돼지발정유도제가 후보돈의 생산성적에 미치는 영향

송훈 ( Hoon Song ),조현웅 ( Hyunwoong Jo ),손정현 ( Jeonghyeon Son ),김법균 ( Beob Gyun Kim ) 한국축산학회 2023 축산기술과 산업 Vol.10 No.1

Gonadotropin products are available for inducing estrus of gilts. A concern is a potential negative effect of the estrus inducer on the farrowing performance. This study aimed to evaluate the effects of an estrus-inducing agent on gilt productivity at a commercial farm. A total of 60 gilts that had not shown estrus for more than 14 days were treated with an estrus inducer. Among these gilts, 51 exhibited estrus and underwent artificial insemination. Additionally, 64 gilts naturally went into estrus and were also artificially inseminated during the same period. The pregnancy rates for the natural estrus group and the estrus inducer treatment group were 93.7% and 92.2%, respectively, showing no difference. Furthermore, there were no significant differences observed in farrowing performance between the two groups, including total litter size (11.5 vs. 11.4), stillbirths (0.38 vs. 0.42), fostering piglets (11.1 vs. 11.1), and the number of weaned piglets (10.9 vs. 10.7). Wean-to-estrus interval also did not differ between the two groups. Taken together, we failed to find any detrimental effects of estrus inducers on the reproductive performance of gilts.

KOSDIC과 GIS 데이터 연계를 위한 기초 연구

송훈(Song Hoon),윤기병(Yoon Ki-Byung),이명식(Lee Myung-Sik),김성아(Kim Sung-Ah),김성식(Kim Sung-Sik),임경일(Lim Kyung-Il) 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

This paper intends to examine technical possibility to use KOSDIC drawing exchange format in the domain of GIS application. SDTS is defined as a international standard format for GIS data exchange. For the data exchange with SDTS data model, CADD profile is already defined so that many different CAD format such as DXF can be integrated. Based on the profile, KOSDIC format is examined to exchange data as a national standard. It also proposes policies to be use KOSDIC as a national standard for drawing data exchange in the domain of GIS.

CT Mammography검사 시 자세변화에 따른 영상평가 및 적정선량에 관한 연구

송훈(Hoon Song),김현주(Hyeon Ju Kim),신훈(Hoon Shin),조인완(In Wan Cho),오용운(Yong Woon OH),유병헌(Byeong Heon Yoo),김승식(Seung Sik Kim) 대한CT영상기술학회 2008 대한CT영상기술학회지 Vol.10 No.1

Purpose The subject of this study is female breast cancer patient who had. CT mammography before and after surgery. The study covers effects on exposure dose and image quality by change of exposure condition are observed, and makes comparative, analytic study of difference between a breast image taken with supine position and the other one with prone position. Materials & Methods Qualities of supine position image were compared with those of prone position image and difference between two of the images were analyzed with change of kVp and mAs by 3grades(Equivalent, Acceptable, Unacceptable). A special equipment was used for prone position image so as to breast of the subjects don’t be squeezed. CTDIvol was recorded scanning by 120kVp/100mAs during usual scanning and 100kVp/70mAs for this study. 20 female breast cancer patients were subjects, and Somatom Sensation16(Siemens, Erlagen, Germany) was used by 2 observers in this study. Two studies were conducted on phantom. First, ion chambers were put into holes around and center of a phantom, and exposure dose on reader was recorded after scanning the phantom with change of kVp and mAs. Second, CTDIvol that was changing by exposed area differ by position of the breast phantom was measured with change of kVp and mAs, Results According to the 20 scanned images based on change of position and image quality, It gives 1 case on Equivalent, 19 cases on Acceptable and 0 case on Unacceptable. CTDIvol is measured as 7.8mGy at 120kVp/100mAs and 3.5mGy at 100kVp/70mAs. but there was no relation with position. Surface dose decreased by mean 59% and deep dose decreased by 63% at 100kVp/70mAs compared at 120kVp/100mAs in phantom study while dose is measured as 1.11mGy at 100kVp/70mAs with straighten up position for maximum exposed area which is reduced by 10% compared with a lateral position in the same condition. Conclusion It’s impossible for exposure dose to be less than a certain value in order to satisfy a proper condition, 100kVpn/70mAs, at which the image quality is not effected. In this study, it results that prone position makes fine image especially for diagnosing patients before surgery rather than supine position does. consequently, this study shows that prone position have decisive role for the accurate examination of breast cancer

다공성 원료를 사용한 수열합성 패널의 물성과 포름알데히드 흡착 특성

임두혁,추용식,송훈,이종규,Im, Du-Hyuk,Chu, Yong-Sik,Song, Hoon,Lee, Jong-Kyu 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6

Formaldehyde emissions from the construct was harmful to human. Diatomite, bentonite and zeolite were used as porous materials for fabricating panels. Formaldehyde adsorption and physical characteristics of porous materials were investigated and hydrothermal method was applied to fabricate panels. Formaldehyde adsorption contents of panels with porous materials were higher than that of panel without porous materials. The panels with Cheolwon diatomite and Pohang zeolite showed excellent characteristics of Formaldehyde adsorption. These characteristics were caused by higher surface area and pore volume of porous materials. Formaldehyde adsorption contents were influenced by surface area and pore volume of panels. Correlation coefficient between surface area and Formaldehyde adsorption content of panels was 0.87. The panels with porous materials had higher strength than that without porous materials because of bridging role particles.

무기계 건설폐기물을 이용한 재생시멘트 배합설계에 관한 이론적 제안

김지훈(Ji-Hoon Kim),태성호(Sung-Ho Tae),송훈(Hun Song),신현욱(Hyeon-Uk Shin) 한국건설순환자원학회 2016 한국건설순환자원학회 논문집 Vol.4 No.3

오늘날 시멘트 산업은 시멘트 제조시 발생되는 이산화탄소(CO2)의 배출량을 줄이기 위해 각종 산업부산물을 연료의 대체재로 사용하거나 건설폐기물을 재활용한 콘크리트 제 2차 제품을 개발하는 등 환경부하 저감 산업으로 변모하기 위해 노력하고 있다. 이에 본 연구에서는 국내 발생되는 건설폐기물의 종류와 발생추이를 고찰함과 건설폐기물을 활용한 재생시멘트 개발에 관련된 선행연구를 분석함으로서 재활용 가능한 무기계 건설폐기물에 선정하고 수집하여 분석하였다. 수집된 무기계 건설폐기물의각 화학성분은 XRF장비를 이용하여 분석하였으며, 국내 시판되는 시멘트의 화학성분을 기준으로 무기계 건설폐기물을 조합하여 보그(Bogue)식을 활용한 소성이후 생성되는 클링커(clinker)의 광물성분을 예측 분석하였다. 그 결과, 폐석고보드와 폐천장재가 다량의 산화칼슘(CaO)을 함유하고 있어 시멘트 제조시 중요하게 사용되는 석회석의 대체재로서 활용 가능한 것을 확인하였으며, 이러한 무기계 건설폐기물을 적절히 조합한다면 1종 이외에 다양한 포틀랜드 시멘트 개발도 가능할 것으로 사료된다. 본 연구는 실험적 연구에 앞서 이론적 배합에 관한 연구로 무기계 건설폐기물을 이용한 환경부하 저감형 재생시멘트 개발의 가능여부를 분석하고자 하였다. Until now, the construction material industry has been recognized as a typical environmental destruction industry. However, recently, in order to reduce CO₂ emission, the main cause of environmental problems, lots of studies have been done about recycling industrial by-products and construction wastes. Therefore, the purpose of this study is to confirm whether it is possible to use as an alternative material in cement production process as a part of the development of recycled cement using an inorganic construction waste. For this study, the inorganic construction wastes was collected and analyzed each chemical component by XRF(X-ray Fluorescene). Also, the inorganic construction wastes were combined based on the chemical component of the cement, to perform this analysis. As a result, when the inorganic construction wastes was properly combined, it is possible to consider the development of the recycled cement used the inorganic construction wastes.

국내 유통중인 어패류 섭취에 따른 유기주석화합물의 인체 위해성 평가

최시내,최혜경,송훈,오창환,박종세,Choi, Shi-Nai,Choi, Hye-Kyung,Song, Hoon,Oh, Chang-Hwan,Park, Jong-Sei 한국식품위생안전성학회 2002 한국식품위생안전성학회지 Vol.17 No.3

국내 6개 주요도시에서 조사된 어패류 오염도 현황을 토대로 우리나라 사람들의 어패류 섭취를 통한 유기주석화합물 인체노출량을 예측하고, 이에 따른 위해도를 추계하였다. 본 연구결과를 살펴보면 갈치의 경우, 성인이 식품수급표에서 제시하는 일일섭취량 3.02g/day를 평생 섭취한다는 노출시나리오하에 평균일일노출량은 확률분포로 나타냈을 때 그 중간값이 6.48$\times$ $10^{-7}$ mg/kg/day, 상한치 95th percentile값이 8.78$\times$$10^{-7}$ mg/kg/day로 나타났음을 알 수 있다. 본 연구에서는 비발암독성영향을 평가하기 위하여 BMD$_{10}$ 을 활용한 참고치(Reference dose)를 예측하였다. 이 때 BMD$_{10}$은 10% 비교변화를 BMR으로 하였을때 해당하는 용량의 95% 하한치이다. 본 연구에서 활용한 BMD는 digestion에 의한 근육내의 IgE titer, T.spiraris larvae와 조직학에 의한 근육내 T.spiraris larvae에 근거하여 예측된 것으로 0.03 mg/kg/day이다. 참고치는 BMD$_{10}$ 0.03 mg/kg/day에 불확실성 계수 100을 고려한 값으로 0.003 mg/kg/day이며, 이 때 활용한 불확실성계수는 실험동물에서 인체로의 외삽과정에서 고려한 계수 10과 인구집단 내 민감그룹 고려를 위한 계수 10을 적용한 것이다. 각 어패류의 위험지수(50th percentile)를 살펴보면 고등어에서 2.04$\times$ $10^{-2}$으로 가장 높게 나타났으며, 소라에서 2.70$\times$ $10^{-5}$으로 가장 낮은 값을 나타냈다. Tributyltin compounds have been increasingly used in the form of plastic stabilizers, catalytic agents, industrial agricultural biocides, antifouling paint, and pesticides. Among these organotin compounds, large amounts of tributyltin(TBT) and triphenyltin(TPT) have been used as antifouling agents because they have a superior ability to prevent marine organism from being encrusted on ship bottoms and in culturing nets. Environmental pollution by these organotin compounds in the aquatic environment were undertaken. The international maritime Organization's established a provisional tolerable daily intake(TDI) of 1.6[micro]g TBTO/kg/ B.W. The Food and Agiculture Organization (of the United Nations)/world Health Organization's (FAO/WHO) proposed a TDI of 0.5ug TPT/kg BW/d. This study is conducted monitoring of TBT on seafoods in Korea and risk assessment for exposure on TBT in seafoods. Total hazard index(using Reference Dose : 0.3 ug TBTO/kg B.W/day) of intake exposure on seafoods is 0.04 as the 50th percentile, 0.08 as the 95th percentile. This value is estimated by Monte-Carlo simulation using Crystal Ball(Decisioneering Co., 2001).

산업부산물을 이용하여 제조된 시멘트 클링커의 수용성 6가 크롬 용출 특성

이정희,추용식,송훈,이종규,Lee, Jung-Hui,Chu, Yong-Sik,Song, Hoon,Lee, Jong-Kyu 한국재료학회 2010 한국재료학회지 Vol.20 No.4

Since it was developed by Joseph Aspdin, cement has been a common construction materials up to the present time. However, there are trace constituents in cement clinker. One of the trace constituents included in cement clinker, chromium, has become prominent and highly noticed lately as a social issue both inside and outside of this country because it affects the human body negatively. The aim of the present study was to investigate the concentration of water-soluble hexavalent chromium in cement clinker by using industrial by-products. For that reason, raw materials were prepared to add different $SiO_2$, $Al_2O_3$, and $Fe_2O_3$ sources. After the raw materials such as the limestone, the sand and the clay, iron ore was pulverized and mixed, and the raw meal was burnt at about $1450^{\circ}C$ in a furnace with an oxidizing atmosphere. The part in the raw materials of the clinker was substituted with slag, sludge, etc. and this was used to manufacturing cement clinker. To investigate the water-soluble hexavalent chromium content in clinker, raw meal was prepared by changing the modulus, the type, and the content of clinker materials and tested concentrations of hexavalent chromium in the clinkers. To determine $Cr^{+6}$ formation of the clinker, tests were done with raw meals adding chromium by using different industrial by-products. Consequently because the chromium was to be included in the raw materials of the clinker, production of Portland cement clinker was included with the chromium. Also, the chromium was converted into hexavalent chromium in the burning process.

혼합재 치환율에 따른 경량소재의 물리적 특성

정연조,추용식,이종규,송훈,Jung, Yon-Jo,Chu, Yong-Sik,Lee, Jong-Kyu,Song, Hoon 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.6

Lightweight materials were fabricated using glass abrasive sludge, bottom ash and slag powder in this study. This study tried to draw the correlation between physical properties and internal pore of lightweight material. The content of bottom ash and slag powder was from 10% to 50% and firing temperature from $760{^{\circ}C}\;to\;800{^{\circ}C}$ in rotary kiln. The lightweight material containing bottom ash or slag powder had a specific gravity of $0.21{\sim}0.70$ at particle size $2{\sim}4$ mm. Replacement ratio of the admixture increasing with specific gravity increased. Fracture strength of panel made with various lightweight materials was $32{\sim}55\;kgf/cm^2$ and flexural strength was $11{\sim}18\;kgf/cm^2$. Fracture strength increased by 72% and flexural strength was 63% compared with reference. Thermal conductivities of panel was $0.07{\sim}0.11W/m{\cdot}k$. The water absorption ratios of panel with lightweight materials containing bottom ash were $1.8{\sim}2.8$% and slag powder were $2.65{\sim}2.8$%. Excellent results on resistant of water absorption.

저관전압 흉부 CT검사 시 CT value의 변화에 따른 영상평가

김현주(Hyun Joo Kim),송훈(Hoon Song),조인완(In Wan Cho),안수현(Su Hyeon Ahn),신훈(Hoon Shin),유병헌(Byeong Heon Yoo),김승식(Seung Sik Kim) 대한CT영상기술학회 2007 대한CT영상기술학회지 Vol.9 No.1

Purpose Experiments carried out on the patients who visited this department for pulmonary disease and need CT scans for Follow-up to observe change of CT value, evaluation of image quality and decrease of radiation dose as change of tube voltage Materials and Methods Subjects were the patients of 20 persons visited this department for pulmonary disease and Somatom Sensation 16(Siemens, Erlangen, Germany) was used. Measurement of CT value as change cf tube voltage was done by setting up ROI diameter of 1cm at the height of thyroid, aortic arch, right pulmonary artery in arterial phase image using 100OkVp, measuring 3 times, and recorded the average. CT value of phantom was measured by scanning phantoms which means contrast media diluted by normal saline by various ratio with tube voltage of 80kVp, 100kVp, 120kVp, 140kVp and recorded the average of 3 CT values of center of phantom image. In analysing radiation dose, CTDIvol. values of the latest arterial phase image of 120kVp and as this research set that of 100kVp were analyzed comparatively. 2 observers graded quality of chest images by 5 degrees (UnaccepTable, Suboptimal, Adequate, Good, Excellent diagnostic quality). Results CT value of chest image increased at 100kVp by 14.06%~27.26% in each ROI than 120kVp. CT value of phantom increased as tube voltage lowered at various concentration of contrast media. CTDIbol. decreased at 100kVp(5.00mGy) by 36% than 120kVp(7.80mGy) in radiation dose analysis. here were 0 UnaccepTable, 1 Suboptimal, 3 Adequate, 10 Good, 6 Excellent diagnostic quality in totally 20 persons. Conclusion Chest CT scanning with low kilo-voltage for patients who need CT scan repeatedly can bring images valuable for diagnose, and decrease radiation dose against patients.

쌍태임신 96례에 대한 임상통계학적 고찰

박준홍 ( June Hong Park ),송훈 ( Hoon Song ),고재환 ( Jae Whoan Koh ),김용봉 ( Yong Bong Kim ),이응수 ( Eung Soo Lee ),박성관 ( Sung Kwan Park ) 대한산부인과학회 1997 Obstetrics & Gynecology Science Vol.40 No.12

Twin pregnancies are interesting because of the greater risk to mother and babies than singleton pregnancies. Clinical evaluation with multiple aspects were made on 96 cases of twin pregnancy in Paik Hospital from Jan 1. 1990 to Dec. 31. 1996. The results were as follows: 1. Number of twin pregnancies were 96 cases among 5,321 deliveries. (l:55.4) 2. The predominant age group of gravida was 26 ~ 30 which covers 52.1% of all and mean age was 28.9 years old. According to parity, most frequent group was nullipara which covers 65.3%. 3. The predominent gestational age group of twin births was 35 ~ 36 weeks and mean gestational weeks of twin births was 35(+3). 4. In presentation, the cephalic-cephalic combination was 50% and the cephalic-breech 41.7%. 5. The maternal complications during pregnancy were anemia(55.2%), toxemia(19.8%), and in labor and postpartum state were uterine dysfunction(9.4%), postpartum hemorrhage(21.6%). 6. The most common mode of twin delivery was cesarean section and its incidence was 65.6%. Its main indications were elective, previous cesareansection, malpresentation and preeclampsia. Vaginal delivery was done in 34.4% of the cases, the first baby was 29.2% in spontaneous delivery and 3.1% in vaccum extraction, and the second baby was 18.7% in spontaneous delivery and 11.5% in breech extraction. 7. The average duration of labor was 7.5hours and second baby was delivered within 5 minutes after first baby delivery, in 85.4% of cases. 8. The birth weight of the first and second baby were 2,173 grams and 2,077 grams, respectively and the former washeaiver by 96 grams. 9. In 64.6% of cases, the type of placenta was diamniotic-monochorionic. 10. Both male was 43.8%, both female was 42.7%, and opposite sex was 13.5% in ingant sex. 11. There were 19 perinatal death, its revealing 9.7% of perinatal mortality rate of twin and the most common cause of perinatal death was prematurity with 84.2%. There was one maternal death due to atonic bleeding, and she refused to be transfused because that her religion was Jehovah`s witness.