Factors associated with inflammatory change of epidermal cyst

( Jisang Yun ),( Kyung-nam Bae ),( Jin-hwa Son ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byungsoo Kim ),( Moon-bum Kim ),( Kihyuk Shin ) 대한피부과학회 2021 대한피부과학회 학술발표대회집 Vol.73 No.1

Background: Epidermal cysts (EC) are the most common tumors found on the skin and accompanying inflammation is also frequent. However, the predictors for inflammatory change have not been investigated yet. Objectives: This study was performed to investigate the difference between inflamed and uninflamed epidermal cysts, and to assess associated factors for inflammatory change. Methods: We analyzed the biopsy-proven 1723 epidermal cysts (515 inflamed and 1208 uninflamed) at two tertiary hospitals from 2011 to 2021. Results: The proportion of inflamed epidermal cysts (IEC) and uninflamed epidermal cyst (UIEC) were 29.9 % and 70.1 %, respectively. Inflammatory change was less frequently observed on the face (25.5 %) than the other sites (32.1 %) (p=0.0046). The anatomic location with the highest rate of inflammatory change was back (40.8 %, p=0.0004). Mean duration of inflammatory change from UIEC to IEC on the face was shorter than the other sites (12.5 months vs 17.9 months, respectively, p= 0.0473). On ultrasonography, long axis of IEC (20.7mm) was generally longer than that of UIEC (15.7mm) (p=0.0218). Moreover, Inflammatory change was more frequent on the EC with punctum compared to those without punctum (35.3 % vs 30.3 %, P=0.0471). Conclusion: Based on the location, size and presence of punctum, decision on the optimal treatment strategies can be established when encountering patients with EC.

FC 2-8 : Factors associated with inflammatory change of epidermal cyst

( Jisang Yun ),( Kyung-nam Bae ),( Jin-hwa Son ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byungsoo Kim ),( Moon-bum Kim ),( Kihyuk Shin ) 대한피부과학회 2021 대한피부과학회 학술발표대회집 Vol.73 No.-

Background: Epidermal cysts (EC) are the most common tumors found on the skin and accompanying inflammation is also frequent. However, the predictors for inflammatory change have not been investigated yet. Objectives: This study was performed to investigate the difference between inflamed and uninflamed epidermal cysts, and to assess associated factors for inflammatory change. Methods: We analyzed the biopsy-proven 1723 epidermal cysts (515 inflamed and 1208 uninflamed) at two tertiary hospitals from 2011 to 2021. Results: The proportion of inflamed epidermal cysts (IEC) and uninflamed epidermal cyst (UIEC) were 29.9 % and 70.1 %, respectively. Inflammatory change was less frequently observed on the face (25.5 %) than the other sites (32.1 %) (p=0.0046). The anatomic location with the highest rate of inflammatory change was back (40.8 %, p=0.0004). Mean duration of inflammatory change from UIEC to IEC on the face was shorter than the other sites (12.5 months vs 17.9 months, respectively, p= 0.0473). On ultrasonography, long axis of IEC (20.7mm) was generally longer than that of UIEC (15.7mm) (p=0.0218). Moreover, Inflammatory change was more frequent on the EC with punctum compared to those without punctum (35.3 % vs 30.3 %, P=0.0471). Conclusion: Based on the location, size and presence of punctum, decision on the optimal treatment strategies can be established when encountering patients with EC.

Derivation and verification of an aerosol dynamics expression for the below-cloud scavenging process using the moment method

Bae, Soo Ya,Jung, Chang Hoon,Kim, Yong Pyo Elsevier 2010 Journal of aerosol science Vol.41 No.3

<P><B>Abstract</B></P><P>An aerosol dynamics equation for the below-cloud scavenging process considering phoretic and electric charging effects in addition to the conventional mechanisms (the Brownian diffusion, interception, and impaction) is developed by using the moment method. Then, the dynamics of particle size distribution by the below-cloud scavenging process is calculated by using the developed equation and verified with the measurement data. The calculated particle size distribution changes are quite small compared to the measured changes. The calculated removal rate is smaller by 10<SUP>−2</SUP>–10<SUP>−3</SUP> than the measured data when only the conventional mechanisms are considered. With the extended mechanisms, the scavenging coefficient increases upto 20 times, mainly for the particle size range of 0.1μm<<I>d<SUB>p</SUB></I><3.0μm. However, the difference between the calculated and measured scavenging coefficient is still large, especially, for <I>d<SUB>p</SUB></I><0.1μm. Other possible scavenging mechanisms that might affect the below-cloud scavenging process such as coagulation and condensational growth of hygroscopic particles, turbulence, and updraft into cloud are discussed. It is recommended that further studies on wet scavenging process are needed.</P>

열화된 HK40 강의 마식특성에 관한 연구

김창훈,김엄기,전용두,이금배,남승훈,안병욱 한밭대학교 생산기반기술연구소 2003 생산기반기술연구소 논문집 Vol.3 No.1

The erosion behavior of artificially aged HK40 steel was invested. Erosion tests were conducted at room temperature, 200℃ and 400℃ using Al_2O_3 particles. Erosion rates increased with the increment of temperature. The maximum erosion rate appeared with the impingement angle of 30 degree. The erosion rate increased, reached the maximum at 1000 hours, and after that, decreased with the heat treatment time. The mechanism of erosion seems to be the cutting wear which is very much associated with the strength of material. As results, the erosion rates were rather affected by the tensile strength and the strain hardening coefficient than the hardness and the yield strength. Such changes of material properties would be caused by the change of micro-structure due to the precipitation of carbide and the dissolution of solid element within matrix during the heat treatment.

네트워크 텍스트 분석방법을 이용한 방과후학교 연구동향 분석

장창성(Jang, Chang Sung),배상훈(Bae, Sang Hoon),정영모(Jeong, Yeong Mo),김재형(Kim, Jae Hyeong) 한국방과후학교학회 2017 방과후학교연구 Vol.4 No.1

본 연구는 방과후학교 연구동향을 분석하고, 향후 연구과제와 방향에 대한 시사점을 제공하는데 목적이 있다. 한국교육학술정보원의 ‘학술연구정보서비스’를 이용하여 2004년부터 2016년 까지 방과후학교를 주제어로 하는 학술지 논문을 분석대상으로 하였으며, 분석대상 논문들의 연구주제, 연구방법, 연구대상을 빈도분석하고, NetMiner 5.0 프로그램을 사용하여 주제어에 대한 네트워크 텍스트 분석을 실시하였다. 주제어 분석은 정책 변동을 기준으로 시기별로 나누어 제시하였다. 빈도분석 결과 양적연구, 서술적연구, 질적연구, 혼합연구 순으로 다양한 연구가 이루어지고 있음을 발견할 수 있었다. 시기별로는 확산기(2004~2007)에 초등 돌봄 주제를 중심으로 하는 연구가 많았으며, 조정기(2008~2010)에 사교육관련 주제의 연구가 많았다. 내실화기(2011년 이후)에는 초등학교, 방과후학교 참여, 운영실태, 사교육, 학업성취 등을 주제로 하는 다양한 연구가 진행되었다. 연구결과를 종합해 보면 방과후학교 관련 연구가 연구 주제, 내용, 방법 측면에서 점차 다양해지고 활발해지고 있었다. 향후 연구방향에 대한 시사점으로 2008년 이후 방과후학교 정책 사업이 시도교육청으로 이양된 이후 학교 현장에 나타난 변화와 방과후학교 프로그램의 질 관리를 위한 연구 등에 대한 필요성을 제시하였다. The study aims to analyze the trends of after school research and to provide implications for future research tasks and direction. Using the Research Information Sharing Service of Korea Education & Research Information Service , we analyzed the academic papers with after school from 2004 to 2016. The research subjects, research methods, and subjects of the research articles were analyzed frequency and network texts analysis of the keywords using NetMiner 5.0 program. Key word analysis is divided by period according to policy change. As a result of frequent analysis, it can be found that various studies are conducted in the order of quantitative research, descriptive research, qualitative research, and mixed research. There were many studies focusing on primary care topics in the diffusion periods(2004~2007) and many researches on private education subjects in the adjustment periods(2008~2010). Various studies were conducted on subjects such as elementary school, after-school participation, operation, private education, and academic achievement in the strengthening period(since 2011). According to the results of the study, after-school researches have been increasingly diversified in terms of research subjects, contents and methods. This study suggests the necessity of research on the change of school after the after-school policy has been transferred to the school site since 2008. Also, it suggested the necessity of research for quality management of after-school program.

일측 폐이식 성견에서 혈역학과 체액조절 호르몬의 상관관계

서강석,박창권,송대규,배재훈,박원균 啓明大學校 醫科大學 2002 계명의대학술지 Vol.21 No.1

폐이식에 의한 체액이나 혈압의 변동 및 신경의 절단은 혈압 및 체액의 조절에 관여하는 호르몬의 분비에 영향을 미치리라 생각되어 좌일측 폐이식 시 이식폐에 분포하는 신경이 절단된 상태에서 폐이식 후 수용견의 혈역학적 변동이 ANP 및 ADH의 분비와 어떠한 상관관계가 있는지를 관찰하였다. 한국산 성견 12마리를 대상으로 좌일측 폐이식을 시행하였다. 공여폐의 보존은 low potassium dextrane glucose용액을 이용하여 10℃에서 20시간동안 보존한 다음 수용견에 이식하였다. 수용견의 좌측 폐를 적출하기 전과 후, 그리고 이식 후 재관류 30분, 2시간 후에 각각 혈역학 및 동맥혈 가스분압을 측정하였고, 동맥혈에서 ANP 및 ADH의 농도를 측정하였다. 동맥혈의 P_(O_2) 및 P_(CO_2)는 유의한 변동은 없었다. 대퇴동맥압을 재관류 후 30분에는 유의하게 감소하였고, 재관류 2시간 후에는 다소 회복세를 보이는 경향이었으며, 맥압은 비교적 유지되었다. 폐동맥압은 좌측폐 절제 시 이완기 폐동맥압은 변동이 없는 반면에 수축기 폐동맥압은 증가하였고, 재관류 시 폐동맥압은 어느 정도 회복되는 양상이었다. 심박출량은 좌측 폐절제 후에는 감소하였으며 재관류후에도 낮게 유지되는 양상이었다. 반면에 심박수는 유의한 변화없이 유지되었다. 전신혈관저항 및 폐혈관저항은 좌측 폐절제 후나 재관류 30분에 증가하였으며, 재관류 2시간 후 폐혈관저항은 회복되는 양상이나 전신혈관저항은 회복되지 못하였다. 혈중 ANP는 일측 폐절제 후 증가하였고, 재관류 후에는 점차 회복되는 양상을 보였고, ADH는 일측 폐절제 후, 30분에 증가한 후 회복되는 양상을 보였다. 동맥혈 ANP의 변동은 동맥혈 P_(O_2)및 P_(CO_2)와 상관관계를 보였고, ADH는 전신 동맥압의 변동과 상관관계가 있었다. 이상의 결과로 좌일측 폐이식 시에도 ANP 및 ADH는 혈역학적 변화와 연관하여 동맥압 및 체액의 조절에 생리적으로 관여하는 것으로 사료되며, ANP의 분비는 동맥혈의 저산소증 그리고 ADH의 분비는 동맥의 압수용기를 통한 신경성 조절의 영향을 받을 수 있는 것으로 생각된다. The purpose of this investigation was to study changes of plasma atrial natriuretic peptide (ANP) and antidiuretic hormone (ADH) in Korean mongrel dogs after a left single lung transplantation and to evaluate the correlation between hemodynamic factors and secretory responses of ANP and ADH. Arterial P_(O_2 and P_(CO_2) did not change significantly. Femoral arterial pressure decreased after 30 min of reperfusion and recovered slightly at 120 min, whereas pulse pressure did not change. After pneumonectomy, systolic pulmonary arterial pressure increased, whereas diastolic pulmonary pressure remained unchanged. Althought cardiac output fell following pneumonectomy and reperfusion, heart rate was unchanged. The secretion of plasma ANP initially increased follwoing pneumonectomy, but subsequently recoverd. In each subject, ANP values showed stronger correlation with arterial P_(O_2) than other hemodynamic parameters. The secretion of plasma ADH also initially increased (p<0.05) after 30 min of reperfusion and thereafter recoverd, showing the strongest correlation with mean femoral arterial pressure. The present results suggest that the secretion of ANP and ADH seem to be well regulated in accordance with hemodynamic changes after a single lung transplantation. Hypoxia and systemic arterial pressure are the prominent factors in the secretion of ANP and ADH, respectively.

Development of vitrification protocol in Rubia akane (nakai) hairy roots using a systematic approach.

Park, Sang-Un,Kong, Hyunjung,Shin, Dong-Jin,Bae, Chang-Hwan,Lee, Sheong-Chun,Bae, Chang-Hyu,Rha, Eui-Shik,Kim, Haeng-Hoon Royal Veterinary College 2014 Cryo letters Vol.35 No.2

<P>A solution-based vitrification protocol is a process of sequentially changing-solutions from which both influx of cryoprotectants (loading) and efflux of water (dehydration) were accomplished before cryo-exposure. Hence, we need to properly control the concentration /composition of the cryoprotectant solutions.</P>

상아질 접착제의 중합 시간 조절에 따른 복합레진의 중합 수축 방향의 변화

배지현,오명환,김창근,손호현,엄정문,조병훈,권혁춘 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.4

The purpose of this study was to evaluate the effect of adhesive curing timing on the direction of polymerization shrinkage of light-curing composite resin. In this study, the curing times of adhesive and composite resin were measured by differential scanning calorimeter(DSC). 28 extracted human molars were embedded in clear resin and box-type cavities were prepared. Based on DSC data. the experimental teeth were divided into 4 groups. Group 1: no bond: Group 2: late curing: Group 3: Intermediate curing: Group 4: Early curing. After treating with adhesive, the buccal cavities were filled with Z-100 hybrid composite resin and the lingual ones were filled with AEliteflo flowable composite resin. The depressions at the surface were measured by surface profilometer, then the specimens were embedded in clear resin and sectioned. Impressions were obtained and used to get epoxy resin replicas. The epoxy replicas were gold-coated and observed under SEM. Average Maximum Gap(AMG), Gap Proportion(GP), Average Marginal Index(AMI) were used to compare the shrinkage gap of each group. The results were statistically analyzed using the Kruskal-Wallis One Way ANOVA, Student-Newman-Keuls method. The results of this study were as follows. 1. Average Maximum Gap. Gap Proportion, Average Marginal Index and depression at the surface of Z-100 hybride composite resin were smailer than those of AEliteflo flowable composite resin(P(0.05) 2. When the bonding between composite resin and tooth structure was strong, the shrinkage gap was small, and depression at the surface was deep(P<0.05). 3. In the well-bonded group. light-curing composite resin shrank toward bonded cavity wall. not toward light source. The result suggested that the direction of polumerization shrinkage was affected by the quality of bonding in the dentin-resin interface. The strong was the bonding between composite resin and tooth structure, the smaller was the gap and the deeper was the depression at the surface. Then the flow to compensate the polymerization shrinkage proceeded from surface to bonded cavity wall.

계획된 행동이론을 적용한 사업장 여성근로자의 운동실천 차이 분석 : An Application of the Theory of Planned Behavior

배상수,이훈재,이창옥,조희숙 韓國保健敎育.健康增進學會 2003 보건교육건강증진학회지 Vol.20 No.1

The objectives of this study were to verify the determinants of regular exercise behavior in female worker by applying a modified Theory of Planned Behavior. The variables investigated for this study were health status, health concern, health habit, attitude (7 items), subjective norm (3 items), and perceived behavioral control( 5 items). Data was collected from 204 female workers using a self-administered questionnaire. The results of this study were as follows. 1) Regular exercise behavior was significantly influenced by perceived behavior control for time, pleasurable attitude, and the subjective norm of their colleagues. 2) A modified Theory of Planned Behavior is particularly useful in explaining exercise behavior of female workers. We suggest that health care providers should focus on not only attitude and social norms but also perceived behavioral control in order to improve the exercise behavior of female workers.

고 Mn-Cr 강의 조사손상에 미치는 전자선 조사 온도의 영향

배동수,정호신,강창용,남승훈,이해무 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.3

The effect of electron-beam irradiation temperature on irradiation damage of 12%Cr-15%Mn austenitic steel for structural material of nuclear and/or fusion reactors from the point of view of the reduced activation was investigated by using the 1,250 keV HVEM and an energy dispersed X-ray analyzer(EDX) in a 200 keV FE-TEM with beam diameter of about 0.5 nm. Void formation was not observed in irradiated specimen. The dislocation loop growth was observed and the density and size of dislocation loop were increased with irradiation dose. Irradiation-induced segregations of Cr and Mn at grain boundary were also observed by electron-beam irradiation condition. The amount of Mn segregation was increased with irradiation temperature, however, segregation phenomenon was disappeared in the case of Cr.