새로운 천년을 여는 경희대학교

조정원,Jo, Jeong-Won 한국대학교육협의회 1999 大學敎育 Vol.98 No.-

실내 복도환경에서의 컨벌루션 신경망을 이용한 드론의 자율주행 연구

조정원,이민혜,남광우,이창우,Jo, Jeong Won,Lee, Min Hye,Nam, Kwang Woo,Lee, Chang Woo 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.8

실내 자율 주행은 실외 환경에서의 자율 주행과는 다른 환경적인 요소가 주어진다. 폐쇄된 환경에서 좁은 길을 따라 주행해야 하며, 불규칙한 조명, 계단과 같은 지형의 특성, 바닥에 산재한 장애물 등 실외 환경과 다른 요소를 극복해야 한다. 또한 실내 복도에서의 주행은 텍스처가 유사하거나 다양성이 적은 환경의 경우 복잡한 환경에 비해 인식에 어려움이 있다. 본 논문에서는 다양성이 적은 실내 복도환경에서의 컨벌루션 신경망(CNN)을 이용한 자율 주행 드론을 연구한다. 설계한 신경망은 드론의 전면 카메라로부터 이미지를 받아온 후, 그 이미지를 바탕으로 다음 경로를 예측하여 드론을 조향한다. 총 38번의 주행 테스트 결과, 복도 주변의 벽이나 문에 부딪히지 않고 직선 구간을 완주하여 다양성이 적은 실내 환경에서의 주행 성능을 확인할 수 있었다. Autonomous driving of drone indoor must move along a narrow path and overcome other factors such as lighting, topographic characteristics, obstacles. In addition, it is difficult to operate the drone in the hallway because of insufficient texture and the lack of its diversity comparing with the complicated environment. In this paper, we study an autonomous drone navigation using Convolution Neural Network(CNN) in indoor environment. The proposed method receives an image from the front camera of the drone and then steers the drone by predicting the next path based on the image. As a result of a total of 38 autonomous drone navigation tests, it was confirmed that a drone was successfully navigating in the indoor environment by the proposed method without hitting the walls or doors in the hallway.

대학 국제경쟁력 제고를 위한 경영 혁신 전략

조정원,Jo, Jeong-Won 한국대학교육협의회 2002 大學敎育 Vol.118 No.-

스월 충돌제트의 열전달 특성에 관한 실험적 연굴

조정원,이상준,Jo, Jeong-Won,Lee, Sang-Jun 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.10

The heat transfer characteristics off swirling air jet impinging on a heated flat plate have been investigated experimentally. The main object is to enhance the heat transfer rate by increasing turbulence intensity of impinging jet with a specially designed swirl generator. The mean velocity and turbulent intensity profiles of swirling jet were measured using a hot-wire anemomety. The temperature distribution on the heated flat surface was measured with thermocouples. As a result the swirl effect on the local heat transfer rate on the impinging plate is confined mainly in the small nozzle-to-plate spacings such as L/D<3 at the stagnation region. For small nozzle-to-plate spacings, the local heat transfer in the stagnation region is enhanced from the increased turbulence intensity due to swirl motion, compared with the conventional axisymmetric impinging jet without swirl. For example, the local Nusselt number of swirling jet with swirl number Sw=0.75 and Sw=1 is about 9.7-76% higher than that of conventional impinging jet at the radial location of R/D=0.5. With the increase of the nozzle-to-plate distance, the stagnation heat transfer rate is decreased due to the diminishing axial momentum of the swirling jet. However, the swirling impinging jet for all nozzle-to-plate spacings tested in this study does not enhance the average heat transfer rate.

사학의 경쟁력은 곧 국가경쟁력

조정원,Jo, Jeong-Won 한국대학교육협의회 1998 大學敎育 Vol.92 No.-

메쉬 스크린을 이용한 충돌제트 열전달 제어에 관한 연구

조정원,이상준,Jo, Jeong-Won,Lee, Sang-Jun 대한기계학회 2001 大韓機械學會論文集B Vol.25 No.5

The local heat transfer of an axisymmetric submerged air jet impinging on a heated flat plate is investigated experimentally with the variation of mesh-screen solidity. The screen installed in front of the nozzle exit modifies the flow structure and local heat transfer characteristics. The mean velocity and turbulence intensity profiles of streamwise velocity component are measured using a hot-wire anemometry. The temperature distribution on the heated flat surface is measured with thermocouples. The smoke-wire flow visualization technique was employed to understand the near-field flow structure qualitatively for different mesh screens. Large-scale toroidal vortices and high turbulence intensity enhance the heat transfer rate in the stagnation region. For a higher solidity, turbulence intensity become higher which increases the local heat transfer at small nozzle-to-plate spacings such as L/D<6. The local and average Nusselt numbers of impinging jet from the $\sigma$(sub)s=0.83 screen at L/D=2 are about 5.6∼7.5% and 7.1% larger than those for the case of no screen, respectively. For the nozzle-to-plate spacings larger than 6, however, the turbulence intensities for all tested screens approach to an asymptotic curve and the mean velocity along the jet centerline decreases monotonically. As the nozzle-to-plat spacing increases for high solidity screens, the heat transfer rate decreases due to the reduction in turbulence intensity and jet momentum.

국내 피부과 관련 모바일 어플리케이션의 현황 분석

조정원 ( Jeong Won Jo ),정도선 ( Do Seon Jeong ),김지연 ( Chi Yeon Kim ) 대한피부과학회 2020 대한피부과학회지 Vol.58 No.1

Background: Mobile applications are useful in the field of dermatology as diagnosis and treatment are based on visual inspection. However, in Korea, dermatology-related applications have not been developed effectively despite the high rate of mobile internet usage. In addition, there is no report on the current trends of dermatology-related mobile application. Objective: This study aimed to identify and categorize the available dermatology-related mobile application and compare the current trends in Korea with those in the US. Methods: Eight dermatologic terms were queried in two mobile platforms, Android and iOS. Applications were categorized by function based on their description. The number of reviews, rating, provider, target audience, and price of applications were recorded. Results: A total of 213 dermatology-related applications were identified. Approximately 10.8% of the applications were related to skin diseases, 23.5% were related to skin care, and 65.7% were others. Among the applications related to skin diseases, 4.2% were self-surveillance/diagnosis apps, 3.3% were disease guide and reference apps, and 1.4% were dermoscopy apps. No applications were related to educational aid and photography search. Among the applications related to skin care, 12.7% were self-surveillance/diagnosis apps used for general skin care, 3.8% were skin care apps, and 2.8% were cosmetics apps. Other categories included shopping (24.9%), advertisements (15.0%), and hospital searches (15.0%). Conclusion: The development and use of dermatology mobile applications can contribute to the efficient delivery of accurate information to patients, educate patients, and further reduce the prevalence of skin diseases. Therefore, dermatologists should play a leading role in presenting the direction for dermatology-related mobile application development. (Korean J Dermatol 2020;58(1):7∼13)

U-Net 앙상블을 이용한 LeafNet의 성능향상

조정원(Jeong-won Jo),이창우(Chang-woo Lee) 한국정보통신학회 2019 한국정보통신학회 종합학술대회 논문집 Vol.23 No.2

Ofloxacin 안연고에 의해 유발된 눈주위 알레르기접촉피부염

조정원 ( Jeong Won Jo ),정해봉 ( Hae Bong Jeong ),신영빈 ( Young Bin Shin ),강기련 ( Kee Ryeon Kang ),김지연 ( Chi Yeon Kim ) 대한피부과학회 2018 대한피부과학회지 Vol.56 No.10

Allergic contact dermatitis is an inflammatory condition associated with periorbital erythema, edema, and pruritus. The periorbital skin is relatively thin compared with the skin over other facial areas; therefore, it is vulnerable to allergen penetration and may show a variety of cutaneous manifestations. Recently, vision enhancement surgery is a widely performed procedure, and the prevalence of senile cataract and glaucoma is increasing. The prevalence of periocular allergic contact dermatitis is increasing secondary to the growing use of topical ophthalmic medications. Several studies in Korea have reported periocular allergic contact dermatitis secondary to the use of topical ophthalmic medications including latanoprost (Latano^®), fluorometholone (Tolon^®), polymyxin B (Terramycin^®), atropine sulfate (Atropine^®), neomycin sulfate (Cambison^®), and befunolol hydrochloride (Bentos^®), among others. However, ofloxacin (Effexin^®)-induced allergic contact dermatitis has not been reported in the domestic and/or foreign literature. We report a case of periocular allergic contact dermatitis secondary to the use of ofloxacin ophthalmic ointment. (Korean J Dermatol 2018;56(10):624∼627)

가려움증의 신경전달 경로

조정원(Jeong Won Jo),김지연(Chi-Yeon Kim) 한국생명과학회 2017 생명과학회지 Vol.27 No.5

가려움증의 분류는 수용체성 가려움증(Pruritoceptive itch), 신경병증 가려움증(Neuropathic itch), 신경성 가려움증(Neurogenic itch), 심인성 가려움증(Psychogenic itch)의 신경생리학적 기전에 따른 4가지 카테고리로 분류하는 것이 일반적이었으나 최근 임상적인 기준을 통해 분류하기도 한다. 가려움증의 신경전달 경로는 히스타민-의존 경로와 히스타민-비의존 경로 2가지로 나뉘며 각 가려움증 매개체마다 서로 다른 수용체와 신경펩티드가 작용한다. 히스타민, BAM8–22, chloroquine 등의 가려움증 매개체는 히스타민-의존 경로를 통해 신호가 전달되며 cowhage spicule, 단백분해효소(protease), TSLP (Thymic stromal lymphopoietin) 등의 매개체가 히스타민-비의존 경로와 관련있다는 보고가 있다. 이러한 가려움증 매개체, 수용체, 신경펩티드는 가려움증 치료의 대상이 된다. 가려움증과 통증은 대표적인 유해자극으로서 과거에는 두 감각이 하나의 유해자극수용체를 통해 전달된다는 주장이 있었지만 최근 밝혀진 바에 따르면 가려움증과 통증은 독립적인 신경전달체계를 가지고 있으며 두 신경체계는 서로 억제작용을 한다. 가려움증 뉴런의 선택적 소집단이 존재한다는 주장을 뒷받침하는 연구들이 이 주장에 무게를 싣고 있다. 또한 가려움증과 통증의 상호 길항작용에 대해서도 다양한 기전으로 설명되고 있다. 최근에도 새롭게 연구되는 매개체와 수용체들이 많은 연구들을 통해 밝혀지고 있다. 특히 최근에는 히스타민 4 수용체에 대한 연구가 활발히 진행되고 있는데, 이는 T 세포 같은 면역세포 자체에 발현되어 있어 이 H4 수용체를 차단하는 치료제는 말초의 매개체를 차단하는 기존의 히스타민 수용체 차단제와는 달리 가려움증 만성화에 중요한 염증반응 자체를 억제할 수 있다는 점에서 그 유용성이 크다고 할 수 있다. 가려움증의 기본적인 발생 기전에 대한 이해와 새로운 가려움증 매개체에 대한 연구는 효과적인 치료법의 개발로 이어질 것이며 이것이 가려움증 연구가 나아갈 바로 생각한다. It was common that the classification of itching was classified into four categories according to the neurophysiological mechanisms of pruritoceptive itching, neuropathic itching, neurogenic itching and psychogenic itching. Recently it was classified by clinical criteria. The neurotransmission pathway of itch is divided into histamine-dependent pathway and histamine-independent pathway. Different receptors and neuropeptides act on each itch mediator. Itch mediators such as histamine, BAM8-22, and chloroquine are transmitted through the histamine-dependent pathway. Cowhage spicule, protease, and TSLP (Thymic stromal lymphopoietin) have been reported to be related to the histamine-independent pathway. These itch mediators, receptors, and neuropeptides are the targets of treatment for itching. Although itching and pain are typical noxious stimuli, and in the past, it was argued that two senses were transmitted through one noxious stimulus receptor. It has recently been shown that itching and pain have an independent neurotransmitter system and both neuronal systems inhibit each other. In addition, the mutual antagonism between itching and pain is explained by various mechanisms. Recently, many new mediators and receptors are being studied. The studies on histamine 4 receptor (H4 receptor) have been actively conducted. And the H4 receptors are expressed in immune cells such as T cells. The therapeutic agent for blocking the H4 receptor can inhibit the inflammatory reaction itself, which is important for the itching and chronicization. Understanding the underlying mechanisms of itching and studying new itch mediators will lead to the development of effective therapies, and this is what I think the itching study will go on.