A356과 ADC12 합금 용탕의 수소함량이 수축 결함에 미치는 영향

김창근 조선대학교 대학원 2019 국내석사

A356 and ADC12,Aluminum alloy for casting, are excellent in fluidity, casting crack prevention, reduced solidification shrinkage and wear resistance due to high Si content. But when hydrogen concentration in the molten metal is high, pores are generated and enlarged to produce solidification shrinkage defects. Many previous studies have analyzed the effect of hydrogen on the shrinkage through experiments or simulations to suppress casting defects. Inthisstudy,wetriedtofindouttheeffectofvariousconcentrationsof hydrogen on the shrinkage defects. Whenmeltingaluminum,ifthegeneratedhydrogenexceedsthecritical solubility in the melt, the gas pressure increases during solidification. Then pores are generated when the hydrogen gas pressure is greater than the external pressure. After the pores are formed, if the pores are surrounded amongdendrites,theybecomeshrinkagedefectswhensolidificationis completed. According to Sievert's law, the solubility of hydrogen increase in liquidaluminumasthetemperatureincreases.Usingthisphenomenon, hydrogen concentration was controlled by the melt temperature in this study. Then we analyzed the shrinkage distribution induced by hydrogen. A356 and ADC12,Aluminum alloy for casting, are excellent in fluidity, casting crack prevention, reduced solidification shrinkage and wear resistance due to high Si content. But when hydrogen concentration in the molten metal is high, pores are generated and enlarged to produce solidification shrinkage defects. Many previous studies have analyzed the effect of hydrogen on the shrinkage through experiments or simulations to suppress casting defects. Inthisstudy,wetriedtofindouttheeffectofvariousconcentrationsof hydrogen on the shrinkage defects. Whenmeltingaluminum,ifthegeneratedhydrogenexceedsthecritical solubility in the melt, the gas pressure increases during solidification. Then pores are generated when the hydrogen gas pressure is greater than the external pressure. After the pores are formed, if the pores are surrounded amongdendrites,theybecomeshrinkagedefectswhensolidificationis completed. According to Sievert's law, the solubility of hydrogen increase in liquidaluminumasthetemperatureincreases.Usingthisphenomenon, hydrogen concentration was controlled by the melt temperature in this study. Then we analyzed the shrinkage distribution induced by hydrogen.

F. Liszt 「Rigoletto-Paraphrase」의 편곡 기법에 관한 고찰

김창근 경희대학교 대학원 2000 국내석사

리스트(F.Liszt 1811-1886)는 헝가리의 외딴 시골에서 태어나 75세로 세상을 떠난 낭만주의 음악의 거장으로, 피아노 연주가이며 또한 작곡가, 평론가, 지휘자, 교육자, 그리고 승려로서 다채로운 인생을 보냈다. 리스트는 19세기에 보기 드문 피아노 연주기교의 거장으로서-작곡가로서, 많은 작품을 작곡하였는데 그 작품수가 1200여 곡이나 된다. 19세기에 피아노가 가장 사랑을 받은 악기인 만큼 그도 피아노 음악 작품을 많이 작곡하였으며‘피아노 마법사’라는 이름까지 붙여질 정도로 작품수가 무려 600여곡이나 되고, 그중 창작곡이 300여곡, 다른 사람이 작곡한 가곡, 기악곡, 오페라 등을 피아노로 편곡한 작품이 300여곡이 포함된다. 리스트의 피아노곡에는 이제까지의 작품에서는 찾아볼 수 없었던 갖가지 기법이 들어있어서 연주 양식과 피아노곡의 서법에 크게 공헌한 것은 역사적인 의미에서도 매우 중요하다. 또한 그의 피아노곡은 초인간적인 기교가 담겨 있으며 피아노 악기의 최대한 성능을 발휘시켰고 오케스트라 음악을 단 한대의 피아노로 편곡함으로써 라디오와 레코드가 없었던 당시에 가정에서 피아노 편곡으로도 오케스트라 음악을 즐길수 있게 하였다. 19세기의 대 음악가인 리스트는 초기낭만파와 중기낭만파의 인물임과 동시에 후기낭만파의 선구자적인 작곡가로서 특히 다른 작곡가들의 작품들을 피아노독주를 위해 편곡함으로써 그들의 작품을 많이 선전해 주었다. 리스트의 피아노 음악중 편곡이 대부분을 차지하는데 가곡, 기악곡, 오페라 등 여러 장르에 걸친 작품들이 있다. 본 논문에서 리스트가 1859년에 이탈리아 오페라 대 작곡가인 베르디(G.Vrdi 1813-1901)의 오페라「Rigoletto」의 3막에서 나오는 4중창을 피아노곡으로 편곡한「Rigoletto-paraphrase」를 원 곡과 비교, 분석 하는것은 리스트의 음악세계를 더 잘 이해하려는데 있다. F. Liszt(1811-1886) is a great master of the romantic music who was born in a solitary country of Hungary and died at 75-year old and had a multi-colored life as a piano researcher, as a composer, as a critic, as a constructor, as an educator and as a monk. Liszt, as a great master and composer of the piano researching techniques rarely seen in the 19th century, had composed a lot of works, and those works numbered about 1,200. As the piano was the musical instrument beloved the most in the 19th century, he also composed the piano music works the most to the extent to be named "a piano wizard", the works he had made was about 600 pieces and among them, his original works were about 300 ones and those works he had arranged the songs, instrumental musics and operas the other people composed into a piano music were about 300 ones. The piano musics of Liszt held all kinds of techniques not seen in the works till that time to contribute greatly to a playing style and a writing method of piano music, which is very important also in a historical significance. In addition, his piano music held a superhuman techniques and displayed the maximum capability of the piano instrument, and he arranged the ochestra music with only one piano at that time when there was no radio or no record to let the people enjoy the orchestra music at home just with a piano arrangement. Liszt who is a great musician of the 19th century, as a pioneering composer as well as a character of the early romantic school and of the middle romantic school, had greatly propagated the other composers' works by arranging their works into a piano solo. Among Liszt's piano musics, the ones arranged occupied the most and there are a lot of works extending over various genres including a song, an instrumental music, an opera and so on. In this study, to compare and analyze 'Rigoletto paraphrase' Liszt arranged the vocal quartet in Act 3 of opera 'Rigoletto' into a piano music in 1859 with the origianal music which G. Verdi(1813-1901), the great opera composer of Italy, had composed has an object of understanding Liszt's music world better.

맑스의 가치론와 시간 : 시점간 단일체계 해석의 확장

김창근 서울대학교 대학원 2005 국내박사

Two Essays on the Impact of Digital Transformation on Corporate Performance : The Mediating and Moderating Effects of Customer Values, Dynamic Capabilities and Uncertainty

김창근 강원대학교 대학원 2024 국내박사

This study examines the impact of corporate strategy attributes, digital transformation, and dynamic capabilities on corporate performance through customer value, and provides information that can be used in future studies on the relationship between digital transformation and dynamic capabilities and corporate performance. The aim is to provide an academic opportunity for parameter factors, and in particular, it focuses on the function of digital transformation that affects market performance such as corporate image and brand awareness, unlike traditional financial performance. In the considered corporate strategy attributes, customer orientation and technology orientation were confirmed to have a relationship with emotional value and social value in addition to traditional customer values such as symbolic, functional, and experiential values, and digital transformation was studied based on digital quality components, referring to previous studies that the quality of service that perceived by customer is more important. Digital quality was subdivided into system quality, information quality, and service quality, and indicators for these were calculated, and the impact of each quality on corporate performance through five factors of customer value was studied. The dynamic capabilities of sensing, seizing, and reconfiguration, which have been covered in traditional strategic management research, were put into leading variables that affect market performance through customer value parameters at the same level as corporate strategy attributes and digital transformation. The analysis method was divided into domestic and overseas. In domestic, online surveys were conducted on office workers working in domestic manufacturing, services, and IT-related companies in Korea to secure survey data for the final 114 respondents. In overseas, an online survey was conducted on employees of companies that handle products and services centered on global companies located in China, and the final 504 respondents were collected. This data is analyzed as a PLS structural equation model. As a result of the analysis, in the case of Korea, 1) only customer orientation in corporate strategy attributes affects social value, 2) System quality and information quality, which are components of digital transformation, affect different types of customer value, and service quality affect all factors of customer value. In addition, 3) dynamic capabilities show meaningful results for the remaining four customer values, excluding social values, 4) The rest of the customer value, excluding social value, affect corporate performance, 5) Uncertainty has no effect on corporate performance. In the case of overseas countries, 1) only customer orientation among corporate strategic attributes affects experimental and social values, 2) Among the digital quality factors, system quality has a sifinificant effect on functional and symbolic values, information quality on functional and emotional values, and service quality on functional, empirical, emotional, and social values. 3) Dynamic capabilities affect all five factors of customer value, and 4) customer value and 5) uncertainty have a significant effect on corporate performance. Based on the results of this analysis, in order to enhance digital transformation capabilities and dynamic capabilities as a corporate strategy attribute based on customer orientation, it is necessary to establish a strategy to help each member of the organization grow their ability to utilize digital technology. Also, it will need to formulate and implement strategies to control the uncertainty and increase the customer value of our products and services. □ Key Words Digital Transformation, Dynamic Capability, Customer Value, Corporate Performance, Uncertainty, Corporate Strategy Attributes

저차원 금속 칼코겐 화합물들의 합성과 구조 해석

김창근 아주대학교 대학원 1996 국내석사

레트로바이러스에 의해 Cardiac Ankyrin Repeat Protein 유전자가 전달된 NIH/3T3 세포주의 특성 분석

김창근 단국대학교 대학원 2013 국내석사

下肢長과 跳躍力과의 相關에 關한 比較分析

김창근 忠南大學校 敎育大學院 1984 국내석사

KT 인터넷 장비의 순환전류 해석 및 대책

김창근 충남대학교 산업대학원 2007 국내석사

In this thesis, problems caused by circulating currents are studied in the KT internet equipments and several new mitigating methods are proposed. When lightening strikes sensitive IT (information Technology) systems such as KT internet equipment, the equipment is used to stop operation and even get damaged permanently. This thesis shows a main cause of abnormal equipment shutdown is not a poor ground connection but an unintentional electrical connection between frame ground (FG) and signal ground (SG) within the equipment. Several mechanisms which generate circulating currents are introduced and analyzed. Further, new methods to decrease the circulating currents are proposed and show that magnitude of the circulating currents decreases considerably. To verify the feasibility of the proposed methods, the methods are implemented in the KT internet system and results in a significant reduction of the number of the equipment shutdown. 오늘날 대부분의 정보통신 센터는 여러 종류의 시스템들이 복잡 다양하게 운용되며 시스템 간 또는 건축물 철골 등에 원하지 않는 접촉으로 폐회로가 형성되는 경우가 있다. 또한 전기를 에너지로 사용하는 모든 시스템에서는 설비 부품의 특성과 열화 등의 원인에 의하여 미소의 차동모드 전류가 발생한다. 본 논문에서는 KT 인터넷 장비에 대한 품질저하 및 빈번한 오동작에 대한 분석 결과 폐회로에 의한 차동모드의 누설전류가 공통모드의 순환전류로 변화되면서 증가하는 현상을 해석하여 대책으로 성과된 것을 기술하였으며 다음과 같이 구성되어 있다. 제1장에서는 본 연구의 배경과 내용을 기술하고, 제2장에서는 현장에서 접하는 인터넷 시스템의 통신접지 개요에 대하 여 기술하였으며, 제3장에서는 정보통신 센터의 차동모드 전류가 접지시스템 폐회로 구 성 시 공통모드 전류로 변환 되어 순환전류가 증가되는 것을 기술하고 제4장에서는 KT인터넷 시스템의 구성 및 복잡 다양한 시스템에 대한 순환전류를 방지하는 대책 후 실험 파형을 측정하여 효과를 기술하였다

TEM 및 화상기법에 의한 크레졸-물 용매펄프화의 탈리그닌 거동에 관한 연구

김창근 江原大學校 1991 국내석사

용도지역제 중첩지정과 거래사고 : 사고사례분석과 개선방안연구

김창근 건국대학교 행정대학원 2025 국내석사

「국토의 계획 및 이용에 관한 법률」에 따라 하나의 토지에 용도지역, 용도지구, 용도구역이 중첩 지정될 수 있도록 제도적으로 허용된 용도지 역제 구조는 여러 문제를 야기하고 있다. 본 연구는 중복 규제가 실제 부 동산 거래에 어떤 영향을 미치는지를 실증적으로 분석하고 제도 개선방안 을 도출하고자 한다. 이러한 중복지정은 제도적으로 허용된 것이지만, 공 시체계 내 전달 방식, 시각화 배열, 해설 정보 부재 등으로 인해 실수요자 의 규제 인지가 제한되는 문제가 발생하고 있다. 특히 개발제한구역과 자연녹지지역, 도시자연공원구역과 제1종 일반주 거지역이 중첩된 사례에서는, 용도지역 지정 당시 토지적성평가를 거치지 않은 채 일괄 지정된 사례도 존재하며, 이는 규제 강도와 공시 내용 간 불안정을 초래하는 배경으로 작용한다. 제도는 중복 규제를 통해 행위 제 한을 강화하는 입법적 취지를 가지지만, 이러한 목적이 실제 공시 구조나 정보 전달 방식에서 충분히 반영되지 못하면서 거래 과정에서 혼란을 유 발할 수 있다. 이러한 문제를 해결하기 위해 본 연구는 공시 체계의 시각적 배열, 규 제 병기 방식, 해설 정보제공의 구조를 실증적으로 분석하고, 중첩지정 구조가 실거래 혼선과 피해로 이어지는 과정을 규명하고자 한다. 이를 통 해 중첩규제의 실효성을 높이고, 정보 전달의 정확성과 신뢰성을 확보할 수 있는 정책적 개선방안을 제시하는 데 목적이 있다. 연구는 대표 사례 분석(금토동, 이태원동)을 통해 공시 정보와 실제 규 제 수준의 괴리를 비교하고, 토지이용규제정보서비스(LURIS), GIS 기반 공 간자료, 항공사진을 종합적으로 활용하였다. 또한, 거래당사자·중개업 자·도시계획 담당자 대상 인터뷰와 전문가 및 일반인을 대상으로 한 50 문항 설문조사를 병행하여 실질 인식의 차이를 도출하였다. 본 연구는 중첩지정 문제를 단순 규제 구조가 아닌 정보 전달 체계의 문제로 인식하고, 병기 방식의 시각화 개선, 해설 정보제공 강화, 일부 지 역의 토지적성평가 기반 재정비, 용도지역의 유연한 재지정 등을 포함한 정책과제를 제시하였다. 이를통해 보다 세밀한 규제 설계와 부동산 거래 의 안정성, 제도 신뢰를 동시에 확보할 수 있는 토대를 마련하는 데 기여 하고자 한다. In accordance with the 「National Land Planning and Utilization Act」, the systematically allowed use ‘use area’, ‘specific use district’, and ‘use districts’ to be overlapped on one land is causing several problems. This study aims to empirically analyze how overlapping regulations affect actual real estate transactions and derive system improvement measures. Although such overlapping designation is systematically permitted, there is a problem that the recognition of regulations by end users is limited due to the delivery method, visualization arrangement, and lack of commentary information within the disclosure system. In particular, in the case of overlapping ‘development restricted areas’ and ‘natural green areas’, ‘urban natural park areas’ and ‘type 1 general residential areas’, there are cases in which they were collectively designated without going through a land adequacy evaluation at the time of designation of the use area. This acts as a background for instability between the strength of regulations and the contents of the disclosure. The system has the legislative purpose of strengthening restrictions on behavior through duplicate regulations, but this purpose is not sufficiently reflected in the actual disclosure structure or information delivery method, which can cause confusion in the transaction process. To solve this problem, this study empirically analyzes the visual arrangement of the disclosure system, the regulatory writing method, and the structure of providing commentary information, and investigates the process of the overlapping designation structure leading to actual transaction confusion and damage. Through this, the purpose of this study is to present policy improvement measures to increase the effectiveness of overlapping regulations and to secure the accuracy and reliability of information delivery. The study compared the gap between the disclosure information and the actual level of regulation through 'representative case analysis', and comprehensively utilized the Land Use Regulation Information Service (LURIS), GIS-based data, and aerial photography. In addition, interviews with transaction parties, brokers, and urban planning managers and surveys (50 questions in total) for experts and the general public were conducted in parallel to derive practical differences in perception. This study recognized the overlapping designation problem as a problem of the information delivery system rather than a simple regulatory structure, and presented policy tasks including improving the visualization of weapon methods, strengthening the provision of commentary information, reorganizing the foundation for land adequacy evaluation in some areas, and flexible re-designation of use areas. Through this, it is intended to contribute to laying the foundation for more detailed regulatory design, stability of real estate transactions, and trust in the system at the same time.