고가 선형공원의 녹지계획 사례연구

박청인 ( Chung-in Park ),이주영 ( Juyoung Lee ) 한국환경과학회 2019 한국환경과학회지 Vol.28 No.2

Elevated linear parks have the potential to support the ecological stability, city amenity, cultural opportunity, and health benefits of urban dwellers; these are increasingly becoming an integral part of the urban infrastructure. Due to structural limitations in space, linear parks need to be planned to increase the value of green space. This study was aimed at advancing urban planning techniques for increasing the value of elevated linear parks, by comparing the Seoullo7017 with the Promenade plantee and the Highline. Planning characteristics of these green spaces were analyzed from the perspectives of physical planning factors, amenity values for users, and management systems. Field surveys and virtual tools were used to investigate the current characteristics of these parks, in addition to the literature survey. From the analysis of planning factors, amenity values, and management in the three linear parks, following important recommendations were made in order to promote the values of these parks: (a) diversify planting design for increasing the diversity of green space in a narrow area; (b) bring in various forms of amenities to promote the quality of users' experience; and (c) establish community-based management systems for enhancing regional competitiveness and profit sharing in urban regeneration projects.

Flexible Transparent Conductive Films with High Performance and Reliability Using Hybrid Structures of Continuous Metal Nanofiber Networks for Flexible Optoelectronics

Park, Juyoung,Hyun, Byung Gwan,An, Byeong Wan,Im, Hyeon-Gyun,Park, Young-Geun,Jang, Junho,Park, Jang-Ung,Bae, Byeong-Soo American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.24

<P>We report an Ag nanofiber-embedded glass-fabric reinforced hybrimer (AgNF-GFRHybrimer) composite film as a reliable and high-performance flexible transparent conducting film. The continuous AgNF network provides superior optoelectronic properties of the composite film by minimizing transmission loss and junction resistance. In addition, the excellent thermal/chemical stability and mechanical durability of the GFRHybrimer matrix provides enhanced mechanical durability and reliability of the final AgNF-GFRHybrimer composite film. To demonstrate the availability of our AgNF-GFRHybrimer composite as a transparent conducting film, we fabricated a flexible organic light-emitting diode (OLED) device on the AgNF-GFRHybrimer film; the OLED showed stable operation during a flexing.</P>

우울 수준에 따른 가상멀미 경험이 가상현실 기반 신경인지과제 수행에 미치는 영향 : 고령집단을 중심으로

김인하(Kim, Inha)박정훈(Park, Junghun),이서정(Lee, Seojung),민성(Min, Sung),전주영(Jeon, Juyoung),조건우(Cho, Geonwoo),박혜연(Park, Haeyean),박다솔(Park, Dasol)박수현(Park, Soohyun) 한국재활심리학회 2021 재활심리연구 Vol.28 No.1

본 연구는 고령 집단에서 가상현실기반 평가 및 치료를 활용하는데 있어, 주요 장애물이 될 수 있는 가상멀미의 영향을 탐색하기 위해 진행되었다. 이 가운데서도 신경인지과제 수행 시, 우울감의 수준에따라 가상멀미가 과제수행에 미치는 영향을 탐색하고자 하였으며, 이를 확인하기 위하여 만 50세 이상성인 73명이 (1) 가상현실 기반 신경인지과제, (2) 가상멀미 수준과 우울을 측정하는 자기보고식 설문을 완료하였다. 연구 결과, 우울감이 클수록 가상현실 프로그램 시행에 따른 가상멀미 변화량이 커지는 경향을 보이며, 준임상 수준 이상에 해당하는 고우울 집단에서는 가상멀미가 가상현실기반 신경인지과제 수행에 유의한 영향을 미치는 것으로 나타났다. 저우울 집단에서는 이러한 영향이 유의하지 않았다. 이를 통해 준임상수준 이상의 고우울 집단에서는 지각된 가상멀미 수준이 가상현실기반 신경인지과제 수행에 부정적 영향을 미칠 수 있음이 시사되었다. 이러한 결과는 향후 고령의 우울집단에서 가상현실 치료를 활성화하기 위해, 주요 부작용인 가상멀미의 영향을 확인했다는 점에서 의의가 있으며, 이를 비롯한 본 연구의 의의와 한계점 및 후속 연구에 대해 논의하였다. This study was conducted to explore the effects of simulator sickness, which can be a major obstacle in the use of virtual reality-based evaluation and treatment in the elderly group. Also, the effect of depression level on simulator sickness and a virtual reality (VR)-based neurocognitive task performance was investigated. Seventy-three participants over the age of 50 years completed the (1) VR-based neurocognitive task and (2) self-report questionnaires measuring simulator sickness, and depressive symptoms. The results indicated that depression predicts the severity of perceived simulator sickness, and simulator sickness had a significant effect on the performance of the virtual reality-based neurocognitive task in a group with sub-clinical or clinical levels of depression. Based on the results, the implications, limitations and suggestions for future studies were discussed.

A Novel Approach to One-to-many UCC Delivery

Juyoung Park,Jong-min Lee,Young-hyun Kim,Shin Gak Kang 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7

Live UCC (User Created Contents) distribution is an emerging killer application for IP multicast because IP multicast shows very strong advantage for group communication services; but several deployment issues deter IP multicast from being deployed in the current Internet. Therefore, we introduce an alternative solution to provide an efficient data delivery for one-to-many UCC distribution in the current unicast-based Internet and show the test results of the proposed mechanism.

Gastrointestinal tract and skin permeability of chemicals in consumer products using artificial membrane permeability assay

Juyoung Park(박주영),Handule Lee(이한들),Kwangsik Park(박광식) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5

Some chemicals commonly used in personal care products, household items, food vessels, cosmetics, and other consumer products are potentially harmful, and several reviews of epidemiological studies have suggested the associations between the chemical exposure from consumer products, and respiratory diseases, skin sensitization, and reproductive problems. Therefore, risk assessment is essential for management of consumer products safety. Necessarily, the estimation of human exposure is an essential step in risk assessment, and the absorption rate of those chemicals via the gastrointestinal tract, respiratory tract, and skin are very critical in determining the internal dose of the exposed chemicals. In this study, parallel artificial membrane permeability assays (PAMPA) for the gastrointestinal tract and skin were performed to evaluate the permeability of parabens, bisphenols, isothiazolinones, and phthalates. Lipid solubility of test chemicals indicated by log P values was shown as the most critical factor and showed a positive association with the permeability of parabens, bisphenols, and isothiazolinones in PAMPA assay. However, phthalates showed a reverse-association between lipophilicity and permeability. The permeability of all the tested chemicals was higher in the gastrointestinal tract membrane than in the skin membrane. The pH in donor solution did not show significant effects on the permeability in all the chemicals, except the chemicals with a free hydrophilic moiety in their chemical structures.

Mixture Toxicity of Methylisothiazolinone and Propylene Glycol at a Maximum Concentration for Personal Care Products

Juyoung Park,Handule Lee,Kwangsik Park 한국독성학회 2018 Toxicological Research Vol.34 No.4

Methylisothiazolinone (MIT) has been used in combination with methylchloroisothiazolinone (CMIT) for cosmetic products such as shampoo, body lotion, and skin care products. The mixture of CMIT/MIT has been found to cause allergic contact dermatitis and is thus no longer permitted for use as a preservative in leave-on cosmetics. However, MIT itself was approved as a stand-alone preservative at a maximum concentration of 100 ppm as the toxicity was derived from CMIT rather than MIT. However, in many countries, allergic skin irritation caused by MIT remains a social concern. In this study, skin irritation was assessed for the presence of MIT, propylene glycol, and their mixture using a 3D human skin model EpiDermTM. Although non-diluted MIT causes serious skin toxicity, skin irritation was not observed at a concentration of 100 ppm, the maximum permissible level for cosmetics and personal care products according to European regulations. Propylene glycol, the most widely used vehicle for MIT, did not cause skin irritation in the 3D skin model. The results are expected to provide information for regulatory policies and guidelines on the use of biocides in consumer products.

Intelligent Classification of Heartbeats for Automated Real-Time ECG Monitoring

Park, Juyoung,Kang, Kyungtae Mary Ann Liebert 2014 TELEMEDICINE JOURNAL AND E HEALTH Vol.20 No.12

<P>Background: The automatic interpretation of electrocardiography (ECG) data can provide continuous analysis of heart activity, allowing the effective use of wireless devices such as the Holter monitor. Materials and Methods: We propose an intelligent heartbeat monitoring system to detect the possibility of arrhythmia in real time. We detected heartbeats and extracted features such as the QRS complex and P wave from ECG signals using the Pan-Tompkins algorithm, and the heartbeats were then classified into 16 types using a decision tree. Results: We tested the sensitivity, specificity, and accuracy of our system against data from the MIT-BIH Arrhythmia Database. Our system achieved an average accuracy of 97% in heartbeat detection and an average heartbeat classification accuracy of above 96%, which is comparable with the best competing schemes. Conclusions: This work provides a guide to the systematic design of an intelligent classification system for decision support in Holter ECG monitoring.</P>

A Block-Based Graph Model for Effective Wrapper Maintenance

Juyoung park,Joongmin Choi 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7

The wrapper is a special program which can automatically extract the information from the web pages which has a structured form. Most of the web pages are changed frequently and grow constantly. The structure of the web page is also changed frequently. The wrapper which is created before may not extract the information accurately from the changed web pages. In case that the structure of a web page is changed, even though wrapping operations are performed on the same information, the wrapper may not extract information practically. To solve this problem, we propose the novel method that segments a web page into visual block units and compose them as graph model. As a result, the graph model would be efficient wrapper management. The existing wrapper can extract the target information through the comparison of the graph model with the new one even if the structure of web page is changed.

HeartSearcher: finds patients with similar arrhythmias based on heartbeat classification

Juyoung Park,Kyungtae Kang IET 2015 IET systems biology Vol.9 No.6

<P>Long-term electrocardiogram data can be acquired by linking a Holter monitor to a mobile phone. However, most systems of this variety are simply designed to detect arrhythmia through heartbeat classification, and do not provide any additional support for clinical decisions. HeartSearcher identifies patients with similar arrhythmias from heartbeat classifications, by summarising each patient's typical heartbeat pattern in the form of a regular expression, and then ranking patients according to the similarities of their patterns. Results obtained using electrocardiogram data from the MIT-BIH arrhythmia database show that this abstraction reduces the volume of heartbeat classifications by 98% on average, offering great potential to support clinical decisions.</P>

Predictable and Reliable ECG Monitoring over IEEE 802.11 WLANs Within a Hospital

Park, Juyoung,Kang, Kyungtae Mary Ann Liebert 2014 TELEMEDICINE JOURNAL AND E HEALTH Vol.20 No.9

<P>Telecardiology provides mobility for patients who require constant electrocardiogram (ECG) monitoring. However, its safety is dependent on the predictability and robustness of data delivery, which must overcome errors in the wireless channel through which the ECG data are transmitted. We report here a framework that can be used to gauge the applicability of IEEE 802.11 wireless local area network (WLAN) technology to ECG monitoring systems in terms of delay constraints and transmission reliability. For this purpose, a medical-grade WLAN architecture achieved predictable delay through the combination of a medium access control mechanism based on the point coordination function provided by IEEE 802.11 and an error control scheme based on Reed-Solomon coding and block interleaving. The size of the jitter buffer needed was determined by this architecture to avoid service dropout caused by buffer underrun, through analysis of variations in transmission delay. Finally, we assessed this architecture in terms of service latency and reliability by modeling the transmission of uncompressed two-lead electrocardiogram data from the MIT-BIH Arrhythmia Database and highlight the applicability of this wireless technology to telecardiology.</P>