31,707 research outputs found
원통형 마이크로 프로브 제조를 위한 전기 화학적 가공 공정
No full textDisclosed is an electrochemical machining process for fabrication of cylindrical microprobes, which is effected by the tool acting as the cathode against the workpiece acting as the anode, taking advantage of a chemical reaction occurring between the workpiece and the tool, both being beneath the surface of an electrolyte, under such a controlled electric field that the workpiece can be machined to have a uniform diameter throughout its entire length. The electrochemical machining can be carried out with greater precision because a precise machining process because the volume to be additionally processed owing to the surface tension generated when the workpiece is dipped into the electrolyte is taken into consideration
전류 밀도 제어 기술을 사용한 전기 화학적 공정
No full textAn electrochemical process using current density controlling techniques is disclosed. In the electrochemical process of this invention, a carbon cathode rod activated with a negative voltage and an electrode activated with a positive voltage are sunk into an electrolyte contained in a container, and so the electrode is electrochemically etched while properly controlling both the metal ion dissolving rate and the metal ion diffusing rate of the electrode by controlling the amount of applied current to maintain the two rates at a desired balance. This process thus creates a diffusion effect thickening the tip of the cylindrical electrode, and compensates for a conventional geometric effect sharpening the tip of the electrode. Therefore, this process produces a precise product having a uniform diameter along its length. In the electrochemical process of this invention, the electrode is ultrasonically washed on its surface with both acetone and distilled water before the process so as to remove impurities from the surface of the electrode. In addition, the electrolyte is a potassium hydroxide solution having a molar density of 402dc#6 M
전기 화학 방전 가공 장치와 가공 방법
No full textAn electrochemical discharge machining method may include electrolytically machining a tool fed by a three-dimensional tool feeder which can accurately feed a tool in three dimensions. The electrolytic machining may be performed in a current controlled mode, during which a concentration and a height of an electrolyte may be regulated. Further, the method may include performing electrochemical discharge machining of the workpiece using the machined tool in a voltage controlled mode
On Campus Video, featuring Taekwondo Master Young Sun Lim and one of his students, Christopher Speck.
No full textA videorecording of an interview with Taekwondo Master Young Sun Lim and one of his students, Christopher Speck, conducted by Dr. Gary McCaleb of Abilene Christian University
Epanerchodus gangwonus Mikhaljova & Lim 2002
No full textEpanerchodus gangwonus Mikhaljova & Lim, 2002 Epanerchodus gangwonus Mikhaljova & Lim, 2002: 19 –21, 20: figs 1–8. Remarks. Originally described from Gangwon-do, South Korea (Mikhaljova & Lim, 2001), this species has since never been rediscovered. Distribution. South Korea.Published as part of M, E L E N A V., Va, I K H A L J O & Lim, Kil-Young, 2006, The millipede genus Epanerchodus Attems, 1901 in the Korean Peninsula, with a description of a new species (Diplopoda, Polydesmida, Polydesmidae), pp. 45-53 in Zootaxa 1350 on page 48, DOI: 10.5281/zenodo.17451
Lim, Young Bum
No full text학위논문(석사)----아주대학교 교육대학원 :TESOL,2013. 8Chapter 1 Introduction 1
Chapter 2 Literature Review
2.1 The benefits of corpus-based learning
2.2 The benefits of data driven learning
2.3 Inductive and deductive concordance activities
2.4 Learner as language researcher
Chapter 3 Method
3.1 Participants
3.2 Material
3.2.1 Paper-based DDL material
3.2.2 Concordance resources
3.3 Procedure
3.3.1 Data collection
3.3.2 Data analysis
Chapter 4 Results
4.1 Students' inductive language learning through concordance tasks
4.2 The process of students' inductive thinking skills use
4.3 Different rates of inductive thinking skills use between two groups
Chapter 5 Conclusion
5.1 The overall process of the study
5.2 Pedagogical implications
5.3 Limitations
References
Appendices
Appendix 1: Proficient group students’ cognitive skills use
Appendix 2: Intermediate group students’ cognitive skills use
Appendix 3: Concordance Task (worksheet)MasterThis study was designed to investigate the process of improving the inductive thinking strategies of Korean high school students while using paper-based concordancing materials. The study was conducted over a two-month period with 40 male high school students at a boys’ high school located in Kyounggi Province, South Korea; the students were 3rd-year students 18 to 19 years old. According to their English scores on the 2012 National Assessment of Educational Achievement, participants were divided into 2 groups: 20 Proficient group students and 20 Intermediate group students. They completed concordance tasks three times. By using the Corpus of Contemporary American English (COCA), the researcher created three paper-based concordance tasks. Each participant’s report was analyzed qualitatively by adopting Chun’s (2011) descriptions on learners’ types of cognitive skills. Participants’ reports were also supplemented with other sources such as interviews and observation notes.
The results showed that high school students were developing different cognitive skills over the course of the three tasks. However, the improvement rate of their inductive thinking skills differed depending on their language proficiency. Thus, a corpus-based approach might be used as a new method of teaching for improving the inductive thinking skills of high school students. However, students’ proficiency levels should be carefully considered when such an approach is used.
The present study had some limitations. The number of tasks and the duration of the experiment may have not been sufficient to observe students’ cognitive skills improve, especially for the intermediate-level students. In addition, there was no survey to check the degree of participants’ satisfaction, difficulties and opinions. Lastly, it is not wise to generalize results from participants who were exposed to only one type of paper-based material. Further research will need different types of concordance tasks with which these results may be compared
Young Jin Lim
No full text학위논문(석사)--아주대학교 산업대학원 :화학공학과,2011. 2플라스틱은 오늘날 우리 일상생활에서 필요한 소재로 생활하는데 없어면 불편함을 느낄정도로 없어서는 안될 소재로 그 범위는 점차 넓혀 가고 있 어며 우수한 성질 때문에 다양한 산업에 소재에 활용되었어나 플라스틱의 분해되지 않는 성질로 인해서 환경문제를 일으키고 있다.
이러한 문제를 해결하고자 각국에서 연구서, 산업협력을 통해서 친환경 소 재의 플라스틱도 개발을 하기 시작하고, 학문으로 부각 하기 시작 했다.
분해성 플라스틱에는 생붕괴성 플라스틱, 광분해성 플라스틱, 생분해성 플 라스틱으로 나누어지는데, 생분해성 플라스틱 종류에는 천연고분자, 미생물 합성계고분자, 합성계 고분자, 광∙생분해고분자가 있어며 각 국가에서 다양 한 연구를 진행되고 있다.
그러나 여러산업에서는 친환경 소재를 이용할려는 노력이 있어나 의료기기 인 Non PVC Bag 링겔은 PVC 소재를 사용하다가 PVC가 인체가 유해해 서 Non PVC (PP)로 전환한 이후 다른 다양한 소재가 플라스틱을 분해하 는 연구가 진행하고 있지만, 현재 의료기기인 Non PVC Bag은 그 이후 개 발은 미비하고 그 자료가 충분히 하지 못해 생분해성 플라스틱에 전반으로 설명하고 있다.
앞으로 Non PVC Bag도 제조업도 환경에 대한 문제를 인식하여
환경 및 연구에 관심을 가질것으로 기대한다.제 1장 서론 4
제 2장 본론 5
1. 생분해성 플라스틱 동향 및 전망 5
1). 연구 개발 배경 5
2). 전망 5
2. 생분해성 종류 및 분해경로 및 합성 9
1. 생분해성 플라스틱 종류 9
1). 천연 고분자 9
2). 미생물 합성계 고분자 10
3). 합성계 고분자 10
4). 광 생분해 고분자 11
2. 생분해성 플라스틱의 분해 경로 12
3. 생분해성 지방족 폴리에스테르 화학구조 및 특성 13
3장 결론 20
4장 참고문헌 20Maste
Hyleoglomeris unicolorata Lim, sp. n.
No full textHyleoglomeris unicolorata Lim, sp. n. Figs 1–6. Material examined Holotype: 1 male (ChNU), from Goyang, Gyeonggido, South Korea, collected 17 May 1991 by K.Y. Lim. Paratypes: 1 male, 2 females (ChNU), same locality as for holotype, collected 17 May 1991 by K.Y. Lim. Diagnosis. Differs from congeners mainly by the monochrome coloration without any pattern, combined with the ovoid syncoxital lobe of the telopods and syncoxital lateral horn crowned with wrinkles and a subapical setoid. Etymology The specific epithet refers to the monochrome coloration of the body. Description Male. Length 7.5 –8.0 mm, width 4.0– 4.5 mm. Body coloration in alcohol light tan, without any pattern of spots and stripes. Clypeus light tan. Antennae light tan with distal antennomeres brownish tan. Ocelli tan. Tömösváry’s organ light tan. Venter somewhat lighter than dorsum. Legs light tan. Ocelli convex. Holotype with 8 + 1 ocelli on each side of head. Paratype with 7 + 1 ocelli on right side and 8 + 1 ocelli on left side of head. Antennomere 6 about 2.1–2.2 times longer than wide. Dorsum smooth. Collum with two transverse striae. Thoracic shield with a narrow hyposchism reaching but not protruding beyond hind tergal contour, with 8 delicate striae, of which only four entirely crossing dorsum (Fig. 1). Some of the striae with branch. Length of striae varied. As usual, anterior border of the thoracic shield with one stria concealed under caudal margin of collum. Pigidium delicately sinuate medially at caudal margin. Leg pair 17 (Fig. 2) with high, regularly rounded, outer coxal lobes, telopodite 4 –jointed. Leg pair 18 (Fig. 3) with a lancetshaped syncoxital notch, telopodite 4 jointed, basal segment with sparsely papillate laterally. Telopods (Fig. 4) massive; central lobe of syncoxite rather large, ovoid, microsetose, with a low and smooth prominence frontally and a shagreen shallow cavity caudally. Syncoxital lateral horns high, slender, setose, directed caudad, each crowned with wrinkles and a subapical setoid (Fig. 5). Both prefemur and femur micropapillate laterally and mesally. Prefemur with a long, inner, setose finger crowned with a long flagelloid. Femur with a similar but shorter, anteromesal, setose finger also crowned by a flagelloid and posteriorly with a large inner outgrowth apically bearing a membranous sack curved forward. Caudomedial outgrowth of femur relatively narrow at base (Fig. 6). Tibia with a long anteromedial seta, with a curved dentiform medial outgrowth posteriorly. Caudomedial outgrowth of tibia with a weakly micropapillate tubercle at base. Tarsus with a somewhat curved caudad distal part and a strong subapical seta. Female. Length 9.5 –10.0 mm, width 5.0– 5.5 mm. Ocelli 7 + 1 to 8 + 1. Antennomere 6 about 2.2–2.3 times longer than wide. Pigidium very slightly sinuate medially at caudal margin. One paratype with hyposchism somewhat protruding beyond hind tergal contour.Published as part of Mikhaljova, Elena V. & Lim, Kil-Young, 2006, New species of the genus Hyleoglomeris from Korea (Diplopoda: Glomerida: Glomeridae), pp. 45-58 in Zootaxa 1224 on pages 46-47, DOI: 10.5281/zenodo.17263
Hyleoglomeris confragosa Mikhaljova & Lim, sp. n.
No full textHyleoglomeris confragosa Mikhaljova & Lim, sp. n. Figs 22–29. Material examined Holotype: 1 male (ChNU) from Jeongok, Yeonchongun, Gyeongido, South Korea, collected 17 May 1991 by K.Y. Lim. Parartype: 1 female (ChNU), same locality as for holotype, collected 17 May 1991 by K.Y. Lim. Diagnosis Differs from congeners mainly by the thoracic coloration pattern of the anterior whiteyellowish transverse band and pair of marbled brown oblong lateral spots, combined with the oval, vertically stretched syncoxital lobe of the telopods, the very high telopod syncoxital horns without apical modifications, the strongly curved anteriad caudotibial outgrowths of the telopods, the irregularly rounded edge of the small coxal lobe of the male leg pair 17. Description Male. Length 5.5 mm, width 2.9 mm. Background coloration of head brown with several small light spots between and above antennal sockets; clypeus, labrum and Tömösváry’s organs yellow. Ocelli black. Antennae darkbrown; antennal sockets yellow. Dorsum brown. Collum with a large oval marbled brown central spot (Fig. 22). Thoracic shield with a whiteyellowish transverse band occupying its anterior striate portion; pair of marbled brown oblong spots placed laterally (Fig. 23). Each following tergite with pair of marbled brown oblong lateral spots and a translucid caudal margin (Fig. 24). Hidden anterior portion of tergite marbled brown. Pigidium brown with lucid caudal margin and without any pattern. Venter, legs and telopods yellowish. Ocelli convex, 6 + 1 on each side of head. Antennomere 6 about 2.0 time longer than wide. Dorsum smooth. Collum semicircular, with two transverse striae. Thoracic shield with 9 delicate striae of which only three entirely crossing dorsum, with a relatively narrow hyposchism reaching but not protruding beyond caudal tergal margin. Anterolateral corners of hyposchism lobeshaped and protruding anteriad (Fig. 23). Length of stria varied. A broad hollow occupying 4 striae placed between schism and hyposchism laterally. As usual, anterior border of thoracic shield with one stria concealed under caudal margin of collum. Pigidium delicately sinuate medially at caudal margin. Leg pair 17 (Fig. 25) with small and irregularly rounded outer coxal lobes, telopodite 4 segmented with three claws apically. Leg pair 18 (Fig. 26) with a lancetshaped syncoxital notch; telopodite 4 segmented. Telopods (Fig. 27) with a relatively small, thick, oval, vertically stretched, microsetose central syncoxital lobe. Surface of syncoxital lobe with a low smooth prominence frontally and shagreen shallow cavity caudally. Syncoxital lateral horns very high, slender, covered with setae proximally. Distal portion of syncoxital horn without visible modifications, excluding tiny wrinkles (Fig. 28). Prefemur micropapillate laterally and somewhat mesally, with a long inner setose finger crowned with a long flagelloid. Femur with a shorter anteromesal setose finger also crowned with a flagelloid and posteriorly with a large inner outgrowth apically bearing a membranous sack curved forward. Caudomedial outgrowth of femur wide at base (Fig. 29). Tibia with a long anteromedial seta, posteriorly with medial outgrowth strongly curved anteriad. Caudomedial outgrowth of tibia bearing a micropapillate tubercle. Tarsus with a strongly curved caudad distal part and a subapical seta. Female. Length 7.0 mm, width 3.0 mm. Pigidium regularly margined. Ocelli 6 + 1 on each side of head. Thoracic shield with 10 delicate striae on left side and 11 such striae on right side, of which only three entirely crossing dorsum. Length of the striae varied. A broad hollow occupying 4 striae placed between schism and hyposchism. Remarks A restudy of the above material proves that Mikhaljova & Lim (2000) misidentified Hyleoglomeris confragosa sp. n. specimens (male and female) from Gyeongido, South Korea as belonging to H. koreana.Published as part of Mikhaljova, Elena V. & Lim, Kil-Young, 2006, New species of the genus Hyleoglomeris from Korea (Diplopoda: Glomerida: Glomeridae), pp. 45-58 in Zootaxa 1224 on pages 52-54, DOI: 10.5281/zenodo.17263
Single skeletal muscle fiber mechanical properties: a muscle quality biomarker of human aging
No full text© 2022, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Skeletal muscle strength, mass, and function should be carefully monitored for signs of decline with advanced adult age. An understanding of the pathophysiology and severity of sarcopenia can be improved with the exploration of changes in muscle fiber properties. Furthermore, although functional decline with increase age is a well-known phenomenon, the mechanisms underlying this decline, and the features that characterize it, are complex and variable. The age-related decline of muscle function is a result of not only a decrease of muscle mass but also a decline in the intrinsic properties of muscle fibers that are independent of size. We believe it is important to understand changes in muscle quality (force adjusted for size), and not to focus solely on muscle mass, because muscle quality is closely related to measurements of function and could potentially predict clinical outcomes such as morbidity, disability, and mortality. Neurological and metabolic mechanisms contribute to muscle quality, but the intrinsic properties of muscle cells are central to the maintenance of force-generating capacity. Muscle quality can be evaluated with the assessment of morphological, physiological, and mechanical properties in single permeabilized or skinned fibers. This approach excludes the influence of the nervous system, tendons, and the extracellular matrix. In this review, we summarized the changes in active and passive mechanical properties at the single muscle cell level in older skeletal muscles. We argue that intrinsic mechanical changes in human single muscle fibers are useful biomarkers and indicators of muscle quality.N
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