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차인호 사단법인 한국브랜드디자인학회 2019 브랜드디자인학연구 Vol.17 No.1
These days, systematic lighting design has been required for comfort of the space, unlike past the lighting has been focused on the purpose of illuminating darkness or electric efficiency because at that time we think lighting system was only for darkness. 72% of the customers complain that the color of the cosmetics differs after purchasing. This problem is due to the lack of color rendering for reproduction of colors in store showcase. However, high color rendering lighting equipment has been avoided because of price. This study aims to present a environment that can replace high-priced color rendering lighting system, based on the relationship between level of illumination and color temperature. We measure the level of illumination and color temperature of the 20 cosmetics stores and organize the calculated data. And make customer interviews to find out suitable environment in visual perception. High color rendering property close to nature was secured in 4800Lx and 5500 K. With the lighting environment of the optimum level of illumination and color temperature conditions, concrete design methodology can be realized and applied, especially in general commercial space where is hard to be applied high quality color rendering system because of high price. And also in costume room, design office, museum can be operated in low cost. 조명을 단순히 어두움을 밝히는 목적으로만 인식하여 전기에너지적 효율이나 밝기감 확보에만 집중했던 과거와 달리 공간의 질적 쾌적함을 위한 빛의 체계적 설계가 요구되고 있다. 72%의 고객이 화장품 매장에서 구매한 색조화장품의 색상이 구매이후 달라보여서 불편함을 겪었다고 호소한다. 이 같은 문제는 화장품매장의 색조화장품 쇼케이스의 피부착색테스트용 조명환경에 원색재현을 위한 연색성이 절대적으로 부족하기 때문이다. 하지만 고연색성 조명장비는 높은 가격으로 매장의 관리자나 점주입장에서 적용을 기피하고 있다. 이 연구는 조도와 색온도의 관계성에 의거하여 고가의 고연색성 조명을 대신할 수 있는 빛의 환경을 제시하고자 한다. 이를 위해 서울도심과 부도심의 화장품매장 20곳에 대한 조명환경의 문제를 유형화하였으며 조도와 색온도를 측광하여 산출된 자료를 정리하고, 그 수치에 대한 검증절차로 방문고객을 대상으로 FGI를 실시하여 시지각 인지의 관점에서 적합한 조명조건을 규명하였다. 그 결과, 조도 4800Lx, 색온도 5500 K 의 조건에서 자연광조건에 가까운 높은 연색성을 확보할 수 있었고 매장방문 고객을 대상으로 한 평가조사에서도 이 조건의 연색적정성이 가장 높게 평가되었다. 이 연구를 통해 밝혀진 적정 조도와 색온도조건의 조명환경으로 고연색성 조명장비가 필요하지만 높은 가격 때문에 적용하기 힘들었던 일반 상업공간을 비롯하여 의상실, 디자인사무실, 저예산으로 운영되는 미술관, 박물관, 전시관에서도 합리적 비용으로 쾌적한 시각적 인지환경을 연출할 수 있는 구체적 설계방법론을 구현하고 응용할 수 있게 될 것으로 기대한다.
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전문 볼링선수들의 투구 시 볼의 분당 회전수 수준이 등속성 근기능과 경기력에 미치는 영향
차인호,조인호 한국스포츠학회 2022 한국스포츠학회지 Vol.20 No.1
The purpose of this study was to explore the effect on isokinetic muscle function and performance according to the level of Revolutions Per Minute (RPM) during bowling pitching for male professional ten-pin bowlers. For this, we experimented with 14 professional ten-pin bowlers over the age of 20. We measured the average value of RPM during bowling pitches in 4 games. We conducted isokinetic muscle function tests by splitting into a high RPM group and a low RPM group based on the median split-half method. The collected data was analyzed using SPSS 23.0, and the difference between each group was analyzed by applying an independent t-test. The results of the study are as follows. First, there was a statistically significant difference between the groups in the knee peak torque at 180°/sec and 240°/sec Flexor BW(R). Also, there was a statistically significant difference between the groups in the waist peak torque at 60°/sec, 180°/sec, and 240°/sec Extensor BW. Lastly, there was no statistically significant difference between the groups in the scoring according to RPM level. 본 연구는 남자 전문 볼링선수를 대상으로 볼링 투구 시 볼의 분당 회전수(Revolutions Per Minute, [RPM]) 수준이 등속성 근기능과 경기력에 미치는 영향을 탐색하기 위한 목적으로 진행되었다. 이러한 목적에 따라 20세 이상의 전문 볼링선수 14명을 대상으로 연구를 진행하였다, 4게임의 볼링 투구에서의 볼의 분당 회전수의 평균값을 측정하였으며, 중앙치 반분법을 준거로 분당 회전수 상위집단(High RPM Group)과 분당 회전수 하위집단(Low RPM Group)으로 집단 편성하여, 등속성 근기능 검사를 실시하였다. 수집된 자료는 SPSS 23.0을 이용하여 분석하였으며, 각 집단 간에 차이는 독립 t검정을 적용하여 분석한 연구결과는 다음과 같다. 첫째, 볼링 투구 시 분당 회전수 수준에 따른 전문 볼링 선수들의 무릎 최대우력의 차이는 180°/sec, 240°/sec Flexor BW(R)에서 집단 간에 통계적으로 유의한 차이가 나타났다. 둘째, 등속성 허리 최대 우력 차이는 60°/sec, 180°/sec, 240°/sec Extensor BW에서 집단 간에 통계적으로 유의한 차이가 나타났다. 셋째, 볼링 투구 시 RPM에 따른 점수 기록의 차이에서 통계적으로 유의한 차이가 나타나지 않았다.
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차인호,김용환,Cha, In-ho,Kim, Yong-hwan 대한수의학회 1996 대한수의학회지 Vol.36 No.2
The objects of the present study were to establish the method of purification, subunit dissociation of verotoxin-2 (VT2) produced by Escherichia coli O157:H7, and to investigate the characteristics of purified verotoxin-2 such as molecular weight and composition of amino acid. The results were summerized as follows; Verotoxin-2 was extracted by addition of polymyxin B sulfate into bacterial cell lysate prepared from Escherichia coli O157:H7(KSC109). As an initial step, the bacterial cell lysate was precipitated with 30% saturated ammonium sulfate. The precipitated crude toxin was then subjected to anion-exchange, chromatofocusing and cation-exchange chromatography. Using this scheme, we obtained highly purified toxin with a specific activity of $1.1{\times}10^9$ $CD_{50}/mg$. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE) for purified VT2 showed two protein bands. The upper band, approximately 32 Kd, was supposed as A subunit and the lower band, approximately 7.7 Kd, was supposed as B subunit. When the toxin was separated in the subunit-dissociating solution, two peaks emerged with retention times of 15 and 28 min by HPLC. These peaks represented A subunit and B subunit, respectively. The amino acid composition of purified VT2 were made up in order of glutamic acid, histamine, asparaginic acid, histidine, lysine, alanine and leucine etc. The largest amount among the amino acid composing VT2 was methionine.
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차인호,김용환,Cha, In-ho,Kim, Yong-hwan 대한수의학회 1996 대한수의학회지 Vol.36 No.2
Three and 2 strains of E coli O157 were isolated from fecal materials of cattle (390) and pigs (420) in Korea, respectively. One strain of O157:H7 isolated from cattle and 2 strains of O157:H7 isolated from pigs were identified as verotoxin-1 (VT-1) produing strains and 2 strains (O157:H7 and O157:H-) isolated from cattle were identified as verotoxin-2 (VT-2) producing strains by neutralization test on HeLa and Vero cells. Culture supernatants of the isolates were cytotoxic to HeLa and Vero cells. The levels of cytotoxin produced by isolates were $10^2{\sim}10^4$ cytotoxic dose($CD_{50}$)/ml. Also, VT-2-converting bacteriophage was isolated from KSC109 strain which had been isolated from cattle. Molecular weight of the phage DNA was determined as approximately 45 Kb in 0.8% agarose gel electrophoresis, and morphology of the phage stained with phosphotungstic acid was observed by transmissible electron microscopy.
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차인호,김희진,정영수,이충국,정인혁,Cha, In-Ho,Kim, Hee-Jin,Jeong, Young-Soo,Yi, Choong-Kook,Chung, In-Hyuk 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.3
To clarify the clinical utility of the calvarial bone graft in the maxillofacial reconstruction, we performed on anatomical study by measuring the regional thickness of the parietal bone on 17 Korean adult dry skulls. Before the sectioning the calvarium, the anatomical landmarks were marked on each specimens. And then we measured the total thickness of the parietal bone, the thickness of the outer and inner cortical plates on various points in each sections of parietal bones using a digital caliper under the stereomicroscope. The total thickness of the parietal bone was ranged from 5.17mm to 7.50mm, and there were no statistical difference in the total thickness of the parietal bone on the same points bilaterally. But there was a tendency that the thickness of the parietal bone was thicker toward to the lambda point than the coronal suture area. At the other hand, the thickness of the outer and inner plate of the parietal bone was the thickest at the first point of the right aspect on the line 1, the first point of the left aspect on the line 5, respectively. In conclusion, this study showed that the donor site of the parietal bone for the maxillofacial reconstruction should be located at more posterior and medial area of the parietal bone than the prevalent known donor site.
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구강악안면외과 영역에서의 MIDFACIAL DEGLOVING APPROACH의 유용성
차인호,윤현중,이의웅,Cha, In-Ho,Yoon, Hyun-Joong,Lee, Eui-Wung 대한악안면성형재건외과학회 1998 Maxillofacial Plastic Reconstructive Surgery Vol.20 No.3
In the treatment of maxillary lesion including a maxillary sinuses, most of oral and maxillofacial surgeons have used the vestibular incision or the Weber-Fergusson incision. However, the vestibular incision has disadvantage which it provides a rather limited exposure and the Weber-Fergusson incision leaves visible scar in the midface. Furthermore, because the scar is confined on unilateral side only, the technique is hesitated to apply especially in children, younger patients and women. Since Casson first introduced midfacial degloving technique, this approach has been used frequently to treat the lesion on nasal cavity, nasopharynx, skull base and paranasal sinuses by ENT surgeons. But, we think this technique can be used usefully in oral and maxillofacial regions. So, we experienced favorable results which it provided a proper exposure, no visible facial scar and it could be used on bilateral midfacial lesions.
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