Wireless pressure sensor integrated with a 3D printed polymer stent for smart health monitoring

Park, Jongsung,Kim, Ji-Kwan,Kim, Dong-Su,Shanmugasundaram, Arunkumar,Park, Su A,Kang, Sohi,Kim, Sung-Ho,Jeong, Myung Ho,Lee, Dong-Weon Elsevier 2019 Sensors and actuators. B Chemical Vol.280 No.-

<P><B>Abstract</B></P> <P>The primary objective of this study was to deploy a promising wireless pressure sensor system capable of monitoring real-time biological signals in an experimental object. MEMS-based micromachining technology was used to fabricate the proposed SU-8 wireless pressure sensor. The sensor utilizes a capacitor-inductor resonant circuit that can operate the sensor without any external power supply. The variable capacitor in the pressure sensor is designed to change the resonance frequency (130, 183 MHz) in response to applied pressure. The fabricated wireless pressure sensor was integrated into a polymer-based smart stent to minimize the discomfort of medication administration and hospital visits. A 3D bio-printing-based manufacturing technique was employed for the production of a smart polymer stent with complicated shapes. The proposed method is considerably more comfortable than the conventional metal stents fabrication process. The polymer smart stent made of the biocompatible polycaprolactone (PCL) material which can be fully absorbed by the body after a medication period. After integrating the fabricated wireless pressure sensor with the polymer smart stent, various basic experiments such as the working distance of the sensor were performed using a simple experimental setup. The biocompatibility of the proposed polymer stent and the wireless pressure sensor was also successfully confirmed using an experimental animal. The preliminary investigation results indicate that the proposed wireless sensor can be used to obtain necessary information in various parts of the human body as well as the stent.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fabrication of SU-8 based wireless pressure sensor for battery-less operation. </LI> <LI> Manufacturing of biodegradable polymer stent using 3D printing technique. </LI> <LI> Integration of wireless pressure sensor into polymer stent for real-time blood pressure monitoring. </LI> <LI> Verification of the biocompatibility of smart stent and its operation with experimental animals. </LI> <LI> Continuous measurement of blood pressure change in animals for more than 3 months. </LI> </UL> </P>

버스정보시스템(BIS)을 위한 모바일 환경의 시각화 기법 연구

박동규,박진화,이수진,박은호,류동성,어윤 국립7개대학공동논문집간행위원회 2004 공업기술연구 Vol.4 No.-

In this paper we describe a visualization method for Bus Information System(BIS) on Mobile Environment. A BIS is a key service for Intelligent Transport System(ITS) on public transportation area. We present a client-server based visualization technique for bus route information over Internet Protocol and user-oriented regional information service with a voice and animation. We also describe the design and implementation of this kind of schematic map generation system with icon and label.

Elevational Distribution of Breeding Bird Communities in Seoraksan National Park, Korea

( Hyun-su Hwang ),( Jae-kang Lee ),( Tae-kyung Eom ),( Ho-kyoung Bae ),( Dong-ho Lee ),( Jong-hwan Lim ),( Sung-cheol Jung ),( Chan-ryul Park ),( Shin-jae Rhim ) 한국산림과학회(구 한국임학회) 2020 한국산림과학회지 Vol.109 No.1

In this study, the elevational distribution of breeding birds in Seoraksan National Park, Korea was investigated. Forty-six species of birds were documented from line transect surveys taken from Seorakdong at 230 m above sea level (a.s.l.) to the Daechungbong summit at 1708 m asl. Birdspecies richness and diversity were highest in Seorakdong and lowest at the Daechungbong summit. As elevation increased, bird species richness and diversity decreased, with a humped-shape trend being observed between 700 m and 1200 m a.s.l. Stepwise analyses revealed that breeding bird species diversity indices were significantly negatively correlated with elevation (r² = 0.327, P < 0.001) and positively correlated with vegetational coverage (r² = 0.324, P = 0.046). Higher elevations supported fewer birds than low and intermediate elevations. Projections at the local scale, including data on behavior and habitat use by birds, will be necessary for optimal conservation and management of the bird communities in Seoraksan National Park.

산악형 국립공원의 구조활동 현황과 개선방안 -설악산 국립공원을 중심으로-

조태동 ( Tae Dong Jo ),김일수 ( Il Su Kim ),박진홍 ( Jin Hong Park ) 한국녹지환경디자인학회 2005 녹지환경학회지 Vol.1 No.1

This study examines current situation of rescue activities in mountainous national parks and suggests various measures to improve the pending problems, with a special focus on Soraksan National Park. Its method includes theoretical consideration, field survey and interviews with visitors. The results are as follows; We need; First, supplement of specialized rescue workers. Second, information and education against possible safety accidents for visitors. Third, region-specific education and improvement of working environment for 119 rescue workers. Forth, active rescue activities by establishing policies for private rescue units.

빌라조경 설계사례에 관한 연구 : Case Study of Jang-chung Dong Villa

김동찬,이윤수,유재설,박익수,임동민,임상재 경희대학교 부설 디자인연구원 1998 예술· 디자인학연구 Vol.1 No.1

The goal of this study is to propose a plan for the Jang-Chung Dong Villa. This Villa is located on Jang-Chung Dong Jung-Gu, Seoul. And, this place is where high-class residential area. This Site area covers about 1925.6m². This base idea of this plan is to provide a community of dwelling houses with identity and amenity in outdoor spaces in order to create the high-class environment of outdoor spaces. Design principles are established as follow; to make spaces for flexibility in the garden related activities, to provide many chances to contact with nature, and to feel pride in the villa life.

Elevational Distribution of Breeding Bird Communities in Seoraksan National Park, Korea

Hwang, Hyun-Su,Lee, Jae-Kang,Eom, Tae-Kyung,Bae, Ho-Kyoung,Lee, Dong-Ho,Lim, Jong-Hwan,Jung, Sung-Cheol,Park, Chan-Ryul,Rhim, Shin-Jae Korean Society of Forest Science 2020 한국산림과학회지 Vol.109 No.1

In this study, the elevational distribution of breeding birds in Seoraksan National Park, Korea was investigated. Forty-six species of birds were documented from line transect surveys taken from Seorakdong at 230 m above sea level (a.s.l.) to the Daechungbong summit at 1708 m asl. Birdspecies richness and diversity were highest in Seorakdong and lowest at the Daechungbong summit. As elevation increased, bird species richness and diversity decreased, with a humped-shape trend being observed between 700 m and 1200 m a.s.l. Stepwise analyses revealed that breeding bird species diversity indices were significantly negatively correlated with elevation (r² = 0.327, P < 0.001) and positively correlated with vegetational coverage (r² = 0.324, P = 0.046). Higher elevations supported fewer birds than low and intermediate elevations. Projections at the local scale, including data on behavior and habitat use by birds, will be necessary for optimal conservation and management of the bird communities in Seoraksan National Park.

한국인 직무 스트레스 측정도구의 개발 및 표준화

장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4

Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.

국립공원 관리를 위한 해양생태계 장기 모니터링 프로그램의 발전 방향

이채린(Chae-Lin Lee),유재원(Jae-Won Yoo),정병관(Byungkwan Jeoung),김창수(Chang-Soo Kim),안동식(Dong-Sik Ahn),김성태(Sungtae Kim),성은주(Eun-Ju Sung),김성현(Sung-Hyun Kim),정수영(Su-Yeoung Jeong),박영석(Young-Seuk Park) 국립공원연구원 2021 국립공원연구지 Vol.12 No.2

생태계 변화의 모니터링은 효율적 생태계 관리를 위한 기초 정보 수집을 위해 중요한 과정이다. 많은 생태 현상과 그 과정은 오랜 시간에 걸쳐 진행되므로 국립공원의 지속적인 보전 및 효율적 관리를 위해 생태계 모니터링은 장기적으로 이루어질 필요가 있다. 본 연구는 국내외 장기 모니터링 프로그램 사례 분석을 통해 성공적인 장기 모니터링을 위한 방법으로써, 최적화된 모니터링 설계, 표준화된 운용방안 마련, 인적 자원 및 DATA 관리 체계 수립, 안정적인 재정 마련 및 후속지원 등을 제시하였다. 이를 바탕으로, 현재 10년 넘게 수행되고 있는 ‘HS호 유류유출 사고 해역 장기 모니터링 프로그램’의 발전 방향으로 적응형 모니터링 방식이 적용된 표준화된 프로토콜의 정립, QA/QC와 지속적인 자료 관리, 조사 항목의 연계성 강화 등의 구체적 방안을 제안한다. Monitoring ecosystem changes is an important process for collecting basic information for ecosystem management. Since many ecological phenomena and their processes take place over a long period of time, it is necessary to conduct long-term monitoring of ecosystems for the continuous conservation and efficient management of national parks. This study suggested an optimized monitoring design, standardized operation plan, human resource and data management system, stable financial preparation and follow-up support as methods for successful long-term monitoring through case analysis of domestic and foreign long-term monitoring programs. Based on this, it proposes specific measures such as establishing a standardized protocol with adaptive monitoring methods, continuous data management with QA/QC, and strengthening the linkage of investigation items in the development direction of the “HS oil spill accident long-term monitoring program” that has been conducted for more than a decade.

수중의 전기장이 폐수처리 효율에 미치는 영향 : -혐기성반응을 중심으로- -Focused mainly on anacerobic process-

박수용,김동민 서울市立大學校 1989 論文集 Vol.23 No.-

Electric Potential Effects to the Efficiency of Piological Wastewater Treatment-Focused Mainly on Anaerohic Proclss. An experimental study was conducted to conform an hypothesis that the introduction of direct electric current into mixed liquor in anaerobic reactor might stimulate the metabolic activity of anaerobic bacterial cells. Complete-mix type anaerobic reactors with effective volume of 3.5L were used in this experimental study and were operated by semi-continuous mode. In the 1st stage experiment, direct current with 10 and 5volt were applied intermittently for 30 seconds in every 30 minutes. In the 2nd stage experiment, D.C.electric field applied was 5 volt and also intermitent for 30 seconds in every 5 minutes and in every 30 minutes Control reactor was run in the same operational condition to separate the effect of electrical stress from other environmental factors. Synthetic wastewater was used as feed for both of the control and the test reactors. As a result of this experimental study electrical stress applied intermitently in anaerobic reactor was proved to be effective in that substrate removal rate was increased by 30% or more, and anabolic activity of bacterial cell was increased.

정신분열병과 Neuregulin 1 유전자의 연합연구

박동연,이유상,조은영,조승희,장용이,전현옥,장수연,윤세창,김종원,홍경수 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.3

Objectives : The authors recently found a suggestive evidence of linkage of chromosome 8p21-12 to schizophrenia in Korean multiplex families. Neuregutin 1 (NRGI) was identified in this locus as a positional and functional candidate gene for Schizo-phrenia, through several independent studies with European and Chinese populations. The purpose of this study is to determine whether NRGl is associated with schizophrenia in Korean population. Methods : Three SNPs (SNP8NRG221533, SNP8NRG241930, SNP8NRG243177) and two microsatellites markers (478B14-848,420M9-1395) located at the 5' end of NRGI were genotyped for 242 unrelated schizophrenia patients and the same num-ber of normal controls. Genetic association was tested by χ²-test (df=1). Not only for the whole patients group but also for asubgroup of patients with auditory hallucination. This subtype showed stronger linkage with chromosome 8p12 in the prior study of the authors with multiplex families. Results : G allele of SNP8NRG241930 was significantly in excess in the subgroup of patients with auditory hallucination compared to the control group (p=0.03, 0R=1.76). We also found that 3 SNPs haplotype TTC (p=0.04, 0R=0.58) and five markers haplotype TTC53 (p=0.01,0R=0.49) were associated with schziophrenia with a protective effect. Three SNPs haplotype CGT which is a part of the at-risk haplotype of the Icelandic schizophrenia families was found in excess in the patients group but no significant association was observed. Conclusion : NRGI might either play a mle in the predisposition to schizophrenia or be in linkage disequilibrium with a causal locus of this illness.