혈역학적으로 안정된 복부 전벽 자상 환자의 개복 수술 결정에서 Single-contrast CT의 역할

조장환 ( Jang Hwan Jo ),김중석 ( Joong Suck Kim ),김영철 ( Yeong Cheol Kim ),정일용 ( Il Yong Chung ),박종민 ( Jong Min Park ),안은정 ( Eun Jung Ahn ),김은영 ( Eun Young Kim ),박세혁 ( Sei Hyeog Park ),김성엽 ( Seong Yup Kim ) 대한외상학회 2014 大韓外傷學會誌 Vol.27 No.4

Purpose: To assess the accuracy and role of single-contrast computed tomography (CT) in the management of anterior abdominal stab wound (AASW). Methods: During 8-years period, single-contrast CT was performed in 21 hemodynamically stable AASW patients (age range, 22-64 years; median age, 45 years), including 19 men and 2 women. CT scans were evaluated by one trauma surgeon and one senior resident to determine the depth of injury(peritoneal violation or not), and abnormal findings of intraperitoneal cavity associated with stab injury. We retrospectively reviewed medical records regarding operative findings. Results: Nine patients underwent abdominal surgery and 12 patients nonoperative management. In the abdominal surgery group, abnormal CT findings included peritoneal violation in 14 patients and abnormal intraperitoneal cavity findings in 5 patients. There was no statistical significant difference regarding abnormal CT findings between abdominal surgery group and nonoperative management group. Among the nine abdominal surgery patients, therapeutic laparotomy was performed on 4 patients. The positive predictive value (PPV) and negative predictive value (NPV) of peritoneal violation to predictive therapeutic laparotomy were 28.6% and 100%, respectively. In addition, the PPV and NPV of abnormal intraperitoneal cavity CT findings to predict therapeutic laparotomy were 40.0% and 87.5%, respectively. There was no statistical significant difference regarding the abnormal CT findings between therapeutic laparotomy group and non therapeutic laparotomy group. Conclusion: CT is a good adjunctive method to evaluate hemodynamicaly stable AASW patients. If peritoneal violation is not seen on CT scan, conservative treatment on local wound may be safely performed without additional abdominal surgery. However, further study is warranted to evaluate the exact role of CT in the diagnostic workup of AASW patients. [ J Trauma Inj 2014; 27: 145-50 ]

Seniors' Participation in Gardening Improves Nature Relatedness, Psychological Well-being, and Pro-environmental Behavioral Intentions

조장환(Jang-Hwan Jo),Seunguk Shin,손영균(Young-Gyun Son),안병철(Byung-Chul An) 인간식물환경학회 2022 인간식물환경학회지 Vol.25 No.3

Background and objective: Mounting evidence suggests that nature-based recreation such as gardening can generatevarious mental and behavioral benefits. However, the benefits of gardening for older populations are largely unknown. Thisstudy aimed to assess how a seniors' gardening program affects older people's nature relatedness, psychologicalwell-being, and intent to engage in pro-environmental behavior. Methods: We designed a one-group pretest-posttest study. Twelve seniors in their 60s and 70s participated in a gardeningprogram occurring in a university botanical garden for 5 months. We used a 5-point Likert scale to measure the participants'nature relatedness, psychological well-being, and pro-environmental behavioral intentions at the beginning as well as theend of the program. We compared the pretest and posttest scores on each measure using a Wilcoxon signed-rank test fornature relatedness and paired t-tests for psychological well-being and behavioral intentions. Results: Our results indicated statistically significant increases in all three outcome variables after participation in thegardening program. The median score for nature relatedness was 4.167 after program participation compared to 3.500before participation (p < .05). Also, participants' psychological well-being mean score increased from 3.505 to 4.009 (p <.01) while their intent to engage in pro-environmental behavior mean score increased from 4.115 to 4.427 (p < .05). Conclusion: A seniors' gardening program can be an effective way for older people to connect with nature and improve theirmental health. Also, gardening can foster the capacity of the elderly to help reduce human impacts on the environment.

북한 산림전용 방지수단으로서의 REDD 사업의 경제적 타당성 분석

조장환 ( Jang Hwan Jo ),구자춘 ( Ja Choon Koo ),윤여창 ( Yeo Chang Youn ) 한국산림과학회 2011 한국산림과학회지 Vol.100 No.4

This study aims to verify the economic validity of the REDD project in North Korea by estimating the potential carbon credits and the cost of REDD project. The REDD potential credits of North Korea are estimated based on the international statistics of forest area and population from 1990 to 2010, and the cost of REDD project is estimated indirectly by annual land opportunity cost of agriculture assuming that South Korea will aid the food production per area in North Korea. When the 25% reduction scenario was applied to the annual deforestation rate in North Korea, the potential REDD credits were estimated to be 4,232 million~5,290 milliontCO2eq. for 20 years. It would account for 28~35% of South Korea`s national medium-term greenhouse gas reduction target. On the other hand, the break-even price of REDD project was calculated as the profit of agriculture in the land available by forest conversion in North Korea. It was estimated to be 19.19$/tCO2eq. when the non-permanence risk of forest conserved through a REDD contract is assumed to be 20%. This price is higher than the price of REDD carbon credit 5$/tCO2eq. dealt in the 2010 voluntary carbon market, leading to no economic feasibility. However, REDD project provides co-benefits besides climate mitigation. As previous studies indicate, the break-even price is lower than 20$/tCO2eq., which is the social marginal cost of greenhouse gas emissions by loss of forest. Therefore REDD in North Korea can be justified against the social benefits. The economic feasibility of REDD project in North Korea can be largely influenced by the risk percentage. Thus, North Korean REDD project needs a strong guarantee and involvement by the government and people of North Korea to assure the project`s economic feasibility.

팬데믹 확진자 관리 어플리케이션

조장환 ( Jang-hwan Jo ),임현성 ( Hyun-sung Lim ),윤승준 ( Seung-jun Yoon ),임재민 ( Jae-min Im ),이성철 ( Sung-chul Lee ) 한국정보처리학회 2022 한국정보처리학회 학술대회논문집 Vol.29 No.2

어플리케이션을 통해 전염병 및 감염병등을 쉽게 알려줌으로써 전염과 감염에 앞장서서 예방하고 또한 각종 정보들을 빠르게 알려주는 어플리케이션

임업에서의 임가특성 및 지역특성이 소득결정에 미치는 영향: 산촌 및 비산촌지역의 비교를 중심으로

조장환 ( Jo Jang-hwan ),노태우 ( Roh Taewoo ),윤여창 ( Youn Yeo-chang ) 경남대학교 산업경영연구소 2018 지역산업연구 Vol.41 No.3

본 연구의 목적은 임가소득을 결정하는 다양한 요인들을 대상으로 실증분석과 현장검증을 통해 산촌과 비산촌 지역 구분에 따라 임가의 소득 결정에 주요한 영향을 미치는 요인들을 밝히고, 그 영향의 정도를 실증적으로 검증하는 것이다. 선행연구를 통해 임가 소득에 영향을 미치는 다양한 요인들을 분석하고, 임가가 보유한 자본과 전략으로 구분하여 어떠한 요인이 임가소득, 임업소득, 임업외소득, 이전소득에 유의미한 영향을 미치는지를 산촌, 비산촌 지역으로 나눠 분석하였다. 분석결과 행정구역상 산촌 지역, 비산촌 지역에 따라 각각 임가소득, 임업소득, 임업외소득, 이전소득 결정에 미치는 요인과 영향력 정도가 다르게 나타난다는 점을 확인하였다. 연구 결과를 통해 도출된 임가소득 결정 요인에 관한 분석은 임가소득 증진을 위한 정책 수립 시 기초 자료로서 활용될 수 있을 것이다. 아울러 본 연구의 결과들은 정책결정권자 및 임가에게 임가소득 증진에 대한 정량적인 분석결과를 제시함으로써 지속적이고 합리적인 임가소득 증대 정책 마련 및 가구 운영에 도움을 줄 것으로 기대한다. The purpose of this study is to investigate and identify various factors affecting the forestry household income for each income source though empirical analysis and field interviews. To do this, First, the various determinants of forestry household income will be analyzed through the literature reviews. Second, they will be categorized based on the forestry households’ possession of capitals and strategies. Then, two separate analysis for regions in the mountain village and non-mountain village will be conducted to examine the determinants which affect the forestry household income for each income source : forestry income, non-forestry income, and transfer income. The result of the analysis confirms that the determinants and their impact on the various types of incomes are different according to the forestry households’ possession of capitals and strategies, region of forestry household’s field. The determinants of forestry households’ income derived from our study can be used as a basic data for the policy making to increase the income of forestry households. In addition, by providing quantitative analyzed data to policy decision makers and forestry households, we expect our findings to contribute to support the development of sustainable and reasonable forestry household’s income increase policy.

생태계서비스 개념을 반영한 도서 산림 관리 지표 및 도서 산림 유형 구분을 위한 유효 인자 도출

조장환 ( Jang-hwan Jo ),권덕규 ( Deogkyu Kweon ),손영균 ( Young-gyun Son ),이보라 ( Bora Lee ),박찬우 ( Chanwoo Park ) 한국산림경제학회 2022 산림경제연구 Vol.29 No.2

본 연구의 목적은 국내 도서 지역 산림을 대상으로 생태계서비스에 기반한 체계적인 관리 지표체계를 개발하고, 도서 산림 유형 구분을 위한 유효 인자를 발굴하여 지속가능한 도서 산림 관리에 기여하는 데에 있다. 도서 산림에서 관리해야 하는 주요 생태계서비스 지표는 6가지의 산림기능구분과 국내·외 문헌 검토를 기초로 한 전문가 델파이조사를 통해 도출하였으며, 도서 산림 유형 구분을 위한 유효 인자는 전문가 델파이조사 및 기댓값을 활용한 순위 결정법을 통해 도출하였다. 국내 도서 산림에서 중요하게 관리되어야 할 핵심 생태계서비스로 [공급] 천연자원, 약용식물, 담수 및 수원 함양, [조절] 침식조절(토사붕괴 및 유출방지), 생물학적 조절(질병조절), [문화] 경관미·영감, 산림휴양(여가·건강·생태관광), 유산, [지 지] 종을 위한 서식처 관리, 유전적 다양성 유지가 도출되었다. 또한, 도서 산림 유형 구분을 위해 우선적으로 관리되어야 하는 유효인자(육지와의 연결성, 자연식생 구성 비율)를 도출하였다. 본 연구를 통해 도출된 도서 산림 관리 생태계서비스 지표와 유효 인자는 향후 도서 산림 관리를 위한 유형화 구분 기준 및 활용방안에 대한 기초자료로 활용될 수 있을 것이다. This study aims to contribute to sustainable island forest management by developing a systematic management index of indicators based on ecosystem services for domestic island forests and discovering effective factors for classifying island forest types. Major ecosystem service indicators to be managed in island forests were derived from an expert delphi survey on six forest functions and literature review. The effective factor for classification of island forest types was estimated through an expert delphi survey and a ranking method using expected values. Ecosystem services that should be managed importantly in the domestic island forests are as follows: [provisioning] natural resources, medicinal plants, watershed and freshwater, [regulating] erosion control (soil collapse and outflow prevention), biological control (disease control), [cultural] aesthetic appreciation and inspiration, forest recreation (leisure, health, ecotourism), cultural heritage, [supporting] habitats for species, maintenance of genetic diversity. In addition, representative effective factors that should be managed preferentially (land connectivity, natural vegetation composition ratio) were derived. The island forest management ecosystem service index and effective factor verified in this study can be used to provide basic data for classification criteria and utilization methods for future island forest management.

유류 오염토양 세척유출수내 음이온 계면활성제 회수기술의 최적화 연구

최상일 ( Choe Sang Il ),공준 ( Gong Jun ),조장환 ( Jo Jang Hwan ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.5

Monovalent sodium, divalent calcium and trivalent aluminum cations were used to recycle 0.0694M sodium dodecyl sulfate based on stoichiometric level. The calcium and aluminum dodecyl sulfate precipitate has a very low solubility in water and can not be directly recycled to the surfactant based separation. It must be transformed to the monovalent salt before it can be redissolved in water for recycle. Therefore, sodium carbonate solution was added to a slurry of the precipitated calcium and aluminum dodecyl sulfate for optimizing applied sodium carbonate. The washing test was performed to compare recycled anionic surfactants to the original amount. As diesels desorted from diesel containing soil have a sensitive effect on the precipitation of surfactant by hydrophobic affinity, the experiment was also conducted to determine the application range of diesel and minimize recycle loss of anionic surfactant.

포장면 유출 빗물의 특성 변화

최상일 ( Choe Sang Il ),박준형 ( Park Jun Hyeong ),조장환 ( Jo Jang Hwan ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.1

The objectives of this study ware to evaluate the characteristics of rainwater from the paving areas for reusing it. Water samples were collected from two parking areas in K university for eight months (2001. 10 - 2002. 5) to estimate water quality with time. The characteristics of rainfall, run-off rainwater and stored rainwater were compared. The turbidity, pH, electro conductivity of rainfall were analyzed according to intensity and duration. The turbidity, pH, SS, color, oil, quantity of sand, BOD, and COD of run-off rainwater and stored rainwater were investigated. The results showed that pH was 4.13-6.59(rainfall), 7.6 0-8.60(run-off rainwater), and 6.7-8.2(stored rainwater). Also the turbidity of rainwater, run-off rainwater and stored rainwater were 1.25-12.8, 8.0-200 and 5.2-99.6 NTU, respectively.