• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권5호
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• pp.1236-1251
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• 2013

Sharing geo-tagged photos has been a hot social activity in the daily life because these photos not only contain geo information but also indicate people's hobbies, intention and mobility patterns. However, the present raw geo-tagged photo routes cannot provide information as enough as complete GPS trajectories due to the defects hidden in them. This paper mainly aims at analyzing the large amounts of geo-tagged photos and proposing a novel travel route restoring method. In our approach we first propose an Interest Measure Ratio to rank the hot spots based on density-based spatial clustering arithmetic. Then we apply the Hidden Semi-Markov model and Mean Value method to demonstrate migration discipline in the hot spots and restore the significant region sequence into complete GPS trajectory. At the end of the paper, a novel experiment method is designed to demonstrate that the approach is feasible in restoring route, and there is a good performance.

• 한국소음진동공학회논문집
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• 제24권6호
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• pp.437-443
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• 2014

Vibration testing is conducted for evaluate the fatigue resistance of responsible system over excitation situations and two kinds of vibration profiles, harmonic or random, are widely used in engineering fields. Harmonic excitation profile is adequate for the rotating machinery that is primarily exposed to the orderly excited force subjected for a rotating speed; Random profile is suitable for the non-stationary vibration input, that is a ground excitation for example. Recently, the sine on random(SOR) testing method was sometimes considered to represent the real excitation conditions since the measured response signals of a target system, expecially for moving mobility, shows usually a mixture of them. So, it is important to understand the accumulated fatigue damage over different excitation patterns, harmonic and/or random, to determine the efficient vibration profile of a target system. A uniaxial vibration testing with a notched simple beam was introduced to evaluate the fatigue damage for different excitation profiles and the best choice of vibration profile was concluded from those comparison of calculated fatigue damages.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2014년도 춘계학술대회 논문집
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• pp.340-345
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• 2014

Vibration testing is conducted for evaluate the fatigue resistance of responsible system over excitation situations and two kinds of vibration profiles, harmonic or random, are widely used in engineering fields. Harmonic excitation profile is adequate for the rotating machinery that is primarily exposed to the orderly excited force subjected for a rotating speed; Random profile is suitable for the non-stationary vibration input, that is a ground excitation for example. Recently, the sine on random (SOR) testing method was sometimes considered to represent the real excitation conditions since the measured response signals of a target system, expecially for moving mobility, shows usually a mixture of them. So, it is important to understand the accumulated fatigue damage over different excitation patterns, harmonic and/or random, to determine the efficient vibration profile of a target system. A uniaxial vibration testing with a notched simple beam was introduced to evaluate the fatigue damage for different excitation profiles and the best choice of vibration profile was concluded from those comparison of calculated fatigue damages.

• 농촌지도와개발
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• 제18권1호
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• pp.1-33
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• 2011

In-migration has long been recognized as on important factor in rural development. Its impact can be expected to increase even further as the elderly population continues to grow. Recently with the retirement of baby boomers, postretirement moves have become increasingly important issue in rural Korea. Because the consequences of rural in-migration are often most pronounced at the local or regional level, rural planners are among the many scholars and practitioners seeking to understand the patterns and consequences of in-migration. At the same time, however, planners have sometimes overlooked basic research on the causes and determinants of mobility, and on the relationships between retirement migration and other socioeconomic processes. The papers aims to explore the reviews of rural in-migration studies and its practical implications, providing an interdisciplinary review of the most important studies published between 1990-2009. Through the literature review of in-migration, this study suggests that main arguments for rural in-imgration studies such as rural populations, counterurbanization, rural businesses incubator and rural amenity be emphasized to vitalize and diversify rural economies.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.186-189
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• 2006

The flexible organic thin film transistor (OTFT) array to use as a switching device for an organic light emitting diode (OLED) was designed and fabricated in the microcontact printing and room temperature process. The gate, source, and drain electrode patterns of OTFT were fabricated by microcontact printing process. The OTFT array with dielectric layer and organic active semiconductor layer formed at room temperature or at a temperature lower than $40^{\circ}C$. The microcontact printing process using SAM and PDMS stamp made it possible to fabricate OTFT arrays with channel lengths down to even submicron size, and reduced the fabrication process by 10 steps compared with photolithography. Since the process was done in room temperature, there was no pattern shrinkage, transformation, and bending problem appeared. Also, it was possible to improve electric field mobility, to decrease contact resistance, to increase close packing of molecules by SAM, and to reduce threshold voltage by using a big dielectric.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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• pp.675-678
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• 2003

We studied the electrical characteristics of pentacene-based organic field-effect transistors (FETs) with polymethyl methacrylate (PMMA) or poly-4-vinylphenol (PVP) as the gate insulator. PMMA or PVP was spin-coated on the indium tin oxide glass substrate that serves as gate electrodes. The source-drain current dependence on the gate voltage shows the FET characteristics of the hole accumulation type. The transistor with PVP shows a higher field-effect mobility of 0.14 $cm^{2}/Vs$ compared with 0.045 $cm^{2}/Vs$ for the transistor with PMMA. The atomic force microscope (AFM) images indicate that the grain size of the pentacene on PVP is larger than that on PMMA. X-ray diffraction (XRD) patterns for the pentacene deposited on PVP exhibit a new Bragg reflection at $19.5{\pm}0.2^{\circ}$, which is absent for the pentacene on PMMA. This peak corresponds to the flat-lying pentacene molecules with less intermolecular spacing.

• Mass Spectrometry Letters
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• 제7권4호
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• pp.96-101
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• 2016

To determine the influence of the cationization agent on the collision activated dissociation (CAD) fragmentation behavior of oligosaccharides, the CAD spectra of the singly protonated, sodiated oligosaccharides and singly sodiated and dibenzo-18-crown-6 ether conjugated oligosaccharides were carefully compared. Each of these three different species showed quite different fragmentation spectra. The comparison of singly protonated and sodiated oligosaccharide CAD spectra revealed that different cationization agents affected the cationization agent adduction sites as well as the fragmentation sites within the oligosaccharides. When the mobility of $Na^+$ was limited by the dibenzo-18-crown-6 ether encapsulation agent, the examined linear oligosaccharides showed fragmentation patterns quite different from the unmodified ones. For the dibenzo-18-crown-6 ether conjugated oligosaccharides, the charge-remote fragmentation pathways were more likely to be activated than the chargedirected pathways. This work demonstrates that dibenzo-18-crown-6 ether conjugation can potentially provide a route to selectively activate the charge-remote fragmentation pathways, albeit to a limited extent, in tandem mass spectrometry studies.

• Journal of mucopolysaccharidosis and rare diseases
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• 제2권1호
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• pp.8-12
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• 2016

Mucolipidosis (ML) is a kind of skeletal dysplasia. Characteristic X-ray findings of the bone may contribute to the early diagnosis and treatment of ML II/III. Skeletal radiographs show distinctive patterns at different ages: neonatal hyperparathyroidism, osteodystrophy (similar to chronic osteitis fibrosa cystica), and dysostosis multiplex. Patients with ML II/III show a mixture of osteodystrophic bone changes and atypical changes of dysostosis multiplex: proximal pointing of the metacarpals in the wrist, dysplastic changes in the lower third of the ilia, marked broadening of the ribs becoming oar-shaped, and beaking of the lower thoracic and lumbar vertebrae. In ML II, the osteodystrophy has clinical and radiographic features of neonatal hyperparathyroidism. In some neonatal subjects, chemical hyperparathyroidism is also demonstrated. After transient hyperparathyroidism in newborns, the progressive osteitis fibrosa cystica develops from 3-6 months of age. Patients with ML III show prominent skeletal involvement, particularly the destruction of vertebral bodies and the femoral heads. Intravenous pamidronate treatment is well tolerated, and it can produce clinical effects, with a reduction in bone pain and improvements in mobility in patients with ML III. In this review, the skeletal manifestations of ML II and III are investigated.

• 노동경제논집
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• 제24권1호
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• pp.149-176
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• 2001

본 논문에서는 한국 사회에서 세대내 직업경력의 유형을 찾고자 최적일치법을 이용하여 남성과 여성의 직업경력 분석하였다. 남성과 여성은 직업경력에서 상당한 차이를 보이며 남성의 경우 공백이 거의 없이 직업경력이 이어지는 반면, 여성은 직업경력이 일찍 종결되거나 상당한 공백을 두고 경력이 단절되는 경향을 보인다. 남성의 경우 경력의 공백이 생기는 경우는 농업직으로부터 기타 직업으로의 이동에 국한된다. 최적일치법과 집락분석을 결합하여 남성과 여성의 직업경력을 유형화한 결과 남성은 직업별로 유형 구분이 잘 되어 나타나는 반면, 여성은 주로 경력의 지속기간에 의해 유형이 구분된다. 남성에 비해 여성은 직업경력이 단절되며, 이는 가사와 육아의 부담, 그리고 여성의 경력을 지속하는 데 대한 사회적 차별에 기인하는 것으로 추정된다.

• 한국자동차공학회논문집
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• 제20권5호
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• pp.19-25
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• 2012

This study describes effects of DME additives on combustion and exhaust emissions characteristics including nano-particle in a single cylinder compression ignition engine. Considered additives include bio-diesel, n-butanol, and MTBE for increasing kinematic viscosity. Among three additives, n-butanol showed the greatest kinematic viscosity. In addition MTBE showed the highest vapor pressure. In the present study mixing ratios of additives were kept constant at 1 and 10% by volume. Experiments were performed at 1200rpm engine speed and nano-particles were measured by SMPS (Scanning mobility particle sizer) devices. Results of combustion characteristics showed that considered additives had little effects on combustion pressure. However, patterns of heat release rate were dependent on properties of additives. Nano-particles of MTBE were the lowest among considered additives.