두개강내 원발성 흑색종

백재민,최기환,박재복 대한신경외과학회 1991 Journal of Korean neurosurgical society Vol.20 No.10-11

본 교실에서는 중추 신경계에 매우 드물계 발생하는 종양인 원발성 악성 흑색종 1례를 진단 치험하였기에 문헌 고찰과 함께 보고 하는 바이다. The primary malignant melanoma arising in the leptomeninges of the central nervous system is extremely rare. We report a case of malignant melanoma, apparently thought to be originated from leptomeninges, with diffuse neoplastic process widely spreaded over the leptomeninges of 42 years old man, who had suffered severe headache, nausea and left hemiparesis. This patient is free of the symptoms for six months after operation. The literature on this subject is briefly reviewed.

로봇 매니퓰레이터를 위한 적분형 슬라이딩 매니폴드를 가진 광범위한 시간지연 제어 알고리즘

백재민,강민석,윤경수 대한기계학회 2023 大韓機械學會論文集A Vol.47 No.5

본 논문은 로봇 매니퓰레이터에 적용할 수 있는 적분형 슬라이딩 변수 기반 광범위한 시간지연 기법을 제안한다. 제안된 제어 알고리즘은 불가피하게 요구되는 시간지연 제어 기법의 안정성 기준에 위배되더라도 항상 로봇 매니퓰레이터의 안정성을 보장할 수 있고, 시간지연 추정 방법을 활용하기 때문에 로봇 매니퓰레이터에 대한 속성 정보를 필요로 하지 않는다. 게다가, 이 기법에서 사용된 적분형 슬라이딩 변수는 슬라이딩 단계에서 가장 많이 사용되는 1계 슬라이딩 변수보다 높은 수렴 속도를 보장할 수 있으며, 로봇 매니퓰레이터의 강인성을 향상시킨다. 제안된 기법에 대한 효과는 2축 평면 로봇 매니퓰레이터에 근간을 둔 시뮬레이터에서 분석되었고, 그것은 잘 알려진 광범위한 시간지연 기법의 성능과 비교하여 검증되었다.

급성 자발성 경추 경막외 혈종 1례 : Case Report

백재민,정훈,최기환,여형태,이정길 대한신경외과학회 1991 Journal of Korean neurosurgical society Vol.20 No.6

Spontaneous spinal epidural hematoma is a rare cause of spinal cord compression. Recently, at our hospital, the author et al had the opportunity of observing case with spontaneous cervical epidural hematoma in a 28 years old woman who had suddenly felt a strong pain in interscapular area. Rapidly after she noticed weakness in her legs and one day later she was completely paraplegia. The MRI of spine was done. There show tubular like low signal intensity at posterior epidural space of C_(7) level due to cord compression effect. In this article, we are adding one more rare case of spontaneous cervical spinal epidural hematoma confirmed by MRI.

Antioxidant and Cholinesterase Inhibitory Activities of Aqueous Extract from Rainbow Trout Oncorhynchus mykiss

백재민,윤나영,김연계,이두석,윤호동,박정숙 한국수산과학회 2011 Fisheries and Aquatic Sciences Vol.14 No.2

We investigated the antioxidant and cholinesterase inhibitory activities of the aqueous extract of rainbow trout Oncorhynchus mykiss. The antioxidant activity of O. mykiss aqueous extract was determined by in vitro peroxynitrite scavenging activity and reducing power assays. The aqueous extract of O. mykiss showed potent peroxynitrite radical scavenging activity (IC_(50)=0.12±0.001 mg/mL) and reducing power (absorbance=0.47±0.001) at the concentration of 1 mg/mL. The in vitro cholinesterase inhibitory activity of O. mykiss aqueous extract was examined using spectrophotometric analyses of acetyl- and butyrylcholinesterase. The aqueous extract of O. mykiss showed acetylcholinesterase inhibitory activity (IC_(50)=1.61±0.13 mg/mL), but did not exhibit inhibitory activity against butyrylcholinesterase. These results suggest that O. mykiss possesses antioxidant and acetylcholinesterase inhibitory activities and provide scientific evidence for the health benefits of O. mykiss aqueous extract.

붉은쏨뱅이 (Sebastiscus tertius) 피부계의 미세구조 및 조직화학적 특징

백재민,김철원,임상구,이제봉,이정식,Baek, Jae-Min,Kim, Chul-Won,Lim, Sang-Gu,Lee, Jae-Bong,Lee, Jung-Sick 한국현미경학회 2004 Applied microscopy Vol.34 No.2

Integumentary structures of the rockfish, Sebastiscus tertius were examined by means of the light and transmission electron microscopy. Stratified epidermal layer consists of supporting cells, unicellular glands, granular cells and mitochondria-rich cells. The epidermal layer could be classified into superficial, intermediate and basal layer by morphology and structure of the supporting cells. Mucous cells of unicellular gland were observed in the superficial and intermediate layer of the epidermis. The mucous materials were identified as acidic and carboxylated mucosubstance by histochemical methods. Club cell has well-developed central vacuole, rough endoplasmic reticula and Golgi complex in the cytoplasm. Granular cells were observed in the superficial layer and contained numerous granules of high electron density. Mitochondria-rich cells are characterized by well-developed microfilaments in cortex and numerous tubular mitochondria in medullar cytoplasm. Three types of pigment cells in the dermal layer could be distinguished with electron density of cytoplasmic inclusions. 붉은쏨뱅이의 피부 상피층은 다층상피층으로 지지세포, 선세포, 과립세포 그리고 mitochodria-rich cell들로 구성된다. 상피층은 지지세포의 형태와 구조에 따라 표면층, 중간층 및 기저층으로 구분할 수 있다. 점액세포들은 단세포선으로 상피의 표면층과 중간층에 분포하며, 산성의 비황화 뮤코다당류로 구성된 점액을 가진다. 곤봉상세포는 세포질에 잘 발달된 중심공포, 조면소포체 및 골지체를 가진다. 과립세포는 표면층에 존재하며, 전자밀도가 높은 과립을 가진다. mitochodria-rich cell의 주변부 세포질에는 미세섬유 다발이 발달되어 있으며, 수질부에는 다수의 관상 미토콘드리아를 가진다. 색소세포는 세포질에 존재하는 함유물의 전자밀도에 따라 세 종류로 구분할 수 있다.

로봇 매니퓰레이터에 적용을 위한 유한한 시간 적응 비특이 터미널 슬라이딩 모드 제어 기법

백재민,윤경수,강민석,Baek, Jae-Min,Yun, Kyeong-Soo,Kang, Min-Seok 대한임베디드공학회 2021 대한임베디드공학회논문지 Vol.16 No.4

We propose an adaptive non-singular terminal sliding-mode control for the fast finite-time convergence (FANTSMC) in robot manipulator. The proposed FANTSMC approach is developed to be applied without singularity in robot manipulator, which has a new pole-placement control with the non-singular terminal sliding variable while generating the desirable control torque. Moreover, the switching gain is designed to suppress the time-delayed estimation error appropriately, which aims at providing the high robust tracking performance. Also, the proposed one employs one-sample delayed information to cancel out the system uncertainties and disturbances. For these reasons, it offers strong attraction within the finite time. It is shown that the tracking performance of the proposed FANTSMC approach is guaranteed to be uniformly ultimately bounded through the Lyapunov stability. The effectiveness of the proposed FANTSMC approach is illustrated in simulations, which is compared with that of the up-to-date control approach.

로봇 메니퓰레이터에 비특이 터미널 슬라이딩모드를 사용한 적응 시간지연 제어 기법

백재민,백형부 제어·로봇·시스템학회 2019 제어·로봇·시스템학회 논문지 Vol.25 No.10

This paper describes an adaptive time-delayed control approach with a non-singular terminal sliding-mode technique (ATDC-NTS) that is proposed for obtaining fast response and high tracking performance in robot manipulators. The proposed ATDC-NTS uses one-sampled delayed measurements to cancel the uncertainties and the unknown disturbances generated by the robot manipulators. The proposed method uses an adaptive sliding-mode control for not requiring the stability criteria inherent in the time-delayed control (TDC), and hence, the magnitude of the control gains used in ATDC-NTS is not restricted unlike that used in the existing TDC-based control approaches. In addition, as the proposed ATDC-NTS is based on the non-singular terminal sliding-mode technique, it provides strong attractivity while approaching the reference points within the finite time. The simulation results showed that the proposed ATDC-NTS had high tracking performance as compared to the existing control approach.

해조류 양식 산업의 현황과 전망

백재민 동아시아식생활학회 2007 동아시아식생활학회 학술발표대회논문집 Vol.- No.-

조피볼락의 생식주기

백재민,한창희,김대중,박철원,회전귀미,BAEK Jae-Min,HAN Chang-Hee,KIM Dae-Jung,PARK Chul-Won,Aida Katsumi 한국수산과학회 2000 한국수산과학회지 Vol.33 No.5

본 실험은 조피볼락 (Sebastes schlegeli)의 생식년주기와 생식주기에 따른 sex steroid hormone들의 계절적인 변화를 밝히기 위하여 GSI와 HSI의 연간 변동과 생식소 조직학적인 연간 변화와 sex steroid hormone ($estradiol-l7{\beta}, 17{\alpha}, 20{\beta}-dihydroxy-4-pregnen-3-one, testosterone$, 그리고 $11-ketotestosterone$)의 혈중 수준의 연간 변화를 조사하였다. 암컷의 생식주기는 다음과 같이 5단계로 구분할 수 있었다: 1) 회복기 (6월${\~}$9월): 혈중 $estradiol-l7{\beta}$의 수준이 점차 증가 하였다. 2) 난황형성기 (9월~2월): 난모세포의 난황 형성이 관찰되며, GSI 값과 혈중 $estradiol-l7{\beta}$수준이 증가하였다; 3) 임신기 (2월${\~}$4월): 난소내에 발생중인 자어가 관찰되며, 2월에서 3월에 이르러 혈중 $17{\alpha}, 20{\beta}-dihydroxy-4-pregnen-3-one$와 testosterone의 수준이 증가하였다: 4) 출산기 ($4{\~}5$월): GSI 값이 급격히 감소하면서 난소내에는 자어들의 출산된 흔적이 보였다: 5) 휴지기 ($5월$${\~}$7월) GSI값과 혈중 steroid hormone의 수준이 낮은 값을 유지하였다. 수컷의 생식년주기는 6단계로 나눌 수 있었다: 1) 정자형성 초기(4월${\~}$6월): GSI의 값과 혈중 steroid hormone의 수준이 점진적으로 증가하였으며, 정원세포의 포낭이 수가 증가하고 일부의 정모세포의 포낭들도 관찰되었다; 2) 정자형성 중기 (6월${\~}$9월): GSI의 값과 혈중 steroid hormone의 수준이 증가하고 많은 포낭내의 생식세포들이 활발하게 정자형성을 하고 있었다: 3) 정자형성기 후기 (9월${\~}$11월): GSI와 steroid hormone의 수준이 높은 값을 유지하고 있었으며, 정자들이 정세관 내강으로 방출되었다; 4) 정자 방출기 (11월${\~}$12월): 전세관의 내강이 확장되고 이 내강내에는 성숙된 정자들로 가득차 있었다: 5) 퇴화기 (12월${\~}$2월): GSI의 값이 점차로 감소하면서 정모세포의 포낭수도 점차로 감소하였다: 6) 휴지기 (2월${\~}$4월): 정소조직의 변화는 보이지 않았으며, GSI와 steroid hormone의 수준이 낮은 값을 유지하였다. 11월에 정소들의 정세관 내강에 성숙된 정자들로 가득차 있었고 난소내강에 정자괴들이 관찰되는 것으로 보아 이종의 교미시기는 11월과 12월사이라고 할 수 있다. To clarify the annual reproductive cycle in a rockfish, Sebastes schlegeli, monthly changes in gonadosomatic index (GSI), hepatosomatic index (HSI) and histological feature of gonads and plasma levels of sex steroid hormones ($estradiol-l7{\beta},\;17{\alpha},\;20{\beta}-dihydroxy-4-pregnen-3-one,\;testosterone\;and\;11-ketotestosterone$) were investigated. The annual reproductive cycle in females could be divided into 5 periods as follows: 1) recovery period (June to September): serum level of $estradiol-l7{\beta}$ increased gradually; 2) vitellogenesis period (Septemer to february) : vitellogenic oocytes were obsewed, GSI sustained high value, and serum level of $estradiol-l7{\beta}$ increased; 3) gestation period (February-April): developing larva showed in the ovary, and serum levels of $17{\alpha},\;20{\beta}-dihydroxy-4-pregnen-3-one$ and testosterone increased; 4) partrition period (April to May) : larva were delivered, and value of GSI and serum levels of hormones decreased rapidly; 5) resting period (May to June) : value of GSI and serum levels of $estradiol-l7{\beta}$ and testosterone remained low. The annual reproductive cycle in males could be divided into 6 periods; 1) early maturation period (April to June): value of GSI and serum levels of hormones incresed gradually, cyst of spermatogonia incresed in number, and a small number of cyst of spermatocyte was observed; 2) mid-maturation perid (June to September); value of GSI and serum levels of hormones increased, and germ cells in many cysts were undergoing active sperrnatogenesis; 3) late maturation period (September to November) : value of GSI and serum levels of hormones remained high and spermatozoa were released into the lumina of the seminal lobules; 3) spermatozoa dischaging period (Nobember to December) : the lumina of the seminal lobules were enlarged and filled with mature spermatozoa; 4) degeneration period (December to Februauy)i value of GSI decresed and cyst of spermatocyte were decresed in number; 5) resting period (December to April) : no histological changes of testes were observed, and value of GSI and serum levels of hormones remained low. In November, the lumina of the seminal lobules were filled with mature spermatozoa and sperm masses were present in the ovarian cavity. Thus, copulation in this species occurred in November and December.

생분해성 로프를 이용한 대형 갈조류 감태의 이식

백재민,박성욱,황은경 한국수산과학회 2009 한국수산과학회지 Vol.42 No.5

Biodegradable polybutylene succinate (BPS) multifilament were designed to degrade upon disposal by the action of afforestration of Ecklonia cava. Matured thalli of E. cava were collected at Jeju for zoospore collection and the substrate for zoospores were BPS multifilament (12 mm, 500 Td/96). The materials were made as nets of 1 m2 with a cross stripes of 10 cm. The unit biodegradable nets bearing germlings of E. cava was moved into Wando where the place is conducting intensive seaweed cultivation in Korea for 5 months of nursery culture until they grew to 10 cm in length after which the nets were transplanted into the sea bed at Jeju at a depth of 12 m and the algal growth was monitored from May 2007 to December 2008. This is the first instance of using the BPS materials for seaweed afforestation to avoid any environmental problems.