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카노 모델을 이용한 고창 자연마당의 서비스 품질 속성 분류
홍진표 ( Hong¸ Jin-pyo ),심윤진 ( Shim¸ Yun-jin ),강필구 ( Kang¸ Pil-goo ),최영자 ( Choi¸ Young-ja ),어양준 ( Eo¸ Yang-jun ),서경원 ( Seo¸ Kyung-won ) 한국환경복원기술학회 2021 한국환경복원기술학회지 Vol.24 No.4
This study was conducted to classify quality attributes for quality elements of public service targeting Gochang Jayeonmadang and analyze their impact on resident satisfaction and dissatisfaction by each service quality element by using the Kano model and the customer satisfaction coefficient and dissatisfaction coefficient of Timko(1993). As a result of the study, all 20 quality elements of public service were classified as one-dimensional attributes. Since the Jayeonmadang project restores the damaged natural environment and restores the ecosystem, it is judged that satisfaction is proportionately satisfied as the natural environment has been restored and the ecosystem has been restored. According to Timko (1993)’s analysis of customer satisfaction coefficient, it is believed that the most effective way to improve residents’ satisfaction is to carefully establish and implement maintenance plans and to create a good environment to ensure that plants have settled.
Acoustically excited oscillating bubble on a flexible structure and its energy-harvesting capability
Jinpyo Jeon,홍지우,Sang Joon Lee,Sang Kug Chung 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
When a bubble oscillates under the action of an acoustic field, it generates a cavitational microstreaming flow around it. We here explore oscillation dynamics of a bubble hanging on a flexible structure (i.e., piezocantilever) by acoustic excitation, and assess the suitability of the proposed method to micro-energy harvesting systems. We preferentially investigate the characteristics of bubble oscillation, such as the maximum amplitude and resonant frequency by varying the applied frequency and bubble size. The amplitude of the oscillating bubble is found to be maximized at the resonant frequency depending on the bubble size. Additionally, we measured the electrical outcome generated from bubble oscillation-induced microstreaming and resultant vibration of the piezocantilever, as functions of the applied frequency, bubble size, and distance between the bubble and piezoactuator. The generated voltage is considerably dependent of the applied frequency and bubble size. Meanwhile, it is inversely proportional to the distance between the bubble and piezoactuator. Finally, we found that the electrical output can be can be improved by increasing the number of bubbles. This work will provide a new framework for the fundamental design of bubble-mediated micro-energy harvesters and microsensors.
Jinpyo Hong,티루세 테카파우 멍에샤,홍석원,Hyung-Kook Kim,황윤회 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.3
We have synthesized binary reduced-graphene-oxide (RGO)/metal-oxide (Ni(OH)2, NiO, MnO2, and Fe3O4) nanocomposites by using a facile hydrothermal process. The morphology and the structure of the composite are confirmed by using x-ray diffraction (XRD), high-resolution transmission electron microscope (HRTEM), field-emission scanning electron microscopy (FESEM) and Raman spectroscopy. The electric capacitances that have been achieved for the nanocomposites at a current density of 1 A/g are 55, 140, 150 and 183 F/g for RGO/Fe3O4, RGO/Ni(OH)2, RGO/NiO and RGO/MnO2, respectively. Among them, RGO/MnO2 having the best electric capacity was used for preparing a current collector electrode by using various methods to attach the RGO/MnO2 nanocomposite to nickel foams. The supercapacitor performances of differently prepared current collector electrodes were tested, and the electric capacities found with the nanocomposites having a current density of 1 A/g are 28, 53, 112 and 212 F/g when the two-step drop method, the hydrothermal method, the doctor-blade method and the nanocomposite-drop method were used, respectively. Compared to a single metal-oxide, RGO/MnO2 nanocomposites show a superior electric conductivity, an electric capacity and a charge/discharge efficiency for supercapacitor performance, indicating that the RGO/metal-oxide nanocomposite is a promising material for supercapacitor applications.
Epidemiology of Suicide in Korea
JinPyo Hong,MyengJi Bae,Tongwoo Suh 대한신경정신의학회 2006 PSYCHIATRY INVESTIGATION Vol.3 No.2
In 2002, an estimated 877,000 lives were lost worldwide through suicide. In Korea, suicidal deaths have increased very rapidly since the economic crisis in 1997, and suicide is regarded as one of the most serious public health and social issues in Korea. This study examines the current situation and trends of the recently increasing rates of suicidal deaths, ideas, and attempts in Korea. This study reanalyzed the 20-year statistics of suicidal deaths recently published by the National Statistical Office and the data of the National Health Interview Survey conducted in 1995 and 1998. The suicidal mortality rate in Korea is quite high compared to those in other OECD countries and the rate of increase is the highest. The rate of suicidal idea is high among males, those in their late teens and those in their seventies. The suicidal attempt rate is higher among females and those in their late teens. Suicide, one of the important causes of death in the younger age group, has a greater socioeconomic impact than other common causes of death in the older age group. Therefore, we are in urgent need of a public mental health network to prevent suicide and to detect and treat early mental health problems leading to suicide.
USN 미들웨어 기반의 u-Healthcare 모니터링 시스템 구현 및 성능평가
이진표(Jinpyo Lee),김의창(Yeichang Kim) 한국인터넷전자상거래학회 2010 인터넷전자상거래연구 Vol.10 No.3
This paper shows the implementation of USN middleware for applying data obtained from heterogeneous sensor nodes to u-Healthcare system. Actually, USN middleware allows abstraction of heterogeneous sensor node, data filtering, event processing and Context-Awareness. USN middleware presented in this paper can maximize the extensibility and the usability of the system. It proceeds like this : 1) obtaining data through environment & bio sensor in sensor network of various environments, 2) transmitting the obtained data to middleware through gateway, 3) transforming the data into the standard format by abstraction, 4) and storing the data in DB of server. Eventually, the data stored in server can be monitored in real time by the user. In this paper, we estimated the usability of u-Healthcare monitoring system through analysing its efficiency. We also tried to improve the efficiency of the system by minimizing the system overhead and response time, analyzed the Memory Usage, CPU Usage, Threads and Classes Usage.
Lee, Jinpyo,Liu, Yanan,Liu, Yang,Park, Soo-Jin,Park, Mira,Kim, Hak Yong The Royal Society of Chemistry 2017 Journal of Materials Chemistry C Vol.5 No.31
<P>Highly conductive carbon-based fibrous materials have become one of the most sought-after components in electromagnetic interference (EMI) shielding due to their well-known properties. Herein, to fabricate exceptional shielding materials which possess desirable specific EMI shielding effectiveness (SSE) and absolute shielding effectiveness (SSEt), lightweight, flexible, pitch-based activated carbon fiber fabrics (ACFs) that bear high surface areas and fitting thicknesses were fabricated as a carbon framework. Moreover, a thin copper layer uniformly clad on the fiber surface, as a highly conductive functional part, was deposited<I>via</I>electroless plating. The EMI shielding performance was studied in both low and high frequency ranges of 30 MHz-1.5 GHz and 1.5-10 GHz, respectively. The fiber-stacked foam architecture provided the assembled fabrics with a high conductivity and multiple internal reflections during shielding that manifested exceptional SSE (up to 482.2 dB cm<SUP>3</SUP>g<SUP>−1</SUP>) and SSEt(11 162 dB cm<SUP>2</SUP>g<SUP>−1</SUP>) values, which were far better than those of the pure ACFs and void-free Cu foil. Moreover, the fabrics also showed excellent pitting resistance. The prepared shielding materials can be applied to many practical and commercial applications.</P>