose content was significantly increased from 17.1 to 189.9 mg/g whereas total fructan content was decreased from 248.1 to 2.0 mg/g. The fructan was mostly hydrolyzed by heating at 130°C for 2 hr. The polyphenol contents was increased from 0.85 to 13.74 mg/g increasing heating temperature and also antioxidant activity was significantly increased. The polyphenol contents and antioxidant activity on acid hydrolysate after heating was slightly increased

Reverse Offset Printed Silver Nanowire Electrodes with Large-Area and Fine Micro-Patterning

황인국,김종윤,박규태,이윤구 한국고분자학회 2020 한국고분자학회 학술대회 연구논문 초록집 Vol.45 No.2