碩士學位論文集 : 1982學年度

이길용 朝鮮大學校 産業大學院 1982 국내석사

버스 엔진룸 내 열해현상 방지를 위한 유동장의 실험적 규명

이길용 漢陽大學校 大學院 1998 국내석사

일반적으로 엔진룸 내의 래이아웃(lay out) 변경 시 고려하여야 할 사항은 열해현상(熱害現狀)을 방지하는 것이다. 지금까지 이러한 문제를 해결하기 위하여 승용차에 관해서는 많은 연구가 이루어져왔으나, 버스에 관한 연구는 거의 없는 실정이다. 본 연구는 버스에 대하여 실형의 엔진룸 모형을 제작하였고, 풍동을 사용하여 외부 유동을 만들어 버스가 달리는 효과를 모사하였으며, 네 가지 다른 유입구 모델을 선정하여 유입구 형상에 따른 엔진룸 전체 유동장을 측정하였다. 측정결과 기존 모델은 엔진룸 내부의 정체된 유동형태를 보여 열해현상을 일으킬 수 있는 요소가 있으나, 개선 모델은 라디에이터 성능을 저하시키지 않으면서 엔진룸 내부 유동장을 원활히 순환시켜 열해문제를 해결할 수 있다. 현대자동차 남양연구소에서 실시된 실차시험 결과 엔진룸 내부 공기온도가 15℃ 정도 강하하여 본 실험에서 제안된 모델의 유동구조가 열해현상 방지에 효율적임을 규명하였다.

Optimization of culture condition of Streptococcus sp. KL0188 for efficient hyaluronic acid production on non-animal derived nitrogen source

이길용 경희대학교 2010 국내석사

Hyaluronic acid (HA) is a linear high-molecular-weight polysaccharide with useful biomedical applications. Streptococcus zooepidemicus, a typical HA producing bacterium, requires an animal-derived nitrogen source such as tryptone, peptone, or sheep blood as a nutrient. However, there is potential risk of introducing an adventitious agent and viral infection. Six non-animal-derived (NAD) nitrogen sources were tested for replacing the expensive animal-derived nitrogen source, which may have a potential risk factor. Among those six NAD nitrogen sources, a soybean-derived nitrogen source (Soypeptone F) showed the highest HA productivity equivalent to the control HA production medium containing tryptone in 5 L jar. In 5 L fermentation, it increased cell mass and HA production by 9.5% and 12.7%, respectively. Also, this report described the optimized culture conditions of HA fermentation by Streptococcus sp. KL 0188 on NAD nitrogen source. Various culture conditions, carbon source concentration, nitrogen concentration, temperature, pH, aeration and agitation speed, were tested in batch fermentation. On HA fermentation, optimized fermentation conditions leaded to increasing HA production 5.47 g/L to 6.27 g/L. In a fed-batch culture, the DCW (dry cell weight) and HA production increased to 19.5 g/L and 6.5 g/L, respectively. Streptococcus sp KL0188 균주를 이용한 비 동물성 배지에서 고농도의 Hyaluronic acid (HA)를 생산하기 위하여 총 8가지 비 동물성 배지에서의 균체 생장과 HA 생산성을 확인하였다. 콩 (SP-F, SP A2SC, SP A3SC, HSP-304, HSP-309, SP E110)과 옥수수 (Corn steep solid), 이스트 (Yeast extract)에서 유래한 질소원을 이용하여 flask culture 결과를 토대로 최적 질소원 농도를 확인하였다. Flask culture를 통하여 각각의 질소원에 따른 균체의 생장과 HA 생산성을 비교해 보았을 때 균체의 생장면에서는 HSP-304가 HA 생산성 면에서는 SP-F가 가장 우수한 결과를 나타내었다. 따라서 HSP-304와 SP-F를 5 L jar fermentor에서 HA 생산성 확인을 하였다. 이 때 working volume은 2.5 L로 하였고 배양조건은 control의 조건을 사용하였다. SP-F의 경우 HA 생산성이 control의 경우인 4.5 g/L에서 5.47 g/L로 약 22% 증가하였고 HSP-304는 3 g/L정도의 생산성이 나타난 것을 확인하였다. 따라서 HA를 생산하기 위한 최적 질소원으로 SP-F를 선정하였고 배양 조건 최적화 실험에 이용하였다. 비동물성 질소원을 통한 HA 생산에 있어서 배양 조건을 최적화 하기 위해 6가지 fermentation parameter (탄소원 농도, 질소원 농도, 배양 온도, 배양 pH, 배기량, 교반속도)를 최적화하는 실험을 하였다. 순서대로 하나의 조건을 최적화 한 뒤 그 조건에서 다음 조건을 최적화 하는 방법으로 진행 하였다. 각각의 최적 조건은 75 g/L의 탄소원 농도, 38 g/L의 질소원 농도, 35°C의 배양온도, 7.4의 배양 pH, 2.0 vvm의 배기량, 250~600 rpm의 교반 속도 였다. 각 조건을 최적화 하여 배양을 실시한 결과 균체 생장은 18.38 g/L까지 HA 생산성은 6.27 g/L까지 나타났다. 배양 최적화를 통하여 HA 생산성이 14.7% 증가하였다는 것을 확인 하였으며 여기에 추가적인 HA 생산성 향상을 위하여 fed-batch fermentation을 수행하였다. 총 탄소원 함량은 100 g/L로 하였고 초기 탄소원 함량은 75 g/L로 하였다. 배양 후 배지 내의 탄소원 함량이 10 g/L 이하로 떨어지기 직전에 25 g/L의 추가적인 탄소원을 feeding 하였다. 이 때 최대 균체 생장량은 19.5 g/L였으며, HA 생산성은 6.5 g/L 였고, 소모된 탄소원 대비 HA 생산량은 79.2 mg-HA/g-glucose consumption였다. 위의 결과들을 기존까지 발표된 연구 결과들과 비교를 해 보았을 때 이 연구를 통하여 비 동물성 질소원에서의 HA 생산성을 동물성 질소원 수준까지 끌어 올렸다는 것에 의의를 둘 수 있다. 또한 동물성 질소원을 이용하였을 때 가질 수 있는 잠재적인 위험요소들을 배제 할 수 있게 되었으며 상대적으로 저가격의 비동물성 질소원을 이용하여 생산 단가를 낮출 수 있는 방법을 얻을 수 있었다.

流通團地의 最適配置 및 立地選定에 관한 硏究

李佶勇 경기대학교 행정대학원 1999 국내석사

Taking into consideration the fact that the want of various kinds of social overhead capital facilities and resources foundation facilities is mainly responsible for the weakening of national competitiveness of enterprises, I want this thesis to be designed to get lessons from comparative analysis of foreign examples as to the optimum arrangement of distribution complexes and the selection of location of industry. In order to solve these problems, this research got an analysis of the present condition of the development of domestic distribution complexes, making a comparative analysis of the examples of developed countries on the basis of surveyed and analyzed data gained through looking into existing domestic and foreign research reports and literature. Based on such survey and analysis, this study is expected to suggest a model for predicting the demand of domestic distribution complexes and to suggest the measures of optimum placement and the measures of the selection of location of industry, and to contribute to the retrenchment of resources cost and the strengthening of national competitiveness. The analysis of the examples of foreign examples can be summarized as the following. The Netherlands are carrying out a policy to support the business of distribution complexes as one of the promising growth industry, while they are also executing supporting policies such as public assistance and a tax reduction for enterprises inviting the European market-oriented resources of overseas ventures. Japan is rendering a variety of distribution facilities collective by means of designating distribution complexes as a part of a national land development program and a city development program with the aid of 'Regulations for the Creation of Distributing Urban Districts.' The Japanese government took the lead in creating complexes, and let civilian enterprises construct facilities by transferring State ownership to private ownership after their completion. In case of Europe and U.S.A, since securing land is basically easy, civilians are developing distributing complexes at excellent location in the economic points of view instead of the government's inference. The government is getting involved in the development of distribution complexes in direct and indirect ways through the restrictions of land exploitation, the construction of roads and the rendering of public service. I have come to the following conclusions after the above-mentioned examples of developed countries. To begin with, we can draw a lesson on the subjectivity of creation. I believe it desirable to take the form of civilian-government joint cooperation. To effect this, the opinions of civilians, the very user of distribution complexes, are supposed to reflect from the outset of a plan. Next, another lesson can be drawn from the selection of location of industry. While the selection of location should be pushed forward with the integrate plan for distribution complexes, district-based distribution facilities should be placed in such traffic strategic points as big cities, new industrial zones, high ways, railroads, harbors and the air and so forth. Small and medium sized distributing facilities such as collection and delivery districts in charge of small quantity·much frequency cargo transport, and ordinary cargo terminals should be created in the vicinities of big cities, small and medium cities and small and medium industrial complexes according to their functions. It is absolutely necessary that evaluating standards should, in the first place, be worked out for the selection of the optimum location for the optimum candidate district should be selected among a number of candidate districts. Last, the third lesson can be drawn from the placement of distributing complexes. The arrangement of distributing complexes can be basically divided into a type of inland hubs, a type of district links, and a type of inland-coast links, which can be subdivided into big city, small and medium sized cities and industrial complexes and which can, according to the characteristics of location, be subdivided into a type of inland big city support, a type of a harbor, a type of small and medium sized city support and a type of air support. To be more specific, a type of inland hubs, a type of district links, a type of inland-coast links were suggested in terms of the hub arrangement of the nation as a whole. The type of inland-coast links is believed to be the optimum option for it arranges small and medium sized complexes in addition to the placement of hubs in harbors and the vicinity of big cities, which are identical with a compound cargo terminal in the light of the hierarchy. Next, this research looked into three complexes belonging to big cities, small and medium sized cities, and industrial complexes as a means to become collective and to develope separately in accordance with the size and form of a city. Even if it is a principle to make facilities collective for the purpose of enhancing effectiveness via the functional links between facilities within complexes, separate arrangement is by no means out of the question if side effects in traffic caused by the concentration of facilities according to the situation of the community seem threatening. Lastly, the arrangement of facilities within distributing complexes in accordance with the characteristics of location of industry were suggested according to a type of inland big city support, a type of a harbor and a type of small and medium sized city support and a type of industrial complex support. I believe that while the arrangement model of distributing complexes can be determined by the surrounding conditions, it should create an organic unity among main facilities. I made three suggestions as to a means to raise money for the development of distributing complexes. First, private capital should be encouraged to take part by means of civilian-office joint development. Second, local bonds should be issued by a local autonomous entity for securing financial resources. Third, money can be drawn from inviting foreign investment by offering a certain amount of benefit to multinational corporations.

나노 광촉매를 이용한 이산화탄소 환원 반응에 관한 연구

이길용 전북대학교 대학원 2012 국내박사

Global warming, the most threatening problem to be solved by the scientists to meet the Kyoto Protocol of the United Nations Framework Convention on Climate Change, stimulated the researchers towards alternative fuel sources using artificial photosynthesis. From this standpoint, the development method to convert carbon dioxide into more useful organic compounds inexpensively is highly desirable. TiO2, owing to its outstanding physico-chemical properties primarily because of its high stability towards photocorrosion and its relatively favourable band gap energy has been shown to be the most suitable semiconductor offering the highest light conversion efficiency. The introduction of transition metals on TiO2 has gained considerable attention over the years. Several studies have reported that incorporation of transition metal ions can effectively enhance the efficiency of TiO2-based catalytic systems. Furthermore, the noble metal dopants can change the distribution of electrons because of its own catalytic properties and effectively prevent the electron–hole recombinations, thereby enhance the photocatalytic efficiency of TiO2. However, there is considerable controversy on the effect of metal ions. Also, the loading level plays an important role as higher loading induces faster electron-hole recombination. Hence, it is utmost important to study the level of metal loading to exploit the maximum ability of noble metal-doped TiO2 towards photoreduction. One of the major drawbacks for the practical utilization of photocatalysis is the expensive liquid-solid separation, due to the formation of milky dispersions after mixing the catalyst in water. In order to minimize the above inconvenience, attempts have been made to immobilize the catalyst on rigid supports. The nature of the support is an important factor in the determination of performances of the active phase, notably for metals where metal-support interactions are involved. Silica has been selected as a unique support, since it has been used widely in industry and does not possess a charged framework, but a moderate hydrophobicity. The use of silica as a support for TiO2 has several advantages, since it possesses enhanced thermal/mechanical stability, high surface area and is economically attractive. From the catalytic scope, the deposition of TiO2 on SiO2 enables a better irradiation of the supported TiO2, as SiO2 is transparent to UV radiation. In addition, anatase phase is stabilized by interaction with SiO2 support and the performance of these catalysts is strongly depending upon the dispersion of TiO2 on SiO2. SiO2 supported TiO2 has been reported to exhibit different photocatalytic performance from that TiO2 itself does. As mentioned above, noble metal-doped TiO2 and TiO2/SiO2 show different properties according to their structural changes and metal-support interactions. Accordingly, it is certainly interesting to study the synergistic effect of both dopant and support effect on TiO2. However, no systematic studies have addressed the influence of metaldoped TiO2 on SiO2 support for photocatalytic reduction of carbon dioxide. In the present investigation, I carried out series of investigations on the effect of Ru dopant level, TiO2 loading on SiO2 and the support effect of SiO2 on Ru doped TiO2, paying particular attention to the role played by SiO2 support on Ru doped TiO2 as well as the metal-support interaction in the Ru-TiO2/SiO2 catalyst, which in turn is directly related to its performance in the target reaction. The study is also intended to give a picture of the influence of hole scavengers and catalyst loading on photocatalytic reduction of carbon dioxide, taking TiO2 as photocatalyst. Ru doped anatase supported on silica was prepared by solid-state dispersion method and examined for the photocatalytic reduction of carbon dioxide in aqueous medium at ambient conditions. To assist in interpreting the photocatalytic behaviour of Ru-TiO2/SiO2, reference systems consisting of Ru doped TiO2 and TiO2 supported on SiO2 were also analyzed and the conditions were optimized. Ru/TiO2 photocatalysts with metal loadings of 0.1, 0.3, 0.5 and 1.0 wt% were prepared by impregnation method and a series of TiO2/SiO2 catalysts with low TiO2 (1, 3, 5 and 10 wt%) contents were prepared by solid-state dispersion method. The photocatalysts were characterized using X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscopy (TEM), UV–vis DRS, FT-IR and Raman spectroscopy. The results showed that TiO2 particles with Ru ions have higher photocatalytic activity than undoped TiO2 and the optimum Ru loading was found to be 0.5 wt%. Nevertheless, the yield increased notably when TiO2 was supported on SiO2. This strong enhancement suggests that in 10 wt% TiO2/SiO2 the efficiency of charge separation is strongly influenced through the presence of TiOSi bridging bonds. On the contrary, Ru-TiO2/SiO2 has no significant improvement in activity over TiO2/SiO2 except that it shows nearly quadruple times higher activity for the formation of methanol than Ru/TiO2. The difference in the photocatalytic activity is related to its physico-chemical properties.

멀티미디어 언어 학습 프로그램이 청각장애 학생의 읽기와 쓰기 능력에 미치는 효과

이길용 우석대학교 2002 국내석사

변압기 절연유 중 PCBs의 광분해에 관한 연구

이길용 전북대학교 대학원 2007 국내석사

The objective of this study was to investigate the effect of UV, photosensitizer, O₃, TiO₂, pH and activated carbon on photodegradation of PCBs included in transformer oil. The result of GC chromatograms illustrated the shifting pattern of higher chlorinated biphenyls in transformer oil degraded to lower chlorinated biphenyls by UV irradiation with the extension of reaction time. There were significant effects of Acetone as phtosensitizer, TiO₂, pH significant on photodegradation of PCBs in transformer oil. Degradation rate of PCBs increased with concentration of the Acetone and TiO₂. But as concentration of Acetone was more than 5% with 500ppm TiO₂, PCBs degradation rate decreased. In conditions of higher pH under N₂and lower air, increasing degradability was shown in the same experiments. Additionally, activated carbon could work efficiently for decomposition of PCBs in transformer oil with especially high degradation rate of coplanar PCBs difficult to oxide and remove.

습식교반경화토포장의 온도특성에 관한 연구

이길용 경일대학교 대학원 2004 국내석사

1970년대 이후로 국내 건설 산업은 건설위주의 정책으로 지속적인 성장을 이루어 왔지만 이로 인한 환경문제가 심각하게 대두되고 있다. 시멘트콘크리트와 아스팔트콘크리트포장으로 이루어진 도시지역은 열을 흡수하여 국지적인 열섬효과를 만들어 도시지역의 기온을 상승시키는 주요원인이 되고 있다. 이러한 문제점의 대안으로 최근에 기존 포장에 비해 흡수열량과 방출열량이 적은 흙을 주재료로 하여 특수한 경화재와의 혼합물을 사용한 도로 포장공법이 개발되어 사용되고 있다. 본 연구에서는 시멘트콘크리트와 아스팔트콘크리트, 습식교반경화토를 이용하여 시험포장을 실시하였으며, 현장계측을 통하여 포장형식에 따라 포장체의 온도를 측정하여 온도특성을 규명하였다. 연구 결과, 시험포장에서 계측한 결과를 분석함으로써 대기온도에 따른 포장표면온도와 포장체 내부에서의 온도를 추정할 수 있는 관계식을 제시하였다. 대기온도 변화에 따른 포장체 내부온도 변화는 아스팔트콘크리트포장에서 가장 큰 변화를 나타내는 반면, 습식교반경화토포장에서는 큰 변화를 보이고 있지 않다. 따라서 기존 포장에 비해 흡수열량과 방출열량이 적은 습식교반경화토를 이용하여 공원 산책로, 농로, 관광지 도로, 자전거전용 도로 등과 같은 도로에 적용하게 되면 도시지역의 기온상승을 방지함과 동시에 인체에 무해하고 환경친화적인 도로를 제공할 수 있을 것다. The development drive policy of government ever since 1970s have brought the amazing economical growth of Korea, but has been causing environmental problems. Most roads were paved either asphalt concrete or portland cement concrete. These types of pavements has caused to rise temperature by making local heat islands in urban during summer time. Recently as the alternative to improve environmental problems, the wet-mixing solidified soil pavement, a kind of soil-cement, has developed and has been applied to the recycling and environment-oriented pavement as the surfacing material. The solidified soil wet-mixed is placed on the subgrade along with hot-mix asphalt pavement and PCC pavement. Thermistors are laid in these field test pavements. The temperature gradients of these pavements are automatically measured with time. As the results of this study, the equations estimating surface temperature in three types of pavement is proposed by analyzing measured temperature data. It is shown that the temperature change within the surface layer due to the change of air temperature is the greatest in the asphalt mixture and the least in the solidified soil mixture. Since it is proven that this wet-mixing solidified soil pavement emit less radiant heat than other existed pavements, it can be considered more environment-oriented pavement. Therefore this type of pavement can be successfully applied to the roads, such as bikeways, parkways, and walks, which are required to be human-friendly and environment-oriented.

적응필터 알고리즘을 이용한 도플러 보상기법 최적화 방안 연구

이길용 서울과학기술대학교 2015 국내석사

본 논문에서는 고속열차가 운행 시 발생하는 도플러 효과를 보상하기 위하여 적응필터 알고리즘을 이용한 최적화 방안에 대하여 연구하였다. 최근 철도는 고속열차의 발전과 더불어 지속적이고, 특히 에너지활용 측면에서 효율적인 교통수단으로 그 가치가 더욱 부각되고 있다. 철로 이용효율의 증대와 무인열차제어시스템의 도입을 통하여 무선통신 연구가 철도분야에서 유럽을 중심으로 활발히 진행되고 있다. 여기서 무선통신방식은 열차제어분야에 열차제어를 위한 데이터의 송수신의 신뢰성이 뒷받침되어야 한다. 특히 상용 이동통신에 비해 높은 데이터 송수신 신뢰성이 보장되어야 한다. 고속열차환경에서 무선통신의 데이터 송수신 신뢰성과 관련된 주요 영향 요소에는 도플러 효과가 있다. 도플러 효과는 이동하는 물체의 속도에 따른 주파수 변이로 인한 문제로써, 이동중의 물체가 통신을 하는데 있어 심각한 성능 저하를 가져올 수 있다. 본 논문에서는 이러한 도플러 효과에 관한 정의, 고속열차 통신에 적용될 수 있는 도플러 효과 및 이에 대한 도플러 보상기법을 소개한다. 도플러 효과 보상을 위해 적응필터(Adaptive Filter) 알고리즘을 이용하여 고속으로 열차가 이동시에도 열차무선통신을 안정하게 유지 할 수 있는 방법을 제시하였다. 기존의 필터에는 위너(winer)필터, 칼만(Kalman)필터 등 여러 사람들이 필터에 대한 연구를 하였지만, 위 필터들은 비적응형 고정필터(non-adaptive foxed filter)로서 주위의 환경적 변화에 의해 수시로 바뀌는 잡음신호를 올바르게 필터링을 할 수 없었다. 따라서 환경과 시간에 따라 그 특성이 변화될 때, 필터의 계수값도 변화하는 적응필터(Adaptive filter)를 도입함으로써 주변 환경의 잡음을 최소화 하고자 한다. 또한 적응필터 알고리즘인 LMS, RLS 알고리즘을 통해 얻어진 BER(Bit Error Ratio)값을 시뮬레이션을 하였으며, 시뮬레이션 결과를 통하여 BER값이 도플러 효과가 없는 상태의 값에 가까워지는 것으로 분석되었다. 따라서 도플러 효과를 저감시킴으로써 열차 운행의 신뢰성 및 안전성을 보장 할 수 있다고 판단한다. This paper examined the optimization of Doppler Effect using the adaptive filter algorithm to complement the Doppler Effect that occurs while a high speed train runs. With the development of high speed train, the value of railroad is highlighted recently as a sustainable and efficient means of transportation, especially in terms of energy use. Through the increase of railroad use efficiency and the adoption of driverless train control system, studies on wireless communications in the railway field have been conducted actively around Europe. Here, wireless communications must be supported by the reliability of data transmission to the train control field for controlling trains. High data transmission reliability compared to common mobile communications must be especially guaranteed. In the high speed train environment, Doppler Effect is the main influence factor related to the data transmission reliability of wireless communications. As a problem caused by the frequency change due to the speed of a traveling object, Doppler Effect can bring a severe performance decline for objects to communicate while traveling. This paper introduces the definition of Doppler Effect, how the effect can applied in high speed train communications, and Doppler Compensation Technique. To compensate the Doppler Effect, the paper proposed using adaptive filter algorithm how to maintain the wireless communications stable even when the train travels in a high speed. While many researchers have analyzed existing filters such as winner filter, Kalman filter, etc., these filters were non-adaptive fixed filters and could not properly filter the noise signals that frequently changed according to surrounding environmental changes. Therefore, the paper seeks to minimize the noise of surrounding environment by adopting an adaptive filter in which its coefficient value changes when its characteristics change according to the environment and time. Also, the paper simulated the BER (Bit Error Ratio) obtained through LMS and RLS algorithms, which were adaptive filter algorithm, and analyzed that the BER value drew closer to the condition without the Doppler Effect through the simulation result. Therefore, the paper judges that the reliability and safety of train can be guaranteed by reducing the Doppler Effect.

포천시의 도시 이미지 결정요인에 관한 연구

이길용 서울대학교 환경대학원 2012 국내석사

지방자치제도의 도입과 함께 도시 경쟁력 확보의 중요성이 부각되었고, 각 지방정부들은 도시 경쟁력 강화 및 지역경제 발전을 위해 도시 이미지를 제고시키려고 많은 노력을 기울이고 있다. 이에 따라 도시 이미지에 관한 다양한 연구들이 진행되었으나 대부분의 연구는 물리적인 요인을 중심으로 도시이미지를 파악하였으며, 도시 내 다양한 계층 간 도시 이미지 차이를 반영하지 못하고 있다. 이러한 배경 하에서 본 연구는 도시 경쟁력 확보와 정체성 확립을 위해 도시 이미지 연구가 필요함을 인식하고, 도시 이미지를 결정하는 요인을 추출하는 것을 목적으로 하였다. 특히 선행 연구에서 초점을 두고 있는 물리적인 환경뿐만 아니라 사회자본과 같은 비 물리적 요인들을 포함시켜 구조방정식 모형을 설정하고 각 요인과 도시이미지 간의 구조적 관계와 영향력을 파악하였다. 또한 계층별 도시 이미지 결정요인 차이를 비교·분석함으로써 정책적 시사점을 제시하고자 하였다. 본 연구는 경기도 포천시를 대상으로 하였다. 선행연구를 바탕으로 도시 이미지 결정에 영향을 미치는 여섯 가지 요인으로 사회자본, 교육·서비스, 자연·역사, 주거환경, 물리적 환경, 경제·산업을 선정하였고, 이를 바탕으로 연구모형과 가설을 설정하였다. 구조화된 설문지를 통해 자료를 수집하였으며, 요인분석과 신뢰도분석을 실시하여 수집된 자료의 타당성과 신뢰성을 확인한 결과 만족할만한 수준으로 나타났다. 구조방정식을 이용한 모형 적합도에서도 대부분의 적합도 지수가 기준치를 충족하고 있어 수용할 만하다고 판단하였다. 실증 분석 결과 도시 이미지 결정요인으로 선정한 여섯 가지 요인 중 사회자본, 교육·서비스, 자연·자원, 경제·산업요인이 도시 이미지 결정에 정의 영향(+)을 미치는 것으로 나타났으며, 특히 자연·자원 요인이 포천시의 도시 이미지 결정에 가장 큰 영향을 주는 것으로 분석되었다. 그러나 주거환경과 물리환경은 포천시의 도시 이미지에 유의한 영향을 미치지 못하는 것으로 나타났다. 다음으로 계층별 차이를 분석한 결과, 모든 요인에서 계층별 차이가 유의하게 나타났으며, 특히 거주기간별, 성별, 직업별 차이가 뚜렷하게 나타나고 있음을 확인하였다. 본 연구는 기존의 연구에서 도시 이미지 결정요인으로 고려하지 않았던 사회자본 요인이 도시 이미지에 긍정적인 영향을 미치고 있음을 확인했다는 점에서 그 의의가 있다. 이는 사회자본이 높을수록 도시 이미지가 좋게 나타나는 것을 의미하므로, 각 도시들은 지역사회 내에서 시민들의 참여기회를 확대하고 상호교류를 통해서 확고한 네트워크를 형성할 수 있도록 지원함으로써 도시 경쟁력 강화와 지역발전에 기여할 수 있을 것으로 판단된다. 또한 계층별 도시 이미지 차이분석을 통해 각 계층의 특성을 파악함으로써 획일적인 정책 및 계획 수립이 아닌 계층별 전략적 접근에 활용할 수 있을 것으로 기대한다. 한편 연구의 한계점으로는 한 지역을 대상으로 진행하였기 때문에 연구결과를 일반화하기에는 무리가 있을 것이다. 자료수집 과정에서 계층별 표본 배분이 다소 미흡했다는 점에서도 한계를 지닌다. 향후 연구에서는 과학적인 방법을 이용한 전략적 표본추출을 통해 계층 별로 충분한 표본 수를 확보함으로서 좀 더 효과적인 계층 간 도시 이미지 결정요인 차이 비교가 이뤄질 필요가 있을 것이다. As the autonomous local government system launched, local governments started to pour their efforts into improving their city’s image for the enhancement of the city’s competitiveness and local economic development. Since Diverse studies on the city’s image have been carried out, most studies mainly dealt with the physical environment of the city. Considering such circumstances, there is needed to identify the determinant of the city image and the structural relationships among them. This study specifically focuses on not only the physical factors but also the non-physical factors such as the social capital. With these factors, a structural equation model was established and the effects of each determinant on the city image was analyzed. Furthermore, the determinant differences of the city image among social classes have been comparatively analyzed to supply important implications to municipal official and policy-makers. The city of Pocheon was chosen as the study area of this research. Based on previous research analysis, six factors affecting an urban image were selected, namely social capital, education·service, natural environment·history, residential environment, physical environment, and business·industry. Moreover, a research model and hypotheses were established. Data were collected from questionnaires filled out by 420 people living in Pocheon. A factor analysis and reliability analysis results satisfactorily met the standard. Likewise, goodness-of-fit measures of the structural equation model satisfied the standard. The result of the study can be summarized as follows. First, out of the six factors affecting an urban image, social capital, education·service, natural environment·history, and business· industry factor had a positive effect while residential environment and physical environment factor was ineffective. Second, the results of the comparative analysis on the determinant differences of the city image among social classes are as follows. In all factors, there were statistically significant differences among classes. Specially, in groups classified by the length of residence, gender, and occupation a distinct difference was found. The fact that this research took social capital factor into account and found it’s significant effect on the city image is substantial. This result means that the higher level of social capital a city has, the better the city’s image is. Hence, local governments can enhance their competitiveness and local economic development by enlarging their citizen’s opportunities to participate in social activities as well as supporting people to make a strong network within the community. Correspondingly, comparative analysis on the determinant differences of a city image among social classes can help policy-makers to establish strategic policy.