재래한우의 혈청단백질 좌위의 유전적 다형분석

정재록,김계웅,유재영 공주대학교 자원과학연구소 2000 資源科學硏究論文集 Vol.8 No.-

The study was carried out in order to investigate the genetic polymorphism of serum protein, Albumin(Al) and Transferrin(Tf) through polyacrylamide gel electrophoresis (PAGE) in native Hanwoo. Blood samples were collected and examined from a total of 90 cattle raising in Yesan district in Chungnam province. The results obtained were as follows; 1. The distributions of genotype for Al AA and Al AB at Al loci were 96.7%(87 heads), and 3.3%(3 heads), respectively. The homozygous genotype, Al BB was not detected in this experiment. 2. The frequencies of genes for AlA and AlB were 0.983 and 0.017, respectively. Therefore, these population of Hanwoo group had been maintaining genetic equilibrium (P>0.05). 3. The distributions of genotype for Tf AA, Tf AD1, Tf AD2, Tf AE, Tf D1D1, Tf D1D2, Tf D1E Tf D2D2 Tf D2E, and Tf EE were 10.0%, 23.3%, 20.0%, 6.7%, 6.7%, 13.3%, 6.7%, 3.3%, 6.7%, and 3.3%, respectively. 4. The frequencies of genes for TfA, TfD1, TfD2, and TfE were 0.350, 0.284, 0.233, and 0.133, respectively. 5. Al loci were supposed to be controlled by to autosomal codominant allelic genes such as AlA and AlB. However, Tf loci were assumed to be controlled by four codominant allelic genes as TfA, TfD1, TfD2, and TfE.

낙상 검출 시스템 구현

전계록 부산대학교 병원 암연구소 2009 부산대병원학술지 Vol.- No.25

Effective Falls Detection Method Using Two Tri-Axial Accelerometers

Jeon, Gye Rok,Kim, Young Jae,Jeon, Ah Young,Lee, Sang Hoon,Kim, Jae Hyung,Kim, Min Seok,Lee, Seong Ho,Kim, Ji Hyun Trans Tech Publications, Ltd. 2013 Advanced materials research Vol.647 No.-

<P>Falls detection systems have been developed in recent years because falls are detrimental events that can have a devastating effect on health of the elderly population. Current fall detecting methods mainly employ accelerometer to discriminate falls from activities of daily living (ADL). However, this makes it difficult to distinguish real falls from certain fall-like activities such as jogging and jumping. In this paper, an accurate fall detection system was implemented using two tri-axial accelerometers. By attaching the accelerometers on the chest and the abdomen, our system can effectively differentiate between falls and non-fall events.The Diff_Z and Sum_diff_Z parameter resulted in falls detection rate of 100%, respectively.</P>

심전도와 맥파 신호 검출을 위한 일체형 센서 시스템의 구현

전계록(Jeon, Gye-Rok),정동근(Jung, Dong-Keun),김기련(Kim, Gi-Ryun),신범주(Shin, Bum-Joo) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.5

심전도와 맥파를 측정함으로써 구해질 수 있는 맥파전달시간은 심혈관계의 상태를 진단하기 위한 의미있는 지표가 된다. 그러나 맥파를 측정하는 동안 움직이거나, 측정 시에 가해지는 압력이 부정확할 경우, 잘못된 측정 결과를 얻을 수 있다. 이를 해결하기 위하여 본 논문에서는 심전도, 압력맥파 및 광전용적맥파를 동시에 측정할 수 있는 일체형 센서 시스템과 심전도를 지속적으로 측정할 수 있는 금속 전극을 개발하였으며, 실험을 통해 일체형 센서 시스템 및 금속 전극의 유용성을 입증하였다. The pulse transit time(PTT), which is determined by measuring the electrocardiogram(ECG) and pulse wave, gives comprehensive information about the cardiovascular system. However, a little movement of body and/or inaccurate pressure applied to skin during the measurement of pulse wave leads to acquire incorrect results. To overcome such problem, we developed an integrated sensor system which makes it possible to measure ECG, pressure pulse wave(PPW) and photoplethysmograph(PPG) at the same time. Futhermore, we implemented a new metal electrode which enables to continuously measure ECG. We verified that both integrated sensor system and new electrode provide useful effect.

HRV 신호의 웨이브렛 변환에 의한 마취단계별 마취심도 평가 파라미터 개발

전계록(Jeon, Gye-Rok),김명철(Kim, Myung-Chul),한봉효(Han, Bong-Hyo),예수영(Ye, Soo-Young),노정훈(Ro, Jung-Hoon),백승완(Baik, Seong-Wan) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.9

본 연구에서는 마취 단계에서 마취 심도 평가를 위한 파라미터 추출을 수행하였다. 연구대상은 평균 나이 42 ± 9.13세, 신체등급 분류상 1 또는 2 등급에 속하는 산부인과 수술 환자를 선택하였다. 투약제로는 Enflurane으로 전신 마취를 시행하였다. HRV 신호는 ECG 신호로부터 R 피크치 검출 알고리즘에 의해 획득 되었다. HRV 데이터는 전처리 단계를 거쳤고, 마취 단계별 마취심도 평가 파라미터를 개발하기 위하여 마취단계를 마취 전, 마취유도, 수술 중, 각성, 마취 후 등으로 구분하여 시행하였다. 본 연구에서는 마취단계에서 웨이브렛 변환을 이용한 HRV신호 분석 알고리듬이 제안되었다. 세 종류의 웨이브렛 함수를 적용한 PSD 분석 결과 마취 단계에 따라 모두 비슷한 양상을 나 타내었으나, 이들 중 Daubeches 10의 실험 결과가 보다 양호하게 관측되어 마취 단계별 마취심도를 평가할 수 있는 특징 파라미터로서 가장 적절하다는 판단하였다. In this study, the parameter extraction for evaluation of the anesthesia depth in each anesthesia stages was conducted. An object of the this experiment study has studied 5 adult patients (mean ± SD age:42 ± 9.13), ASA classification I and Ⅱ, undergoing surgery of obstetrics and gynecology. Anaesthesia was maintained with Enflurane. HRV signal was created by R-peak detection algorithm form ECG signal. The HRV data were preprocessing algorithm. It has tried find out the anesthesia parameter which responds the anesthesia events and shows objective anesthesia depth according to anesthesia stage including pre-anesthesia, induction, maintenance, awake and post-anesthesia. In this study, proposed algorithm to analysis the HRV(heart rate variability) signal using wavelet transform in anesthesia stage. Three sorts of wavelet functions applied to PSD. In the result, all of the results were showed similarly. But experiment results of Daubeches 10 is better. Therefore, this parameter is the best parameter in the evaluation of anesthesia stage.

Size-tunable carboxylic functionalized Fe₃O₄ nanoparticle and evaluation of its magnetic and dispersion properties

An, Gye Seok,Han, Jin Soon,Shin, Jae Rok,Cha, Ji Hyun,Kim, Bong-Gu,Jung, Yeon-Gil,Choi, Sung-Churl Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.792 No.-

<P><B>Abstract</B></P> <P>The surface functionalization for Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles must be accompanied by the properties necessary for the realization of the driving force for surface attachment of organic or inorganic materials. In this study, the morphological and physicochemical behaviors of carboxylation of clustered Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles with carboxyl polymer precursors, polyacrylic acid, were discussed. The surface functionalization affects the binding energies of the primary particles that maintain the cluster structure, leading to a dramatic change in morphology as the imbalance was caused. As a result, the size of the nanoclusters was controlled according to the content of the precursors, and the recombination for the stabilization of the peeled off primary particles were occurred. Thus, a suitable precursor composition for the carboxylation had been derived. Furthermore, it improved the dispersibility according to the activity of the surface characteristics and caused a change in the magnetic property as the relative size and cluster density decreased.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Magnetic nanoparticles had been dispersed via carboxylic functionalization. </LI> <LI> Amount of PAA affected to the amount of surface charge. </LI> <LI> Scabrous shape had formed by excess repulsive force at high amount of PAA. </LI> <LI> Size of Fe<SUB>3</SUB>O<SUB>4</SUB> was varied from 387 to 175 nm at 1–15 wt% of PAA. </LI> </UL> </P>

Fabrication of core-shell structured Fe₃O₄@Au nanoparticle via self-assembly method based on positively charged surface silylation/polymerization

An, Gye Seok,Shin, Jae Rok,Hur, Jae Uk,Oh, Ah Hyun,Kim, Bong-Gu,Jung, Yeon-Gil,Choi, Sung-Churl Elsevier 2019 JOURNAL OF ALLOYS AND COMPOUNDS Vol.798 No.-

<P><B>Abstract</B></P> <P>This paper describes findings of an investigation of synthesis and assembly of core (Fe<SUB>3</SUB>O<SUB>4</SUB>)-shell (Au) nanoparticles via self-assembly method depending on the electrostatic cross-linking structure of the counterpart material. Positively charged surface modification for electrostatic cross-linking underwent an amination process through silylation/polymerization of silane or polymer precursor which were (3-Aminopropyl)triethoxysilane (APTES), polyethyleneimine (PEI), respectively. The surface modification process for the interfacial reactivity was accompanied by a phenomenological identification and analysis of its physicochemical properties and elucidation of suitable conditions. The density of the shell (Au) was changed according to the difference of relative intensity of surface positive charge and the structural difference of the cross-linker. The results indicated that the formation of Au shell is affected not only by the electrostatic properties from strong positive zeta-potential, but also the terminal surface functional group as a binding site.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fe<SUB>3</SUB>O<SUB>4</SUB>@Au nanoparticle had been prepared by surface amination for self-assembly. </LI> <LI> Surface charge was saturated at 43.4 mV, 3 wt% of PEI, and 34.8 mV, 4 wt% of APTES. </LI> <LI> Ammonia made APTES coating repetitive dual reaction as etchant as well as catalyst. </LI> <LI> Attached amount of Au was 6.1–14.8% at 3–5 wt% of PEI and 1.4–1.6% at 4∼5 wt% of APTES. </LI> <LI> Amount of Au was not only affected by charge difference but amount of amine group. </LI> </UL> </P>

In situ synthesis of Fe₃O₄@SiO₂ core–shell nanoparticles via surface treatment

An, Gye Seok,Han, Jin Soon,Shin, Jae Rok,Chae, Dong Ho,Hur, Jae Uk,Park, Hye-Yeong,Jung, Yeon-Gil,Choi, Sung-Churl Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.11

<P><B>Abstract</B></P> <P>Core–shell structured Fe<SUB>3</SUB>O<SUB>4</SUB>@SiO<SUB>2</SUB> nanoparticles were synthesized through a facile in situ surface-treatment process. Surface treatments of the as-prepared Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles with acid or base caused changes in the shape of spherical particles agglomerated into clusters. The morphological changes of the particles experienced an abrupt change depending on the concentration of the treated acid or base, and the magnetization properties and surface characteristics corresponding to these behaviors were studied. As a result, optimum surface-treatment conditions for depositing SiO<SUB>2</SUB> on the surface were established, and the derivation condition basically included the ideal environment for coating SiO<SUB>2</SUB>. It was possible to coat SiO<SUB>2</SUB> using a sol–gel reaction without going through the removal of residual organics and a solvent displacement process. About 8 nm of a single coating layer was homogeneously formed due to excellent initial dispersibility of Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles according to the modified surface characteristics.</P>

Ag 가 첨가된 비정질 유리반도체 As_2S_3의 물리적 특성

이종록,桂善姬 梨花女子大學校 韓國生活科學硏究院 1987 韓國生活科學硏究院 論叢 Vol.40 No.-

비정질 유리 반도체 As_2S_3에 Ag를 0, 5.7, 9.1, 12. at%로 첨가하여 thermal evaporation방법으로 박막 시료를 만들어 직류 전기 전도도, 광 흡수도를 측정하였다. X선 회절 실험 결과 각 시료는 비정질임이 확인되었다. 273K에서 373K 온도 영역에서의 직류전기 전도도는 7.04x10^-17(Ω^-1cm^-1)에서 8.66x10^-12(Ω^-1cm^-1_의 값을 나타내며 Ag의 농도가 증가함에 따라 직류 전기 전도도는 증가하였다. 직류 전기 전도도는 σ=σ_0exp(-ΔE_α/KT)의 관계식을 만족하고 광학적 에너지 gap은 Ag의 농도가 증가함에 따라 2.34, 2.12, 1.89, 1.78eV로 감소하였다. E_-ΔE_α의 값은 Ag의 농도에 관계없이 거의 일정하였다. D.C. electrical conductivity, optical absorption experiments on glassy semiconductor As_2S_3+Ag for which the Ag concentration is 0, 5.7, 9.1, 12.3 at. % are investigated. The thin film samples are prepared by the thermal evaporation method. From the result of X-ray diffraction experiment, it was convinced that each sample was amorphous semiconductor. Over the temperature range from 273˚K to 373˚K, the d.c. conductivity of the investigated samples is 8.66x10^-12(Ω^-1cm^-1)∼7.04c10^-17(Ω^-1cm^-1). As Ag concentration increases, the electrical d.c. conductivity increases. D.C. conductivities are proportional to inverse of temperature and satisfy the relation σ=σ_0exp(-ΔE_α/KT). The optical energy gap decreases with the Ag concentration having the value of the range from 2.34eV to 1.79eV. It is also shown that the value of difference E_g-ΔE_α is independent of Ag concentration.

저장 탱크 구조변경이 연료유 이송에 미치는 영향

류명록(Myeong-Rok Ryu),이계광(Gye-Gwang Lee),박권하(Kweon-Ha Park) 한국마린엔지니어링학회 2015 한국마린엔지니어링학회지 Vol.39 No.6