고정/가변 채널 할당 방식의 이동통신 시스템에서 음성과 데이터 트래픽의 성능 분석

김기완,김두용 순천향대학교 부설 산업기술연구소 2000 순천향 산업기술연구소논문집 Vol.6 No.2

We propose the integrated fixed/dynamic channel assignment scheme for cellular mobile communication. Two types of classes are active in the system, and a system is designed to support voice and data services at different arrival rates. The fixed channel assignment scheme for voice and data traffic have a fixed boundary. The dynamic channel assignment scheme have movable boundary. Dynamic channel assignment scheme allows the data traffic to use the voice channel available. But the system can preempt the data traffic using the voicce channels. Whenever it needs the voice channel. In this paper, we compare and analyze the blocking probabilities of data and voice traffics and handoff failure probabilities for both fixed and dynamic boundary schemes in mobile communication systems.

어린이의 식이습관과 치아우식발생과의 상관관계에 관한 연구

김재곤,전철완,이두철,백병주 대한소아치과학회 2001 大韓小兒齒科學會誌 Vol.28 No.2

본 연구는 치아우식 발생과 식이습관과의 상관관계를 알아보기 위하여 전주시내 소재 유치원에 다니는 남아 143명과 여아 124명을 대상으로 유치의 우식경험지수를 조사하고, 어머니로부터 설문조사를 통하여 어머니의 직업유무, 수유경험 및 어린이의 식품기호도 등을 조사한 후 이상의 자료를 분석하였으며, 본 연구에서 나타난 결과들을 중심으로 다음과 같은 결론을 얻었다. 전체 어린이의 유치 우식경험지수는 2.92±1.05이였으며 여아(3.40±1.46)가 남아(2.51±0.97) 보다 다소 높은 우식경험지수를 나타냈으나, 남녀간의 유의한 차이는 나타나지 않았으며(P>0.05), 연령에 따른 유치의 우식경험지수를 비교한 결과, 나이가 증가할수록 높아지는 양상을 보였으며, 3세와 4세에 비해 5세와 6세에서 각각 높은 우식경험지수를 나타냈다(P<0.05). 각 식품군에 대한 기호도에서 남아는 과실류를, 여아는 해조류를 가장 좋아하였으며, 해조류를 제외한 다른 식품군에서 남녀별 유의한 차이를 나타내지 않았으며(P>0.07), 조사 식품군에 대한 어린이의 기호도와 관련한 유치 우식경험지수를 비교한 결과. 당류(r=0.3854, P<005), 유류(r=0.4328, P<0.05), 음료(r=0.2586, P<0.05)에서는 유의성이 인정되었으나, 다른 식품군에서는 유의한 상관성이 인정되지 않았다(P>0.05). The aim of the present study was to analyze relationship between dietary habits and dental caries experience inpreschool children. All 143 boys and 124 girls living in a chonju city were investigated dmf index by dentists through oral examination and dietary habit by children's mothers through questionaires such as infant diets and food preferences. The statistical analysis were performed to evaluate whether variations in dietary habits are related to dental caries experience. The obtained results were as follows; 1. The average dmf index scores of all children were examined 2.92±1.05. The girls had higher than the boys, but no significant differences between the genders were seen the을 index(P>0.05). 2. The higher were their age of children, the higher dmf index was investigated. The dmf index of 5 and 6-yr old childrens was higher than that in 3 and 4-yr old children(P<0.05). 3. No sigificant difference was found between the present of mother's occupation (P>0.05) and type of infant dietary habits(P>0.05). 4. The fruits and sea weeds were showed high degree of preference and fats and vegetables were showed low degree generally. Among 13 food groups, there was no significant difference between boys and girls except for sea weeds(P>0.05). 5. Among 13 food groups, the을 index was positively associated with sugars(r=0.3854, P<0.05), dairy products(r=0.4328, P<0.05) and soft drinks(r=0.2586, P<0.05), and negatively associated with other food groups.

Self-Similar 데이타 트래픽을 갖는 Mobile IP의 모델링

김두용,김기완 순천향대학교 부설 산업기술연구소 2001 순천향 산업기술연구소논문집 Vol.7 No.1

In this paper, we design and analyze the performance of routed optimization Mobile IP with Self-Similar Traffic using computer simulation. Mobile IP provides mobility for hosts connected to the Internet without changing their IP addresses. Generalized extensions of Poisson distribution have been used for modeling Internet traffic of arriving data packets at network. But, recent measurement shows these fluctuations over a wide range of time scales. That effect is called self-similar behavior. Traffic characteristics, α, registration process time, and buffering schemes during a handoff at the foreign agents have an impact on performance which we analyze in terms of average packet loss rate.

肺癌에 있어서 職業과의 關聯性 硏究

김두희,박완섭,손지연,이종영,홍성철 大韓産業醫學會 1995 대한직업환경의학회지 Vol.7 No.2

폐암에 대한 직업의 관련성을 밝히기 위하여 1993년 11월에서 1994년 8월까지 대구 시내 2개 종합병원에 입원하여 병리 조직학적으로 진단된 168명의 폐암 환자와 같은 병동에 있는 내과 환자를 연령군과 성별로 빈도 짝짓기하여 168명의 대조군으로 선정하였다. 직업력과 유해 물질의 폭로력, 거주 환경, 흡연에 관한 정보는 설문지를 통하여 얻었다. 흡연 상태를 보정하고 연령군과 성별에 대한 짝지은 자료에 대하여 직업과 산업 분류에 대한 폐암 발생의 상대 위험은 농업 종사자에서 유의하게 높았고(OR=1.84 ; 95% 신뢰구간 1.16-2.94) 생산직, 가내 수공업, 운수창고통신업, 숙박음식업, 건설업에서도 높게 나타났으나 유의하지 않았다. 그러나 가사(OR=0.31 ; 95% 신뢰구간 0.11-0.89), 관리직(OR=0.22 ; 95% 신뢰구간 0.08-0.61), 공공 행정업(OR=0.23, 95% 신뢰구간 0.08-0.66), 공공 사회및 개인 서비스직(OR=13 ; 95% 신뢰구간 0.03-0.56)에서는 폐암 발생의 상대 위험이 유의하게 낮았으며, 전문직, 도소매업에서도 낮게 나타났으나 유의하지 않았다. 거주 환경에 따른 폐암 발생의 상대 위험은 연탄난로 사용자(OR=3.00 ; 95% 신뢰구간 1.06-8.52)와 농약 사용시(OR=2.14 ; 95% 신뢰구간 1.36-3.37)에 통계학적으로 유의하게 높았고, 공장지대 거주자에서도 높게 나타났다(OR=1.97 ; 95% 신뢰구간 0.92-4.27) 그러나, 중앙집중식난방사용자(OR=0.5 ; 95% 신뢰구간 0.28-0.89)에서는 낮게 나타났으며 통계학적으로 유의하였다. 유해 물질 폭로에 따른 폐암 발생의 상대 위험은 농약(OR=2.07 ; 95% 신뢰구간 1.31-3.26)과 용접 및 흄(OR=10.56 ; 95% 신뢰구간 1.07-103.90)에 폭로시 유의하게 높게 나타났다. 흡연에 의한 폐암 발생의 상대 위험은 비흡연자에 비하여 흡연자(OR=3.98 ; 95% 신뢰구간 1.88-8.45)와, 과거흡연자(OR=4.50 ; 95% 신뢰구간 1.99-10.16)에서 높게 나타났다. 이상의 결과로 비록 흡연이 폐암의 중요한 원인이지만 흡연의 영향을 보정한 후에도 대기오염 및 직업과 폐암과 관련성이 있음을 보여주고 있으며, 앞으로 이러한 직업에서 어떠한 위험 요인이 있는지에 대한 추구가 필요하여 그에 대한 예방 대책을 밝히는 연구가 필요하다. The relationship between occupation and risk of lung cancer was analyzed in hospitalbased case-control study conducted in Taegu on 168 patients with histologically confirmed lung cancer and age group(30-39, 40-49,etc) and sex frequency-matched 168 controls admitted into hospitals for other internal medicine problems. A self adminstered questionnaire was used to obtain occupation, resident environment, smoking histories and specific agent exposure history. The conditional logistic regression was used to estimate oddsratio for age group and sex frequency matched, after controlling for smoking status(non smoker, exsmoker, current smoker) Significant association was observed for farmer[odds ratio(OR), 1.84 ; 95% confidence interval(CI), 1.16-2.94], briquette stove users[OR, 3.0 ; 95% CI, 1.06-8.25], agricultural chemicals users[OR, 2.14 ; 95% CI, 1.35-3.37], and welding/fume exposures[OR, 10.56 ; 95% CI, 1.07-103.90]. Although there were elevated risks associated with production, home industry, transportation/storage/communication, lodgement/food worker and construction, none were statistically significant. The effect of smoking was showed significantly increased risk for exsmoker [OR, 4.50 ; 95% CI, 1.99-10.16] and current smoker [OR, 3.98 ; 95% CI, 1.88-8.45]. As results, although smoking is important risk of lung cancer, occupation and resident environment are showing association of lung cancer. So further evaluation is necessary for occupation risk and take preventive measures.

12-O-Tetradecanoylphorbol-13-Acetate에 의한 HL-60 세포 분화유도중 Vimentin 유전자 전사조절에 대한 AP-1의 역할

임규,김진희,권도원,김승민,이명선,윤경아,손미영,박종일,윤완희,황병두 忠南大學校 癌共同硏究所 1998 癌共同硏究所 硏究誌 Vol.2 No.1

Purpose: To gain insight on the role of AP-1 in transcriptional regulation of vimentin gene during differentiation of HL-60 cells by 12-O-tetradecanoylphorbol-13-acetate (TPA), the levels of vimentin mRNA and AP-1 have been investigated with Northern blot hybridization and DNA mobility shift assay. Materials and Methods: HL-60 cells were grown in RPMI 1640 medium supplemented with 10% heat-inactivated fetal calf serum and antibiotics in a humidified 5% CO_(2) at 37°C. Total RNA was prepared by a modification of the method of Karlinsey et al. Northern blot hybridization was performed by the method of Virca et al. EcoRI fragment of pVIM-GEM was used as probe for vimentin mRNA. DNA mobility shift assay was performed by the method of Lim et al. End labeled DNA probe(Upper strand, 5'-CGCTTGATGAGTCAGCCG- 3') for AP-1 binding activity was mixed with nuclear extracts in a 20 μl reaction volume containing 300 mM KC1, 60 mM HEPES, pH 7.9, 25 mM MgCl_(2), 1 mM EDTA, 1 mM DTT, 60% glycerol, and 2μg of poly[dI-dC]. Results: TPA increased vimentin mRNA levels, with maximal stimulation reached at 24 hr. The level of vimentin mRNA was induced in proportion to the concentration of TPA. TPA-induced vimentin mRNA was almost reduced by actinomycin-D pretreatment. TPA-induced stimulation of vimentin gene was completely reduced by staurosporin pretreatment. In DNA mobility shift assay, AP-1 newly appeared at 24 hr during TPA-induced differentiation and was almost not detected after the pretreatment of staurosporin. Conclusions: These results suggest that the induction of vimentin mRNA during TPA-dependent differentiation in HL-60 cells may be mediated by protein kinases C signal transduction and AP-1 is important to transcriptional regulation.

12-O-Tetradecanoylphorbol-13-Acetate에 의한 HL-60 세포 분화유도중 Vimentin 유전자 전사조절에 대한 AP-1의 역할

임규,김진희,권도원,김승민,이명선,윤경아,손미영,박종일,윤완희,황병두 충남대학교 생물공학연구소 1999 생물공학연구지 Vol.7 No.-

Purpose: To gain insight on the role of AP-1 in transcriptional regulation of vimentin gene during differentiation of HL-60 cells by 12-O-tetradecanoylphorbol-13-acetate (TPA), the levels of vimentin mRNA and AP-1 have been investigated with Northern blot hybridization and DNA mobility shift assay. Materials and Methods: HL-60 cells were grown in RPMI 1640 medium supplemented with 10% heat-inactivated fetal calf serum and antibiotics in a humidified 5% CO_2 at 37℃. Total RNA was prepared by a modification of the method of Karlinsey et al. Northern blot hybridization was performed by the method of Virca et al. EcoRI fragment of pVIM-GEM was used as probe for vimentin mRNA. DNA mobility shift assay was performed by the method of Lim et al. End labeled DNA probe(Upper strand, 5'-CGCTTGATGAGTCAGCCG- 3') for AP-1 binding activity was mixed with nuclear extracts in a 20 μl reaction volume containing 300 mM KCI, 60 mM HEPES, pH 7.9, 25 mM MgCI_2, 1 mM EDTA, 1 mM DTT, 60% glycerol, and 2 ㎍ of poly[dI-dC]. Results: TPA increased vimentin mRNA levels, with maximal stimulation reached at 24 hr. The level of vimentin mRNA was induced in proportion to the concentration of TPA. TPA-induced vimentin mRNA was almost reduced by actinomycin-D pretreatment. TPA-induced stimulation of vimentin gene was completely reduced by staurosporin pretreatment. In DNA mobility shift assay, AP-1 newly appeared at 24 hr during TPA-induced differentiation and was almost not detected after the pretreatment of staurosporin. Conclusions: These results suggest that the induction of vimentin mRNA during TPA-dependent differentiation in HL-60 cells may be mediated by protein kinases C signal transduction and AP-1 is important to transcriptional regulation.

RAW264.7 세포에서 interferon-r 및 LPS에 의해 유도되는 NO생성에 미치는 TALT-35의 영향

박종일,박경석,김종석,박지훈,윤은진,송경섭,서강식,김훈,윤완희,박승길,임규,황병두 충남대학교 생물공학연구소 2006 생물공학연구지 Vol.12 No.-

TALP-35 purified from human term placenta is known to increase microtubule polymerization and stabilize the polymerized microtubule. To examine the effect of TALP-35 on immune system this study was performed. MTT assay was performed to investigate the effect of TALP-35 on the proliferation of RAW264.7 cells. TALP-35 dose dependently suppress the proliferation of RAW264.7 cells at high concentration (above 1 μM) in unstimulated cells, in case of 10 μM TALP-35 treated cells the suppression was 25% but in stimulated cells it was only 15%. Cosedimentation assay was carried out to investigate whether TALP-35 can bind to tubulin of RAW264.7, monocyte/macrophage lineage of mouse, and polymerize it. TALP-35 polymerize the tubulin of RAW264.7 cells and sedimented in dose-dependent manner. To investigate the effect of TALP-35 on the expression of iNOS protein western blotting was performed. The expression level of iNOS was decreased dose dependently in high concentration of TALP-35 treatment. To examine the activity of iNOS, secreted NO was determined by method based on Griess reaction. Interferon-γ and LPS-stimulated production of NO from RAW264.7 cells was decreased dose dependently above 0.1 μM concentration of TALP-35 and 50% is decreased at 10μM of it. This study shows TALP-35 can control cytokine induced-iNOS expression therefore it might control inflammatory diseases.

백서 간재생중 H2B Histone 유전자 발현에 대한 Octamer Binding Transcription Factor의 역할

임규,방재웅,최두식,손미영,이영철,박청,김태동,김영래,박종일,윤완희,박승길,황병두 한국노화학회 2001 한국노화학회지 Vol.11 No.1

Feasibility Study of CNN-based Super-Resolution Algorithm Applied to Low-Resolution CT Images

Doo Bin KIM(Doo Bin KIM),Mi Jo LEE(Mi Jo LEE),Joo Wan HONG(Joo Wan HONG) 한국인공지능학회 2024 인공지능연구 (KJAI) Vol.12 No.1

Recently, various techniques are being applied through the development of medical AI, and research has been conducted on the application of super-resolution AI models. In this study, evaluate the results of the application of the super-resolution AI model to brain CT as the basic data for future research. Acquiring CT images of the brain, algorithm for brain and bone windowing setting, and the resolution was downscaled to 5 types resolution image based on the original resolution image, and then upscaled to resolution to create an LR image and used for network input with the original imaging. The SRCNN model was applied to each of these images and analyzed using PSNR, SSIM, Loss. As a result of quantitative index analysis, the results were the best at 256×256, the brain and bone window setting PSNR were the same at 33.72, 35.2, and SSIM at 0.98 respectively, and the loss was 0.0004 and 0.0003, respectively, showing relatively excellent performance in the bone window setting CT image. The possibility of future studies aimed image quality and exposure dose is confirmed, and additional studies that need to be verified are also presented, which can be used as basic data for the above studies.

Triangular resonator with surface plasmon resonance around the critical angle

Kim, Doo Gun,Oh, Geum-Yoon,Kim, Seon Hoon,Ki, Hyun Chul,Kim, Hyo Jin,Kim, Hwe Jong,Kim, Jae Hun,Chung, Tae Kyung,Choi, Young-Wan American Institute of Physics 2011 JOURNAL OF APPLIED PHYSICS - Vol.110 No.7