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Soft artificial electroreceptors for non-contact spatial perception
W.J. Song(송원준),Y. Lee(이영훈),Y. Jung(정연수),Y.-W. Kang(강용우),J. Kim(김준형),J.-M. Park(박재만),Y.-L. Park(박용래),H.-Y. Kim(김호영),J.-Y. Sun(선정윤) 한국생산제조학회 2021 한국생산제조시스템학회 학술발표대회 논문집 Vol.2021 No.7
Elasmobranch fishes, such as sharks, skates and rays, use a network of electroreceptors distributed on their skin to locate adjacent prey. The receptors can detect the electric field generated by the biomechanical activity of the prey. By comparing the intensity of the electric fields sensed by each receptor in the network, the animals can perceive the relative positions of the prey without making physical contact. Inspired by this capacity for prey localization, we developed a soft artificial electroreceptor that can detect the relative positions of nearby objects in a non-contact manner by sensing the electric fields that originate from the objects. By wearing the artificial receptor, one can immediately receive spatial information of a nearby object via auditory signals. The soft artificial electroreceptor is expected to expand the ways we can perceive space by providing a new sensory modality that did not evolve naturally in human beings.
계단형 텅스텐 결정면의 질소 흡착에 관한 연구 : Ⅱ. W(210) 및 W(310)면
최대선(D. S. Choi),한종훈(J. H. Han),백선목(S. M. Paik),박노길(N. G. Park),김욕욱(Y. W. Kim),황정남(C. N. Whang) 한국진공학회(ASCT) 1996 Applied Science and Convergence Technology Vol.5 No.4
장전자 방출법으로 텡스텐 (210)면 및 (310)면(100)면의 질소 흡착에 의한 일함수의 변화에 heat of desorption을 측정하였으며 Thermal Desortion Spectra(TDS) 결과로부터 adsorption site를 예측하였다. 텅스텐 (210)면 및 (310)면에 에 질소가 흡착될 때 흡착율에 따라 일함수는 증가하다가 각 면에 대하여 흡착율 5 Langmuir일때 최대 변화량 0.29 eV및 0.20 eV에서 포화되었다. TDS 결과는 이 면들은 낮은 dose의 영역에서 각각 3개의 흡착 site가 있음을 보였으며 이 흡착 site들 중 α₁state의 spectrum의 강도는 (210)면에서 보다 (310)면에서 상대적으로 강해짐을 보였다. 또한 (210)와 (310)면의 α₁ 과 β₂ state의 흡착 site에 흡착된 질소의 dipole moment의 방향은 이 흡착 site들에 대응되는 (100)면의 α₁ 과 β₂state의 흡착 site에 흡착된 질소의 dipole moment의 방향과 반대 방향으로 측정되었으며 이 현상으로부터 질소의 상대적인 흡착 위치를 예측하였다. The heat of desorption and the work function change induced by nitrogen adsorption on the stepped tungstein surface planes, W(210) and W(310), are measured using the Field Electron Emission Microscope(FEM). The adsoption sites are predicted from the Thermal Desortion Spectra(TDS). The work function change of both W(210) and W(310) planes increase as increasing the nitrogen dose and saturates at the nitrogen dose about 5 Langmuir to 0.29 eV and 0.20 ev respectively. We find three adsorption site on each plane for the low dose range. The TDS result shows that the intensity of α₁, state on W(310) is much stronger than that of α₁ state on W(210), and the direction of nitrogen dipole moment adsorbed on the sites correspond to α₁, and β₂ states on W(210) and W(310) planes are in the opposite direction to that of the equivalent states on W(100) plane. From this observation we can predict the relative atomic position in the zdirection (perpendicular direction to the surface) of nitrogen molecules/atoms adsorbed on these sites.
발화합성용액의 pH가 Y<sub>1</sub>Ba<sub>2</sub>Cu<sub>3</sub>O<sub>7-x</sub> 초전도상 생성 속도에 미치는 영향
박정식,김영순,양석우,김춘영,신형식,Park, J.S.,Kim, Y.S.,Yang, S.W.,Kim, C.Y.,Shin, H.S. 한국공업화학회 1998 공업화학 Vol.9 No.2
$Y_2O_3$(99.9%)와 $BaCO_3$(99.9%) 및 CuO(99.9%)를 사용하여 $Y_1Ba_2Cu_3O_{7-x}$(123) 분말을 발화합성법에 의해 제조하였다. 발화전 용액을 여러 가지 pH로 변화시켜 제조하였으며, 이 분말을 성형하여 열처리 온도와 시간 변화에 따른 상형성과 반응특성을 조사하였다. 시료의 조성과 조직의 특성은 ICP와 SEM을 이용하여 측정하였고, Y-Ba-Cu-O계의 상형성과 전화율을 결정하기 위해 X선 회절분석을 하였다. 발화합성법을 이용하여 pH 7(${\pm}0.3$)에서 제조된 123 분말이 순도와 균일성 및 반응특성에서 가장 좋은 결과를 보였다. pH 7(${\pm}0.3$)에서 제조된 분말을 이용한 123 상생성에 따른 활성화에너지(${\Delta}E_a$)는 191kJ/mol으로서 고상반응법의 230kJ/mol에 약 13% 정도 더 낮았다. The $Y_1Ba_2Cu_3O_{7-x}$(123) superconductor powders were prepared by pyrophoric synthesis method(PSM) using $Y_2O_3$(99.9%), $BaCO_3$(99.9%), and CuO(99.9%) powders. The phase formation and reaction kinetics of 123 superconductor manufactured with powders prepared in various pHs of pyrophoric synthetic solution have been studied through the experiments at various heat treatment temperatures and times. Inductively coupled plasma(ICP) spectroscopy and scanning electron microscopy(SEM) measurements were performed to examine the composition and morphology of the sample. X-ray diffraction(XRD) analysis was done to determine phase formation and conversion ratio of Y-Ba-Cu-O systems. The 123 powder prepared at pH 7(${\pm}0.3$) yields the best result in terms of purity, homogeneity, and reactivity. The activation energies(${\Delta}E_a$) of 123 phase formation were found to be 191 kJ/mol and 230kJ/mol in solid state reaction method and pyrophoric synthesis method, respectively.
Gill, S.S.,Oh, H.W.,Lee, D.W.,Roh, J.Y.,Park, H.W.,Jin, B.R.,Je, Y.H.,Kang, S.K. 東亞大學校附設遺傳工學硏究所 1998 遺傳工學硏究 Vol.- No.5
J.Y.ROH,H.W.PARK,Y.H.JE,D.W.LEE,B.R.JIN, H.W.OH,S.S.GILL AND S.K.KANG.1997. Bacillus thuringiensis NTB-1 isolated from soil samples in Korea produces ovoidal parasporal inclusions with proteins of approximately 24-40kDa in size. Although serological study indicated that the isolate has a flagella (H) antigen identical with subsp. israelensis, it seemed to be non-insecticidal against Lepidoptera and Coleoptera as well as Diptera. To investigate the activity of non-insecticidal B.thuringiensis transformed with insecticidal crystal protein genes, cryIVD and cytA genes of B. thuringiensis subsp. morrisoni PG-14, highly toxic to mosquito larvae, were introduced into the isolate NTB-1. The expression of mosquitocidal crystal protein genes in NTB-1 was characterized by SDS-PAGE analysis and electron microscopy. The results showed that crystalline inclusions of host, CryIVD and CytA were stably expressed in the transformant. However, the mosquitocidal activity of transformant was similar to that of B. thuringiensis subsp. kurstaki Cry-B harbouring cryIVD and cytA genes, demonstrating that a synergistic effect by an interaction of both introduced insecticidal and resident non-insecticidal crystal proteins was not observed.
김낙환(N . H . Kim),박주완(J . W . Park),정영철(Y . C . Jung),박영일(Y . I . Park) 한국축산학회 1992 한국축산학회지 Vol.34 No.3
Three different crosses, Y × L, D × YL and DY × YL were performance tested to compare the body weights at different ages, average daily gains, feed effiency, dressing percent, carcass length, backfat thickness, marbling score, lean meat percent and growth pattern. A total of 101 barrows and gilts were tested to an average final weight of 109 ㎏. The pigs were allowed free access to creep feed from 10 days of age and were full fed from weaning at 25 days to the final weight. Average daily gains and feed effiency were best in D × YL, followed in rank by DY × YL and Y × L. The body weight at 32, 70, 90, 110, 130 and 150 days of age were highest in D × YL. The lower average daily gains, poor feed effiency and smaller body weights of Y × L at different ages as compared with D × YL and DY × YL were considered to be due mainly to the difference in level of maternal heterosis. The Y × L had higher dressing percent and lean meat percent, longer carcass and thinner backfat than the other two crosses. The DY × YL tended to have slightly more intra-muscular fat. The equation derived to estimate the growth curve was Log_e W = 47.5327 - 34.3029 × LogeD + 8.2993 × (Log_eD)² - 0.6326 × (Log_eD)³ (R²= 0.9718) for Y × L barrows, Log_e W=0.1764 + 0.1284 × (Log_eD)² - 0.0000002 × D³ + 0.0123 × D (R² = 0.9836) for D × YL barrows, Log_e W = 0.1764 + 0.0123 × D - 0.0000002 × D³ + 0.1284 × (Log_eD)² (R² = 0.9851) for DY × YL barrows and Log_e W = 25.8570 - 19.4688 × Log_e D + 4.9968 × (Log_eD)² - 0.3920 × (Log_e D)³ (R² = 0.9903) for DY × YL gilts.
Tsukamurella carboxydivorans sp. nov., a carbon monoxide-oxidizing actinomycete
Park, S. W.,Kim, S. M.,Park, S. T.,Kim, Y. M. Microbiology Society 2009 International journal of systematic and evolutiona Vol.59 No.6
<P>A Gram-positive, slightly acid-alcohol-fast, carbon monoxide-oxidizing bacterium, strain Y2(T), was isolated from a soil sample collected from a roadside in Seoul, Korea. On the basis of 16S rRNA gene sequence comparative analyses, strain Y2(T) was shown to belong to the genus Tsukamurella and was most closely related to Tsukamurella tyrosinosolvens DSM 44234(T) (GenBank accession no. AY238514; 99.8 %). The predominant fatty acids were C(18 : 1)omega9c and C(16 : 0). The cell-wall peptidoglycan of strain Y2(T) contained meso-diaminopimelic acid as the diagnostic diamino acid. Strain Y2(T) contained galactose and arabinose as the whole cell sugars. The DNA G+C content was 77 mol%. The DNA-DNA relatedness value between strain Y2(T) and T. tyrosinosolvens DSM 44234(T) was 62.7 %. Based on the combination of the carbon source utilization pattern, fatty acid profile, cell-wall chemotype, DNA G+C content and DNA-DNA hybridization experiments, it is proposed that strain Y2(T) (=KCCM 42885(T)=JCM 15482(T)) represents the type strain of a novel species, Tsukamurella carboxydivorans sp. nov.</P>
Introduction of virtual open chamber for testing a weather modification technique in Korea
J-W Cha,K-H Chang,M-J Lee,J-Y Jeong,J-W Jung,H-Y Yang,K-L Kim,Y-C Kim,C-H Kim,K-H Nam,M-K Suk,C-K Jung,H-Y Go,J-H Chae,G-W Lee,Y-H Cho,S-H Jung,H-M Park,Y-A Oh,J-Y Jung,B-G Kim,Y-J Kim,M-H Choi,S-D Ki 한국기상학회 2009 한국기상학회 학술대회 논문집 Vol.2009 No.4
Park, S R,Kong, S-Y,Nam, B-H,Choi, I J,Kim, C G,Lee, J Y,Cho, S J,Kim, Y W,Ryu, K W,Lee, J H,Rhee, J,Park, Y-I,Kim, N K Nature Publishing Group 2011 The British journal of cancer Vol.104 No.7
<P><B>Background:</B></P><P>We evaluated the association between polymorphisms of cytochrome P450 2A6 (<I>CYP2A6</I>)/excision repair cross-complementation group 1 (<I>ERCC1</I>)/X-ray repair cross-complementing group 1(<I>XRCC1</I>) and treatment outcomes of metastatic gastric cancer (MGC) patients treated with S-1/cisplatin.</P><P><B>Methods:</B></P><P>Among MGC patients (<I>n</I>=108), who received S-1 (40 mg m<SUP>−2</SUP> b.i.d., days 1–14) and cisplatin (60 mg m<SUP>−2</SUP>, day 1) every 3 weeks, we analysed the wild-type allele (<I>W</I>) and variants (<I>V</I>) of <I>CYP2A6</I> (<I>*4</I>, <I>*7, *9, *10</I>), and the polymorphisms of <I>ERCC1</I> (rs11615, rs3212986) and <I>XRCC1</I> (rs25487).</P><P><B>Results:</B></P><P>Patients having fewer <I>CYP2A6</I> variants had better response rates (<I>W</I>/<I>W vs W</I>/<I>V</I> other than <I>*1/*4 vs V</I>/<I>V</I> or <I>*1/*4</I>=66.7 <I>vs</I> 58.3 <I>vs</I> 32.3% <I>P</I>=0.008), time to progression (TTP) (7.2 <I>vs</I> 6.1 <I>vs</I> 3.5 months, <I>P</I>=0.021), and overall survival (23.2 <I>vs</I> 15.4 <I>vs</I> 12.0 months, <I>P</I>=0.004). <I>ERCC1 19442C</I>><I>A</I> (rs3212986) was also associated with response rate (<I>C/C</I>, 46.7% <I>vs C/A</I>, 55.3% <I>vs A/A</I>, 87.5%) (<I>P</I>=0.048) and TTP (4.4 <I>vs</I> 7.6 <I>vs</I> 7.9 months) (<I>P</I>=0.012). Patients carrying both risk genotypes of <I>CYP2A6</I> (<I>V</I>/<I>V</I> or <I>1/*4</I>) and <I>ERCC1 19442C</I>><I>A</I> (<I>C/C</I>) <I>vs</I> those carrying none showed an adjusted odds ratio of 0.113 (<I>P</I>=0.004) for response, and adjusted hazard ratios of 3.748 (<I>P</I>=0.0001) for TTP and 2.961 (<I>P</I>=0.006) for death.</P><P><B>Conclusion:</B></P><P>Polymorphisms of <I>CYP2A6</I> and <I>ERCC1 19442C</I>><I>A</I> correlated with the efficacy of S-1/cisplatin.</P>