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격벽형 전자종이의 하전입자 필터링 방법 및 구동조건에 따른 응답시간 및 반사율 분석
이주원,김영조,Lee, Joo-Won,Kim, Young-Cho 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.6
For electronic paper displays using electrophoresis, the response time and reflectivity of the image panel fabricated by filtering are analyzed. For the filtering process, a square wave and ramp wave are applied to white charged particles with a unique q/m value. We divide the sample panels into #1 to #4 according to the applied waveform in the filtering process. Step waves comprising two steps are used to drive the panel; therefore, we divide the driving conditions into D1~D4. The applied voltage at the first stage of the half cycle of the driving waveform moves the charged particles attached via the image force from the electrode, and the applied voltage at the second stage moves the floating charged particles by detaching. As mentioned, four types of driving conditions (D1 to D4) classified according to the half cycle of the driving waveform are applied to the samples #1 to #4), which are classified according to four types of filtering process. When driving condition D1 is applied to the four types of sample panels, the rise time of #1 is 1.59s, #2 is 1.706s, #3 is 1.853s, and #4 is 1.235s, resulting in #4 being relatively faster compared with other sample panels, and showing the same trend in other driving conditions. As a result, we confirm that applying the driving condition D1 causes abrupt movement of the white charged particles injected into the cell. When the same driving waveform (D1) is applied to each sample, reflectivities of 32.1% for #1, 31.4% for #2, 27.9% for #3, and 63.4% for #4 are measured. From the experiment, we confirm that the driving condition D1 (1s of 3.5 V, 9s of 3.0 V) and ramp wave #4 in filtering are desirable for good reflectivity and response time. Our research is expected to contribute to the improvement of the filtering process and optimization of the driving waveform.
허주희(Joo Hee Huh),김영조(Young Jo Kim),박재기(Jae Ki Park),이성구(Sung Koo Lee),이중기(Choong Ki Lee),정태훈(Tae Hoon Jung) 대한내과학회 1991 대한내과학회지 Vol.40 No.4
N/A To evaluate the usefulness of some spirometric parameters which reflect the airway resistance indirectly, the volume, flow and time parameters in forced expiratory volume and maximal flow volume curve and airway resistance measured by a body plethysmography were compared among healthy nonsmokers, healthy smokers and patients with chronic obstrcuctive pulmonary disease. There was no significant difference between smokers and nonsmokers in airway resistance but markedly increase in patients with chronic obstructive pulmonary disease. Specifir conductance (SGaw) and log SGaw known to be more specific in assessing airway resistance correlated as follows: FEV0?5, and FEV₁, in volume parameters, FEF25% and PEF in flow parameters and FET25~75% in time parameters. FET25~75% had the most significant correlation. These facts suggest that the FET25~75% is a simple and more accurate screening test for early detection of increased airway resistance.
전기영동형 전자종이 디스플레이에서 전자잉크의 주입 방법 및 구동파형에 따른 전류 특성 분석
이주원,김영조,Lee, Joo-Won,Kim, Young-Cho 한국전기전자재료학회 2020 전기전자재료학회논문지 Vol.33 No.5
In this study, the drift current characteristics of charged particles are analyzed for panels fabricated by varying the waveform biasing of the active particle loading method (APLM), which is a method driven by the electrophoretic principle of loading charged particles into a cell of a barrier rib-type electronic paper. We prepare 3 panels using APLM and 1 panel without APLM. The waveform of APLM uses square wave and ramp wave, and the step voltage wave is applied to the driving voltage. The drift currents measured from the square wave and ramp wave with the same period applied by APLM are 4.872 µC and 5.464 µC, respectively, and the ramp wave is shown to be relatively advantageous for loading charged particles that have a large q/m. The time-current curve results confirm that the abrupt movement of charged particles is occurring. When the step form wave signal with a short time of 1s is first applied, initial large movement of the charged particles is confirmed to occur in all samples, which is understood as the effect of applying the voltage necessary to remove the imaging force. The results of this study are expected to improve the loading of charged particles into the electronic paper cell, driven by the electrophoretic principle and optimization of the driving conditions.
천병렬,김권배,김기식,김영조,김윤년,김창윤,박의현,신동구,심봉섭,이종주,이충원,장성국,전재은,Chun, Byung-Yeol,Kim, Kwon-Bae,Kim, Kee-Sik,Kim, Young-Jo,Kim, Yoon-Nyun,Kim, Chang-Yoon,Park, Wee-Hyun,Shin, Dong-Gu,Shim, Bong-Sub,Lee, Jong-Joo,L 대한예방의학회 1998 Journal of Preventive Medicine and Public Health Vol.31 No.3
To estimate the incidence rate of coronary heart disease in Korea, of all residents in Taegu city aged 25 or above, those who had an acute MI or a fatal coronary event between 1 July 1996 and 30 June 1997 were registered. Seven hundreds and eight patients were registered during the study period(685 were identified at hospital and 23 were autopsy cases). Age-standardized annual incidence rate of men in city area was 93 per 100,000(95% CI; 61-142) and 35% CI; 16-67) in women(100 in men and 20 in women aged 35-64). The incidence was rapidly increased after age 40 in men, however, in women after age 60. Twenty-eight-days case fatality rate was 45% in men and 47% in women. However, in the age group of 45-59 case fatality rate in women was two times higher than that in men. In conclusion, crude annual incidence rate of CHD in city area was 73 per 100,000 in men and 33 in women. The age-standardized annual incidence of CHD in men(93 per 100,000) was 2 times higher than that in women (33 per 100,000) in Korea.
천병렬,김권배,김기식,김영조,김윤년,김창윤,박의현,신동구,심봉섭,이종주,이충원,장성국,전재은,조용근,채성철,최지용,하영애,이영숙 경북대학교 의학연구소 1999 경북대학교병원의학연구소논문집 Vol.3 No.1
To estimate the incidence rate of coronary heart disease in Korea, of all residents in Taegu city aged 25 or above, those who had an acute MI or a fatal coronary event between 1 July 1996 and 30 June 1997 were registered. Seven hundreds and eight patients were registered during the study period(685 were identified at hospital and 23 were autopsy cases). Age-standardized annual incidence rate of men in city area was 93 per 100,000(95% CI; 61-142) and 33(95% CI; 16-67) in women(100 in men and 20 in women aged 35-64). The incidence was rapidly increased after age 40 in men, however, in women after age 60. Twenty-eight-days case fatality rate was 45% in men and 47% in women. However, in the age group of 45-59 case fatality rate in women was two times higher than that in men. In conclusion, crude annual incidence rate of CHD in city area was 73 per 100,000 in men and 33 in women. The age-standardized annual incidence of CHD in men(93 per 100,000) was 2 times higher than that in women (33 per 100,000) in Korea.
이하부에 발생한 침습성 섬유종증이 하악체에 침범한 증례 보고
민승기,김영조,정창주,김은철,이동근,엄인웅 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.2
Fibromatosis is benign fibroblastic proliferative lesion with abundant collagenous neo-formation located principally in the abdominal wall and in the upper and lower extremities (Masson & Soule, 1966). Wilkins and Waldron, in 1975, suggested that the title aggressive fibromatosis was a more appropriate term, relfecting the invasive characteristics of the disease. Synonyms listed were extra-abdominal desmoid, juvenile fibromatosis, aggressive infantile fibromatosis and congenital fibrosrcoma. A total of 12% of all fibromatosis arise in head and neck. Fibromatosis of the oral cavity is uncommon and is even more rare when in involve the mandibule. It is a locally aggressive fibrous tissue tumor, generally does not metastasize, but may cause consideralbe morbility nd even death due to local infiltration. The degree of microscopic celluarity is vrialbe, not only from tumor to tumor but also from area to rea in the same tumor. Some tumors present with prolifertion of mature fibroblasts and a dominating collagenous component: others may show a lack of the tumor in both types. The common histologic denominator appears to be celluar interlacing bundles of elongated fibroblasts, showing little or no mitotic activity and no pleomorphism. Mitosis are not a consistent index of malignancy when found in younger age groups. Fibromatosis still posses difficult problems of diagnosis and treament. It is frequently recurrent and inflitrates neighbouring tissues. These lesion inflitrate widely and replce muscle, fat, and even bone with fibrous tissue of varying cellularity. Lesion representing fibromatosis in the oral cavity must be carefully evaulated by both surgeon and pahtologists to ensure proper diagnosis and treatment planning. When these lesions involve bone, surgeon must be aware of the lesion's potential to perforate the cortex and expand while remaining hidden from the surgeon's view. Careful and precise clinical correlation with histologic appearance is essential to preclude misdiagnosis of fibroscrocma yet provide sitrgical treatment plan that provides adequate local excision and long-term follow up.As regards cause,little is known. It is attribufed to trauma or alteration in the sex hornone(Carlos,et al,1986).Clinially,the lesion is reported to be not painful in most cases,but capable of rapid growth. The treatment is essentially surgical excision with wide margin of adjacent uninvolved tissue.Radiotherapy,hormone treatment or chemotherapy are of no use (Wikins et al,1975:Majumudar and Winiarkl,1978). We report a case of aggressive fibromtosis of 15-year-old with a lesion in the soft tissue of the parotid area that invaded the underlying bone of the mandibular body.
정창주,진국범,이동근,윤성필,김귀희,김영조 大韓顎顔面成形再建外科學會 1994 Maxillofacial Plastic Reconstructive Surgery Vol.16 No.1
The functional deformity following removal of the maxilla is considerable, especially following maxilla cancer excision. Rehabilitation of oral and maxillofacial region used to be very difficult with prosthesis or traditional flaps. Temporal muscle and fascia flaps have been described for immediate reconstruction following hemi-maxillectomy, but not total maxillectomy. The muscle and superficial fascia of the temporal area differ in their physical characteristics, vascular supply and clinical applications. Both can be employed independently or simultaneously as regional flaps in the reconstruction of a variety of complex craniofacial defects. Four case is presented in which 3 case maxilla cancer, one case non-union after maxilla fracture, and all case showed successful use of this flap. Only one patient developed partial necrosis of the flap ; significant necrosis did not occur in any other patient. This present paper reviews the anatomy, surgical technique and utilisation of temporal muscle and fascia flaps.