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단상 유도형 동기 전동기(LSPM)의 특성해석에 관한 연구
정대성,김승주,이진헌,최재학,이주,Jung, Dae-Sung,Kim, Seung-Ju,Lee, Jin-Hun,Choi, Jae-Hak,Lee, Ju 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.3
가전분야에서의 전동기 효율향상을 통한 에너지 소비절감 효과는 상당히 크지만 이를 위한 전동기의 설계/해석 기술 확보가 아직은 미흡한 상태이다. 이에 따라 유도형 동기전동기가 제안되었지만, 유도형 동기 전동기는 유도전동기와 통기전동기의 특성을 동시에 가지고 있어, 해석 및 설계가 쉽지 않다. 따라서 본 논문에서는 기존의 냉장고 압축기용 전동기인 단상유도전동기를 대처할 수 있는 단상 유도형 동기전동기를 이용해 파라미터에 따라 특성이 어떻게 바뀌는가에 대해 서술하였다. 그에 따라 단상유도전동기의 정상상태 특성을 해석하고 제안모델의 성능을 기존모델과 비교하고 실험하여 해석결과의 신뢰성을 검증한다. 또한 본 논문에서는 제안모델의 기존 고정자 형상이나 권선 스팩을 유지하고 회전자의 형상이나 구조만을 변경시켜 성능향상을 도모하였다. 해석방법으로는 전자장 수치 해석적인 방법으로 널리 이용되고 있는 유한요소법(Finite Element Method : FEM)을 이용하였다. Electric motor efficient improvement from home appliance field is important to the effect reducing the energy consumption. But the electric motor design/analysis technology is still insufficient. Specially the electric motor design/analysis technology of satisfying characteristic of both the induction motor and the synchronous motor such as Line start permanent motor. Therefore the electric motor design/analysis technology is urgently demanded reliability. This paper proposes the sing1e-phase line-start permanent magnet motor to develop the motor it with be able to alternate the sing-phase induction motor it is a refrigerator compressor motor. The sing-phase induction motor is analyzed in the steady state. And we have a certification test to compare our single-phase line-start permanent magnet motor with the sing-phase induction motor. In order to improve the performance, the stator of the single-phase line-start permanent magnet motor is same as the stator of the sing-phase induction motor and changes the rotor form and has the permanent magnet. It used the Finite Element Method(FEM) which is widely used with electronic-magnetic field numerical analysis method.
Choi, Wonkyung,Son, Seongkil,Song, Sang-Hun,Kang, Nae Gyu,Park, Sun-gyoo Society of Cosmetic Scientists of Korea 2020 Korean journal of cosmetic science Vol.2 No.1
The aim of this study is to investigate the effect of various pentapeptides on hair repair depending on the characteristics of comprising amino acids using crosslinking agents in hair. Total ten peptides were synthesized with two kinds of amino acids respectively, of which were previously categorized according to R group of the amino acids contributing to the characteristic of each peptide: STTSS (Ser-Thr-Thr-Ser-Ser), LIILL (Leu-Ile-Ile-Leu-Leu), CMMCC (Cys-Met-Met-Cys-Cys), DEEDD (Asp-Glu-Glu-Asp-Asp), RKKRR (Arg-Lys-Lys-Arg-Arg), TAMRA-STTSS, TAMRA-LIILL, TAMRA-CMMCC, TAMRA-DEEDD, and TAMRA-RKKRR. Pentapeptide alone, or pentapeptides with crosslinking agents such as polymeric carbodiimide (PCI) and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) were treated to chemically damaged hair. Hair diameter and break strength (N = 40/case) were measured to calculate tensile strength of hair for computing hair repair ratio, and fluorescence yields (N = 20/case) were collected for hair treated with TAMRA-peptides. The tensile strength of hair treated with pentapeptides alone, or pentapeptides with cross-linking agents is consistent with the fluorescence yield from the microscope images of the cross-sectioned hair in vision and in numerical values. Pentapeptides consisting of hydrophobic amino acids (LIILL), amino acids with sulfur (CMMCC), and basic amino acids (RKKRR) increased the tensile strength in perm-damaged hair. Pentapeptides with no extra carboxyl/amine groups in R group of amino acids resulted in no significant differences in hair strength and fluorescence yield among hairs treated with alone and with crosslinkers. Pentapeptides with extra carboxyl groups or amine groups enabled further strengthening of hair due to increased bonds within the hair after carbodiimide coupling reaction. The hair repairs of pentapeptides with various amino acid sequences were studied using crosslinking. Depending on the physical characteristics of comprising amino acids, the restoration of damaged hair was observed with tensile strength of hair and fluorescence signals upon cross-sectioned hair in parallel to possibly understand the binding tendency of each pentapeptide within the hair.
Effects of Sumsu (Bufonis venenum) Pharmacopuncture Treatment on Depression in Mice
Choi, Min-Ji,Kim, Ka-Na,Lee, Jae-Eun,Suh, Jin-Woo,Kim, Sung-Chul,Kwon, Ki Rok,Cho, Seung-Hun KOREAN PHARMACOPUNCTURE INSTITUTE 2014 Journal of pharmacopuncture Vol.17 No.2
Objectives: The main objective of this study was to evaluate the anti-depressant effects of pharmacopuncture using sumsu (Bufonis venenum). Methods: Animals were divided into three groups (control, sham, and experimental), with eight mice per group. The sham and the experimental groups were exposed to 2 hours of immobilization stress daily for 14 days. They were also injected with normal saline (sham) or subjected to pharmacopuncture with sumsu at the acupoints HT7, SP6, and GV20 (experimental). The depression or anxiety-like behaviors of the mice in each group were evaluated 1 day after treatment. Results: There was no difference in locomotor activity between the groups during the open-field test; i.e., all groups had normal motor function. However, the open-field and the forced-swimming tests revealed that depression and anxiety-like behaviors were decreased significantly in the group treated with sumsu pharmacopuncture. Conclusion: Sumsu pharmacopuncture attenuated depressive or anxiety-like behavior in mice stressed with chronic immobilization. These results suggest that sumsu pharmacopuncture has therapeutic potential for treating neuropsychiatric disorders such as anxiety or depression disorder.
New Simulation Method of Flashover Rate by Connection of EMTP and MATLAB
Hun-Chul Seo,Joon-Han,Sun-Kyu Choi,Byung-Sung Lee,Chul-Hwan Kim 대한전기학회 2016 Journal of Electrical Engineering & Technology Vol.11 No.3
Because of the random characteristics of lightning, the Monte Carlo method is applied to estimate the flashover rate due to lightning, however, the simulations using previous methods are difficult to both beginner and expert in power corporations. Therefore, this paper proposes the new and easy method to simulate the flashover rate by connection of electromagnetic transients program (EMTP) and MATLAB. The magnitude of a lightning strike is based on a curve measured in the field, while the classification of direct and indirect lightning depends on the striking distance. In a Korean distribution system, the flashover rate induced by lightning is simulated using proposed method. Simulations of the footing resistance according to the existence of an overhead ground wire (OHGW) are performed and the simulation results are discussed. The simulation results are compared with findings obtained with the IEEE Flash 2.0 program.
Sang Wook Kim(김상욱),Ji Hye Jung(정지혜),Kwan Suk Kim(김관석),Cheol Koo Lee(이철구),Jong Joo Kim(김종주),Bong Hwan Choi(최봉한),Tae Hun Kim(김태헌),Ki Duk Song(송기덕),Byung Wook Cho(조병욱) 한국생명과학회 2007 생명과학회지 Vol.17 No.11
본 연구는 돼지 4번 염색체에서 FAT1 좌위의 후보유전자인 Adipocyte Fatty-Acid 결합단백질 (FABP4) 유전자에서 8개의 Single Nucleotide Polymorphisms (SNPs) 를 발견하였다. Duroc, Landrace, Berkshire, Yorkshire를 기초 축으로 이용한 800두에 대해 FABP4 유전자의 단일염기 분석과 PCR-RFLP를 이용하여 그 다형성을 조사하고 돼지의 일당증체량, 등지방두께, 사료요구율, 정육율과 그 유전자형 간의 연관성을 규명하고자 실시하였다. FABP4 유전자에 대해 각 단일염기에 관한 PCR-RFLP를 이용하여 400~800 bp 산물을 증폭한후 각각의 제한효소로 사용하여, 얻어진 FABP4 유전자의 빈도는 품종별로 다르게 나타났다. 통계적 분석을 통하여 각 유전자형에 대한 경제형질과 연관성을 분석한 결과 일당증체량, 등지방두께, 정육율, 사료요구량은 다른 유전자형을 가진 개체들이 유의적으로 우수한 능력을 보였다 (P<0.05). FABP4유전자는 일당증체량, 정육율, 등지방두께 에 높은 연관성이 있음을 관찰하였다. 따라서 돼지의 성장과 정육율에 관련된 선발력을 높이기 위해서 FABP4 유전자의 다형성 분석에서 검증된 PCR marker를 우량돼지육종 계획에 있어 분자생물학적 선발 marker로 사용할 수 있을 것으로 사료된다. We found 8 single nucleotide polymorphisms (SNPs) in adipocyte fatty acid bonding protein (FABP4) gene as candidate gene of FAT1 locus on pig chromosome 4. With over 800 heads of major commercial pig breeds including Duroc, Landrace, Berkshire and Yorkshire, we analyzed SNPs of FABP4 gene to determine possible effects of FABP4 genotype to economically important traits. 400~800 bp amplicons in FABP4 gene were used PCR-RFLP for each SNPs and we found that the frequency of some SNPs of this gene was different among the breeds. According to the statistical analyses to determine possible associations of each genotype with economic traits, it was found that subgroup with different genotypes showed significant differences in daily gain, backfat thickness, lean percentage and feed conversion ratio (P<0.05). Thus, as a part of enhancing the selection competence related to swine growth rate and lean percentage, it is expected that FABP4 gene markers verified in this study will be useful to use for Korean commercial pig industry.
Sang Wook Kim(김상욱),Ji Hye Jung(정지혜),Kyung Tag Do(도경탁),Kwan Suk Kim(김관석),Chang Hee Do(도창희),Jun kyu Park(박준규),Young Kuk Joo(주영국),Tae Suk Kim(김태숙),Bong Hwan Choi(최봉환),Tae Hun Kim(김태헌),Ki Duk Song(송기덕),By 한국생명과학회 2007 생명과학회지 Vol.17 No.12
4개의 후보 유전자를 분석해본 결과, 돼지의 주요 염색체 부위 및 유전자들이 주요 경제성 요인들과 관계가 있는 것으로 확인됐다. 양돈업계에서 DNA 기술을 이용한 염색체 정보를 활용하기 위해 본 연구에서는 4개의 후보 유전자에서 생성된 중합효소연쇄반응(PCR) 생성물을 비교 재 서열 함으로써 단일염기변이(SNP) 표지들을 개발했다. 또한 이들 4개의 SNP에 대해 PCR 제한효소 절편길이 다형 성(RFLP) 분석을 전개한 후, 이를 대한민국내 버크셔 종 돼지 개체군의 유전자형을 분석하는데 활용했다. 본 연구는 유용한 단일염기변이를 식별하고 돼지개체군 내 경제적으로 중요한 특성들과 SNP의 연관성을 확인하는 데 그 목적이 있다. This study was conducted to identify useful single nucleotide polymorphisms (SNPs) and determine their association with economically important traits in pig population. Four candidate gene analyses have identified important chromosomal regions and major genes associcated whit economic traits of the pig. For application of the chromosomal information to the pig industry using DNA technology, SNP markers were developed by comparative re-sequencing of polymerase chain reaction (PCR) products of 4 candidate genes (CSF2, IL4, MYOD, RIP140). PCR restriction fragment length polymorphism (PCR-RFLP) assays were developed for these 4 SNPs and used to genotype Berkshire pig populations in Korea.