단판 적층성형 학생용 책상.의자의 제조적성

서진석,박종영,한기만,Suh, Jin-Suk,Park, Jong-Young,Han, Ki-Man 한국가구학회 2005 한국가구학회지 Vol.16 No.2

As physical condition of students improves, there is a need to develop human body-friendly desk and chair for students. In this study, desks and chairs were manufactured with curved veneer lamination under high frequency heating and pressing, using ten wood species such as Japanese red pine, Korean pine, pitch pine, Japanese larch, yellow poplar, black locust, oak, radiata pine, beech, and birch. The performance of these products were evaluated. The results obtained were summarized as follows; With high frequency heating, the turned lamination of veneers with full size sheet ($3{\times}6\;feet$) prepared by rotary lathe peeling was successfully applied for making the members of desk top, leg frames of desk and chair. Bending strengths of desk tops were relatively greater for yellow poplar, black locust and red pine, which were similar to those of beech and birch. Bending strengths of desk legs were classified into greater species group (red pine, yellow poplar, larch) and lower species group (radiata pine, Korean pine, pitch pine). Compressive strengths of chair legs in parallel direction to the lamination were greater in black locust and larch. On the other hand, differences between outer and inner gap at the top and drawer bottom of desk top were rather larger for the laminations of birch and beech, and less for those of yellow poplar and pitch pine, showing greater stability of open drawer space. In results, yellow poplar, larch, pitch pine and red pine showed good appearance and strength properties at the curved veneer lamination. Accordingly, it was believed that these domestic woods were able to substitute for birch which was being imported for the use of veneer-laminates type furniture.

SWG 추진을 위한 다중수원 워터루프 시스템 관련 법제도 개선방안

서진석,김영화,한국헌,김동환,Suh, Jin Suhk,Kim, Young Hwa,Han, Kuk Heon,Kim, Dong Hwan 한국관개배수위원회 2014 한국관개배수논문집 Vol.21 No.1

Recently drastic climate changes(e.g., extreme floods and droughts) are often taking place around the world. Even an increase in uncertainty, population, and mega cities has caused drastic changes in water recycle process. As in other countries, Korea has faced some issues relevant to water security. In response to these changes, Smart Water Grid(SWG) system combining the current water resources management with ICT (Information and Communications Technology) is considered as a new paradigm for the Korean water resources management. This study aims to explore and identify influential factors contributing to the SWG system's application to analyze the importance and role of those factors, and then to offer a policy suggestion for the successful application of the SWG system along with legislative improvements in Korea. In this study, we looked at different barriers related to the SWG application and also the complicated Korean water laws, enacted by different ministries and in order to efficiently apply the SWG system to the current Korean water resources management structures. This study employed qualitative research methods to analyze and identify the priorities of the tasks to be implemented by analyzing conditions for the SWG application, especially related to multi water sources and micro water grid, because legal and institutional measures can be more important to manage conflicts between different stakeholders once the SWG enters a phase of standardization and commercialization from its development stage.

간질성 폐섬유화증의 병리조직학적 검색

서진석 ( Jin Suk Suh ),함의근 ( Eui Keun Ham ) 대한결핵 및 호흡기학회 1990 Tuberculosis and Respiratory Diseases Vol.37 No.2

원통형 단판적층재의 접착성 및 도장처리에 따른 표면내구성

서진석 ( Jin Suk Suh ),김종인 ( Jong In Kim ),황성옥 ( Sung Wook Hwang ),박상범 ( Sang Bum Park ) 한국목재공학회 2012 목재공학 Vol.40 No.6

원통형 단판적층재(LVL)의 구조재 이외의 공예재 등의 용도개발을 위하여 원통형 단판적층재의 내수접착성과 도장처리에 따른 내마모성 및 표면경도를 측정하였다. 레조시놀 수지와 경화제(paraformaldehyde)를 100 : 5의 혼합비로 하여 접착·경화한 원통형 단판적층재의 전체적인 접착층에 대한 삶음박리 접착력은 양호한 편이었다. 내마모성은 횡단면이 접선단면보다 상대적으로 우수하였으며, 접선단면에 자외선 차단 오일을 도장 처리한 경우 내마모성이 향상되었다. 표면경도는 횡단면의 경우, 낙엽송 중심재가 라디에타소나무 단판적층 부위보다 높았고, 접선단면의 경우에는 접착층 부위가 단판부위보다 높게 나타났다. In order to develop the end use of cylindrical laminated veneer lumber LVL) such as wooden crafts, the water proof-bonding strength, the resistance to abrasion and the surface hardness by painting the surface of LVL were investigated. The study results were as follows: The water proof-bonding strength through 5 cyclic test by boiling in water immersion and drying were favorable without delamination of glue line. Then the formulation of glue was resorcinol resin (100) to hardener of paraformaldehyde(5)by mixed weight percentage. The resistance to abrasion was relatively higher at cross section than tangential section. When tangential section of LVL was painted by UV protection oil, the resistance to abrasion was improved. In case of a cross section of LVL, the higher surface hardness appeared at larch core than radiate pine LVL. Also, in case of a tangential section of LVL, the higher surface hardness appeared at glue line veneer side.

합판분야의 연구동향과 전개방향

서진석 ( Jin Suk Suh ) 한국목재공학회 1994 목재공학 Vol.22 No.3

라디에타소나무 단판적층재의 밀도,접착,강도성능 및 내부후성

서진석 ( Jin Suk Suh ),이동흡 ( Dong Heub Lee ),황원중 ( Won Joung Hwang ),오형민 ( Hyung Min Oh ),박영란 ( Young Ran Park ),강승모 ( Sung Mo Kang ) 한국목재공학회 2011 목재공학 Vol.39 No.4

라디에타소나무 단판적층재(LVL)를 제조함에 있어서, CuAz 및 ACQ 방부처리와 비처리, 수성비닐우레탄 접착제와 페놀변성 리조시놀수지 접착제의 상온경화형 접착제를 적용함에 따른 밀도경사, 접착·강도성능 및 내부후성(방부효력)을 살펴보았다. 결과, LVL의 밀도경사에서 접착층 주변이 원추형으로 밀도가 커지는 경사패턴을 보였다. 접착성은 수성비닐우레탄 접착의 경우, 자비반복시험 후 전층이 박리되거나, 일부 층이 박리하고 할렬·틈새 현상이 일어났다. 페놀변성 리조시놀수지 접착제 접착의 경우, 자비반복시험 후 접착층의 응력이 큰데 연유한 굽음과 상하 접착층 사이의 단판의 수직할렬 현상이 있었으나, 접착층의 박리나 할렬이 거의 발견되지 않아 침지박리접착력은 높은 것으로 판단되었다. 한편, 방부효력시험에 있어서, 수성비닐우레탄 접착제로 적층한 LVL의 경우 갈색부후균에 의한 부후도가 백색부후균보다 크게 나타났다. 페놀변성 리조시놀수지 접착제로 LVL을 제조한 경우에는 갈색부후균에 의한 질량감소가 적었고, 약제를 처리하지 않더라도 그 피해가 낮았으며, 약제처리한 것은 질량감소율 0 수준을 보일 정도로 방부효력이 큰 것을 알 수 있었다. In this study, LVLs of radiata pine were fabricated with non-preservative treated veneers, CuAz treated veneers, and ACQ treated veneers, using aqueous vinyl urethane adhesive and phenol modified resorcinol resin adhesive. Then density gradient, bonding strength, bending properties and decay resistance of LVLs were evaluated. As results, the cone-shaped and higher density gradient pattern was found in layer close to glueline. After cyclic water boiled test, the LVL bonded with aqueous vinyl urethane resin adhesive was delaminated in all layers or partly delaminated including check, chasm in glueline layer. In the case of LVL bonded with phenol modified resorcinol resin adhesive, despite slight cupping due to great glueline stress and vertical check between glueline layers, it was observed that the bonding strength to delamination was higher, owing to most absence of delamination through overall glueline. On the other hand, in the decay test, mass loss by brown rot fungi was greater than white rot fungi in LVL bonded with aqueous vinyl urethane resin adhesive However, in LVL bonded with phenol modified resorcinol resin adhesive, the mass loss by brown rot fungi was slight and non-preservative treated LVL was low. The mass loss of preservative-treated LVL was 0 (zero), showing the high decay resistance effect.

OSB 대체용 국내산 합판의 못 접합부 전단내력 성능

서진석 ( Jin Suk Suh ),황성욱 ( Sung Wook Hwang ),황권환 ( Kweon Hwan Hwang ),정기영 ( Gi Young Jeong ),정하현 ( Ha Hyun Joung ) 한국목재공학회 2012 목재공학 Vol.40 No.4

본 연구에서는 현재 국내 목조건축에서 벽구성 재료로 많이 사용되고 있는 수입 OSB(배향성 스트랜드보드)를 국산 합판으로 대체하기 위해 OSB와 국산 합판의 못 접합부 전단성능을 비교·검토하였다. 주부재(잣나무)와 측면부재(OSB·합판)의 섬유 방향성(평행·직각)에 따른 전단성능은 합판에서 현저하였다. 결과, OSB와 합판 모두 현행 국내 기준인 못 접합부 기준 허용전단내력을 만족하는 것으로 나타났다. 그리고, 표면층에 MLH(열대산 활잡목)를 사용하고 7ply 구성한 합판(P-4 type)은 OSB보다 섬유방향에 관계없이 큰 전단성능을 나타냈다. 전반적으로 측면부재로서 합판을 사용할 경우 주부재에 대하여 섬유방향을 직교되도록 구성할 경우,평행방향 구성보다 큰 전단성능을 발휘할 수 있음이 확인되었다. This study was carried out in order to compare nail shear strength between domestic plywood and imported OSB for structural sheathing members as infill wall of wooden construction. The differences of nail shear strength between parallel-to-grain direction and perpendicular-to-grain direction of sheathing material to frame material were distinct at the plywood composition. The shear strengths of plywood and OSB with nail met current design values. The plywood of P-4 type, which uses MLH at surface layer and constructs 7 ply, showed greater than OSB regardless of grain direction of sheathing material to frame material. When the plywood as sheathing material to frame material was used, it was found out that the overall construction of perpendicular-to-grain direction of plywood had greater nail shear strengths than the construction of parallel-to-grain.

스마트 물 관리 기술을 이용한 지속 가능한 발전: 파주 스마트워터시티 사례 중심으로

서진석(Suh, Jinsuhk),이수국(Yi, Sukuk),박세영(Park, Seyoung) 대한토목학회 2016 대한토목학회 학술대회 Vol.2016 No.10

Adaptive Approach to Water Resources Management in Korea

Suh, Jinsuhk(서진석) 한국공공관리학회 2015 한국공공관리학보 Vol.29 No.4

한국의 수자원 관리에 있어서 현재 직면하고 있는 문제는 기후변화로 인해 야기될 ‘불확실성(Uncertainty)’과 1980년대 이후 정치 · 사회 · 경제 분야의 급속한 변화에 따른 ‘복잡성(Complexity)’이다. 이러한 불확실성과 복잡성의 문제 해결을 위해서는 현재의 경직되고 중앙 집중적인 수자원 관리 시스템에서 보다는 유연하게 대처하고 변화에 적응할 수 있고 분산된 수자원 관리 방식으로의 전환이 필요하다. 이는 수자원관리 및 물정책에 있어서 지금까지의 하향식 체계에서 벗어나 보다 많은 참여와 학습을 통한 관리 방식으로의 패러다임 전환을 의미한다. 사회학습과 참여에 의한 적응형 관리 방식으로의 전환은 다양한 이해관계자의 적극적인 참여와 더불어 과거의 경험에 따른 학습효과를 통해 관리방식을 보다 능동적으로 변화시킨다는 것을 의미한다. 특히 한국의 수자원 관리에 있어서 이러한 변화의 목적은 다양한 규모의 하천유역 관리에 있어서 변화에 따른 적응력(Adaptive Capacity)을 증대시키는 것이라 할 수 있다. 본 연구는 적응형 수자원 관리가 한국과 같은 중앙 집중적인 수자원 관리 체계에서 기후변화로 인한 불확실성에 어떻게 대처할 수 있는지를 살펴보고, 더불어 다각적인 의사결정 과정과 구조적 변화가 과거로부터의 학습과 다양한 관점을 수용할 때, 지속가능한 하천유역 관리를 실현할 수 있음을 보여준다. 결론적으로 한국의 수자원 관리 경험을 고려해 볼 때, 적응형 접근방식은 한국의 수자원 관리에 적절하게 융합될 수 있으며, 이러한 적응형 방식은 한국 수자원 관리 시스템에 내재하고 있는 외부적 불확실성과 내부적 불가변성을 해소할 뿐만 아니라 새로운 변화에 대한 대처방안 될 수 있다. 더 나아가 적응형 수자원 관리 방식은 통해 한국과 유사한 수자원 관리 문제를 가지고 있는 개발 도상국가의 수자원 관리 분야에 있어서 사회 · 정치적 형평성과 환경적 지속가능성을 실현시키는데 바람직한 접근방식이라 할 수 있다. In Korea, water resources management is facing diverse water issues due to ‘uncertainty’ led by climate change and has been suffered from ‘complexity’ by rapid change of socioeconomic boundary conditions since the 1980s. More attention has to be focused on understanding and managing a shift from the centralized water management systems to more adaptive and decentralized management. This refers to a paradigm shift in water resources management / water policy from a command-and-control to a management as learning and participatory approach. The change towards adaptive management via social learning and participation could be described as “learning to manage by managing to learn, with active participation”. Such change aims to improve the adaptive capacity of river basins at different scales. This paper explores whether the adaptive water resources management can cope with uncertainty from climate change in the centralized water management of Korea. Also, we contend that multiple processes and structural changes can sustain the capacity of different authorities, experts, stakeholders, and the public to better manage river basins by embracing different perspectives and learning from past experiences. We conclude that an adaptive approach may be occurring, and Korea’s experience shows that such adaptive management can be an alternative to lead a new reform as well as to solve external uncertainty and internal inflexibility in Korea’s water management system. Also, it can be seen as a desirable approach to realize social·political equity and environmental sustainability for other developing countries with the similar water management issues.

Quantitative Assessment of Synovial Vascularity Using Contrast-Enhanced Power Doppler Ultrasonography: Correlation with Histologic Findings and MR Imaging Findings in Arthritic Rabbit Knee Model

이상훈,서진석,신명진,Seong Moon Kim,김남국,Sang Hyun Suh 대한영상의학회 2008 Korean Journal of Radiology Vol.9 No.1

Objective: To validate contrast-enhanced power Doppler ultrasonography (PDUS) for the evaluation of synovial vascularity in an arthritic rabbit knee model in correlation with MR and histological findings. Materials and Methods: Power Doppler ultrasonography was performed for carrageenin-induced arthritic left knee and control right knee of 13 rabbits, first without and then with sonic contrast agent enhancement (Levovist, Schering, Berlin Germany), followed by gadolinium-enhanced MR imaging. Synovial vascularity was quantitatively assessed by calculating the color pixel area in power Doppler sonography using a computer-aided image analysis program and by grading the enhancement on MR images: grade 1, enhancement of knee joint is less than one-third of the area; grade 2, one-third to two-thirds enhancement; and grade 3, more than two-thirds enhancement. Microvessel density (MVD) was measured on slides stained immunohistochemically for CD31 antigen for histological assessment. Results: The mean area of color pixels in PD US changed from 4.37 to 16.42 mm2 in the arthritic knee after enhancement (p < 0.05), whereas it changed from 0.77 to 2.31 mm2 in the control knee (p < 0.05). Arthritic knees had greater power Doppler signal than control knees both before and after contrast administration (p < 0.05). The average MVD was 88 in arthritic knees and 46 in control knees. MVDs correlated with color pixel areas of contrast-enhanced power Doppler imaging in arthritic knees. In MR grading of arthritic knees, five were grade 2 and eight were grade 3. MVD and PD US revealed no significant difference between grade 2 and 3 arthritic knees (p > 0.05). Conclusion: Sonic contrast-enhanced PD US improves the visualization of synovial vascularity and allows quantitative measurement in experimentally induced rabbit arthritic knees.