페탄광 주변 하천의 수질조사

정경훈,최형일,정오진,정재경,강성환,조영찬 조선대학교 환경공해연구소 1998 環境公害硏究 Vol.14 No.-

The Water quality for river surrounding closed coal mine in Hwasun area Chunnam was investigated. The investigated factors were pH, turbidity, conductivity, Fe, SO_(4)^(-2), Ca, and Mg concentration, and the crystallization form and components of suspended solids were also investigated by scanning electron microscope and energy dispersion system Extremely high value of turbidity and conductivity were represented in Honam Kwangup (N-7) and Honam Tanza (N-3)area, respectively. Fe concentration was lower in all sampling sites, and the concentration of SO_(4)^(-2) ion was higher than 200mg/L in all sampling sites excepting Dongyang Tanggwang area (N-2) and Hwail wetland (N-11). The SEM micrograph and EDS analysis showed that the crystallization form of the suspended solids was formless, These particles have size of less than 10??and the main components was O, Al, Fe and S. The corelation values between conductivity and Mg, SO_(4)^(-2), and Ca were 0.967, 0.959, 0.931, respectively, and the results indicate good corelation.

이부기형을 동반한 부교교합에서의 이부골성형술의 응용

장영일,서정훈,남동석,이하진 대한치과교정학회 1996 대한치과교정학회지 Vol.26 No.3

턱은 인간의 성격을 나타내는 요소의 하나로 적절하게 돌출된 턱은 심미적인 안모를 위해 대단히 중요하다. 이부골성형술은 턱의 형태재형성을 목적으로 하며 이를 통해 고정치료 목적의 하나인 안모의 심미성 향상에 기여할 수 있다. 이부골성형술은 수직, 수평적으로 턱의 크기를 확대시키는 축조이부골성형술과 축소시키는 축소이부골성형술로 나눌수 있으며 그활용하는 예는 다음과 같다. 1. 후퇴된 턱의 전진 2. 전방 돌출된 턱의 후퇴 3. 수직고경의 조절 4. 비대칭의 개선 The chin is one of the factors which express human character, and appropriately protruding chin is very important to harmonious profile, the purpose of genioplasty is to reshape the chin and improve the facial esthetics which is one of the purposes of orthodontic treatment, It can be classified as augmentation genioplasty which enlarge the chin vertico-horizontally and reduction genioplasty whcih smallen it. The examples to apply this procedure are as follows. 1. advancement of retruded chin 2. reduction of chin prominence 3. control of chin vertical dimension 4. correction of asymmetry

교정환자의 관리, 진단, 성장과 치료결과 분석을 위한 software 개발에 관한 연구

장영일,김태우,양원식,김근만,남동석,서정훈 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.4

It is prerequisite of orthodontists to diagnose malocclusion correctly and make treatment plans accurately for treating maloccluded patients efficiently and earning more stable and better results. Recently computers were introduced in orthodontic diagnosis steps, which enabled orthodontists to get more precise diagnosis, to make more accurate treatment planning and to provide better orthodontic cares for more patients. The authors studied on the diagnostic analysis methods which have been used frequently in Korea and made a diagnostic computer program including the horizontal and/or vertical measurement of length, degrees and proportions in lateral cephalometric radiographs, the analysis of the skeletal and soft-tissue features and the evaluation of the treatment results. We also made a scheduling program for arrangement and management of patients. 40 skeletal and 24 soft-tissue landmarks were selected in a lateral cephalometric radiographs. The available analysis methods in this program are Angular analysis, Linear analysis, Ricketts analysis, Profilogram, Steiner analysis, Tweed analysis, MacNamara analysis, Open bite analysis, Kim's diagnosis, Skeleto-dental cephalometric analysis and Height& weight analysis. We suggested that this diagnostic computer program make it possible for orthodontists to get more rapid and accurate diagnostic analysis and treatment planning and for patient to earn better and more efficient orthodontic service.

산부식시간이 법랑질 표면 부식형태와 교정장치의 전단접착강도에 미치는 영향에 관한 연구

서정훈,장영일,양원식,남동석 대한치과교정학회 1997 대한치과교정학회지 Vol.27 No.5

본 연구의 목적은 법랑질 표면에 대한 산부식시간의 차이가 법랑질 표면의 부식형태, 교정장치의 전단접착강도 및 탈락 양상에 미치는 영향을 알아보는 것이다. 교정치료를 위해 발거된 하악 소구치의 법랑질을 37%의 인산 용액을 이용하여 동일한 방법으로 각각 5, 10, 15, 30, 45, 60, 90, 120초동안 부식시킨후 법랑질 표면을 주사전자현미경으로 관찰하고, 교정장치를 접착한 후 Instron universal testing machine을 이용하여 전단접착강도를 측정하고 교정장치의 탈락양상을 관찰하여 다음과 같은 결론을 얻었다. 1. 산부식시간을 5-120초 범위에서 변화시켜도 교정장치의 전단접착강도는 통계학적으로 유의성 있는 차이가 없었다(p<0.05). 2. 산부식시간에 따른 교정장치의 탈락양상은 15초이하 부식군에서는 접착제/법랑질 경계부 탈락이 상대적으로 많았으나, 30초 이상 부식군에서는 접착제/교정장치 경계부 탈락이 많았다. 3. 법랑질 표면의 부식형태는 매우 다양하였으며 동일한 법랑질 표면에서도 여러 가지 형태의 부식 소견이 관찰되었다. 또한 법랑질 부식형태와 교정장치의 접착강도 사이에 연관성을 발견할 수 없었다. 4. 본 연구의 결과는 실험적 조건에서는 부식시간을 5초로 단축하여도 임상적으로 유용한 접착강도를 얻을 수 있음을 보여주고 있다. 그러나, 15초 이하 부식군에서 나타난 탈락양상에 대해서는 더 많은 연구가 이루어져야 할 것으로 여겨진다. The purpose of this in vitro study was to evaluate the effects of different acid etching times on th enamel surface morphology, shear bond strength and debonding failure mode of orthodontic attachment. Ninety six extracted human mandibular premolars were divided into eight groups of twelve teeth. The buccal surfaces were etched with 37% phosphoric acid for 5, 10, 15, 30, 45, 60, 90 and 120 seconds, respectively. Two teeth from each group were used for scanning electron microscope examination. On the etched buccal surfaces of remaining teeth, orthodontic attachments(lingual buttons)were bonded with light cured orthodontic adhesive. Twenty four hours after bonding, a Instron universal testing machine was used to determine shear bond strength of orthodontic attachment to enamel. After debonding, bases of orthodontic attachments and enamel surfaces were examined under stereoscopic microscope to determine failure mode. Statistical analysis of the data was carried out with on way ANOVA and Duncan's multiple range test. The results were as follows; 1. There was no statistically significant difference in shear bond strengths between the various etching times(p<0.05). 2. The failure modes of orthodontic attachments had some differences. In 5, 10 and 15 seconds etching groups, the percentage of adhesive/enamel interface failure was higher than that of adhesive/attachment interface failure. On the contrary, in 30, 45, 60, 90 and 120 seconds etching groups, the results were reversed. 3. The etching patterns of enamel surfaces had a great variation. So, we could not find any correlation between etching pattern and bond strength. 4. The findings in this study indicate that in vitro reduction of the etching time to 5 seconds maintains clinically acceptable bond strength. However, further study is required to determine the cause of failure mode in 5, 10 and 15 seconds groups.

해안 저질토중 중금속과 유기물질의 오염에 관한 연구

최형일,정경훈,김인수,송영일 조선대학교 환경연구소 1994 環境公害硏究 Vol.11 No.-

The contents of heavy metals and total organics in bottom mud of the Mokpo marine have been investigated. This area was divided into three regions; Daebul, Mokpo, and Sanjung, and sampling sites region were selected by eight sites. Marine bottom mud mere investigated three times during this study and twenty-four samples are taken from eight sampling sites. Analytical species were Cdmium, Copper, Lead, zinc, Arsenic and total organics. The Heavy metals were analyzed by atomic absorption spectrophotometry, also total organics were analyzed by gravimetry. The major resurts of the studies were as follows: 1. The contents of the heavy metals and total organics in marine bottom mud were Cadium 0.272 mg/kg, Copper 3.384 mg/kg, Lead 9.647 mg/kg, zinc 10.031 mg/kg, Arsenic 0.636 mg/kg, Total organics 5.99 wt%. 2. The Zinc was higher than any other heavy metals in the marine bottom mud. The mean contents of heavy metals in Sanjung region was the lowest. 3. Lead and Arsenic species were influenced by the pollutants influxed from Youngsan River, and Cadium and Copper were less than it's contents of the natural soils. 4. The total organics in the marine bottom mud was exceedingly increased as the contrasted with the small particle size of the marine bottom mud, and the corelation coefficients between heavy metals and total organics were high. (0.5<r<0.8)

思春期前 兒童의 正常 鼻腔 通氣度에 관한 硏究

서정훈,장영일,양원식,남동석 대한치과교정학회 1992 대한치과교정학회지 Vol.22 No.1

This study was designed to analyze normal nasal respiratory resistance in prepubertal children. The subjects consisted of 30 prepubertal children(male:15, female:15).The mean age was 11.4 years in male children and 11.5 years in female children. The results were as follows: 1.The normal nasal respiratory patency was lower than the normal values from RION corp. 2.The normal nasal respiratory airflow rates showed no sexual differences. And there were no differences between inspiration and expiration. 3.Before and after use of nasal decongestants, there were no significant differences of normal nasal respiratory airflow rates and after the administration of nasal decongestants, nasal respiratory patency manifested lower variability. 4.The normal nasal respiratory resistance without nasal decongestants at 150 Pascal in inspiration was 0.30 Pa/cm³/sec(±0.07) and peak nasal inspiratory airflow rate was 1016.83cm³/sec(±223.89). 5.The normal nasal respiratory resistance with nasal decongestant at 150 Pascal in inspiration was 0.25 Pa/cm³/sec(±0.05) and peak nasal inspiratory airflow rate was 1148.33 cm³/sec(±234.29).

긴 관동맥병변에서 긴 스텐트삽입에 대한 임상경과 및 재협착율

김영학,박성욱,정상식,박훈기,이상곤,이일수,이철환,김재중,홍명기,박승정 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.6

Anti-inflammatory Activity of 1-docosanoyl Cafferate Isolated from Rhus verniciflua in LPS-stimulated BV2 Microglial Cells

Lee, Jae-Won,Cheong, Il-Young,Kim, Hae-Sung,Lee, Jae-Jun,Lee, Yong-Suk,Kwon, Yong-Soo,Kim, Myong-Jo,Lee, Hee-Jae,Kim, Sung-Soo,Chun, Wan-Joo The Korean Society of Pharmacology 2011 The Korean Journal of Physiology & Pharmacology Vol.15 No.1

Although various derivatives of caffeic acid have been reported to possess a wide variety of biological activities such as protection of neuronal cells against excitotoxicity, the biological activity of 1-docosanoyl cafferate (DC) has not been examined. The objective of the present study was to evaluate the anti-inflammatory effects of DC, isolated from the stem bark of Rhus verniciflua, on lipopoly-saccharide (LPS)-stimulated BV2 microglial cells. Pretreatment of cells with DC significantly attenuated LPS-induced NO production, and mRNA and protein expression of iNOS in a concentration-dependent manner. DC also significantly suppressed LPS-induced release of cytokines such as TNF-${\alpha}$ and IL-$1{\beta}$. Consistent with the decrease in cytokine release, DC dose-dependently and significantly attenuated LPS-induced mRNA expression of these cytokines. Furthermore, DC significantly suppressed LPS-induced degradation of IKB, which retains NF-kB in the cytoplasm. Therefore, nuclear translocation of NF-kB induced by LPS stimulation was significantly suppressed with DC pretreatment. Taken together, the present study suggests that DC exerts its anti-inflammatory activity through the suppression of NF-kB translocation to the nucleus.

Anti-inflammatory Activity of 1-docosanoyl Cafferate Isolated from <I>Rhus verniciflua</I> in LPS-stimulated BV2 Microglial Cells

Jae-Won Lee,Il-Young Cheong,Hae-Sung Kim,Jae Jun Lee,Yong-Suk Lee,Yong-Soo Kwon,Myong-Jo Kim,Hee Jae Lee,Sung-Soo Kim,Wanjoo Chun 대한생리학회-대한약리학회 2011 The Korean Journal of Physiology & Pharmacology Vol.15 No.1

Although various derivatives of caffeic acid have been reported to possess a wide variety of biological activities such as protection of neuronal cells against excitotoxicity, the biological activity of 1-docosanoyl cafferate (DC) has not been examined. The objective of the present study was to evaluate the anti-inflammatory effects of DC, isolated from the stem bark of <i>Rhus verniciflua</i>, on lipopoly</I>saccharide (LPS)-stimulated BV2 microglial cells. Pretreatment of cells with DC significantly attenuated LPS-induced NO production, and mRNA and protein expression of iNOS in a concentration- dependent manner. DC also significantly suppressed LPS-induced release of cytokines such as TNF-Ձ and IL-1Ղ. Consistent with the decrease in cytokine release, DC dose-dependently and significantly attenuated LPS-induced mRNA expression of these cytokines. Furthermore, DC significantly suppressed LPS-induced degradation of IKB, which retains NF-kB in the cytoplasm. Therefore, nuclear translocation of NF-kB induced by LPS stimulation was significantly suppressed with DC pretreatment. Taken together, the present study suggests that DC exerts its anti-inflammatory activity through the suppression of NF-kB translocation to the nucleus.

교정 치료 환자에 있어 항균 varnish 처치 전후의 타액 내 Streptococcus mutans 균주의 변화에 관한 연구

남동석,양원식,장영일,서정훈,정종평,김태우 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.3

Dental caries is one of the most prevalent dental diseases in Korea and its prevention is very important in orthodontic therapy. For the cleansing action of saliva itself and/or tooth-brushing is lowered in patient with fixed orthodontic appliance, oral hygiene of the patient becomes worse, which provides more favorable environment for micro-organisms. Chlorexidine, one of the series of bisguanide, has been reported to be strong antimicrobial agent and very effective on Streptococcus mutans. The purpose of this study is to evaluate the possibility of chlorhexidine as a anticariogenic agent in fixed orthodontic therapy. We used the varnish containing chlorhexidine as a main ingredient for the chemical control of salivary S.mutans in patients with fixed appliance therapy. We applied the varnish containing chlorhexidine on the labial and interproximal surface of the teeth before bonding and banding teeth of our patients(N=20) and compared to control group patients(N=20). Before the application of chlorhexidine varnish and four times periodically after the completion of fixed appliance set-up, we sampled saliva of both group patients and incuvate S.mutans for 24 hours. In the culture study of sampled saliva, counting the number of S.mutans colonies, we founded as follows : 1. In patients with fixed appliance therapy, the risk of dental caries increase when it compared to that of preorthodontic treatment ; The number of salivary S.mutans increase in patient's oral cavity. 2. The experimental agent that contain chlorhexidine is effective to reduce the number of salivary S.mutans. 3. For the effect of this agent is not ever-lasting, periodical application is needed, and additional study for economical interval and number of application is needed.