가토 악하선 도관 결찰과 절단 후 악하선 세포의 증식에 관한 전자 현미경 및 면역조직화학적 연구

한승우,김경욱,이재훈,Han, Seung-Woo,Kim, Kyung-Wook,Lee, Jae-Hoon 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.4

Obstructive sialadenitis of major salivary glands is a common entity that occurs either in sialolithiasis or in foreign-body obstruction of the excretory ducts. This is characterized histologically by the presence of duct-like structural groups in a highly fibrotic stroma. Although the pathologic features are well recognized, the various cell types involved in the atrophy and subsequent regeneration of the obstructed salivary gland have been controversial. For this reason, an animal model of obstructive sialadenitis that induced atrophy in the salivary gland was used. Experimental study was performed to observe changes of submandibular gland in rabbit and apply the results to clinical activity. Forty-five rabbits each weighing about 3Kg were used and divided into control and experimental group. In the experimental group, ducts of submandibular gland was ligated and cutted divided into each twenty rabbits. Rabbits were serially sacrificed on the 3rd, 5th, 14th, 30th day of experiment. The submandibular glands were dissected out at sacrifice and stained with H&E, MT, immunohistochemical stain and the histological examinations were carried out under the light and transmission electron microscope. After examination and comparison of all specimens, the results of this study were as follows: 1. In the features of H&E stain, moderate infiltration of inflammatory cell were present at 3rd day of experiment. The features of ductal metaplasia was observed after 7th day in the ligation group and destructive changes was continued. In the cutting group, atrophic changes were less severe than ligation group but the small ductule were separated from stroma after 7th day. 2. In the feature of MT stain, apposition of connective tissue was increased in all group, more active in ligation group. 3. In the features of immunohistochemical stain, ligation group showed increased PCNA positive response at 7th day and the higher activity of duct cells was observed. Severance group showed more PCNA positive response than ligation group at 30th day. 4. In TEM features, ductal metaplasia was started at 7th day and degenerative change with margination of nucleus had been severe. Although ductal metaplasia was seen in the severance group, more numerous granule in different size was founded than ligation group. From above results, degenerative change was identified with ductal metaplasia, apically apposition of granule, r-ER destruction in ligation group. Severance of duct elicit degenerative change of grandular cells but the change was less severe than ligation group and more PCNA positive cell was founded at acinar cell.

Al(III) 응집제의 염기도에 따른 총인 제거효율의 변화

한승우,이철희,이재관,강임석,Han, Seung-Woo,Lee, Chul-Hee,Lee, Jae-Kwan,Kang, Lim-Seok 대한상하수도학회 2012 상하수도학회지 Vol.26 No.2

염기도를 달리하여 제조된 PACl에 대한 Al(III)종 분포는 염기도가 높을수록 monomeric Al(III)종은 적어지고, precipitate Al(III)종은 증가하는 것으로 나타났다. 염기도 13.6%의 경우에서는 monomeric Al(III)종이 81%, polymeric Al(III)종이 19%, precipitate Al(III)종은 0%로 monomeric Al(III)종이 주종을 이루고 있었다. 염기도 13.6%의 경우에서 재안정화 없이 80% 정도의 탁도제거 효율을 유지하고 있었으며, $UV_{254}$ 제거효율이 향상되는 것은 낮은 응집 pH 범위에서 유기물 응집효과가 우수하게 나타나기 때문으로 판단된다. 그리고 13.6% 염기도를 가진 PACl이 T-P 제거효율 및 $PO_{4}-P$의 제거효율이 가장 우수한 것으로 나타났으며 이는 높은 monomeric Al 성분에 기인하리라 판단된다. The analysis of Al (III) hydrolysis species with PACls prepared by different basicity showed that mononmeric Al species were reduced while precipitate Al species were increased with an increase in basicity for PACls. In the case of the PACl with 13.6% basicity, monomeric Al species were 81%, polymeric Al (III) species 19%, precipitate Al (III) species was 0%, as showing the dominant monomeric Al species. The PACl with 13.6% basicity showed above 80% of turbidity removal efficiency without any restabilization. In addition, the PACl with 13.6% basicity showed higher organic removal expressed by $UV_{254}$ which was caused by lower coagulation pH. The PACl containing the higher amount of monomeric Al species was the most beneficial for T-P and $PO_{4}-P$ removal.

자기소개서 쓰기에 관한 선행연구 고찰

한승우(Han, Seung-woo) 다빈치미래교양연구소 2015 교양학연구 Vol.0 No.2

The purpose of this study was to review research on writing self‐introduction has been teaching at the university. First, the analysis of past studies and organize meaningful. And, each of the studies that have analyzed the meaning and limitations. I think the purpose of this study should move forward in the study self-introduction writing. The self-introduction could be recognized as a writing class in university because various efforts of many researchers. We must think of the meaning of enlightenment and self-introduction to a variety of teaching methods. Self‐introduction is because me becoming increasingly important. I want to be a great study of researchers continued.

코로나19 이후 대학 온라인 교육에 관한 학습자들의 반응 조사 연구

한승우(Han, Seung-Woo),김보영(Kim, Bo-young) 한국문화융합학회 2020 문화와 융합 Vol.42 No.10

본 연구는 ‘자발적’ 온라인 수업과 ‘비자발적’ 온라인 수업에 대한 학습자들의 만족도를 비교하고, 유형별 온라인 수업(동영상 및 ZOOM)에 관한 만족도를 함께 조사하여 제시하고 있다. ‘자발적’으로 온라인 수업에 참여한 학생들이 ‘비자발적’으로 온라인 수업에 참여한 학생들에 비해 자기주도학습, 학습몰입, 만족도, 학습지속의향 모두에서 더 높은 평균값을 보였다. 즉 자발적으로 참여한 학생들이 비자발적으로 참여한 학생들보다 만족도와 학습효과가 더 높게 나타난 것이다. 또한, 셀프 스튜디오와 ZOOM 수업 모두에서 ‘학습지속의향’이 전반적으로 높게 나타났으며, 그 중에서도 ZOOM 수업이 더욱 높은 수치를 보였다. 학습자들이 온라인 수업에 대해 비교적 높은 호응과 만족도를 가지고 있는 것으로 보이는 대목이다. 동영상 강의는 반복해서 듣는 데 효과적인 것으로 나타났으며, ZOOM은 온라인 수업에서 소통을 가능하게 하는 장점을 증명하였다. 온라인 수업과 대면 수업이 결합할 경우, 이러한 결과를 반영하여 효과적인 수업 방안을 모색할 수 있을 것으로 본다. 팬데믹 이후의 대학 교육에는 많은 변화가 올 것으로 예상된다. 그러나 절차 없는 변화에는 많은 혼란과 시행착오의 위험이 도사리고 있다. 학습자들의 의사를 수렴하고, 그것을 충분히 반영하여 혼합형 수업 방안을 모색해야 한다. 대면 수업이 긴 세월을 통해 노하우를 축적해 왔듯이, 이제 새롭게 도입되는 온라인 수업 역시 많은 시간을 두고 단계별 변화를 이루어가야 할 것이다. This study conducted a survey on the satisfaction level of learners regarding “non-voluntary” and “voluntary” online classes, and their satisfaction level regarding online class (video and zoom) among the many current methods of online class. Students who participated in online classes voluntarily showed higher average values in all of the self-directed learning, learning commitment, satisfaction, and willingness to continue learning than students who participated in non-voluntary online classes. This means that students who participated voluntarily showed higher satisfaction and learning effect than students who participated involuntarily. In addition, in both self-studio and ZOOM classes, the “will to continue learning” was generally high and, among them, the ZOOM class showed a higher number. This is the point on which the learners seemed to have relatively high response and satisfaction toward online classes. Video lectures were found to be effective in listening repeatedly, and ZOOM stood out in terms of enabling communication in the online classes. If online classes are applied in face-to-face classes, it is expected that effective class plans can be developed based on these results. It is expected that much change will enter university education after the pandemic. However, there is much confusion and risk of trial and error in change without procedure. It is necessary to collect the various opinions of learners and fully reflect them to seek a hybrid class plan. Just as face-to-face classes have accumulated know-how over the years, the newly introduced online classes will also take time to make gradual changes.

콘크리트 교량상판의 효과적인 유지관리를 위한 의사결정시스템 모델링

한승우(Han Seung-Woo),김정욱(Kim Jung-Wuk),홍태훈(Hong Tae-Hoon),이상엽(Lee Sang-Youb) 대한토목학회 2005 대한토목학회논문집 D Vol.25 No.6D

연구논문 : 우리나라 손해보험회사의 현황과 경영평가에 대한 고찰

한승우 ( Seung Woo Han ) 한국재무관리학회 2011 財務管理論叢 Vol.17 No.1

이 연구의 목적은 우리나라 손해보험 회사의 현황을 살펴보고, 회귀분석과 비율분석을 사용하여 경영평가를 측정하였다. 손해보험회사의 설립일은 양 90년 전부터 1945년 전에 설립되었다. 최초로 설립된 손해보험회사는 메리츠화재(주)(구 동양화재)로 1922년에 설립되었으며, 1968년에 설립된 동부화재 보다 대략 평균적으로 50년의 역사를 더 가지고 있다. 일반 투자자들에게 상장한 연도는 양 55년 전부터 22년 전에 상장하였다. 역시 메리츠화재(구 동양화재)가 1956년에 최초로 상장하였으며, 현대화재가 1989년에 상장되어 동양화재가 현대화재보다 평균적으로 30년 전에 상장하였음을 알 수 있다. 9개의 손해보험회사 경영 자료를 가지고 실증 분석 하였다. 회귀분석 결과 DMU4와 DMU5가 다른 DMU보다 상대적으로 효율적인 DMU임을 알 수 있었다. 그리고 비율 분석을 종합하여 본 결과 DMU5가 활동성과 안전성에서 좋은 결과를 보여 주었고, DMU6은 시장성에서 좋은 결과를 보여 주었다. 성장성은 DMU5와 DMU3이 좋은 결과를 보여 주었고, 수익성은 DMU6과 DMU7이 좋은 성과를 보여 주었다. 대체적으로 DMU5와 DMU6이 좋은 DMU로 평가 되고 있다. 이상의 결과를 종합하여 보면 순위 출현 빈도에 의하여 DMU5, DMU6, DMU7의 순으로 경영서오가각 좋음을 알 수 있다. 반면에 DMU4, DMU3, DMU6의 순서로 경영성과가 나빴음을 알 수 있다. 특히 DMU6은 좋은 성과와 나쁜성과 순위에 각각 마지막으로 선정되어 다른 DMU보다 특이함을 알 수 있다. The purpose of this study, we examine the current state of the country non-insurance companies, and the ratio of the regression analysis were used to evaluate the business. The establishment of non-insurance company about 90 years ago, was founded 45 years ago. Founded as the first casualty insurance company Meritz Fire (formerly the Oriental fire) was founded in 1922 as in 1968, established the approximate average over east fires have more than 50 years of history. Publicly listed retail investors, the year about 55 years to 22 years ago was traded. Also Meritz Fire (formerly the Eastern fire) have been listed for the first time in 1956, Hyundai is traded in 1989. Nine insurance companies have the management resources were empirical analysis. DMU5, DMU4 regression analysis and efficient relative to other DMU. And the rate by a comprehensive analysis of the activity and safety of DMU5. The results show a good result gave, DMU6 showed good results in the market. Growth potential and DMU3, DMU5 gave good results show, profitability and DMU7, DMU6 showed a good performance. DMU6, DMU5 generally are regarded as good. Look to the combination of the above results by rank occurrences DMU5, DMU6, DMU7 order of business is in good standing can be seen five. On the other hand, DMU4, DMU3, DMU6 nappateumeul in the order of business performance can be seen. In particular, good performance and bad performance DMU6 each finally selected in order of specificity can be seen that more than any other DMU.

수처리용 Fe(III)계 응집제의 특성 및 응집특성 비교

한승우(Seung Woo Han),강임석(Lim Seok Kang) 大韓環境工學會 2016 대한환경공학회지 Vol.38 No.4

수처리용 응집제로서 미리 가수분해시켜 고분자성 Fe(III)의 이용과 제조에 대한 연구에서, Ferron 분석법을 통해 Fe(III) 응집제내에 함유된 가수분해종을 정량화하고 그 차이를 살펴보았다. 제조된 PICl (polymeric iron chloride) 중에서 r=1.5의 경우에서 가장 많은 20%의 고분자성 Fe(III)종을 함유하고 있는 것으로 나타났다. 응집 실험은 r 값에 따라 제조된 응집제를 이용하여 응집제 주입량과 응집 pH의 조건을 달리하여 수행하였다. FeCl₃ (r=0.0)와 PICl (r=0.5, 1.0, 1.5)를 이용한 응집 특성 비교에서, PICl (r=0.5, 1.0, 1.5)에서 FeCl₃ (r=0.0) 보다 유기물 제거에 효과적인 것으로 나타났다. 응집 pH에 따른 응집 실험에서도 PICl의 경우에서 pH에 대한 영향이 적게 나타났으며, 폭 넓은 응집 pH(pH 4-9)에서 탁도와 유기물 제거효율이 높은 것으로 나타났다. This research explored the feasibility of preparing and utilizing preformed polymeric solution of Fe(III) as coagulants for water treatment. The differentiation and quantification of hydrolytic Fe(III) species in coagulant was done by utilizing spectro-photometric method based on the interaction of Fe(III) with Ferron as a complexing agent. The properties of the synthesized polymeric iron chloride (PICl) showed that the quantity of polymeric Fe(III) produced at r=1.5 was 20% of the total iron in solution, as showing maximum contents. Coagulation experiments were conducted under the condition of various coagulant doses and pH for each coagulant prepared. From the comparison of the characterization of coagulation for FeCl₃ (r=0.0) and PICl (r=0.5, 1.0, 1.5) coagulants, PICl (r=0.5, 1.0, 1.5) coagulants was found to be more effective than other coagulant for the removal of organic matters. The experimental results for the coagulation tests at various pH ranges showed that the PICl was least affected by the coagulation pH and PICl was very effective for the removal of turbidity and organic materials over wide pH range (pH 4-9) tested.

PACl 응집제의 특성 및 기타 Al ( 3 ) 계 응집제와의 응집특성 비교

한승우(Seung Woo Han),강임석(Lim Seok Kang) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.3

Various Al(Ⅲ) solutions having different r (OH_(added)/Al) values and chemical species compositions were prepared and physical arid chemical characteristics of PACls solutions were examined. Then, the prepared PACls were compared with other Al(Ⅲ) coagulants for coagulation characteristics in water treatment process. The addition of NaOH to the supersaturated AlCl₃ solutions made it possible to synthesize the different types of PACls useful for water treatment. The result of the analysis by timed spectrophotometer with a color developing reagent (ferron) showed that r (OH_(added)/Al), initial aluminum concentration, and base concentration significantly influenced the hydrolytic compositions of aluminum in PACls, but revealed that Al species distribution of PACls was little affected by the base injection rate ranging from 21.5 ㎖/hr to 60 ㎖/hr. Coagulation test of synthetic water showed that the effect of coagulation pH on turbidity removal was severer for low r ratio PACls, alum, and AlCl₃. Also, the effect of pH for coagulation of Nakdong river water showed that each Al(Ⅲ) coagulant had different effects on turbidity and TOC removal. Especially, PACls were least affected among other Al(Ⅲ) coagulants used.

상호작용 다중모델-무향 칼만필터 기반 공대공 기관포 정밀 타격 성능 향상 기법에 관한 연구

한승우(Seung-woo Han),김종섭(Chong-sup Kim),고기옥(Gi-oak Koh),고상호(Sang-ho Ko) 한국항공우주학회 2023 韓國航空宇宙學會誌 Vol.51 No.3

본 논문에서는 공대공 근접 교전 상황에서 기관포의 정밀 타격 성능 향상을 위한 신호처리 기법에 관한 연구를 수행한다. 목표 항공기의 상태 추정 시 단일모델을 사용한 경우와 다중모델을 병렬로 사용한 경우 발생하는 추정 오차를 비교하고 분석한다. 결과적으로 상호작용 다중모델 기법과 무향 칼만필터를 활용하여 기동하는 목표 항공기의 상태를 추정한다. 또한 목표 항공기의 정밀 타격을 위한 가상추적점 생성 기법을 제안한다. 가상추적점을 추종하기 위한 비행제어시스템을 구현하고 기관포를 활용한 목표 항공기 정밀 타격 시뮬레이션을 수행하여 임무 수행 능력과 생존성 향상을 확인한다. This paper describes a signal processing technique to improve the precision aiming performance in close range air-to-air combat. We compare and analyze the state estimation error that occurs when a single model is used or multiple models are used parallel. As a result, the state of the target aircraft is estimated using Interactive Multiple Model method and Unscented Kalman Filter. Also a method to generate virtual pursuit point (VPP) for precision aiming is proposed. Finally, the flight control system is designed to pursuit VPP and close range air-to-air pursuit simulation is performed to evaluate the mission performance and viability.

하수처리수의 인 제거에 미치는 Al(III) 응집제 염기도의 영향

한승우(Seung Woo Han),이철희(Chul Hee Lee),이재관(Jae Hwan Lee),강임석(Lim Seok Kang) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.3

다양한 염기도를 가진 PAC 응집제를 이용한 응집실험에서, 염기도를 낮게 함유하고 있는 PACB (Polymeric Aluminum Chloride Basicity)의 경우 염기도가 높은 PAC 보다 유기물과 인에 응집효율이 높게 나타났다. 저 염기도의 PACB는 고 염기도의 PAC보다 monomeric Al(III) 가수분해 종을 많이 함유하였다. 하수처리수의 응집에 있어서 전하중화와 sweep floc 형성에 따른 응집효율은 저 염기도의 PACB가 고 염기도의 PAC에 비하여 다소 효과적인 것으로 나타났다. 이에 따라 PACB와 PAC를 이용한 응집실험 결과 Al₂O₃ 농도가 유사한 경우 고 염기도의 PAC에 비하여 저 염기도 PACB가 탁도, CODMn 그리고 TP 및 PO₄-P에 대하여 보다 우수한 응집효과를 나타내었다. According to the coagulation tests for PACs with various basicities, the PACB with lower basicity showed higher coagulation efficiencies of organics and phosphorus than the PAC with higher basicity. The PACB contained higher amount of monomeric Al (III) hydrolytic species comparing with PAC. In case of the coagulation for the sewage treated water, the coagulation efficiency by the charge neutralization and sweep floc formation was higher with PACB than with PAC. Accordingly, when Al₂O₃ concentration was similar in the coagulant, PACB showed higher removal efficiencies of turbidity, CODMn, TP, and PO₄-P comparing with PAC, especially in the lower range of coagulant dose.