백서구치의 실험적 치아이동시 치근막 혈관변화에 관한 혈관주형법을 이용한 연구

임용규(Yong-Kyu Lim),양원식(Won-Sik Yang) 대한치과교정학회 1994 대한치과교정학회지 Vol.24 No.1

This study was undertaken to investigate the three dimensional vascular changes of periodontal ligament following orthodontic tooth movement. Experimental tooth movement was carried out in 96 Sprague-Dawley rats with the weight of 250g. They were divided into four experimental groups (each 24 rats). The left maxillary first molar was moved mesially with 25g force in group I, and with 75g force in group II. Each three animals were sacrificed after 1, 6, 12, 24 hours, and 3, 7, 14, 21 days. In group III, 25g mesial force was applied for 3 days, and in group IV, 75g mesial force was applied for 3 days. Then the appliances were removed, and each three animals were sacrificed after 1, 6, 12, 24 hours, and 3, 7, 14, 21 days from removal of appliance. The contralateral molars were used for control group. Casting media was injected via left ventricle and polymerized in warm water. After corrosion of surrounding soft tissue, three dimensional vascular changes were examined using scanning electron microscopy. The findings of this study were as follows: 1. Pressure side of group I and II showed degenerative vascular changes such as vascular compression, reduction of vasculature, leakage of casting media. But, regenerative changes were dominant after 7 days of tooth movement. Although the degenerative vascular changes were more severe in group II, which was exposed to heavy force, the timing of these changes was not different between two groups. 2. Periodontal vasculature was reestablished by the growth of new capillaries and their differentiation and union from the remaining periodontal vessels and vessels of alveolar bone marrow. Although vascular regeneration was more rapid in group I, which was exposed to light force, the vasculature was not fully normalized in both groups even after 21 days. 3. There was no remarkable changes in tension side of group I and II, but looping of capillary, new capillary growth, dilation of vessels, redirection of vessels in the direction of tensile force were occurred. 4. In pressure side of group III and IV, in which appliance was removed after 3 days of orthodontic force, bone resorption was continued even after removal of appliance. Regeneration of vasculature was initiated after 1-6 hours, and it was more rapid in group III than group IV. In both groups, the vasculature was not fully normalized even after 21 days. 5. After removal of appliance, tension side of group III and IV showed vascular compression and loss of vasculature.

Beta 방사선원을 이용한 정전기 제거법에 대한 고찰

임용규(Yong Kyu Lim),로성기(Seung Gy Ro) 대한전기학회 1965 전기의 세계 Vol.14 No.1

This experiment is based on "the feasible improvement studies for an eliminating device of the static electricity which applies the ionizing effect of beta radiation." In order to accomplish this object, the following problems were necessarily considered to investigate and to determine. The efficiency of the elimination of static electricity was determined by means of measuring the ion current between electrically charged plates with micro-ammeter. The effects of various factors, i.e., the distance between charged plate and radiation source, the activity of radiation source, the electric otential and the area of the charged plate, the shape of the source housing, the lining of backscattering material (Pb) on the source housing surface and blowing of ionized air, on the static electricity eliminating efficiency were studied. The beta radiation sources used in this experiment were S and Sr -Y . It was revealed that ion current increased with source activity, the electric potential and area of the plates, the lead (Pb) lining on the surface of the source housing and the velocity of the ionized air blowing. As one could expect the S was more effective to increase the ion current since it is known to be a higher specific ionization source than Sr -Y . The detailed result and performance of the eliminating device of the static electricity are described here.ibed here.

안면열에 대한 고찰 및 안면열 환자의 교정 치험예

임용규(Yong-Kyu Lim),양원식(Won-Sik Yang) 대한치과교정학회 1990 대한치과교정학회지 Vol.20 No.3

Facial cleft is not a common anomaly of craniofacial region. But it is often accompanied with cleft lip and/or palate, so it seems important to orthodontist. Facial cleft is defined as a fissure or elongated opening of the facial region, and it´s etiology is the failure of the fusion of the parts which will form the face in embryonic developmental period. Facial cleft can be classified according to the time of occurrence and the area involved during developmental period. It develops 1-2.5 weeks earlier than cleft lip and/or cleft palate. In facial cleft, the deformity is generally confined to the facial region, but sometimes deformity of other body region can accompany. The interaction of the facial cleft and the genetic anomaly is not confirmed, but genetic anomaly is known to be able to occur in the patient with other anomaly of body. As an orthodontist we should know the general considerations of facial cleft and it´s treatment procedures other than orthodontic treatment.

복싱 레프트 스트레이트 동작의 운동학적 분석

임용규(Lim Yong-Kyu),김성주(Kim Seong-Joo) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2

The purpose of this study is to provide basic data on kinematic analysis of boxing movement of a left straight punch based on its form. National-class six boxers with more than 10 years of career who often enjoy out-boxing took part in the research. 3D motion analysis was carried out using two high-speed cameras, and its results serve as the basis for the following conclusion. Taken together kinematic variables, type1 allows short, weak but quick jab while type 3 allows long and strong punch. From this, it is believed that boxers can selectively deliver a left straight punch depending on the distance to the opponent.

표면적이 증가된 분별침전에서 친수성 고분자물질을 이용한 paclitaxel의 입자 크기 감소

임용규 ( Yong Kyu Lim ),김진현 ( Jin Hyun Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2015 한국미생물·생명공학회지 Vol.43 No.4

본 연구에서는 표면적이 증가된 분별침전 공정에 친수성 고분자물질을 첨가하여 식물세포 유래 항암물질 paclitaxel 의 입자 크기를 감소시키고자 하였다. 표면적이 증가된 분별침전 공정에 고분자물질(PVA, HPMC 2910, PVP-K90)을 첨가할 경우 침전물의 입자 크기는 획기적으로 감소하였다. 첨가된 고분자물질 중 PVP-K90가 가장 효과적이었으며, PVPK90 농도 0.2%(w/v)로 첨가한 경우 고분자물질을 첨가하지 않은 경우보다 4-5배 정도 가장 작은 입자 크기(<20 μm radius)의 침전물을 얻었다. 또한 분별침전을 통해 얻은 침전물의 입자 크기는 분별침전 용액의 제타전위 절대값에 반비례함을 알 수 있었다. In this study, we applied an increased surface area fractional precipitation with hydrophilic polymer for decreasing the particle size of the anticancer agent paclitaxel from plant cell cultures. The addition of polymer resulted in a considerable decrease in the size of the paclitaxel precipitate. Among the polymers (HPMC 2910, PVP-K90, PVA) used, PVP-K90 was the most effective for the inhibition of precipitate growth. When PVP-K90 (0.2%, w/v) was used, the paclitaxel particles were four to five times smaller, having less than a 20 μm radius, than those obtained in the absence of the polymer. In addition, the precipitate size was inversely correlated with the absolute value of zeta potential.

原子力의 安全性

林瑢圭(Yong-Kyu Lim) 대한전기학회 1985 전기의 세계 Vol.34 No.12

우리나라 原子力利用開發과 安全性確保

林瑢圭(Yong-Kyu Lim) 대한전기학회 1982 전기의 세계 Vol.31 No.11

패치형 웨어러블 심전도 측정 시스템을 위한 접착성 폴리우레탄 기반의 용량성 전극

이정수,이원규,임용규,박광석,Lee, Jeong Su,Lee, Won Kyu,Lim, Yong Gyu,Park, Kwang Suk 대한의용생체공학회 2014 의공학회지 Vol.35 No.6

Wearable medical device has been a resurgence of interest thanks to the development of technology and propagation of smart phone in recent years. Various types of wearable devices have been introduced and available in market. Capacitive coupled electrode which measures electrocardiogram over cloth is able to be applied wearable device. In previous approaches of capacitive electrode, they need proper pressure for stable contact of the electrode to body surface. However, wearable device that gives pressure on body surface is not suitable for long-term monitoring. In this study, we proposed adhesive polyurethane-based capacitive electrode for patch-type wearable electrocardiogram (ECG) monitoring device. Self-adhesive polyurethane make the electrode and whole system be adhered to the surface of skin without any pressure. The patch-type system is consisted of analog filter, analog-to-digital converter and wireless transmission module and designed to be attached on the body as a patch. To validate the feasibility of the developed system, we measured ECG signal in stable and active state and extracted heart rate. Therefore, we observed skin response after long-term attachment for biocompatibility of the adhesive polyurethane and adhesive strength of it. The result shows the possibility of applying the developed system for ECG monitoring in real-life.

경험적 증발량 공식을 적용한 용담댐 시험유역의 수면증발량 추정

박민우,이주헌,임용규,권현한,Park, Minwoo,Lee, Joo-Heon,Lim, Yong-kyu,Kwon, Hyun-Han 한국수자원학회 2024 한국수자원학회논문집 Vol.57 No.2

This study introduced a method of estimating water surface evaporation using the physical-based Penman combination equation (PCE) and the Penman wind function (PWF). A set of regression parameters in the PCE and PWF models were optimized by using the observed evaporation data for the period 2016-2017 in the Yongdam Dam watershed, and their effectiveness was explored. The estimated evaporation over the Deokyu Mountain flux tower demonstrated that the PWF method appears to have more improved results in terms of correlation, but both methods showed overestimation. Further, the PWF method was applied to the observed hydro-meteorological data on the surface of Yongdam Lake. The PWF method outperformed the PCE in the estimation of water surface evaporation in terms of goodness-of-fit measure and visual evaluation. Future studies will focus on a regionalization process which can be effective in estimating water surface evaporation for the ungauged area by linking hydrometeorological characteristics and regression parameters.

치조성 양악 전돌 환자에서 컴퓨터를 이용한 치료 결과 예측의 정확성

이리나(Rhi-na Lee),임용규(Yong-Kyu Lim),이동렬(Dong-Yul Lee) 대한치과교정학회 2002 대한치과교정학회지 Vol.32 No.3