과배란 처치시 우세난포 조절에 의한 한우 수정란 생산성 향상에 관한 연구 II. 과배란 처치 시기에 따른 난소반응

이동원,이병천,황우석,Lee, Dong-won,Lee, Byeong-chun,Hwang, Woo-suk 대한수의학회 2000 大韓獸醫學會誌 Vol.40 No.4

This study was investigated the ovarian response following superovulation treatment at different day of diestrus. The criterion for the presence or absence of a dominant follicle based on their morphological examination. Dominant follicle was puntured 48 hrs before the oneset of superovulation treatment by ultrasonography guided aspiration needle. Superovulation was induced by subcutaneous administration of FSH twice a day for 4 day in a decreasing regimen. There was no significant different between presence of dominont follicle and progesterone concentration/diameter of corpus luteum in HanWoo. Number of corpus luteum of donor after superovulation treatment was not significantly different in FSH administration at day 9, 11 and day 13 of estrus($14.5{\pm}4.5$, $15.5{\pm}5.6$ and $11.0{\pm}5.5$, respectively). But, the diameter of CL was significantly correlate(R2 = 0.757) with progesterone levels on day of superovulatory induction. After 7 days of artificial insemination, the embryos at 7 days were collected by uterine flushing after dominant follicle aspiration and superovulation treatment, and evaluated their quality by morphological criteria. Fifty five embryos with excellent, good and fair grade were transferred into 24 recipient cows. Seventeen offsprings, 1 of triplet, 4 of twins and 6 of singlet, were yield from 10 recipient cow. In conclusion, the present study showed that 1) dominant follicle can be determined by ultrasonography with rectal palpation by morphological evaluations, 2) superovulation response after follicular aspiration was not differ at day 9, 11 and 13 of estrus, 3) dominant follicle did not affect to progesterone concentration and diameter of CL, and 4) diameter of CL was significantly correlate to the level of progesterone concentrations in HanWoo.

입자 사이즈에 따른 Cu 필름의 에어로졸 성막 거동에 대한 연구

이동원,오종민,Lee, Dong-Won,Oh, Jong-Min 한국전기전자재료학회 2017 전기전자재료학회논문지 Vol.30 No.4

The effect of particle sizes on the aerosol deposition (AD) of Cu films is investigated in order to understand the deposition behaviors of metal powder during the AD process. The Cu coatings fabricated by using $2{\mu}m$ Cu powders had a dense microstructure, a high deposition rate ($1.6{\pm}0.2{\mu}m/min$), and low resistance ($9.42{\pm}0.4{\mu}{\Omega}{\cdot}cm$) compared to that from using Cu powder with a particle size greater than $5{\mu}m$. Also, from estimating the internal micro-strain of Cu films, the Cu coatings fabricated by using $2{\mu}m$ Cu particles exhibited a high micro-strain value of $3.307{\times}10^{-3}$. On the other hand, the strain of Cu coatings fabricated with $5{\mu}m$ particles was decreased to $2.76{\times}10^{-3}$. These results seem to show that the impacted Cu particles are compressed and flattened by shock waves, and that their bonding is associated with the high internal micro-strain caused by plastic deformation.

치매(痴呆)에 관(關)한 동서의학적(東西醫學的) 비교(比較) 고찰(考察)

이동원,신길조,이원철,Lee, Dong-Weon,Shin, Gil-Jo,Lee, Won-Chul 대한한방내과학회 1995 大韓韓方內科學會誌 Vol.16 No.1

This study was done in order to investigate the etiology and pathology of dementia in the variety literature. Dementia in elderly persons(above the age of 60) mainly classfied Alzheimer disease and Cerebral vascular dementia. The results were as follows: 1. Dementia patients have abnormal mental function, who have no mental weakness but defects of memory, verbal disturbance, behavior disturbance and loss of intellectual function. 2. Dementia regard as 'me-beng(?病)', 'jeon-gwang(癲狂)', and 'heo-ro(虛勞)' in oriental medicine and the symptom is a silence with no response, mixing, a crying or a laugh, a stranger behavior and a amnesia; disturbances of speech, emotion, behavior. 3. Dementia caused by Alzheimer disease, Multi infarct dementia, Parkinson's disease, sequelae of acute CO poisoning, head injury and alcoholism(occidental medically) and the 'Dam(痰) and Damhwa(痰火), weakness of heart and spleen(心脾虛) caused by pent up anger of seven emotions(七情鬱結), the weakness of liver and kidney(肝腎不足)(oriental medically). 4. The causes of Alzheimer disease are various; a heredity factor, a morphological factor of brain tissues, a psychological factor and a biochemical factor (occidental medically) ; the 'Dam(痰) and Damhwa(痰火) caused by weakness of the internal organs and disturbance of the emotions(oriental medically). 5. Cerebral vascular dementia caused by loss of the certain cerebral neurons and oriental medically caused by obstruction of 'dam(痰)' or 'eo heul(瘀血)'. It is recommended that further study of many sided investigations, specially against a weakness of spiritual functions and a certain neurotoxin in the future.

설문지를 통한 한국인 아토피피부염 임상병력의 진단적 중요성에 관한 연구

이동원,변대규,김진우 ( Dong Won Lee,Dae Gyoo Byun,Jin Wou Kim ) 대한피부과학회 1997 대한피부과학회지 Vol.35 No.3

Backgroud: Recent studies have shown an incomplete agreement with the previously proposed diagnostic criteria of Hanifin and Rajka for atopic dermatitis(AD). This could be due to ethnic differences in the clinical manifestations of AD. To make a diagnosis of AD with confidence, one has to depend on the history and clinical picture according to race. Objectives : The purpose of the present study was to find out the importance of individual symptoms and histories for the diagnosis of Korean AD by questionnaire. Methods : The frequency of 25 questionnaire items was studied in 130 patients with typical AD (48 childhood, 82 adolescence/adult) compared to that in 198 control subjects (89 childhood, 109 adolescence/adult). Results : Nine items(itchy with bodily heat, itchy when sweating, cholinergic urticaria, miliaria, irritation with fabrics, food reaction, pollen allergy, itch with stress) were shown to be of much diagnostic significance(p<0.001) in childhood AD,otherwise thirteen items(itchy with bodily heat, itchy when sweating, cholinergic urticaria, sense of fever, excessive sweating, miliaria, irritation with cosmetics, irritation with fabrics, irritation prone hands, itchy with woolen clothes, pollen allergy, itch with stress, dermographism) were in adolescent and adult, AD. ConClusion : We found some diagnostic significance of clinical histories in Korean AD patients by questionnaire. We propose that this accessible questionnaire would be an efficient and powerful method with which to obtain new and valid information on AD. (Kor J Dermatol 1997;35(3): 443-445)

화학기상응축공정에 의한 WS₂ 나노입자의 합성 및 특성평가

이동원,김주형,올레그토로츠코,윤중열,김병기,Lee, Dong-Won,Kim, Ju-Hyeong,Tolochko, O.,Yun, Jung-Yeul,Kim, Byung-Kee 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.4

Nano-sized tungsten disulfide ($WS_2$) powders were synthesized by chemical vapor condensation (CVC) process using tungsten carbonyl ($W(CO)_6$) as precursor and vaporized pure sulfur. Prior to the synthesis of tungsten disulfide nanoparticles, the pure tungsten nanoparticles were produced by same route to define the optimum synthesis parameters, which were then successfully applied to synthesize tungsten disulfide. The influence of experimental parameters on the phase and chemical composition as well as mean size of the particles for the produced pure tungsten and tungsten disulfide nanoparticles, were investigated.

열화학적 방법에 의한 산소센서용 세리아 나노분말 합성

이동원,최준환,임태수,김용진,Lee Dong-Won,Choi Joon-Hwan,Lim Tae-Soo,Kim Yong-Jin 한국분말야금학회 2006 한국분말재료학회지 (KPMI) Vol.13 No.3

The nanostructured cerium oxide powders were synthesized by spray thermal decomposition process for the use as the raw materials of resistive oxygen sensor. The synthesis routes consisted of 1) spray drying of water based organic solution made from cerium nitrate hydrate ($Ce(NO_3){_3}6H_2O$) and 2) heat treatment of spray dried precursor powders at $400^{\circ}C$ in air atmosphere to remove the volatile components and identically to oxidize the cerium component. The produced powders have shown the loose structure agglomerated with extremely fine cerium oxide particles with about 15 nm and very high specific surface area ($110m^2/g$). The oxygen sensitivity, n ($Log{\propto}Log (P_{O2}/P^o)^{-n}$ and the response time, $t_{90}$ measured at $600^{\circ}C$ in the sample sintered at $1000^{\circ}C$, were about 0.25 and 3 seconds, respectively, which had much higher performances than those known in micron or $100{\sim}200nm$ sized sensors.

고역률 LED 구동회로의 효율화에 관한 연구

이동원,김병철,Lee, Dong Won,Kim, Byungcheul 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.8

The rectified voltage supplied to LED lamp is used in load and then the surplus voltage can be produced in LED lighting. In this case, LED lighting is proposed that can recyclable the excess voltage to supply power to the controller.

최소시간 강하선 문제의 실증적·수학적 고찰

이동원,이양,정영우,Lee, Dong Won,Lee, Yang,Chung, Young Woo 영남수학회 2014 East Asian mathematical journal Vol.30 No.4

We can easily see the 'cycloid slide' in the many mathematics and science museums. The educational materials, however, do not give us any mathematical principle. For this reason, we, in this thesis, first study the brachistochrone problem in the history of mathematics, and suggest a method of how to teach the principle using 'the dynamic geometry software GSP5' in order to help students understand the idea that the cycloid is the brachistochrone. Secondly, we examine the origin of the calculus of variations and apply it to prove the brachistochrone problem in order to build up the teachers' background knowledge. This allows us to increase the worth of history of mathematics and recognize how useful the learning is which uses technological tools or materials, and we can expect that the learning which makes use of cycloid slide will be meaningful.

3상 교류전원 LED 램프의 광 플리커

이동원,김병철,Lee, Dong Won,Kim, Byungcheul 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.4

This study describes that light flicker of LED lamp is improved by placing an AC-powered LED block in each phase of three-phase AC power. Rectified current is considered as an instantaneous luminous flux because the current flowing through the LED block is proportional to the amount of light emitted by the LED block. Percent flicker is calculated simply by modeling the rectified current flowing through the LED block to a triangular wave current. Percent flicker is 100% in single-phase AC powered LED lamp. Percent flicker of the same level as that in an incandescent lamp (6%~14%) is however, achieved if light emission starts before $40^{\circ}$ in each voltage phase of three-phase AC power.

탄탈륨 산화물의 마그네슘 가스환원에 의한 탄탈륨 금속분말 제조

이동원,Lee, Dong-Won 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.5

Metallic tantalum powder is manufactured by reducing tantalum oxide ($Ta_2O_5$) with magnesium gas at 1,073-1,223 K in a reactor under argon gas. The high thermodynamic stability of magnesium oxide makes the reduction reaction from tantalum oxide into tantalum powder possible. The microstructure after the reduction reaction has the form of a mixture of tantalum and magnesium oxide, and the latter could be entirely eliminated by dissolving in weak hydrochloric acid. The powder size in SEM microstructure for the tantalum powder increases after acid leaching in the range of 50-300 nm, and its internal crystallite sizes are observed to be 11.5 to 24.7 nm with increasing reduction temperatures. Moreover, the optimized reduction temperature is found to be 1,173 K as the minimum oxygen concentration is approximately 1.3 wt.%.