Woo-Sung Jung

Nanostructured superhydrophobic silicon surfaces with tunable reflectance are fabricated via a simple maskless deep reactive-ion etching process. By controlling the scale of the high-aspect-ratio nanostructures on a wafer-scale surface, surface reflectance is maximized or minimized over the UV-vis-IR range while maintaining superhydrophobic properties.

본 연구에서는 대학의 기술이전 및 성과 확산에 미치는 영향력에 대해 대학 차원의 역량 강화와 정부차원의 인프라 마련 두 가지 측면에서 확인하였다. 먼저 대학과 정부의 연구개발지원이 기술이전 및 확산에 미치는 영향을 분석한 결과 연구개발 인센티브와 정부의 이공계부문 재정지원이 기술이전성과에 중요한 영향을 미치는 것으로 나타났다. 둘째, 대학과 기업의 중개기관적 역할을 수행하는 산학협력단의 규모와 전문성 그리고 기술이전전담조직(Technology Licensing Office: TLO)의 별도 설립을 통한 전문성과 대학내부의 역량강화가 기술이전 수입 증대에 중요한 영향요인으로 확인되었다. 그리고 재정지원사업 참여대학들은 기술이전성과에 이공계 전임교원의 확보와 해외특허비용지원이 중요한 것으로 나타났고, 기술이전건수의 경우는 수도권 대학에서 영향력을 확인할 수 있었다. 또한 기술이전수입 증대에 교원평가항목에서 산학협력실적반영이 긍정적 영향력을 보여준다. 셋째, 재정지원사업 비수혜대학의 경우

We report a novel method to form a circular pattern of monodisperse microdroplets using an electrohydrodynamic repulsion (EDR) mechanism. EDR is a phenomenon of electrostatical bounced microdroplets from an accumulated droplet on a bottom substrate. In addition to a regular EDR system, by placing a ring electrode between the capillary and ground substrate, two separate regions were created. A parameter study of two regions was carried out for droplet formation and falling velocity to control the

One of Aesop’s (La Fontain’s) famous fables ‘The Ant and the Grasshopper’ is widely known to give a moral lesson through comparison between the hard working ant and the party-loving grasshopper. Here we show a slightly different version of this fable, namely, “The Ant and the Metrohopper”, which describes human mobility patterns in modern urban life. Numerous real transportation networks and the trajectory data have been studied in order to understand mobility patterns. We study trajectories of

본 연구에서는 기업가적 대학으로의 역할 확대의 이론적 검토와 이러한 현상을 산업경제 차원에서 논의하였고, 그에 따라 대표적인 국내 연구중심대학 사례를 검토하였다. 대학 역할 확대의 관점은 대학 내 기업연계조직의 확대와 전통적인 대학 기능의 기업가적 대학으로의 변화로 정의하였다. 이러한 관점에 기인하여 국내 연구중심대학인 POSTECH의 사례를 분석하였다. 분석결과, 첫째, 기업연계조직은 기술이전조직, 창업지원조직 등 선진국 수준에서 조직이 갖추어진 상황이다. 반면, 대부분의 기업연계 조직이 최근 5년 내 설립되었으며 최근 일부 성과가 창출하고 있다. 둘째, 전통적인 대학 기능의 기업가적 대학으로의 변화는 일부 학과와 프로그램을 중심으로 진행되고 있는 것으로 확인되었다. 기업가적 대학의 두 가지 요소 중 산업경제에 미치는 영향력은 단기적으로 대학 내 기업연계 조직이 지역 산업경제 선순환에 긍정적 영향을 주었고, 전통적인 대학 기능변화는 장기적인 차원에서 경제의 순기능(기업가적 인재양성

The application of nanomaterials for biosensors and fuel cells is becoming more common, but it requires an understanding of the relationship between the structure and electrochemical characteristics of the materials at the nanoscale. Herein, we report the development of scanning electrochemical microscopy-atomic force microscopy (SECM-AFM) nanoprobes for collecting spatially resolved data regarding the electrochemical activity of nanomaterials such as carbon nanotube (CNT) networks. The fabricat

We analyze the return intervals in Korean stock prices. While scaling and memory effects prevail in mature markets, such as the US and Japanese markets, the Korean market does not exhibit the scaling effect, but rather the memory effect. Multiscaling behavior appears as well. Interestingly,the return interval distribution of the Korean market shows neither a stretched exponential nor an exponential distribution. We propose that the features we have found can be a distinct feature of the Korean m

MEMS gyroscopes have favorable characteristics, including small size, high throughput, and low cost. The performance of MEMS gyroscopes depends on the displacement sensitivity of the capacitors. In this paper, we describe the fabrication of 300-mu m-thick gyroscopes that can provide high displacement sensitivity and are robust to fabrication tolerances, i.e. deep reactive ion etch (DRIE) rate uniformity. When thick structures are perforated using DRIE to achieve high-aspect-ratio features, footi

To detect a signal change in nano scale, Schottky barrier - silicon nanowire field effect transistor (SB-SiNWFET) for detecting a bio-molecule was fabricated by combining E-beam lithography and conventional MEMS technique. Detection of few bio-molecules is enabled by realizing the gold nanodots on silicon nanowire (SiNW). By performing pH test and carbohydrate binding measurement, we conclude that our sensor can detect very small quantity of biomolecules.

The transfer market for sport players presents an interesting issue both for the people who are directly involved with it and for the many fans. Although attempts have been made to understand it from a perspective of economy and management, an analysis from the view point of a complex system remains in the initial stages. In this research, we analyzed the transfer market of European football leagues as a weighted network in order to understand the detailed transfer patterns. A Google-based stand

The resonance frequency of a MEMS resonator was adjusted using CNT wire synthesis on the side of the resonator. The resonance frequency tuning method was examined by a simple MEMS cantilever model in this report. The simple cantilever was made using MEMS processes and main material of the model was low stress silicon nitride film. The resonance frequency of the MEMS cantilever was measured with laser vibrometer. The cantilever had bumps on its side to synthesize wires. The resonance frequency wa

As research management is growing in importance for research organizations, their disciplinary structures need to be interpreted. However, it is not only difficult but ambiguous to detect causal relations between subjects because diverse disciplines interacting with each other lead the development of organizational research. Therefore, this article summarizes the major concepts and results recently achieved in the related fields such as research management, bibliographic analysis, information th

Keyword indexed in multidisciplinary journals show trends about science and technology innovation. Nature and Science were selected as multidisciplinary journals for our analysis. In order to reduce the effect of plurality of keyword, stemming algorithm were implemented. After this process, we fitted growth curve of keyword (stem) following bass model, which is a well-known model in diffusion process. Bass model is useful for expressing growth pattern by assuming innovative and imitative activit

We investigate the relative market efficiency in 11 foreign exchange markets by using the Lempel- Ziv (LZ) complexity algorithm and several entropy values such as the Shannon entropy, the approximate entropy, and the sample entropy. With daily data in 11 foreign exchange markets from Jan. 2000 to Sep. 2011, we observe that mature markets have higher LZ complexities and entropy values than emerging markets. Furthermore, with sliding time windows, we also investigate the temporal evolutions of tho

In the following paper, the high frequency oscillation proximity sensor system, one of the sensor systems used in FA, is designed using CMOS. According to the proximity of metal objects, two differing amplitudes of sinusoidal waves are set, and by using rectifiers, dc voltages, which determine the constant current source circuit's output current levels, can be abstracted from these waves. To remove any disturbances in the dc voltage levels, a schmitt trigger is used. Some advantages of this CMOS