기체냉매의 PVT 거동을 나타내기 위한 상태방정식

박경근,Park, K.,Sonntag, R.E. 대한설비공학회 1995 설비공학 논문집 Vol.7 No.1

The objective of this work is to investigate the form of equations of state for specific refrigerants. In particular, equations of the extended van der Waals form have been studied. As a result, a new equation of state has been developed and tested over ranges of pressure and density up to 5 and 1.5 times critical, respectively. The equation of state separates the compressibility factor into two parts. One is the repulsive compressibility factor and the other is attractive. The former is in the same form of Carnahan-Starling's repulsive term with constant hard-sphere volume. The latter is based on a combination of two different functions linear to density. The equation of state developed here has 12 adjustable parameters and correlates PVT data successfully. All properties are in reduced forms.

Clausius 부등식의 입증과 비교에 관한 연구

박경근,Park, Kyoung-Kuhn 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2

One Clausius inequality based on an apparatus with a single thermal reservoir is reviewed. Some intricate issues regarding the apparatus are brought up and therefore a preferred way to interpret the Kelvin-Planck statement is suggested. Then it is shown that another Clausius inequality can be established from a direct application of the proposition regarding the efficiency of a Carnot cycle. The establishment is based on an apparatus with two reservoirs, and the resultant inequality involves the temperature of external reservoir. Finally, a different apparatus which also has two thermal reservoirs is utilized to compare the cyclic integral of the former inequality with the one of the latter resulting in the proof of the former inequality which involves the temperature at the system boundary. The applications and limitations of these two Clausius inequalities are discussed.

염증성 치은조직에서 Cell Adhesion Molecule의 발현에 관한 연구

박경근,김은철,유형근,신형식,Park, Kyung-Geun,Kim, Eun-Chul,You, Hyung-Keun,Shin, Hyung-Shik 대한치주과학회 1996 Journal of Periodontal & Implant Science Vol.26 No.3

The change in vascular adhesion molecule expression and number of infiltrating leukocytes were investigated irnmunohistochemically in clinically healthy and inflammed gingiva. Monoclonal antibodies to ICAM-1, VCAM-1 and E-cadherin were used to identify positive vessels and leukocyte within gingival biopsies. 10 healthy gingiva and 30 inflammed gingiva was resected by clinical crown lengthening and modified Widman flap operation, respectively. Leukocyte entry into tissues at sites of inflammation is controlled by the interaction between adhesion molecule and endothelium. Because of rapid and severe destructive periodontal disease that is remarkable leukocyte adhesion deficiency, it is very important to unerdstand the mechanism of host defence against periodontal disease. The purpose of this investigation was the characterization of the presence and distribution of the adhesion molecule(ICAM-1, VCAM-1 and Evcadherin) in inflammatory gingival tissues compared to clinically healthy gingiva. The results were as followed; 1. ICAM-1 was distributed on basal layer, endothelium and mononuclear cells 10 healthy gingiva but inflammed gingiva was observed stronger stain than healthy gingiva. 2. Rare expression was observed in both group but few positive VCAM-1 cells were investigated in inflammatory gingival tissues 3. E-cadherin was expressed in only epithelium and reduced expression was observed in inflammatory gingival tissues. ICAM-1, VCAM-1 showed more expression in inflammatory tissues compared to healthy gingiva. Conversely, E-cadherin revealed a opposite result. These finding demonstrate a characteristic distribution and degree of adhesion molecule in healthy and inflammatory gingival tissues. But it is suggested that more detail study be progressive associated with leukocyte adhesion molecule to determine characterization of periodontal disease.

노인장기요양보험제도 재가급여 이용자의 서비스 만족도 연구

박경근(Park Kyung Keun) 한국복지실천학회 2016 한국복지실천학회지 Vol.7 No.1

This thesis made a study on the satisfaction of Home Visiting Care and Visiting Bath Service users in Namyangju area by studying the 123 of people(male 28 person, female 95 person) using Long-term Care Insurance for the elderly who pay home care service fee. Also, satisfaction with the level of satisfaction by analyzing Long-Term Care Insurance for pensioners receiving services with the development of long-term care insurance for the elderly look at the common characteristics imply and is aimed at. Service satisfaction and welfare benefits, and visit care services and users in home elderly respondents demographic and economic characteristics, and type of service, in order to achieve the purpose of the present study, SPSS statistical characteristics of subjects Satisfaction regression analysis was performed using descriptive statistics, T-test, ANOVA, correlation program. The results of the study are as follows. For the first, the Long-Term Care Insurance user's satisfaction of service contract and all of thing about home visiting care service is divided into 3 subordinate. And suggest each of below factor, question average and standard deviation. The satisfaction of service is average 4.68. As above factor, Satisfaction of home care service is question of 17 of physical activity service(to wash her/him hair, to feed meal, to help her/him bath and so on). Satisfaction of the physical activity service is the most of high percent 4.86. Mentality service(to talk and listen, to counsel and communicate) is 4.69. And last thing that worker keeps user's secret to be exposed during home care service is 4.67. As below factor, Satisfaction of dementia management service is 4.04%. And user's satisfaction of worker's effort. Physical activity service is most of top average as 4.05 and mentality service is average 4.40, personal life service is average 4.46, daily life service is 4.48 on question about home care service. The result shows that home care service is important. Because The result focused on that home care service is more important than out care service like to help go shopping, to help eat out that the demand is small. It is long-term investment to be able to prevent from going out home care service. Second, the difference in home care service user's satisfaction level depending on characteristic of sociology of population shows that the difference between subordinate concepts of each variable is statistically meaningless. But subordinate concepts of each group's difference is meaning. Third, the difference in the satisfaction of home care service users depending on service using pattern did survey 4 question of service user, period, using number, payer. The user's satisfaction is higher when worker services home care service, the using period 12~18months and number of service of 5 days a week. The service fee pay user's son or daughter-in-law. Lastly, analysis of the effect of service user's characteristics on the satisfaction shows that user's characteristic of sociology of population and characteristic of service using pattern affect on the satisfaction of users. In other words, religion, gender, user, period of service use, frequency of service use per week, time of service use per day and total amount of actual costs have an effect on the satisfaction level. As the results, There are some suggestion about policy, practical proposals, and follow-up study. Also, long-term insurance for elderly contribute to not welfare policy for senior but the elderly life. 본 연구는 노인장기요양보험제도가 시행된 2008년 7월 1일부터 경기도 남양주시에서 재가복지 장기요양서비스를 받은 급여 대상자 남자 28명, 여자 95명 전체 123명을 대상으로 직접 면접을 통한 설문을 통해 자료 수집하였으며 제공자가 방문요양과 방문목욕 장기요양서비스를 제공할 때 서비스의 만족도에 대하여 연구 하였다. 또한 장기요양보험제도 이용자가 서비스를 받으면서 만족도의 수준과 만족도를 분석함으로 노인장기요양보험제도의 발전과 일반적인 특성을 살펴보고 함의를 제시하는데 목적이 있다. 본 연구의 목적 달성을 위해 서비스 이용 만족도와 재가복지급여 이용자 및 방문요양서비스를 이용하고 있는 노인을 대상으로 조사대상자의 인구사회학적특성과 서비스 이용형태 특성 대상자의 특성이 만족도에 미치는 영향을 SPSS 통계 프로그램 이용하여 기술 통계 T-test, ANOVA, 상관관계 회귀분석을 진행하였다. 첫째, 장기요양보험제도 대상자의 이용자만족도를 서비스 계약 만족도 및 재가 급여 서비스 만족도, 그리고 전반적 만족도등 3개 3의 하위요인으로 나누고 각 하위 요인별 및 문항별 평균과 표준 편차를 제시 하였고 서비스계약만족도 평균은 4,68으로 나타났다. 하위요인으로서 재가 급여 서비스 만족도는 하위요인을 구성하고 있는 17개문항 중 신체활동지원 서비스가 만족한다. (머리감기기, 식사, 화장실, 목욕도움등)가 4,86로서 가장 높았으며 정서지원 서비스가 만족한다. (말벗, 격려, 위로, 생활상담, 의사소통)가 4,69 높게 나타났으며 제공자는 서비스를 제공 하면서 알게 된 비밀을 잘 지켜서 만족 한다가 4,67 비교적 높게 나타났다. 낮은 점수를 나타낸 문항으로는 치매관리 지원서비스가 만족한다.(행동변화 대처)가 4,04로 나타났고 다음으로 제공자가 이용자가 원하는 서비스를 잘 해주어서 만족 한다가 4,05로 낮게 나타났다. 전반적인 만족도 조사에서는 기관과 계속적으로 관계를 맺으며 서비스를 이용하고자 한다가 4,40로 비교적 보편적으로 나타났다. 또 장기요양 서비스를 받기 전 보다 서비스 받은 후 이용자의 건강과 삶의 질이 향상되어 만족한다가 4,46로 높게 나타났으며 재가급여 서비스에 대해서 전반적으로 만족한다가 4,48로 비교적 높은 편이다. 둘째, 방문요양 서비스이용자의 인구사회학적특성에 따른 만족도 차이를 분석한 결과 각 변인들의 하위집단간의 만족도 차이는 통계적으로 유의미하지 않는 것으로 나타났으나 하위요인별 집단별 차이는 있는 것으로 나타났다. 셋째, 장기요양급여 대상자의 특성이 만족도에 미치는 영향을 분석한 결과 서비스 이용자의 인구 사회학적 특성과 서비스 이용형태 특성이 만족도에 미치는 것으로 나타났다. 즉 종교, 성별 이용자 유형이 주 횟수에 대한 비용부담과 만족도에 대한 영향을 주는 것으로 나타났다. 특히 서비스 이용기간과 횟수는 만족도에 상당한 영향을 주는 것으로 나타났다. 이와 같은 결과를 토대로 정책적 실천적 그리고 후속 연구에 대한 제언이 제시 되었다. 또한 노인장기요양보험제도가 노인들의 삶 뿐 아니라 우리나라 노인복지정책의 효과성을 창출하는데 궁극적으로 크게 기여 할 수 있을 것이다.

포텐셜 필드를 이용한 Deep Q-Learning 기반 무인기의 미사일 회피

박경근(Kyoung Keun Park),김현기(Hyungi Kim) 한국항공우주학회 2020 한국항공우주학회 학술발표회 논문집 Vol.2020 No.11

선형계획법을 이용한 한국형 달 탐사 임무 계획 및 착륙지 선정

박경근(Kyoung-Keun Park),최한림(Han-Lim Choi) 한국항공우주학회 2017 한국항공우주학회 학술발표회 논문집 Vol.2017 No.4

췌장의 낭성종양 2예

박경근(Kyung Geun Park),이옥찬(Ock Chan Lee),함준수(Joon Soo Ham),이민호(Min Ho Lee),이동후(Dong Hoo Lee),기춘석(Choon Suhk Kee),박경남(Kyung Nam Park) 대한소화기학회 1994 대한소화기학회지 Vol.26 No.4

Cystadenomas of the pancreas are uncommon tumors accounting for 5 to 15 percent of pan- creatic cystic lesions with less than 300 exarnples of this entity having been reported in the lit- erature. Cystadenomas are subdivided into microcystic adenoma(serous cystic adenoma) and mucinous cystic adenoma, the former does not appear to have any malignant potential, while the latter has to be considered as potentially malignant. Microcystic adenoma occurs in elderly patients, is twice as common in wornan, and originates from any location in the pancreas. In contrast, rnucinous cystic adenoma prevails in middle aged woman and is located most fre- quently in the body and tail of the pancreas. The tumors are discovered by chance during in- vestigation for causes of the pains. In some cases, the cyst may compress adjacent structures but a palpable mass is uncommon findings. The diagnosis may be suspected clinically, on ultra- sonography, computed tomography and endoscopic retrograde cholangiopancreaticography. We report each case of microcystic adenoma and mucinous cystic adenoma of the pancreas in 31 years old female and 57 years old female with a review of the literatures. (Korean J Gas- troenterol 1994; 26: 751 757)

목포시 부흥산 일대에 분포하는 타포니의 발달 특성과 풍화 과정

박경근(Park, Kyung Geun),신재열(Shin, Jae Ryul) 한국지역지리학회 2019 한국지역지리학회지 Vol.25 No.2

본 연구는 전라남도 목포시 부흥산 일대에 발달하는 타포니를 대상으로 그 발달 특성과 풍화 과정을 고찰하고 있다. 이를 위해 함수율 측정 및 XRF, XRD 분석과 수질 분석을 실시하였다. 분석 결과, 타포니의 발달에 있어서 사면향, 식생의 밀생정도, 풍향 등은 특히 발달 초기 단계에 중요한 영향을 미치는 요인인 것으로 판단되며, 함수율 측정, XRD 분석 및 화학적 풍화 지수(CIA) 등의 결과를 종합하면 타포니 발달 및 암석 풍화 과정에는 물리-화학적 풍화 작용이 복합적으로 영향을 미치는 것으로 생각된다. 또한 XRF 분석 결과 나타나는 높은 Na와 Cl 값은 인접한 해안으로부터 공급된 해염(NaCl)이 침전된 것으로 판단되어, 염 풍화 작용에 의한 암석 풍화 과정도 간접적으로 확인된다. This study identifies the distribution of tafoni at Mt. Buheung in Mokpo, Jeollanam-do and examines its developmental characteristics. For this purposes, measurement of water content rate, XRF, XRD and water analysis were performed. As a result, the distribution of taponi is judged to be primarily affected by the direction of slope, degree of vegetation, wind direction. Also, it is judged by the water content rate, XRD analysis, and the chemical weathering index (CIA) that physical-chemical weathering processes has a complex effect on the development of tafoni in the study area. The high Na and Cl values by XRF analysis indicates sedimentation of sea salt (NaCl) supplied from the adjacent coast.

두 개의 가변 변수가 있는 냉매 증기압 상관식의 성능 평가

박경근(Kyoung Kuhn Park) 대한설비공학회 2012 설비공학 논문집 Vol.24 No.2

Performance of various temperature-dependent vapor-pressure equations with two adjustable parameters is assessed. These are Antoine, Miller, Zia-Thodos, Mejbri-Bellagi and other 10 equations. The equations are fitted to correlate the data from NIST Chemistry WebBook for 43 pure substance refrigerants from the critical point to the triple point. It was found that the Mejbri-Bellagi equation yields the lowest average absolute deviation of 0.37% compared with that of 0.58% of the Miller equation which is known to give better fit to experimental data than the Antoine equation(1.42%) does.

열역학의 엄밀한 내용 전개를 위한 관점에서의 Clausius 부등식의 유도 및 엔트로피의 정의 방법

박경근(Kyoung Kuhn Park) 대한기계학회 2002 대한기계학회 기타 간행물 Vol.2002 No.11