• Journal of the Korean Geographical Society
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• v.39 no.1
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• pp.116-131
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• 2004

The purpose of this study is to inquiry spatial features of shipbuilding subcontract structures. These days, firms are trying to get their goals by wav of production system which is related to other firm. Shipbuilding subcontract structures which builds complex and grand plant show a different peculiarity according to spatial features having rules of business relations with contracting firms. First of all, internal subcontracting firms which takes part in the production process of contracting firm and shipbuilding cooperative complex firms which showing a peculiarity of spin-off firms are closely related with contracting firm. And firms in Changwon that have a specialized with machine industry and those of Busan that have made development in marine equipment industries traditionally are connected with subcontract relations because of a high level of specialization relatively. On the other hand, subcontracting firms which range from non-localized and provide standardized products are less connected with contracting firm. In order to develop of Korea' shipbuilding industry, first, close cooperative relation is important with subcontracting firms which concentrate internal and outside contacting firm. And, it is necessary to strengthen selective business relations with far distance firms which are specialized in technology.

• Journal of the Korean Academic Society of Industrial Cluster
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• v.1 no.1
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• pp.29-46
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• 2007

The purpose of this paper is to analyses current status and issues of cluster formation and extract policy implications. To this end, the questionnaire which surveyed the level of cluster formation were executed targeting the actors of regional innovation projects(RIPs). The results show that the situations and development stage of the cluster formation between capital region and non-capital region, large cities and small and medium sized cites are different. The level of clustering is also satisfactory, which is a requirement for cluster formation at its early stage. However, the capacity for phase II of cluster growth is not sufficient yet in terns of relationships between ventures and large corporations, institutions supporting management, finance and marketing, researchers from each individual sector of strategic industries and spin-off fines. Therefore, RIPs should be promoted with different policy tools for various regions that are devised according to the varying development stage of each region. The location of RIPs should be determined considering efficiency rather than equity, clustering rather than decentralization, and specialization rather than multiple development. In the long term, developed regions should pursue balanced regional development, with underdeveloped regions targeting specialization.

• Journal of the Economic Geographical Society of Korea
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• v.6 no.1
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• pp.171-191
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• 2003

Today universities are regarded as one of the key institutions in the national and regional innovation systems. First of all the diffusion and distribution of the knowledges, technologies, information and know-hows from higher educations to regions are capable of promoting an innovation-led regional development. This study aims to evaluate the transfer and spatial diffusion of knowledge and technology from the Chonnam National University(CNU) in Kwangju to the regions and to focus the analysis of the technology transfer, personnel transfer and spin-off development. The results show that there are some differences in the spatial range and effects of the knowledge and technology transfer of the CNU by the type of transfers. And the Analysis provide evidence that the knowledge and technology distributions from the CNU make more and less positive contribution to regional developments.

• Korean Journal of Materials Research
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• v.21 no.2
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• pp.115-119
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• 2011

Si Nanowire (NW) field effect transistors (FETs) were fabricated on hard Si and flexible polyimide (PI) substrates, and their electrical characteristics were compared. Si NWs used as channels were synthesized by electroless etching method at low temperature, and these NWs were refined using a centrifugation method to get the NWs to have an optimal diameter and length for FETs. The gate insulator was poly(4-vinylphenol) (PVP), prepared using a spin-coating method on the PI substrate. Gold was used as electrodes whose gap was 8 ${\mu}m$. These gold electrodes were deposited using a thermal evaporator. Current-voltage (I-V) characteristics of the device were measured using a semiconductor analyzer, HP-4145B. The electrical properties of the device were characterized through hole mobility, $I_{on}/I_{off}$ ratio and threshold voltage. The results showed that the electrical properties of the TFTs on PVP were similar to those of TFTs on $SiO_2$. The bending durability of SiNWs TFTs on PI substrate was also studied with increasing bending times. The results showed that the electrical properties were maintained until the sample was folded about 500 times. But, after more than 1000 bending tests, drain current showed a rapid decrease due to the defects caused by the roughness of the surface of the Si NWs and mismatches of the Si NWs with electrodes.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.380-380
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• 2013

본 논문에서는 외기 환경 요인 중에서 H2O와 O2의 영향으로 성능이 저하되는 유기박막트랜지스터(OTFT)의 수명시간 향상을 위하여 필요한 passivation layer의 효과에 대하여 알아 보았다. OTFT에 기존의 액상 공정이나 증착 공정으로 단일 passivation layer또는 다층 passivation layer를 형성하는 방식과는 다르게 향후에 산업 전반에 적용이 기대되는 것을 고려하여 제작 공정의 간편성을 위하여 film 형태로 되어 있는 열경화성 epoxy resin film으로 passivation layer를 구현하는 방법을 사용하여 OTFT의 storage stability를 평가하였다. passivation layer가 없는 OTFT와 열경화성 epoxy resin film으로 passivation된 OTFT의 전기적 특성이 서로 비교 평가되었으며 또한 30일 동안 온도 $25^{\circ}C$ 상대습도 40%의 환경을 갖는 Desicator 안에서 소자를 보관하여 시간에 따른 전기적 특성 변화를 검증하여 epoxy resin film의 passivation layer으로의 적용가능성을 검증하였다. 결과적으로 30일 후의 passivation layer가 없는 OTFT의 전기적 특성은 매우 낮게 떨어진 반면에 epoxy resin film으로 passivation layer가 구현된 OTFT의 mobility는 $0.060cm^2$/Vs, VT는 -0.18 V, on/off ratio는 $3.7{\times}10^3$으로 초기의 소자 특성이 잘 유지되는 결과를 얻었다. OTFT는 Flexible한 polyethersulfone (PES)기판에 게이트 전극이 하부에 있는 Bottom gate 구조로 제작되었고 채널 형성을 위한 유기반도체 재료로 6,13-bis (triisopropylsilylethynyl) (TIPS) pentacene이 사용되었고 spin coating된 Poly-4-vinylphenol (PVP)가 게이트 절연체로 사용되었다. 이때 Au전극은 Shadow mask를 이용하여 증착하였다. 또한 OTFT의 채널 길이 $100{\mu}m$, 채널 폭 $300{\mu}m$의 영역에 Drop casting법을 사용하여 채널을 형성하였다. 물리적 특성은 scanning electron microscopy (SEM), scanning probe microscopy (SPM), x-ray diffraction (XRD)를 사용하여 분석하였고, 전기적 특성은 Keithley-4200을 사용하여 추출하였다.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.379-379
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• 2013

본 논문에서는 Normal ink jetting 공법으로 OTFT를 제작할 때 coffee stain effect에 의해서 반도체 소자의 특성이 저하되는 것을 극복하기 위해서 동일한 위치에 동일한 부피로 Droplet을 형성하는 Multiple ink jetting 공법을 통해 TIPS pentacene 결정의 Morphology와 전기적 특성이 어떻게 변화하는지 알아 보았다. Multiple ink jetting의 drop 횟수가 증가할수록 coffee stain effect에 의해서 형성된 가운데 영역의 Dendrite grain이 점점 작아지다가 7 Drops 이후로는 Big grain 만 남게 되었다. Active layer의 표면 Roughness는 drop 횟수가 증가할수록 낮아지다가 일정 count 이후로는 다시 높아지는 것을 확인할 수 있었다. 전계 이동도(mobility)는 drop 횟수가 증가할수록 커지다가 일정 count 이후로는 saturation되는 것을 확인할 수 있었다. Multiple ink jetting에 의해서 만들어진 OTFT 소자의 전계 이동도(mobility)는 1 drop과 10 drops에서 각각 0.0059, 0.036 cm2/Vs 로 6배 정도 차이가 있었다. 이것은 첫 drop에 의해 만들어진 가운데 Dendrite grain 영역이 Multiple ink jetting을 반복하면서 점점 작아지게 되어 사라지고 두꺼운 Grain 영역만 남게 된 것으로 판단된다. Vth 와 On/Off ratio는 1 drop과 10 drops에서 각각 -3 V, -2 V 그리고 $3.3{\times}10^3$, $1.0{\times}10^4$를 보였다. OTFT의 substrate로 Flexible한 polyethersulfone (PES) 기판을 사용하였고, 절연체로 Spin coating된 Poly-4-vinylphenol (PVP)가 사용되었으며, Gate 및 Source/Drain 전극은 Au를 50 nm 두께로 증착하였다. Channel의 width와 length는 각각 100 um, 40 um 였고, Gate 전극 위에 Active layer를 형성한 Bottom gate 구조로 제작되었다. Ink jet으로 제작된 TIPS pentacene의 결정성은 x-ray diffraction (XRD)와 광학 현미경으로 분석하였고 Thickness profile은 알파스텝 측정기를 이용하였으며, OTFT의 전기적 특성은 Keithley-4,200을 사용하여 측정하였다.

• Journal of the Korean association of regional geographers
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• v.12 no.1
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• pp.108-123
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• 2006

This study attempts to analysis the roles of national laboratories in the context of regional innovation systems and the contribution to local economic development in the case of Taedok Science Park in Korea. It also tries comparative studies between Taedok Science Park and some European experiences. Recently the role of national laboratories as key innovation agents for regional development strategies is emphasized in European countries. In the similar context, national laboratories have explicit missions to assist in the formations of new firms and to support existing small and medium-sized enterprises in their localities. It is found that these functions are largely present and become more important in Taedok, but that the linkages between national laboratories and local firms are still weaker than some European countries. This study concludes that national laboratories in Korea should reinforce the industry-research linkages with local economic activities in the region to stimulate cooperation activities.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.13 no.6
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• pp.509-513
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• 2000

The physical and electrical characteristics of MgO and Pt thin-films on it deposited by reactive sputtering and rf magnetron sputtering respectively were analyzed with annealing temperature and time by four point probe SEM and XRD. Under annealing conditions of 100$0^{\circ}C$ and 2 hr, MgO thin-film had the properties of improving Pt adhesion to SiO$_2$and insulation without chemical reaction to Pt thin-film and the sheet resistivity and the resistivity of Pt thin-film deposited on it were 0.1288 Ω/ and 12.88 $\mu$$\Omega$.cm respectively. We made Pt resistance pattern on SiO$_2$/Si substrate by life-off method and fabricated Pt thin-film type microheater for thermal microsensors by Pt-wire Pt-paste and SOG(spin-on-glass). In the temperature range of 25~40$0^{\circ}C$ we estimated TCR(temperature coefficient of resistance) and resistance ratio of thin-film type Pt-RTD(resistance thermometer device). We obtained TCR value of 3927 ppm/$^{\circ}C$ close to the bulk Pt value. Resistance values were varied linearly within the range of the measurement temperature. The thermal characteristics of fabricated thin-films type Pt micorheater were analyzed with Pt-RTD integrated on the same substrate. The heating temperature of Pt microheater could be up to 40$0^{\circ}C$ with 1.5 watts of the heating power.

• Journal of Korean Library and Information Science Society
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• v.49 no.2
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• pp.25-58
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• 2018

This study analyzed the agriculutral book Gyemi Metal Type Sasichanyo which was produced in Jujaso(鑄字所), by early Joseon dynasty's king Taejo(太宗). It is the most advanced edition of Sasichanyo("四時纂要") among whole east-northern Asia, which contains miscellanies about monthly agricultural plan(月令式 農家雜錄) and the themes are; agriculture, production spin-off processing, sanitation and medicine, tool fixing and conservation, business management. This research divided all letters appeared in Gyemi metal type Sasichanyo("四時纂要") by three categories; small letters, smaller letters, smallest letters to define its' function and characteristics and estimated the value of Sasichanyo("四時纂要"). Also in the aspect of typeface of letters and typesettings, this study compared all editions of Sasichanyo("四時纂要") with Gyemi metal type Sasichanyo("四時纂要").

• The Journal of Korean Institute for Practical Engineering Education
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• v.3 no.1
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• pp.119-126
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• 2011

This study analyzed the effect of the competency factors (resources and education competency)on the performance of university-industry cooperation by characteristic of universities through multiple regression model using 202 datasets empirically. The input factors variables used in a research model were characteristics of universities (research oriented/education-oriented universities and public/private universities) and competency factors (resource competency and education competency) of university-industry cooperation. The performance factors of university-industry cooperation were composed of the outcomes of intellectual knowledge asset, technology transfer, spin-off and financial profits. The empirical results show that research-oriented universities and public universities produce a uniter performance of university-industry cooperation than education-oriented universities and private universities, respectively and the competency factors of university-industry cooperation such as resource and education competency also have a positive effect on the performance of university-industry cooperation.