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임성현,박홍순,노승호,한상길,랑문정,윤여경 한국공업화학회 2003 공업화학 Vol.14 No.3
본 연구는 알킬 페놀류 8종(4-t-butyl phenol (BP), 4-n-pentyl phenol (PP), 4-n-hexyl phenol (HxP), 4-t-octyl phenol (t-OP), 4-n-heptyl phenol (HpP), b-nonyl phenol (b-NP). 4-n-octyl phenol (OP), 4-n-nonyl phenol (NP))을 액체 크로마토그래피(HPLC) 다이오드 배열 검출기(diode array detector, DAD)를 이용하여 동시분석하였다. 분리관은 역상 Cl8(250×4.6 mm), 이동상은 물과 메탄올을 사용하여 기울기 용리(gradient)하에서 알킬 페놀류의 알킬 길이에 따라 분리하였으며, 알킬 페놀류의 검량선을 도시한 결과 좋은 직선성이 보였다. 상기 분석법으로 국내 유통 중인 주방 세제류 내 알킬 패놀류를 분석한 결과 불검출 되었고, 이때 검출한계는 주입량(10 μL) 대비 1 pg이었다. 4-t-butyl phenol (BP), 4-n-pentyl phenol (PP), 4-n-hexyl phenol (HxP), 4-1-octyl phenol (t-OP), 4-n-heptyl phenol (HpP), b-nonyl phenol (b-NP), 4-n-octyl phenol (OP), and 4-n-nonyl phenol (NP) were simultaneously separated by a high performance liquid chromatography (HPLC) with UV diode array detector(230 nm, f60 nm, 280 nm) using an octadecylsilica column (Cl8, 250×4.6 mm) and water/methanol gradient solution. The calibration curves of alkyl phenols showed a good linear relationship, and the recoveries were over 95%. With the detection limit of 1pg for alkyl phenols with respect to the injected amount, alkyl phenols were not detected in tile dishwashing detergents that were available on the market.
임성현,정민근,정의승 한국경영과학회 2001 한국경영과학회 학술대회논문집 Vol.- No.1(1)
최근 디지털 휴먼 모델(Digital Human Model)개발 연구의 일환으로 동작 예측 모델 개발에 관한 연구가 비교적 활발히 진행되어지고 있으나, 앉은 자세에서의 동작 예측 모델의 기준점(Reference Point )은 각 연구마다 서로 다르게 선정하고 있다. 이에 따라 본 연구에서는 기존의 앉은 자세 동작 예측 모델에서 모델 기준점으로 많이 사용되고 있는 Hip Joint, ASIS(Anterior Superior Iliac Spine), L5/S1에 대하여 다양한 동작 수행 시 움직이는 정도를 실험을 통해 측정 분석하였다. 연구 결과 세 기준점 중 Hip Joint의 움직임이 가장 적은 것으로 나타났으며, 특히 팔길이보다 더 먼 Target에 대한 동작을 포함하는 앉은 자세 동작 예측 모델의 경우 Hip Joint를 모델의 기준점으로 하는 것이 가장 합리적인 것으로 나타났다.
REAL-TIME CONTROL ALGORITHM FOR HYBRID SYSTEM USING GEAR SHIFT MAP AND MODE CONVERSION MAP
임성현,김진성,박영일 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.1
In this paper, we propose a new control logic for hybrid vehicle control technology using predictable real road information. The newly proposed control logic is implemented in real time by applying the shifting map of the engine and transmission applied to the hybrid vehicle and the mode conversion map extracted from various driving modes. The proposed control logic has the advantage of minimizing the loss compared to the theoretical maximum fuel consumption implemented in the backward simulation and achieving more stable shifting and mode conversion. As a result of applying the proposed control algorithm to the omnidirectional simulation, the result showed better fuel efficiency improvement than the existing rule base control method. The newly proposed control algorithm can be used as a hybrid control algorithm that can solve the computation time problems required for the optimization process through the conventional reverse simulation and can perform stable shift and mode conversion in real time.
니켈을 입힌 실리콘 전계방출 바늘과 단일 및 이중게이트 실리콘 전계방출 소자연구
임성현 선문대학교 대학원 1998 논문집 Vol.2 No.-
Recently, flat panel display based upon field emission arrays is being intensively studied because it has potentially a number of remarkable advantages over the other flat panel displays. In this research, the volcano-shaped field emission arrays (FEA) have been fabricated using highly doped n-type si substrate. The silicon tips have been formed using reactive ion etching and sharpening oxidation process was followed. The gate oxide insulating layer of the gate structure has been deposited by plasma enhanced chemical vapor deposition (PECVD) and the gate metal layer was formed by sputter. The gate matel film was removed using self-aligned etching technique and the oxide layer was etched out to fabricate the gate hole. The current-voltage characteristics from 90,000 tips were measured in high vacuum chamber. The total current from the 90,000 cathodes was 10 nA at the anode bias of 2,000 V. In the second part of the thesis, we will show the fabrication and the results of current-voltage measurements of the si field emitters coated with Ni thin film by thermal evaporation. The Ni-coated Si tips are known to be able to tolerate self-heating and ion bombarding damage, which improving the field emission characteristics. We have observed that, the onset voltage and stability were much improved by coating the silicon tips with nickel. The emission current from the 90000 cathodes was 372μm at the gate bias of 69 V while the anode bias voltage of 300 V is fixed during the whole measurement process.
임성현,오원옥 한국아동간호학회 2018 Child Health Nursing Research Vol.24 No.1
Purpose: The purpose of this study was to develop parent coaching domains for the health management of childhood leukemia survivors. Methods: In this study, we conducted a literature review and in-depth interviews with 6 parents of childhood leukemia survivors who were identified using convenience sampling. We identified areas of parent coaching through the 4 stages of the GROW model, which are: goal setting, realistic grasp, confirmation of realization, and search for alternatives. Results: Nine domains and 27 subcategories emerged from the study. The 9 parent coaching domains for the health management of childhood leukemia survivors were routine life management, education and information provision, emotional support for the surviving children, social support for the surviving children, follow-up management, family support, school life management, symptom management, and improvement of growth and development. Conclusion: This research developed 9 parent coaching domains for the health management of children surviving leukemia. The results of this study are expected to contribute to the efficient health management of childhood leukemia survivors by enabling practitioners to continuously identify new coaching domains as needed for their health management. Researchers should improve the health management of childhood leukemia survivors by developing nursing interventions for these new coaching areas.