• Journal of the Korean association of regional geographers
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• v.19 no.1
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• pp.45-59
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• 2013

This paper was to examine the spatial characteristics on the mobile industry's value chain based on the structure of value chain, the process of development, and the industrial linkages of mobile industry in Daegu-Gyeongbuk region. The mobile industry's value chain in Daegu-Gyeongbuk region consists of the infrastructure, mobile device, platform & embedded SW, and mobile contents sector. Among these sectors, the leading value chain sector in mobile governance is the mobile device sectors, especially the finished products sector. These sectors have developed by policies as well as networks with large enterprises such as Samsung and LG, and it forms a hub-and-spoke cluster. The infrastructure and mobile device sector are located in Gumi, Gyeongbuk, the embedded SW and mobile contents sectors are located in Daegu, which means decentralized agglomeration. The sectors of infrastructure and mobile device form the strong forward-backward linkages with firms in Daegu-Gyeongbuk region. For the embedded SW sector, the forward-backward linkages are active with firms located in Seoul metropolitan area. For mobile contents sector, the backward linkages are formed with firms in Daegu and the forward linkages are formed with firms in Seoul metropolitan area.

• Journal of Biomedical Engineering Research
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• v.44 no.6
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• pp.404-413
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• 2023

In this research, we studied the development of a SUS304 microneedle array based on microfabrication technology and the applicability of Parylene-C thin film, a medical polymer material. First of all, four materials commonly used in the field of medical engineering (SUS304, Ti, PMMA, and PEEK) were selected and a 5 ㎛ Parylene-C thin film was deposited. The applicability of Parylene-C coating to each material was confirmed through SEM analysis, contact angle measurement, surface roughness(Ra) measurement, and adhesion test according to ASTM standards for each specimen. Parylene-C thin film was deposited based on chemical vapor deposition (CVD), and a 5 ㎛ Parylene-C deposition process was established through trial and error. Through characteristic experiments to confirm the applicability of Parylene-C, SUS304 material, which is the easiest to apply Parylene-C coating without pretreatment was selected to develop a microneedle array based on CNC micromachining technology. The CNC micromachining process was divided into a total of 5 steps, and a microneedle array consisting of 19 needles with an inner diameter of 200 ㎛, an outer diameter of 400 ㎛, and a height of 1.4 mm was designed and manufactured. Finally, a 5 ㎛ Parylene-C coated microneedle array was developed, which presented future research directions in the field of microneedle-based drug delivery systems.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2022.06a
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• pp.242-243
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• 2022

코로나 팬데믹으로 세계가 큰 피해를 보고 있다. 기존 얼굴인식 보안시스템이 마스크 사용자 인식이 어려워 마스크 사용자를 인식할 수 있는 방안이 필요하다. 얼굴인식을 위한 영상처리 기술이 딥러닝에 의해 크게 발전하고 있으며, 여전히 전처리 기술 또한 중요하다. 본 논문에서는 영상처리 기술의 선명도 평가 함수와 YOLOv5를 사용해 학습 재학습 이후 변화하는 성능을 확인하였고, 비마스크 사용 시 분류정확도가 1%, 학습 손실률에서 0.2% 정도의 성능 개선을 확인하였다.

• KAPE Magazine
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• s.229
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• pp.13-16
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• 2015

9월이다. 하늘이 한층 높아졌고, 커진 일교차에 카디건 하나쯤은 필수로 챙기게 된다. 입추가 지난 지는 오래요, 이슬이 내리기 시작한다는 백로도 이미 지났다. 어딜 봐도 분명 가을이다. 그런데 왜 바깥 온도는 30도가 넘고, 뙤약볕은 모든 걸 구워버릴 기세로 내리꽂히고 있는 걸까?

• Journal of the Economic Geographical Society of Korea
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• v.17 no.4
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• pp.702-717
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• 2014

The purpose of this paper is to analyze the residential location preference factors by households' characteristics in the case of Daegu Gyeongbuk households. Under this research purpose, firstly, questionnaire survey of Daegu Gyeongbuk was done, and nextly, AHP(Analytic Hierachy Process) with questionnaire survey results was analyzed. The main results of this study are as follows. Firstly, residential location factors most preferred by Daegu Gyeongbuk households is capital gain, followed by living environment, accessibility of public transportation, accessibility of private car traffic and security. Therefore, we can see Daegu Gyeongbuk households prefer investment value and living amenity together as residential location factors. Secondly, according to the results of AHP by age, below 30th prefer accessibility factors, 40th prefer capital gain and school district factors, and above 50th prefer living environment, natural environment and security factors, relatively. Thirdly, according to the results of AHP by household income, low income households prefer living environment and accessibility factors, middle income households prefer capital gain and accessibility factors, and high income households prefer security, accessibility of private car traffic and view/sunlight factors, relatively.

• Journal of the Korean institute of surface engineering
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• v.55 no.6
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• pp.390-397
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• 2022

Parylene-C which was mainly used for industries such as electronics, machinery and semiconductors has recently been in the spotlight in the medical field due to its properties such as corrosion resistance and biocompatibility. In this study we intend to derive a plan to improve the bonding strength of Parylene-C coating with the SUS304 base material for medical use which can be applied to various medical fields such as needles, micro needles and in vitro diagnostic device sensors. Through plasma pretreatment the bonding strength between Parylene-C and metal materials was improved. It was confirmed that the coated surface was hydrophobic by measuring the contact angle and the improvement of the surface roughness of the sample manufactured through CNC machining was confirmed by measuring the surface roughness with SEM. Through the above results, it is thought that it will be effective in increasing usability and reducing pain in patients by minimizing friction when inserting medical devices and in contact with skin. In addition it can be applied to various application fields such as human implantable stents and catheters, and is expected to improve the performance and lifespan of medical parts.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.884-887
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• 2012

무선 센서 네트워크 기술은 상시적으로 물리정보를 획득할 수 있기 때문에 광범위한 응용분야에서 수요가 증가하고 있다. 또한 무선 센서 네트워크에 적용되는 무선 센서 시스템은 일반적으로 배터리를 장착하여 회로에 전력을 공급해주는 방식을 사용한다. 그러나 센서가 적의 기지근처, 인체 조직내 삽입, 건물의 내벽 등과 같이 배터리를 교체할 수 없는 곳에 위치해 있는 경우, 반영구적인 사용에 제한이 있기 때문에 무전원 무선 센서의 개발이 절실히 필요하다. 특히, 이러한 센서를 새롭게 개발하고 검증하려며 센서의 주파수 특성을 분석해야 하는데 기존에는 단순한 파형만을 분석할 수 있는 일반적인 계측기를 사용할 수밖에 없었다. 따라서 본 논문에서는 기존의 계측기보다 유연성 있고 효율적으로 무전원 무선 센서의 개발과 검증이 가능하도록 신호의 모니터링과 신호발생기를 에뮬레이션하는 NI LabVIEW기반의 SAW System Analyzer와 SAW Reader Emulator 시스템을 설계하고 개발하였다.

• Journal of Biomedical Engineering Research
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• v.43 no.6
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• pp.399-408
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• 2022

Because arrhythmia occurs irregularly, it should be examined for at least 24 hours for accurate diagnosis. For this reason, this paper developed firmware software for arrhythmia detection and prevented consumption of temporal and human resources and enabled continuous management and early diagnosis. Prior to the experiment, the interval between the R peaks of the QRS Complex was calculated using the Pan-Tompkins algorithm. The developed firmware software designed and implemented an algorithm to detect arrhythmia such as tachycardia, bradycardia, ventricular tachycardia, persistent tachycardia, and non-persistent tachycardia, and a data transmission format to monitor the collected data based on BLE. As a result of the experiment, arrhythmia was found in real time according to the change in BPM as designed in this paper. And the data quality for BLE communication was verified by comparing the sensor's serial communication value with the Android application reception value. In the future, wearable devices for real-time arrhythmia detection will be lightweight and developed firmware software will be applied.

• Journal of Broadcast Engineering
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• v.27 no.1
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• pp.13-19
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• 2022

Video Object Segmentation (VOS) task requires an amount of labeled sequence data, which limits the performance of the current VOS methods trained with public datasets. In this paper, we propose two effective data augmentation schemes for VOS. The first augmentation method is to swap the background segment to the background from another image, and the other method is to play the sequence in reverse. The two augmentation schemes for VOS enable the current VOS methods to robustly predict the segmentation labels and improve the performance of VOS.

• Journal of the Korean Regional Science Association
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• v.32 no.4
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• pp.19-38
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• 2016

This study investigates the effects of real exchange rate (RER) on firm level mark-up and export. Using firm level data in Daegu-Gyeongbuk manufacturing industries during 2006-2013, we find that firms adjust their markup in response to the RER changes and this adjustment is heterogeneous with respect to firm and industry characteristics. In particular, an increase in markup following the RER depreciation is greater for firms with lower intermediate input import and higher industry concentration. However, productive firms in this region increase their export, instead of markup, during the RER depreciation. This implies that the productive firms in the region may not retain significant market power: They do not change the final price in local currency to increase selling volume during the RER depreciation (the export price in foreign currency decreases).