우리나라 投資情報仲介機關의 定着化 方案에 關한 硏究 : 投資諮問業과 信用評價制度를 中心으로

김하석 韓國外國語大學校 1989 국내석사

直交變換을 利用한 우리말 音聲認識의 스펙트럼 分析

김하석 朝鮮大學校 大學院 1986 국내석사

This paper describes the disign of a speech recognition system of isolated words using Zero Crossing and Walsh transform, and analyzes the Walsh power sepctrum of the Korean Speech. Speech recognition procedure in this system is as follows. The voice input through a interval filter that reduces impulse noise, is sampled at 8 [KH_(z)], and converted to 8-bit digital signal in A/D converter. The Transformed values are converted with Walsh Transform Algorithm, and Walsh-Transformed values represent the normalized power spectrum which is used to distinguish the energy density of voice and unvoice. Several person's mnemonic voice in Korea is recognized by the rate of 80%.

중화반응과 저속습식마쇄방법을 이용한 순환잔골재 품질 향상에 관한 연구

김하석 公州大學校 大學院 2011 국내박사

For research into the quality improvement of recycled fine aggregates, which is the ultimate goal of the research, using a neutralization reaction and a low speed wet abrasion method, the study conducted theoretical research through literature at home and abroad, focusing on the characteristics and quality of recycled aggregates, the manufacturing technique and method of recycled aggregates, the characteristics of cement paste, the characteristics of aggregates, and neutralization reaction and the characteristics of plaster. Based on the research results, the study carried out relevant experiments of and empirical research into combination factors and material conditions such as the ratio of rinsing water, the type and amount of substance to abrade, and abrasion time, which affect the abrasion environment, as well as the types of beneficial acid during the neutralization reaction which affects the manufacturing condition for the production of quality recycled aggregates, and conditions for reaction. Also, the study reviewed the characteristics of manufactured quality recycled fine aggregates and the characteristics of mortar and concrete which used the characteristics of the quality recycled fine aggregates. Also, the study analyzed influential factors on the manufacturing of quality recycled fine aggregates by undertaking a statistical analysis, and tried to deduce manufacturing conditions by withdrawing the optimal abrasion conditions that satisfy the target capability. The system of the research may be summarized into seven chapters as follows: introduction, the type and characteristics of construction waste, the recycled aggregates production system, the current manufacturing technology, the quality and characteristics of recycled aggregates, neutralization reaction between acid and base, the literature review of plaster, the achievement of quality recycled fine aggregates by neutralization reaction and abrasion process, the review of the optimal manufacturing condition of recycled fine aggregates by the design of experiment, the review of dynamic characteristics of manufactured recycled fine aggregates, and comprehensive conclusion. The research result concerning the quality improvement of recycled fine aggregates using a neutralization reaction and a low speed wet abrasion method may be summarized as follows. ① When low quality recycled fine aggregates are abraded using acidic water as process water, calcium hydroxide is removed because of a neutralization reaction and, also, the pores within a cement paste, in particular, the pores of aggregates and paste interface increased. Therefore, it was possible to remove efficiently the paste only without damaging original aggregates with small force, and the quality of produced recycled fine aggregates appeared to be appropriate for the standard of fine aggregates for concrete, which is proposed within the standard of recycled aggregates quality. ② As a result of the test of the optimal abrasion condition for producing quality recycled fine aggregates, it was better to use a substance to abrade in order to ensure production efficiency and aggregates quality, and concerning the use of the substance to abrade, it was more advantageous in terms of productivity and economic efficiency to use recycled thick aggregates that are generated on the production site, rather than a steel ball that has been already used. In addition, as a result of deducing the optimal abrasion condition, the more the amount of substance to abrade in use, and the smaller the amount of process water used for rinsing aggregates, and the longer the abrasion time, the higher the abrasion efficiency. Also, in consideration of productivity during the application on the production site, it is deemed efficient to decrease the abrasion time while increasing the amount of substance to abrade. ③ Recycled fine aggregates produced by considering the aforementioned optimal abrasion condition with the use of sulfuric acid as reactant, showed excellent quality which recorded 2.4 of dry density and 2.94 of the absorption ratio. Furthermore, plaster which is a reaction product occurring in the process was discovered not to highly affect the quality of aggregates. ④ As a result of the test of mortar using produced recycled fine aggregates, when plaster as a reaction product was contained, it did not exhibit an obvious retarding effect; however, the test sample containing plaster recorded 25.7MPa, whereas the test sample that did not contain plaster posted 29.4MPa in terms of long-term strength; thus, it showed a clear reduction of strength. Specifically, as a result of measuring the micropore size, the pore size of the test sample containing plaster decreased more than the test sample that did not contain plaster, on the third and seventh days of the test, which may be in an early period. Also, the ratio of a relatively big pore ranged from 350~1.0㎛ and from 1.0~0.5㎛, increased by 6% on the 28th day of the test. Therefore, it was concluded to affect disadvantageously the matrix strength. ⑤ As a result of carrying out a test of concrete using the same aggregates as used in the test of mortar, the test sample containing plaster exhibited 36.6MPa, while the test sample that did not contain plaster exhibited 37.8MPa on the 28th day of the test; thereby, the plaster ingredient existent on the aggregates surface was found not to affect the strength. Therefore, it displayed a different strength characteristic unlike that in the test of mortar; however, it is thought to be necessary to conduct additional research into the stability and durability of concrete. ⑥ As a result of the above tests, when using a neutralization reaction with the utilization of acidic water as process water and the abrasion method, it was possible to improve low quality recycled fine aggregates to be of high quality by effectively removing only the cement mortar contained in recycled aggregates. Also, regarding the plaster which is a reaction product, it was revealed not to affect the aggregates quality. However, as a result of the test of mortar, this was confirmed as being liable for deteriorating the flow and strength, and, also, as a result of the test of concrete, it showed a different strength from that in the test of mortar. However, it is considered to be necessary to undertake additional research into the stability and durability of concrete, and, also, it is determined as being necessary to carry out research into the use of acidic substances, specifically, the carbon fixation technology by using CO2, instead of sulfuric acid as a reactant for neutralization reaction. 폐콘크리트를 재활용하여 생산하는 순환골재는 골재의 품질저하의 원인이 되는 시멘트페이스트 성분을 포함하고 있으며 이 시멘트페이스트 성분은 20~25% 정도의 수산화칼슘(Ca(OH)2)을 가지고 있다. 이중 시멘트 페이스트 성분은 순환골재의 품질 저하에 직접적인 원인이 되며 포함되어 있는 수산화칼슘(Ca(OH)2)은 골재의 알칼리도를 상승시켜 토양 및 수자원에 피해를 주는 비점오염원이 되고 있다. 이에 골재의 품질 확보 및 비점오염원의 제거를 위하여 순환골재 중 시멘트페이스트 성분만을 효율적으로 제거하는 것이 가장 중요한 핵심 사항이라 할 수 있으며 이는 산과 염기를 반응 시키는 중화반응을 이용하여 골재 품질 확보 및 최종제품을 중성화 할 수 있다. 즉 골재의 알칼리계 물질인 수산화칼슘(Ca(OH)2)을 각종 산과 반응 시켜 중성화 할 수 있으며, 사용되는 산은 산업 부산물로 배출되는 황산(H2SO4), 염산(HCl), 질산(NHO3) 등의 폐산을 이용할 수 있을 뿐만 아니라 지구 온난화 및 각종 공해의 원인이 되는 이산화탄소(CO2)를 이용할 수 있다. 2009년 건설폐기물은 연간 약 6000만 톤이 발생하였고, 이 중에서 폐콘크리트가 약 3900만 톤으로 건설폐기물의 2/3정도를 차지하고 있다. 이러한 발생량을 이산화탄소(CO2)고정이 가능한 수산화칼슘(Ca(OH)2)의 양으로 산정하면 약 146만 톤 정도가 된다. 수산화칼슘(Ca(OH)2) 1톤당 이산화탄소(CO2) 0.6톤을 고정할 수 있으므로 폐콘크리트 재활용공정을 이용하여 이산화탄소(CO2)는 연간 약 88만 톤을 고정 할 수 있게 된다. 이를 비용으로 환산하면, 2009년 12월 탄소배출권 매매가격을 기준으로 하였을 경우 거래 가격이 1톤당 12.41유로이므로 1,092만 유로(약 176억 원)에 상당한다. 따라서 본 연구에서는 건설 산업 부산물중 큰 비중을 차지하고 있는 폐콘크리트를 부가가치가 낮은 성토, 복토용 등으로 한정하여 사용하게 하는 시멘트 페이스트 성분을 중화반응과 마쇄방법을 이용하여 원골재의 손상 없이 경화시멘트페이스트만을 충분히 제거하여 부가가치가 높고 천연자원 대체제인 구조용 콘크리트 골재로서 사용할 수 있는 고품질 순환골재의 제조 기술 개발과 성능을 검증하는 것이 본 연구의 최종적인 목표이며, 본 연구에 사용되는 중화반응 반응제로서는 황산에 국한하였다. 중화반응과 저속습식마쇄방법을 이용한 순환잔골재 품질향상에 관한 연구의 결과를 다음과 같이 정리 할 수 있다. ① 저 품질의 순환잔골재를 산성수를 공정수로 이용하여 마쇄시킬 경우 중화반응으로 인하여 수산화칼슘이 제거되어 시멘트 페이스트내 공극증가, 특히 골재와 페이스트 계면의 공극이 증가하여 작은 물리력으로 원골재의 피해 없이 페이스트만을 효율적으로 제거하는 것이 가능 하였으며, 생산된 순환잔골재의 품질은 순환골재 품질 기준안에서 제시되어 있는 콘코리트용 잔골재 기준에 적합한 것으로 나타났다. ② 고품질 순환잔골재를 생산하기 위한 최적 마쇄 조건 실험 결과, 생산 효율 및 골재 품질 확보를 위해 피분쇄물을 사용하는 것이 유리하였으며, 사용되는 피분쇄물은 기존에 사용되는 강구보다 생산 현장에서 발생되는 순환굵은골재를 이용하는 것이 생산성과 경제성 등에서 보다 유리 하였다. 또한 최저 마쇄 조건 도출 결과 사용되는 피분쇄물의 양은 많을수록 골재 세척에 사용되는 공정수의 양은 적을수록, 마쇄시간이 길어질수록 마쇄효율이 높은 것으로 나타났으며, 현장 적용 시 생산성을 고려 할 경우 마쇄 시간은 줄이고 피분쇄물의 양을 증가 시키는 것이 효율적이라 사료된다. ③ 황산을 반응 물질로 하고 상기의 최적 마쇄조건을 고려하여 생산한 순환잔골재는 절건 밀도 2.4, 흡수율 2.94의 우수한 품질을 보이고 있다. 또한 공정 중에 발생하는 반응 생성물인 석고는 골재의 품질에는 크게 영향이 없는 것으로 나타났다. ④ 생산된 순환잔골재를 이용하여 모르타르 실험결과 반응 생성물인 석고가 포함된 경우 뚜렷한 응결 지연 효과를 나타내지는 않았지만, 장기 강도에 있어 석고를 포함한 실험체는 25.7MPa 포함하지 않은 실험체는 29.4MPa로 뚜렷한 강도저하를 나타냈다. 특히 세공경 측정 결과 석고가 포함된 시험체의 경우 포함되지 않은 시험체에 비해 3, 7일 초기 재령에 있어 공극의 크기가 감소하였으며 28일 재령에 있어 350~1.0㎛, 1.0~0.5㎛의 비교적 큰 공극의 비율이 6%정도 높아 매트릭스강도에 불리하게 작용한 것으로 판단되었다. ⑤ 모르타르 실험과 동일한 골재를 이용하여 콘크리트 실험을 실시한 결과 28일 재령에서 석고를 포함한 실험체는 36.6MPa 포함하지 않은 실험체는 37.8MPa로 골재표면에 존재하는 석고성분이 강도에 영향을 미치지 않은 것으로 나타나 모르타르 실험과는 다른 강도 특성을 나타내었지만 콘크리트의 안정성 및 내구성에 대한 추가적인 연구가 필요할 것으로 사료된다. ⑥ 상기의 실험결과 산성수를 공정수로 이용한 중화반응과 마쇄방법을 이용할 경우 순환골재에 포함되어 있는 시멘트 모르타르 성분만을 효과적으로 제거하여 저품질의 순환잔골재를 고품질화 하는 것이 가능 하였으며 반응 생성물질인 석고의 경우 골재의 품질에는 영향을 미치지 않는 것으로 나타났지만 모르타르 실험결과 플로우 및 강도 저하의 원인이 되는 것으로 확인되었으며 콘크리트 실험결과 모르타르 결과와 상이한 강도 결과를 나타내었지만 콘크리트의 안정성 및 내구성에 대한 추가적인 연구가 필요할 것으로 사료되며 중화반응 반응제로서 황산이 아닌 산성계 물질을 이용하는 연구, 특히 이산화탄소를 이용하여 탄소 고정화 기술에 대한 연구가 필요할 것으로 판단된다.

자동차 도장 공장의 color rescheduling storage 설치에 관한 연구

김하석 昌原大學校 2002 국내석사

MPSoC 기반 임베디드 시스템을 위한 마스터/슬레이브 구조의 멀티프로세서 운영체제

김하석 한양대학교 대학원 2007 국내석사

최근 멀티프로세서는 높은 클럭 속도의 단일프로세서와 비교할 때 같은 성능을 내면서도 전력소모는 줄일 수 있고 사이즈는 낮출 수 있는 장점을 있기 때문에 임베디드 시장에서도 그 수요가 증가하고 있다. 이에 따라 멀티프로세서 시스템을 지원하기 위한 멀티프로세서 운영체제에 대한 관심이 날로 높아져가고 있다. 기존의 멀티프로세서 운영체제는 SMP(Symmetric Multi-Processing) 방식의 연구에 집중되고 있으나, SMP 커널은 동일한 (homogeneous) 프로세서만을 지원하고, 지원되는 프로세서의 숫자도 제한되는 단점이 있다. 반면에 최근 주목을 받고 있는 MPSoC(Multi-Processor System-on-Chip)의 경우 동일한 프로세서들뿐만 아니라 이종의 (heterogeneous) 프로세서들로 구성된다. 이러한 경우에는 SMP 커널에 비해 마스터/슬레이브 구조의 커널이 더 나은 확장성과 이식성을 제공한다. 본 연구에서는 마스터/슬레이브 구조에 적합한 커널의 내부 구조와 마스터와 슬레이브간의 효과적인 통신 방법을 제안하였으며, 이를 기반으로 MPSoC에 적합한 멀티프로세서 운영체제인 MPOS(Multi-Processor Operating System)를 개발했고 실험을 통해 그 유용성을 입증하였다. Because Multi-Processor gives high performance as much as high clock speed of single processor, but low power consumption and size shortened, the demand of Multi-Processor in an embedded market has been increased. So, the interest of Multi-Processor operating system for supporting Multi-Processor system has been increased as well. Existing Multi-Processor operating system is more focusing on SMP(Symmetric Multi-Processing) but, it appears defects that support only homogeneous processor and constrain the number of processors. On the other hand, MPSoC(Multi-Processor System-on-Chip) which is recently received significant attention can support not only homogeneous processors but also heterogeneous processors. With this environment, Master/Slave kernel gives better portability and extensibility than SMP kernel. In our study, we propose internal structure of kernel in order to be appropriate for Master/Slave structure and effective communication methodology between master and slave. Based on this, we develop MPOS(Multi-Processor Operating System) applied to MPSoC and verify its usability through delicate experiments.

자동차 차체공장의 배치안 구조가 시스템 효율에 미치는 영향 연구

김하석 창원대학교 2016 국내박사

The layout of manufacturing systems has influence on the performances of the system. Although factories produce same product, the layouts of factories may be quite dissimilar. The layout structure of a factory is characterized by the following two factors. The one is different engineering methods and the other is the habit of system design. The function of body shop is to assemble various parts produced in press shop using welding processes. The body shop in an automotive factory is a typical flow line with assembly, but the layout concept of the line varies among factories. In this thesis, two types of layouts in the body shops, one for layered build and the other for modular build, are compared using simulation study. This thesis deals with two subjects. The first topic is to compare the performance measures of the two layout structures considering various types of failure distributions. The simulation experiments indicate that the modular build layout is better than the layered build layout with respect to production rate. The effects of various failure distributions on the throughputs are also investigated, and some insights are suggested regarding the layout concept. The second topic is to investigate the effects of part transfer policies on the performances of the system, which are applied to the sub-lines in the two types of the layout structures of body shop. Two types of transfer policies, one is synchronous transfer policy and the other is asynchronous transfer policy, are considered. The simulation experiments indicate that the production rate of modular build layout is higher than that of layered build layout regardless of transfer policies. However, the asynchronous transfer policy is better than the synchronous policy and the layered build layout is more sensitive than the modular build layout with respect to the transfer policies.

화학적 처리와 저속 습식 마쇄기를 이용한 고품질 순환잔골재 생산기술 개발

김하석 公州大學校 2007 국내석사

영상처리에 있어서 하프변환에 관한 연구

김하석 朝鮮大學校 大學院 1993 국내박사

One of the important computer applications is image understanding, which is a Little different from image processing. Image understanding is the explicit description of image, while image processing is the study of image to image transforms. Image understanding is the technique which is more necessary to practical engineering application than image processing. The latter however is a prerequisite for the former. The image which is the substitution of an object is usually recognized by the differences in the intensity of brightness. Intensity discontinuities in an image appear to the human eyes as boundaries or edges of objects, which are the fundamentals of recognition. The edge detection is the first step to image understanding. Various methods for edge detection have been reported and are being extensively studied, Edges represented by binary value have the shape of line or curves many of which can be expressed with analytic geometry. A line has two parameters namely the slope and intercept. A circle has three parameters, center coordinate (x_(0),y_(0)) and radius, and an ellipse has five parameters center coordinate, major and minor axis, and rotation angle. A curve is expressed by parameters. Hough transform which is well known as a robust method for line detection (i.e. two parameters determination) has gradually extended it's applicaion to the detection of circle, ellipse and other curves. And yet, the usage of Hough transform as the detector of circle and ellipse has been limited by slow speed and excessive memory since the calculation and memory requirement exponentially increases as the number of parameters to be determined increases. In this study, the methods for ellipse detection are proposed to reduce calculation cost and memory requirement. In this method, 8 points are selected so that those points may be approximately evenly distributed on the ellipse, and used to determine the five parameters by the least square method. 8 points are the tangential coordinates at the direction of 0˚ 45˚ , 90˚ 135˚ . Hough transform is used to find the tangential lines in only 4 directions. Tests for some kinds of ellipses prove that remarkable reduction is achieved in calculation and memory requirement with little error increase. This is because that memory requirement is for 8 points, coefficient matrix of 3 simultaneous equations including image itself and Hough transform is carried out only for 4 directions using only a fraction of original points.

평신도의 영성훈련을 통한 교회성장연구

김하석 亞細亞聯合神學大學校 大學院 2006 국내석사

The Korean church has made great growth and development unprecedented in the history of the protestant Christianity. Turning in 1990s, however, it has stopped its growth and the stagnation is too serious to fail to recognize it. Nevertheless, new churches are being pioneered continuously. However, the trend of contemporary people who avoid planting churches and environmental and financial problems are working as restrictive factors in the growth of churches. Then what should be dealt with importantly in order for churches to overcome such environmental factors and develop? As a pastor of a planting church, the author believes the most important thing is spirituality. In general spirituality means a certain attitude or mentality causing human acts and a specific religious and ethical value. Spirituality in the sense of Christianity emphasizes the relationship between 'me' and God in front of God. A common point of growing churches is that they minister through spiritual training. This is a critical factor for the growth and development of a church not to mention its survival. Spiritual training is wholistic training that helps trainees to imitate the life of Jesus Christ. It is systematic training to help trainees not only to confess Jesus Christ as their Lord but also to practice Jesus' life as if Jesus himself moves and lives. As spiritual training programs, this study dealt with the church growth through life training, spiritual experienced training, the training on small group, faith training, working training and leader training, but not covered practical life in the more active aspect of spirituality. What to be stressed as much as laity's spiritual training is spiritual training for the pastor. In order for the pastor to be able to teach believers, the son of God, using God's Word and all kinds of good methods, he must be spiritually disciplined first. When believers are restored as wholistic persons through spiritual training, the Korean church will keep growing.