신생아에서의 HDL-C와 LDL-C 値에 관한 연구

한병길,정용헌 충남대학교 의과대학 지역사회의학연구소 1996 충남의대잡지 Vol.23 No.1

The values of serum HDL-C and LDL-C were measured in 70 newborn infants with gestational ages from 35-43 weeks, birth weight from 2000 to 4500 gm, Apgar score 7 or more at 1 & 5 minutes and normal physical examination. 1. In all newborn infants, the mean HDL-C values & ranges were 31.99 ±6.67 mg/dl, from 21.5 to 49.8mg/dl, and the mean LDL-C values & ranges were 41.42 ±21.39mg/dl from 15.1 to 94.3mg/dl. 2. In term newborns with AGA, the mean HDL-C & LDL-C values were 32.85 ±6.75mg/dl and 45.85 ±21.39mg/dl respectively. 3. The HDL-C and LDI-C values of female were significantly higher than those of male. 4. The correlation of HDL-C by weight for gestational age was not significant, but that of LDL-C value was significantly lower in SGA than those of AGA & LGA. 5. The correlations of HDL-C & LDL-C according to birth weight, gestational age and Ponderal Indices were not significant.

가상 물체의 기하학 정보 전달의 향상을 위한 휴대 단말 실감 인터페이스

한병길,김승찬,권동수,최태용,김휘수,경진호,김두형 제어·로봇·시스템학회 2020 제어·로봇·시스템학회 논문지 Vol.26 No.12

. In this paper, we propose a novel three-dimensional interaction system based on a shape-changeable mobile interface. We utilize multiple serially linked line segments to physically collocate virtual objects in real space. More specifically, the proposed system provides users with geometric information by physically enclosing the target virtual object with its outer shape. To this end, we further propose an algorithm that controls each joint of the system, such that the corresponding links are aligned with the virtual surface, based on an active-contour model. An experiment was conducted to verify the proposed interaction scheme, wherein geometric information was provided in the form of mechanical shape change of the interface. Our experimental results indicate that the proposed method is effective as a system for interacting with 3D virtual objects, provided that only a mobile interface is used.

Real-Time License Plate Detection in High-Resolution Videos Using Fastest Available Cascade Classifier and Core Patterns

한병길,이종택,임길택,정윤수 한국전자통신연구원 2015 ETRI Journal Vol.37 No.2

We present a novel method for real-time automatic license plate detection in high-resolution videos. Although there have been extensive studies of license plate detection since the 1970s, the suggested approaches resulting from such studies have difficulties in processing high-resolution imagery in real-time. Herein, we propose a novel cascade structure, the fastest classifier available, by rejecting false positives most efficiently. Furthermore, we train the classifier using the core patterns of various types of license plates, improving both the computation load and the accuracy of license plate detection. To show its superiority, our approach is compared with other state-of-the-art approaches. In addition, we collected 20,000 images including license plates from real traffic scenes for comprehensive experiments. The results show that our proposed approach significantly reduces the computational load in comparison to the other state-of-the-art approaches, with comparable performance accuracy.

인유(人乳) 흡인 백서의 폐포 대식세포에서 Lactalbumin에 대한 면역세포화학적 연구

한병길,정용헌,Han, Byoung Kil,Chung, Young Hun 대한소아청소년과학회 2003 Clinical and Experimental Pediatrics (CEP) Vol.46 No.6

목 적 : 인유를 탐식한 폐포 대식세포는 면역세포화학 반응에 관여하며, 기존의 염색법에서보다 면역세포화학기법에 의해 잘 관찰될 수 있음을 규명하여, 인유 흡인을 확인할 수 있는 진단에 활용하고자 본 연구를 시행하였다. 방 법 : 총 64마리의 백서를 대상으로 소량(0.05 mL)의 모유를 코를 통하여 기도에 흡인시킨 후 지정 시간별로 기관을 도관한 다음, 기관지폐포 세척을 실시하여 얻은 세포에 대하여 면역세포화학적 염색과 Oil Red O 염색을 실시하고 폐포 대식세포들의 탐식 정도를 관찰하였다. 결 과 : 인유 흡인 2시간 후에 Lactalbumin에 대한 양성 대식세포가 관찰되었으며 8시간에 최고이었고 24시간에 감소하였으며 48시간에도 양성 대식세포가 관찰되었다. 그러나 Oil Red O 염색에서 폐포 대식세포들의 검출률은 미미하였다. 결 론 : 본 실험의 결과는 소량의 인유 흡인을 면역세포화학적 기법에 의하여 기관지폐포 세척 액에서 검출할 수 있다는 것을 시사하는 것이었다. Purpose : Aspiration of foreign material into the lungs can cause acute or chronic pulmonary diseases. It is difficult to detect small amounts of aspiration due to the lack of safe, sensitive and specific diagnostic tests. Recently, in animal or human studies, it has been reported that immunochemistry for lactalbumin can be used to detect the minimal aspiration. So, the authors' investigation was designed to determine whether human milk phagocytized alveolar macrophages can be detected in human milk aspirated mice. Methods : Sixty four male mice, 6-8 weeks old and 30-40 gm weighing, were used for this study. About 0.05 mL of human milk or normal saline were given intranasally once per day for 1 day or 3 days. Under anesthesia with ketamine and xylazine, the trachea of each mouse was cannulated with an 18G Jelco needle and then, each mouse's lungs were lavaged three times with 0.5 mL of phosphate buffer solution at 2, 8, 24, and 48 hours after the last milk or normal saline instillation. Cells in bronchoalveolar lavage fluid were stained with Oil Red O and immunocytochemistry for alpha-lactalbumin. Results : Immunocytochemical reactivity for alpha-lactalbumin or lipid-laden alveolar macrophages were not observed in the normal saline aspirated groups. Immunocytochemical reactivity for alpha-lactalbumin were observed in the human milk aspirated groups. They showed a peak at 8 hours and decreased markedly at 24 hours but persisted even at 48 hours after aspiration. Immunocytochemical stain positive alveolar macrophages were noted similarly in number between single and multiple aspiration groups. Conclusion : These observations suggested that alveolar macrophages for lactalbumin could be more easily detected on immunocytochemistry than Oil Red O stain, and immunocytochemistry could be used as a sensitive and specific diagnostic test for the detection of human milk aspiration.

다중 시점 RGB 영상의 심층 합성곱 신경망 기반 3차원 형상 추정 방법

한병길,박종우,서현욱,송성혁 제어·로봇·시스템학회 2022 제어·로봇·시스템학회 논문지 Vol.28 No.7

In this paper, we describe point cloud generation method from multiple RGB images based on convolutional neural network. The proposed method is motivated from human’s 3d understanding from orthographic sketches, which infer spatial relationship from front, top, side view of the 3d object. The network of the proposed method employed generative model, to make it predict point clouds of atypical objects. Auto encoder network is utilized to encode three RGB images into latent vectors, and generate point clouds. Loss functions are defined which measure reconstruction performance and uniformity of the point clouds to make the network generate point clouds similar to the original and distribute uniformly along entire region. From this structure, we expected the network to learn spatial relation of the original 3d model from multiple RGB images. The result shows that the proposed method can predict overall shape of the objects, and it is hard to express detailed geometry. As a further work, network structure improvement to generate detailed shape of the object, predict occluded region will be performed. .

실시간 응용을 위한 안드로이드 플랫폼에서의 안면 검출 시스템 구현

한병길,임길택 대한임베디드공학회 2013 대한임베디드공학회논문지 Vol.8 No.3

This paper describes an implementation of face detection technology for a real-time application on the Android platform. Java class of Face-Detection for detection of human face is provided by the Android API. However, this function is not suitable to apply for the real-time applications due to inadequate detection speed and accuracy. In this paper, the AdaBoost based classification method which utilizes Local Binary Pattern (LBP) histogram is employed for face detection. The face detection module has been developed by C/C++ language for high-speed image processing, and this module is included to the Android platform using the Java Native Interface (JNI). The experiments were carried out in the Java-based environment and JNI-based environment. The experimental results have shown that the performance of JNI-based is faster than Java-based method and our system is well enough to apply for real-time applications.

방사형 MVDC 배전계통에서 사고구간 분리를 위한 클램핑 장치의 동작 특성에 관한 연구

한병길(Byeong-gill Han),이후동(Hu-Dong Lee),김지명(Ji-Myung Kim),김경화(Kyung-Hwa Kim) 전력전자학회 2021 전력전자학술대회 논문집 Vol.2021 No.7

본 논문에서는 방사형 MVDC 배전계통에 대하여 전력변환 장치의 탈락을 방지하기 위해, 사고전류를 제한할 수 있는 MVDC용 사고전류 클램핑 장치로 제시한다. 이 장치는 주 통전부와 전류 클램핑부, 등으로 구성하고, 반도체 소자를 채용하여 수 ㎲이내에 빠르게 동작하여 사고전류를 제한하는 기능을 가진다. 또한, 전류 클램핑 장치의 설치 및 운용방안은 간선용 메인컨버터의 직하와 지선용 구간 컨버터의 직하로 분류되며, 전류 클램핑 장치의 동작 메커니즘은, 초기 동작모드, 예비 동작모드, 주 동작모드, 회복 동작모드의 4가지 모드로 나눌 수 있다. 한편, PSCAD/EMTDC를 이용하여 사고전류 클램핑 장치의 모델링을 수행하여 보호협조 특성을 분석한 결과, 지선용 구간 컨버터 선로에서 사고가 발생한 경우, 해당지선의 보호기기가 동작할 수 있는 시간을 확보하여, 메인 컨버터의 탈락을 방지하고 사고구간을 분리할 수 있어서, 본 논문에서 제안한 MVDC용 사고전류 클램핑 장치가 유용함을 알 수 있었다.

포곡식 부소산성 축성의 다양성

한병길(Han, Byung-Geel) 한국상고사학회 2007 한국상고사학보 Vol.55 No.-

초창기로부터 지금에 이르기까지 고고학은 패턴을 찾아 유사한 것까지 분류하는 것을 기본으로 하고 있지만, 형식분류가 적용되지 않는 사례가 있다. 패턴을 만들어내야 했던 기존의 연구에서 벗어나 발굴조사된 10개 성벽구간의 축성법을 축기, 체성, 부대시설로 구분하여 비교분석한 결과, 포곡식 부소산성에서 동일한 형태와 규모의 구간은 없었다. 축성 이전에 백제 조정에서 부소산 주변의 지세와 여건을 감안하여 축성규식을 마련해 성역소에 내려주었으나, 축성과정에서 당시의 지세와 처해있는 맥락에 따라 담당고을 고유의 축성전통과 그때그때 축성 감관과 역군의 에이전시가 개입되어, 규식과 달리 구간마다 다소 다양하게 축조된 것으로 보인다. 성벽은 그동안 판축토루라고 알려져 왔지만, 토축을 위주로 하되 석축하기도 하고 토축과 석축의 방식도 구간마다 다소 다르다. 성벽의 너비는 510cm내외~1135cm이상으로 다양하고, 축기의 너비도 360cm이상~1050cm이상으로 다소 유동적이거나 생략되었다. 체성의 너비는 500cm~690Cm로 다소 달랐고, 내측보축은 340cm와 500cm로 축조되거나 생략되었다. 배수로는 너비 30~120cm로 융통성있게 시설되거나 생략되었고, 외측보축도 너비 180cm이상~400cm이상으로 다소 다르게 부가되거나 생략되었다. 세장방형의 석축과 장방형의 토축으로 설치된 치도 규모와 축성방식이 다르다. 체성외측에 일정한 너비로 구를 파고 목주를 세워 축조하는 것이 규식이되 체성내외측에, 체성중에만, 치성외측에 55~130cm로 다양하게 파기도 하고 생략하기도 했다. 지금 25cm내외와 40cm내외의 목주를 간격 130cm내외로 세우는 것이 규식이되, 지름 20~35cm와 45~50cm의 목주도 간격 100~160cm로 불규칙하게 세워졌다. 지름 20cm내외와 25cm내외의 횡장목, 15cm내외와 20cm내외의 종장목을 간격 130cm내외로 목주와 가구시키는 것이 규식이되, 횡장목은 20~22cm와 25~30cm의 각목과 원목, 종장목은 15cm와 20~25cm의 원목을 간격 120~130cm로 불규칙하게 설치하거나 생략한 것으로 보인다. Though archaeology has taken as its basis putting together similar things for classifying patterns, there have been cases in which such typological method could not be applied. As a result of the comparison and analysis of the techniques used in the fortification of 10 excavated rampart blocks according to the differences in ground layout, ramparts, and additional structures, we can find out that in the valley encircling type fortification of Busosanseong, every block is different in form and scale. It seems that though the Baekje government dictated the established rule for fortification to the command post considering the topography and circumstances of the Mt. Buso area, in actuality each block was constructed in various ways according to the inherent tradition of each county in charge and agency of supervisors and workmen being interfered with encountering topographical and/or contextual variations. The wall of Busosanseong was known to have been constructed by earthen filing technique, but some sections were constructed either by the earthen filing of stone accumulating technique, though the former was practiced as the main technique. Accordingly width of different sections of the wall are varied in between about 510cm and more than 1135cm. In relation with this, the width of the ground layout also varies in between 360cm and more than 1050cm. The width of the rampart varies in between 500cm and 690cm, and the width of its inside additions varies in between 340cm and 500cm, or omitted in some section. The width of water outlets ranges in between 30 and 120cm or omitted in some locations, and the width of outside additions ranges in between 180cm and more than 400cm, or partly omitted. The bastions, which were formed by stone as well as earthen filing, also show similar variations in scale and fortification methods. Despite the construction rule of log hole digging in a regular width on the outside of the rampart, hollows were dug in the width of 55-130cm on either the inside and outside of, or even in the middle of the rampart, or even omitted. Furthermore, despite the rule requiring pole logs of 25cm and 40cm in diameter that mush be set up at 130cm interval, the logs used are 20-35cm and 45-50cm in diameter, and were set up irregularly at the interval of 100-160cm. And the rules ordered that crossway-long logs of about 20cm and 25cm in diameter and length-long logs of about 15cm and 20cm in diameter must be assembled with pole logs at intervals of about 130cm, the crossway-long logs of 20-22cm and 25-30cm in diameter, and the length-long logs of 15cm and 20-25cm in diameter were used. And they were constructed irregularly at intervals of 120-130cm or omitted.

PSCAD/EMTDC를 이용한 ±35kV급 MVDC 실증 배전망의 모델링 및 사고특성에 관한 연구

한병길(Byeong-Gill Han),이후동(Hu-Dong Lee),김지명(Ji-Myung Kim),최성문(Sung-Moon Choi),노대석(Dae-Seok Rho) 한국산학기술학회 2022 한국산학기술학회논문지 Vol.23 No.4

최근, 신재생에너지전원의 급격한 도입으로 인한 계통접속 지연 문제를 해결하기 위한 방안으로, MVDC 배전기술에 대한 실증연구가 활발하게 진행되고 있으며, 특히 기존의 AC 배전선로를 활용하여 MVDC 배전망을 구성하는 경우, MVDC ±35kV의 전압이 적정한 것으로 평가되고 있다. 그러나, 이 전압은 기존 AC 배전망의 공급전압보다 높아 MVDC 배전망에서의 전체 사고전류를 크게 증가시킬 수 있으므로, 선로 및 주요설비들을 보호하기 위하여 정확한 사고 특성의 해석이 요구되고 있다. 따라서, 본 논문에서는 MVDC 배전망의 실증을 위해 구축 중에 있는 ±35kV급 MVDC 배전계통을 대상으로 사고특성을 분석하기 위하여, 배전계통 상용 해석 프로그램인 PSCAD/EMTDC를 이용하여 배전용변전소, AC 및 DC 배전선로, 컨버터스테이션, 태양광전원으로 구성된 ±35kV급 MVDC 배전계통의 모델링을 제시한다. 이 모델링과 다양한 상정사고 조건을 바탕으로 ±35kV급 MVDC 배전계통에서의 사고해석을 수행한 결과, 사고 지점 및 종류에 따른 사고특성을 정확하게 평가할 수 있어서, 본 논문에서 제시한 모델링이 MVDC 배전계통의 사고해석에 유용함을 확인하였다. Recently, demonstration projects for a medium voltage direct current (MVDC) distribution system have been carried out as an alternative to overcome the interconnection delay issues of PV systems. When applying existing AC devices and cables to MVDC distribution systems, a voltage of MVDC 35kV has been considered appropriate. However, this voltage is higher than AC 22.9 kV and can significantly increase the overall fault current in the MVDC distribution system, so a proper analysis of fault characteristics is required for the protection of cables and devices. Therefore, this paper proposes a model of a ±35-kV-scale MVDC distribution system, which is composed of a distribution substation, AC and DC distribution feeder, converter station, and PV system. The model was made using PSCAD/EMTDC S/W in order to evaluate the characteristics of fault in the system. Simulations of fault analysis were done based on the proposed model with several fault scenarios, and the results confirmed that fault characteristics can be accurately evaluated depending on the fault types and scenarios.

굳기 정보 표현을 위한 모바일 햅틱 인터페이스

한병길(Byung-Kil Han),김승찬(Seung-Chan Kim),표동범(Dongbum Pyo),임종관(Jong Gwan Lim),서지원(Jiwon Seo),조정훈(Jeonghun Cho),권동수(Dong-Soo Kwon) 한국HCI학회 2013 한국HCI학회 학술대회 Vol.2013 No.1