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High quality Mn-doped (Na,K)NbO3 nanofibers for flexible piezoelectric nanogenerators.
Kang, Han Byul,Chang, Jiyoung,Koh, Kisik,Lin, Liwei,Cho, Yong Soo American Chemical Society 2014 ACS APPLIED MATERIALS & INTERFACES Vol.6 No.13
<P>Enhanced piezoelectric and energy-harvesting characteristics of Mn-doped (Na0.5K0.5)NbO3 (NKN) nanofibers have been investigated with actual fabrication of potential flexible nanogenerators. The electrospinning process of nanofibers has been initially optimized with the proper level of chelating agent and annealing temperature. High quality nanofibers are successfully obtained only by means of a certain level of doped-Mn, which incorporates into the NKN perovskite structure and facilitates significant grain growth. A single-particle-stacked structure along the direction of fiber length becomes more evident with increasing Mn content. An XPS analysis confirms that Mn exists in multivalent states of Mn(2+)/Mn(3+). The effective piezoelectric coefficient of the nanofibers is found to be enhanced by 5 times with Mn-doping up to 3 mol % as characterized by piezoelectric force microscopy. The resultant flexible nanogenerators on PES films have exhibited 0.3 V output voltage and 50 nA output current under a bending strain.</P>
Kang, Han-Byul,Park, Jongwoo,Bae, Jee-Hwan,Yang, Cheol-Woong The Japan Institute of Metals 2010 MATERIALS TRANSACTIONS Vol.51 No.10
<P>This study examined the crystallization behavior of electroless Ni-P UBM with an medium phosphorous content (∼15 at%) induced by a single and step heat treatment using <I>in-situ</I> transmission electron microscopy (TEM). Different heat treatment processes affected the crystallization behavior of electroless Ni-P UBM. After single heat treatment at 300°C for 60 min, the electroless Ni-P UBM contained Ni and Ni<SUB>3</SUB>P. In addition to Ni and Ni<SUB>3</SUB>P, more complex Ni-P compounds, such as Ni<SUB>12</SUB>P<SUB>5</SUB> and Ni<SUB>5</SUB>P<SUB>2</SUB> formed in the electroless Ni-P UBM resulting from a step heat treatment at 150°C for 60 min followed by 300°C for 60 min.</P>
Jang, Han Byul,Hwang, Joo-Yeon,Park, Ji Eun,Oh, Ji Hee,Ahn, YounJhin,Kang, Jae-Heon,Park, Kyung-Hee,Han, Bok-Ghee,Kim, Bong Jo,Park, Sang Ick,Lee, Hye-Ja BMJ Publishing Group Ltd 2014 Journal of medical genetics Vol.51 No.12
<P><B>Background</B></P><P>A low serum level of high-density lipoprotein cholesterol (HDL-C) is a risk factor for cardiovascular disease. Proprotein convertase subtilisin/kexin type 5 (<I>PCSK5</I>) modulates HDL-C metabolism through the inactivation of endothelial lipase activity.</P><P><B>Methods</B></P><P>Therefore, we analysed the effects of <I>PCSK5</I> on HDL-C and investigated the association between genetic variation in <I>PCSK5</I> and dietary polyunsaturated fatty acids (PUFAs) intakes in Korean adults and children. This population-based study which was conducted in South Korea included 4205 adults (43% male) aged 40–69 years and 1548 children (48.6% boys) aged 8–13 years. Dietary intake was assessed using a semiquantitative food frequency questionnaire in adults and modified 3-day food records in children.</P><P><B>Results</B></P><P>After adjustments for age and body mass index, we identified a significant association between SNP rs1029035 of the <I>PCSK5</I> gene and HDL-C concentrations specifically for men in both populations (adults, p=0.004; children, p=0.003; meta, p=7×10<SUP>−4</SUP>). Additionally, the interaction between the <I>PCSK5</I> rs1029035 genotype and dietary polyunsaturated fatty acids intake influenced serum HDL-C concentrations in men (adults, p=0.001; children, p=0.008). The deleterious effect of the C allele on serum HDL-C was present only when dietary PUFA intake was less than the dichotomised median level (adults, p=0.011; children, p=0.001). Serum HDL-C concentrations were decreased in men with the C allele genotype and low consumption of dietary PUFA including n-3 and n-6.</P><P><B>Conclusion</B></P><P>According to these results, men carrying of the C allele were associated with low HDL-C concentrations and might exert beneficial effects on HDL-C concentrations following consumption of a high-PUFA diet.</P>
오버행 구조를 갖는 LSPM의 3D FEM과 등가회로법을 이용한 특성해석
강한별(Han byul Kang),김병택(Byung taek Kim),류세현(Se hyun Rhyu),권병일(Byung il Kwon) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.4
This paper shows the characteristic analysis of single-phase LSPM(Line Start Permanent Magnet) synchronous motor considering overhang structure. To obtain the dynamic and steady performance of the motor, the D-Q equivalent circuit is used and the circuit parameters are extracted by 3D FEM. The performance of the model with overhang is compared with conventional model without overhang on the condition that both models have the same volume of the permanent magnet.
오버행 효과를 고려한 단상 유도동기전동기의 특성해석 및 설계
강한별(Han-Byul Kang),金炳澤(Byung-Taek Kim),白守黃(Soo-Whang Baek),金弘錫(Hong-Seck Kim),權丙一(Byung-Il Kwon) 대한전기학회 2009 전기학회논문지 Vol.58 No.1
This paper shows the characteristic analysis of single-phase line start permanent magnet (LSPM) motors considering the overhang structure. To achieve the low-cost design of an LSPM motor, the overhang structure is adapted for the rotor with a constraint of a fixed magnet volume. To obtain the dynamic and steady performance of the motor, the circuit parameters are extracted using the 3D-static FEM(Finite Element Method) and the d-q equivalent circuit is used. The performance of the model with overhang is compared with the conventional model without overhang on the condition that both models have a fixed volume for the permanent magnet.
Han, Rafael Taeho,Kim, Han-Byul,Kim, Young-Beom,Choi, Kyungmin,Park, Gi Yeon,Lee, Pa Reum,Lee, JaeHee,Kim, Hye young,Park, Chul-Kyu,Kang, Youngnam,Oh, Seog Bae,Na, Heung Sik The Korean Society of Pharmacology 2018 The Korean Journal of Physiology & Pharmacology Vol.22 No.2
Recent studies have provided several lines of evidence that peripheral administration of oxytocin induces analgesia in human and rodents. However, the exact underlying mechanism of analgesia still remains elusive. In the present study, we aimed to identify which receptor could mediate the analgesic effect of intraperitoneal injection of oxytocin and its cellular mechanisms in thermal pain behavior. We found that oxytocin-induced analgesia could be reversed by $d(CH_2)_5[Tyr(Me)^2,Dab^5]$ AVP, a vasopressin-1a (V1a) receptor antagonist, but not by $desGly-NH_2-d(CH_2)_5[D-Tyr^2,Thr^4]OVT$, an oxytocin receptor antagonist. Single cell RT-PCR analysis revealed that V1a receptor, compared to oxytocin, vasopressin-1b and vasopressin-2 receptors, was more profoundly expressed in dorsal root ganglion (DRG) neurons and the expression of V1a receptor was predominant in transient receptor potential vanilloid 1 (TRPV1)-expressing DRG neurons. Fura-2 based calcium imaging experiments showed that capsaicin-induced calcium transient was significantly inhibited by oxytocin and that such inhibition was reversed by V1a receptor antagonist. Additionally, whole cell patch clamp recording demonstrated that oxytocin significantly increased potassium conductance via V1a receptor in DRG neurons. Taken together, our findings suggest that analgesic effects produced by peripheral administration of oxytocin were attributable to the activation of V1a receptor, resulting in reduction of TRPV1 activity and enhancement of potassium conductance in DRG neurons.
Kang, Kyung Wook,Kang, Dae Won,Kwon, Gu Ye,Kim, Han Byul,Noh, Kyoung Min,Baek, Gi Hyun,Cha, Jin Kwan,Kim, Hyun Hee korean Academy of Physical Therapy Rehabilitation 2015 Physical therapy rehabilitation science Vol.4 No.1
Objective: Cervical stabilization exercises are frequently to improve strength and endurance of cervical muscles. The purpose of this study was to identify changes in head repositioning accuracy (HRA) and neck proprioception through cervical stabilization exercises in healthy adults. Design: One group pretest-posttest design. Methods: Thirteen participants with no previous history of neck pain or injury to the cervical spine were recruited. HRA was measured by equipment including laser pointer, helmet, eye patch and marking pens. The distance between the spot where the beam had stopped and the center of the graph paper was measured three times with the averaged value used as the head repositioning accuracy. Neck proprioception was measured by a cervical range of motion device (CROM). Subjects wore the CROM tester and were to look straight ahead while bending his/her neck. Subjects were instructed to perform extension, lateral flexion and rotation, and the values were then measured and recorded. The measurements were performed pre-intervention, and after cervical stabilization exercise. Results: There was no significant difference on HRA after intervention. In addition, there was no significant difference on neck proprioception compared with pre-intervention. Conclusions: The present study did not identify any effect on HRA and neck proprioception of cervical stabilization exercise. Further investigations are required to elucidate this in old aged participants and patients with neck pain.
김한별(Han Byul Kim),강민주(Min Joo Kang),안형승(Hyung Seung An),김태규(Tae Gyu Kim),김세형(Sae Hyung Kim) 한국체육측정평가학회 2014 한국체육측정평가학회지 Vol.16 No.2
이 연구는 한국양궁선수 경기력 결정요인을 탐색하는 데 목적이 있다. 20명의 양궁 전문가들에게 3차에 걸친 델파 이 검증 방법을 적용하였다. 델파이 검증을 통해 결정된 문항과 척도를 한국양궁선수들 463명(남자 220명, 여자 243 명)을 대상으로 조사하였고, Rasch 평정척도모형을 적용하여 응답범주의 적절성과 문항의 적합도를 검증하였다. 델파 이 검증에서는 CVR(content validity ratio) 지수를 산출하기 위해 Excel 프로그램을 사용하였고, Rasch 평정척도모 형 분석을 위해 WINSTEPS 프로그램을 사용하였다. 문항의 적합도 기준은 내적합 지수 또는 외적합 지수가 .80 미 만일 때 과적합 문항, 1.20을 초과할 때 부적합 문항으로 판단하였다. 델파이 1차 조사에서 3요인 27문항(체력요인 7 문항, 기술요인 10문항, 심리요인 10문항)으로 결정되었고, 델파이 2차 조사에서 각 요인마다 한 문항씩 제거되었다 (체력요인 문항7; 기술요인 문항9; 심리요인 문항5). 델파이 3차 검증에서는 체력요인에 문항1, 기술요인에 문항1, 문 항4, 문항10, 그리고 심리요인에 문항2, 문항8, 문항10이 CVR 기준(>0.42)을 만족하지 못하는 것으로 나타났다. 델 파이 검증으로 결정된 3요인 17문항(체력요인 5문항, 기술요인 6문항, 심리요인 6문항)의 응답범주의 적절성 검증 결 과 7점척도보다 5점척도가 상대적으로 더 적합한 것으로 나타났다. 요인별 문항의 적합도 검증 결과, 체력요인에서 한 문항(문항4)이 과적합하게 나타났으며, 심리요인에서 한 문항(문항1)이 부적합하게 나타났다. 따라서 최종 3요인 15문 항(체력요인 4문항, 기술요인 6문항, 심리요인 5문항)으로 구성된 한국양궁선수 경기력 결정요인을 탐색하였다. The purpose of this study was to search important factors of Korean Archers" Performance using the Delphi technique and Rasch model. In delphi test, based on the literature review and consultation of content and measurement in the twenty experts, 3-factor 17-item(fitness factor 5-item, skill factor 6-item, mental factor 6-item) was generated. CVR(content validity ratio) score criterion(>0.42) was also used to verify in the delphi test. The scale was administered to 463 Korean elite archeries. Rasch measurement computer program, WINSTEPS, was used to analyze the data. Model data fit was determined by Infit and Outfit statistics (>0.80 and <1.20). The 7 rating categories that used in delphi test functioned bad. It"s adjusted by the 5 rating categories; threshold advanced with category. The one item was eliminated in the fitness factor(infit and outfit statistics index were under 0.80). and the one item was also eliminated in the mental factor(infit and outfit statistics index were over 1.20). Results showed that determination factors of Korean archers" performance were 3-factor 15-item(fitness factor 4-item, skill factor 6-item, mental factor 5-item).