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산소부화연소에서 Co<sub>2</sub> 첨가에 대한 연소 특성
김한석,김호근,안국영,김용모,Kim, Han-Seok,Kim, Ho-Keun,Ahn, Kook-Young,Kim, Yong-Mo 대한기계학회 2004 大韓機械學會論文集B Vol.28 No.1
$CO_2$ is a well-known green house gas as well as the major source of global warming. Many researchers have studied to reduce $CO_2$ emission in combustion processes. Among the method for reducing $CO_2$ emission, oxygen-enriched combustion has been proposed. Because its adiabatic flame temperature is relatively too high, existing facilities must be changed or the flame temperature in the combustion zone should be reduced. The combustion characteristics, composition in the flame zone, temperature profile and emission gases were investigated experimentally for the various oxygen-enriched ratios(OER) by the addition of $CO_2$, under constant $O_2$ flow rate. Results showed that the reaction zone was quenched and broadened as the addition of $CO_2$ was increased. The emission of NOx in flue gas was decreased as decreasing temperature in reaction zone. It was also shown that the reaction was delayed by the cooling effect. As the addition of $CO_2$ was increased, the composition of CO in the flame zone was increased due to the increase of reaction rate by increasing mixing effect of oxidant/fuel at OER=0%, but the composition of CO was decreased by quenching effect at OER=50% and 100%.
연소용 공기중 $N_2$의 $CO_2$대체에 대한 연소특성 해석
김한석,안국영,김호근,이윤원,이창언,Kim, Han-Seok,Ahn, Kook-Young,Kim, Ho-Keun,Lee, Yun-Won,Lee, Chang-Eon 한국연소학회 2002 한국연소학회지 Vol.7 No.4
[$CO_2$] is a well-known greenhouse gas, which is the major source of global warming. Many researchers have studied to reduce $CO_2$ emission in combustion processes. The central method of low $CO_2$ emission is Oxygen/CxHy combustion. Theoretically Oxygen/CxHy combustion only produces $CO_2\;and\;H_2O$ and allows convenient recovery of $CO_2$. The combustion characteristics, flame stability, composition in the flame zone and temperature profile were studied experimentally for various compositions of oxidant by substituting $CO_2\;for\;N_2$ with the constant $O_2$ concentration. Results showed that flame became unstable due to the high heat capacity, low transport rate and strong radiation effect of $CO_2$ in comparison with those of $N_2$. The reaction zone was quenched and broadened, as the ratio of $CO_2\;to\;N_2$ was increased. The emission of NOx in flue gas decreased due to the decreased temperature of the reaction zone. As the conversion ratio of $CO_2\;to\;N_2$ was increased, the emission of CO and the higher temperature zone increased due to decrease of reaction rate by the a quenching effect.
공기 다단 분무연소기의 NOx 발생특성에 관한 실험적 연구
김한석,안국영,김호근,백승옥,Kim, Han-Seok,An, Guk-Yeong,Kim, Ho-Geun,Baek, Seung-Ok 한국기계연구원 2001 硏究論文集 Vol.31 No.-
An experimental investigation on the reduction of nitrogen oxide emission from swirling, turbulent diffusion flames was conducted using multi air staged combustor, The combustor utilizes swirler to dampen fuel/air mixing, allowing an extended residence time for fuel pyrolysis and fuel-N conversion chemistry in an locally fuel-rich environment prior to burnout. This process also allow to reduce thermal NOx formation to lessen the temperature of reaction zone. The aerodynamic process therefore emulates the conventional staged combustion process, but without the need for the physically separate fuel-rich and -lean stages. Parametric studies on the ratios of each staged air and droplet size were carried out the feasibility of fuel/air mixing for low NOx combustion with diesel and pyridine mixed diesel fuel oil.
동축 공기다단 LPG화염의 NOx 생성특성에 관한 연구
김한석,안국영,김호근,유명종,백승욱,Kim, Han-Seok,Ahn, Kook-Young,Kim, Ho-Keun,Yu, Myung-Jong,Baek, Seung-Wook 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2
Experimental and numerical studies have been done to examine the effects of excess air ratio and tertiary air swirl number on the formation characteristics of NOx in a pilot scale combustor adopting a multi-air staged burner. In numerical calculation the mathematical models for turbulence, radiation and nitric oxide chemistry were taken into account. The radiative transfer equation was solved using the discrete ordinates method with the weighted sum of gray gases model. In the NOx chemistry model, the chemical reaction rates for thermal and prompt NOx were statistically averaged using a probability density function. The results were validated by comparison with measurements. For the experiment, a 0.2 MW pilot multi-staged air burner has been designed and fabricated. Using the numerical simulation developed here, a variation of thermal and prompt NOx formation was predicted by changing the excess air ratio and tertiary air swirl number. As the excess air ratio increased up to 1.9, the formation of the total as well as thermal NOx at exit increased while the prompt NOx decreased. The formation of thermal NOx was more affected by concentration of $O_2$ and $N_2$ than gas temperature. When the tertiary air swirl number increased, the formation of the total as well as the prompt NOx slightly decreased.
타액선 종양에서 종양증식 관련인자 발현에 관한 면역조직화학적 연구
김한석,김성민,박영욱,Kim, Han-Seok,Kim, Soung-Min,Park, Young-Wook 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.5
Objective : Lots of papers have revealed that tumor growth related factors such as EGF, EGFR, c-erbB-2 play an important role in tumorigenesis and proliferation. These factors are found in most tumors of ectodermal origin. But, documentations of tumor growth related factors on salivary gland tumors were rare. Therefore, we determined expressions of tumor growth related factors; PCNA, p53, EGF, EGFR, cerbB2(HER-2), Maspin, DMBT-1, N-Ras in representative salivary gland tumors. Materials and methods : A few types of salivary tumors were examined by immunohistochemical assays. Each antibody was applied to specimens of tumors. Specimens were composed of 5 pleomorphic adenomas (PA), 3 mucoepidermoid carcinomas (MEC), 2 adenoid cystic carcinomas (ACC) and 2 squamous cell carcinomas (SCC) from 12 patients. One specimen was selected randomly as negative control. For evaluation of staining intensity, each stained sample was divided into 5 grade; no staining, obscure, weak staining, moderate staining, strong staining. Results : Strong expressions of PCNA were found in all tumors except of PA. EGF was expressed strongly in SCC, ACC sequently. But in both PA and MEC, EGF expression was weak. EGFR and c-erbB-2 expression showed similar patterns in all salivary gland tumor tissues. P53 showed weak expression generally in all salivary gland tumors. DMBT-1 was expressed in SCC rather than in ACC or in MEC. N-Ras showed weak expressions in all salivary gland tumors except of squamous cell carcinoma. Conclusion : Taken together, tumor growth related factors were expressed in salivay tumors as well as mucosal squamous cell carcinoma. Especially EGFR and c-erbB-2 could be candidates as diagnostic markers for estimating clinical grade of salivary gland tumors. But further studies with reliable methods will be needed to confirm the results of this study.
김한석,안국영,이상민,장병록,Kim, Han-Seok,An, Guk-Yeong,Lee, Sang-Min,Jang, Byeong-Rok 한국기계연구원 2004 硏究論文集 Vol.34 No.-
An Experimental study on the characteristics of high pressure gas quenching system was carried out in the present study. The characteristics of gas quenching system have been studied with high pressure gas chamber and specimen for various gas pressure and velocity which are the design parameter of quenching system. The quenching gas was used compressed air which properties are very similar with Nitrogen gas usually used in industrial gas quenching system. The result shows that the quenching rate of mid surface of specimen is lower than each ends of them which are close to low temperature quenching surface. And to increases the quenching intensity, the increment of quenching gas pressure is more efficient than the increment of quenching gas velocity at the point of reducing the circulation fan power.
Recurrent Herpes-Stomatitis Mimicking Acute Necrotizing Ulcerative Gingivitis
김한석,이석근,박영욱,Kim, Han-Seok,Lee, Suk-Keun,Park, Young-Wook Korean Association of Maxillofacial Plastic and Re 2011 Maxillofacial Plastic Reconstructive Surgery Vol.33 No.1
Herpes simplex is caused by viruses of the herpesvirus hominus family. HSV have four categories: type 1, 2, 6, and 8. Generally HSV-1 affects the mouth. Once infected by HSV, the person's infection is permanent. Retrograde transport through adjacent neural tissue to sensory ganglia leads to a lifelong latent infection. Recently, we treated a patient with recurrent herpes-stomatitis mimicking acute necrotizing ulcerative gingivitis (ANUG). The results were satisfactorty so we report this case. 31 years old male patient showed sore throat, gingival ulceration, palpable both submandibular lymph node, and sulcular pus formation around posterior decayed teeth. This is the third time he has suffered from this symptom. Tentative diagnosis was acute necrotizing ulcerative gingivitis. Antibiotic therapy was started. But, intraoral symptom got worse in process of time. Especially ulcer of marginal gingiva got worse. Viral disease was suspected. We carried out viral cultivation. At the same time topical application of antiviral ointment (herpecid$^{(R)}$) was performed on oral ulcer unilaterally for the purpose of diagnosis and reducing pain experimentally. The next day pain was decreased dramatically on application area. Basing on the viral cultivation and clinical effect of antiviral ointment (herpecid$^{(R)}$), we have diagnosed it as a recurrent herpes-stomatitis and concluded that viral infection was major cause of disease and bacterial infection was secondary.