장거리 변복조기의 반이중통신을 위한 RLSD 개선

고재영,정진완,전병실 전북대학교 전자산업개발연구소 1991 전자산업연구 Vol.2 No.-

Nowadays, one of the most important things is data communication equipment, and among them, MODEM the most widely used equipment. In this paper, we proposed a new method for the purpose of compensating RLSD which is unstable because of channel noise of long distance telecommunication line. This method is based on transmitting staring tone at MODEM transmitter, detecting it at MODEM receiver by PLL algorithm.

Pyridine과 2,4-Dinitrochlorobenzene의 반응에 미치는 Micelle의 영향

고광희,유병승 충남대학교 자연과학연구소 1983 忠南科學硏究誌 Vol.10 No.2

The reaction of 2,4-dinitrochlorobenzene with pyridine has been studied and the reaction rates were determined at various temperature. The amounts of the product obtained from the reaction, 2,4-dinitrophenylpyridinium chloride, were determined by reacting aliquots of the reaction mixtures with aqueous alkali and measuring absorbances of the resulting red solution. The effects of surfactants such as cetyltrimethylammonium bromide (CTAB), sodium laurylsulfate (SDS) and Triton X-100 on the reaction rates have been investigated. It was found that all three surfactants speed the reaction, but the effect of CTAB was the greatest. At high concentration of CTAB, the reaction rates become almost independent of〔CTAB〕as substrate binding approaches completion. The thermodynamic parameters for the reaction in the presence of surfactants were evaluated and compared with those in the absence of surfactants.

아래턱뼈 계측을 통한 한국인의 체질인류학적 특징 및 남녀판별함수 분석

허경석,고기석,정한성,강민규,최병영,김희진 대한췌담도연구회 2000 대한췌담도연구회지 Vol.5 No.4

顎矯正術을 받은 顎顔面 寄形患者의 SKELETAL PATTERN의 變化에 關한 硏究

조원표,조병욱,고백진,이용찬 大韓顎顔面成形再建外科學會 1990 Maxillofacial Plastic Reconstructive Surgery Vol.12 No.3

In the treatment of dentofacial deformities, analysis of skeletal pattern, with evaluation of plaster dental case, is essential procedure. This study was based on 20 patients with dentofacial deformity who were admitted to the department of oral and maxillofacial surgery Kngnam sacred heart Hospital during the period of Jan 1989. We studied serial cephalometric radiogarphs of patients (pre-op, postop immediately, postop 6 moth). The obtained results indicates the good resistance of rigid fixation against relapse in orthognathic surgery.

蜂毒藥鍼이 脊髓內 痛症關聯 神經細胞의 活性에 미치는 影響

鄭善喜,李栽東,高炯均,安秉哲,崔道永,朴東錫 경희대학교 동서의학연구소 2001 東西醫學硏究所 論文集 Vol.2000 No.-

In spite of the use of Bee Venom aqua-acupuncture in the clinics, the scientific evaluation of effects is not enough. Bee Venom aqua-acupuncture is used according to the stimulation of acupuncture point and the chemical effects of Bee Venom. The aims of this study is to investigate the analgegic effects of the Bee Venom aqua-acupuncture, through the change of writhing reflex and the change of c-fos in secondary neurons in the spinal cord. Materials and Methods : Pain animal model was used acetic acid method. The changes of writhing reflex of the mice which were derived pain by injecting acetic acid into the abdomen, after stimulating Bee Venom aqua-acupuncture on Chungwan(CV12) were measured. We used Fos immunohistochemical technique to study the neuronal activity in the spinal cord. Results : 1.Expression of c-fos in superficial dosal horn(SDH), nucleus proprius(NP) and neck of dorsal horn(N) on 6~9th thoracic spine decreased significantly at 2.5×10-4g/kg Bee Venom aqua-acupuncture, compared with saline-acetic acid group. 2.The numeral change of Fos-LI neurons on the NP, N, and ventral gray(V) on 6~9th thoracic spine, SDH on 9~11th thoracic spine, and SDH and V on 11~13th thoracic spine decreased significantly at Chungwan(CV12) Bee Venom aqua-acupuncture, compared with saline-acetic acid group. 3.The correlation between the numbers of writhing reflex and Fos-LI neurons in T6-13 segment was statistically statistically significant at Chungwan(CV12) Bee Venom aqua-acupuncture. Conclusion : This study shows that the Bee Venom aqua-acupuncture on Chungwan(CV12) decreases the numbers of Fos-LI neurons. As the analgegic effects of Bee Venom aqua-acupuncture is recognized. Bee Venom aqua-acupuncture treatment is expected for pain modulation. In order to use it in many ways. more researches are needed for the dose and stability of Bee Venom aqua-acupuncture.

γ-선 조사에 의한 연신된 선형저밀도 Polyethylene의 열자극 전류

김영전,이기선,이종규,고병준 충남대학교 자연과학연구소 1986 忠南科學硏究誌 Vol.13 No.2

We observed three TSC peaks at the temperature of 33℃, 42℃ and 58℃ from linear low density polyethylene which had been excited by γ-ray or electric field . Especially further experiment on elongated sample showed that the peak at 42 ℃ increased until the draw ratio reached 200%, but decreased above 200%. These peaks are closely related to the traps of the crystalline, amorphous and crystal interfacial regions. As a result of elongation non-uniformity of molecular chains caused physical cavities at the crystal interfacial region. Therefore the depth of the trap changed and the rate of the release of the carriers were increased. Because of the elongation the splitted phenomena of the lamellae structure of the sample has been suggested by the infrared absorption spectra of the elongated linear low density polyethylene film at the room temperature.

[P275] A case of atypical mycobacterial infection

( Byoung Yong Koh ),( Won Choi ),( Kyoung Geun Lee ),( Ki Bum Myung ),( Seung Hyun Cheong ),( Hyung Jin Hahn ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1

Atypical mycobacteria are abundant in soil and water. These skin infections may be acquired by direct inoculation into the skin or by hematogenous spread from a visceral focus. The clinical and pathological manifestations of the infections were variables. The skin lesions were often resembling panniculitis showing multiple subcutaneous nodules. A 77-year-old man presented with erythematous, infiltrated, and tendered nodules on scalp, forehead, both eyebrows, neck, and trunk. Duration of the lesions was over a month. He had a medical history of peripheral neuritis on taking oral corticosteroid and gabapentin. Two specimens were taken from the forehead and neck. Histologically, the specimen from nodular lesion on the forehead showed inflammatory infiltrates of lymphohistiocytes and large and voluminous macrophages. The specimen form nodular lesion on the neck revealed lymphohistiocytic infiltration and spindle cell transformation of macrophages forming a histoid-like lesions in the dermis. AFB stain was positive for numerous acid-fast bacilli in the dermis. Mycobacterial culture was done and it showed no growth for mycobacterium. He was successfully treated with oral clarithromycin 500mg twice a day for over four months. Here, we report a case of atypical mycobacterial infection.

A case of coexistence of extramammary Paget`s disease and condyloma acuminatum

( Byoung Yong Koh ),( Eun Sun Kwon ),( Kyung Geun Lee ),( Ki Bum Myung ),( Seung Hyun Cheong ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Extramammary Paget’s disease (EMPD) is a rare cutaneous neoplastic condition, which usually affect apocrine gland-bearing skin. The most frequently affected site is vulva, followed by perineal, perianal, scrotal and penile skin regions of older individuals. Condyloma acuminatum (CA) is a human papilloma virus (HPV) associated benign neoplasm, involving mostly anogenital area. To our knowledge, there have been a few reports about simultaneous occurrence of EMPD and other epidermal proliferative diseases so far. A 84-year-old man presented with over 10-year history of erythematous crusted oozing patch on penile shaft and scrotal area and multiple verrucous surfaced papules on right side of scrotal area. Skin biopsy specimens were taken from the two other sites respectively. Microscopic finding from erythematous patch showed Paget cells containing large pleomorphic nuclei with abundant pale cytoplasm in the basal layer of the epidermis. Immunohistochemically, cytokeratin 7 expressions were confined to the cytoplasm of the Paget’s cells. Histological finding from verrucous papule showed focal parakeratosis, marked acanthosis, and slight papilomatosis. On closer examination, koilocytes with irregular nuclei and vacuolated cytoplasm were conspicuous in the epidermis. We report a rare case of coexistence of extramammary Paget’s disease and condyloma acuminatum on scrotal area.

Two cases of generalized herpes simplex infection

( Byoung Yong Koh ),( Eun Sun Kwon ),( Kyung Geun Lee ),( Ki Bum Myung ),( Seung Hyun Cheong ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1

Herpes simplex virus (HSV) is a common human pathogen, causing orofacial and genital infections. Generalized HSV infections have been described in pregnant women, neonates, and with a patient with immunosuppression. These infections usually are a reactivation of a previous HSV infection, characterized by lager size of lesions, deeper ulceration, satellite lesions, longer healing time, and atypical locations. These atypical skin lesions can resemble autoimmune blistering disorders such as bullous pemphigoid. A 73-year old man and a 84-year woman were on ICU care with ventilator for management of pneumonia. Both patients presented with acute onset of multiple tense blisters on erythematous bases on trunk. Histologically, specimens of both patients showed intraepidermal blister, ballooned acantholytic keratinocytes with intranuclear eosinophlic inclusion bodies, and multinucleated keratinocytes. Immunohistochemical stain for HSV-1 antibody was positive for the man. Direct immunofluorescence (DIF) showed no evidence of autoimmune blistering disorders. Herein, we report two cases of atypical manifestation of HSV infection, generalized HSV infection in immucompromised patient on ICU care.

[P348] A case of eccrine porocarcinoma

( Byoung Yong Koh ),( Won Choi ),( Kyoung Geun Lee ),( Ki Bum Myung ),( Seung Hyun Cheong ),( Hyung Jin Hahn ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1

Eccrine porocarcinoma is a rare malignant cutaneous appendageal neoplasm that originates from the intraepidermal eccrine sweat duct. It usually occurs on the pre-existing lesion of benign eccrine poroma. It has propensity to affect the elderly and females. A 57-year old man presented with about 2.0 x 2.0 cm sized verrucous and keratotic nodule with central crateriform ulceration on the left first web space. Histopathological examination revealed cribriform and infiltrating intraepidermal aggregations composed of polygonal or cuboidal malignant cells invading into the dermis. The cells demonstrated conspicuous nuclear atypia with occasional mitosis. Ductal structures are present within the tumor nests. Immunoreactivity for EMA showed positivity within the tumor cells. He was referred to the department of plastic surgery and underwent wide excision and coverage by full thickness skin graft. We report a case of eccrine porocarcinoma