경기도내 어린이공원의 토양오염실태 연구

김웅수(Woongsoo Kim),송일석(Ilseok Song),신종현(Jonghyun Shin),오천환(Cheonhwan Oh),김은아(Eunah Kim),김극태(Keugtae Kim),김현자(Hyunja Kim),김종수(Kim, Jongsu Kim),최윤호(Yunho Choi) 한국환경보건학회 2017 한국환경보건학회지 Vol.43 No.3

Objectives: The pollution status of heavy metals within the soil was investigated with an aim to establishing a sustainable soil environment within parks and amusement facilities installed in urban areas of Gyeonggi–do Province. Methods: As sampling sites, 14 locations were selected from a city with a number of factories near a residential area, a residential area, and a children s park in a city with mixed green areas. Seven kinds of heavy metals, including Cd, Pb, and Hg, and the pH of soil were analyzed three times by inductively coupled plasma optical emission spectroscopy (ICP-OES) and atomic absorption spectrometer (AAS). Results: In this study, the pH of the samples from the residential park and industrial park showed 5.7-6.5 and 5.9-7.0, respectively. The overall mean concentration (mg/kg) of heavy metals was Zn (132.8), Ni (73.0), Cu (47.4), Pb (35.9), As (4.84), Cd (0.39), and Hg (0.07), indicating that these concentrations of heavy metals were lower than those for the area 1 standard of soil pollution concern criteria. In addition, the sampling sites in the residential area and the industrial area also showed the same tendency for concentration distribution. Conclusions: We found that the soil pollution class (SPC) of some spots were over 200, which are third and fourth classes. In order to manage a sustainable soil environment in a city park, it is suggested that local governments, the management bodies for these parks, need to manage, supervise, and investigate soil pollution and quickly replace contaminated soil.

Development and application of chip calorimeter as an X-ray detector

Jonghyun Kim,Sung Min Nam,Heejun Jang,Jae-Pil Chung,Jin Sung Kim,Byoung-Chul Kim,Kook Jin Chun,Wonhee Lee 한국물리학회 2020 Current Applied Physics Vol.20 No.2

Radiotherapy for cancer patients requires accurate measurement of the absorbed dose of radiation in a treatment planning step. Various types of radiation detectors are currently utilized for dose measurement. Among them, calorimeters are known to be the most precise detector for measuring absorbed dose, but their on-site application is limited by the large size of the equipment. We developed a miniaturized chip calorimeter for application as a radiation detector. The calorimetric radiation detector was built using micro/nano fabrication techniques, and consists of an SU-8 photoresist absorber and high-sensitivity vanadium oxide (VOx) thermistors. The thermistors had a temperature resolution of 135 μK, and the calorimeter showed a thermal conductance of 11 μW/K. The detector was irradiated with various X-ray dose rates from a linear accelerator, and the absorbed dose to SU-8 was measured. The detector responses showed high linearity with dose rates, demonstrating the feasibility of the radiation detector for practical uses.

Glass Interposer Electromagnetic Bandgap Structure for Efficient Suppression of Power/Ground Noise Coupling

Kim, Youngwoo,Cho, Jonghyun,Kim, Jonghoon J.,Cho, Kyungjun,Kim, Subin,Sitaraman, Srikrishna,Sundaram, Venky,Raj, Pulugurtha Markondeya,Tummala, Rao R.,Kim, Joungho [Institute of Electrical and Electronics Engineers 2017 IEEE transactions on electromagnetic compatibility Vol.59 No.3

<P>In this paper, we propose glass interposer electromagnetic bandgap (EBG) structure to efficiently suppress power/ground noise coupling. We designed, fabricated, measured, and analyzed a glass interposer EBG structure for the first time. Glass interposer EBG structure test vehicles were fabricated using a thin-glass substrate, low-loss polymer layers, and periodic metal patches with through glass vias (TGVs) in glass interposer power distribution network. Using the dispersion characteristics, we thoroughly analyzed and derived f(L) and f(U) of the glass interposer EBG structure. We experimentally verified that the proposed glass interposer EBG structure achieved power/ground noise suppression (below -40 dB) between f(L) of 5.8 GHz and f(U) of 9.6 GHz. Derived f(L) and f(U) based on dispersion analysis, full three-dimensional electromagnetic (3-D-EM) simulation and measurement achieved good correlation. In the glass interposer EBG structure, tapered structure of the TGV and thickness of the low-loss polymer used for metal-layers lamination affected the noise suppression bandgap significantly. The effectiveness of the proposed glass interposer EBG structure on suppression of the power/ground noise propagation and coupling to high-speed TGV channel was verified with 3-D-EM simulation. As a result, the proposed glass interposer EBG structure successfully and efficiently suppressed the power/ground noise propagation and improved eye-diagram of the high-speed TGV channel.</P>

Literature Survey of Natural Environment and Human Society in Korea for Application to the HLW (SNF) Disposal Sites Biosphere Assessment

Jonghyun Kim,Dongki Kim,Wontak Lee,Yisu Kim 한국방사성폐기물학회 2023 한국방사성폐기물학회 학술논문요약집 Vol.21 No.1

IAEA safety standards document and international programs (such as BIOMASS) related to the assessment of the biosphere around High Level Radioactive Waste (including Spent Nuclear Fuel) repositories require the assessment of the biosphere to use the assumption that the current natural environment and human society will be maintained, and at the same time, the evolution of the distant future changes also need to be taken into account. In Korea, which has not designated candidate disposal sites, it is necessary to investigate and predict the current state and future changes of the natural environment throughout Korea and apply it practically to Biosphere assessment (for BDCF derivation) for candidate disposal sites suitability assessment and Safety Case (for performance assessment) preparation for design, construction, operation, and post-closure management. To this end, the natural environment in the fields of Topography, Geology, Soil, Ecology, Weather and Climate, Animals and Plants, Hydrology, Ocean, Land-use, etc. and human society in the fields of Population Distribution, Spatial-Planning, Urban Form, Industrial-Structure, Lifestyle etc. are being investigated in the context of current status, past change records, and future change potential in the Korean Peninsula. This paper summarizes those investigations to date. This study referred Biomass-6 [IAEA] and National Atlas I (2019)/II (2020)/III (2021) [National Geographic Information Institute of the Korea Ministry of Land, Infrastructure and Transport].

Ultrareliable and Low-Latency Communication Techniques for Tactile Internet Services

Kim, Kwang Soon,Kim, Dong Ku,Chae, Chan-Byoung,Choi, Sunghyun,Ko, Young-Chai,Kim, Jonghyun,Lim, Yeon-Geun,Yang, Minho,Kim, Sundo,Lim, Byungju,Lee, Kwanghoon,Ryu, Kyung Lin IEEE 2019 Proceedings of the Institute of Electrical and Ele Vol.107 No.2

<P>This paper presents novel ultrareliable and low-latency communication (URLLC) techniques for URLLC services, such as Tactile Internet services. Among typical use cases of URLLC services are teleoperation, immersive virtual reality, cooperative automated driving, and so on. In such URLLC services, new kinds of traffic such as haptic information including kinesthetic information and tactile information need to be delivered in addition to high-quality video and audio traffic in traditional multimedia services. Furthermore, such a variety of traffic has various characteristics in terms of packet sizes and data rates with a variety of requirements of latency and reliability. Furthermore, some traffic may occur in a sporadic manner but requires reliable delivery of packets of medium to large sizes within a low latency, which is not supported by current state-of-the-art wireless communication systems and is very challenging for future wireless communication systems. Thus, to meet such a variety of tight traffic requirements in a wireless communication system, novel technologies from the physical layer to the network layer need to be devised. In this paper, some novel physical layer technologies such as waveform multiplexing, multiple-access scheme, channel code design, synchronization, and full-duplex transmission for spectrally efficient URLLC are introduced. In addition, a novel performance evaluation approach, which combines a ray-tracing tool and system-level simulation, is suggested for evaluating the performance of the proposed schemes. Simulation results show the feasibility of the proposed schemes providing realistic URLLC services in realistic geographical environments, which encourages further efforts to substantiate the proposed work.</P>

Through-Silicon Via Capacitance–Voltage Hysteresis Modeling for 2.5-D and 3-D IC

Kim, Dong-Hyun,Kim, Youngwoo,Cho, Jonghyun,Bae, Bumhee,Park, Junyong,Lee, Hyunsuk,Lim, Jaemin,Kim, Jonghoon J.,Piersanti, Stefano,de Paulis, Francesco,Orlandi, Antonio,Kim, Joungho IEEE 2017 IEEE transactions on components, packaging, and ma Vol.7 No.6

<P>We propose, for the first time, an explicit semiconductor physics-based through-silicon via (TSV) capacitance-voltage (CV) model. The effect of TSV CV hysteresis is demonstrated in the model, and the TSV capacitance is modeled with respect to dc bias voltage and the dimension of the TSV. The proposed model is verified by comparison to the measurement results. The effect of hysteresis in the model correlates well with the measurement results. This model can be utilized in a circuit level simulation to expand the possible application of the model to, but not limited to, hierarchical power distribution network impedance analysis, RC delay analysis, input-output power consumption analysis, and crosstalk and eye diagram simulation in any 3-D-IC systems using TSVs.</P>

Metabolic Differentiation of Diamondback Moth (Plutella xylostella (L.)) Resistance in Cabbage (Brassica oleracea L. ssp. <i>capitata</i>)

Kim, Jae Kwang,Choi, Su Ryun,Lee, Jeongyeo,Park, Soo-Yun,Song, Seung Yeub,Na, Jonghyun,Kim, Suk Weon,Kim, Sun-Ju,Nou, Ill-Sup,Lee, Yong Han,Park, Sang Un,Kim, HyeRan American Chemical Society 2013 Journal of agricultural and food chemistry Vol.61 No.46

<P>The diamondback moth, Plutella xylostella (L.), is a major pest responsible for destroying cabbage and other Brassica vegetable crops. A diamondback moth-resistant cabbage line was studied by comparing its metabolite profiles with those of a susceptible cabbage. Fourier transform infrared spectroscopy analysis revealed that carbohydrates, aromatic compounds, and amides were the major factors that distinguished the resistant and susceptible genotypes. Gas chromatography–time-of-flight mass spectrometry profiled 46 metabolites, including 19 amino acids, 15 organic acids, 8 sugars, 3 sugar alcohols, and 1 amine in two genotypes and F<SUB>1</SUB> hybrid cabbages. The levels of glycolic acid, quinic acid, inositol, fumaric acid, glyceric acid, trehalose, shikimic acid, and aspartic acid were found to be very significantly different between the resistant and susceptible genotypes with a <I>P</I> value of <0.0001. These results will provide a foundation for further studies on diamondback moth resistance in cabbage breeding and for the development of other herbivore-resistant crops.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jafcau/2013/jafcau.2013.61.issue-46/jf403441t/production/images/medium/jf-2013-03441t_0006.gif'></P>

F-number matching method in light field microscopy using an elastic micro lens array

Kim, Jonghyun,Jeong, Youngmo,Kim, Hyungjin,Lee, Chang-Kun,Lee, Byeongmoon,Hong, Jisoo,Kim, Youngmin,Hong, Yongtaek,Lee, Sin-Doo,Lee, Byoungho OPTICAL SOCIETY OF AMERICA 2016 Optics letters Vol.41 No.12

<P>In light field microscopy (LFM), the F-number of the micro lens array (MLA) should be matched with the image-side F-number of the objective lens to utilize full resolution of an image sensor. We propose a new F-number matching method that can be applied to multiple objective lenses by using an elastic MLA. We fabricate an elastic MLA with polydimethylsiloxane (PDMS) using a micro contact printing method and address the strain for the F-number variation. The strain response is analyzed, and the LFM system with the elastic MLA is demonstrated. Our proposed system can increase the F-number up to 27.3% and can be applied to multiple objective lenses. (C) 2016 Optical Society of America</P>

Development and Control of an Electric Oil Pump for Automatic Transmission-Based Hybrid Electric Vehicle

Yeonho Kim,Jaesang Lee,Chihoon Jo,Yongha Kim,Minseok Song,Jonghyun Kim,Hyunsoo Kim IEEE 2011 IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY Vol.60 No.5

<P>We developed an electric oil pump (EOP) and a control algorithm for automatic transmission (AT)-based two-shaft parallel hybrid electric vehicles (HEVs). The EOP capacity was designed based on AT oil pump test results, and the torque of the EOP motor was determined by considering the flow rate and efficiency calculated according to the operating temperature of the AT fluid. A control algorithm consisting of low, high, and middle speeds according to the HEV driving mode was proposed for the operation of the designed EOP. Control logic was proposed to reduce the EOP energy requirements in the middle-speed range, in which the EOP and AT oil pump operate together. We verified that this control method could reduce electric load while supplying the required hydraulic pressure.</P>

VANET 환경의 서비스 제공을 위한 순환 경로의 노드를 이용한 라우팅 기법

김종현(Jonghyun Kim),조미영(Miyoung Cho),유준범(Junbeom Yoo),김종완(Jongwan Kim),김기천(Keecheon Kim) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1D

VANET은 인명과 재산에 직결된 어플리케이션 제공으로 다양한 연구가 진행되고 있으며, 급격한 토폴로지 변화를 보이는 특징을 보인다. 위치 정보 기반 라우팅 기법인 그리디 포워딩 기법은 VANET의 적용에 있어서 경로에 대한 정보를 유지하지 않는 특성으로 비효율적인 경로 설정과 전달 실패를 가져올 수 있다. 따라서 본 논문에서는 VANET환경의 서비스 제공에 있어서 고정된 경로를 갖는 노드를 이용한 서비스를 등록 및 요청 기법을 제안한다. 고정된 순환 경로를 갖는 버스 노드는 주변 노드로부터 메시지를 수신하여 전체 노선에 대한 최적 경로를 다익스트라(Dijkstra) 알고리즘을 통하여 산출하여, 중간 경유 노드를 앵커 포인트(Anchor Point)로 설정하는 것으로 안정된 전송 경로를 보장한다. 또한 시시각각 변화하는 도로 환경을 반영하여, 데이터 전송률을 통한 전송 효율을 각 노선의 교차 지점에 대하여 갱신하여 최적 경로 설정에 반영한다. 성능 평가에서는 본 논문에서 제안된 앵커 포인트를 이용하여 개선된 기법과 GPSR 기반 서비스 제공 기법을 전송 시간에 대하여 성능을 비교하였다.