부산지역 산성강우의 장기적인 화학적 성상의 변화

황성욱,전보경,김찬훈,서정민,최금찬 동아대학교 환경문제연구소 2001 硏究報告 Vol.24 No.1

It is important to know the impacts of acid rain because of soil acidification, reduced biological productivity. Many researchers were interested in regional acid problems, and former research were focued in short-term trends of acid rain. It is not easy to evaluate acid rain problems because of many parameters relating to meteorological factors, which are wind, temperature, humidity and other factors. Rainfall sampling for this study was done from September 1933 to December 2000 in Dong-A University, Busan. All Samples were collected in separately to early fraction and succeeding fraction. Also, the samples were measured for pH, and EC, cations and anions were analysed by ion Chromatography.

UV 광산화 공정 및 광촉매 공정을 이용한 벤젠 및 톨루엔 가스의 처리

황철원,전보경,김찬훈,서정민,최금찬 동아대학교 환경문제연구소 2003 硏究報告 Vol.25 No.2

Volatile organic compounds (VOCs) are widely used in both industrial and domestic activities. This extensive use results in adverse effect in aquatic, soil and atmospheric environments. Conventional methods for treating VOCs from gas streams, such as absorption, adsorption, condensation and thermal /catalytic incineration all have their inherent limitations and none are definitely cost-effective to treat emissions from the small workplace such as architectural coating, printing, and dry cleaning. In this study, photooxidation-photocatalytic oxidation process was applied in the decomposition of VOCs and benzene and toluene, typical VOCs in industrial area, which were adapted as experimental gases. In photooxidation process, the decomposition efficiency of benzene and toluene was evaluated by varying different conditions, such as UV output, flowrate and background gas. The results showed that the decomposition efficiency of benzene and toluene increased considerably with increasing UV output and retention time. In case of background gas, the decomposition efficiency in standard air was higher than that in nitrogen. In photooxidation-photocatalytic oxidation process, the decomposition efficiency was higher than that in photooxidation process and the concentration of ozone generated from photooxidation reactor was drastically decreased after photocatalytic oxidation process. From this study, the results indicate that photooxidation-photocatalytic oxidation process is ideal for treatment of benzene and toluene from the small workplace. But further process optimization must be achieved to apply this process in workplace.

엔진 구동형 니켈 티타늄 파일을 이용한 거터퍼쳐의 제거 효과

전정훈,민정범,황호길 大韓齒科保存學會 2004 Restorative Dentistry & Endodontics Vol.29 No.3

The purpose of this study was to quantify the amount of remaining gutta-percha/sealer on the walls of root canals when three types of nickel-titanium rotary instruments(Profile, ProTaper and K³) and a hand instrument (Hedstrom file) used to remove these materials. The results of this study were as follows: 1. In the total time for gutta-percha removal, Profile group was the fastest and followed by K³, Protaper, Hedstrom file group. 2. In case of the evaluation of the volume of remained gutta-percha from radiograph, K³group got the highest score and followed by Protaper, Hedstrom file, Profile group in the apical 1/3. 3. In case of the evaluation of the volume of gutta-percha remained from stereomicroscope, K³ group got the highest score and followed by Protaper, Hedstrom file, Profile group in the apical 1/3. These results showed that instrumentation using nickel-titanium rotary instrument groups was faster than that using hand instrument group. The effect of gutta-percha removal using Profile group was better than that using Protaper and K³ group in the nickel-titanium rotary instrument groups.

재근관치료를 통한 치근단 병소의 치유

전정훈,이연재,황호길 조선대학교 구강생물학연구소 2002 Oral Biology Research (Oral Biol Res) Vol.26 No.2

The cases of two patients with large periapical lesions are presents. Most of the periapical lesions formed as a result of improper endododtic treatment. Following conservative nonsurgical endododtic retreatment, there was resolution of the periapical lesion and clinical symptom. These results suggest that the sizes of a periapical lesion dose not mandate its surgical removal and even periapical lesions heal fellowing conservative nonsurgical endododtic retreatment.

개에서 이중 결찰법을 통한 동맥관 개존증의 완치 예

윤헌영,정순욱,박희명,박철,정만복,김준영,한현정,황민,노병국,박상혁,장하영,박정윤 한국임상수의학회 2004 한국임상수의학회지 Vol.21 No.1

A ten months old, female Yorkshire terrier weighing 2.88 kg referred to veterinary teaching hospital of college of veterinary medicine, Konkuk University because of syncope, cough and dyspnea. First hematological and serum chemical test revealed thrombocytopenia, mild anemia, and increase of concentration of ALP (195 U/L). On 57 days later, second hematological and serum chemical test revealed polycythemia, increase of concentration of ALP (211 U/L), and Tchol (387 mg/dl). Right atrium enlargement, main pulmonary artery bulge and cardiomegaly (VHS = 11.5) were observed in radiographic findings. Ultrasonographic images showed both right and left ventricular dilation and turbulent flow between the descending aorta and the main pulmonary artery in color Doppler imaging. ECG showed left ventricular enlargement, SA block, and electrical alternant. Thoracotomy was performed through left fourth intercostal incision under isoflurane anesthesia. Patent ductus arteriosus was double ligated with 1-0 silk. Cough and dyspnea disappeared on 5 days after operation. Turbulent flow was not found in color doppler imaging of ultrasonography on 10 days after operation. Ten months later after the operation, syncope could not exist any more.

인공 치아우식 발생 모델에서 디지털 방사선 공제술을 이용한 인접면 치아우식증의 진단

박정훈,최용석,황의환,이기자,최삼진,박영호,김경숙,진현석,홍경원,오범석,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.1

Purpose : The purpose of the experiment was to evaluating the diagnostic ability of dental caries detection using digital subtraction in the artificial caries activity model. Materials and Methods : Digital radiographies of five teeth with 8 proximal surfaces were obtained by CCD sensor (Kodak RVG 6100 using a size #2). The digital radiographic images and subtraction images from artificial proximal caries were examined and interpreted. In this study, we proposed novel caries detection method which could diagnose the dental proximal caries from single digital radiographic image. Results : In artificial caries activity model, the range of lesional depth was 572-1,374 μm and the range of lesional area was 36.95-138.52mm². The lesional depth and the area were significantly increased with demineralization time (p<0.001). Furthermore, the proximal caries detection using digital subtraction radiography showed high detection rate compared to the proximal caries examination using simple digital radiograph. Conclusion : The results demonstrated that the digital subtraction radiography from single radiographic image of artificial caries was highly efficient in the detection of dental caries compared to the data from simple digital radiograph.

서울의 Penicillinase Producing Neisseria gonorrhoeae 발생빈도(1998)

김재홍,김준호,반재용,이정우,황성주,정준규,정성태,강진문,조흔정,홍창의,정혜신,이한승,김이선,이봉길,이종호,선영우,한기덕,윤성필,이성훈,안종성,박석범,문승현,조항래,김형섭,류지호,황재영,박준홍,손상욱 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.1

In recent years, gonorrhea has been pandemic and remains one of the most common STDs in the world, especially in developing countries. For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria gonorrhoeae(PPNG), we have been trying to study the patients who have visited the Venereal Disease Clinic of Choong-Ku Public Health Center in Seoul since 1980 by menas of the chromogenic cephalosporin method. In 1998, 93 strians of N. genorrhoeae were isolated, among which 60(64.5%) were PPNG. The prevalence of PPNG in Seoul, which had been decreased to 39% in 1996 after a peak of 74.3% in 1993, is increased to 64.5% in 1998.

방사선사진의 인덱스-순서 분석을 통한 치아경조직의 탈염화 검출

박동현,박영호,김경숙,박정훈,이기자,최삼진,최용석,황의환,박헌국 대한구강악안면방사선학회 2009 Imaging Science in Dentistry Vol.39 No.2

Purpose : The purpose of this study was to develop the radiographic technique for detecting the demineralization which is known as indication of dental caries. Materials and Methods : This technique was based on the comparing of multiple radiographs which was irradiated by multiple X-ray spectra. For the meaningful comparing, the multiple radiographs were reconstructed to the dosimetrically consistent images using a standard material. The difference of resulting images of same target with multiple spectra represents the difference of response of material as regards the spectra. Results : We have found about 10% of demineralization of dental hard tissues particularly in the proximal region through the analyzing of differences. Conclusion : Most intriguing thing in this investigation was that the method to analyze difference shows us to an anatomic structure of dental hard tissues even if absolute values of optical density were excluded during the procedures.

정상면역을 가진 환자에서 발생한 복부대동맥의 진균 감염성동맥류 1예

이호영,김태형,추은주,전민혁,이은정,정은정,전성란,박의주,염욱,장원호,황정화,김동훈,김동원 대한감염학회 2008 감염과 화학요법 Vol.40 No.3

감염성동맥류는 드물지만, 치명적인 질환이다. 진성 진균성 감염성동맥류는 더 드물게 발생한다. 진균감염은 사망률과 이환율이 매우 높다. 그러나 증상이 비특이적이고 일반적인 진단방법으로는 민감하게 진단이 되지 않기 때문에 종종 진단이 어렵다. 저자들은 면역이 정상이고 다른 위험인자가 없는 환자에서 복부대동맥에 발생한 진균성 감염성동맥류를 경험하여 이를 보고한다. 컴퓨터 단층촬영과 혈관 수술에 기초하여 진단하였으며, 수술 후 조직배양에서 균이 동정되지는 않았으나 절제한 혈관조직에서 칸디다 감염을 시사하는 발아가 있는 효모균이 관찰되었다. 한국에서 1988년에서 2007년까지 복부에 발생한 감염성동맥류 17증례를 고찰하였을 때 진성 진균성 감염성동맥류는 없었으며, 저자들이 경험한 것이 복부에서 발생한 진균감염성 동맥류로는 첫 증례이다. Infected aneurysms are uncommon, frequently fatal lesions. "True" fungus-infected aneurysms are even rarer. Fungal infections have high morbidity and mortality. However, diagnosis is frequently difficult, since the symptoms are non-specific and standard diagnostic procedures are often insensitive. We experienced a patient with persistent fever and negative blood cultures. The patient was immunocompetent and had no risk factors, and was diagnosed with a fungus-infected aneurysm based on computed tomography and vascular surgery. The vascular tissue revealed some narrow-based budding yeast within the thrombus, suggesting Candida infection. Seventeen cases of infected aneurysm of the abdomen were reported in Korea from 1988 to 2007, although none were "true" fungus-infected aneurysms, making this the first fungus-infected aneurysm of the abdomen in Korea. Prompt diagnostic procedures and aggressive treatment modalities are necessary for patients with occult infection and negative blood cultures, regardless of their immunocompetence, because of the high morbidity and mortality of this condition.

Effect of Various Light Quality on Seedlings of Platycodon grandiflorum and Codonopsis lanceolata

Jeong Hun Hwang,Jeong Kil Koo,Eun Won Park,Hee Sung Hwang,Hyeong Eun Choi,Jin Yu,Ji Hye Yun,So Yeong Hwang,Seung Jae Hwang 한국원예학회 2023 한국원예학회 학술발표요지 Vol.2023 No.10