이중선회 연소기에서 파일럿과 메인화염의 상호작용에 관한 연구

朴泰俊 順天大學校大學院 2014 국내석사

An optimum nozzle configuration and interaction between pilot and main flames in a dual swirl combustor were investigated experimentally and numerically. First in geometric optimization study, location of pilot nozzle, angle and direction of swirler vane were varied as main parameters. As a result, the variation in locations of inner fuel nozzle and pilot burner resulted in significant change in flame shape and swirl intensity due to the changes in recirculating flow pattern and minimum flow area near burner exit, in particular with the significant reduction of CO emission near lean-flammability limit. Second in interaction between pilot and main flames, under the condition of fixed swirl angle of 45° for main flame, the swirl angle of pilot flame, total heat release rate and equivalence ratio of main flame were used as major parameters. It was found that the swirl angle of pilot flame plays the most important role in the changes in flame location and overall flow structure inside the combustor, and thus leads to the significant change in the interaction between pilot and main flame.

공진형 스위치를 이용한 buck 스위칭 전원 설계에 관한 연구

박태준 경희대학교 1990 국내석사

염화칼슘 수용액에서 철강의 부식에 미치는 부식억제제(아질산나트륨, 헥사메탄인산염, 트리에탄올아민, 설탕, 요소)의 영향

박태준 조선대학교 대학원 2018 국내석사

Abstract Effects of inhibitors (sodium nitrite, sodium hexametaphosphate, triethanolamine, sugar, and urea) on the corrosion of steel in a calcium chloride solution Tae Jun Park Advisor: Prof. HeeJin Jang, Ph. D. Dept. of Advanced Materials Engineering Graduate School of Chosun University Various kinds of corrosion inhibitors are added to deicing salt in order to reduce its corrosivity and we need to optimize the concentration of each additive to reach the low corrosivity and high deicing ability simultaneously. RSM (Response Surface Methodology), a type of DOE (Design of Experiment technique), was applied to examine the effects of each additive and find the optimum composition of the deicing agent. NaNO2, (NaPO3)6, TEA(Triethylamine), sugar, and urea were used asadditives in this study. CaCl2-based test solutions with these additives of different concentrations were designed by RSM. The corrosionrate of steels heet was e valuated in the test solutions by electrochemical potentiodynamic polarization tests. A statistical model was obtained for the corrosionrate, suggesting the main effect of each additive and interactions between additives quantitatively

한국음식과 한국문화의 감성적인 체험공간디자인 : 한류 스타의 오감적 체험 공간

박태준 홍익대학교 건축도시 대학원 2006 국내석사

1990년대 중반 중국과 대만에서 일기 시작한 한류 열풍은 홍콩, 싱가포르, 태국, 베트남 그리고 일본에까지 확산되었을 뿐만 아니라, 말레이시아와 아랍에미리트연합과 쿠웨이트, 사우디아라비아 등지에서도 한류의 바람이 불기 시작했다. 1996년 한국의 텔레비전 드라마가 중국에 수출되면서 영상에 노출되어진 한국드라마 촬영지를 직접 답사하는 등 이러한 “한류열풍”은 유관 관광 상품과 더불어 관광 상품으로 자리 매김하고 있으며 관광마케팅의 한 분야로서 크게 부각되고 있다. 이러한 한류열풍의 영향으로 우리나라 제1의 관광시장인 일본인 관광객 245만 명이 방한하였고, 중국인 63만 명이 방한하는 성과를 거두었다 (한국관광공사,2004,12). 과거 소극적인 관광에서 직접체험하고 감동을 느끼기 위해 드라마촬영지를 방문하여 드라마 속의 장면들을 체험하며 드라마 속에서의 감동을 직접 느끼고자 하는 적극적인 관광으로 바뀌고 있다. 한류의 이미지를 형성시키는 대표적인 요소로는 중국에서는 한국청소년들이 좋아하는 가요, 뮤직비디오, 드라마, 영화 등으로 꼽을 수 있을 것이며, 일본에서는 TV 드라마, 영화 등으로 꼽을 수 있다. 특히 한류를 향유하고 있는 주요 고객은 중국에서는 주로 10대, 20대 젊은 층이 주도하는 반면 일본에서는 주로 기혼 여성인 40~50대 주부들이다. 한류열풍이 중국과 동남아시아를 넘어 일본에까지 불고 있다는 것에 대해 주목할 만하다. 한국의 배우와 드라마가 일본에서 히트를 치며 일본인에게 한국에 대한 이미지를 바꾸고 한국에 대한 긍정적인 생각을 가지게 만들었다. 이러한 이미지의 변화는 한국에 경제적 효과를 기대 할 수 있다. 앞에서 말한 것과 같이 중국에서 시작한 한류 열풍은 현재 엄청난 붐을 일고 있다. 이를 바탕으로 관광에서 즐길 수 있는 한류를 현지에서도 똑같이 누릴 수 있는 방법을 모색하고 한국 경제에 도움이 될 수 있는 방법은 무엇인지 구상하였고 이에 본 연구의 의의는 크다 하겠다. 본 연구의 과정(課程)과 내용(內容)은 다음과 같다. 제1장에서는 서론으로, 이 연구의 배경·목적·연구의 방법 및 범위를 설정한다. 제2장에서는 이론적 배경으로서 한류를 살펴보았다. 즉 이론적 고찰을 통해 한류의 개념 및 한류의 생성원인, 효과를 알아보고 나라별 한류열풍의 현황과 한류의 전망은 물론 개념 및 특징, 중요성, 구성요소와 형성과정을 검토함으로써 이론적 근거자료를 제시하였다. 제3장은 현대 실내디자인의 전통적 표현을 사례조사를 통해 분석한다. 이에 먼저 현대 실내디자인의 전통적 표현경향을 공간별로 알아보고, 전통성 표현으로 이용되는 구성요소의 특성을 파악한다. 또한 이를 통해 한국 전통적 표현의 분석 방법의 유형을 정리하여, 이를 통한 대표적 공간을 분석한다. 제4장에서는 전통적 한국성 표현방법을 적용한 한국음식과 한국문화의 감성적인 체험 공간 레스토랑을 설계하고자 한다. 제5장은 결론으로서, 이상의 연구·조사 결과를 토대로 한 한류스타의 오감적 체험공간을 정리하여 이 연구의 의의와 가능성을 제시한다. The fever of the Korean Wave has begun to emerge in China and Taiwan in the mid of the 1990s, jumping on the bandwagon of Malaysia, UA, Kuwait, Saudi Arabia as well as Hongkong, Singapore, Vietnam, and Japan. Such Korean Wave, which has inspired many Asians to explore locations of Korean soap operas in TVs, has been securing the solid positions of goods for tourism along with a field of tourist marketing. This has appeared since Korean dramas were exported in China in 1996. Such effect of the Korean Wave has helped 245 tourists from Japan, the primary tourist market of Korea, making a visit to South Korea, bringing 630,000 Chinese visitors to Korea. (the statistics by the Korea Tourism Corporation in December 12) They used to conduct a static tour, in the past, but today, they have been conducting a dynamic tour, by visiting locations of soap operas, and experiencing real scenes of such operas, under deep impressions. In China, the typical factors of forming images of the Korean Wave, are counted as popular songs, music videos, TV dramas, and films that Korean youths prefer, while in Japan, the typical factors of doing them are TV dramas and films are counted. In China, young teenagers and those in their 20s are mainly immersed in the Korean Wave, while, in Japan, married women in their 40s and 50s, are mainly enthralled by the Wave. It is worth while to be noted that the Korean Wave has been spreading to Japan, as well as Southeast Asians. With actors and dramas from Korea making a big hit, most Japanese have begun to change their mindset toward images of Korea, having a positive way of thinking toward Korea. Such change in images are expected to have an economic effect on Korea. As above-stated, the fever of Korean Wave from China has still been facilitating a lot of booms. Based on it, the research theme is designed to find ways so that the Korean Wave could be maintained in local countries. And, the theme is intended to study of how the Korean Wave would be conducive to the national economy, In the respect, the theme assumes much significance. The processes of contents of the research theme are as follows: The first chapter of the prologue is to present the background, purpose, method, and scope of the research. The second chapter is to examine the Korean Wave against the theoretical backdrop. In other words, the chapter is to describe the concept, root, and effects of the Korean Wave, with the ongoing situations of the fever of the Wave in each country, and the prospect of the Wave. And furthermore, the chapter is to make a review on concept, characteristics, significance, components, and forms, along with relevant theoretical data. The third chapter is to conduct an analysis on traditional elements of designs indoors, through a case study. In the regard, the chapter is study such elements and understand characteristics of components expressed by traditional factors. It is also to summarize entire comparative analysis. The fourth chapter is to design a sentimental restaurant of Korean food and Korean culture applying Korean traditional way of expressing. The fifth chapter of the conclusion is to put forward the significance and potentialities of the research, under the five senses of popular stars from the Korean Wave based on the study and result of the research.

렘수면 의존성 폐쇄성 수면 무호흡증 여자 환자군에 대한 비교 연구

박태준 서울대학교 대학원 2008 국내석사

PEDOT/PSS 복합재료의 전기화학 성질연구

박태준 성균관대학교 2005 국내석사

Polythiophene and their derivatives have been investigated intensively because of their interesting electrical properties and relatively good environmental stability. Among conducting polymers, poly(3,4-ethyldioxythiophene) (PEDOT) has attracted much attention because of the high electrical conductivity, transparency, structural stability, low cost, suitable morphology and fast doping/undoping mechanism. PEDOT films have very high conductivity (>200 S/cm) and switchable optical transparency during electrochemical redox reaction. By introducing the water soluble polyelectrolyte poly(styrenesulfonate) (PSS) as a counter ion dopant during polymerization, a PEDOT/PSS complex has been generated, showing high water solubility. This dual-polymer complex formed a highly stable dispersion in water, with substantial conductivity (>10 S/cm), high transparency and robust film formation properties. Therefore we were primarily focused on the electrochemical, electrochromic characterization and effect on carrier transport properties of glue/conducting polymer composite films. In this study, poly(3,4-ethylenedioxythiophene) (PEDOT)/poly(styrene sulfonate) (PSS) was used for the base conducting polymers. We cast the thin film of PEDOT/PSS composite by using the solution which mixed PEDOT/PSS and poly(vinylalcohol) (PVA)/water. The composite films were clearly observed in the potentiostat, UV/Vis spectroscopy, mass measurement. In conclusion, we found the ideal electrochemical electrolyte that made from noble hybrid-solutions. And PEDOT/PSS composites display switchable optical absorbance when converted from the reduced to the oxidized state. Also, the PEDOT/PSS/PVA composite was mixed with more PVA content, the composite was less electrical conductivity. On the other hand, the PEDOT/PSS/PVA composite was ascertained that transparency and electrochemical durability as a function of time in co-electrolyte was excellent. Finally, we know that PEDOT film has anion transport property, while PEDOT/PSS and PEDOT/PSS/PVA film have cation transport property when it oxidized/reduced state.

간 이식 예정 환자의 구강건강상태 및 치과치료 요구도에 관한 연구

박태준 서울대학교 치의학대학원 2009 국내석사

生命保險會社의 財務健全性 決定要因에 관한 實證硏究 : 巨視經濟 및 金融市場 變數를 中心으로

박태준 成均館大學校 2006 국내박사

Following the IMF crisis, many distressed financial companies were expelled from the market as a result of large-scale restructuring measures in the financial market, which was also accompanied by injection of enormous amount of public funds. Since then, the general public has been increasingly interested in assessment of financial soundness, as well as its sustainability, of financial institutions. For life insurance industry, although more than 40% of existing companies were classified as insolvent financial institutions and expelled from the market, a new crisis has emerged within the industry with increasing number of insurers again experiencing financial distress due to intense market competition, continued economic recession and interest rate negative spread. Thus, risk management has become more important than ever, in assessing how the financial soundness of life insurance company changes with fluctuation in macroeconomic indices and financial market condition, and recognizing the early signs of potential financial distress. Generally, financial distress of life insurance companies is caused by various factors, including external economic factors and risk factors specific to individual life insurance companies. However, it is also affected by macroeconomic changes, both directly and indirectly. Despite this fact, assessment of life insurance companies' financial soundness, especially studies on signs of financial distress, is conducted from a micro perspective, based on financial variables like CAMEL of individual life insurance companies. However, as various financial risks increased with rapid change in financial environment, there is a limitation in assessing financial soundness and predicting insolvency at early stage based on individual companies' financial statistics. Thus, it is necessary to find out the relationship between macroeconomic variables and financial soundness, to extract such macroeconomic variables and to predict potential insolvency. In consideration of such circumstances, this study is, unlike other existing studies, focused on macroeconomic and financial market indices and analyzes the effect of these variables and the time-lag structure. With these objectives, 11 macroeconomic and financial market variables are selected and those affecting the Default Ratio and Net Asset Ratio of life insurance companies are extracted using cross-correlation analysis. Then, for seven significant variables in time-lag relationship, it generates a regression equation and performs empirical analysis on variables' effect and time-lag structure using time series multiple regression. Along with this, for Net Asset Ratio, which is highly correlated with life insurance company's Default Ratio, it distinguishes between expelled companies and surviving companies, and performs a comparison of how different a correlation of each variables and time-lag structures are. The findings from this empirical study are as below : First, the variables affecting Default Ratio of life insurance include the dishonored bill ratio, consumer price inflation rate, and the interest rate differential between corporate bonds and CD. For the dishonored bill ratio and consumer price inflation rate, variables of (t-1) period and (t-4) period have positive (+) effect on the Default Ratio of life insurance company respectively, while the interest rate differential between bonds and CD generates time-lag relationship in (t-6) period and have a negative (-) effect. Second, variables affecting the surviving companies' Net Asset Ratio include the saving ratio, the inflation rate and the average yield on corporate bonds, but the real GDP growth rate and the dishonored bill ratio are not significant. The saving ratio of (t) period has positive (+) correlation with Net Asset Ratio. For the inflation rate and the corporate bond interest rate, variables of (t) period and (t-2) period have a negative (-) effect on Net Asset Ratio. Third, variables affecting the expelled companies' Net Asset Ratio include the saving ratio, the dishonored bill ratio and the interest rate differential between corporate bonds and CD. The saving ratio in period prior to (t-5) and the interest rate differential between corporate bonds and CD in period prior to (t-6) have a positive (+) effect. The dishonored bill ratio in period prior to (t-5) has a negative (-) effect. Compared with the surviving companies, it also includes the interest rate differential between long and short term and the dishonored bill ratio which represents the level of credit crunch in financial market. Fourth, while the surviving companies are affected by macroeconomic variables of the current period or period prior to (t-2) in time-lag and changed almost simultaneously with changes in macroeconomic environment, the expelled companies show changes in Net Asset Ratio after considerable lapse of time. Fifth, among several rates affecting a life insurance company's management, while the surviving companies are affected by the average yield on corporate bonds(long term interest rate), the expelled companies are affected by the interest rate differential between short and long term, influenced by the trend of changes of short term interest rate and correlated with the Default Ratio of life insurance companies. Thus, the variables above need to be considered in studies, which are related with later assessment of financial soundness and prediction of insolvency. Sixth, significant macroeconomic variable for the expelled companies is the dishonored bill ratio. This is related with the short term asset management for liquidity when the expelled companies' money crunch is worsened. For life insurance company's insolvency, it needs to monitor the above indices. Seventh, macroeconomic variables affecting the Default Ratio and Net Asset Ratio are mostly related with real sector variables in macroeconomic. Except for the interest rate in financial market, most variables are not significant. This is due to the accounting system, whereby life insurance company's assets and liabilities are stated at cost. Lastly, in cross-correlation analysis, many macroeconomic variables affecting Default Ratio and Net Asset Ratio turned out similar to one another. Thus when macroeconomic environment deteriorates, the indices above are expected to show life insurance companies' possible insolvency at early stage. Although many life insurance companies have been expelled since the IMF crisis, there has been no effort to identify correlation between the variables of macroeconomic environment and financial market as well as the life insurance company' financial soundness. This study is the first trial beyond other existing research methods which assess possible insolvency mainly with multivariate analysis for financial variables of life insurance company. However, there are some limitations in this study as described below : First, while the Default Ratio and Net Asset Ratio are statistics covering all companies in life insurance industry and are helpful to reveal the industry trend of life insurance companies, there are some limitations in understanding the distinctive features of each insurance company and in performing detailed analysis. Second, to analyze effective level of life insurance company's Net Asset Ratio and time-lag relationship, precise results can be generated with asset and liability value in market price. However, it might appear that the correlation and effectiveness among variables of insurance accounting system in the current cost-price assessment method are not sensitive. Lastly, factors causing insurance companies' financial distress include the wrong decision-making and moral hazard of the management or majority shareholders as well as macroeconomic variables. However, these qualitative factors are hard to measure and not contained in the scope of this study. Thus these are not considered as factors here. Recently, there is a move from current monitoring system focused on individual financial company's soundness to new financial soundness monitoring policy among IMF, ADB and BIS. The time is right for the Korean Financial Supervisory Service to drive plans to change its supervisory direction to reflect macroeconomic changes and financial market environment, considering that each financial company's soundness is affected by the individual company's management that should be changed along with the financial environment. Especially in recent unstable financial market, it is quiet important to monitor macroeconomic changes, analyze potential risk factors and reflect on supervisory task. In conclusion, this study is the first empirical analysis to fill up the existing insufficient studies and also provides theoretical basement for risk management of insurance companies in Korea, including early warning system or stress test analysis using macroeconomic indicators. For supervisory authorities these findings are expected to be included in an early warning system to diagnose an insurance company's potential insolvency in consideration of macroeconomic and financial market changes, and develop the insurance company's financial soundness. Particularly for financial crisis such as IMF crisis, it could be possible to assess the loss severity of insurance company's asset and strengthen supervision for company with excessive risk by using stress test analysis. Through this analysis, supervisory authorities can strengthen precautionary inspection on insurance companies with sign of possible financial distress or insolvency and improve the policy's effectiveness and timeliness. For individual insurance company, it should be reconsidered on external environment variables affecting business. Also when they set up the management strategy for the future, they can establish effective and precautionary risk management methods for the sector, which have weaknesses in unstable economic environment. For predicting possibility of financial distress or insolvency in life insurance company, it can be possible to build dynamic financial models for their own companies by combining financial features and characteristics of individual company with the empirical results of this study. Therefore this study would be helpful to set up company's management strategy and financial plan to minimize fluctuation of company value along with macroeconomic changes.

Nonlinear kinematic hardening law based on non-associated flow rule and two-yield surface plasticity

박태준 서울대학교 대학원 2013 국내박사

비상관 소성 흐름 법칙과 두-항복면 소성에 기반한 비선형 이동 경화 구성방정식을 개발하였으며, 이를 측정된 물성치에 대입하는 물성화 기법을 개발하였다. 아울러 개발된 구성방정식을 정식화하여 유한요소 해석에 도입하였다. 금속 판재에 역하중이 걸릴 때 나타나는 Bauschinger 효과, 전이 거동 및 영구연화 등을 다양한 예비변형률의 비례 하중 또는 불비례 하중 조건에 대해 구현하기 위해, 본 구성방정식에서는 내부 표면과 외부 표면 모두 등방(확장) 및 이동 경화가 일어나도록 하였다. 영구 연화 거동을 구현하기 위해서, 외부 표면 등방 경화 및 이동 경화 법칙을 수정하여 외부 표면의 크기와 중심이 소성 변형의 이력에 따라 다르게 변하게 하였다. 개발된 구성방정식을 초고강도강인 DP980에 적용하여 검증하였다. 일축 인장, 일축 압축, 일축 인장-재인장, 디스크 압축 시험을 수행하였으며, 일축 인장-압축 및 인장-압축-인장 시험을 다양한 예비 변형률에 대해 수행하여 개발된 두-표면 소성에 기반한 구성방정식의 적합성을 검증하였다. A nonlinear kinematic hardening law and its numerical formulation for the finite element analysis were developed based on non-associated flow rule and two-yield surface plasticity. In order to represent the Bauschinger effect and transient behavior as well as permanent softening (or hardening stagnation) during the stress reversal, both the inner yield surface and the (outer) bounding surface have isotropic (expansion) and kinematic (translation) hardening. Especially for the transient behavior for repetitive stress reversal, such as cyclic hardening at a low strain rage, the bounding surface temporarily expands and recovers to its original shape. As for the permanent softening, the isotropic hardening and the kinematic hardening evolution of the outer bounding surface are altered depending on the previous loading histories. For the verification, the developed constitutive law was applied to the DP980 advanced high strength steel sheet. Besides uni-axial tension, uni-axial compression, uni-axial tension-unloading and disk compression tests, uni-axial tension-compression-tension (T-C-T) tests were extensively performed with various pre-stains for the characterization of the DP980 steel sheet.

Development of cross-linked hyaluronic acid microparticles in high density as a novel anti-adhesion barrier

박태준 中央大學校 大學院 2018 국내석사

Intra-abdominal adhesion is an inadequate wound healing process which approximately transpires after the abdominal surgery. Generally, hyaluronic acid (HA) is being used as an anti-adhesion barrier, however its rapid degradation is a big problem for the anti-adhesion barrier. Cross-linking technique improved its degradation rate but has some limitations. This study tried to develop cross-linked highly dense HA microparticles by using centrifuge. Decrease surface area of HA microparticles and simultaneously strengthens the physical property of microparticles by centrifugal force. HA microparticles were prepared by a water-in-oil emulsion technique and cross-linking agent BDDE was added. After stirring for 2 h, cross-linked HA microparticles were acquired. Meanwhile, this study used centrifuge in the middle of the cross-linking process. Regulating rpm and time of centrifugation, this study found the proper condition and evaluated particles. Observed by SEM, it appeared that there was a difference between normally cross-linked HA microparticles and cross-linked high dense HA microparticles. However, this would not be apparent to the naked eye, and zero shear rate and residence stability were thereby evaluated to verify the effect of centrifugation in the middle of the cross-linking process. Value of zero shear rate and residence stability showed an increasing tendency to stabilize as the centrifugation time increased. The improved physical property and aggregation resulted in a high density of microparticles and this interfered with the flow rate and high residence stability. Cross-linked highly dense HA microparticles were fabricated by adding centrifugation process during the cross-linking. These HA microparticles delayed the degradation rate of hyaluronic acid which is known as a problem of anti-adhesion barriers to overcome. 유착이란 외과 수술 후 자연히 발생하는 현상으로 제거되지 않으면 각종 후유증을 유발한다. 유착방지제의 주성분으로 히알루론산이 많이 사용되고 있는데 히알루론산은 체내에서 빠르게 분해되어 유착방지효과가 떨어진다는 단점이 있다. 본 연구의 목적은 히알루론산의 빠른 분해를 막기 위해, 히알루론산을 미립자로 만들어 표면적을 증가시킴과 동시에 가교 과정에 원심분리기를 이용하여 원심력에 의해 미립자끼리 뭉치게 함으로써 고밀도의 입자를 제조하는 것에 있다. 히알루론산 미립자는 유중 수적형 에멀전을 통해 제조하였고, 에멀전에 가교제를 첨가, 2시간동안 교반을 시켜 가교된 히알루론산 미립자를 얻었다. 미립자를 제조함으로써 표면적을 감소시켰지만 본 연구에서는 더 나아가, 가교 과정중에 원심분리기를 추가로 이용하였다. 원심분리기의 분당 회전수와 원심분리기 작동 시간을 조절하며 가교된 고밀도의 히알루론산 미립자를 평가하였다. 전자주사현미경으로 표면 관찰 결과, 원심분리기의 분당 회전수가 높을수록, 그리고 원심분리기 작동시간이 오래 될수록 표면의 구멍의 크기나 개수가 줄어는 양상을 보였다. 하지만 육안으로의 관찰은 부정확하기 때문에 추가적으로 영점전단속도와 용액의 분해 정도를 측정하였다. 측정결과, 분당 회전수 4000으로 30분, 1시간, 1시간 30분으로 갈수록 미립자의 물리적 강도가 증가하였고, 1시간 30분 동안 원심분리 과정을 통해 가교된 히알루론산 미립자들은 다른 시간대의 미립자들 보다 향상된 영점전단속도와 분해정도 측정값을 보였다. 원심분리기를 통해 미립자들 사이에 강한 뭉침현상과 내부 구조 변화는 분산체 흐름을 방해하였고, 표면적이 줄어들어 분해시간이 오래 걸렸음을 예상 할 수 있었다. 히알루론산의 가교 단계 중간에 원심분리 과정을 추가로 한 결과, 가교된 고밀도의 히알루론산 미립자를 얻을 수 있었고, 이 미립자들은 히알루론산의 분해시간을 늦춰 유착방지제의 단점인 체내 지속성 문제를 해결 할 수 있다.