축산농장 배출 가스상 대기오염물질과 기상인자간 상관관계 분석

이성학,김혜승,주흥수 한국냄새환경학회 2020 실내환경 및 냄새 학회지 Vol.19 No.4

The correlation among gaseous air pollutants (odorous compounds, greenhouse gases) and meteorological parameters was analyzed in-depth using measurement data at a barn and ambient in a naturally ventilated dairy farm. Both concentration and emission data (loading rate and emission rate), which more accurately express the actual pollutant emissions, were used in the correlation analysis. Gaseous air pollutants (ammonia, hydrogen sulfide, carbon dioxide, nitrous oxide, methane) and meteorological factors (relative humidity, temperature, wind speed, solar strength) were measured for one week in July 2013. The upper and lower outliers of measured data by inducing 1.5 times the interquartile range (IQR) were eliminated. After eliminating the outliers and grouping according to data magnitude, the correlation analysis among gaseous compounds and meteorological factors was conducted using the average values of each group. In the correlation analysis, data for the emission rate (barn) and the loading rate (ambient) showed a better correlation than concentration data. Gaseous air pollutants except for hydrogen sulfide in the barn showed a good correlation. Hydrogen sulfide might not be produced from manure or animal origin. Rather, the compound may be produced by flushing water, which was flushed at periodical times (every six hours). Ammonia emissions increased with increasing temperature, and this increase can be affected from greater exertion of feces by frequent water drinking in a high-temperature condition. In the ambient, the correlation for all gaseous air pollutants was better than that in the barn, because those air pollutants from manure, animals, and flushing water origins were sufficiently mixed in the atmosphere. Wind speed also showed a good correlation with all gaseous air pollutants.

韓國 行政境域의 接觸性 硏究

李聖學 慶北大學校 1980 論文集 Vol.30 No.-

1. The administrative boundary of Korea in largely established by its topograpical condition, and its social background. However, its administrative districts are analogous to the hexagonal region model of Christraller and Lo¨sch's central place theory as the mean contact number of boundaries is 5 to 6. 2. The correlation coefficient between the contact number of the administrative boundaries and an index of boundary flexure, an index of shape, and area size which are concerned with the contact number is 0.5 respectively on the average. In boundary, and a rank of area size is about 0.8, we find that it applies to the so called "Magnetic Domain Theory". 3. I'll explain later the correlation between the contact of administrative boundary and a transportation sphere, a cultural sphere, and an economic sphere respectively.

농업 부문으로부터 배출되는 초미세먼지 기여 가스상 전구물질에 의한 초미세먼지 배출특성

이성학,주흥수,한진석,Pius M. Ndegwa 한국대기환경학회 2021 한국대기환경학회 학술대회논문집 Vol.2021 No.10

축산 환경에서는 NH₃, SO₂, NO₂, VOC, PM2.5 등 악취 및 대기오염물질들이 배출된다. 이중 이차생성 PM2.5에 영향을 주는 가스상 전구물질(NH₃, SO₂, NO₂)에 대한 연구는 다수 수행되었지만 가스상 전구물질로부터 미세 입자의 형성 경로에 대한 연구는 미비한 실정이다. 본 연구에서는 축산 환경에서 배출되는 이차생성 PM2.5의 배출특성을 파악하기 위해 PM2.5와 가스상 전구물질 및 기상인자간의 상관관계를 분석하였다. 본 연구에서는 2009년 7월 9일~21일까지 미국의 대형 축산 농장에서 수집된 데이터를 사용하였다. 각 물질의 상관관계 분석은 질량농도와 부하속도(Loading rate) 및 배출속도(Emission rate)를 이용하여 진행하였다. 상관관계 분석은 선형 회귀 분석 및 주성분 분석(PCA)을 사용하였다. 다변량 회귀분석을 통하여 가스상 전구물질을 독립 변수로 하여 PM2.5 배출량을 예측하였다. 질량농도로 분석 시 특별한 상관관계는 나타나지 않았지만, 배출속도로 환산하여 분석한 경우 PM2.5와 가스상 전구물질 및 기상인자의 상관관계는 높게 나타났다. 주성분 분석 결과에서도 높은 상관관계를 나타냈으며, 가스상 전구물질 중 SO₂가 PM2.5 생성에 있어 다른 물질에 비해 가장 유의미한 물질로 분석되었다. 기상인자와의 상관관계 분석결과 태양광 세기, 풍속, 온도는 PM2.5 배출속도와 양의 상관관계를 나타냈으며, 태양광 세기와 가장 높은 상관계수를 나타냈다. 반면, 상대 습도는 PM2.5 배출속도와 음의 상관관계를 나타냈다. 다변량 회귀분석을 통하여 축사 및 일반대기의 PM2.5 배출속도를 가스상 전구물질을 사용하여 산출한 예측값과 실제 PM2.5 측정값을 비교한 결과 일반대기에서 보다 축사에서 상관계수가 높게 나타났다. 이는 일반대기에서는 SO₂, NO₂, NH₃의 측정이 수행되지 않았기 때문으로 나타났다.

하천운영시스템 개발에 관한 연구

이성학,홍일표,김형섭,박희성 한국수자원학회 2002 한국수자원학회 학술대회 Vol.2002 No.1

韓國 行政區域名의 歷史 地理學的 硏究 : 「洲」에 對하여 A case of "Ju"(州)

李聖學 慶北大學校 1981 論文集 Vol.32 No.-

1) The character of district name of Korea, "Ju(州)", was different according to the times and regions, that is, "Ju(州)" of Silla(新羅) was a dualistic character of the district names such as "Do"(道) or "Kun"(郡). And "Ju" of "Koryo"(高麗) didn't have "Do"(道) system but had "Kun"(郡) system. Furthermore, "Kun"(郡) system diversed. "Ju" of "Yi" dynasty(朝鮮) was not used as the district-name but as place-name which residents were more than "Mok-Sa"(牧使) rank. So, the use of "Ju(州)" in the end of the region-name reflects the character of history. 2) The variation of the Korean district name is due to the character of society rather than of location. the relative place of the kings household and a meritorious retainer was elevated, meanwhile, the relative place of a traitor was demoted. And, when the district name was changed, the place-name, generally, was changed, too.

KRAS Mutation Test in Korean Patients with Colorectal Carcinomas: A Methodological Comparison between Sanger Sequencing and a Real-Time PCR-Based Assay

이성학,정은선,Arthur Minwoo Chung,이아원,오우진,최영진,이연수 대한병리학회 2017 Journal of Pathology and Translational Medicine Vol.51 No.1

Background: Mutations in the KRAS gene have been identified in approximately 50% of colorectal cancers (CRCs). KRAS mutations are well established biomarkers in anti–epidermal growth factor receptor therapy. Therefore, assessment of KRAS mutations is needed in CRC patients to ensure appropriate treatment. Methods: We compared the analytical performance of the cobas test to Sanger sequencing in 264 CRC cases. In addition, discordant specimens were evaluated by 454 pyrosequencing. Results: KRAS mutations for codons 12/13 were detected in 43.2% of cases (114/264) by Sanger sequencing. Of 257 evaluable specimens for comparison, KRAS mutations were detected in 112 cases (43.6%) by Sanger sequencing and 118 cases (45.9%) by the cobas test. Concordance between the cobas test and Sanger sequencing for each lot was 93.8% positive percent agreement (PPA) and 91.0% negative percent agreement (NPA) for codons 12/13. Results from the cobas test and Sanger sequencing were discordant for 20 cases (7.8%). Twenty discrepant cases were subsequently subjected to 454 pyrosequencing. After comprehensive analysis of the results from combined Sanger sequencing–454 pyrosequencing and the cobas test, PPA was 97.5% and NPA was 100%. Conclusions: The cobas test is an accurate and sensitive test for detecting KRAS-activating mutations and has analytical power equivalent to Sanger sequencing. Prescreening using the cobas test with subsequent application of Sanger sequencing is the best strategy for routine detection of KRAS mutations in CRC.

P/M 2009 Al-SiCp 복합재료의 기계적 성질에 미치는 성형온도의 영향

이성학,신기삼,정동섭 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.1

The present study aims at investigating powder metallurgy (P/M) fabrication processes of high performance 2009 Al composites reinforced with SiC particulates. In particular, the effect of consolidation temperature during the composite processing on microstructure and mechanical properties has been focused on. Rapidly solidified 2009 Al powders produced by commercial atomization technique were mixed with SiC particulates using a fluidized zone mixer. Composite billets were consolidated using a vacuum hot press at the temperature range from 560℃ to 620℃ under the pressure of 50 MPa, and then extruded at 450℃. Using the hot pressing temperature of 560℃, good quality Al-SiCp composite billets having relatively homogeneous microstructure and sound Al/SiC interfacial bonding were obtained, while the composite billets consolidated at the higher temperatures contained SiC depleted regions because of the larger amount of liquid. These SiC depleted regions were not removed during the extrusion process, resulting in the unhomogeneous distribution of SiC particulates. The better mechanical properties of the extruded bars were achieved in the composites fabricated with the lower consolidation temperature since they had the uniform distribution of SiC reinforcements together with full densification. Microstructure and mechanical properties were compared with those of the composites processed by Advanced Composite Materials Corp. or the composites reinforced with SiC whiskers so as to obtain a proper perspective of the Al-SiC composites.

정밀주조된 Ti-6AI-4V 합금 용접부의 피로성질

이성학,김낙준,오진근,이의휘 대한금속재료학회(대한금속학회) 2001 대한금속·재료학회지 Vol.39 No.10

The effects of microstructural factors on high-cycle fatigue properties and fatigue crack propagation behavior of welded regions of a cast Ti-6Al-4V alloy were investigated in this study. High-cycle fatigue test and fatigue crack propagation test were conducted for the welded regions, which were processed by two different welding methods, i.e., tungsten inert gas (TIG) welding and electron beam (EB) welding, and then the test data were analyzed in relation to microstructures, tensile properties, and fatigue fracture mode. The base metal was composed of Widmansta¨tten structure, while the EB and TIG welds consisted of basket-weave type structure having thin α platelets. The high-cycle fatigue results indicated that fatigue strength of the EB weld was lower than that of the base metal or the TIG weld because of the existence of coarse pores formed during welding, although it had highest yield strength. In the case of the fatigue crack propagation, the EB weld composed of very thin α platelets had the faster crack propagation rate than the base metal or the TIG weld. The effective microstructural factor determining the fatigue crack propagation rate was found to be the width of α platelets because it was well matched with the reversed plastic zone size calculated at near-threshold ΔK.

노인의 유료 양로서비스 이용 및 의사결정 과정별 결정요인

이성학 한국사회보장학회 1998 社會 保障 硏究 Vol.14 No.1

This study intended to understand the factors influencing the utilization of charged retirement home services for the elderly by stage of discision making. The purpose of this study is to measure the demand and to identify factors influencing the utilization of charged retirement home services of the elderly by stage of decision making. The results of this study were as follows. 1. To identify the factors influencing the utilization of charged retirement home services, non-utilizer(N=471) and utilizer (N=50) were analyzed by x²-test, t-test, multiple logistic regression. Significant factors were age (B = 0.230), partner (B = 2.756), income (B = 1.069), need of charged retirement home(B = 1.172), significant othes (B = 0.268), locus of control (B = -0.589). 2. The factors influencing the recognition of residence problem were house satisfaction(B = -0.226), need of charged retirement home (B = 0.283). 3. The factors influencing the selection of charged retirement home as an alternative to solve the residence problem were adult residence (B = -0.774), house satisfaction(B = 0.222), significant others (B = 0.127). 4. The factors influencing the dicision-making of the utlization of charged retiremet home were adult children-married (B = 1.845), charged ability of utilization(B = -1.129), effect of utilization (B = 0.672). 5. The factors influencing the actualization of utilizing were age(B = 0.277), partner(B = 4.891), income(B = 1.505), need of charged retirement home (B = 0.997).

韓國의 行政區域에 關한 硏究 : 주로 역사지리학적 고찰

李聖學 慶北大學校 1972 論文集 Vol.16 No.-

(1) Administrative district of Korea has been changed by periodic term of bureaucratic system and social system. Untill last period of Lee dynasty there was homoge neitic structure such as Ju(州), Mok(牧), Bu(府), Gun(郡), Hyun(縣), but under the Japanese colonial goverment this system was dismished and replaud subordinate system such as si(市) or Gun(郡), Eup(邑) or Myun(面), Ri(里) or dong(洞). This system has become the basic pivot of recent administrative district. (2) In the hieratic change of administrative district, the significance of geographic pattern was neglected and birth place of land lord, meritorious retainer and insurgent was deeply considered, as result of it there were off bodering area and saw shaped district which neglected geographical characteristics. (3) Result which regional differences of administrative district was calculated by correlation of important geographical factors and standard deviation, generally positive relation between financial degree and population but negative relation between financial degree and area. Because area has negative relation with population, the more regional differences of population is the more differneces of financial degree.