Thionin - Sodium Dodecyl Sulfate 계의 상호작용에 있어서 염 및 유기용매의 첨가효과에 관한 연구

김성현,송기동 ( Sung Hyun Kim,Ki Dong Song ) 한국공업화학회 1994 공업화학 Vol.5 No.5

양이온 색소인 thionin(Th)과 음이온 계면활성제인 sodium dodecyl sulfate(SDS) 사이의 상호작용을 흡수 spectra로 고찰하였다. 임계미셀농도(critical micelle concentration, CMC)보다 훨씬 낮은 premicellar 영역(S/D=10, 80및 160)에서 온도가 증가함에 따라 몰 흡광계수비가 증가하거나 감소함을 볼 수 있으며, S/D=160에서 Th-SDS계의 다분자 회합체가 생성하는 가장 안정한 온도 범위는 60℃ 이하임을 알 수 있었다. 한편 Th-SDS계에 첨가한 무기염 및 유기 용매의 농도가 증가함에 따라 γ-band와 J-band는 감소하나 α-band는 오히려 증가하는 경향이 나타났다. 이들의 α-band의 증가 순서는 무기염의 경우 Cl^- > ClO₄^- > SO₄^(2-) > NO₃^-로 나타나며, 유기용매인 경우는 2-propanol>ethanol>methanol>ethylene glycol로 나타남을 알 수 있다. The interaction between the cationic dye, thionin(Th) and the anionic surfactant, sodium dodecyl sulfate(SDS) has been investigated by absorption spectra. As the temperature of surfactant solution was increased in premicellar range(S/D=10, 80, and 160) which was much lower than the critical micelle concentration(CMC), the increment or decrement of the molar extinction coeffecient ratio appeared. It was found that the most stable temperature range of the oligomer aggregate in Th-SDS system at S/D=160 was below 60℃. With increasing the concentration of inorganic salt and organic solvents in Th-SDS system, α-band was increased, but γ-band or J-band was decreased. The orders of α-band increasing power were Cl^- > ClO₄^- > SO₄^(2-) > NO₃^- and 2-propanol>ethanol>methanol>ethylene glycol.

기천(氣喘)에 대(對)한 문헌적(文獻的) 고찰(考察)

김성현,Kim, Sung-Hyun 대한한방내과학회 1992 大韓韓方內科學會誌 Vol.13 No.2

This study has been carried out to investigate the cause, symptom and treatment of Gi-Chun (氣喘) by referring to 32 literatures. The results were obtained as follows; 1. The factor causing Gi-Chun (氣喘) is almost damage of feeling (七情損傷). 2. The symptom of Gi-Chun (氣喘) is as follows. agony, breathing urgent, cold hand and feet, body tired, low appetite 3. The treatment of Gi-Chun (氣喘) is as follows. Sunpaeganggi(宣肺降氣), Jihaepyungchun(止咳平喘), gudam(去痰) 4. The drugs(herb) of Gi-Chun (氣喘) is as follows. Samatang(四磨湯), Sachiltang(四七湯), Sojaganggitang(蘇子降氣湯), Gilgyungjigaktang(桔梗枳殼湯), Gamisachiltang(加味四七湯), Gamisoyosan(加味逍遙散).

Humic Acid 가 PCB 의 착화합과 활성탄 흡착특성에 미치는 영향

김성현,백일현 ( Sung Hyun Kim,Il Hyun Beak ) 한국공업화학회 1993 공업화학 Vol.4 No.4

PCB와 HA 사이의 착화합 정도에 대한 양적인 측정을 위해 투석막을 이용한 평형실험이 여러 가지 변수에 대해 먼저 수행되었다. 활성탄에 대한 PCB의 흡착특성 파악을 위해서 HA가 용해된 물과 용해되지 않은 물을 이용하여 PCB에 대한 흡착평형 및 속도실험을 행하였다. 실험결과 HA에 대한 PCB의 착화합 정도는 pH, Ca^(2+)농도, 이온세기 및 HA의 농도에 큰 영향을 받는 것을 확인하였다. PCB의 활성탄에 대한 흡착능력은 HA가 물에 존재할 때 크게 감소하였으며 흡착특성은 HA, PCB와 HA에 착화합된 PCB 등의 물질이 서로 경쟁적으로 활성탄에 흡착하게 되는 복잡한 특성을 보일 것으로 판단되었다. Quantitative measurements have been made by using equilibrium dialysis techniques on the extent of complexation between PCB and dissoved humic acid(HA). This research investigates the effectiveness of activated carbon adsorption for the removal of PCB from organic free water and humic acid background solution by using bench-scale equilibrium and rate tests. It was found that the extent of complexation depended on the pH, calcium concentration, ionic strength, and the concentration of humic acid. When HA was present, activated carbon capacity was greatly reduced due to complexation and competitive adsorption effects and the adsorption characteristics became complicated by the presence of various species such as the unassociated HA, PCB, and PCB-HA complexes.

디지털 방사선 흉부영상의 영상개선과 임상평가

김성현,서태석,최보영,이형구,Kim, Sung-Hyun,Suh, Tae-Suk,Choe, Bo-Young,Lee, Hyoung-Koo 한국의학물리학회 2008 의학물리 Vol.19 No.3

본 연구의 목적은 디지털 방사선 흉부영상의 개선을 위한 영상처리방법을 제안하고 임상적 유용성을 평가하는 것이다. 흉부영상의 edge를 보존하면서 산란성 노이즈 제거를 위한 비선형의 반복 필터가 고안되었다. 영상의 다이나믹 레인지 (dynamic_range)의 조절이 이루어 졌으며, 해부학적 영역과 주변픽셀과의 호환성을 바탕으로 적응적 영상증강이 이루어졌다. 종격동 영역에서의 영상증강과 더불어, 폐 영역에서의 혈관조직, 기관지, 폐 조직 등이 적절하게 증강되었다. 3명의 판독의에 의한 임상평가가 이루어 졌으며, PA 영상에서는 11개, 그리고 Lateral 영상에서는 9개의 해부학적 영역이 면밀하게 관찰되었다. 각각 100장의 영상들이 ITU (International Telecommunication Union) recommendation 500에 따라 평가되어졌으며, 그 결과는 good과 adequate중간인 3.4의 평균치를 보였다. 이는 제안한 영상처리의 임상적 유용성이 최소한 양호함 이상의 가치가 있음을 의미한다. 유용한 해부학적 정보의 손실을 방지하기 위해, 영상표시장치와 인간의 인지계를 고려하면서 영상개선이 이루어졌다. 디지털 방사선기기의 등장으로 진단의 정확성을 향상시키기 위한 지속적인 영상 개선연구가 필요하다. The aim of this study is to suggest the method for image enhancement of digital chest radiograph and evaluate clinically the quality of the resultant image. A nonlinear iterative filter was developed in order to reduce quantum noise preserving edge. Dynamic range was adjusted and adaptive image enhancement was performed based on the property of anatomic region and the degree of compatibility with neighboring pixels. The lung fields were enhanced appropriately to visualize effectively vascular tissue, bronchus and lung tissue with the desired mediastinum enhancement. Clinic evaluation was performed by three radiologists with at least 8 years experience. The anatomic regions of 11 in PA and 9 in Lateral were observed carefully in each 100 radiographs according to ITU (International Telecommunication Union) recommendation 500 protocol. The result showed the mean 3.4 between good and adequate. This means that the clinical utility of the image quality is enough. In this study, image enhancement was carried out considering image display device and human perceptual system to prevent the loss of useful anatomic information. In order to increase the diagnostic accuracy in digital radiograph, the continuous study on image enhancement is needed.

현장 안전관리 감독자의 smartmaker 를 활용한 건설현장 근로자 정보 관리의 관한 연구

김성현,이지엽,손기영,Kim, Sung-hyun,Lee, Ji-yeob,Son, Kiyoung 한국건설안전학회 2020 한국건설안전학회 논문집 Vol.3 No.1

본 연구의 목적은 건설현장 근로자의 데이터 공유 시스템를 기반으로 건설재해 예방을 위한 근로자 정보 관리 모델을 구축하는 것이다. 이를 위해 첫째, 행연구 고찰을 통해 국내 건설현장의 외국인 근로자 현황을 파악하고, 정보 관리 애플리케이션에 대한 정보를 수집한다. 둘째, 스마트메이커 시스템을 활용하여 Brain storming을 실시하고, Aws를 통해 구축된 서버와 Family tree를 기반으로 개발된 애플리케이션의 기능을 분석한다. 셋째, 전문가 의견조사를 통해 개발된 정보 관리 모델의 경제성 및 효용성을 평가하고, 추가적인 기능 고찰 및 개선방안을 도출한다. 넷째, 개발된 정보 관리 모델의 국내 건설현장에서의 적용성에 대해 종합적으로 검토한다. 그 결과, 노무관리자와 현장 관리자 간의 보고체계가 단순화되어 노무자의 성실성 및 안전관리의 편리성이 있는 것으로 평가되었으며, 기능 추가 관련 사항으로는 자동 로그인 기능을 추가하여 편리성을 보완한다면 더욱 효과적일 것이라는 결론을 도출할 수 있었다. 본 연구의 결과는 향후 건설현장의 안전관리 시스템 구축연구의 기초자료로 활용될 것이다. In this study, an application was developed to reduce the work between labor and safety managers and to hire better workers when hiring workers. With the expected increase in foreign workers in the future, the number of illegal workers will also increase. As a result, accident and on-site management are becoming more difficult due to insufficient information collection of workers. Therefore, it was possible to secure on-site safety through an application that could collect accurate information and reduce the time of information exchange between safety managers and labor managers. In addition, the application was designed to help the safety manager identify the faithful workers more quickly when re-employment of the day laborers if many day laborers were assessed and filled out as they were. This anticipates the expected effect of shortening the construction period. The current application collected necessary information through an interview with the site manager. If the company collects more information needed in the field and has big data than it has collected necessary information so far, it will be highly competitive in the market as it can improve the completeness of applications by establishing opinions and reflecting information accordingly.

치주치료 후 구강 내 Volatile Sulfur Compounds(VSC)의 변화

김성현,채경준,정의원,김창성,최성호,조규성,채중규,김종관,방은경,Kim, Sung-Hyun,Chae, Gyeong-Jun,Jung, Ui-Won,Kim, Chang-Sung,Choi, Seong-Ho,Cho, Kyoo-Sung,Chai, Jung-Kyu,Kim, Chong-Kwan,Bang, Eun-Gyeong 대한치주과학회 2006 Journal of Periodontal & Implant Science Vol.36 No.3

Oral malodor may cause a significant social or psychological handicap to those suffering from it. Oral malodor has been correlated with the concentration of volatile sulfur compounds (VSC) produced in the oral cavity. Specific bacteria identified in the production of VSC have been reported and many of these bacteria are commonly suspected periodontal pathogens. The aim of this study was to estimate the change of the VSC concentration after periodontal treatment, Twenty subjects with probing depth $(PD)\;{\geq}5mm$ (experimental group) and 20 subjects with PD<5mm (control group) participated. VSC concentration measurement was made with gas chromatography. VSC concentration was measured at pre-treatment, 2 weeks after scaling and 1 month after periodontal treatment(root planning and flap operation). Maximum probing depth and bleeding on probing(BOP) were also examed at pretreatment and 1 month after periodontal treatment, The conclusions were as follow: 1. In the experimental group VSC concentration and CH3SH/H2S ratio were higher than control group. (p<0.05) 2. Both VSC concentration and CH3SH/H2S ratio showed decrease after periodontal treatment, But only CH3SH/H2S ratio after 1 month periodontal treatment was statistically significantly different from pre-treatment. (p<0.05) 3. CH3SH/H2S ratio tended to be on increase according to maximum probing depth and bleeding on probing. Periodontal disease could be a factor that caused oral malodor and oral malodor could be decreased after periodontal treatment.

화개산(華蓋散)이 GUINEA PIG의 기관지(氣管支) 평활근(平滑筋)에 미치는 영향(影響)

김성현,Kim, Sung-Hyun 대한한방내과학회 1990 大韓韓方內科學會誌 Vol.11 No.1

In order to study the effects of HWA GAE SAN known clinically for their effects of treatment for cough and asthma, the study was carried out to investigate the effect of HWA GAE SAN extract on the contractile force of isolated guinea pig trachea smooth muscle and elucidate its mechanism. The results were obtained as follows. 1. Preparation of isolated guinea pig trachea smooth muscle was suspended in the oxygeneted Kreb's Henseleit bicarbonate buffer solution at $37^{\circ}C$ and recorded the developed tension by the drug with the isometric transducer (Nacro F-60). The restin tension was approximately 0.5g. 2. The trachea smooth muscle in normal state showed a significant atony to the increase of density of HWA GAE SAN. 3. The atonic effect of the trachea smooth muscle was restricted after prescription of Pyrilamine& Cyproheptadine. Hireceptor broker, which were prearranged. 4. After 5, 15, 50& $150{\mu}l/ml$ of HWA GAE SAN were prescribed, the atony of trachea smooth muscle was caused by Histamine. 5. After 50& $150{\mu}l/ml$ of HWA GAE SAN were prescribed, the atony of trachea smooth muscle was remarkably dwindled which was caused by Acetylcholine. 6. After $150{\mu}l/ml$ of HWA GAE SAN were prescribed, the atony of trachea smooth muscle was remarkably dwindled which was caused by 5-Hydroxytryptamine.

수학적 재능에 대한 Krutetskii의 연구 분석

김성현,한인기,Kim, Sung-Hyun,Han, In-Ki 영남수학회 2011 East Asian mathematical journal Vol.27 No.4

In this study we study Krutetskii and Krutetskii's monograph 'The Psychology of Mathematical Abilities in Schoolchidren' which is published in Russia(in Russian) and USA(in English). We describe Krutetskii's biography briefly, which was not published in Korea. We analyze the methods, procedures, and results which are presented in the Krutetskii' work, and systemize these. Our study will give a overview of Krutetskii' viewpoint about mathematical abilities.

증기화 증폭시트를 적용한 전자빔 가공 특성 연구

김성현,정성택,김현정,백승엽,Kim, Seong Hyun,Jung, Sung Taek,Kim, Hyun Jeong,Baek, Seung Yub 한국금형공학회 2018 한국금형공학회지 Vol.12 No.2

Recently, as machine components and products are getting smaller, it is demanded to develop superprecision production technologies multilaterally. Along with the advancement of production technology, people are paying keener attention to the development of eco-friendly technology and efficient processing technology. Particularly, in many industries related to automobiles, shipbuilding, or airplane components, it is demanded to obtain technology to process multiple micro-holes. On account of this trend, micro-hole processing employing high-power electron beams is rising nowadays, and more interest is being shown in it, too. In Korea, however, the process of manufacturing vaporized amplification sheets influencing high-power electron beam processing technology and the processability considerably has not been developed sufficiently yet. Therefore, this study has applied vaporized amplification sheets manufactured to analyze the processability of high-power electron beams and examine necessity for vaporized amplification sheets.

N과 AlN 시트에 다양한 기체(CO_x, NO_x, SO_x)의 흡착에 관한 이론 연구

김성현,김백진,신창호,김승준,Kim, Sung-Hyun,Kim, Baek-Jin,Shin, Chang-Ho,Kim, Seung-Joon 대한화학회 2017 대한화학회지 Vol.61 No.1

본 연구는 그래핀과 유사한 2차원 붕소-질소(BN)와 알루미늄-질소(AlN) 시트에 여러 대기 유해 가스($CO_x$, $NO_x$, $SO_x$)가 흡착될 때의 구조적 특징과 결합에너지를 밀도 범함수 이론(DFT)과 MP2 방법을 사용하여 연구하였다. 분자 구조는 $B3LYP/6-31G^{**}$와 $CAM-B3LYP/6-31G^{**}$이론 수준에서 최적화하고, 진동 주파수를 계산하여 열역학적으로 가장 안정한 분자 구조를 확인하였다. 결합에너지는 $MP2/6-31G^{**}$ 이론 수준에서 한 점(single point) 에너지를 계산하고, 영점 진동에너지(ZPVE)와 바탕집합 중첩에러(BSSE)를 모두 보정하였다. BN 시트에 가스의 흡착은 모두 물리흡착으로 예측되었으며, AlN 시트에 대한 가스 흡착은 $CO_x$나 $NO_x$에 대해서는 물리흡착이 그리고 $SO_x$에 대해서는 화학 흡착이 일어날 것으로 예측되었다. The adsorption of various atmospheric harmful gases ($CO_x$, $NO_x$, $SO_x$) on graphene-like boron nitride(BN) and aluminum nitride(AlN) sheets was theoretically investigated using density functional theory (DFT) and MP2 methods. The structures were fully optimized at the $B3LYP/6-31G^{**}$ and $CAM-B3LYP/6-31G^{**}$ levels of theory and confirmed to be a local minimum by the calculation of the harmonic vibrational frequencies. The MP2 single-point binding energies were computed at the $CAM-B3LYP/6-31G^{**}$ optimized geometries. Also the zero-point vibrational energy (ZPVE) and 50%-basis set superposition error (BSSE) corrections were included. The adsorptions of gases on the BN sheet were predicted to be a physisorption process and the adsorptions of gases on the AlN sheet were predicted to be a physisorption process for $CO_x$ and $NO_x$ but to be a chemisorption process for $SO_x$.