• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 추계학술대회 논문집
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• pp.414-417
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• 2001

Recently, developments of device using characteristics of ceramics as a new technical material is in progress. While doing so, Ultrasonic motor which is a part of research & flat-type $L_1-B_8$ mode Ultrasonic motor and measured the operation characteristics of its. The size of USM is 80*20*1.5[$mm{^1}$](length*width*thickness) and is constructed with stator by piezo-ceramics and stainless elastic body and rotator by bearings. As results of experiments, the fastest speed of revolution($\upsilon$), the maximum torque(T) and the efficiency($\eta$) were 37.5[cm/sec], 5.0[mN$\cdot$M] and 1.17[%] respectively when 27.9[kHz], 150[gf], 50[V] were applied. SO, we think this flat-type $L{_1}-B{_8}$ mode Ultrasonic motor is able to be used for applications in forwarding device of a paper or electric card so on. Key Words: Flat=type $L{_1}-B{_8}$ mode Ultrasonic Motors, Piezoelectric ceramics, forwarding device.

• 한국의류학회지
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• 제17권1호
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• pp.19-35
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• 1993

This study was designed to devise work wear for plastic house worker. It was carried out (1) research on the clothing actual condition through interviewings with plastic house worker and observations, (2) thermal manikin test to measure thermal resistance of experimental clothes and (3) clothing comparing test in the laboratory and in the plastic house. In the laboratory experiment, it was choosen general type (A) and new devised types (B, C) made of microporous fabric for experimental clothes. Experimental clothes were made of 6 combinations including 3 type work wears (A, B, C) and 2 type underwears (1, 2). In the plastic house experiment, it was choosen general types of A (without rest place) and B (with rest place), and devised type C (with rest place), which was appeared good effect in the laboratory experiment. The results were as followings. 1. Work environment of the plastic house in summer and winter was very different from the outer environment. Work motion in the plastic house was burden to the plastic house workers. 2. Plastic house workers had on the general type's work wear. 3. As a result of thermal manikin test, thermal resistance was appeared B1>B2>C2>C1>A1>A2 in orders. 4. In the laboratory experiment, experimental clothes A was appeared smaller burden than B, C. Effect of mesh underwear was not appeared in this study condition. In subjective sensation, experimental clothes C was lower vote than A. Therefore experimental clothes C was superior to A in subjective wearing sensation. 5. In the plastic house experiment, the experimental conditions with rest place were appeared smaller burden than without rest place. General type B was appeared more positive physiological reactions than devised type C but significances between two types was not appeared.

• 충청수학회지
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• 제27권4호
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• pp.697-705
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• 2014

For a complex measure ${\mu}$ on B and $f{\in}L^2_a(B)$, the Toeplitz operator $T_{\mu}$ on $L^2_a(B,dv)$ with symbol ${\mu}$ is formally defined by $T_{\mu}(f)(w)=\int_{B}f(w)\bar{K(z,w)}d{\mu}(w)$. We will investigate properties of the Toeplitz operator $T_{\mu}$ with symbol ${\mu}$. We define the Toeplitz type operator $T^r_{\psi}$ with symbol ${\psi}$, $$T^r_{\psi}f(z)=c_r\int_{B}\frac{(1-{\parallel}w{\parallel}^2)^r}{(1-{\langle}z,w{\rangle})^{n+r+1}}{\psi}(w)f(w)d{\nu}(w)$$. We will also investigate properties of the Toeplitz type operator with symbol ${\psi}$.

• The Korean Journal of Ecology
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• 제21권3호
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• pp.269-276
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• 1998

The study of the Rana plancyi, was done during the calling period at a pond in Osong, Chungbuk, Korea from May to the middle of August of 1996 and 1997. Five basic types of call-A, B, C, D, E, - were identified in Rana plancyi according to the structure of call types. The structure of A type call has only one pulse, B type call has two pulses and C, D type call has one separated pulse which is called introductory call and pulse group as follow it. On the other hand, E type call has 3-6 separate pulses. The interval between introductory call and pulse group is $0.73{\pm}0.29$ s(n=159) in C type call and $0.60{\pm}0.21$ s (n=48) in D type call. The number of pulses in the pulse group is $30.08{\pm}8.69$ in C type call and $15.78{\pm}2.40$ in D type call. An increase in water temperature induces a decrease in C and D type call duration (C type call r= -0.4153, p<0.001, D type call r=-0.7064, p<0.001). In case of C and D type call, the interval between introductory call and pulse group influenced more call duration than pulse group duration. We regarded A, B type call as a territorial call and C, D type call as a mating call and we recognized that E type call has the function of threat or alarm.

• The Korean Journal of Ecology
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• 제10권1호
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• pp.23-31
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• 1987

This study was carried out to investigate by the MGP analysis the composition of oribatid mite in coniferous and broad-leaved forests, Kwang Yng experiment plantation, Chola Nam Do Province, southern part of Korea. In these study area, 157 species of oribatid mites (Acari: Cryptogimata) were identified. Among them 6 species such as; Brachychochthonius jugatus JACOT, B hungaricus BALOGH, Eremulus translamealtus BALOGH et. MAHUNKA, Brachioppiella ctenifera GOLOSOVA, Striatoppia opuntiseta BALOGH et. MAHUNKA, Suctobelba perdentata baculifer BALOGH et. MAHUNKA have not been described in Korea. Species compositions were as follows; Among them 69 species were found in all the six sampling sites, 33 species scattered sporadically in all the area, 12 species found in coniferous forest, 10 species in broad-leaved forest only, and 33 species sampled at one site. According to the MGP analysis I, site B-1, B-2, and B-3 were found to be "Type G" and site C-1, C-2, and C-3 were "Type MG". According to the MGP analysis II, site B were found to be all "Type G". But site C-1 was "Type MG", C-2 was "Type M" and C-3 was "Type G" suggesting that "Group M" increased in the site C.e G" suggesting that "Group M" increased in the site C. in the site C.

• Journal of Chest Surgery
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• 제57권1호
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• pp.99-102
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• 2024

This article presents a straightforward hybrid arch technique for treating residual type B aortic dissecting aneurysms following type A repair (replacement of the ascending aorta) that employs a frozen elephant trunk (FET) straight vascular prosthesis. The debranch-first method involves only cutting and sewing the previous ascending graft, inserting the FET from zone 0, and debranching the arch vessels using a trifurcated graft. This technique is less invasive as it eliminates the need to manipulate the dissected distal arch aneurysm. We successfully applied this technique to 3 patients, with no instances of in-hospital death, stroke, or paraplegia. The debranch-first technique, combined with zone-0 FET insertion, simplifies the redo repair of residual type B aortic dissection.

• 대한인간공학회지
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• 제16권1호
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• pp.29-45
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• 1997

This study aims at designing sleeves which are suitable for arm shapes and arm movements. With the samples of of ordinary 24 women aged from 20 to 22, the arm shapes and movements were measured 3-dimensionally using a motion analyzer and a sonic digitizer, and then clasified into three characteristic types (A, B, and C). Our analysis leads to the following conclusion. The factors classifying arm shapes are the length from acromion to posterior armpit point, arm hole length, the cap height, difference in height between anterior and posterior armpit points, armhole circumference, upper arm circumferemce, armhole depth, and underarm circumference. The characteristics of arm type A is that the armhole depth and the length from acromion to posterior armpit point are the largest, while the circumference inbe- tween upper arm and elbow is the smallest among the three arm types. Thus, the large circumference difference between upper and lower arms is the most notable in arm type A. The factors classifying arm shapes for arm type B are the smallest except for the circumference inbetween upper arm and elbow which is larger than that for arm type A. The circumference difference betweemn upper and lower arms is small for arm type B. Arm type C has the smallest armhole depth, while other factors are similar to those for arm type B. In type C, the size of upper arm is comparatively small on the frontal plane, while it is the largest on the sagital plane.

• 한국동물학회지
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• 제39권2호
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• pp.215-222
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• 1996

In the previous studies, we have demonstrated that prorenin converting enzyme (PRECE) was identical to the epidermal grouch factor-binding protein (EGF-BP) type B, which was a member of the mouse glandular kallikrein family, To examine whether or not EGF-BP type A and C are involved in the processing of prorenin, we have cloned the CDNAS of the EGF-BP type h and C from a library of male ICR mouse submandibular gland (SMGI. And then CHO cells were transfected with the EGF-BP expression plasmids. and stable cell lines expressing a high level of the EGF-BPS precursor were obtained. The conditioned medium was then treated with trypsin, which has been knotvn to effectively convert the EGF-BP type A and C precursor to the active forms. 수ubsequentlv, the prorenin converting activity of the trypsin-treated or untreated medium was examined. PRECE converted exactly prorenin to renin, but the prorenin converting activities of EGF-BP type A and C were not detected. From these results, it seems that only type B of these EGF-BPs is involved in processing Ren 2 prorenin in mouse SMG.

• 한국광학회지
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• 제30권3호
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• pp.101-105
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• 2019

LCD의 광 효율을 향상시키기 위해 LCD backlight unit (BLU)의 광원으로 적색, 녹색, 청색의 광원을 사용하였으며, RGB 광은 lenticular lens array (LLA)를 통해 집광되어 각각 컬러 필터의 적색, 녹색, 청색 필터에 색일치되는 조건으로 광이 지나도록 설계하여 시뮬레이션하였다. 광원의 위치에 따라 Type-A와 Type-B 두 가지 방식으로 시뮬레이션을 진행하였으며, 그 결과 LLA를 사용하지 않았을 때와 비교하여 Type-A는 휘도가 210%로 상승하였으며, Type-B는 270% 상승함을 확인하였다. LLA의 최적의 조건은 렌즈의 높이가 $25{\mu}m$, 렌즈 간의 간격이 $3{\mu}m$일 때, 효율이 최대가 됨을 확인하였다.

• 한국식품영양과학회지
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• 제36권6호
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• pp.708-719
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• 2007

본 연구에서는 104명의 성인남녀를 대상으로 그들의 GSTT1, GSTM1, GSTP1의 유전적 다형성 분포도를 조사한 결과, 전체 대상자들 중 각각 60명(57.4%), 42명(40.6%)가 GSTT1 과 GSTM1의 유전자를 가지고 있었으며, GSTT1과 GSTM1 유전자가 둘 다를 가진 대상자는 27명(25.7%), 둘 중에 하나만 가지고 있는 사람은 47명(45.5%) 그리고 둘 다 없는 사람은 30명으로 28.7%에 해당되었다. GSTP1 유전자의 경우 homozygous(a/a) wild type은 79명(75.5%)으로 대부분의 대상자가 여기에 해당되었으며, heterozygous(a/b) heterozygous type은 22명(21.6%), 그리고 homozygous(b/b) wild type으로 나타난 대상자는 3명(2.9%)이었다. GSTT1 null type은 산화적 스트레스를 더 많이 받고 있는 것으로 알려진흡연자의 비율이 present 군에 비해 낮음에도 불구하고 적혈구 GSH의 농도는 유의적으로 낮고 임파구 DNA 손상정도는 유의적으로 높은 것으로 나타났다. GSTM1 유전자의 경우 적혈구 GSH-Px의 활성만이 GSTM1 null type이 presenttype에 비해 유의적으로 높은 것으로 나타났으며, 나머지 다른 지표에서는 GSTM1 null type과 present type 간의 유의적인 차이가 없었다. GSTP1 유전자 다형성에 따른 항산화 영양상태의 유의적인 차이는 없었다. 흡연과 GST 유전자 다형성의 상호작용결과, 혈장 ${\alpha}$-carotene 농도, 적혈구 GSH-Px와 GST 활성은 GSTT1 null type의 경우 흡연자에 비해 비흡연자가 유의적으로 높게 나타났으며, GSTT1 present type에서는 흡연자와 비흡연자간의 유의적인 차이가 없는 것으로 나타났다. GSTM1 유전자의 경우 GSTM1의 null type에서 흡연자의 경우 비흡연자에 비해 혈장 ${\gamma}$-tocopherol과 ${\beta}$-carotene 수준이 유의적으로 낮았다. GSTT1과 GSTM1 유전자가 둘 다 없는 경우(both null)에는 흡연자의 혈장 lycopene과 적혈구 GST 활성이 비흡연자에 비해 유의적으로 낮았다. GSTP1 유전자의 경우 혈장 ${\alpha}$-carotene과 적혈구 GSH-Px 활성은 a/a type의 흡연자가 비흡연자에 비해 유의적으로 낮았고, 적혈구 catalase의 활성은 a/b type에서 흡연자가 비흡연자에 비해 유의적으로 낮았으며, ${\beta}$-carotene 농도는 두 type 모두에서 유의적으로 흡연자가 낮았다. 이상의 연구 결과 GST 유전적 다형성에따라 산화, 항산화 관련 효소 활성 및 항산화 영양소 수준의상태가 차이가 있음을 알 수 있었으며, 특히 흡연자의 경우 GST 유전자 type에 따라 항산화 영양상태가 더 큰 영향을 받음을 알 수 있었다. 이러한 연구 결과는 유전적 다형성에따라 항산화 영양소의 권장수준을 책정하는데 기초연구자료로 활용될 수 있을 것이다. 즉, GSTT1 또는 GSTM1 null type의 경우 비흡연자에 비해 흡연자가 항산화 영양소 수준이 더 낮게 나타났으므로 그들의 체내 항산화 영양 상태를 증가시킬 수 있는 여러 방안들, 즉 항산화 비타민의 보충투여 및 야채와 과일의 섭취 권장 등이 고려될 수 있을 것이다. 또한 GST 유전자 다형성에 따라 항산화 영양상태의 차이가 있으므로 항산화 관련 in vitro 실험, 동물 및 인체 실험의 결과 해석 시 나타나는 개인 간의 변이차이는 GST 유전자 다형성으로 일부분 설명될 수 있으리라 기대된다. 향후대상자의 범위를 좀 더 넓혀서 GST 유전자 다형성과 항산화 영양상태의 관계를 규명하고자 하며 더불어 산화물질 해독에 관여하는 다른 유전자(CYP 450, SULT 등)의 역할에 대해서도 계속적인 연구가 필요하다고 사료된다.