Yunus Kara - Academia.edu (original) (raw)
Papers by Yunus Kara
Acta Crystallographica Section E-structure Reports Online, 2003
ABSTRACT
Falls are identified as a major health risk for the elderly and a major obstacle to independent l... more Falls are identified as a major health risk for the elderly and a major obstacle to independent living. Considering the remarkable increase in the elderly population of developed countries, methods for fall detection have been a recent active area of research. However, existing methods often use only wearable sensors, such as acceloremeters, or cameras to detect falls. In this demonstration, in contrast to the state of the art solutions, we focus on the use of multi-modal wireless sensor networks within the WeCare framework. WeCare system is developed as a solution for independent living applications by remotely monitoring the health and well-being of its users. We describe the general structure of WeCare and demonstrate its fall detection method. Our set-up not only includes scalar sensors to detect falls and motion but also consists of embedded cameras and RFID tags and uses sensor fusion techniques to improve the success of fall detection and minimize the false positives.
This paper describes our method to fit a 3D skeleton to the human hand using depth images. The hu... more This paper describes our method to fit a 3D skeleton to the human hand using depth images. The human hand is represented by a 3D skeleton with 21 parts. This model is used to generate synthetic depth images, that are used to train Random Decision Forests (RDF), which are used to assign each pixel to a hand part. Mean-shift method is used on the classification results and joint locations are estimated. The system can run in real time at 30 fps on Kinect depth images. We use this method and Support Vector Machines for classification and obtain 99.9% recognition rate on the American Sign Language (ASL) digit recognition problem.
Real-time 3D motion capture for the human hand opens many avenues for HCI. This work describes ou... more Real-time 3D motion capture for the human hand opens many avenues for HCI. This work describes our framework for fitting a 3D skeleton to the human hand using depth images. We represent a human hand by a 3D skeleton with 15 joints. Using this model, various synthetic depth images are generated. Random Decision Forests (RDF) are trained and used to assign each pixel to a hand part. A mean-shift method is used for estimating joint locations using pixel classification results. Our system runs in real time at 30 fps on Kinect depth images.
... Human Action Recognition in Videos Using Keypoint Tracking Yunus Emre Kara, Lale Akarun Bilgi... more ... Human Action Recognition in Videos Using Keypoint Tracking Yunus Emre Kara, Lale Akarun Bilgisayar Mühendisli˘gi Bölümü Bo˘gaziçi ¨Universitesi, ˙Istanbul yunus.kara@boun.edu.tr, akarun@boun.edu.tr ... 32-36 Vol.3, IEEE, 2004. [13] Alemdar HO, Kara YE, Ozen MO, et al. ...
... Lale Akarun Bo˘gaziçi University Computer Engineering Department, 34342, Istanbul, Turkey kes... more ... Lale Akarun Bo˘gaziçi University Computer Engineering Department, 34342, Istanbul, Turkey keskinc@cmpe.boun.edu.tr, {kiracmus, yunus.kara, akarun}@boun ... The authors detect hands by thresholding the depth data and use Chamfer distance to measure shape sim-ilarity. ...
Frontiers in Natural Product Chemistry, 2005
Abstract: All of the possible conduritol isomers have already been synthesized starting from comp... more Abstract: All of the possible conduritol isomers have already been synthesized starting from completely different materials and their biological importance studied. Conduritols are useful precursors in the preparation of cyclitols such as myo-inositols phosphates, and pseudo-sugars, ...
Organic Letters, 2006
[reaction: see text] A new and stereospecific synthesis for bis-endoperoxide has been developed s... more [reaction: see text] A new and stereospecific synthesis for bis-endoperoxide has been developed starting from tetrahydronaphthalene. Photooxygenation of tetrahydronaphthalene resulted in the formation of hydroperoxy-endoperoxide. The bromination reaction of hydroperoxy-endoperoxide gave bis-endoperoxide, whose exact configuration has been determined by X-ray analysis. The lowest-energy conformer of bis-endoperoxide is the boat-chair form.
Tetrahedron, 2003
... Yunus Kara a and Metin Balci Corresponding Author Contact Information , E-mail The Correspond... more ... Yunus Kara a and Metin Balci Corresponding Author Contact Information , E-mail The Corresponding Author , b. ... Abstract | PDF (323 K) | View Record in Scopus | Cited By in Scopus (21) T. Hudlicky, M. Mandel, J. Rouden, RS Lee, B. Bachmann, T. Dudding, KJ Yost and JS ...
Journal of Chemical Research-s, 2010
A Novel and Stereospecific Synthesis of Aminocyclitol: N-Tosyldihydroconduramine E2. -The title c... more A Novel and Stereospecific Synthesis of Aminocyclitol: N-Tosyldihydroconduramine E2. -The title compound (VIII) is stereospecifically synthesized using the Pd(0) catalyzed cyclization reaction of allylic cis-diol (X) as the key step. -(KELEBEKLI*, L.; CELIK, M.; KARA, Y.; J. Chem. Res. 34 (2010) 1, 54-56; Dep. Chem., Ordu Univ., Ordu, Turk.; Eng.) -A. Forchert 27-184
Tetrahedron, 2003
The electrophilic addition of bromine to an exocyclic diene, 5,6-dimethylenebicyclo[2.2.1]hept-2-... more The electrophilic addition of bromine to an exocyclic diene, 5,6-dimethylenebicyclo[2.2.1]hept-2-ene, in CCl 4 at 08C led to the formation of non-rearranged (73%) and rearranged products (27%). However, high temperature bromination of the exocyclic diene at 778C suppressed the formation of the rearranged products. Similarly, bromination of 9,10-dimethylenetricyclo[6.2.1.0 2,7 ]undeca-2,4,6-triene at 2108C gave only the exo-1,2-addition product. Bromination at þ58C resulted in the formation of a mixture consisting of exo-1,2-and 1,4addition products in a ratio of (1:4). High temperature bromination at 778C resulted in the formation of the endo-1,2-addition product. Furthermore, it has been shown that the 1,4-addition product converts smoothly to the 1,2-addition product. The formation mechanism of the products is discussed and supported by calculations. q
Beilstein Journal of Organic Chemistry, 2010
A new class of aminocyclitol derivatives with the bicyclo[4.2.0]octane skeleton was synthesized s... more A new class of aminocyclitol derivatives with the bicyclo[4.2.0]octane skeleton was synthesized starting from cyclooctatetraene. Photooxygenation of trans-7,8-diacetoxyand cis-7,8-dichlorobicyclo[4.2.0]octa-2,4-diene afforded the bicyclic endoperoxides. Reduction of the latter with thiourea followed by a Pd(0) catalyzed ionization/cyclization reaction gave the corresponding oxazolidinone derivatives. Oxidation of the double bond with KMnO 4 or OsO 4 followed by acetylation gave the acetate derivatives, the exact configuration of which was determined by spectroscopic methods. Hydrolysis of the oxazolidinone rings and removal of the acetate groups furnished the desired aminocyclitols.
Acta Crystallographica Section E-structure Reports Online, 2008
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.063; wR... more Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.063; wR factor = 0.154; data-to-parameter ratio = 24.8.
Journal of Molecular Structure, 2011
Two new deoxycarbaheptopyranoses, 5a-carba-6-deoxy-a-DL-galacto-heptopyranose and 5a-carba-6deoxy... more Two new deoxycarbaheptopyranoses, 5a-carba-6-deoxy-a-DL-galacto-heptopyranose and 5a-carba-6deoxy-a-DL-gulo-heptopyranose were prepared starting from cyclohexa-1,4-diene. The addition of dichloroketene to cyclohexa-1,4-diene followed by the subsequent reductive elimination and Baeyere Villiger oxidation in turn led to the formation of a bicyclic lactone. Reduction of the lactone moiety followed by acetylation gave a diacetate with cis-configuration. The introduction of additional acetate functionality into the molecule was achieved by singlet oxygen ene-reaction. The formed hydroperoxide was reduced and then acetylated. The triacetate was further functionalized either by direct cishydroxylation using OsO 4 or by epoxidation followed by a ring-opening reaction to give the title heptopyranose derivatives. One of the synthesized molecules, galacto-heptopyranose exhibited enzyme specific inhibition against a-glycosidase. On the other hand, they did not show any inhibition for a-amylase. However, both compounds, gulo-heptopyranose and galacto-heptopyranose increased the activity of a-amylase. .tr (M. Balci). y Author to whom inquires concerning the X-ray structure should be directed.
Helvetica Chimica Acta, 2006
![Research paper thumbnail of 1,2-Dibromo-5-(4-tolylsulfonyl)-2,2a,4a,5,7a,7b-hexahydro-1 H -7-oxa-5-azacyclobuta[ e ]inden-6-one](https://attachments.academia-assets.com/49494755/thumbnails/1.jpg)
](Acta Crystallographica Section E-structure Reports Online, 2007
Journal of Chemical Research-s, 1997
ABSTRACT
Carbohydrate Research, 2005
Bis-homoconduritol derivatives with conduritol-A, -D, and -F structures have been synthesized sta... more Bis-homoconduritol derivatives with conduritol-A, -D, and -F structures have been synthesized starting from cyclooctatetraene. The photooxygenation of trans-7,8-dibromo- and cis-7,8-dichlorobicyclo[4.2.0]octa-2,4-dienes afforded the bicyclic endoperoxides. Reduction of the endoperoxides with thiourea followed by acetylation gave the corresponding diacetates. The KMnO(4) oxidation and epoxidation of the diacetates followed by acetylation gave the tetraacetates. Removal of the halides either with zinc-dust or Na-anthracene followed by the ammonolysis of tetraacetates afforded the bis-homoconduritol derivatives in high yield.
Journal of Chemical Research-s, 2002
Syntheses of and Photochemical Studies of 2,3-Disubstituted 1,4-Epoxy-1,4-dihydronaphthalenes. -T... more Syntheses of and Photochemical Studies of 2,3-Disubstituted 1,4-Epoxy-1,4-dihydronaphthalenes. -The photolysis of the title compounds, e.g. (VIII), yields indene derivatives such as (IX) and (X) (no yields given) rather than the expected benz[f]oxepins. -(ALTUNDAS, A.; KARA*, Y.; SECEN, H.; AKBULUT, N.; J. Chem. Res. , Synop. 2002, 8, 361-362; Dep. Chem., Atatuerk Univ., TR-25240 Erzurum, Turk.; Eng.) -Schulze 04-108
Acta Crystallographica Section E-structure Reports Online, 2003
ABSTRACT
Falls are identified as a major health risk for the elderly and a major obstacle to independent l... more Falls are identified as a major health risk for the elderly and a major obstacle to independent living. Considering the remarkable increase in the elderly population of developed countries, methods for fall detection have been a recent active area of research. However, existing methods often use only wearable sensors, such as acceloremeters, or cameras to detect falls. In this demonstration, in contrast to the state of the art solutions, we focus on the use of multi-modal wireless sensor networks within the WeCare framework. WeCare system is developed as a solution for independent living applications by remotely monitoring the health and well-being of its users. We describe the general structure of WeCare and demonstrate its fall detection method. Our set-up not only includes scalar sensors to detect falls and motion but also consists of embedded cameras and RFID tags and uses sensor fusion techniques to improve the success of fall detection and minimize the false positives.
This paper describes our method to fit a 3D skeleton to the human hand using depth images. The hu... more This paper describes our method to fit a 3D skeleton to the human hand using depth images. The human hand is represented by a 3D skeleton with 21 parts. This model is used to generate synthetic depth images, that are used to train Random Decision Forests (RDF), which are used to assign each pixel to a hand part. Mean-shift method is used on the classification results and joint locations are estimated. The system can run in real time at 30 fps on Kinect depth images. We use this method and Support Vector Machines for classification and obtain 99.9% recognition rate on the American Sign Language (ASL) digit recognition problem.
Real-time 3D motion capture for the human hand opens many avenues for HCI. This work describes ou... more Real-time 3D motion capture for the human hand opens many avenues for HCI. This work describes our framework for fitting a 3D skeleton to the human hand using depth images. We represent a human hand by a 3D skeleton with 15 joints. Using this model, various synthetic depth images are generated. Random Decision Forests (RDF) are trained and used to assign each pixel to a hand part. A mean-shift method is used for estimating joint locations using pixel classification results. Our system runs in real time at 30 fps on Kinect depth images.
... Human Action Recognition in Videos Using Keypoint Tracking Yunus Emre Kara, Lale Akarun Bilgi... more ... Human Action Recognition in Videos Using Keypoint Tracking Yunus Emre Kara, Lale Akarun Bilgisayar Mühendisli˘gi Bölümü Bo˘gaziçi ¨Universitesi, ˙Istanbul yunus.kara@boun.edu.tr, akarun@boun.edu.tr ... 32-36 Vol.3, IEEE, 2004. [13] Alemdar HO, Kara YE, Ozen MO, et al. ...
... Lale Akarun Bo˘gaziçi University Computer Engineering Department, 34342, Istanbul, Turkey kes... more ... Lale Akarun Bo˘gaziçi University Computer Engineering Department, 34342, Istanbul, Turkey keskinc@cmpe.boun.edu.tr, {kiracmus, yunus.kara, akarun}@boun ... The authors detect hands by thresholding the depth data and use Chamfer distance to measure shape sim-ilarity. ...
Frontiers in Natural Product Chemistry, 2005
Abstract: All of the possible conduritol isomers have already been synthesized starting from comp... more Abstract: All of the possible conduritol isomers have already been synthesized starting from completely different materials and their biological importance studied. Conduritols are useful precursors in the preparation of cyclitols such as myo-inositols phosphates, and pseudo-sugars, ...
Organic Letters, 2006
[reaction: see text] A new and stereospecific synthesis for bis-endoperoxide has been developed s... more [reaction: see text] A new and stereospecific synthesis for bis-endoperoxide has been developed starting from tetrahydronaphthalene. Photooxygenation of tetrahydronaphthalene resulted in the formation of hydroperoxy-endoperoxide. The bromination reaction of hydroperoxy-endoperoxide gave bis-endoperoxide, whose exact configuration has been determined by X-ray analysis. The lowest-energy conformer of bis-endoperoxide is the boat-chair form.
Tetrahedron, 2003
... Yunus Kara a and Metin Balci Corresponding Author Contact Information , E-mail The Correspond... more ... Yunus Kara a and Metin Balci Corresponding Author Contact Information , E-mail The Corresponding Author , b. ... Abstract | PDF (323 K) | View Record in Scopus | Cited By in Scopus (21) T. Hudlicky, M. Mandel, J. Rouden, RS Lee, B. Bachmann, T. Dudding, KJ Yost and JS ...
Journal of Chemical Research-s, 2010
A Novel and Stereospecific Synthesis of Aminocyclitol: N-Tosyldihydroconduramine E2. -The title c... more A Novel and Stereospecific Synthesis of Aminocyclitol: N-Tosyldihydroconduramine E2. -The title compound (VIII) is stereospecifically synthesized using the Pd(0) catalyzed cyclization reaction of allylic cis-diol (X) as the key step. -(KELEBEKLI*, L.; CELIK, M.; KARA, Y.; J. Chem. Res. 34 (2010) 1, 54-56; Dep. Chem., Ordu Univ., Ordu, Turk.; Eng.) -A. Forchert 27-184
Tetrahedron, 2003
The electrophilic addition of bromine to an exocyclic diene, 5,6-dimethylenebicyclo[2.2.1]hept-2-... more The electrophilic addition of bromine to an exocyclic diene, 5,6-dimethylenebicyclo[2.2.1]hept-2-ene, in CCl 4 at 08C led to the formation of non-rearranged (73%) and rearranged products (27%). However, high temperature bromination of the exocyclic diene at 778C suppressed the formation of the rearranged products. Similarly, bromination of 9,10-dimethylenetricyclo[6.2.1.0 2,7 ]undeca-2,4,6-triene at 2108C gave only the exo-1,2-addition product. Bromination at þ58C resulted in the formation of a mixture consisting of exo-1,2-and 1,4addition products in a ratio of (1:4). High temperature bromination at 778C resulted in the formation of the endo-1,2-addition product. Furthermore, it has been shown that the 1,4-addition product converts smoothly to the 1,2-addition product. The formation mechanism of the products is discussed and supported by calculations. q
Beilstein Journal of Organic Chemistry, 2010
A new class of aminocyclitol derivatives with the bicyclo[4.2.0]octane skeleton was synthesized s... more A new class of aminocyclitol derivatives with the bicyclo[4.2.0]octane skeleton was synthesized starting from cyclooctatetraene. Photooxygenation of trans-7,8-diacetoxyand cis-7,8-dichlorobicyclo[4.2.0]octa-2,4-diene afforded the bicyclic endoperoxides. Reduction of the latter with thiourea followed by a Pd(0) catalyzed ionization/cyclization reaction gave the corresponding oxazolidinone derivatives. Oxidation of the double bond with KMnO 4 or OsO 4 followed by acetylation gave the acetate derivatives, the exact configuration of which was determined by spectroscopic methods. Hydrolysis of the oxazolidinone rings and removal of the acetate groups furnished the desired aminocyclitols.
Acta Crystallographica Section E-structure Reports Online, 2008
Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.063; wR... more Key indicators: single-crystal X-ray study; T = 293 K; mean (C-C) = 0.003 Å; R factor = 0.063; wR factor = 0.154; data-to-parameter ratio = 24.8.
Journal of Molecular Structure, 2011
Two new deoxycarbaheptopyranoses, 5a-carba-6-deoxy-a-DL-galacto-heptopyranose and 5a-carba-6deoxy... more Two new deoxycarbaheptopyranoses, 5a-carba-6-deoxy-a-DL-galacto-heptopyranose and 5a-carba-6deoxy-a-DL-gulo-heptopyranose were prepared starting from cyclohexa-1,4-diene. The addition of dichloroketene to cyclohexa-1,4-diene followed by the subsequent reductive elimination and Baeyere Villiger oxidation in turn led to the formation of a bicyclic lactone. Reduction of the lactone moiety followed by acetylation gave a diacetate with cis-configuration. The introduction of additional acetate functionality into the molecule was achieved by singlet oxygen ene-reaction. The formed hydroperoxide was reduced and then acetylated. The triacetate was further functionalized either by direct cishydroxylation using OsO 4 or by epoxidation followed by a ring-opening reaction to give the title heptopyranose derivatives. One of the synthesized molecules, galacto-heptopyranose exhibited enzyme specific inhibition against a-glycosidase. On the other hand, they did not show any inhibition for a-amylase. However, both compounds, gulo-heptopyranose and galacto-heptopyranose increased the activity of a-amylase. .tr (M. Balci). y Author to whom inquires concerning the X-ray structure should be directed.
Helvetica Chimica Acta, 2006
Acta Crystallographica Section E-structure Reports Online, 2007
Journal of Chemical Research-s, 1997
ABSTRACT
Carbohydrate Research, 2005
Bis-homoconduritol derivatives with conduritol-A, -D, and -F structures have been synthesized sta... more Bis-homoconduritol derivatives with conduritol-A, -D, and -F structures have been synthesized starting from cyclooctatetraene. The photooxygenation of trans-7,8-dibromo- and cis-7,8-dichlorobicyclo[4.2.0]octa-2,4-dienes afforded the bicyclic endoperoxides. Reduction of the endoperoxides with thiourea followed by acetylation gave the corresponding diacetates. The KMnO(4) oxidation and epoxidation of the diacetates followed by acetylation gave the tetraacetates. Removal of the halides either with zinc-dust or Na-anthracene followed by the ammonolysis of tetraacetates afforded the bis-homoconduritol derivatives in high yield.
Journal of Chemical Research-s, 2002
Syntheses of and Photochemical Studies of 2,3-Disubstituted 1,4-Epoxy-1,4-dihydronaphthalenes. -T... more Syntheses of and Photochemical Studies of 2,3-Disubstituted 1,4-Epoxy-1,4-dihydronaphthalenes. -The photolysis of the title compounds, e.g. (VIII), yields indene derivatives such as (IX) and (X) (no yields given) rather than the expected benz[f]oxepins. -(ALTUNDAS, A.; KARA*, Y.; SECEN, H.; AKBULUT, N.; J. Chem. Res. , Synop. 2002, 8, 361-362; Dep. Chem., Atatuerk Univ., TR-25240 Erzurum, Turk.; Eng.) -Schulze 04-108