우주비행체 진동시험을 위한 신규 대형 수직 가진 시스템 설계

임종민,우성현,은희광,전종협 한국소음진동공학회 2023 한국소음진동공학회 논문집 Vol.33 No.5

During the launch process, the launch vehicle and satellite are affected by transient dynamic loads such as engine ignition, wind gusts, and quasi-static loads. Vibration tests are performed using a vibration facility to demonstrate that the spacecraft structure can withstand the loads of the launch environment. Especially in vertical vibration tests, as the spacecraft is larger and heavier, it has a higher center of gravity at the mounting surface. This configuration generates high overturning moments resulting in unwanted cross-axis motion. To perform the successful test by preventing over-test or under-test, it is essential to control excessive cross-axis movement. Hence, Korea Aerospace Research Institute (KARI) developed a triple shaker system with a guided head expander design and has performed successful tests for satellites since 2008. With the novel test requirements from the launch vehicle and satellite, KARI planned to upgrade the vertical vibration system. Here, the configuration of a novel vertical vibration shaker system is introduced to satisfy the requirements. Design factors for elements composing the shaker system, such as seismic mass, head expander, hydraulic supply unit, and safety control units, are described. Finally, the dynamic characteristics are predicted by applying the new shaker system’s finite element model.

단계유화중합에 의한 다중 core-shell 라디칼의 제조

임종민,설수덕,하선희 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2

마이크론 크기의 core-shell 라텍스는 음이온 계면활성제의 존재 하에서 MMA, St, BA의 단계 유화중합에 의해 합성되어진다. 첫 번째 단계인 core의 유화중합 시 단량체는 MMA, St, BA를 각각 사용하며 유화제는 농도가 높을 경우 shell 중합시 새로운 입자의 생성을 유발할 수 있으므로 중합 안정성이 있는 범위에서 유화제의 양을 최대한 억제하여 core입자를 제조하여야 한다. 그리고 두 번째 단계인 shell의 유화중합시 단량체는 PMMA core의 경우 BA, St을, PBA core의 경우 MMA, St을, PSt core의 경우 MMA, BA를 각각 사용하였으며, 관능기를 부여하기 위해 2-HEMA, AA, MAA를 사용한다. 또한 필름형성, 투과전자현미경에 의한 입자형태, 시차주사열량분석기에 의해 유리전이온도, 겔투과크로마토그래피에 의한 수 평균 및 중량 평균 분자량의 측정으로 core-shell 라텍스의 구조 및 입자형태 특성을 확인한다. 마지막으로 중합한 라텍스를 부직포에 함침시켜 건조온도에 따른 인장강도와 신율의 물성시 험으로 바인더로서 사용가능성을 고찰한다.

ITS2 염기서열 분석에 의한 감초 종(Glycyrrhiza spp.) 분류 및 유통 감초한약재의 원산지 판별

임종민,안영섭,박춘근,박충범,조준형 한국국제농업개발학회 2012 韓國國際農業開發學會誌 Vol.24 No.4

This study was conducted to identify the origines of Licorice (Glycyrrhiza spp.) traded as medicines in herb market. For these purpose, morphological characteristics and sequence of nrDNA and cpDNA among Glycyrrhiza spp. plants as follows; G. uralensis and G. glabra L. are used as medicines,however, Korean domestic G. pallidiflora is not used as medicine. In morphology, leaf and root shape among the plant were different. Especially, leaf shapes of G. uralensis and G. glabra L. were egg and oval shape, however, that of G. pallidiflora were lanceolate shape with higher leaf length/width ratio than other plants. An also in colors of the roots, white were shown in Chinese and Korean products, otherwise, off-white in Uzbekistan. In molecular studies of cpDNA, G. uralensis and G. glabra were not distinguished by rpoB2 and rpoC1 and only one SNP was shown by psbA-trnH. However, in 450 bp sequences amplified by ITS2, specific SNP were shown in 98, 99, 100 and 137, 161, 164, 203, 296 regions produced in G. glabra and G. pallidiflora, respectively. And these were presumably used as molecular markers for discriminating Glycyrrhiza spp.. Also in phylogenetic analysis, it was identified that the genetic relations between G. uralensis and G. glabra, which were used as medicines, were closer than to G. pallidiflora. By applying the results to traded herb materials, Chinese and Korean medicinal herbs are accordance with G. uralensis where as Uzbekistan medicinal herb is G. glabra. In results, molecular analysis by using ITS2was useful to identify the origines of medicinal herb, Glycyrrhiza spp. traded in herb market. 본 연구는 국내 유통 감초약재의 원산지 판별을 위해 수행되었다. 이를 위해 약재로 쓰이는 만주감초(Glycyrrhiza uralensis) 및 유럽감초(G. glabra)와 약재로 사용되지 않는 국내 자생종 개감초(G. pallidiflora) 식물의 형태적 차이 및 엽록체와 핵 DNA 구간의 염기서열의 차이를 구명하였다. 감초식물 3종의 형태적 특징을 비교한 결과, 잎과 뿌리에서 차이를 보였다. 특히 잎의 형태에 있어서 중국감초와 유럽감초는 난형 혹은 타원형인 반면, 개감초는 엽장/엽폭비가 큰 피침형이었다. 또한 건조된 뿌리로 시중되는 감초 한약재의 경우, 중국산과 한국산은 백색인 반면 우즈베키스탄산은 황백색이었다. 감초식물 3종을 대상으로 DNA 수준에서의 차이를 비교한 결과 rpoB2, rpoC1에서는 G. uralensis와 G. glabra가 구분되지 않았으며, psbA-trnH의 경우 단 한 구간의 SNP에서 차이를 보였다. 반면 ITS2에 의해 증폭된 450bp의 염기서열을 비교한 결과, G. glabra는 98, 99, 100번째 위치에서, G. pallidiflora는 137, 161, 164, 203, 296위치에서 감초 종간 판별을 위한 특이적 SNP가 확인되었다. 또한, phylogenetic tree 분석을 통해, 약재로 쓰이는 G. uralensis과 G. glabra는 약재로 쓰이지 않는 G. pallidiflora에 비하여 유전적 거리가가까움을 확인하였다. 본 표준시료에서 얻은 결과를 유통 한약재 원산지 판별에 적용한 결과, 중국산과 한국산의 한약재는 G. uralensis와 염기서열이 일치하였고, 우즈베키스탄으로부터 수입된 한약재는 G. glabra와 염기서열이 일치됨을 확인하였다. 이에 감초의 생체 및 한약재의 원산지 판별을 위해 ITS2를 이용한 분자수준에서의 판별이 유용하다고 판단된다.

2014년도 국내 전기재해통계분석을 통한 전기재해 예방요령

임종민 한국화재조사학회 2015 한국화재조사학회 학술대회 Vol.2015 No.11

종교 및 융복합적 특성이 사망양상에 미치는 영향

임종민,장주동,김현수,이무식 한국융합학회 2015 한국융합학회논문지 Vol.6 No.4

목적 : 재림교인들은 건강에 대한 신념이 매우 강하고, 실천적인 측면에서도 매우 강조하고 있다. 한국의 재림교인들 역시 음주와 흡연을 피할 뿐만 아니라 음식을 가려 먹고 육식을 금하는 기독교인으로 알려져 있다. 이 연구는 재림교인들의 사망양상과 일반 인구집단간의 사망양상을 파악하고 그 관련요인을 도출하고자 하였다. 방법 : 2000년부터 2004년까지 5년간의 재림교회와 일반 인구집단의 사망자의 사망양상을 비교 분석하였다. 재림교회의 사망자를 분석하기 위해서 수도권 지역의 재림교인이 주로 이용하는 재림묘지의 사망자 자료를 이용하였으며, 일반인구집단은 통계청 사망자료를 이용하였다. 결과 : 연구대상자의 평균 사망 연령에서 재림교인은 70.45세이었으며, 일반 인구집단은 65.63세로 재림교인이 높게 나타났다. 사망원인에서 재림교인이 위암, 간암, 대장암, 유방암 등 신생물에 의한 사망이 일반 인구집단 보다 높게 나타났으며, 일반 인구에서 손상, 중독 및 외인에 의한 특정 기타 결과, 뇌혈관질환과 외인사가 재림교인에서 보다 높았다. 특히, 50세 이상 신앙기간 10년 이상의 재림교인의 사망원인은 위암이 유의하게 낮았으며, 남자에서 폐암 사망률도 유의하게 낮아 건강한 생활습관과의 관계를 확인하였다. Objectives : Seventh-day Adventists is well known to place a strong doctrinal emphasis on healthy life style that do not consume tobacco, alcohol or pork, and many adhere to a lacto-ovo-vegetarian lifestyle. This study aimed to investigate the difference of mortality between Korean Seventh-day Adventists and the general Korean population. Methods : We got 592 mortality data of Adventist cemetery in Seoul city and Kyunggi provincce of Korea, which contains information on causes of death for 2000–2004. Also we used mortality data of the general Korean population in Korea National Statistics Office for 2000–2004. Results : The mean age at death was 70.45 in Korean Adventists, 65.63 in the general Korean population. Higher neoplasm cause of death, such as of stomach, liver and breast, were observed in Korean Adventists than the general population. The death cause of injury, poisoning and external causes, and cerebrovascular disease were higher in the general population than Korean Adventists. The death cause of stomach cancer was lower in Korean Adventists who had above 10 years religious period than general population above age 50 years. In male, the death cause of lung cancer was lower in Korean Adventists than the general population. Conclusions : The results point to the importance of healthy life-style in Korean peoples, and indicate that lifestyle changes in the population might change the causes of death.

ZnO 성장을 위한 Atomic Layer Deposition법에서 공정온도가 박막의 구조적 및 광학적 특성에 미치는 영향

임종민,이종무,Lim, Jong-Min,Lee, Chong-Mu 한국재료학회 2005 한국재료학회지 Vol.15 No.11

Atomic layer deposition (ALD) is a very promising deposition technique for ZnO thin films. However, there have been very few reports on ZnO grown by ALD. Effects of substrate temperature in both ALD and post annealing on the microstructure and PL properties of ZnO thin films were investigated using X-ray diffraction, photoluminescence, and scanning electron microscopy. The temperature window of ALD is found to be between $130-180^{\circ}C$. The growth rate of ZnO thin film increases as the substrate temperature increases in the temperature range except the temperature window. The crystal quality depends most strongly on the substrate temperature among all the growth parameters of ALD. The crystallinity of the film is improved by increasing the growth thine per ALD cycle or doing post-annealing treatment. The grain size of the film tends to increase and the grain shape tends to change from a worm-like longish shape to a round one as the annealing temperature increases from $600^{\circ}C\;to\;1,000^{\circ}C$.

만성 요통을 지닌 노인의 운동기능 재활을 위한 비침습 대뇌피질 전기자극의 이용가능성: 예비조사

임종민 대한스포츠물리치료학회 2020 정형스포츠물리치료학회지 Vol.16 No.1

Purpose: The purpose of this study is to investigate the effect of transcranial direct current stimulation (tDCS)over the dorsolateral prefrontal cortex (dlPFC) on pain intensity and functional strength in the elderly withchronic back pain. Methods: Sixteen elderly (72 ± 5.16 yrs) with chronic back pain participated in this randomized double-blindedcrossover study. Each participant received both sham and 2-mA anodal currents over left dlPFC (cathodeover the seventh cervical spinous process) for 20 min during 2 weeks for each current type with a washoutperiod of 2 days between two different current stimulation periods. Pain intensity, functional lift strength, andthe fear-avoidance response of all the participants were evaluated. Results: There were no significant differences in all pain-related variables between the 2mA stimulation periodand the sham stimulation period. However, for results by within-group analysis in each stimulation period,we found significant improvements in pain intensity (p=.02), functional strength, (p=.006) and fear-avoidanceresponse (p=.002) only after 2mA stimulation period, while there were no significant changes after shamstimulation. Conclusion: The current study demonstrated that anodal tDCS over dlPFC improve the painful feelings,followed by the functional strength for lifting task.

Carbonate 침전법을 이용한 α-알루미나의 나노파티클 코팅

임종민,김상우,Lim, Jong-Min,Kim, Sang-Woo 한국분말야금학회 2007 한국분말재료학회지 (KPMI) Vol.14 No.2

Nanocrystalline transient aluminas (${\gamma}$-alumina) were coated on core particles (${\gamma}$-alumina) by a carbonate precipitation and thermal-assisted combustion, which is environmentally friend. The ammonium aluminum carbonate hydroxide (AACH) as a precursor for coating of transient aluminas was produced from precipitation reaction of ammonium aluminum sulfate and ammonium hydrogen carbonate. The crystalline size and morphology of the synthetic, AACH, were greatly dependent on pH and temperature. AACH with a size of 5 nm was coated on the core alumina particle at pH 9. whereas rod shape and large agglomerates were coated at pH 8 and 11, respectively. The AACH was tightly bonded coated on the core particle due to formation of surface complexes by the adsorption of carbonates, hydroxyl and ammonia groups on the surface of the core alumina powder. The synthetic precursor successfully converted to amorphous- and ${\gamma}$-alumina phase at low temperature through decomposition of surface complexes and thermal-assisted phase transformation.

ZnO ALE를 위한 Si, sapphire기판의 ECR 플라즈마 전처리

임종민,신경철,이종무,Lim Jongmin,Shin Kyoungchul,Lee Chongmu 한국재료학회 2004 한국재료학회지 Vol.14 No.5

Recently ZnO epitaxial layers have been widely studied as a semiconductor material for optoelectronic devices. Sapphire and silicon are commonly selected as substrate materials for ZnO epitaxial growth. In this communication, we report the effect of the ECR plasma pretreatment of sapphire and silicon substrates on the nucleation in the ZnO ALE (atomic layer epitaxy). It was found that ECR plasma pretreatment reduces the incubation period of the ZnO nucleation. Oxygen ECR plasma enhances ZnO nucleation most effectively since it increases the hydroxyl group density at the substrate surface. The nucleation enhancing effect of the oxygen ECR plasma treatment is stronger on the sapphire substrate than on the silicon substrate since the saturation density of the hydroxyl group is lower at the sapphire surface than that at the silicon surface.

무릎 고주파 자극에 따른 넙다리네갈래근 및 뒤넙다리 근의 생리학적 변화: 연속 증례 연구

임종민,엄기매,김정진 대한스포츠물리치료학회 2019 정형스포츠물리치료학회지 Vol.15 No.1

Purpose: This study investigated the effects of the newly-developed high-frequency stimulation over knee on physiological characteristics of quadriceps (QM) and hamstring (HM) muscles. Methods: Ten healthy participants were participated in the study (average age: 49.3). Each participant received the high-frequency stimulation over both knees over three times a week during a total of two weeks. We measured the physiological characteristics of muscle tissue of QM and HM, including muscle tone (F), dynamic stiffness (S), and elasticity (D) by a Myoton device at pre and post-stimulation. Results: As a result, the elasticity of right HM was showed significant differences between pre- and post-stimulation (P=0.006). Conclusion: We conclude that the high-frequency stimulation over both knee may evoke the physiological changes in knee muscles.