담배가격인상 효과분석

김도훈,한광환,Kim Do-Hoon,Han Kwang-Hwan 한국연초학회 2005 한국연초학회지 Vol.27 No.2

The government continuously increases cigarette price to reduce the smoking rates. Opinions of cigarette makers and Ministry of Health and Welfare on the effect of cigarette price hike are sharply opposed. This dispute is important because there is possibility of additional increase of cigarette price by 500 won. Therefore, as an inquiry into existing studies for the effect of cigarette price hike on tobacco product, namely analysis of the effect of cigarette price hike consumption, we empirically analyzed the effect of cigarette excise tax hike through establishing improved analytic models considering time trend. As a result, it is substantiated that time trend in the effect of cigarette excise tax hike is certainly exist and early impact is heavy. However, the amount of cigarette consumption is recovered to the level of the average in 5 months. Since it is proved that the long term effect of cigarette price hike is immaterial, health authority should reconsider the plan of additional raising cigarette price by 500 won.

Effects of fluoride on osteoclastic bone resolution during experimentally moved rat molars

김도훈,문윤식,고재승,김현만,Kim, Do-Hoon,Moon, Yoon-Shik,Ko, Jea-Seung,Kim, Hyun-Man The Korean Association Of Orthodontists 2000 대한치과교정학회지 Vol.30 No.6

교정적인 치아이동은 치주조직, 특히 치조골의 개조를 필요로 한다. 불소는 파골세포에 의한 골흡수를 방해하는 물질로 알려져 있다. 이 연구의 목적은 불소의 섭취가 교정적인 치아이동시 압박측 치주조직에서 파골세포의 출현에 어떠한 영향을 끼치는 지를 조사하는 것이다. 40마리의 백서에게 60일동안 불화나트륨(NaF)가 각각 0, 10, 25 mg/kg/일 함유된 물을 음수시킨 후, 약 50-70g의 교정력을 가하여 상악 제 1 대구치를 근심쪽으로 경사이동시켰다. 교정력을 가한 24, 48, 그리고 96 시간 후에 대조군과 실험군을 희생시킨 후 조직편을 제작하여 상악 제 1 대구치의 압박측 치주조직 $450\times700\;{\mu}m^2$을 관찰하여 출현한 파골세포의 수와 흡수량을 조사하여 다음과 같은 결론을 내렸다. 1. 모든 측정시간에서 25 mg/kg/일 군에서 대조군보다 파골세포의 수가 유의성 있게 적었다. (p<0.05) 2. 24, 48시간 측정에서 25 mg/kg/일 군에서 대조군보다 흡수되는 면적이 유의성 있게 적었다. (p<0.05) 3. 대조군에서는 48시간에서 96시간 사이에 흡수되는 면적이 약간 감소하였으나, 10 mg/kg/일 군과 25 mg/kg/일 군 모두에서는 약간 증가하였다. Orthodontic tooth movement requires remodelling of periodontal tissues, especially alveolar bone. Fluoride is known to be a potent inhibitor of osteoclastic bone resorption. The purpose of this study was to examine the effects of a consumption of fluoride on osteoclast numbers appearing on the pressure side of alveolar bones at experimental tooth movement. 40 male rats were exposed to 0, 10, 25 mg/kg/day of sodium fluoride(NaF) in their drinking water for up to 60 days. Orthodontic appliance were activated to mesially tip maxillary first molar with 50-70g. The rats were sacrificed at 1, 2, 4 days after initial activation. The number of osteoclast was counted in a $450\times700\;{\mu}m^2$ area interradicular septum on the pressure side of the maxillary first molar. The results were as fellows, 1. There was significantly different osteoclast number between control group and 25 mg/kg/day group at all measured time. (p<0.05) 2. There was significantly different active bone-resorption area between control group and 25 mg/kg/day group except at 96 hours post activation. (p<0.05) 3. There was slight reduction of active bone- resorption area in control group from 48 hours to 96 hours but in both 10 mg/kg/day group and 25 mg/kg/day group a slight increase was observed from 48 hours to 96 hours.

급속 열처리가 a-IGZO 박막의 전도에 미치는 영향

김도훈,조원주,Kim, Do-Hoon,Cho, Won-Ju 한국전기전자재료학회 2016 전기전자재료학회논문지 Vol.29 No.1

The conduction behavior and electron concentration change in a-IGZO thin-films according to the RTA (rapid thermal annealing) were studied. The electrical characteristics of TFTs (thin-film-transistors) annealed by different temperatures were measured. The sheet resistance, electron concentration, and oxygen vacancy of a-IGZO film were measured by the four-point-probe-measurement, hall-effect-measurement, and XPS analysis. The RTA process increased the driving current of IGZO TFTs but the VTH shifted to the negative direction at the same time. When the RTA temperature is higher than $250^{\circ}C$, the leakage current at off-state increased significantly. This is attributed to the increase of oxygen vacancy resulting in the increase of electron concentration. We demonstrate that the RTA is a promising process to adjust the VTH of TFT because the RTA process can easily modify the electron concentration and control the conductivity of IGZO film with short process time.

모델예측제어 기법을 이용한 제지공정에서의 지종교체 제어

김도훈,여영구,박시한,강홍,Kim, Do-Hoon,Yeo, Young-Gu,Park, Si-Han,Kang, Hong 한국펄프종이공학회 2003 펄프.종이기술 Vol.35 No.4

In this work an integrated model for paper plants combining wet-end and dry section is developed and a model predictive control scheme based on the plant model is proposed. Closed-loop process identification method is employed to produce a state-space model. Thick stock, filler flow, machine speed and steam pressure are selected as input variables and basis weight, ash content and moisture content are considered as output variables. The desired output trajectory is constructed in the form of 1st-order dynamics. Results of simulations for control of grade change operations are compared with plant operation data collected during the grade change operations under the same conditions as in simulations. From the comparison, we can see that the proposed model predictive control scheme reduces the grade change time and achieves stable steady-state.

변화점을 고려한 소프트웨어 신뢰도 성장모형의 모수추정

김도훈,박천건,남경현,Kim, Do-Hoon,Park, Chun-Gun,Nam, Kyung-H. 한국통계학회 2008 응용통계연구 Vol.21 No.5

비동질적 포아송과정(NHPP) 모형은 신뢰성 공학에서 소프트웨어 내에 남아있는 결함발견현상을 설명하는데 자주 사용된다. 이때 결함발견율은 연속적이며 단조함수를 가정하였으나 현실적으로 소프트웨어 시험환경, 전략 및 자원할당 등으로 인해 결함발견율이 변하는 경우가 있다. 본 논문은 결함발견율이 변화하는 변화점 문제를 고려한 소프트웨어 신뢰도 성장모형(SRGM)을 고려하여 모수를 추정하는데 목적이 있다. 이를 위해 자료를 모의 생성한 후 평균값 함수의 각 모수를 최우추정법과 최소제곱법을 이용하여 추정하며, 결함발견구간이 일정하게 증가하는 경우와 일정하게 증가하지 않는 경우를 각각 고려한다. 이때 각 모수의 적합도 비교 평가를 통하여 변화점을 고려한 SRGM에서의 최적 추정법을 수치적 방법으로 판단한다. The non-homogeneous Poisson process(NHPP) based software reliability growth models are proved quite successful in practical software reliability engineering. The fault detection rate is usually assumed to be the continuous and monotonic function. However, the fault detection rate can be affected by many factors such as the testing strategy, running environment and resource allocation. This paper describes a parameter estimation of software reliability growth model with change-point problem. We obtain the maximum likelihood estimate(MLE) and least square estimate(LSE), and compare goodness-of-fit.

유통 한약재 중 내분비계 장애물질로서의 잔류농약에 관한 연구(I)

김도훈,김혜수,오미현,강인호,심영훈,황완균,명승운,최병기,조정희,Kim, Do-Hoon,Kim, Hye-Soo,Oh, Mi-Hyune,Kang, In-Ho,Shim, Young-Hun,Hwang, Wan-Kyun,Myung, Seong-Wun,Choe, Byung-Ki,Cho, Jung-Hee 한국생약학회 2000 생약학회지 Vol.31 No.4

Research on pesticide residues as endocrine disruptors in natural medicines was initiated by Korea Food & Drug Administration this year. We determined the presence and levels of certain pesticides in selected natural medicines. The natural medicines collected this year are Glycyrrhiza Root, Cinnamon Bark, Pueraria Root, Polygonatum Rhizome, Jujube, Schizandra Fruit, Lycium Fruit, Liriope Tuber, Eucommia Bark, Peony Root, Korean Angelica, Dioscorea Rhizome, Cnidium Rhizome, Cassia Seed, Platycodon Root, Comus Fruit, Mentha Herb, Epimedium Herb, Bupleurum Root, and Ginger, which have no data for pesticide residues and 192 samples of them were circulated in Korea, 28 samples were circulated in China. In order to analyze many pesticides in large number of samples we used simultaneous multi-residue analysis of pesticides by GC-ECD, which was followed by GC-MSD analysis to confirm the identity of the detected pesticide in each sample.

임플란트 CT에서 방향 표시자의 방향과 잔존골을 고려한 임플란트 식립 방향의 관계에 관한 연구

김도훈,허민석,이삼선,오성욱,최항문,전인성,최순철,Kim Do-Hoon,Heo Min-Suk,Lee Sam-Sun,Oh Sung-Ook,Choi Hang-Moon,Jeon In-Seong,Choi Soon-Chul 대한영상치의학회 2003 Imaging Science in Dentistry Vol.33 No.2

Purpose : To assess the relationship between the direction of the indicating rod of the radiographic stent for ideal prosthetic design and the actual possible path of implant fixture placement when residual ridge resorption is considered. Materials and Methods: The study materials consisted of 326 implant sites (male 214 cases and female 112 cases) from a total of 106 patients (male 65 patients and female 41 patients) who desired implant prostheses. Computed tomography of patients were taken and reformatted using ToothPix/sup (R)/ software. Bony defects, bony sclerosis, the change of the direction of indicating rod, and root proximity of the adjacent teeth were examined on the CT-derived images. Results: The rate of the irregular crestal cortex was relatively high on premolar and molar area of maxilla. Mandibular molar area showed relatively high rate of focal sclerosis on the area of implant fixture insertion. The position of the indicating rods were relatively acceptable on the molar areas of both jaws. However, the position of the indicating rods should be shifted to buccal side with lingual rotation of the apical end on maxillary anterior teeth and premolar area. Conclusion: Clinically determined rod direction and position of the indicating rod for implant placement was not always acceptable for insertion according to the reformatted CT images. The pre-operative treatment plan for implant should be determined carefully, considering the state of the alveolar bone using the reformatted CT images.

전도성 고분자/CdTe 나노입자/탄소 나노튜브 복합박막의 특성 연구

김도훈,심성은,김정수,남대근,오원태,Kim, Do-Hoon,Shim, Seong Eun,Kim, Jungsoo,Nam, Dae-Geun,Oh, Weontea 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.4

The composites composed of conducting polymer (MEH-PPV), CdTe nanoparticles, and multiwalled carbon nanotubes (MWNTs) were spectroscopically and electrically characterized in their thin films. The composite films were prepared by spray coating. These composites were prepared from the mixture solution of MEH-PPV and CdTe-embedded MWNTs, in which CdTe nanoparticles were electrostatically bound to MWNTs. UV/vis and PL spectra were analyzed to investigate the optical absorbance and emission of the composite films. In addition, their structural, electrochemical, and electrical properties were studied by transmission electron microscopy, cyclic voltammetry, and I-V measurement.

안면부 모세혈관기형에 따른 광범위 안면부 결손의 유리피판술을 이용한 치험례

김도훈,변재경,문구현,방사익,오갑성,임소영,Kim, Do-Hoon,Pyon, Jai-Kyong,Mun, Goo-Hyun,Bang, Sa-Ik,Oh, Kap-Sung,Lim, So-Young 대한미세수술학회 2011 Archives of reconstructive microsurgery Vol.20 No.1

Capillary malformation is common vascular malformation. In case of facial capillary malformation, patients' cosmetic and functional deficits are quite significant. The standard treatment which has been applied so far for capillary malformation is pulsed dye laser with 585nm. But in case of advanced capillary malformation, surgical interventions are inevitable. The problem of large size facial capillary malformation is how to cover the remnant defect, which occurs after resection. In this case, authors have experienced surgical treatment of large size facial capillary malformation and covered the large facial defect with free thoracodorsal artery perforator flap. The flap was thick, so facial asymmetry remained after the first surgery. But with the secondary procedure, authors have made more symmetric figures. The patient was satisfied with the result. Using free flap to replace the defect after resection due to capillary malformation is useful for these kinds of cases.

디지털 컨버전스 인프라로서의 NgN 환경에서 인터넷 산업구조 : ISP, CP, CDN 사업자간 경쟁을 중심으로

김도훈,Kim, Do-Hoon 한국경영과학회 2006 經營 科學 Vol.23 No.3

ITU-T's NgN(Next generation Network) architecture is expected to offer a new Internet platforms such as QoS(Quality of Service) guaranteed services as it overcame the limitations of the existing best-effort Internet architecture. However, policy development crucial for the NgN framework(e.g., interconnections and billing) is lagging far behind technology development. For example, arguments over network neutrality clearly indicate little understanding of the Internet industry structure where diverse providers including ISP and CP coexist. This study employs a network economics approach to predict how the competitive landscape involving various providers will evolve under the traffic-based billing system under the NgN environment. Applied is the non-cooperative game theory, in particular, Stackelberg's repeated game in order to build and analyze model for competition among those providers. We also studied possible impacts that CPs would have on the competitive landscape if they have an option to replace ISP: i.e., CDN(Content Delivery Network) provider. Lastly, based on the model analysis and experiments, presented are their implications to policy development and tile future prospect.