모바일 E-Book Store System의 설계 및 구현

민기홍,전승민,김송래,박동원,Min, Gi-Hong,Jeon, Seung-Min,Kim, Song-Rae,Park, Dong-Won 배재대학교 공학연구소 2004 공학논문집 Vol.6 No.1

최근의 IT분야에 있어서, 그 최대의 관심사는 모바일 환경일 것이다. 이는 우리생활의 일부분이 되어 간다고 볼 수 있는데, 교육, 학습, 상거래 , 엔터테이먼트 등의 부분에 있어서 그 응용 정도는 실로 높다고 할 수 있다. 본 논문에서는 이러한 필요에 의하여 WEB과 DB연동 그리고 모바일 기술을 이용한 모바일 E-BOOK 서점을 구현하였다. 많은 양의 자료들을 DBMS에서 관리하고 필요한때 언제 어디서나 모바일을 이용한 WEB검색을 통해 사용자에게 서비스를 제공할 수 있게 된다면, 관리면에서나 능률면에서 큰 장점이 있을 것이다. 본 시스템은 데스크탑 환경의 WEB상에서 사용할수 있는 실제 WEB사이트와 PDA를 이용하여 사용가능한 모바일 WEB 환경으로 이중 구성되어 있으며 게시판, 도서검색, 장바구니, 결제확인 시스템, 베스트셀러, 신작도서 등의 기능을 다양하게 사용할 수 있다. 관련된 모든 정보는 데이터베이스로 구축되어 있다. 최신기술인 ASP 및 VS, NET 등의 기술을 사용하였으며 웹서버로는 IIS 5.0을 DB서버로는 같은 MicroSoft 사의 MS-SQL을 사용하였다. 하나의 운영체제 상에서 실시되는 팩키지 시스템인 만큼, 그 안정성과 특이성을 인정할 만 하다 하겠다. 본 논문는 아직까지 상업적으로까지 성공적으로 시도 되지 않았던 모바일 상에서의 전자 상거래를 구현하였다는 점에서 큰 가능성을 제시하였다고 본다. In the recent IT field, the biggest concerns may be Mobile environment. This means that it becomes part of our life: the Mobile is applied to the areas of teaching, studying, commercial transaction, entertainment etc. In this paper, we implemented Mobile E-BOOK bookstore using WEB, DB, and a Mobile technology. This system takes duplex from to be available in Mobile WEB environment by PDA and actuality WEB site under desk top environment. This paper have presented big possibility in terms of embodied electronic commerce based on the Mobile-based E-BOOKstore system that has not attempted yet commercially.

임신중 제대길이와 만기임신시 제대합병증

민기홍(KH Min),김영탁(YT Kim),이국(K Lee),조동제(DJ Cho),송찬호(CH Song) 대한산부인과학회 1989 Obstetrics & Gynecology Science Vol.32 No.3

1. 12예의 임신 22-32주와 462예의 임신 33-44주의 제대길이는 각각 36.6+-7.1cm 53.6+-11.1cm로 두군간에 의미있는 차이가 잇었고 (p<0.05), 임신 33주후에는 임신주수에 따 른 제대길이간의 의미있는 차이는 없었다. 2. 만기임신시 평균제대길이는 52.1+-10.0cm이었고 정상범위는 39-74cm이었다. 3. 만기임신시 제대길이는 태반이 무거울수록 의미잇게 길었고 임신중독증시 합병증이 ㅇ벗 는 경우 보다 의미잇게 짧았고 산모의 ABO혈액형, 태아의 성별 및 체중, 태위는 제대길이와 유의한 상관관계가 없었다. 4. 만기임신시 경부제대의 빈도는 짧은 제대군, 정상군, 긴제대군에서 각각 5.4%, 23.4%, 54.3%로 제대길이가 길면 길수록 경부제대의 빈도는 의미있게 높앗고 총 발생빈도는 23.2% 로 1회시 20.2%, 2회시 2.6%, 3회시 0.4%였다. 5. 만기임신시 경부제대가 잇는 군이 없는 군에 비해 의미있게 태변의 빈도가 높았다. 6. 만기임신시 태변, 태아곤란, 5이하의 Apgar 점수는 제대길이군 간에 관련이 없었다. 7. 만기임신중 사산1예, 신생아사망 3예가 있었는데 제대합병증과는 관계가 없었다. 1. There was significantly difference in cord lengths between 22-32nd week of gestation and 33-44th week of gestation but was no difference in cord lengths according the gestational weeks after 33weeks of gestation 2. The mean cord length was 52.1+-10.0cm with the range between 30 and 95 cm at term 3. None of the following factore (maternal ABO blood group , fetal sex and weight presentation) seemed to affect the lengths of the cord except for the placental weight and preeclampsia at term 4. A long umbilical cord was more frequency associated with nuchal cord than a normal and short cord at term (p<0.001) the overall incindence of nuchal cord was 23.2%, one nuchal cord to be 20.2% two nuchal cords to be 2.6% and three nuchal cords to be 0.4%. 5. There was correlation between nuchal cords and meconium (p<0.01). 6. There was no correlation between meconium, fetal distress and low Apgar score and umbilical cord lengths. 7. There were one case of stillbirth and three cases of neonatal deaths but no correlation between perinatal death and umbilical cord lengths was found.

CMIT/MIT 가습기살균제 사용에 따른 피해구제 신청자의 노출등급 및 노출특성 분석

민기홍(Gihong Min),신정현(Junghyun Shin),조은경(Eun-Kyung Jo),이슬아(Seula Lee),신지훈(Jihun Shin),김동준(Dongjun Kim),우재민(Jaemin Woo),최윤형(Yoon-Hyeong Choi),양원호(Wonho Yang) 한국환경보건학회 2023 한국환경보건학회지 Vol.49 No.3

Background: The Korea Centers for Disease Control and Prevention (KCDC) has identified cases of people suspected of suffering lung disease potentially caused by chloromethylisothiazolinone/methylisothiazolinone (CMIT/MIT) used in humidifier disinfectants (HDs). The Korean Ministry of Environment (MoE) epidemiological investigation and toxicity test study found that HDs caused health damage such as asthma and lung disease. Objectives: The main purposes of this study were to classify the HD exposure rating and to analyze the exposure characteristics that affect exposure to CMIT/MIT HDs. Methods: The exposure characteristics and socio-demographic characteristics of victim participants using CMIT/MIT HDs were investigated through questionnaires. An inhalation no observed adverse effect level (NOAEL) for CMIT/MIT was produced based on inhalation toxicity values. Exposure ratings (class 1~class 2) were cross-tabulated with clinical ratings (acceptable~unacceptable). A correlation analysis was conducted with the main exposure characteristics that affect the exposure concentration of CMIT/MIT HDs. Results: The concentration in indoor air of CMIT/MIT was 8.75±25.40 μg/m3, and the exposure concentration was 2.30±6.29 μg/m3. The CMIT/MIT exposure rating of 67 participants with high exposures of not more than MOE 100 were evaluated as 14.5%, while the damage participants who matched the clinical rating made up 4.5%. The exposure concentration of CMIT/MIT showed a positive correlation with the daily usage amount and usage frequency, and a negative correlation with volume of the indoor environment. Conclusions: A new exposure rating could be suggested and calculated based on the MOE, and the factors affecting the exposure concentration could be identified.

Study on Optical Measurement of the Particulate Matter Concentration to Minimize Particulate Matter Sensor Size

Kihong Min(민기홍),Yong-Kweon Kim(김용권) 대한전기학회 2018 대한전기학회 학술대회 논문집 Vol.2018 No.10

2016년 1월 23일~25일에 발생한 서해안 대설 발달 메커니즘 분석

이재근(Jae-Geun Lee),민기홍(Ki-Hong Min) 한국기상학회 2018 대기 Vol.28 No.1

This study examined the lake effect of the Yellow Sea which was induced by the Siberian High pressure system moving over the open waters. The development mechanism of the convective cells over the ocean was studied in detail using the Weather Research and Forecasting model. Numerical experiments consist of the control experiment (CTL) and an experiment changing the yellow sea to dry land (EXP). The CTL simulation result showed distinct high area of relative vorticity, convergence and low-level atmospheric instability than that of the EXP. The result indicates that large surface vorticity and convergence induced vertical motion and low level instability over the ocean when the arctic Siberian air mass moved south over the Yellow Sea. The sensible heat flux at the sea surface gradually decreased while latent heat flux gradually increased. At the beginning stage of air mass modification, sensible heat was the main energy source for convective cell generation. However, in the later stage, latent heat became the main energy source for the development of convective cells. In conclusion, the mechanism of the west coast heavy snowfall caused by modification of the Siberian air mass over the Yellow Sea can be explained by air-sea interaction instability in the following order: (a) cyclonic vorticity caused by diabatic heating induce Ekman pumping and convergence at the surface, (b) sensible heat at the sea surface produce convection, and (c) this leads to latent heat release, and the development of convective cells. The overall process is a manifestation of air-sea interaction and enhancement of convection from positive feedback mechanism.

도시 캐노피와 수평 고해상도가 여름철 대류성 도시 강수에 미치는 영향

이영희(Young-Hee Lee),민기홍(Ki-Hong Min) 한국기상학회 2016 대기 Vol.26 No.1

The objective of this study is to examine the impact of urban canopy and the horizontal resolution on simulated meteorological variables such as 10-m wind speed, 2-m temperature and precipitation using WRF model for a local, convective rainfall case. We performed four sensitivity tests by varying the use of urban canopy model (UCM) and the horizontal resolution, then compared the model results with observations of AWS network. The focus of our study is over the Seoul metropolitan area for a convective rainfall that occurred on 16 August 16 2015. The analysis shows that mean diurnal variation of temperature is better simulated by the model runs with UCM before the convective rainfall. However, after rainfall, model shows significant difference in air temperature among sensitivity tests depending on the simulated rainfall amount. The rainfall amount is significantly underestimated in 0.5 km resolution model run compared to 1.5 km resolution, particularly over the urban areas. This is due to earlier occurrence of light rainfall in 0.5 km resolution model. Earlier light rainfall in the afternoon eliminates convective instability significantly, which prevents occurrence of rainfall later in the evening. The use of UCM results in a higher maximum rainfall in the domain, which is due to higher temperature in model runs with urban canopy. Earlier occurrence of rainfall in 0.5 km resolution model is related to rapid growth of PBL. Enhanced mixing and higher temperature result in rapid growth of PBL, which provides more favorable conditions for convection in the 0.5 km resolution run with urban canopy. All sensitivity tests show dry bias, which also contributes to the occurrence of light precipitation throughout the simulation period.

불임환자에 있어서 chlamydia trachomatis 감염의 의의

유명숙(MS Yoo),민기홍(KH Min),조동제(DJ Cho),송찬호(CH Song) 대한산부인과학회 1988 Obstetrics & Gynecology Science Vol.31 No.9

1985년 12월1일부터 1987년 6월30일까지 연세대학교 의과대학부속 영동 세브란스병원에 내 원한 불임환자 133명을 대상으로 ELISA법을 이용한 chlamydia 검사를 시행하여 다음과 같은 결론은 얻었다. 1. 133예의 불임환자중 chlamydia trachomatis 양성인 경우는 14예로 이환율은 10.5%(14/133) 였다. 2. chlamydia trachomatis 감염군의 평균연령은 28.6세 비감염군은 29.6세엿다. 3. 결혼 및 불임기간은 감염군은 결혼기간 34개월, 불임기간 32개월이엇고, 비감염군은 결혼 기간 69.4개월, 불임기간 60.8개월로 감염군에서 그 기간이 의의잇게 짧앗다. 4. 기왕임신력은 감염과 관계가 없었다. 5. 과거 피임방법사용력은 감염에 영향을 미치지 않앗다. 6. 난관조영술 및 복강경 소견상 난관병태는 감염군에서 92.7% 비감염군에서 51.1%로 양군 가에 통계학적으로 유의한 차이를 보엿다. 7. 감염군의 난관병태중 난관수종이 42.8%로 가장많앗다. chlamydia trachomatis was known as one of the important etiologic organisms of pelvic inflammatory disease in women resulting pelvic peritioneal and tubal pathology or female infertility. This study was conducted to assess the incindence of chlamydia trachomatis in infertile women and clinical characteristics of chlamydia infected infertile patients . 1. The incindence of chlamydial infection in infertile women, tested by ELISA method, was 10.52%(14/133) 2. The duration of marital life and infertility in positive chlamydid test group were significantly shorter than that of negateive test group (P<0.005) 3. no significant difference in age, obstetric history and previous contraceptive method were noted between two group . 4. Pathologic findings were more frequency seen in positive chlamydia test group (P<0.01), and the most frequent tubal pathologic finding was hydrosal-inx(42.8%)

블로킹에 의한 2014년 2월 동해안 지방 폭설 분석

배정호(Jeong-Ho Bae),민기홍(Ki-Hong Min) 한국기상학회 2016 대기 Vol.26 No.2

This study investigated the cause of the heavy snowfall that occurred in the East Coast of Korea from 6 February to 14 February 2014. The synoptic conditions were analyzed using blocking index, equivalent potential temperature, potential vorticity, maritime temperature difference, temperature advection, and ground convergence. During the case period, a large blocking pattern developed over the Western Pacific causing the flow to be stagnant, and there was a North-South oriented High-to-Low pressure system over the Korean Peninsula because of this arrangement. The case period was divided into three parts based on the synoptic forcing that was responsible for the heavy snowfall; detailed analyses were conducted for the first and last period. In the first period, a heavy snowfall occurred over the entire Korean Peninsula due to strong updrafts from baroclinic instability and a low pressure caused by potential vorticity located at the mid-troposphere. In the lower atmosphere, a North-South oriented High-to-Low pressure system over the Eastern Korea intensified the easterly airflow and created a convergence zone near the ground which strengthened the upslope effect of the Taebaek Mountain range with a cumulative fresh snowfall amount of 41 cm in the East Coast region. In the last period, the cold air nestled in the Maritime Province of Siberia and Manchuria strengthened much more than that in the first half and extended to the East Sea. The temperature difference between the 850 hPa air and the SST was large and convective clouds developed over the sea. The highest cumulative fresh snow amount of 39.7 cm was recorded in the coastal area during this period. During the entire period, vertically oriented equivalent potential temperature showed neutral stability layer that helped the cloud formation and development in the East Coast. The 2014 heavy snowfall case over the East Coast provinces of Korea were due to: 1) stagnation of the system by blocking pattern, 2) the dynamic effect of mid-level potential vorticity of 1.6 PVU, 3) the easterly air flow from North-South oriented High-to-Low pressure system, 4) the existence of vertically oriented neutral stable layer, and 5) the expansion of strong cold air into the East Sea which created a large temperature difference between the air and the ocean.

서울시 구로구에서 COVID-19 발생 전ㆍ후 초미세먼지(PM2.5) 농도 변화에 따른 인구집단 노출평가

김동준(Dongjun Kim),민기홍(Gihong Min),최영태(Yongtae Choe),신준섭(Junshup Shin),우재민(Jaemin Woo),김동준(Dongjun Kim),신정현(Junghyun Shin),조만수(Mansu Jo),성경화(Kyeonghwa Sung),최윤형(Yoon-hyeong Choi),이채관(Chaekwan Lee),최길용(K 한국환경보건학회 2021 한국환경보건학회지 Vol.47 No.6

Background: The coronavirus disease (COVID-19) has caused changes in human activity, and these changes may possibly increase or decrease exposure to fine dust (PM2.5). Therefore, it is necessary to evaluate the exposure to PM2.5 in relation to the outbreak of COVID-19. Objectives: The purpose of this study was to compare and evaluate the exposure to PM2.5 concentrations by the variation of dynamic populations before and after the outbreak of COVID-19. Methods: This study evaluated exposure to PM2.5 concentrations by changes in the dynamic population distribution in Guro-gu, Seoul, before and after the outbreak of COVID-19 between Jan and Feb, 2020. Gurogu was divided into 2,204 scale standard grids of 100 m×100 m. Hourly PM2.5 concentrations were modeled by the inverse distance weight method using 24 sensor-based air monitoring instruments. Hourly dynamic population distribution was evaluated according to gender and age using mobile phone network data and time-activity patterns. Results: Compared to before, the population exposure to PM2.5 decreased after the outbreak of COVID-19. The concentration of PM2.5 after the outbreak of COVID-19 decreased by about 41% on average. The variation of dynamic population before and after the outbreak of COVID-19 decreased by about 18% on average. Conclusions: Comparing before and after the outbreak of COVID-19, the population exposures to PM2.5 decreased by about 40%. This can be explained to suggest that changes in people’s activity patterns due to the outbreak of COVID-19 resulted in a decrease in exposure to PM2.5.

2013년 8월 6일 한반도에서 발달한 다세포(Multicell) 대류계의 특성 분석

윤지현(Ji-Hyun Yoon),민기홍(Ki-Hong Min) 한국기상학회 2016 대기 Vol.26 No.2

Damages caused by torrential rain occur every year in Korea and summer time convection can cause strong thunderstorms to develop which bring dangerous weather such as torrential rain, gusts, and flash flooding. On 6 August 2013 a sudden torrential rain concentrated over the inland of Southern Korean Peninsula occurred. This was an event characterized as a mesoscale multicellular convection. The purpose of this study is to analyze the conditions of the multicellular convection and the synoptic and mesoscale nature of the system development. To this end, dynamical and thermodynamic analyses of surface and upper-level weather charts, satellite images, soundings, reanalysis data and WRF model simulations are performed. At the beginning stage there was a cool, dry air intrusion in the upper-level of the Korean Peninsula, and a warm humid air flow from the southwest in the lower-level creating atmospheric instability. This produced a single cell cumulonimbus cloud in the vicinity of Baengnyeongdo, and due to baroclinic instability, shear and cyclonic vorticity the cloud further developed into a multicellular convection. The cloud system moved southeast towards Seoul metropolitan area accompanied by lightning, heavy precipitation and strong wind gusts. In addition, atmospheric instability due to daytime insolation caused new convective cells to develop in the upstream part of the Sobaek Mountain which merged with existing multicellular convection creating a larger system. This case was unusual because the system was affected little by the upper-level jet stream which is typical in Korea. The development and propagation of the multicellular convection showed strong mesoscale characteristics and was not governed by large synopticscale dynamics. In particular, the system moved southeast crossing the Peninsula diagonally from northwest to southeast and did not follow the upper-level westerly pattern. The analysis result shows that the movement of the system can be determined by the vertical wind shear.