• 한국운동역학회지
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• 제24권4호
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• pp.391-397
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• 2014

The purpose of this work is to biomechanically study the effect of the one leg standing pose in yoga.. The work have been done through the evaluation for the left and right symmetry ability of one leg standing pose in the before and after yoga training for the 14 female yoga subject group (height: $164.3{\pm}4.4cm$, mass: $53.4{\pm}6.4kg$, year: $20.0{\pm}0.49yrs$) participated in this experiment. The motions of one leg standing pose were captured with Vicon system and the parameters were calculated with Visual-3D and Ground reaction force system. The results were as followed; - Front and backward COPsd did not show the significant difference, compared the before training with the after. - Left and right COPsd showed the significant difference (p<0.05), compared the before training with the after. - COP distance showed the significant difference (p<0.01), compared the before training with the after. - The asymmetry index of front and backward COPsd did not show the significant difference, compared the before training with the after. - The asymmetry index of left and right COPsd did not show the significant difference, compared the before training with the after. - The asymmetry index of COP distance showed the significant difference (p<0.01), compared the before training with the after. Therefore, the yoga training demonstrated the stable improvement in the one leg standing pose of inferior feet and the positive effect to the left and right symmetry ability.

• 공업화학
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• 제25권5호
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• pp.474-480
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• 2014

본 연구에서는, $Mn/TiO_2$ 촉매를 이용하여 일산화질소의 산화반응 특성에 따른 연구가 수행되었다. $TiO_2$의 물리 화학적 특징 및 활성금속인 Mn과 담체인 $TiO_2$의 interaction에 따라 일산화질소의 산화반응이 서로 다르게 나타남을 관찰하였다. 우수한 NO oxidation 반응을 나타낸 $Mn/TiO_2(A)$의 경우, Mn의 함량이 10 wt%에서 30 wt%로 증가할수록, 공간속도가 낮아질수록, 반응활성이 증가함을 확인하였다. 이러한 결과를 바탕으로 SCR 전단에 $Mn/TiO_2$ 촉매를 사용함으로써, fast-SCR을 유도하여 SCR반응활성이 증진될 수 있을 것으로 판단된다.

• 한국운동역학회지
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• 제25권4호
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• pp.489-498
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• 2015

Objective : The purpose of this study was to analyze the effects of the windlass mechanism in trail-walking shoe prototypes that can effectively support arches. A study of these effects should help with the development of a first-rate trail-walking shoe development guide for the distribution of quality information to consumers. Methods : The subjects were ten adult males who volunteered to participate in the study. Shoes from three companies, which will be referred to as Company S (Type A), Company M (Type B), and Company P (Type C), were selected for the experiment. The subjects wore these shoes and walked at a speed of 4.2 km/h, and as they tested each shoe, the contact area, maximum pressure average, and surface force were all measured. Results : Shoe Type A showed a contact area of $148.78{\pm}4.31cm^2$, Type B showed an area of $145.74{\pm}4.1cm^2$, and Type C showed an area of $143.37{\pm}4.57cm^2$ (p<.01). Shoe Type A demonstrated a maximum average pressure of $80.80{\pm}9.92kPa$, Type B an average of $85.72{\pm}11.01kPa$, and Type C an average of $89.12{\pm}10.88bkPa$ (p<.05). Shoe Type A showed a ground reaction force of $1.13{\pm}0.06%BW$, Type B a force of $1.16{\pm}0.04%BW$, and Type C a force of $1.16{\pm}0.03%BW$ (p<.05). Conclusion : The Type A trail-walking shoe, which was designed with a wide arch from the center of the forefoot to the front of the rearfoot showed excellent performance, however, more development and analysis of the windlass mechanism for a variety of arch structures is still necessary.

• 한국수소및신에너지학회논문집
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• 제31권1호
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• pp.82-88
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• 2020

Recently, a fuel reforming plant for supplying high purity hydrogen has been studied to increase the operation time of underwater weapon systems. Since steam reforming is an endothermic reaction, it is necessary to continuously supply heat to the reactor. A fuel reforming plant needs a methanol-O₂ catalytic burner to obtain heat and supply heat to the reformer. In this study, two types of designs of a catalytic burner are presented and the results are analyzed through the experiments. The design of the catalytic burner is divided into that the O₂ supply direction is perpendicular to the methanol flow direction (Design 1) and the same as the methanol flow direction (Design 2). In case of Design 1, backfire and flame combustion occurred in the mixing space in front of the catalyst, and in the absence of the mixing space, combustion reaction occurred only in a part of the catalyst. For above reasons, Design 1 could not increase the exhaust gas temperature to 750℃. In Design 2, no flashback and flame combustion were observed, the exhaust gas could be maintained up to 750℃. However, the O₂ distributor was exposed to high temperatures, resulting in thermal damage.

• 한국운동역학회지
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• 제25권1호
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• pp.85-94
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• 2015

Purpose : The purpose of this study was to investigate the influence on the ground reaction force parameters according to wearing positions of backpack for during stair ascending and descending. Methods : Participants selected as subject were consisted of young female(n=10) and performed stairs walks(ascending and descending) with 2 types of wearing position(front of trunk[FT], rear of trunk[RT]). Passive(Fz 1) and active(Fz 2) forces of the vertical GRF were determined from time function and frequency domain. Also shear forces(Fx, Fy 1, Fy 2), dynamic postural stability index(MLSI, APSI, VSI, DPSI), loading rate and center of pressure (${\Delta}COPx$, ${\Delta}COPy$, COP area) were calculated from time function and frequency domain. Results : Fx, Fy 1, Fy 2, and Fz 1 in GRF didn't show significant differences statistically according to the wearing positions of backpack(p>.05), but stair descending showed higher forces than that of stair ascending. Particularly, Fz 2 of stair ascending showed higher forces than that of stair descending(p<.001), RT types showed higher than that of FT types(p<.05). MLSI, APSI, VSI, and DPSI of stair descending showed the increased stability index than that of stair ascending(p<.05), MLSI of RT types showed the decreased stability index than that of FT types(p<.05). Loading rate didn't show significant differences statistically according to the wearing positions of backpack(p>.05), but stair descending showed higher loading rate than that of stair ascending(p<.001). Also, ${\Delta}COPx$ in stair descending showed the increased movement than that of stair ascending(p<.05). Conclusions : A backpack of 10 kg(10 kg(ratio of body weights $17.61{\pm}1.17%$) showed significantly change GRF parameters according to wearing positions during stair ascending and descending. If possible, we suggest that the dynamic stability, in case of stairs walking with a smaller weights can be further improved.

• 한국응용곤충학회지
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• 제1권
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• pp.37-41
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• 1962

1. 시험은 1961과 1962년의 2개년에 걸쳐 대관령에서 미국, 일본, 독일계와 한국재래품종 53품종을 공시하여 감자역병에 대한 저항성을 조사할 것이다. 2. 본시험은 자연발병하에서 조사하였으며 항저성의 차이를 다섯 계급으로 구분하였는데 그 결과는 아래와 같다. 면역성품종...Kennebec, Isola, Cherokee, Merrimack, Yoraku, Lisili, Cosima. 고도저항성품종...Antze, Ragis Isola, Delus, Hessenkrone, Plymouth, Sebago, Pungo, Sieglinde, Anco, Essex. 저항성품종...Tawa, B-605-10, Sequoia, Grata, Concordia, Onaway, Noring 1, Nisego. 이병성품종...Nordak, Pontiac, Benimaru, Early gem, Chippewa, Chitose, Ohjiro, Red Bake, Norland, Katahdin. 고도이병성품종...Russet Burbunk, May Queen, Earlaine, Irish Cobbler, Feldeslohn, Red Warba, Chisago, Osseo, Paunee, Warba, Norgleam, Red Beauty, Red, Danshaku, Namchak(Native variety). 3. 만생종품종이 조생종보다 저항성이었다. 4. 일본계와 미국계도입품종보자 독일계도입품종이 저항성이 강한 편이었다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.1116-1121
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• 2004

In this study, the effect of central fuel injection on a coaxial laminar $CH_{4}/air$ flame was experimented at the defined premixing condition(${\Phi}=1.90$, ${\sigma}=50/75/100%$, x/D=10). The partial premixing parameter are the equivalence ratio that total fuel is fixed at 200cc/min, the fuel split degree which means the percentage of fuel entering the outer tube to the total amount, and the mixing distance indicating the nonreactant mixture's homogeneity between inner tube top and burner exit. The object is to investigate the flame structure and chemiluminescence characteristics of laminar partial premixed flame as changing mixing parameters. The radical signal was acquired from ICCD camera and PMT. Each intensity was compared with Abel inverted value for measuring the effect of background light on the peak signal location and the intensity at central preheat zone. The results show that the peak location of each radical was broaden as the fuel split degree increasing because the mixing quality was enhanced. and $OH^{\ast}$ is a good indicator for flame front between reaction and preheat zone. At last $CH_{2}^{\ast}$ has the same tendency with $CH^{\ast}$ but a thinner reaction zone than $CH^{\ast}$ due to a rapid decay on the burned gas side.

• 대한한의학회지
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• 제21권3호
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• pp.3-8
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• 2000

1. Definition : Bee-venom therapy does not involve actual bee-stings: it is a treatment method with acquired bee-venom extract through the electric stimulus on the bee, It is injected subcutaneusly on the acupuncture point after refining, according to the diagnosis of constitution and disease. 2. History : Around 2000 B.C., records that Bee-venom was used for therapy were written in the medical book of Babylonia and Papirus of ancient Egypt. Hippocrates, who is called the father of Medicine, said that Bee-venom is Arcanum, which means mysteric medicine. In Oriental medicine, B.C. 200, there was a clinical record that the meat suspended in front of the bee house on the tree in order to get bee-venom, was attached on the lesion. 3. Mechanism of Action : There are two aspects: 1) The effect of stimulating acupunture point It is similar to the chemical moxa. I think that there are several methods of stimulating the acupuncture point： For example, a simple needle is a mechanical stimulus, Moxa is a heating stimulus and electric and Raser acupunture etc. And another stimulus: in the ancient orient, a chemical stimulus called Chungu(Tianjiu), is attached to the lesions by using grinded insects (ex. Mylaris phalerate PALL.) which have toxin. So Bee venom therapy is similar to this. 2) The effect of biochemical ingredients Bee venom consists of 40 kinds of ingredients. For example, me Iii tin, Apamin, Pospholipase A2, MCD peptide, Adolapin and so on. They have effects which have been proven through experimentation l) tonifying mechanism of the body through increasing hormon secretion 2) tonifying immune system through proliferation of WBC, lymphocytes, macrophage 3) anti-inflammatory reaction Therefore Bee venom therapy is the representative 3rd Medicine, which combined East & West medicine. 4. Application of disease : L.B.P and HIVD, O.A, R.A, degenerative arthritis, shoulder pain and other pain diseases. 5. Therapic methods : According to constitution and disease, proper concentration of bee venom is injected on acupunture point, 2 times a week. Generally one term is consisted of 15times. 6. Contraindication : Heart disease, TBc, DM, kidney disease(nephritis), pregnancy, woman in menstruation 3-4 persons per 100,000 persons may have severe allergic reaction.

• KSBB Journal
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• 제14권3호
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• pp.358-364
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• 1999

참나무의 전처리에 과산화수소가 미치는 영향을 조사하였다. 반응온도는 $170^{\circ}C$이고 전처리에 사용된 반응용액은 암모니아, 황산 그리고 순수 물이었다.10% 암모니아용액을 사용한 경우 산을 사용하는 경우에 비해 리그닌 제거율은 55%로 상당히 높았지만 헤미셀룰로오스 회수율은 26%로 상당히 낮았다. 그래서 헤미셀룰로오스 회수율을 높이기 위해 암모니아 용액에 산화제인 과산화수소를 첨가하여 반응시켰는데 과산화수소 첨가량의 증가에 따라 리그닌 제거율과 헤미셀룰로오스 회수율의 증가는 크지 않았다. 그리고 과산화수소 첨가량의 증가에 따라 액상으로 용해된 당의 분해가 증가하여 전체 헤미셀룰로오스와 셀룰로오스의 물질수지에 문제가 있었다. 반응기에 주입된 과산화수소는 주로 반응기의 전반부에 충진된 기질과 반응하는 것으로 나타났다. 헤미셀룰로오스 회수율을 높이기 위해서는 알카리용액보다 산성용액에서 기질을 전처리하는 것이 필요하였고 산보다는 물을 사용하였을 때 과산화수소의 효과가 더 컸다.

• 한국운동역학회지
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• 제19권4호
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• pp.749-759
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• 2009

본 연구는 정구 남자 국가대표 전위선수 4명($33.3{\pm}2.16$세)을 대상으로 포핸드 미들발리에 대한 운동학적, 운동역학적 분석을 통하여 기초 자료를 제공하는데 있다. 분석결과, 스윙시간은 1구간이 64.7%로 가장 길게 나타났고, 인체중심의 이동변위는 1구간에서 오른쪽으로 48.1%, 전방으로 54.4%를 차지하였다. 임팩트 시 팔꿈치 관절의 속도와 상완분절의 각속도에서 각각 평균 3.67m/s와 201deg/s로 가장 빠르게 나타났으며, 이는 네트 위에서 임팩트 되도록 하기 위해 팔을 빠르게 신전시켰기 때문이라 사료된다. 이때의 팔꿈치 각도와 볼 속도는 각각 평균 $149^{\circ}$와 18.9m/s이였다. 지면반력에 있어서 왼발과 오른발의 X와 Y방향의 분력에서 통계적으로 유의한 차이가 나타났으며, 이는 왼발이 오른쪽으로 밀 때 오른발은 그 힘에 대칭적으로 비례하여 왼쪽 방향으로 지지대 역할을 한 것으로 사료된다.